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Watanabe K, Koch Esteves N, Gibson OR, Akiyama K, Watanabe S, González-Alonso J. Heat-related changes in the velocity and kinetic energy of flowing blood influence the human heart's output during hyperthermia. J Physiol 2024; 602:2227-2251. [PMID: 38690610 DOI: 10.1113/jp285760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 04/03/2024] [Indexed: 05/02/2024] Open
Abstract
Passive whole-body hyperthermia increases limb blood flow and cardiac output (Q ̇ $\dot Q$ ), but the interplay between peripheral and central thermo-haemodynamic mechanisms remains unclear. Here we tested the hypothesis that local hyperthermia-induced alterations in peripheral blood flow and blood kinetic energy modulate flow to the heart andQ ̇ $\dot Q$ . Body temperatures, regional (leg, arm, head) and systemic haemodynamics, and left ventricular (LV) volumes and functions were assessed in eight healthy males during: (1) 3 h control (normothermic condition); (2) 3 h of single-leg heating; (3) 3 h of two-leg heating; and (4) 2.5 h of whole-body heating. Leg, forearm, and extracranial blood flow increased in close association with local rises in temperature while brain perfusion remained unchanged. Increases in blood velocity with small to no changes in the conduit artery diameter underpinned the augmented limb and extracranial perfusion. In all heating conditions,Q ̇ $\dot Q$ increased in association with proportional elevations in systemic vascular conductance, related to enhanced blood flow, blood velocity, vascular conductance and kinetic energy in the limbs and head (all R2 ≥ 0.803; P < 0.001), but not in the brain. LV systolic (end-systolic elastance and twist) and diastolic functional profiles (untwisting rate), pulmonary ventilation and systemic aerobic metabolism were only altered in whole-body heating. These findings substantiate the idea that local hyperthermia-induced selective alterations in peripheral blood flow modulate the magnitude of flow to the heart andQ ̇ $\dot Q$ through changes in blood velocity and kinetic energy. Localised heat-activated events in the peripheral circulation therefore affect the human heart's output. KEY POINTS: Local and whole-body hyperthermia increases limb and systemic perfusion, but the underlying peripheral and central heat-sensitive mechanisms are not fully established. Here we investigated the regional (leg, arm and head) and systemic haemodynamics (cardiac output:Q ̇ $\dot Q$ ) during passive single-leg, two-leg and whole-body hyperthermia to determine the contribution of peripheral and central thermosensitive factors in the control of human circulation. Single-leg, two-leg, and whole-body hyperthermia induced graded increases in leg blood flow andQ ̇ $\dot Q$ . Brain blood flow, however, remained unchanged in all conditions. Ventilation, extracranial blood flow and cardiac systolic and diastolic functions only increased during whole-body hyperthermia. The augmentedQ ̇ $\dot Q$ with hyperthermia was tightly related to increased limb and head blood velocity, flow and kinetic energy. The findings indicate that local thermosensitive mechanisms modulate regional blood velocity, flow and kinetic energy, thereby controlling the magnitude of flow to the heart and thus the coupling of peripheral and central circulation during hyperthermia.
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Affiliation(s)
- Kazuhito Watanabe
- Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK
- Faculty of Education and Human Studies, Akita University, Akita, Japan
| | - Nuno Koch Esteves
- Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK
- Research Centre, University College of Osteopathy, London, UK
| | - Oliver R Gibson
- Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK
- Centre for Physical Activity in Health and Disease, Brunel University London, Uxbridge, UK
| | - Koichi Akiyama
- Department of Anesthesiology, Kindai University Hospital, Osaka, Japan
| | - Sumie Watanabe
- Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK
- Faculty of Education and Human Studies, Akita University, Akita, Japan
| | - José González-Alonso
- Division of Sport, Health and Exercise Sciences, Department of Life Sciences, Brunel University London, Uxbridge, UK
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Wong BJ, Turner CG, Hayat MJ, Otis JS, Quyyumi AA. Inhibition of superoxide and iNOS augment cutaneous nitric oxide-dependent vasodilation in non-Hispanic black young adults. Physiol Rep 2024; 12:e16021. [PMID: 38639714 PMCID: PMC11027894 DOI: 10.14814/phy2.16021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 04/04/2024] [Indexed: 04/20/2024] Open
Abstract
We assessed the combined effect of superoxide and iNOS inhibition on microvascular function in non-Hispanic Black and non-Hispanic White participants (n = 15 per group). Participants were instrumented with four microdialysis fibers: (1) lactated Ringer's (control), (2) 10 μM tempol (superoxide inhibition), (3) 0.1 mM 1400 W (iNOS inhibition), (4) tempol + 1400 W. Cutaneous vasodilation was induced via local heating and NO-dependent vasodilation was quantified. At control sites, NO-dependent vasodilation was lower in non-Hispanic Black (45 ± 9% NO) relative to non-Hispanic White (79 ± 9% NO; p < 0.01; effect size, d = 3.78) participants. Tempol (62 ± 16% NO), 1400 W (78 ± 12% NO) and tempol +1400 W (80 ± 13% NO) increased NO-dependent vasodilation in non-Hispanic Black participants relative to control sites (all p < 0.01; d = 1.22, 3.05, 3.03, respectively). The effect of 1400 W (p = 0.04, d = 1.11) and tempol +1400 W (p = 0.03, d = 1.22) was greater than tempol in non-Hispanic Black participants. There was no difference between non-Hispanic Black and non-Hispanic White participants at 1400 W or tempol + 1400 W sites. These data suggest iNOS has a greater effect on NO-dependent vasodilation than superoxide in non-Hispanic Black participants.
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Affiliation(s)
- Brett J. Wong
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGeorgiaUSA
| | - Casey G. Turner
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGeorgiaUSA
- Molecular Cardiology Research InstituteTufts Medical CenterBostonMassachusettsUSA
| | - Matthew J. Hayat
- Department of Population Health Sciences, School of Public HealthGeorgia State UniversityAtlantaGeorgiaUSA
| | - Jeffrey S. Otis
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGeorgiaUSA
| | - Arshed A. Quyyumi
- Emory Clinical Cardiology Research InstituteEmory University School of MedicineAtlantaGeorgiaUSA
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Devanne J, Dufour A, Després O, Pebayle T, Lithfous S. Interaction between local blood flow and tolerance to prolonged pain in the elderly. Eur J Appl Physiol 2024; 124:573-583. [PMID: 37650916 DOI: 10.1007/s00421-023-05294-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 08/05/2023] [Indexed: 09/01/2023]
Abstract
PURPOSE We aimed to explore the link between local vasodilation and pain perception in elderly subjects, testing the hypothesis that altered local cutaneous blood flow participates in the decrease in pain tolerance with age. METHOD Sixty-eight young and 83 older participants performed a pain tolerance test in which they hold their hand in an airtight box in which air temperature was regulated at 65 °C until the pain became unbearable. Participants continuously estimated pain intensity. Skin temperature and local blood flow in the box-exposed hand were continuously monitored. RESULTS In the young group, 97% of subjects resisted pain until the end of the test, whereas only 53% in the elderly group managed to do so, indicating that pain tolerance is impaired in the elderly. Among all participants, the skin temperature associated with the first pain sensation was below the threshold for nociceptor activation (43 °C). Interestingly, blood flow in the elderly group was correlated with pain judgment, whereas no such correlation was observed in the young. CONCLUSION Our results suggest that the local vasodilator response induced by local heating may be involved in pain perception and may influence thermal pain tolerance with aging. These results could contribute to a better understanding of vascular deficits and the development of chronic pain in vascular pathologies.
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Affiliation(s)
- Julia Devanne
- Laboratoire de Neurosciences Cognitives et Adaptatives, CNRS, UMR 7364, Université de Strasbourg, 12 Rue Goethe, 67000, Strasbourg, France.
| | - André Dufour
- Laboratoire de Neurosciences Cognitives et Adaptatives, CNRS, UMR 7364, Université de Strasbourg, 12 Rue Goethe, 67000, Strasbourg, France
- CNRS, UAR 3489, Université de Strasbourg, 67087, Strasbourg, France
| | - Olivier Després
- Laboratoire de Neurosciences Cognitives et Adaptatives, CNRS, UMR 7364, Université de Strasbourg, 12 Rue Goethe, 67000, Strasbourg, France
| | - Thierry Pebayle
- CNRS, UAR 3489, Université de Strasbourg, 67087, Strasbourg, France
| | - Ségolène Lithfous
- Laboratoire de Neurosciences Cognitives et Adaptatives, CNRS, UMR 7364, Université de Strasbourg, 12 Rue Goethe, 67000, Strasbourg, France
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Ma S. Stimuli-induced NOergic Molecules and Neuropeptides Mediated Axon Reflexes Contribute to Tracers along Meridian Pathways. Curr Top Med Chem 2024; 24:393-400. [PMID: 38243932 PMCID: PMC11111350 DOI: 10.2174/0115680266260220240108114337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/19/2023] [Accepted: 12/19/2023] [Indexed: 01/22/2024]
Abstract
An abundance of studies from different international groups have demonstrated tracers along linear pathways resembling meridians over the body surface of humans. All experiments of the studies have been conducted by injection of a radiotracer solution or tracer dyes in a volume of solution into acupuncture points (acupoints). The solution injected into acupoints produces much stronger mechanical stimuli than acupuncture, which causes axon reflex. Anatomical studies have demonstrated that acupoints/meridians exist higher number of small nerve fibers and blood vessels with rich nitric oxide (NO) and neuropeptides in the cutaneous tissues as structures for the biomolecules mediated axon reflexes. Recent advances have determined that NO and calcitonin generelated peptides play crucial roles in the comprehension of the axon reflex. The stimuli-evoked axon reflex and NOergic biomolecules/neuropeptides increase local blood flow with higher levels in acupoints/meridians, which move radioactive substances or tracer dyes in the skin and subcutaneous tissue under a linear path resembling acupoints and meridians, the important phenomena of meridians induced by the stimuli. The evidence and understanding of the biomolecular processes of the tracers along linear pathways resembling meridians have been summarized with an emphasis on recent developments of NO and neuropeptides mediating stimuli-evoked axon reflexes to increase local blood flow with higher levels in acupoints/meridians, which move radioactive substances or tracer dyes in the skin and subcutaneous tissue contributing to tracers along linear pathways resembling meridians in this mini-review.
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Affiliation(s)
- Shengxing Ma
- Department of Obstetrics and Gynecology, Lundquist Institute for Biomedical Innovation at Harbor-University of California at Los Angeles (UCLA) Medical Center, David Geffen School of Medicine at UCLA and Harbor-UCLA Medical Center, Torrance, CA 90502, United States
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Richey RE, Ruiz YI, Cope HL, Moore AM, Walsh MA, Garfield TC, Olivencia-Yurvati AH, Romero SA. Cyclooxygenase inhibition does not blunt thermal hyperemia in skeletal muscle of humans. J Appl Physiol (1985) 2024; 136:151-157. [PMID: 38059292 DOI: 10.1152/japplphysiol.00657.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/08/2023] Open
Abstract
Acute heat exposure increases skeletal muscle blood flow in humans. However, the mechanisms mediating this hyperemic response remain unknown. The cyclooxygenase pathway is active in skeletal muscle, is heat sensitive, and contributes to cutaneous thermal hyperemia in young healthy humans. Therefore, the purpose of this study was to test the hypothesis that cyclooxygenase inhibition would attenuate blood flow in the vastus lateralis muscle during localized heating. Twelve participants (6 women) were studied on two separate occasions: 1) time control (i.e., no ibuprofen); and 2) ingestion of 800 mg ibuprofen, a nonselective cyclooxygenase inhibitor. Experiments were randomized, counter-balanced, and separated by at least 10 days. Pulsed short-wave diathermy was used to induce unilateral deep heating of the vastus lateralis for 90 min, whereas the contralateral leg served as a thermoneutral control. Microdialysis was utilized to bypass the cutaneous circulation and directly measure local blood flow in the vastus lateralis muscle of each leg via the ethanol washout technique. Heat exposure increased muscle temperature and local blood flow (both P < 0.01 vs. baseline). However, the thermal hyperemic response did not differ between control and ibuprofen conditions (P ≥ 0.2). Muscle temperature slightly decreased for the thermoneutral leg (P < 0.01 vs. baseline), yet local blood flow remained relatively unchanged across time for control and ibuprofen conditions (both P ≥ 0.7). Taken together, our data suggest that inhibition of cyclooxygenase-derived vasodilator prostanoids does not blunt thermal hyperemia in skeletal muscle of young healthy humans.NEW & NOTEWORTHY Acute heat exposure increases skeletal muscle blood flow in humans. However, the mechanisms mediating this hyperemic response remain unknown. Using a pharmacological approach combined with microdialysis, we found that thermal hyperemia in the vastus lateralis muscle was well maintained despite the successful inhibition of cyclooxygenase. Our results suggest that cyclooxygenase-derived vasodilator prostanoids do not contribute to thermal hyperemia in skeletal muscle of young healthy humans.
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Affiliation(s)
- Rauchelle E Richey
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Ysabella I Ruiz
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Heidi L Cope
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Amy M Moore
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Mackenzie A Walsh
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Tyson C Garfield
- Department of Internal Medicine and Geriatrics, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Albert H Olivencia-Yurvati
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
- Department of Surgery, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Steven A Romero
- Department of Physiology and Anatomy, Human Vascular Physiology Laboratory, University of North Texas Health Science Center, Fort Worth, Texas, United States
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Smeele HP, Martin L, van Kuijk SMJ, Zwanenburg PR, van der Hulst RRWJ, Tuinder SMH, Fromy B. Local heating-induced cutaneous vasodilation in reinnervated and noninnervated deep inferior epigastric perforator flaps. Microsurgery 2024; 44:e31122. [PMID: 37788020 DOI: 10.1002/micr.31122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 09/06/2023] [Accepted: 09/22/2023] [Indexed: 10/04/2023]
Abstract
INTRODUCTION Cutaneous vascular reactivity to local heating in free flaps has not been characterized. We aimed to assess local heating-induced cutaneous vasodilation in reinnervated and noninnervated deep inferior epigastric perforator (DIEP) flaps. METHODS We conducted a cross-sectional study of 21 female patients with an uncomplicated unilateral delayed DIEP breast reconstruction at least 2 years after surgery. DIEP flaps and contralateral breasts were subjected to direct local heating, and skin blood flow was assessed using laser-Doppler flowmetry. To evaluate sensory-nerve-fiber function, touch perception thresholds were assessed using a 20-piece Touch-test™ Sensory Evaluator, and cutaneous warm detection and heat pain thresholds were measured using a TSA-II device. RESULTS Of the participants, 10 had a reinnervated DIEP flap with a single coapted nerve (mean flap weight, 610 ± 296 g) and 11 had a noninnervated DIEP flap (mean flap weight, 613 ± 169 g). Mean age was 58 ± 11 years, mean follow-up time was 5 ± 1 years, and mean BMI was 24 ± 3 kg/m2 . DIEP flaps exhibited significantly weaker cutaneous vasodilation in response to local heating than contralateral breasts (median peak skin blood flow, 59 [25th-75th percentile, 36-71] a.u. for DIEP flaps versus 94 [74-141] a.u. for contralateral breasts; p < .001). The magnitude of the response was similar between reinnervated and noninnervated flaps (median peak skin blood flow, 55 [25th-75th percentile, 39-68] a.u. for reinnervated DIEP flaps versus 66 [36-77] a.u. for noninnervated DIEP flaps; p = .75). Of participants with reinnervated DIEP flaps, 90% perceived heat pain below the 50°C safety threshold, as compared to 36% of participants with noninnervated DIEP flaps (two-tailed p = .02). CONCLUSION Our results suggest that free flap transfer causes longstanding impairment, yet not complete abolition, of both the sensory nerve-mediated and nitric oxide-dependent local heating-induced cutaneous vasodilatory systems. We found no statistical evidence that flap reinnervation improves the ability to raise skin blood flow in response to local heating.
