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Desai SA, Mirza UA, Mueller PJ. Influence of sex and sedentary conditions on sympathetic burst characteristics in prepubertal, postpubertal, and young adult rats. J Appl Physiol (1985) 2024; 136:1170-1181. [PMID: 38511214 DOI: 10.1152/japplphysiol.00649.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 03/07/2024] [Accepted: 03/15/2024] [Indexed: 03/22/2024] Open
Abstract
Recent evidence indicates that sex-based differences in cardiovascular disease (CVD) begin early in life, particularly when associated with risk factors such as a sedentary lifestyle. CVD is associated with elevated sympathetic nerve activity (SNA), quantified as increased SNA burst activity in humans. Whether burst characteristics are influenced by sex or sedentary conditions at younger ages is unknown. The purpose of our study is to compare SNA bursts in active and sedentary female and male rats at ages including prepuberty and young adulthood. We hypothesized that burst characteristics and blood pressure are higher under sedentary conditions and lower in female rats compared with males. We analyzed splanchnic SNA (SpSNA) recordings from Inactin-anesthetized male and female rats at 4-, 8-, and 16-wk of age. Physically active and sedentary rats were each housed in separate, environmentally controlled chambers where physically active rats had free access to an in-cage running wheel. Sympathetic bursts were obtained by rectifying and integrating the raw SpSNA signal. Burst frequency, burst height, and burst width were calculated using the Peak Parameters extension in LabChart. Our results showed that sedentary conditions produced a greater burst width in 8- and 16-wk-old rats compared with 4-wk-old rats in both males and females (P < 0.001 for both). Burst frequency and incidence were both higher in 16-wk-old males compared with 16-wk-old females (P < 0.001 for both). Our results suggest that there are sedentary lifestyle- and sex-related mechanisms that impact sympathetic regulation of blood pressure at ages that range from prepuberty into young adulthood.NEW & NOTEWORTHY The mechanisms of decreased incidence of cardiovascular disease (CVD) in reproductive-age women compared with age-matched men are unknown. The strong association between elevated sympathetic activity and CVD led us to characterize splanchnic sympathetic bursts in female and male rats. Prepubescent males and females exhibited narrower sympathetic bursts, whereas young adult males had higher resting burst frequency compared with age-matched females. Sex-based regulation of sympathetic activity suggests a need for sex-dependent therapeutic strategies to combat CVD.
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Affiliation(s)
- Shivansh A Desai
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan, United States
| | - Umme Aiman Mirza
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan, United States
| | - Patrick J Mueller
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan, United States
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Emans TW, Moraes DJA, Ben-Tal A, Barrett CJ, Paton JFR, McBryde FD. Forgotten Circulation: Reduced Mesenteric Venous Capacitance in Hypertensive Rats Is Improved by Decreasing Sympathetic Activity. Hypertension 2024; 81:823-835. [PMID: 38380519 DOI: 10.1161/hypertensionaha.123.21878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 02/06/2024] [Indexed: 02/22/2024]
Abstract
BACKGROUND The mesenteric venous reservoir plays a vital role in mediating blood volume and pressure changes and is richly innervated by sympathetic nerves; however, the precise nature of venous sympathetic regulation and its role during hypertension remains unclear. We hypothesized that sympathetic drive to mesenteric veins in spontaneously hypertensive (SH) rats is raised, increasing mean circulatory filling pressure (MCFP), and impairing mesenteric capacitance. METHODS Arterial pressure, central venous pressure, mesenteric arterial, and venous blood flow were measured simultaneously in conscious male Wistar and SH rats. MCFP was assessed using an intraatrial balloon. Hemodynamic responses to volume changes (±20%) were measured before and after ganglionic blockade and carotid body denervation. Sympathetic venoconstrictor activity was measured in situ. RESULTS MCFP in vivo (10.8±1.6 versus 8.0±2.1 mm Hg; P=0.0005) and sympathetic venoconstrictor drive in situ (18±1 versus 10±2 µV; P<0.0001) were higher in SH rats; MCFP decreased in SH rats after hexamethonium and carotid body denervation (7.6±1.4; P<0.0001 and 8.5±1.0 mm Hg; P=0.0045). During volume changes, arterial pressure remained stable. With blood loss, net efflux of blood from the mesenteric bed was measured in both strains. However, during volume infusion, we observed net influx in Wistar (+2.3±2.6 mL/min) but efflux in SH rats (-1.0±1.0 mL/min; P=0.0032); this counterintuitive efflux was abolished by hexamethonium and carotid body denervation (+0.3±1.7 and 0.5±1.6 mL/min, respectively). CONCLUSIONS In SH rats, excessive sympathetic venoconstriction elevates MCFP and reduces capacitance, impairing volume buffering by mesenteric veins. We propose selective targeting of mesenteric veins through sympathetic drive reduction as a novel therapeutic opportunity for hypertension.
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Affiliation(s)
- Tonja W Emans
- Manaaki Manawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand (T.W.E., A.B.-T., C.J.B., J.F.R.P., F.D.M.)
| | - Davi J A Moraes
- Department of Physiology and Biophysics, Biomedical Sciences Institute, University of São Paulo, Brazil (D.J.A.M.)
| | - Alona Ben-Tal
- Manaaki Manawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand (T.W.E., A.B.-T., C.J.B., J.F.R.P., F.D.M.)
- Insightful Modelling Limited, Auckland, New Zealand (A.B.-T.)
| | - Carolyn J Barrett
- Manaaki Manawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand (T.W.E., A.B.-T., C.J.B., J.F.R.P., F.D.M.)
| | - Julian F R Paton
- Manaaki Manawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand (T.W.E., A.B.-T., C.J.B., J.F.R.P., F.D.M.)
| | - Fiona D McBryde
- Manaaki Manawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand (T.W.E., A.B.-T., C.J.B., J.F.R.P., F.D.M.)
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Papadopoulos GE, Balomenou F, Sakellariou XM, Tassopoulos C, Nikas DN, Giapros V, Kolettis TM. Autonomic Function in Obese Children and Adolescents: Systematic Review and Meta-Analysis. J Clin Med 2024; 13:1854. [PMID: 38610619 PMCID: PMC11012290 DOI: 10.3390/jcm13071854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 03/02/2024] [Accepted: 03/21/2024] [Indexed: 04/14/2024] Open
Abstract
Background: Obesity is invariably accompanied by autonomic dysfunction, although data in pediatric populations are conflicting. Methods: We conducted a systematic review and meta-analysis of 12 studies (totaling 1102 participants) comparing obese and normal-weight subjects (5-18 years of age), defined as body mass index >95th or <85th percentile, respectively. Using a random-effects model, we report the standardized mean differences (SMD) of sympathetic and vagal indices of heart rate variability. Results: Autonomic dysfunction was present in the obesity group, based on the average SMD in the standard deviation of sinus intervals (at -0.5340), and on the ratio of low (LF)- to high (HF)-frequency spectra (at 0.5735). There was no difference in sympathetic activity, but the heterogeneity among the relevant studies weakens this result. SMD in HF (at 0.5876), in the root mean square of successive differences between intervals (at -0.6333), and in the number of times successive intervals exceeded 50 ms divided by the total number of intervals (at -0.5867) indicated lower vagal activity in the obesity group. Conclusions: Autonomic dysfunction is present in obese children and adolescents, attributed to lower vagal activity. Further studies are needed in various pediatric cohorts, placing emphasis on sympathetic activity.
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Affiliation(s)
- Georgios E. Papadopoulos
- Department of Cardiology, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (G.E.P.); (X.M.S.); (C.T.); (D.N.N.)
| | - Foteini Balomenou
- Department of Child Health, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (F.B.); (V.G.)
| | - Xenofon M. Sakellariou
- Department of Cardiology, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (G.E.P.); (X.M.S.); (C.T.); (D.N.N.)
| | - Christos Tassopoulos
- Department of Cardiology, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (G.E.P.); (X.M.S.); (C.T.); (D.N.N.)
| | - Dimitrios N. Nikas
- Department of Cardiology, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (G.E.P.); (X.M.S.); (C.T.); (D.N.N.)
| | - Vasileios Giapros
- Department of Child Health, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (F.B.); (V.G.)
| | - Theofilos M. Kolettis
- Department of Cardiology, Faculty of Medicine, University of Ioannina, 45110 Ioannina, Greece; (G.E.P.); (X.M.S.); (C.T.); (D.N.N.)