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Affiliation(s)
- Hansje P Smeele
- Department of Plastic, Reconstructive and Hand Surgery, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Lisa Martin
- Functional Integrity of the Skin Group, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), CNRS UMR5305, Université Lyon 1, Lyon, France
| | - Sander M J van Kuijk
- Department of Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Pieter R Zwanenburg
- Department of Surgery, Amsterdam Gastroenterology and Metabolism, Amsterdam Infection & Immunity, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - René R W J van der Hulst
- Department of Plastic, Reconstructive and Hand Surgery, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Stefania M H Tuinder
- Department of Plastic, Reconstructive and Hand Surgery, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Bérengère Fromy
- Functional Integrity of the Skin Group, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), CNRS UMR5305, Université Lyon 1, Lyon, France
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Notley SR, Mitchell D, Taylor NAS. A century of exercise physiology: concepts that ignited the study of human thermoregulation. Part 3: Heat and cold tolerance during exercise. Eur J Appl Physiol 2024; 124:1-145. [PMID: 37796292 DOI: 10.1007/s00421-023-05276-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 07/04/2023] [Indexed: 10/06/2023]
Abstract
In this third installment of our four-part historical series, we evaluate contributions that shaped our understanding of heat and cold stress during occupational and athletic pursuits. Our first topic concerns how we tolerate, and sometimes fail to tolerate, exercise-heat stress. By 1900, physical activity with clothing- and climate-induced evaporative impediments led to an extraordinarily high incidence of heat stroke within the military. Fortunately, deep-body temperatures > 40 °C were not always fatal. Thirty years later, water immersion and patient treatments mimicking sweat evaporation were found to be effective, with the adage of cool first, transport later being adopted. We gradually acquired an understanding of thermoeffector function during heat storage, and learned about challenges to other regulatory mechanisms. In our second topic, we explore cold tolerance and intolerance. By the 1930s, hypothermia was known to reduce cutaneous circulation, particularly at the extremities, conserving body heat. Cold-induced vasodilatation hindered heat conservation, but it was protective. Increased metabolic heat production followed, driven by shivering and non-shivering thermogenesis, even during exercise and work. Physical endurance and shivering could both be compromised by hypoglycaemia. Later, treatments for hypothermia and cold injuries were refined, and the thermal after-drop was explained. In our final topic, we critique the numerous indices developed in attempts to numerically rate hot and cold stresses. The criteria for an effective thermal stress index were established by the 1930s. However, few indices satisfied those requirements, either then or now, and the surviving indices, including the unvalidated Wet-Bulb Globe-Thermometer index, do not fully predict thermal strain.
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Affiliation(s)
- Sean R Notley
- Defence Science and Technology Group, Department of Defence, Melbourne, Australia
- School of Human Kinetics, University of Ottawa, Ottawa, Canada
| | - Duncan Mitchell
- Brain Function Research Group, School of Physiology, University of the Witwatersrand, Johannesburg, South Africa
- School of Human Sciences, University of Western Australia, Crawley, Australia
| | - Nigel A S Taylor
- Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea.
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Hammond ST, Baumfalk DR, Parr SK, Butenas AL, Scheuermann BC, Turpin VRG, Behnke BJ, Hashmi MH, Ade CJ. Impaired microvascular reactivity in patients treated with 5-fluorouracil chemotherapy regimens: Potential role of endothelial dysfunction. IJC HEART & VASCULATURE 2023; 49:101300. [PMID: 38173789 PMCID: PMC10761309 DOI: 10.1016/j.ijcha.2023.101300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/27/2023] [Accepted: 11/06/2023] [Indexed: 01/05/2024]
Abstract
Background 5-fluorouracil (5-FU) is the second most common cancer chemotherapy associated with short- and long-term cardiotoxicity. Although the mechanisms mediating these toxicities are not well understood, patients often present with symptoms suggestive of microvascular dysfunction. We tested the hypotheses that patients undergoing cancer treatment with 5-FU based chemotherapy regimens would present with impaired microvascular reactivity and that these findings would be substantiated by decrements in endothelial nitric oxide synthase (eNOS) gene expression in 5-FU treated human coronary artery endothelial cells (HCAEC). Methods We first performed a cross-sectional analysis of 30 patients undergoing 5-FU based chemotherapy treatment for cancer (5-FU) and 32 controls (CON) matched for age, sex, body mass index, and prior health history (excluding cancer). Cutaneous microvascular reactivity was evaluated by laser Doppler flowmetry in response to endothelium-dependent (local skin heating; acetylcholine iontophoresis, ACh) and -independent (sodium nitroprusside iontophoresis, SNP) stimuli. In vitro experiments in HCAEC were completed to assess the effects of 5-FU on eNOS gene expression. Results 5-FU presented with diminished microvascular reactivity following eNOS-dependent local heating compared to CON (P = 0.001). Iontophoresis of the eNOS inhibitor L-NAME failed to alter the heating response in 5-FU (P = 0.95), despite significant reductions in CON (P = 0.03). These findings were corroborated by lower eNOS gene expression in 5-FU treated HCAEC (P < 0.01) compared to control. Peak vasodilation to ACh (P = 0.58) nor SNP (P = 0.39) were different between groups. Conclusions The present findings suggest diminished microvascular function along the eNOS-NO vasodilatory pathway in patients with cancer undergoing treatment with 5-FU-based chemotherapy regimens and thus, may provide insight into the underlying mechanisms of 5-FU cardiotoxicity.
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Affiliation(s)
- Stephen T. Hammond
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | | | - Shannon K. Parr
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | - Alec L.E. Butenas
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | | | | | - Bradley J. Behnke
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA
- Johnson Cancer Research Center, Kansas State University, Manhattan, KS, USA
| | | | - Carl J. Ade
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA
- Johnson Cancer Research Center, Kansas State University, Manhattan, KS, USA
- Physicians Associates Studies, Kansas State University, Manhattan, KS, USA
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Al-Hassany L, Linstra KM, Meun C, van den Berg J, Boersma E, Danser AHJ, Fauser BCJM, Laven JSE, Wermer MJH, Terwindt GM, Maassen Van Den Brink A. Decreased role of neuropeptides in the microvascular function in migraine patients with polycystic ovary syndrome. Atherosclerosis 2023; 384:117172. [PMID: 37400308 DOI: 10.1016/j.atherosclerosis.2023.06.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 06/13/2023] [Accepted: 06/15/2023] [Indexed: 07/05/2023]
Abstract
BACKGROUND AND AIMS To understand pathophysiological mechanisms underlying migraine as a cardiovascular risk factor, we studied neuropeptide action and endothelial function as measures of peripheral microvascular function in middle-aged women with or without migraine. METHODS We included women with the endocrine disorder polycystic ovary syndrome (PCOS), a population with supposed elevated cardiovascular risk, with and without comorbid migraine. In 26 women without and 23 women with migraine in the interictal phase (mean age 50.8 ± 2.9 years) local thermal hyperemia (LTH) of the skin of the volar forearm was measured cross-sectionally under control conditions, after inhibition of neuropeptide release by 5% lidocaine/prilocaine (EMLA) cream application, and after inhibition of nitric oxide formation by iontophoresis of NG-monomethyl-l-arginine (L-NMMA). Hereafter, changes in the natural logarithm of the reactive hyperemia index (lnRHI) and augmentation index (AI) during reperfusion after occlusion-derived ischemia were measured. RESULTS While mean values under control conditions and L-NMMA conditions were similar, migraine patients had a significantly higher mean area of the curve (AUC) of the total LTH response after EMLA application than those without (86.7 ± 26.5% versus 67.9 ± 24.2%; p = 0.014). This was also reflected by a higher median AUC of the plateau phase under similar conditions in women with migraine compared to those without (83.2% (IQR[73.2-109.5]) versus 73.2% (IQR[54.3-92.0]); p = 0.039). Mean changes in lnRHI and AI scores were similar in both groups. CONCLUSIONS In PCOS patients with migraine, neuropeptide action was lower compared with those without migraine. While larger studies are warranted, these findings provide a potential mechanism supporting previous findings that migraine may be independent from traditional risk factors, including atherosclerosis.
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Affiliation(s)
- Linda Al-Hassany
- Erasmus MC University Medical Center, Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Rotterdam, the Netherlands
| | - Katie M Linstra
- Erasmus MC University Medical Center, Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Rotterdam, the Netherlands; Leiden University Medical Center, Department of Neurology, Leiden, the Netherlands
| | - Cindy Meun
- Erasmus MC University Medical Center, Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynaecology, Rotterdam, the Netherlands
| | - Jeffrey van den Berg
- Erasmus MC University Medical Center, Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Rotterdam, the Netherlands
| | - Eric Boersma
- Erasmus MC University Medical Center Rotterdam, Department of Cardiology, the Netherlands
| | - A H Jan Danser
- Erasmus MC University Medical Center, Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Rotterdam, the Netherlands
| | - Bart C J M Fauser
- University Medical Center Utrecht, Department of Reproductive Medicine & Gynaecology, Utrecht, the Netherlands
| | - Joop S E Laven
- Erasmus MC University Medical Center, Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynaecology, Rotterdam, the Netherlands
| | - Marieke J H Wermer
- Leiden University Medical Center, Department of Neurology, Leiden, the Netherlands
| | - Gisela M Terwindt
- Leiden University Medical Center, Department of Neurology, Leiden, the Netherlands
| | - Antoinette Maassen Van Den Brink
- Erasmus MC University Medical Center, Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Rotterdam, the Netherlands.
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Stone JC, MacDonald MJ. The impacts of endogenous progesterone and exogenous progestin on vascular endothelial cell, and smooth muscle cell function: A narrative review. Vascul Pharmacol 2023; 152:107209. [PMID: 37591444 DOI: 10.1016/j.vph.2023.107209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/04/2023] [Accepted: 08/14/2023] [Indexed: 08/19/2023]
Abstract
Vascular endothelial and smooth muscle cell dysfunction proceed the development of numerous vascular diseases, such as atherosclerosis. Both estrogen and progesterone receptors are present on vascular endothelial and smooth muscle cells, and therefore it has been postulated that these compounds may affect vascular function. It has been well-established that estrogen is a vasoprotective compound, however, the effects of progesterone on vascular function are not well understood. This narrative review summarizes the current research investigating the impact of both endogenous progesterone, and exogenous synthetic progestin on vascular endothelial and smooth muscle cell function and identifies discrepancies on their effects in vitro and in vivo. We speculate that an inverted-U dose response curve may exist between nitric oxide bioavailability and progesterone concentration, and that the androgenic properties of a progestin may influence vascular function. Future research is needed to discern the effects of both endogenous progesterone and exogenous progestin on vascular endothelial and smooth muscle cell function with consideration for the impacts of progesterone/progestin dose, and progestin type.
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Affiliation(s)
- Jenna C Stone
- Vascular Dynamics Lab, Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Maureen J MacDonald
- Vascular Dynamics Lab, Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada.
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11
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Koch Esteves N, Khir AW, González‐Alonso J. Lower limb hyperthermia augments functional hyperaemia during small muscle mass exercise similarly in trained elderly and young humans. Exp Physiol 2023; 108:1154-1171. [PMID: 37409754 PMCID: PMC10988472 DOI: 10.1113/ep091275] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 06/23/2023] [Indexed: 07/07/2023]
Abstract
NEW FINDINGS What is the central question of the study? Ageing is postulated to lead to underperfusion of human limb tissues during passive and exertional hyperthermia, but findings to date have been equivocal. Thus, does age have an independent adverse effect on local haemodynamics during passive single-leg hyperthermia, single-leg knee-extensor exercise and their combination? What is the main finding and its importance? Local hyperthermia increased leg blood flow over three-fold and had an additive effect during knee-extensor exercise with no absolute differences in leg perfusion between the healthy, exercise-trained elderly and the young groups. Our findings indicate that age per se does not compromise lower limb hyperaemia during local hyperthermia and/or small muscle mass exercise. ABSTRACT Heat and exercise therapies are recommended to improve vascular health across the lifespan. However, the haemodynamic effects of hyperthermia, exercise and their combination are inconsistent in young and elderly people. Here we investigated the acute effects of local-limb hyperthermia and exercise on limb haemodynamics in nine healthy, trained elderly (69 ± 5 years) and 10 young (26 ± 7 years) adults, hypothesising that the combination of local hyperthermia and exercise interact to increase leg perfusion, albeit to a lesser extent in the elderly. Participants underwent 90 min of single whole-leg heating, with the contralateral leg remaining as control, followed by 10 min of low-intensity incremental single-leg knee-extensor exercise with both the heated and control legs. Temperature profiles and leg haemodynamics at the femoral and popliteal arteries were measured. In both groups, heating increased whole-leg skin temperature and blood flow by 9.5 ± 1.2°C and 0.7 ± 0.2 L min-1 (>3-fold), respectively (P < 0.0001). Blood flow in the heated leg remained 0.7 ± 0.6 and 1.0 ± 0.8 L min-1 higher during exercise at 6 and 12 W, respectively (P < 0.0001). However, there were no differences in limb haemodynamics between cohorts, other than the elderly group exhibiting a 16 ± 6% larger arterial diameter and a 51 ± 6% lower blood velocity following heating (P < 0.0001). In conclusion, local hyperthermia-induced limb hyperperfusion and/or small muscle mass exercise hyperaemia are preserved in trained older people despite evident age-related structural and functional alterations in their leg conduit arteries.
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Affiliation(s)
- Nuno Koch Esteves
- Division of Sport, Health, and Exercise Sciences, Department of Life SciencesBrunel University LondonUxbridgeUK
| | | | - José González‐Alonso
- Division of Sport, Health, and Exercise Sciences, Department of Life SciencesBrunel University LondonUxbridgeUK
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12
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Marcinkevics Z, Rubins U, Aglinska A, Logina I, Glazunovs D, Grabovskis A. Contactless photoplethysmography for assessment of small fiber neuropathy. Front Physiol 2023; 14:1180288. [PMID: 37727661 PMCID: PMC10505793 DOI: 10.3389/fphys.2023.1180288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 08/02/2023] [Indexed: 09/21/2023] Open
Abstract
Chronic pain is a prevalent condition affecting approximately one-fifth of the global population, with significant impacts on quality of life and work productivity. Small fiber neuropathies are a common cause of chronic pain, and current diagnostic methods rely on subjective self-assessment or invasive skin biopsies, highlighting the need for objective noninvasive assessment methods. The study aims to develop a modular prototype of a contactless photoplethysmography system with three spectral bands (420, 540, and 800 nm) and evaluate its potential for assessing peripheral neuropathy patients via a skin topical heating test and spectral analyses of cutaneous flowmotions. The foot topical skin heating test was conducted on thirty volunteers, including fifteen healthy subjects and fifteen neuropathic patients. Four cutaneous nerve fiber characterizing parameters were evaluated at different wavelengths, including vasomotor response trend, flare area, flare intensity index, and the spectral power of cutaneous flowmotions. The results show that neuropathic patients had significantly lower vasomotor response (50%), flare area (63%), flare intensity index (19%), and neurogenic component (54%) of cutaneous flowmotions compared to the control group, independent of photoplethysmography spectral band. An absolute value of perfusion was 20%-30% higher in the 420 nm band. Imaging photoplethysmography shows potential as a cost-effective alternative for objective and non-invasive assessment of neuropathic patients, but further research is needed to enhance photoplethysmography signal quality and establish diagnostic criteria.