- Cardiovascular Research Institute, 45110 Ioannina, Greece
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Ho AVT, Øvensen E, Lilja D, Toska K, Grenager O, Kristiansen K, Wesche J. Changes in electrodermal activity following sympathicotomy in hyperhidrosis patients. Front Surg 2024; 11:1358357. [PMID: 38529470 PMCID: PMC10961364 DOI: 10.3389/fsurg.2024.1358357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 02/22/2024] [Indexed: 03/27/2024] Open
Abstract
Objectives The aim of this study was to assess the potential of electrodermal activity (EDA) as a diagnostic tool for preoperative evaluation in hyperhidrosis patients. EDA levels and patterns in different skin areas were investigated before and after endoscopic thoracic sympathicotomy (ETS) and was compared to healthy subjects. Methods Thirty-seven patients underwent two days of measurements before and after the operation. Twenty-five (67.5%) of the patients also had a third measurement after six months. Non-invasive EDA measurements, involving skin conductance, were sampled from five different skin areas while patients were at rest in supine and sitting positions or when subjected to stimuli such as deep inspirations, mental challenge, and exposure to a sudden loud sound. Results Prior to the operation, hyperhidrosis patients showed higher spontaneous palm EDA variations at rest and stronger responses to stimuli compared to healthy subjects. Patients with facial blushing/hyperhidrosis or combined facial/palmar hyperhidrosis showed minimal spontaneous activity or responses, particularly during mental challenge and sound stimulus. Notably, palm EDA response was abolished shortly following sympathicotomy, although a minor response was observed after six months. Minimal EDA responses were also observed in the back and abdomen postoperatively. Conclusion Hyperhidrosis patients showed stronger EDA response to stimuli compared to healthy subjects. Sympathicotomy resulted in the complete elimination of palm EDA responses, gradually returning to a limited extent after six months. These findings suggest that EDA recordings could be utilized in preoperative assessment of hyperhidrosis patients.
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Affiliation(s)
- Ai Van Thuy Ho
- The Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Thoracic and Vascular Surgery, Akershus University Hospital, Lørenskog, Norway
| | - Eirik Øvensen
- Department of Thoracic and Vascular Surgery, Akershus University Hospital, Lørenskog, Norway
| | - Didrik Lilja
- The Intervention Centre, Oslo University Hospital, Oslo, Norway
| | - Karin Toska
- The Faculty of Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Odd Grenager
- Department of Thoracic and Vascular Surgery, Akershus University Hospital, Lørenskog, Norway
| | - Knut Kristiansen
- Department of Thoracic and Vascular Surgery, Akershus University Hospital, Lørenskog, Norway
| | - Jarlis Wesche
- The Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Thoracic and Vascular Surgery, Akershus University Hospital, Lørenskog, Norway
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Lin HC, Yen CM, Chen WS, Hsu CC, Kung YY, Wu JH, Su YT, Chen KF, Chen HY, Lien CM, Wang MJ, Chang CM. Unveiling the age-related dynamics in Sjögren's syndrome: Insights from heart rate variability and autonomic function. Int J Rheum Dis 2024; 27:e15088. [PMID: 38454192 DOI: 10.1111/1756-185x.15088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/22/2024] [Accepted: 02/05/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Sjögren's Syndrome (SS), mainly affecting women in their midlife, is characterized by persistent inflammation in glands producing tears and saliva, often leading to significant complications. This study investigates the differences in autonomic system functioning between individuals with SS and healthy controls. METHODS From April 2019 to December 2022, 329 diagnosed primary SS (pSS) patients and 30 healthy controls were enrolled at Taipei Veterans General Hospital, Taipei, Taiwan. The study assessed autonomic nervous system functioning using various HRV metrics. Participants were divided based on age and AECG criteria, including salivary gland biopsy and autoantibody status. RESULTS Significant differences in Heart Rate Variability (HRV) were observed between pSS patients and healthy controls. The total power index was notably lower in pSS patients (4.98 ± 1.29) than in controls (5.54 ± 1.21, p = .022). Additionally, Vagal (VAG) activity was significantly reduced in the pSS group (4.95 ± 1.33) compared to the healthy control group (5.47 ± 1.19, p = .041). Age-stratified