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Affiliation(s)
- Zbignevs Marcinkevics
- Department of Human and Animal Physiology, Faculty of Biology, University of Latvia, Riga, Latvia
- Biophotonics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia
| | - Uldis Rubins
- Biophotonics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia
| | - Alise Aglinska
- Department of Human and Animal Physiology, Faculty of Biology, University of Latvia, Riga, Latvia
| | - Inara Logina
- Department of Neurology and Neurosurgery, Riga Stradins University, Riga, Latvia
| | - Dmitrijs Glazunovs
- Department of Neurology and Neurosurgery, Riga Stradins University, Riga, Latvia
| | - Andris Grabovskis
- Biophotonics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia
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Turner CG, Hayat MJ, Grosch C, Quyyumi AA, Otis JS, Wong BJ. Endothelin A receptor inhibition increases nitric oxide-dependent vasodilation independent of superoxide in non-Hispanic Black young adults. J Appl Physiol (1985) 2023; 134:891-899. [PMID: 36892887 PMCID: PMC10042601 DOI: 10.1152/japplphysiol.00739.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023] Open
Abstract
Young non-Hispanic Black adults have reduced microvascular endothelial function compared with non-Hispanic White counterparts, but the mechanisms are not fully elucidated. The purpose of this study was to investigate the effect of endothelin-1 A receptor (ETAR) and superoxide on cutaneous microvascular function in young non-Hispanic Black (n = 10) and White (n = 10) adults. Participants were instrumented with four intradermal microdialysis fibers: 1) lactated Ringer's (control), 2) 500 nM BQ-123 (ETAR antagonist), 3) 10 μM tempol (superoxide dismutase mimetic), and 4) BQ-123 + tempol. Skin blood flow was assessed via laser-Doppler flowmetry (LDF), and each site underwent rapid local heating from 33°C to 39°C. At the plateau of local heating, 20 mM l-NAME [nitric oxide (NO) synthase inhibitor] was infused to quantify NO-dependent vasodilation. Data are means ± standard deviation. NO-dependent vasodilation was decreased in non-Hispanic Black compared with non-Hispanic White young adults (P < 0.01). NO-dependent vasodilation was increased at BQ-123 sites (73 ± 10% NO) and at BQ-123 + tempol sites (71 ± 10%NO) in non-Hispanic Black young adults compared with control (53 ± 13%NO, P = 0.01). Tempol alone had no effect on NO-dependent vasodilation in non-Hispanic Black young adults (63 ± 14%NO, P = 0.18). NO-dependent vasodilation at BQ-123 sites was not statistically different between non-Hispanic Black and White (80 ± 7%NO) young adults (P = 0.15). ETAR contributes to reduced NO-dependent vasodilation in non-Hispanic Black young adults independent of superoxide, suggesting a greater effect on NO synthesis rather than NO scavenging via superoxide.NEW & NOTEWORTHY Endothelin-1 A receptors (ETARs) have been shown to reduce endothelial function independently and through increased production of superoxide. We show that independent ETAR inhibition increases microvascular endothelial function in non-Hispanic Black young adults. However, administration of a superoxide dismutase mimetic alone and in combination with ETAR inhibition had no effect on microvascular endothelial function suggesting that, in the cutaneous microvasculature, the negative effects of ETAR in non-Hispanic Black young adults are independent of superoxide production.
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Affiliation(s)
- Casey G Turner
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia, United States
| | - Matthew J Hayat
- Department of Population Health Sciences, School of Public Health, Georgia State University, Atlanta, Georgia, United States
| | - Caroline Grosch
- Department of Population Health Sciences, School of Public Health, Georgia State University, Atlanta, Georgia, United States
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, Emory University School of Medicine, Atlanta, Georgia, United States
| | - Jeffrey S Otis
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia, United States
| | - Brett J Wong
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia, United States
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Yasukochi Y, Sera T, Kohno T, Nakashima Y, Uesugi M, Kudo S. Cold-induced vasodilation response in a Japanese cohort: insights from cold-water immersion and genome-wide association studies. J Physiol Anthropol 2023; 42:2. [PMID: 36890596 PMCID: PMC9993636 DOI: 10.1186/s40101-023-00319-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 02/10/2023] [Indexed: 03/10/2023] Open
Abstract
BACKGROUND Cold-induced vasodilation (CIVD) occurs after blood vessels in the skin are constricted due to local cold exposure. Although many CIVD studies have been conducted, the underlying molecular mechanisms are yet to be clarified. Therefore, we explored genetic variants associated with CIVD response using the largest-scale dataset reported to date in a CIVD study involving wavelet analysis; thus, the findings improve our understanding of the molecular mechanisms that regulate the CIVD response. METHODS We performed wavelet analysis of three skin blood flow signals [endothelial nitric oxide (eNO)-independent, eNO-dependent, and neurogenic activities] during finger cold-water immersion at 5 °C in 94 Japanese young adults. Additionally, we conducted genome-wide association studies of CIVD using saliva samples collected from the participants. RESULTS We found that the mean wavelet amplitudes of eNO-independent and neurogenic activities significantly increased and decreased prior to CIVD, respectively. Our results also implied that as many as ~ 10% of the Japanese subjects did not show an apparent CIVD response. Our genome-wide association studies of CIVD using ~ 4,040,000 imputed data found no apparent CIVD-related genetic variants; however, we identified 10 genetic variants, including 2 functional genes (COL4A2 and PRLR) that are associated with notable blunted eNO-independent and neurogenic activity responses in individuals without CIVD response during local cold exposure. CONCLUSIONS Our findings indicate that individuals without CIVD response differentiated by genotypes with COL4A2 and PRLR genetic variants exhibited notable blunted eNO-independent and neurogenic activity responses during local cold exposure.
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Affiliation(s)
- Yoshiki Yasukochi
- Department of Genome Analysis, Institute of Biomedical Science, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan.
| | - Toshihiro Sera
- Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Taiki Kohno
- Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Yusuke Nakashima
- Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Musashi Uesugi
- Graduate School of Systems Life Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Susumu Kudo
- Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan.
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Eglin CM, Wright J, Maley MJ, Hollis S, Massey H, Montgomery H, Tipton MJ. The peripheral vascular responses in non-freezing cold injury and matched controls. Exp Physiol 2023; 108:420-437. [PMID: 36807667 PMCID: PMC10103892 DOI: 10.1113/ep090721] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 01/20/2023] [Indexed: 02/22/2023]
Abstract
NEW FINDINGS What is the central question of this study? Does non-freezing cold injury (NFCI) alter normal peripheral vascular function? What is the main finding and its importance? Individuals with NFCI were more cold sensitive (rewarmed more slowly and felt more discomfort) than controls. Vascular tests indicated that extremity endothelial function was preserved with NFCI and that sympathetic vasoconstrictor response might be reduced. The pathophysiology underpinning the cold sensitivity associated with NFCI thus remains to be identified. ABSTRACT The impact of non-freezing cold injury (NFCI) on peripheral vascular function was investigated. Individuals with NFCI (NFCI group) and closely matched controls with either similar (COLD group) or limited (CON group) previous cold exposure were compared (n = 16). Peripheral cutaneous vascular responses to deep inspiration (DI), occlusion (PORH), local cutaneous heating (LH) and iontophoresis of acetylcholine and sodium nitroprusside were investigated. The responses to a cold sensitivity test (CST) involving immersion of a foot in 15°C water for 2 min followed by spontaneous rewarming, and a foot cooling protocol (footplate cooled from 34°C to 15°C), were also examined. The vasoconstrictor response to DI was lower in NFCI compared to CON (toe: 73 (28)% vs. 91 (17)%; P = 0.003). The responses to PORH, LH and iontophoresis were not reduced compared to either COLD or CON. During the CST, toe skin temperature rewarmed more slowly in NFCI than COLD or CON (10 min: 27.4 (2.3)°C vs. 30.7 (3.7)°C and 31.7 (3.9)°C, P < 0.05, respectively); however, no differences were observed during the footplate cooling. NFCI were more cold-intolerant (P < 0.0001) and reported colder and more uncomfortable feet during the CST and footplate cooling than COLD and CON (P < 0.05). NFCI showed a decreased sensitivity to sympathetic vasoconstrictor activation than CON and greater cold sensitivity (CST) compared to COLD and CON. None of the other vascular function tests indicated endothelial dysfunction. However, NFCI perceived their extremities to be colder and more uncomfortable/painful than the controls.
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Affiliation(s)
- Clare M. Eglin
- Extreme Environments Laboratory, School of Sport, Health and Exercise ScienceUniversity of PortsmouthPortsmouthUK
| | - Jennifer Wright
- Extreme Environments Laboratory, School of Sport, Health and Exercise ScienceUniversity of PortsmouthPortsmouthUK
| | - Matthew J. Maley
- Environmental Ergonomics Research Centre, Loughborough School of Design and Creative ArtsLoughborough UniversityLoughboroughUK
| | - Sarah Hollis
- Regional Occupational Health Team (ROHT) CatterickCatterick GarrisonUK
| | - Heather Massey
- Extreme Environments Laboratory, School of Sport, Health and Exercise ScienceUniversity of PortsmouthPortsmouthUK
| | | | - Michael J. Tipton
- Extreme Environments Laboratory, School of Sport, Health and Exercise ScienceUniversity of PortsmouthPortsmouthUK
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Chou AK, Chen YW. N(Omega)-nitro-l-arginine methyl ester potentiates lidocaine analgesic and anaesthetic effect in rats. J Pharm Pharmacol 2023; 75:98-104. [PMID: 36367368 DOI: 10.1093/jpp/rgac082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 10/04/2022] [Indexed: 11/12/2022]
Abstract
OBJECTIVES The purpose of the experiment was to study the effect of L-NAME (N(Omega)-nitro-L-arginine methyl ester) and its cotreatment with lidocaine on the spinal block and infiltrative cutaneous analgesia. METHODS The quality of cutaneous analgesia was examined by the block of the cutaneous trunci muscle reflexes following needle stimuli in the rat. Spinal anaesthetic potency was assessed by measuring three neurobehavioral examinations of nociceptive, proprioceptive and motor function following intrathecal injection in the rat. KEY FINDINGS L-NAME (0.6, 6 and 60 nmol) when cotreatment with lidocaine (ED50) produced dose-related cutaneous analgesia. Coadministration of L-NAME (0.6 μmol) with lidocaine intensified (P < 0.01) and prolonged (P < 0.001) cutaneous analgesia, whereas subcutaneous L-NAME (0.6 μmol) and saline did not provoke cutaneous analgesic effects. Adding L-NAME (2.5 μmol) to lidocaine intrathecally prolonged spinal sensory and motor block (P < 0.01), while intrathecal L-NAME (2.5 μmol) or 5% dextrose (vehicle) produced no spinal block. CONCLUSIONS L-NAME at 60 nmol (the minimum effective dose) increases and prolongs the effect of cutaneous analgesia of lidocaine. L-NANE at an ineffective dose potentiates lidocaine analgesic and anaesthetic effects.
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Affiliation(s)
- An-Kuo Chou
- Department of Anesthesiology, China Medical University Hospital, Taichung, Taiwan.,School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan
| | - Yu-Wen Chen
- Department of Physical Therapy, College of Health Care, China Medical University, Taichung, Taiwan
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Contreras R, Hernández G, Valenzuela ED, González C, Ulloa R, Soto D, Castro R, Guzmán C, Oviedo V, Alegría L, Vidal D, Morales S, Ospina-Tascón GA, Bakker J, Kattan E. Exploring the relationship between capillary refill time, skin blood flow and microcirculatory reactivity during early resuscitation of patients with septic shock: a pilot study. J Clin Monit Comput 2022; 37:839-845. [PMID: 36495360 DOI: 10.1007/s10877-022-00946-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 11/08/2022] [Indexed: 12/14/2022]
Abstract
Capillary refill time (CRT), a costless and widely available tool, has emerged as a promising target to guide septic shock resuscitation. However, it has yet to gain universal acceptance due to its potential inter-observer variability. Standardization of CRT assessment may minimize this problem, but few studies have compared this approach with techniques that directly assess skin blood flow (SBF). Our objective was to determine if an abnormal CRT is associated with impaired SBF and microvascular reactivity in early septic shock patients. Twelve septic shock patients were subjected to multimodal perfusion and hemodynamic monitoring for 24 h. Three time-points (0, 1, and 24 h) were registered for each patient. SBF was measured by laser doppler. We performed a baseline SBF measurement and two microvascular reactivity tests: one with a thermal challenge at 44 °C and other with a vascular occlusion test. Ten healthy volunteers were evaluated to obtain reference values. The patients (median age 70 years) exhibited a 28-day mortality of 50%. Baseline CRT was 3.3 [2.7-7.3] seconds. In pooled data analysis, abnormal CRT presented a significantly lower SBF when compared to normal CRT [44 (13.3-80.3) vs 193.2 (99.4-285) APU, p = 0.0001]. CRT was strongly associated with SBF (R2 0.76, p < 0.0001). An abnormal CRT also was associated with impaired thermal challenge and vascular occlusion tests. Abnormal CRT values observed during early septic shock resuscitation are associated with impaired skin blood flow, and abnormal skin microvascular reactivity. Future studies should confirm these results.
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Seabra AB, Pieretti JC, de Melo Santana B, Horue M, Tortella GR, Castro GR. Pharmacological applications of nitric oxide-releasing biomaterials in human skin. Int J Pharm 2022; 630:122465. [PMID: 36476664 DOI: 10.1016/j.ijpharm.2022.122465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/24/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Nitric oxide (NO) is an important endogenous molecule that plays several roles in biological systems. NO is synthesized in human skin by three isoforms of nitric oxide synthase (NOS) and, depending on the produced NO concentration, it can actuate in wound healing, dermal vasodilation, or skin defense against different pathogens, for example. Besides being endogenously produced, NO-based pharmacological formulations have been developed for dermatological applications targeting diverse pathologies such as bacterial infection, wound healing, leishmaniasis, and even esthetic issues such as acne and skin aging. Recent strategies focus mainly on developing smart NO-releasing nanomaterials/biomaterials, as they enable a sustained and targeted NO release, promoting an improved therapeutic effect. This review aims to overview and discuss the main mechanisms of NO in human skin, the recent progress in the field of dermatological formulations containing NO, and their application in several skin diseases, highlighting promising advances and future perspectives in the field.
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Affiliation(s)
- Amedea B Seabra
- Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), Santo André, SP, Brazil.
| | - Joana C Pieretti
- Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), Santo André, SP, Brazil
| | - Bianca de Melo Santana
- Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), Santo André, SP, Brazil
| | - Manuel Horue
- Laboratorio de Nanobiomateriales, CINDEFI - Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET (CCT La Plata), Argentina
| | - Gonzalo R Tortella
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile; Centro de Excelencia en Investigación Biotecnologica Aplicada al Medio Ambiente (CIBAMA-BIOREN), Universidad de La Frontera, Temuco, Chile
| | - Guillermo R Castro
- Nanobiotechnology Area, Max Planck Laboratory for Structural Biology, Chemistry and Molecular Biophysics of Rosario (MPLbioR, UNR-MPIbpC). Partner Laboratory of the Max Planck Institute for Biophysical Chemistry (MPIbpC, MPG) - CONICET. Maipú 1065, S2000 Rosario, Santa Fe, Argentina; Nanomedicine Research Unit (Nanomed), Center for Natural and Human Sciences (CCNH), Universidade Federal do ABC (UFABC), Santo André, SP, Brazil.
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Stanhewicz AE, Schlarmann RL, Brustkern KM, Jalal D. Oxidative stress contributes to reductions in microvascular endothelial- and nitric oxide-dependent dilation in women with a history of gestational diabetes. J Appl Physiol (1985) 2022; 133:361-370. [PMID: 35796611 PMCID: PMC9359638 DOI: 10.1152/japplphysiol.00189.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Women with a history of gestational diabetes mellitus (GDM) are twice as likely to develop cardiovascular disease and ~7x as likely to develop type II diabetes as their age-matched counterparts. However, the mechanism(s) mediating these associations remain unclear. We hypothesized that endothelium- and NO-dependent dilation would be attenuated through oxidant stress mechanisms in the microvasculature of women with a history of GDM compared to control women with a history of uncomplicated pregnancy (HC). Ten HC (35±4yrs) and 10 GDM (34±4yrs) underwent a standard local heating protocol (42°C; 0.1°C·s-1). Two intradermal microdialysis fibers were placed in the ventral forearm for local delivery of lactated Ringer's (control), or 5mM L-ascorbate. After full expression of the local heating response, 15mM NG-nitro-L-arginine methyl ester NO synthase-inhibition) was perfused. Red cell flux was measured continuously by laser-Doppler flowmetry and cutaneous vascular conductance (CVC=flux/MAP) was standardized to maximum (%CVCmax; 28mM SNP + 43°C). Urine albumin:creatinine ratio (ACR) was measured. GDM had attenuated endothelium-dependent (GDM: 67±7 vs. HC: 90±4%CVCmax; p<0.001) and NO-dependent (GDM: 54±7 vs. HC: 71±3%; p=0.001) dilation at the control site and tended to have higher urine ACR (p=0.06). Both endothelium-dependent (r2=0.53, p=0.02) and NO-dependent (r2=0.56, p=0.01) dilation were related to urine ACR in GDM. L-ascorbate perfusion improved endothelium-dependent (82±5%CVCmax; p=0.03 vs. control) and NO-dependent (68±5%; p=0.02 vs. control) dilation in GDM but had no effect in HC (p>0.05). Otherwise healthy women with a history of GDM have attenuated microvascular endothelial function and this dysfunction is mediated, in part, by oxidative stress.
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Affiliation(s)
- Anna E Stanhewicz
- Department of Health and Human Physiology, The University of Iowa, Iowa City, Iowa, United States
| | - Rowan L Schlarmann
- Department of Health and Human Physiology, The University of Iowa, Iowa City, Iowa, United States
| | - Kaila M Brustkern
- Department of Health and Human Physiology, The University of Iowa, Iowa City, Iowa, United States
| | - Diana Jalal
- The Iowa City VA HCS, Iowa City, IA, United States.,Department of Internal Medicine, Carver College of Medicine, Iowa City, IA, United States
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20
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Skin Blood Flow Responses to Acetylcholine, Local Heating, and to 60% VO2max exercise with and without Nitric Oxide inhibition, in Boys vs. Girls. Pediatr Exerc Sci 2022; 31:67-75. [PMID: 34902840 DOI: 10.1123/pes.2021-0121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 09/08/2021] [Accepted: 10/11/2021] [Indexed: 11/18/2022]
Abstract
PURPOSE To determine sex-related differences in the skin blood flow (SkBF) response to exercise, local heating, and acetylcholine (ACh) in children, and to assess nitric oxide contribution to the SkBF response. METHODS Forearm SkBF during local heating (44°C), ACh iontophoresis, and exercise (30-min cycling and 60% of maximum oxygen consumption) was assessed, using laser Doppler fluxmetry, in 12 boys and 12 girls (7-13 y old), with and without nitric oxide synthase inhibition, using Nω-nitro-L-arginine methyl ester iontophoresis. RESULTS Local-heating-induced and ACh-induced SkBF increase were not different between boys and girls (local heating: 1445% [900%] and 1432% [582%] of baseline, P = .57; ACh: 673% [434%] and 558% [405%] of baseline, respectively, P = .18). Exercise-induced increase in SkBF was greater in boys than girls (528% [290%] and 374% [192%] of baseline, respectively, P = .03). Nω-nitro-L-arginine methyl ester blunted the SkBF response to ACh and during exercise (P < .001), with no difference between sexes. CONCLUSION SkBF responses to ACh and local heat stimuli were similar in boys and girls, while the increase in SkBF during exercise was greater in boys. The apparent role of nitric oxide was not different between boys and girls. It is suggested that the greater SkBF response in boys during exercise was related to greater relative heat production and dissipation needs at this exercise intensity. The response to body size-related workload should be further examined.
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Kim J, Franke WD, Lang JA. Delayed Cutaneous Microvascular Responses With Non-consecutive 3 Days of Remote Ischemic Preconditioning. Front Physiol 2022; 13:852966. [PMID: 35360244 PMCID: PMC8964107 DOI: 10.3389/fphys.2022.852966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 02/15/2022] [Indexed: 12/19/2022] Open
Abstract
The optimal frequency and duration of remote ischemic preconditioning (RIPC) that augments microvascular function is unknown. A single bout of RIPC increases cutaneous endothelial function for ∼48 h, whereas 1 week of daily RIPC bouts improves more sustained endothelium-independent function. We hypothesized that 3 days of RIPC separated by rest days (3QOD RIPC) would result in sustained increases in both endothelium-dependent and endothelium-independent functions. Cutaneous microvascular function was assessed in 13 healthy young participants (aged 20.5 ± 3.9 years; 5 males, 8 females) before 3QOD and then 24, 48, and 72 h and a week after 3QOD. RIPC consisted of four repetitions of 5 min of blood flow occlusion separated by 5 min of reperfusion. Skin blood flow responses to local heating (Tloc = 42°C), acetylcholine (Ach), and sodium nitroprusside (SNP) were measured using laser speckle contrast imaging and expressed as cutaneous vascular conductance (CVC = PU⋅mmHg–1). Local heating-mediated vasodilation was increased 72 h after 3QOD and the increased responsivity persisted a week later (1.08 ± 0.24 vs. 1.34 ± 0.46, 1.21 ± 0.36 PU⋅mmHg–1; ΔCVC, pre-RIPC vs. 72 h, a week after 3QOD; P = 0.054). Ach-induced cutaneous vasodilation increased a week after 3QOD (0.73 ± 0.41 vs. 0.95 ± 0.49 PU⋅mmHg–1; ΔCVC, pre-RIPC vs. a week after 3QOD; P < 0.05). SNP-induced cutaneous vasodilation increased 24 h after 3QOD (0.47 ± 0.28 vs. 0.63 ± 0.35 PU⋅mmHg–1; ΔCVC, pre-RIPC vs. 24 h; P < 0.05), but this change did not persist thereafter. Thus, 3QOD induced sustained improvement in endothelium-dependent vasodilation but was not sufficient to sustain increases in endothelium-independent vasodilation.
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Affiliation(s)
- Jahyun Kim
- Department of Kinesiology, California State University, Bakersfield, Bakersfield, CA, United States
| | - Warren D. Franke
- Department of Kinesiology, Iowa State University, Ames, IA, United States
| | - James A. Lang
- Department of Kinesiology, Iowa State University, Ames, IA, United States
- *Correspondence: James A. Lang,
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22
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Lima NS, Lefferts EC, Clifford PS. Reactive hyperemia augments local heat-induced skin hyperemia. Exp Physiol 2022; 107:383-389. [PMID: 35218593 DOI: 10.1113/ep090071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 02/11/2022] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? It is valuable to be able to monitor disease or treatment related changes in the microcirculation. Laser doppler flowmetry with local heating allows noninvasive monitoring of the skin microcirculation and its ability to vasodilate. Does reactive hyperemia augment the increase in skin blood flow elicited by local heating? What is the main finding and its importance? The results of this study show that the addition of reactive hyperemia to local heating results in greater vasodilation than heating alone. Thus, reactive hyperemia can augment local heat-induced hyperemia in the skin. ABSTRACT The skin circulation has been proposed as a model of generalized microvascular function which could be monitored noninvasively using laser doppler flowmetry (LDF). The response to heat hyperemia (HH) is commonly used to monitor disease or treatment related changes in microvascular function. We hypothesized that reactive hyperemia would augment the increase in skin blood flow elicited by local heating. Fourteen healthy young adults were subjected to 3 different conditions: reactive hyperemia (RH; skin temperature controlled at 33°C), heat hyperemia (HH; 42°C held for 40 minutes), and HH+RH. Two Peltier-controlled thermomodules with laser LDF probes were placed on the right forearm to continuously monitor skin blood flow. A cuff was placed on the right upper arm to elicit RH by inflation to 220 mmHg for 5 minutes. This procedure was performed with skin temperature at 33°C and again after 40 min of local heating to 42°C. Beat-by-beat mean arterial pressure (MAP) obtained by a photoplethysmographic sensor on the middle finger of the left hand allowed calculation of cutaneous vascular conductance (CVC) as LDF / MAP. Both HH and RH increased LDF (p<0.0001 and p <0.0001, respectively) and CVC (p = 0.0001 and p<0.0001) above baseline values. LDF and CVC values were significantly higher during HH+RH when compared to RH or HH alone (p<0.0001). In summary, HH+RH resulted in greater vasodilation when compared to HH or RH alone. These results indicate that RH can augment local heat-induced hyperemia in the skin. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Natalia S Lima
- Integrative Physiology Laboratory, University of Illinois at Chicago, Chicago, Illinois, United States
| | - Elizabeth C Lefferts
- Integrative Physiology Laboratory, University of Illinois at Chicago, Chicago, Illinois, United States.,Department of Kinesiology, Iowa State University, Ames, Iowa, United States
| | - Philip S Clifford
- Integrative Physiology Laboratory, University of Illinois at Chicago, Chicago, Illinois, United States
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23
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McGarr GW, King KE, Akerman AP, Fujii N, Ruzicka M, Kenny GP. Influence of uncomplicated, controlled hypertension on local heat-induced vasodilation in non-glabrous skin across the body. Am J Physiol Regul Integr Comp Physiol 2022; 322:R326-R335. [PMID: 35170329 DOI: 10.1152/ajpregu.00282.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE 1) Examine pooled effects of hypertension on nitric oxide (NO)-dependent vasodilation during local heating across multiple non-glabrous skin regions, and 2) explore regional differences. METHODS Responses were compared between fourteen participants with uncomplicated hypertension controlled with medication (7 females, 61±6 years) and fourteen age-matched non-hypertensive controls (6 females; 60±5 years). Cutaneous vascular conductance, normalized to maximum vasodilation (%CVCmax) was assessed at the upper chest, abdomen, dorsal forearm, thigh, and lateral calf during local heating. Across all regions, local skin temperatures were simultaneously increased from 33-42°C (1°C·10·s-1), and held until a stable heating plateau was achieved (~40 min), followed by continuous infusion of 20 mM of N(G)-Nitro-L-arginine methyl ester (L-NAME; ~40min) at all sites until a stable L-NAME plateau was achieved. The difference between heating and L-NAME plateaus was defined as the NO-contribution. Statistical equivalence for each heating phase was determined based on equivalence bounds of ±10%CVCmax for between-group differences. RESULTS Pooled (all-regions) %CVCmax responses were equivalent for baseline (two one-sided t-test; p<0.001), heating plateau (p=0.002), L-NAME plateau (p=0.028), and NO-contribution (p=0.003). For individual regions, responses were equivalent at baseline for the abdomen, thigh, and calf, the heating plateau for the thigh, and the L-NAME plateau for the calf (all p<0.05). Conversely, the calf heating plateau was lower in the hypertension group (t-test; p<0.05). CONCLUSION Local heat-induced cutaneous vasodilation was statistically equivalent between individuals with uncomplicated, controlled hypertension and non-hypertensive age-matched adults when pooled across multiple skin sites. Conversely, individual between-region comparisons were generally too variable to permit definitive conclusions.
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Affiliation(s)
- Gregory W McGarr
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
| | - Kelli E King
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
| | - Ashley P Akerman
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
| | - Naoto Fujii
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada.,Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba City, Japan
| | - Marcel Ruzicka
- Department of Medicine (Division of Nephrology) and the Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada
| | - Glen P Kenny
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
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24
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Pyevich M, Alexander LM, Stanhewicz AE. Women with a history of preeclampsia have preserved sensory nerve-mediated dilatation in the cutaneous microvasculature. Exp Physiol 2022; 107:175-182. [PMID: 34961978 PMCID: PMC8810741 DOI: 10.1113/ep090177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 12/20/2021] [Indexed: 02/03/2023]
Abstract
NEW FINDINGS What is the central question of this study? Are sensory nerve-mediated vasodilatation and the NO-dependent contribution to that response attenuated in the cutaneous microvasculature of women who have had preeclampsia? What is the main finding and its importance? Women who have had preeclampsia demonstrate attenuated microvascular endothelium-dependent dilatation compared to women with a history of uncomplicated pregnancy. However, there are no differences in sensory nerve-mediated vasodilatation between groups. This suggests that the neurogenic response is not altered following preeclampsia, and that the NO-dependent vasodilatation of the neurogenic response is not related to endothelium-dependent NO-mediated dilatation in these women. ABSTRACT Women who have had preeclampsia (PE) demonstrate microvascular endothelial dysfunction, mediated in part by reduced nitric oxide (NO)-dependent mechanisms. Localized heating of the skin induces a biphasic vasodilatation response: a sensory nerve-mediated initial peak, followed by a sustained endothelium-dependent plateau. We have previously shown that the endothelium-dependent plateau is attenuated in PE. However, it is unknown if the sensory nerve-mediated initial peak is similarly attenuated. Therefore, the purpose of this study was to examine the effect of PE history on sensory nerve-mediated vasodilatation and the NO-dependent contribution to that response. We hypothesized that PE would have an attenuated initial peak and a reduced NO-dependent contribution to that response compared to women with a history of normotensive pregnancy (healthy controls, HC). Nine HC (31 ± 4 years) and nine PE (28 ± 6 years) underwent a standard local heating protocol (42°C; 0.1°C s-1 ). Two intradermal microdialysis fibres were placed in the skin of the ventral forearm for the continuous local delivery of lactated Ringer solution alone (control) or 15-mM NG -nitro-l-arginine methyl ester for nitric oxide synthase (NOS) inhibition. Red blood cell flux was measured at each site by laser Doppler flowmetry (LDF). Cutaneous vascular conductance was calculated (CVC = LDF/mean arterial pressure) and normalized to maximum (%CVCmax ; 28-mM SNP + local heat 43°C). There were no differences in the initial peak between groups (HC: 79 ± 8 vs. PE: 80 ± 10%CVCmax ; P = 0.936). NOS inhibition attenuated the initial peak in both HC (57 ± 18% CVCmax ; P = 0.003) and PE (54 ± 10%CVCmax ; P = 0.002). However, there were no differences in the NO-dependent portion of the initial peak (HC: 23 ± 16 vs. PE: 24 ± 9%; P = 0.777). The local heating plateau (HC: 99 ± 4 vs. PE: 88 ± 7%CVCmax ; P = 0.001) and NO contribution to the plateau (HC: 31 ± 9 vs. PE: 17 ± 14%; P = 0.02) were attenuated in PE. There was no relation between NO-dependent dilatation in the initial peak and NO-dependent dilatation in the plateau across groups (R2 = 0.005; P = 0.943). Women who have had PE demonstrate attenuated microvascular endothelium-dependent dilatation. However, there are no differences in sensory nerve-mediated vasodilatation following PE, suggesting that the NO-dependent vasodilatation of the neurogenic response is not related to endothelium-dependent NO-mediated dilatation in these women.
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Affiliation(s)
- Michael Pyevich
- Department of Health and Human Physiology, University of Iowa, Iowa City, IA
| | - Lacy M Alexander
- Department of Kinesiology, Pennsylvania State University, University Park, PA
| | - Anna E. Stanhewicz
- Department of Health and Human Physiology, University of Iowa, Iowa City, IA
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25
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Witters K, Dockx Y, Op't Roodt J, Lefebvre W, Vanpoucke C, Plusquin M, Vangronsveld J, Janssen BG, Nawrot TS. Dynamics of skin microvascular blood flow in 4-6-year-old children in association with pre- and postnatal black carbon and particulate air pollution exposure. ENVIRONMENT INTERNATIONAL 2021; 157:106799. [PMID: 34358916 DOI: 10.1016/j.envint.2021.106799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/06/2021] [Accepted: 07/26/2021] [Indexed: 05/22/2023]
Abstract
BACKGROUND A growing body of evidence indicates that cardiovascular health in adulthood, particularly that of the microcirculation, could find its roots during prenatal development. In this study, we investigated the association between pre- and postnatal air pollution exposure on heat-induced skin hyperemia as a dynamic marker of the microvasculature. METHODS In 139 children between the ages of 4 and 6 who are followed longitudinally within the ENVIRONAGE birth cohort, we measured skin perfusion by Laser Doppler probes using the Periflux6000. Residential black carbon (BC), particulate (PM10 and PM2.5) air pollution, and nitrogen dioxide (NO2) levels were modelled for each participant's home address using a high-resolution spatiotemporal model for multiple time windows. We assessed the association between skin hyperemia and pre- and postnatal air pollution using multiple regression models while adjusting for relevant covariates. RESULTS Residential BC exposure during the whole pregnancy averaged (IQR) 1.42 (1.22-1.58) µg/m3, PM10 18.88 (16.64 - 21.13) µg/m3, PM2.5 13.67 (11.5 - 15.56) µg/m3 and NO2 18.39 (15.52 - 20.31) µg/m3. An IQR increment in BC exposure during the third trimester of pregnancy was associated with an 11.5 % (95% CI: -20.1 to -1.9; p = 0.020) lower skin hyperemia. Similar effect estimates were retrieved for PM10, PM2.5 and NO2 (respectively 13.9 % [95% CI: -21.9 to -3.0; p = 0.003], 17.0 % [95% CI: -26.7 to -6.1; p = 0.004] and 12.7% [95 % CI: -22.2 to -1.9; p = 0.023] lower skin hyperemia). In multipollutant models, PM2.5 showed the strongest inverse association with skin hyperemia. Postnatal exposure to BC, PM10, PM2.5 or NO2, was not associated with skin hyperemia at the age of 4 to 6, and did not alter the previous reported prenatal associations when taken into account. CONCLUSION Our findings support that BC, particulate air pollution, and NO2 exposure, even at low concentrations, during prenatal life, can have long-lasting consequences for the microvasculature. This proposes a role of prenatal air pollution exposures over and beyond postnatal exposure in the microvascular alterations which were persistent into childhood.