analysis highlighted that the ≤50 years pSS group had a higher heart rate (77.74 ± 10.42) compared to the >50 years group (73.86 ± 10.35, p = .005). This group also showed a higher total power index (5.78 ± 1.30) versus the >50 years group (4.68 ± 1.19, p < .001), and significantly lower VAG activity (4.70 ± 1.26, p = .007) compared to healthy controls. Furthermore, the Standard Deviation of Normal-to-Normal Intervals (SDNN) was greater in the ≤50 years SS group (44.45 ± 37.12) than in the >50 years group (33.51 ± 26.18, p = .007). In pSS patients, those positive for both salivary gland biopsy and autoantibodies demonstrated a lower Total Power (4.25 ± 1.32) and R-wave validity (93.50 ± 4.79, p < .05) than other groups, suggesting more severe autonomic imbalance. The R-R interval variation (RRIV) was also significantly higher in this dual-positive group (696.10 ± 975.41, p < .05). Additionally, the ESSPRI for dryness was markedly higher in the dual-positive group (8.10 ± 1.45, p < .05), indicating more severe symptoms. These findings reveal significant variations in autonomic function in SS patients, especially in those with dual-positive biopsy and autoantibody status. CONCLUSION This study demonstrates significant autonomic dysfunction in pSS patients compared to healthy controls, particularly in those positive for both salivary gland biopsy and autoantibodies. The age-stratified analysis further emphasizes the impact of aging on autonomic system functioning in pSS, suggesting a need for age-specific management approaches in pSS patient care.
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Affiliation(s)
- Hong-Chun Lin
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Traditional Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Chien-Ming Yen
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Wei-Sheng Chen
- Division of Allergy, Immunology and Rheumatology, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Chih-Chien Hsu
- School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yen-Ying Kung
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Traditional Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Jin-Huang Wu
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yu-Ting Su
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Kuo-Feng Chen
- Department of Chinese Medicine, Taipei Municipal Gan-Dau Hospital, Taipei, Taiwan
| | - Hsin-Yuan Chen
- Center for Traditional Chinese Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Chien-Min Lien
- Institute of Traditional Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Section of Rehabilitation and Integrative Medicine, National Taiwan University Veterinary Hospital, Taipei, Taiwan
| | - Ming-Jen Wang
- Institute of Traditional Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Chinese Medicine, Taipei City Hospital Renai Branch, Taipei, Taiwan
| | - Ching-Mao Chang
- Center for Traditional Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Traditional Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
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Wang W, Sun JC, Ye P, Tan X, Gao Y, Duan W, Wang YK, Wang WZ. miR-22-3p in the rostral ventrolateral medulla promotes hypertension through inhibiting β-arrestin-1. J Physiol 2024; 602:317-332. [PMID: 38152023 DOI: 10.1113/jp283960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 12/05/2023] [Indexed: 12/29/2023] Open
Abstract
It has been documented that increased sympathetic activity contributes to the development of cardiovascular diseases, such as hypertension. We previously reported that β-arrestin-1, a multifunctional cytoskeletal protein, was downregulated in the rostral ventrolateral medulla (RVLM) of the spontaneously hypertensive rat (SHR), and its overexpression elicited an inhibitory effect on sympathetic activity in hypertension. microRNA (miR)-22-3p has been reported to be associated with the pathological progress of hypertension. The purpose of this study was to determine the role of miR-22-3p in β-arrestin-1-mediated central cardiovascular regulation in hypertension. It was observed that miR-22-3p was upregulated in the RVLM of SHRs compared with normotensive Wistar-Kyoto (WKY) rats, and it was subsequently confirmed to target the β-arrestin-1 gene using a dual-luciferase reporter assay. miR-22-3p was downregulated in the RVLM using adeno-associated virus with 'tough decoys', which caused a significant increase of β-arrestin-1 expression and decrease of noradrenaline and blood pressure (BP) in SHRs. However, upregulation of miR-22-3p using lentivirus in the RVLM of WKY rats significantly increased BP. In in