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Affiliation(s)
- Katrien Witters
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Yinthe Dockx
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Jos Op't Roodt
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Wouter Lefebvre
- Health unit, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | | | - Michelle Plusquin
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Jaco Vangronsveld
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Bram G Janssen
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium
| | - Tim S Nawrot
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, Diepenbeek 3590, Belgium; Department of Public Health and Primary Care, Leuven University, Herestraat 49-box706, Leuven 3000, Belgium.
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26
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Coombs GB, Akins JD, Patik JC, Vizcardo-Galindo GA, Figueroa-Mujica R, Tymko MM, Stacey BS, Iannetelli A, Bailey DM, Villafuerte FC, Ainslie PN, Brothers RM. Global Reach 2018: Nitric oxide-mediated cutaneous vasodilation is reduced in chronic, but not acute, hypoxia independently of enzymatic superoxide formation. Free Radic Biol Med 2021; 172:451-458. [PMID: 34129928 DOI: 10.1016/j.freeradbiomed.2021.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/23/2021] [Accepted: 06/06/2021] [Indexed: 01/15/2023]
Abstract
We tested the hypotheses that 1) cutaneous microvascular function is impaired by acute normobaric and chronic hypobaric hypoxia and 2) that the superoxide free radical (via NADPH oxidase or xanthine oxidase) contributes to this impairment via nitric oxide (NO) scavenging. Local heating-induced cutaneous hyperemia (39 °C) was measured in the forearm of 11 male lowlanders at sea level (SL) and following 14-18 days at high altitude (HA; 4340 m in Cerro de Pasco, Peru), and compared to 11 highlanders residing permanently at this elevation. Cutaneous vascular conductance (CVC; laser-Doppler flux/mean arterial pressure) was not different during 39 °C [control site: 73 (19) vs. 71 (18)%max; P = 0.68] between normoxia and acute normobaric hypoxia (FIO2 = 0.125; equivalent to HA), respectively. At HA, CVC was reduced during 39 °C in lowlanders compared to SL [control site: 54 (14) vs. 73 (19)%max; P < 0.01] and was lower in Andean highlanders compared to lowlanders at HA [control site: 50 (24) vs. 54 (14)%max; P = 0.02]. The NO contribution to vasodilation during 39 °C (i.e., effect of NO synthase inhibition) was reduced in lowlanders at HA compared to SL [control site: 41 (11) vs 49 (10)%max; P = 0.04] and in Andean highlanders compared to lowlanders at HA [control site: 32 (21) vs. 41 (11)%max; P = 0.01]. Intradermal administration (cutaneous microdialysis) of the superoxide mimetic Tempol, inhibition of xanthine oxidase (via allopurinol), or NADPH oxidase (via apocynin) had no influence on cutaneous endothelium-dependent dilation during any of the conditions (all main effects of drug P > 0.05). These results suggest that time at HA impairs NO-mediated cutaneous vasodilation independent of enzymatic superoxide formation.
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Affiliation(s)
- Geoff B Coombs
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, BC, Canada; School of Kinesiology, University of Western Ontario, London, ON, Canada
| | - John D Akins
- Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA
| | - Jordan C Patik
- Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA; Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA
| | - Gustavo A Vizcardo-Galindo
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, BC, Canada; Departamento de Ciencias Biológicas y Fisiológicas, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Romulo Figueroa-Mujica
- Departamento de Ciencias Biológicas y Fisiológicas, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Michael M Tymko
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, BC, Canada; Neurovascular Health Laboratory, Faculty of Kinesiology, Sport and Recreation, University of Alberta, Edmonton, AB, Canada
| | - Benjamin S Stacey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Pontypridd, United Kingdom
| | - Angelo Iannetelli
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Pontypridd, United Kingdom
| | - Damian M Bailey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Pontypridd, United Kingdom
| | - Francisco C Villafuerte
- Departamento de Ciencias Biológicas y Fisiológicas, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Philip N Ainslie
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, BC, Canada
| | - R Matthew Brothers
- Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA.
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27
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Koch Esteves N, Gibson OR, Khir AW, González‐Alonso J. Regional thermal hyperemia in the human leg: Evidence of the importance of thermosensitive mechanisms in the control of the peripheral circulation. Physiol Rep 2021; 9:e14953. [PMID: 34350727 PMCID: PMC8339537 DOI: 10.14814/phy2.14953] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/13/2021] [Accepted: 06/15/2021] [Indexed: 02/04/2023] Open
Abstract
Hyperthermia is thought to increase limb blood flow through the activation of thermosensitive mechanisms within the limb vasculature, but the precise vascular locus in which hyperthermia modulates perfusion remains elusive. We tested the hypothesis that local temperature-sensitive mechanisms alter limb hemodynamics by regulating microvascular blood flow. Temperature and oxygenation profiles and leg hemodynamics of the common (CFA), superficial (SFA) and profunda (PFA) femoral arteries, and popliteal artery (POA) of the experimental and control legs were measured in healthy participants during: (1) 3 h of whole leg heating (WLH) followed by 3 h of recovery (n = 9); (2) 1 h of upper leg heating (ULH) followed by 30 min of cooling and 1 h ULH bout (n = 8); and (3) 1 h of lower leg heating (LLH) (n = 8). WLH increased experimental leg temperature by 4.2 ± 1.2ºC and blood flow in CFA, SFA, PFA, and POA by ≥3-fold, while the core temperature essentially remained stable. Upper and lower leg blood flow increased exponentially in response to leg temperature and then declined during recovery. ULH and LLH similarly increased the corresponding segmental leg temperature, blood flow, and tissue oxygenation without affecting these responses in the non-heated leg segment, or perfusion pressure and conduit artery diameter across all vessels. Findings demonstrate that whole leg hyperthermia induces profound and sustained elevations in upper and lower limb blood flow and that segmental hyperthermia matches the regional thermal hyperemia without causing thermal or hemodynamic alterations in the non-heated limb segment. These observations support the notion that heat-activated thermosensitive mechanisms in microcirculation regulate limb tissue perfusion during hyperthermia.
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Affiliation(s)
- Nuno Koch Esteves
- Centre for Human Performance, Exercise and RehabilitationCollege of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
| | - Oliver R. Gibson
- Centre for Human Performance, Exercise and RehabilitationCollege of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
- Division of Sport, Health and Exercise SciencesDepartment of Life SciencesCollege of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
| | - Ashraf W. Khir
- Department of Mechanical and Aerospace EngineeringCollege of Engineering, Design and Physical SciencesBrunel University LondonUxbridgeUK
| | - José González‐Alonso
- Centre for Human Performance, Exercise and RehabilitationCollege of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
- Division of Sport, Health and Exercise SciencesDepartment of Life SciencesCollege of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
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28
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McConn BR, Gaskill BN, Schinckel AP, Green-Miller AR, Lay DC, Johnson JS. Thermoregulatory and physiological responses of nonpregnant, mid-gestation, and late-gestation sows exposed to incrementally increasing dry bulb temperature. J Anim Sci 2021; 99:6292259. [PMID: 34086897 DOI: 10.1093/jas/skab181] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 06/03/2021] [Indexed: 01/28/2023] Open
Abstract
Gestating sows may be more susceptible to increasing dry bulb temperatures (TDB) due to greater metabolic heat production and increased body mass, especially as gestation advances. However, there are few studies on the thermoregulatory and physiological responses of sows at differing gestation stages exposed to gradually increasing temperatures. The study objective was to determine the thermoregulatory and physiological responses of nonpregnant (n = 12; parity 3.27 ± 0.86), mid-gestation (59.7 ± 9.6 d pregnant, n = 12; parity 3.25 ± 0.83), and late-gestation (99.0 ± 4.8 d pregnant, n = 12; parity 3.33 ± 0.75) sows exposed to increasing TDB. Prior to the experiment (5.0 ± 0.7 d), jugular catheters were placed in all sows. During the experiment, the TDB was increased incrementally by 2.45 ± 0.43 °C every 60 min from 19.84 ± 2.15 to 35.54 ± 0.43 °C over 400 min, and relative humidity was recorded at 40.49 ± 18.57%. Respiration rate (RR), heart rate (HR), skin temperature, and vaginal temperature were measured, and blood samples were obtained via the jugular catheter every 20 min. Data were analyzed using PROC MIXED in SAS 9.4. RR increased at a lower TDB (P < 0.01) in late-gestation sows compared with mid-gestation and nonpregnant sows, but no differences were detected between mid-gestation and nonpregnant sows. Overall, late-gestation sows had greater RR (P < 0.01; 23 ± 2 breaths per min [brpm]) compared with mid-gestation (16 ± 2 brpm) and nonpregnant (15 ± 2 brpm) sows. Late-gestation sows had an overall greater HR (P < 0.01; 84 ± 5 beats per min [bpm]) than mid-gestation (76 ± 5 bpm) and nonpregnant (69 ± 5 bpm) sows. Late-gestation sows had overall reduced bicarbonate and total carbon dioxide levels (P = 0.02; 23.89 ± 1.97 and 25.41 ± 2.07 mmol/L, respectively) compared with mid-gestation (27.03 ± 1.97 and 28.58 ± 2.07 mmol/L, respectively) and nonpregnant (26.08 ± 1.97 and 27.58 ± 2.07 mmol/L, respectively) sows. Moreover, late-gestation sows had overall greater nitric oxide levels (P < 0.01; 248.82 ± 34.54 µM) compared with mid-gestation (110.47 ± 34.54 µM) and nonpregnant (41.55 ± 34.54 µM) sows. In summary, late-gestation sows appear to be more sensitive to increasing TDB as indicated by thermoregulatory and physiological responses when compared with mid-gestation or nonpregnant sows. The results from this study provide valuable information regarding thermoregulatory thresholds of sows at differing gestation stages.
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Affiliation(s)
- Betty R McConn
- Oak Ridge Institute for Science and Education, Oak Ridge, TN 37830, USA
| | - Brianna N Gaskill
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Allan P Schinckel
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Angela R Green-Miller
- Department of Agricultural and Biological Engineering, University of Illinois, Urbana, IL 61801, USA
| | - Donald C Lay
- Livestock Behavior Research Unit, USDA-ARS, West Lafayette, IN 47907, USA
| | - Jay S Johnson
- Livestock Behavior Research Unit, USDA-ARS, West Lafayette, IN 47907, USA
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29
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McGarr GW, King KE, Saci S, Leduc D, Akerman AP, Fujii N, Kenny GP. Regional variation in nitric oxide-dependent cutaneous vasodilatation during local heating in young adults. Exp Physiol 2021; 106:1671-1678. [PMID: 34143517 DOI: 10.1113/ep089671] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/15/2021] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? Are regional differences in nitric oxide (NO)-dependent cutaneous vasodilatation during local skin heating present in young adults? What is the main finding and its importance? NO-dependent cutaneous vasodilatation varied across the body. The abdomen demonstrated larger NO contributions, while the chest demonstrated smaller NO contributions, compared to other regions. This exploratory work is an important first step in characterizing regional heterogeneity of cutaneous microvascular control across the torso and limbs. Equally, it serves to generate hypotheses for future studies examining regional cutaneous microvascular control in ageing and disease. ABSTRACT Regional variations in cutaneous vasodilatation during local skin heating exist across the body. While nitric oxide (NO) is a well-known modulator of this response, the extent of regional differences in NO-dependent cutaneous vasodilatation during local skin heating remains uncertain. In 16 habitually active young adults (8 females; 25 ± 5 years), cutaneous vascular conductance, normalized to maximum vasodilatation (% CVCmax ), was assessed at the upper chest, abdomen, dorsal forearm, thigh and lateral calf during local skin heating. Across all regions, local skin temperatures were simultaneously increased from 33 to 42°C (1°C per 10 s), and held until a stable heating plateau was achieved (∼40 min). Next, with local skin temperature maintained at 42°C, 20 mM of NG -nitro-l-arginine methyl ester (l-NAME) was continuously infused at each site until a stable l-NAME plateau was achieved (∼40 min). The difference between heating and l-NAME plateaus was identified as the NO contribution for each region. There was no evidence for region-specific responses at baseline (P = 0.561), the heating plateau (P = 0.351) or l-NAME plateau (P = 0.082), but there was for the NO contribution (P = 0.048). Overall, point estimates for between-region differences in the NO contribution varied across the body from 0 to 19% CVCmax . The greatest effects were observed for the abdomen, wherein the NO contribution was consistently greater than for the other regions (range: 9-19% CVCmax ). The chest was consistently lower than the other regions (range: 7-19% CVCmax ). The smallest effects were observed between limb regions (range: 0-2% CVCmax ). These findings advance our understanding of the mechanisms influencing regional variations in the cutaneous vasodilator response to local skin heating in young adults.
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Affiliation(s)
- Gregory W McGarr
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Kelli E King
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Samah Saci
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Daphnee Leduc
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Ashley P Akerman
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Naoto Fujii
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.,Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba City, Japan
| | - Glen P Kenny
- Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
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Vågesjö E, Parv K, Ahl D, Seignez C, Herrera Hidalgo C, Giraud A, Leite C, Korsgren O, Wallén H, Juusola G, Hakovirta HH, Rundqvist H, Essand M, Holm L, Johnson RS, Thålin C, Korpisalo P, Christoffersson G, Phillipson M. Perivascular Macrophages Regulate Blood Flow Following Tissue Damage. Circ Res 2021; 128:1694-1707. [PMID: 33878889 DOI: 10.1161/circresaha.120.318380] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Evelina Vågesjö
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Kristel Parv
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - David Ahl
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Cédric Seignez
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Carmen Herrera Hidalgo
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Antoine Giraud
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Catarina Leite
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Olle Korsgren
- Immunology, Genetics and Pathology (O.K., M.E.), Uppsala University, Sweden
| | - Håkan Wallén
- Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden (H.W., C.T.)
| | - Greta Juusola
- A.I. Virtanen Institute, University of Eastern Finland, Kuopio, Finland (G.J.)
| | - Harri H Hakovirta
- Department of Vascular Surgery, Turku University Hospital, Finland (H.H.H.)
| | - Helene Rundqvist
- Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden (H.R., R.S.J.)
| | - Magnus Essand
- Immunology, Genetics and Pathology (O.K., M.E.), Uppsala University, Sweden
| | - Lena Holm
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden
| | - Randall S Johnson
- Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden (H.R., R.S.J.).,Physiology, Development and Neuroscience, University of Cambridge, United Kingdom (R.S.J.)
| | - Charlotte Thålin
- Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden (H.W., C.T.)
| | | | - Gustaf Christoffersson
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden.,The Science for Life Laboratory (G.C., M.P.), Uppsala University, Sweden
| | - Mia Phillipson
- Medical Cell Biology (E.V., K.P., D.A., C.S., C.H.H., A.G., C.L., L.H., G.C., M.P.), Uppsala University, Sweden.,The Science for Life Laboratory (G.C., M.P.), Uppsala University, Sweden
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31
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Kim J, Franke WD, Lang JA. Delayed window of improvements in skin microvascular function following a single bout of remote ischaemic preconditioning. Exp Physiol 2021; 106:1380-1388. [PMID: 33866628 DOI: 10.1113/ep089438] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 04/06/2021] [Indexed: 01/10/2023]
Abstract
NEW FINDINGS What is the central question of this study? Animal infarct studies indicate a delayed window of cardiac protection after remote ischaemic preconditioning (RIPC); however, the presence and duration of this delayed effect have not been examined in human microvasculature in vivo. What is the main finding and its importance? Cutaneous vasodilatation induced by local heating or ACh was increased significantly 24 and 48 h after a single bout of RIPC, respectively. Neither response persisted beyond ∼48 h. Sodium nitroprusside-induced cutaneous vasodilatation was not altered. These findings reveal a delayed increase in microvascular endothelial function after a single bout of RIPC. ABSTRACT Remote ischaemic preconditioning (RIPC) induces protective effects from ischaemia-reperfusion injury. In the myocardium and conduit vasculature, a single bout of RIPC confers delayed protection that begins 24 h afterwards and lasts for 2-3 days. However, the extent and the time line in which a single bout of RIPC affects the human microvasculature are unclear. We hypothesized that a single bout of RIPC results in a delayed increase in skin microvascular function. Sixteen healthy participants (age, 23 ± 4 years; seven males, nine females; MAP, 82 ± 7 mmHg) were recruited to measure cutaneous microvascular function immediately before a single bout of RIPC and 24, 48 and 72 h and 1 week after the bout. The RIPC consisted of four repetitions of 5 min of arm blood flow occlusion interspersed by 5 min reperfusion. Skin blood flow responses to local heating (local temperature of 42°C), ACh and sodium nitroprusside were measured by laser speckle contrast imaging and expressed as the cutaneous vascular conductance (CVC; in perfusion units per millimetre of mercury). Vasodilatation in response to local heating was increased 24 and 48 h after RIPC (ΔCVC, 1.05 ± 0.07 vs. 1.18 ± 0.07 and 1.24 ± 0.08 PU mmHg-1 , pre- vs. 24 and 48 h post-RIPC; P < 0.05). Acetylcholine-induced cutaneous vasodilatation increased significantly 48 h after RIPC (ΔCVC, 0.71 ± 0.07 vs. 0.93 ± 0.12 PU mmHg-1 , pre- vs. 48 h post-RIPC; P < 0.05) and returned to baseline thereafter. Sodium nitroprusside-mediated vasodilatation did not change. Thus, a single bout of RIPC elicited a delayed response in the microvasculature, resulting in an improvement in the endothelium-dependent cutaneous vasodilatory response that peaked ∼48 h post-RIPC.
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Affiliation(s)
- Jahyun Kim
- Department of Kinesiology, California State University Bakersfield, Bakersfield, California, USA
| | - Warren D Franke
- Department of Kinesiology, Iowa State University, Ames, Iowa, USA
| | - James A Lang
- Department of Kinesiology, Iowa State University, Ames, Iowa, USA
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32
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Oliver S, Pham TTP, Li Y, Xu FJ, Boyer C. More than skin deep: using polymers to facilitate topical delivery of nitric oxide. Biomater Sci 2021; 9:391-405. [PMID: 32856653 DOI: 10.1039/d0bm01197e] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Skin, the largest organ in the human body, provides several important functions, including providing protection from mechanical impacts, micro-organisms, radiation and chemicals; regulation of body temperature; the sensations of touch and temperature; and the synthesis of several substances including vitamin D, melanin, and keratin. Common dermatological disorders (CDDs) include inflammatory or immune-mediated skin diseases, skin infection, skin cancer, and wounds. In the treatment of skin disorders, topical administration has advantages over other routes of administration, and polymers are widely used as vehicles to facilitate the delivery of topical therapeutic agents, serving as matrices to keep therapeutic agents in contact with the skin. Nitric oxide (NO), a cellular signalling molecule, has attracted significant interest in treating a broad spectrum of diseases, including various skin disorders. However, there are a number of challenges in effectively delivering NO. It must be delivered in a controlled manner at sufficient concentrations to be efficacious and the delivery system must be stable during storage. The use of polymer-based systems to deliver NO topically can be an effective strategy to overcome these challenges. There are three main approaches for incorporating NO with polymers in topical delivery systems: (i) physical incorporation of NO donors into polymer bases; (ii) covalent attachment of NO donors to polymers; and (iii) encapsulation of NO donors in polymer-based particles. The latter two approaches provide the greatest control over NO release and have been used by numerous researchers in treating CDDs, including chronic wounds and skin cancer.
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Affiliation(s)
- Susan Oliver
- Australian Centre for NanoMedicine (ACN) and Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney, Australia 2052.
| | - Thi Thu Phuong Pham
- Australian Centre for NanoMedicine (ACN) and Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney, Australia 2052.
| | - Yang Li
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029, China
| | - Fu-Jian Xu
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029, China
| | - Cyrille Boyer
- Australian Centre for NanoMedicine (ACN) and Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney, Australia 2052.
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33
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Coombs GB, Tremblay JC, Shkredova DA, Carr JMJR, Wakeham DJ, Patrician A, Ainslie PN. Distinct contributions of skin and core temperatures to flow-mediated dilation of the brachial artery following passive heating. J Appl Physiol (1985) 2021; 130:149-159. [DOI: 10.1152/japplphysiol.00502.2020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The primary determinant of vascular adaptations to lifestyle interventions, such as exercise and heat therapy, is repeated elevations in vascular shear stress. Whether skin or core temperatures also modulate the vascular adaptation to acute heat exposure is unknown, likely due to difficulty in dissociating the thermal and hemodynamic responses to heat. We found that skin and core temperatures modify the acute vascular responses to passive heating irrespective of the magnitude of increase in shear stress.
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Affiliation(s)
- Geoff B. Coombs
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - Joshua C. Tremblay
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - Daria A. Shkredova
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
- Department of Physiology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Jay M. J. R Carr
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - Denis J. Wakeham
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, United Kingdom
| | - Alexander Patrician
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - Philip N. Ainslie
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
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34
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Argarini R, McLaughlin RA, Joseph SZ, Naylor LH, Carter HH, Haynes A, Marsh CE, Yeap BB, Jansen SJ, Green DJ. Visualizing and quantifying cutaneous microvascular reactivity in humans by use of optical coherence tomography: impaired dilator function in diabetes. Am J Physiol Endocrinol Metab 2020; 319:E923-E931. [PMID: 32954827 DOI: 10.1152/ajpendo.00233.2020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The pathophysiology and time course of impairment in cutaneous microcirculatory function and structure remain poorly understood in people with diabetes, partly due to the lack of investigational tools capable of directly imaging and quantifying the microvasculature in vivo. We applied a new optical coherence tomography (OCT) technique, at rest and during reactive hyperemia (RH), to assess the skin microvasculature in people with diabetes with foot ulcers (DFU, n = 13), those with diabetes without ulcers (DNU, n = 9), and matched healthy controls (CON, n = 13). OCT images were obtained from the dorsal part of the foot at rest and following 5 min of local ischemia induced by inflating a cuff around the thigh at suprasystolic level (220 mmHg). One-way ANOVA was used to compare the OCT-derived parameters (diameter, speed, flow rate, and density) at rest and in response to RH, with repeated-measures two-way ANOVA performed to analyze main and interaction effects between groups. Data are means ± SD. At rest, microvascular diameter in the DFU (84.89 ± 14.84 µm) group was higher than CON (71.25 ± 7.6 µm, P = 0.012) and DNU (71.33 ± 12.04 µm, P = 0.019) group. Speed in DFU (65.56 ± 4.80 µm/s, P = 0.002) and DNU (63.22 ± 4.35 µm/s, P = 0.050) were higher than CON (59.58 ± 3.02 µm/s). Microvascular density in DFU (22.23 ± 13.8%) was higher than in CON (9.83 ± 2.94%, P = 0.008), but not than in the DNU group (14.8 ± 10.98%, P = 0.119). All OCT-derived parameters were significantly increased in response to RH in the CON group (all P < 0.01) and DNU group (all P < 0.05). Significant increase in the DFU group was observed in speed (P = 0.031) and density (P = 0.018). The change in density was lowest in the DFU group (44 ± 34.1%) compared with CON (199.2 ± 117.5%, P = 0.005) and DNU (148.1 ± 98.4, P = 0.054). This study proves that noninvasive OCT microvascular imaging is feasible in people with diabetes, provides powerful new physiological insights, and can distinguish between healthy individuals and patients with diabetes with distinct disease severity.
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Affiliation(s)
- Raden Argarini
- Physiology Department, Faculty of Medicine, Airlangga University, Surabaya, Indonesia
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
| | - Robert A McLaughlin
- Faculty of Health and Medical Sciences, Australian Research Council Centre of Excellence for Nanoscale Biophotonics, Adelaide Medical School, University of Adelaide, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, Australia
- Department of Electrical, Electronic and Computer Engineering, University of Western Australia, Perth, Australia
| | - Simon Z Joseph
- Faculty of Health and Medical Sciences, School of Surgery, The University of Western Australia, Perth, Australia
| | - Louise H Naylor
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
| | - Howard H Carter
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
| | - Andrew Haynes
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
| | - Channa E Marsh
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
| | - Bu B Yeap
- Medical School, The University of Western Australia, Perth, Australia
- Department of Endocrinology and Diabetes, Fiona Stanley Hospital, Perth, Australia
| | - Shirley J Jansen
- Faculty of Health and Medical Sciences, School of Surgery, The University of Western Australia, Perth, Australia
- Department of Vascular and Endovascular Surgery Sir Charles Gardner Hospital, Perth, Australia
- Heart and Vascular Research Institute, Harry Perkins Institute of Medical Research, Perth, Australia
- Medical School, Curtin University, Perth, Australia
| | - Daniel J Green
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Australia
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Miller JT, Turner CG, Otis JS, Sebeh Y, Hayat MJ, Quyyumi AA, Wong BJ. Inhibition of iNOS augments cutaneous endothelial NO-dependent vasodilation in prehypertensive non-Hispanic Whites and in non-Hispanic Blacks. Am J Physiol Heart Circ Physiol 2020; 320:H190-H199. [PMID: 33124886 DOI: 10.1152/ajpheart.00644.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We tested the hypothesis that inducible nitric oxide synthase (iNOS) contributes to reduced nitric oxide (NO)-dependent vasodilation in non-Hispanic Blacks and prehypertensive non-Hispanic Whites. Twenty Black and twenty White participants (10 normotensive, 10 prehypertensive per group; n = 40 total) participated in this study. Participants were instrumented with two microdialysis fibers, and each site was randomized as control (lactated Ringer) or iNOS inhibition (0.1 mM 1400W). Laser-Doppler flow probes and local heaters were used to measure skin blood flow and heat the skin to induce vasodilation, respectively. Each site was heated from 33°C to 39°C (rate: 0.1°C/s). Once a plateau was established, 20 mM nitro-l-arginine methyl ester (l-NAME), a nonspecific NOS inhibitor, was infused at each site to quantify NO-dependent vasodilation. At control sites, %NO-dependent vasodilation was reduced in prehypertensive Whites (47 ± 10%NO) and in both normotensive and prehypertensive Blacks (39 ± 9%NO and 28 ± 5%NO, respectively) relative to normotensive Whites (73 ± 8%NO; P < 0.0001 for all comparisons). Compared with respective control sites, iNOS inhibition increased NO-dependent vasodilation in prehypertensive Whites (68 ± 8%NO) and in both normotensive and prehypertensive Blacks (78 ± 8%NO and 55 ± 6%NO, respectively; P < 0.0001 for all comparisons). We failed to find an effect for normotensive Whites (77 ± 7%NO). After iNOS inhibition, %NO-dependent vasodilation was similar between normotensive Whites, prehypertensive Whites, and normotensive Blacks. Inhibition of iNOS increased NO-dependent vasodilation to a lesser extent in prehypertensive Blacks. These data suggest that iNOS contributes to reduced NO-dependent vasodilation in prehypertension and in Black participants.NEW & NOTEWORTHY Inducible nitric oxide synthase (iNOS) is typically upregulated in conditions of increased oxidative stress and may have detrimental effects on the vasculature. Endothelial nitric oxide (NO), which is cardioprotective, is reduced in prehypertensive non-Hispanic Whites and in non-Hispanic Blacks. We found that inhibition of iNOS can increase endothelial NO-dependent vasodilation in prehypertensive White participants and in both normotensive and prehypertensive Black participants.Inducible nitric oxide (NO) synthase (iNOS) can be upregulated under conditions of increased oxidative stress and may have detrimental effects on the vasculature. Endothelial NO, which is cardioprotective, is reduced in prehypertensive non-Hispanic Whites and in non-Hispanic Blacks. We found that inhibition of iNOS can increase endothelial NO-dependent vasodilation in prehypertensive White participants and in both normotensive and prehypertensive Black participants.
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Affiliation(s)
- James T Miller
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Casey G Turner
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Jeffrey S Otis
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Yesser Sebeh
- School of Public Health, Georgia State University, Atlanta, Georgia
| | - Matthew J Hayat
- School of Public Health, Georgia State University, Atlanta, Georgia
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, Emory University School of Medicine, Atlanta, Georgia
| | - Brett J Wong
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
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Geraets AF, van Agtmaal MJ, Stehouwer CD, Sörensen BM, Berendschot TT, Webers CA, Schaper NC, Henry RM, van der Kallen CJ, Eussen SJ, Koster A, van Sloten TT, Köhler S, Schram MT, Houben AJ. Association of Markers of Microvascular Dysfunction With Prevalent and Incident Depressive Symptoms. Hypertension 2020; 76:342-349. [DOI: 10.1161/hypertensionaha.120.15260] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The etiology of late-life depression (LLD) is still poorly understood. Microvascular dysfunction (MVD) has been suggested to play a role in the etiology of LLD, but direct evidence of this association is scarce. The aim of this study was to investigate whether direct and indirect markers of early microvascular dysfunction are associated with prevalent and incident LLD in the population-based Maastricht Study cohort. We measured microvascular dysfunction at baseline by use of flicker light-induced retinal vessel dilation response (Dynamic Vessel Analyzer), heat-induced skin hyperemic response (laser- Doppler flowmetry), and plasma markers of endothelial dysfunction (endothelial dysfunction; sICAM-1 [soluble intercellular adhesion molecule-1], sVCAM-1 [soluble vascular adhesion molecule-1], sE-selectin [soluble E-selectin], and vWF [Von Willebrand Factor]). Depressive symptoms were assessed with the 9-item Patient Health Questionnaire (PHQ-9) at baseline and annually over 4 years of follow-up (n=3029; mean age 59.6±8.2 years, 49.5% were women, n=132 and n=251 with prevalent and incident depressive symptoms [PHQ-9≥10]). We used logistic, negative binominal and Cox regression analyses, and adjusted for demographic, cardiovascular, and lifestyle factors. Retinal venular dilatation and plasma markers of endothelial dysfunction were associated with the more prevalent depressive symptoms after full adjustment (PHQ-9 score, RR, 1.05 [1.00–1.11] and RR 1.06 [1.01–1.11], respectively). Retinal venular dilatation was also associated with prevalent depressive symptoms (PHQ-9≥10; odds ratio, 1.42 [1.09–1.84]), after full adjustment. Retinal arteriolar dilatation and plasma markers of endothelial dysfunction were associated with incident depressive symptoms (PHQ-9≥10; HR, 1.23 [1.04–1.46] and HR, 1.19 [1.05–1.35]), after full adjustment. These findings support the concept that microvascular dysfunction in the retina, and plasma markers of endothelial dysfunction is involved in the etiology of LLD and might help in finding additional targets for the prevention and treatment of LLD.
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Affiliation(s)
- Anouk F.J. Geraets
- Department of Psychiatry and Neuropsychology (A.F.J.G., S.K., M.T.S.), Maastricht University Medical Center (MUMC+), the Netherlands
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School of Mental Health and Neuroscience (MHeNs) (A.F.J.G., T.T.J.M.B., S.K., M.T.S.), Maastricht University, the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Marnix J.M. van Agtmaal
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Coen D.A. Stehouwer
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Ben M. Sörensen
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Tos T.J.M. Berendschot
- Department of Ophthalmology (T.T.J.M.B., C.A.B.W.), Maastricht University Medical Center (MUMC+), the Netherlands
- School of Mental Health and Neuroscience (MHeNs) (A.F.J.G., T.T.J.M.B., S.K., M.T.S.), Maastricht University, the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Carroll A.B. Webers
- Department of Ophthalmology (T.T.J.M.B., C.A.B.W.), Maastricht University Medical Center (MUMC+), the Netherlands
| | - Nicolaas C. Schaper
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Ronald M.A. Henry
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- Heart and Vascular Center (R.M.A.H., M.T.S.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Carla J.H. van der Kallen
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Simone J.P.M. Eussen
- Department of Epidemiology (S.J.P.M.E.), Maastricht University Medical Center (MUMC+), the Netherlands
- Care and Public Health Research Institute (CAPHRI), Faculty of Health, Medicine & Life Sciences (S.J.P.M.E., A.K.), Maastricht University, the Netherlands
| | - Annemarie Koster
- Department of Social Medicine (A.K.), Maastricht University Medical Center (MUMC+), the Netherlands
- Care and Public Health Research Institute (CAPHRI), Faculty of Health, Medicine & Life Sciences (S.J.P.M.E., A.K.), Maastricht University, the Netherlands
| | - Thomas T. van Sloten
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Sebastian Köhler
- Department of Psychiatry and Neuropsychology (A.F.J.G., S.K., M.T.S.), Maastricht University Medical Center (MUMC+), the Netherlands
- School of Mental Health and Neuroscience (MHeNs) (A.F.J.G., T.T.J.M.B., S.K., M.T.S.), Maastricht University, the Netherlands
| | - Miranda T. Schram
- Department of Psychiatry and Neuropsychology (A.F.J.G., S.K., M.T.S.), Maastricht University Medical Center (MUMC+), the Netherlands
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- Heart and Vascular Center (R.M.A.H., M.T.S.), Maastricht University Medical Center (MUMC+), the Netherlands
- School of Mental Health and Neuroscience (MHeNs) (A.F.J.G., T.T.J.M.B., S.K., M.T.S.), Maastricht University, the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
| | - Alfons J.H.M. Houben
- Department of Internal Medicine (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University Medical Center (MUMC+), the Netherlands
- School for Cardiovascular Diseases (CARIM) (A.F.J.G., M.J.M.v.A., C.D.A.S., B.M.S., N.C.S., R.M.A.H., C.J.H.v.d.K., T.T.v.S., M.T.S., A.J.H.M.H.), Maastricht University, the Netherlands
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Argarini R, McLaughlin RA, Joseph SZ, Naylor LH, Carter HH, Yeap BB, Jansen SJ, Green DJ. Optical coherence tomography: a novel imaging approach to visualize and quantify cutaneous microvascular structure and function in patients with diabetes. BMJ Open Diabetes Res Care 2020; 8:8/1/e001479. [PMID: 32847842 PMCID: PMC7451490 DOI: 10.1136/bmjdrc-2020-001479] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/05/2020] [Accepted: 06/27/2020] [Indexed: 01/13/2023] Open
Abstract
INTRODUCTION The pathophysiology of microvascular disease is poorly understood, partly due to the lack of tools to directly image microvessels in vivo. RESEARCH DESIGN AND METHODS In this study, we deployed a novel optical coherence tomography (OCT) technique during local skin heating to assess microvascular structure and function in diabetics with (DFU group, n=13) and without (DNU group, n=10) foot ulceration, and healthy controls (CON group, n=13). OCT images were obtained from the dorsal foot, at baseline (33°C) and 30 min following skin heating. RESULTS At baseline, microvascular density was higher in DFU compared with CON (21.9%±11.5% vs 14.3%±5.6%, p=0.048). Local heating induced significant increases in diameter, speed, flow rate and density in all groups (all p<0.001), with smaller changes in diameter for the DFU group (94.3±13.4 µm), compared with CON group (115.5±11.7 µm, p<0.001) and DNU group (106.7±12.1 µm, p=0.014). Heating-induced flow rate was lower in the DFU group (584.3±217.0 pL/s) compared with the CON group (908.8±228.2 pL/s, p<0.001) and DNU group (768.8±198.4 pL/s, p=0.014), with changes in density also lower in the DFU group than CON group (44.7%±15.0% vs 56.5%±9.1%, p=0.005). CONCLUSIONS This proof of principle study indicates that it is feasible to directly visualize and quantify microvascular function in people with diabetes; and distinguish microvascular disease severity between patients.
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Affiliation(s)
- Raden Argarini
- Physiology, Airlangga University Faculty of Medicine, Surabaya, Jawa Timur, Indonesia
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Western Australia, Australia
| | - Robert A McLaughlin
- Faculty of Health and Medical Sciences, Adelaide Medical School, Australian Research Council Centre of Excellence for Nanoscale Biophotonics, University of Adelaide, Adelaide, South Australia, Australia
- Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia, Australia
| | - Simon Z Joseph
- Faculty of Health and Medical Sciences, School of Surgery, The University of Western Australia, Perth, Western Australia, Australia
| | - Louise H Naylor
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Western Australia, Australia
| | - Howard H Carter
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Western Australia, Australia
| | - Bu B Yeap
- School of Medicine and Pharmacology, The University of Western Australia, Perth, Western Australia, Australia
- Department of Endocrinology and Diabetes, Fiona Stanley Hospital, Perth, Western Australia, Australia
| | - Shirley J Jansen
- Faculty of Health and Medical Sciences, School of Surgery, The University of Western Australia, Perth, Western Australia, Australia
- Vascular and Endovascular Surgery, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia
| | - Daniel J Green
- Cardiovascular Research Group, School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Western Australia, Australia
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Wong BJ, Turner CG, Miller JT, Walker DC, Sebeh Y, Hayat MJ, Otis JS, Quyyumi AA. Sensory nerve-mediated and nitric oxide-dependent cutaneous vasodilation in normotensive and prehypertensive non-Hispanic blacks and whites. Am J Physiol Heart Circ Physiol 2020; 319:H271-H281. [PMID: 32559139 DOI: 10.1152/ajpheart.00177.2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The purpose of this study was to investigate the effect of race and subclinical elevations in blood pressure (i.e., prehypertension) on cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation. We recruited participants who self-identified as either non-Hispanic black (n = 16) or non-Hispanic white (n = 16). Within each group, participants were subdivided as either normotensive (n = 8 per group) or prehypertensive (n = 8 per group). Each participant was instrumented with four intradermal microdialysis fibers: 1) control (lactated Ringer's), 2) 5% lidocaine (sensory nerve inhibition), 3) 20 mM Nω-nitro-l-arginine methyl ester (l-NAME) (NO synthase inhibition), and 4) lidocaine + l-NAME. Skin blood flow was assessed via laser-Doppler flowmetry, and each site underwent local heating from 33°C to 39°C. At the plateau, 20 mM l-NAME were infused at control and lidocaine sites to quantify NO-dependent vasodilation. Maximal vasodilation was induced via 54 mM sodium nitroprusside and local heating to 43°C. Data are means ± SD. Sensory nerve-mediated cutaneous vasodilation was reduced in prehypertensive non-Hispanic white (34 ± 7%) and both non-Hispanic black groups (normotensive, 20 ± 9%, prehypertensive, 24 ± 15%) relative to normotensive non-Hispanic whites (54 ± 12%). NO-dependent vasodilation was also reduced in prehypertensive non-Hispanic white (41 ± 7%) and both non-Hispanic black groups (normotensive, 44 ± 7%, prehypertensive, 19 ± 7%) relative to normotensive non-Hispanic whites (60 ± 11%). The decrease in NO-dependent vasodilation in prehypertensive non-Hispanic blacks was further reduced relative to all other groups. These data suggest subclinical increases in blood pressure adversely affect sensory-mediated and NO-dependent vasodilation in both non-Hispanic blacks and whites.NEW & NOTEWORTHY Overt hypertension is known to reduce cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation, but the effect of subclinical increases in blood pressure (i.e., prehypertension) is unknown. The combined effect of race and prehypertension is also unknown. In this study, we found that prehypertension reduces cutaneous sensory nerve-mediated and NO-dependent vasodilation in both non-Hispanic white and black populations, with the greatest reductions observed in prehypertensive non-Hispanic blacks.
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Affiliation(s)
- Brett J Wong
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Casey G Turner
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - James T Miller
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Demetria C Walker
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Yesser Sebeh
- School of Public Health, Georgia State University, Atlanta, Georgia
| | - Matthew J Hayat
- School of Public Health, Georgia State University, Atlanta, Georgia
| | - Jeffrey S Otis
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia
| | - Arshed A Quyyumi
- Emory Clinical Cardiovascular Research Institute, School of Medicine, Emory University, Atlanta, Georgia
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LaCount TD, Zhang Q, Hao J, Ghosh P, Raney SG, Talattof A, Kasting GB, Li SK. Modeling Temperature-Dependent Dermal Absorption and Clearance for Transdermal and Topical Drug Applications. AAPS JOURNAL 2020; 22:70. [PMID: 32390069 DOI: 10.1208/s12248-020-00451-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 03/24/2020] [Indexed: 02/07/2023]
Abstract
A computational model was developed to better understand the impact of elevated skin temperatures on transdermal drug delivery and dermal clearance. A simultaneous heat and mass transport model with emphasis on transdermal delivery system (TDS) applications was developed to address transient and steady-state temperature effects on dermal absorption. The model was tested using representative data from nicotine TDS applied to human skin either in vitro or in vivo. The approximately 2-fold increase of nicotine absorption with a 10°C increase in skin surface temperature was consistent with a 50-65 kJ/mol activation energy for diffusion in the stratum corneum, with this layer serving as the primary barrier for nicotine absorption. Incorporation of a dermal clearance component into the model revealed efficient removal of nicotine via the dermal capillaries at both normal and elevated temperatures. Two-compartment pharmacokinetic simulations yielded systemic drug concentrations consistent with the human pharmacokinetic data. Both in vitro skin permeation and in vivo pharmacokinetics of nicotine delivered from a marketed TDS under normal and elevated temperatures can be satisfactorily described by a simultaneous heat and mass transfer computational model incorporating realistic skin barrier properties and dermal clearance components.
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Affiliation(s)
- Terri D LaCount
- Division of Pharmaceutical Sciences, James L Winkle College of Pharmacy, University of Cincinnati Academic Health Center, 231 Albert Sabin Way, Cincinnati, Ohio, 45267-0514, USA
| | - Qian Zhang
- Division of Pharmaceutical Sciences, James L Winkle College of Pharmacy, University of Cincinnati Academic Health Center, 231 Albert Sabin Way, Cincinnati, Ohio, 45267-0514, USA
| | - Jinsong Hao
- Department of Pharmaceutical Science and Research, School of Pharmacy, Marshall University, Huntington, West Virginia, 25755, USA.,Department of Pharmaceutical Sciences, College of Pharmacy & Health Sciences, Campbell University, Buies Creek, North Carolina, 27506, USA
| | - Priyanka Ghosh
- Office of Research and Standards, Office of Generic Drugs, U.S. Food and Drug Administration, Silver Spring, Maryland, 20993, USA
| | - Sam G Raney
- Office of Research and Standards, Office of Generic Drugs, U.S. Food and Drug Administration, Silver Spring, Maryland, 20993, USA
| | - Arjang Talattof
- Office of Research and Standards, Office of Generic Drugs, U.S. Food and Drug Administration, Silver Spring, Maryland, 20993, USA
| | - Gerald B Kasting
- Division of Pharmaceutical Sciences, James L Winkle College of Pharmacy, University of Cincinnati Academic Health Center, 231 Albert Sabin Way, Cincinnati, Ohio, 45267-0514, USA.
| | - S Kevin Li
- Division of Pharmaceutical Sciences, James L Winkle College of Pharmacy, University of Cincinnati Academic Health Center, 231 Albert Sabin Way, Cincinnati, Ohio, 45267-0514, USA
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Turner CG, Miller JT, Otis JS, Hayat MJ, Quyyumi AA, Wong BJ. Cutaneous sensory nerve-mediated microvascular vasodilation in normotensive and prehypertensive non-Hispanic Blacks and Whites. Physiol Rep 2020; 8:e14437. [PMID: 32401424 PMCID: PMC7219271 DOI: 10.14814/phy2.14437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 04/04/2020] [Accepted: 04/17/2020] [Indexed: 11/24/2022] Open
Abstract
Relative to non-Hispanic Whites, non-Hispanic Blacks are disproportionately affected by elevated blood pressure (BP). It is unknown whether race or subclinical increases in BP affect the ability of cutaneous sensory nerves to induce cutaneous microvascular vasodilation. Sixteen participants who self-identified as non-Hispanic Black (n = 8) or non-Hispanic White (n = 8) were subgrouped as normotensive or prehypertensive. Participants were instrumented with three intradermal microdialysis fibers: (a) control, (b) 1 μM sodium nitroprusside (SNP), an exogenous nitric oxide (NO) donor, and (c) 20 mM NG -nitro-l-arginine methyl ester (L-NAME), a non-selective NO synthase inhibitor. A slow local heating protocol (33-40°C, 0.1°C/min) was used to assess the onset of cutaneous sensory nerve-mediated vasodilation (temperature threshold) and skin blood flow was measured using laser-Doppler flowmetry. At control sites, the temperature threshold occurred at a higher temperature in non-Hispanic Blacks (normotensive: 37.2 ± 0.6°C, prehypertensive: 38.9 ± 0.5°C) compared to non-Hispanic Whites (normotensive: 35.2 ± 0.8°C, prehypertensive: 35.2 ± 0.9°C). L-NAME shifted the temperature threshold higher in non-Hispanic Whites (normotensive: 37.8 ± 0.7°C, prehypertensive: 38.2 ± 0.8°C), but there was no observed effect in non-Hispanic Blacks. SNP did not affect temperature threshold in non-Hispanic Whites, but shifted the temperature threshold lower in non-Hispanic Blacks (normotensive: 34.6 ± 1.2°C, prehypertensive: 34.8 ± 1.1°C). SNP mitigated differences in temperature threshold across all groups. There was no effect found for BP status in either the non-Hispanic Black or non-Hispanic White groups. These data suggest that reduced NO bioavailability affects the ability of cutaneous sensory nerves to induce microvascular vasodilation in young, otherwise healthy non-Hispanic Blacks.
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Affiliation(s)
- Casey G. Turner
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGAUSA
| | - James T. Miller
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGAUSA
| | - Jeffrey S. Otis
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGAUSA
| | | | - Arshed A. Quyyumi
- Emory Clinical Cardiovascular Research InstituteSchool of MedicineEmory UniversityAtlantaGAUSA
| | - Brett J. Wong
- Department of Kinesiology & HealthGeorgia State UniversityAtlantaGAUSA
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Sörensen BM, van der Heide FCT, Houben AJHM, Koster A, T J M Berendschot T, S A G Schouten J, Kroon AA, van der Kallen CJH, Henry RMA, van Dongen MCJM, J P M Eussen S, H C M Savelberg H, van der Berg JD, Schaper NC, Schram MT, Stehouwer CDA. Higher levels of daily physical activity are associated with better skin microvascular function in type 2 diabetes-The Maastricht Study. Microcirculation 2020; 27:e12611. [PMID: 31997430 PMCID: PMC7317394 DOI: 10.1111/micc.12611] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 12/19/2019] [Accepted: 01/27/2020] [Indexed: 12/13/2022]
Abstract
Objective Physical activity may provide a means for the prevention of cardiovascular disease via improving microvascular function. Therefore, this study investigated whether physical activity is associated with skin and retinal microvascular function. Methods In The Maastricht Study, a population‐based cohort study enriched with type 2 diabetes (n = 1298, 47.3% women, aged 60.2 ± 8.1 years, 29.5% type 2 diabetes), we studied whether accelerometer‐assessed physical activity and sedentary time associate with skin and retinal microvascular function. Associations were studied by linear regression and adjusted for major cardiovascular risk factors. In addition, we investigated whether associations were stronger in type 2 diabetes. Results In individuals with type 2 diabetes, total physical activity and higher‐intensity physical activity were independently associated with greater heat‐induced skin hyperemia (regression coefficients per hour), respectively, 10 (95% CI: 1; 18) and 36 perfusion units (14; 58). In individuals without type 2 diabetes, total physical activity and higher‐intensity physical activity were not associated with heat‐induced skin hyperemia. No associations with retinal arteriolar %‐dilation were identified. Conclusion Higher levels of total and higher‐intensity physical activity were associated with greater skin microvascular vasodilation in individuals with, but not in those without, type 2 diabetes.
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Affiliation(s)
- Ben M Sörensen
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Frank C T van der Heide
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Alfons J H M Houben
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Annemarie Koster
- CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, The Netherlands.,Department of Social Medicine, Maastricht University, Maastricht, The Netherlands
| | - Tos T J M Berendschot
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Jan S A G Schouten
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Abraham A Kroon
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Carla J H van der Kallen
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Ronald M A Henry
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands.,Heart and Vascular Center, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Martien C J M van Dongen
- CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, The Netherlands.,Department of Epidemiology, Maastricht University, Maastricht, The Netherlands
| | - Simone J P M Eussen
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Hans H C M Savelberg
- NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.,Department of Human Movement Sciences, Maastricht University, Maastricht, The Netherlands
| | - Julianne D van der Berg
- CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, The Netherlands.,Department of Social Medicine, Maastricht University, Maastricht, The Netherlands
| | - Nicolaas C Schaper
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands.,CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, The Netherlands
| | - Miranda T Schram
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands.,Heart and Vascular Center, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Coen D A Stehouwer
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.,Department of Internal Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands
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Kim J, Franke WD, Lang JA. Improved endothelial-dependent and endothelial-independent skin vasodilator responses following remote ischemic preconditioning. Am J Physiol Heart Circ Physiol 2020; 318:H110-H115. [PMID: 31774694 DOI: 10.1152/ajpheart.00467.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
One week of daily remote ischemic preconditioning (RIPC) improves cutaneous vasodilatory (VD) function. However, the underlying mechanisms and the number of sessions needed to optimize this adaptive response remain unclear. We hypothesized that the responses to localized heating of the skin will be greater after 2 wk as opposed to 1 wk of RIPC. Furthermore, 2 wk of repeated RIPC will augment cutaneous VD responses to thermal and pharmacological stimuli. In methods, twenty-four participants (24 ± 2 yr; 13 men, 11 women) performed repeated RIPC (7 daily sessions over 1 wk, n = 11; 12 sessions over 2 wk, n = 13), consisting of four repetitions of 5 min of arm blood flow occlusion separated by 5 min reperfusion. Laser speckle contrast imaging was used to measure skin blood flow responses, in perfusion units (PU), to local heating (Tloc = 42°C), acetylcholine (ACh), and sodium nitroprusside (SNP) before and after repeated RIPC. Data were expressed as cutaneous vascular conductance (CVC, in PU/mmHg). In results, the VD response to local heating increased after RIPC (∆CVC from baseline; 1 wk: 0.94 ± 0.11 to 1.19 ± 0.15, 2 wk: 1.18 ± 0.07 to 1.33 ± 0.10 PU/mmHg; P < 0.05) but the ∆CVC did not differ between weeks. SNP-induced VD increased after 2 wk of RIPC (∆CVC; 0.34 ± 0.07 to 0.63 ± 0.11 PU/mmHg; P < 0.05), but ACh-induced VD did not. In conclusion, repeated RIPC improves local heating- and SNP-mediated cutaneous VD. When compared with 1 wk of RIPC, 2 wk of RIPC does not induce further improvements in cutaneous VD function.NEW & NOTEWORTHY Repeated RIPC increases the cutaneous vasodilatory response to local heating and to sodium nitroprusside but not to acetylcholine. Thus, endothelial-independent and local heating-mediated cutaneous vasodilation are improved following RIPC. However, 2 wk of RIPC sessions are not more effective than 1 wk of RIPC sessions in enhancing local heating-mediated cutaneous vasodilation.
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Affiliation(s)
- Jahyun Kim
- Department of Kinesiology, Iowa State University, Ames, Iowa
| | - Warren D Franke
- Department of Kinesiology, Iowa State University, Ames, Iowa
| | - James A Lang
- Department of Kinesiology, Iowa State University, Ames, Iowa.,Department of Physical Therapy, Des Moines University, Des Moines, Iowa
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44
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Didier KD, Hammer SM, Alexander AM, Caldwell JT, Sutterfield SL, Smith JR, Ade CJ, Barstow TJ. Microvascular blood flow during vascular occlusion tests assessed by diffuse correlation spectroscopy. Exp Physiol 2019; 105:201-210. [DOI: 10.1113/ep087866] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 10/29/2019] [Indexed: 01/13/2023]
Affiliation(s)
- Kaylin D. Didier
- Department of Kinesiology Kansas State University Manhattan KS USA
| | - Shane M. Hammer
- Department of Kinesiology Kansas State University Manhattan KS USA
| | | | | | | | - Joshua R. Smith
- Department of Kinesiology Kansas State University Manhattan KS USA
| | - Carl J. Ade
- Department of Kinesiology Kansas State University Manhattan KS USA
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45
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Low DA, Jones H, Cable NT, Alexander LM, Kenney WL. Historical reviews of the assessment of human cardiovascular function: interrogation and understanding of the control of skin blood flow. Eur J Appl Physiol 2019; 120:1-16. [PMID: 31776694 PMCID: PMC6969866 DOI: 10.1007/s00421-019-04246-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 10/19/2019] [Indexed: 02/06/2023]
Abstract
Several techniques exist for the determination of skin blood flow that have historically been used in the investigation of thermoregulatory control of skin blood flow, and more recently, in clinical assessments or as an index of global vascular function. Skin blood flow measurement techniques differ in their methodology and their strengths and limitations. To examine the historical development of techniques for assessing skin blood flow by describing the origin, basic principles, and important aspects of each procedure and to provide recommendations for best practise. Venous occlusion plethysmography was one of the earliest techniques to intermittently index a limb’s skin blood flow under conditions in which local muscle blood flow does not change. The introduction of laser Doppler flowmetry provided a method that continuously records an index of skin blood flow (red cell flux) (albeit from a relatively small skin area) that requires normalisation due to high site-to-site variability. The subsequent development of laser Doppler and laser speckle imaging techniques allows the mapping of skin blood flow from larger surface areas and the visualisation of capillary filling from the dermal plexus in two dimensions. The use of iontophoresis or intradermal microdialysis in conjunction with laser Doppler methods allows for the local delivery of pharmacological agents to interrogate the local and neural control of skin blood flow. The recent development of optical coherence tomography promises further advances in assessment of the skin circulation via three-dimensional imaging of the skin microvasculature for quantification of vessel diameter and vessel recruitment.
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Affiliation(s)
- David A Low
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK.
| | - Helen Jones
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK
| | - N Tim Cable
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Liverpool, UK
| | - Lacy M Alexander
- Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
| | - W Larry Kenney
- Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
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46
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Kim K, Brothers RM. Acute consumption of flavanol-rich cocoa beverage improves attenuated cutaneous microvascular function in healthy young African Americans. Microvasc Res 2019; 128:103931. [PMID: 31654654 DOI: 10.1016/j.mvr.2019.103931] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 09/08/2019] [Accepted: 09/22/2019] [Indexed: 12/24/2022]
Abstract
Flavanols have beneficial effects on vascular health and we have recently demonstrated that cerebral vasodilatory capacity in healthy young African Americans (AA) is improved with acute flavanol intake relative to aged-matched Caucasian Americans (CA). However, whether the positive benefits of acute flavanol consumption would also be present in the cutaneous microvascular circulation of AA remains unknown. Thus, we hypothesized that acute consumption of flavanol-rich cocoa (FC) would improve the previously reported reduced cutaneous microvascular responses to local heating in young AA. Seven AA and seven CA participated in this double-blind crossover study. Data were collected on two different days, separated by a minimum of one week. Two intradermal microdialysis membranes were inserted in the forearm and each site was randomly assigned to receive lactated Ringer's solution or NO synthase (NOS) inhibitor. Participants were randomly assigned to consume either a non-flavanol containing (NF) beverage or FC beverage. Cutaneous vascular conductance (CVC) was calculated as cutaneous blood flux/mean arterial pressure and normalized as % maximal CVC (%CVCmax). The difference in %CVCmax between the Ringer's site and NOS inhibited site was calculated to assess NO contribution (Δ %CVCmax). In the Ringer's site, acute consumption of FC beverage improved %CVCmax during 39 °C heating when compared to NF beverage in AA (NF: 36 ± 6 vs. FC: 47 ± 5%CVCmax; P < .01) while there was similar %CVCmax during 39 °C heating between beverages in CA (NF: 55 ± 4 vs. FC: 59 ± 5%CVCmax; P = .40). During 39 °C heating, NO contribution was significantly higher with FC beverage than NF beverage in AA (NF: 27 ± 5 vs. FC: 35 ± 4 Δ %CVCmax; P = .03) while there was similar NO contribution between beverages in CA (NF: 42 ± 4 vs. FC: 45 ± 4 Δ %CVCmax; P = .36). This data suggests that acute consumption of FC could be a therapeutic solution to improve an attenuated microvascular function in young AA.
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Affiliation(s)
- Kiyoung Kim
- Department of Pharmacology & Experimental Therapeutics and the Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - R Matthew Brothers
- Department of Kinesiology, The University of Texas at Arlington, Arlington, TX, United States of America.
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47
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Chaseling GK, Crandall CG, Gagnon D. Skin blood flow measurements during heat stress: technical and analytical considerations. Am J Physiol Regul Integr Comp Physiol 2019; 318:R57-R69. [PMID: 31596109 DOI: 10.1152/ajpregu.00177.2019] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
During heat stress, the skin vasculature can greatly increase conductance secondary to vasodilation. The subsequent increase in skin blood flow allows for convective heat transfer from the core to the skin and between the skin surface and the surrounding environment. Measurement of skin blood flow, therefore, provides valuable information regarding heat exchange between the body and the environment. In addition, assessment of skin blood flow can be used to study vascular control mechanisms. Most often, skin blood flow is measured by venous occlusion plethysmography, Doppler ultrasound, laser-Doppler flowmetry, and, more recently, optical coherence tomography. However, important delimitations to each of these methods, which may be dependent on the research question, must be considered when responses from these approaches are interpreted. In this brief review, we discuss these methods of skin blood flow measurement and highlight potential sources of error and limitations. We also provide recommendations to guide the interpretation of skin blood flow data.
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Affiliation(s)
- Georgia K Chaseling
- Cardiovascular Prevention and Rehabilitation Centre, Montreal Heart Institute, Montréal, Québec, Canada.,Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Craig G Crandall
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, and University of Texas Southwestern Medical Center, Dallas, Texas
| | - Daniel Gagnon
- Cardiovascular Prevention and Rehabilitation Centre, Montreal Heart Institute, Montréal, Québec, Canada.,Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
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48
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Wang Y, Zhu K, Wang J, Yang L. Numerical simulation of heat induced flow-mediated dilation of blood vessels. J Therm Biol 2019; 84:323-330. [PMID: 31466770 DOI: 10.1016/j.jtherbio.2019.07.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 07/22/2019] [Accepted: 07/22/2019] [Indexed: 11/30/2022]
Abstract
Local heat can accelerate the blood circulation and induce the vasodilatation. Investigators reported that local heat causes an increase in skin blood flow consisting of two phases. The first is solely sensory neural, and the second is nitric oxide mediated. However, the mechanism underlying the skin blood flow response to local heating are complex and poorly understood. The mechanisms behind these two phases are deduced to be linked by flow-mediated dilation. In this study, the variation of the blood flow and the blood vessel diameter are monitored during local heating. According to the dynamic blood flow, the theoretical model of flow mediated dilation involving the key agents production and transportation was first used to study vasodilatation process during heating, and the variations of blood vessel was obtained. Finally, accurate distributions of the nitric oxide, calcium and myosin concentrations in the arterial wall were found during autoregulation. We evaluated the time course of the blood vessel changing and verified the fact that the second increase in blood flow is the result of flow dilation mediation. The effects of dilation of blood vessel were also analyzed.
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Affiliation(s)
- Yabo Wang
- Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, China.
| | - Kai Zhu
- Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, China
| | - Jinshan Wang
- Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin, China
| | - Long Yang
- Tianjin First Central Hospital, Tianjin, 300192, China
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49
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Ahl D, Eriksson O, Sedin J, Seignez C, Schwan E, Kreuger J, Christoffersson G, Phillipson M. Turning Up the Heat: Local Temperature Control During in vivo Imaging of Immune Cells. Front Immunol 2019; 10:2036. [PMID: 31507619 PMCID: PMC6718468 DOI: 10.3389/fimmu.2019.02036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 08/12/2019] [Indexed: 01/21/2023] Open
Abstract
Intravital imaging is an invaluable tool for studying the expanding range of immune cell functions. Only in vivo can the complex and dynamic behavior of leukocytes and their interactions with their natural microenvironment be observed and quantified. While the capabilities of high-speed, high-resolution confocal and multiphoton microscopes are well-documented and steadily improving, other crucial hardware required for intravital imaging is often developed in-house and less commonly published in detail. In this report, we describe a low-cost, multipurpose, and tissue-stabilizing in vivo imaging platform that enables sensing and regulation of local tissue temperature. The effect of tissue temperature on local blood flow and leukocyte migration is demonstrated in muscle and skin. Two different models of vacuum windows are described in this report, however, the design of the vacuum window can easily be adapted to fit different organs and tissues.
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Affiliation(s)
- David Ahl
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Olle Eriksson
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - John Sedin
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Cédric Seignez
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Emil Schwan
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Johan Kreuger
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | | | - Mia Phillipson
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
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50
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Smith CJ. Pediatric Thermoregulation: Considerations in the Face of Global Climate Change. Nutrients 2019; 11:nu11092010. [PMID: 31454933 PMCID: PMC6770410 DOI: 10.3390/nu11092010] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/10/2019] [Accepted: 08/16/2019] [Indexed: 12/16/2022] Open
Abstract
Predicted global climate change, including rising average temperatures, increasing airborne pollution, and ultraviolet radiation exposure, presents multiple environmental stressors contributing to increased morbidity and mortality. Extreme temperatures and more frequent and severe heat events will increase the risk of heat-related illness and associated complications in vulnerable populations, including infants and children. Historically, children have been viewed to possess inferior thermoregulatory capabilities, owing to lower sweat rates and higher core temperature responses compared to adults. Accumulating evidence counters this notion, with limited child–adult differences in thermoregulation evident during mild and moderate heat exposure, with increased risk of heat illness only at environmental extremes. In the context of predicted global climate change, extreme environmental temperatures will be encountered more frequently, placing children at increased risk. Thermoregulatory and overall physiological strain in high temperatures may be further exacerbated by exposure to/presence of physiological and environmental stressors including pollution, ultraviolet radiation, obesity, diabetes, associated comorbidities, and polypharmacy that are more commonly occurring at younger ages. The aim of this review is to revisit fundamental differences in child–adult thermoregulation in the face of these multifaceted climate challenges, address emerging concerns, and emphasize risk reduction strategies for the health and performance of children in the heat.
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Affiliation(s)
- Caroline J Smith
- Department of Health and Exercise Science, Appalachian State University, Boone, NC 28608, USA.
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