vitro PC12 cells, enhanced oxidative stress activity induced by angiotensin II was counteracted by pretreatment with miR-22-3p inhibitor, and this effect could be abolished by β-arrestin-1 gene knockdown. Furthermore, microglia exhaustion significantly diminished miR-22-3p expression, and enhanced β-arrestin-1 expression in the RVLM of SHRs. Activation of BV2 cells in vitro evoked a significant increase of miR-22-3p expression, and this BV2 cell culture medium was also able to facilitate miR-22-3p expression in PC12 cells. Collectively, our findings support a critical role for microglia-derived miR-22-3p in inhibiting β-arrestin-1 in the RVLM, which is involved in central cardiovascular regulation in hypertension. KEY POINTS: Impairment of β-arrestin-1 function in the rostral ventrolateral medulla (RVLM) has been reported to be associated with the development of sympathetic overactivity in hypertension. However, little is known about the potential mechanisms of β-arrestin-1 dysfunction in hypertension. miR-22-3p is implicated in multiple biological processes, but the role of miR-22-3p in central regulation of cardiovascular activity in hypertension remains unknown. We predicted that miR-22-3p could directly bind to the β-arrestin-1 gene (Arrb1), and this hypothesis was confirmed by using a dual-luciferase reporter assay. Inhibition of β-arrestin-1 by miR-22-3p was further verified in both in vivo and in vitro experiments. Furthermore, our results suggested miR-22-3p as a risk factor for oxidative stress in the RVLM, thus contributing to sympatho-excitation and hypertension. Our present study provides evidence that microglia-derived miR-22-3p may underlie the pathogenesis and progression of neuronal hypertension by inhibiting β-arrestin-1 in the RVLM.
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Affiliation(s)
- Wen Wang
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Jia-Cen Sun
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Peng Ye
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Xing Tan
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Yuan Gao
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Wei Duan
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Yang-Kai Wang
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
| | - Wei-Zhong Wang
- Department of Marine Biomedicine and Polar Medicine, Naval Medical Center, Naval Medical University (Second Military Medical University), Shanghai, China
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Berry AC, Stute NL. Is the exercise pressor reflex under pressure? J Physiol 2023; 601:5589-5590. [PMID: 37963012 DOI: 10.1113/jp285682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 10/17/2023] [Indexed: 11/16/2023] Open
Affiliation(s)
- Alexander C Berry
- Muscle Physiology Laboratory, Auburn University, Auburn, Alabama, USA
| | - Nina L Stute
- Neurovascular Physiology Laboratory, Auburn University, Auburn, Alabama, USA
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Mouchtouri ET, Konstantinou T, Lekkas P, Lianopoulou A, Kotsaridou Z, Mourouzis I, Pantos C, Kolettis TM. Endothelin Modulates Rhythm Disturbances and Autonomic Responses to Acute Emotional Stress in Rats. Biology (Basel) 2023; 12:1401. [PMID: 37998000 PMCID: PMC10669295 DOI: 10.3390/biology12111401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/11/2023] [Accepted: 11/03/2023] [Indexed: 11/25/2023]
Abstract
The ubiquitous peptide endothelin is currently under investigation as a modulatory factor of autonomic responses to acute emotional stress. Baseline plasma levels of endothelin alter blood pressure responses, but it remains unclear whether autonomic activity and arrhythmogenesis (i.e., brady- or tachyarrhythmias) are affected. We recorded sympathetic and vagal indices (derived from heart rate variability analysis), rhythm disturbances, voluntary motion, and systolic blood pressure after acute emotional stress in conscious rats with implanted telemetry devices. Two strains were compared, namely wild-type and ETB-deficient rats, the latter displaying elevated plasma endothelin. No differences in heart rate or blood pressure were evident, but sympathetic responses were blunted in ETB-deficient rats, contrasting prompt activation in wild-type rats. Vagal withdrawal was observed in both strains at the onset of stress, but vagal activity was subsequently restored in ETB-deficient rats, accompanied by low voluntary motion during recovery. Reflecting such distinct autonomic patterns, frequent premature ventricular contractions were recorded in wild-type rats, as opposed to sinus pauses in ETB-deficient rats. Thus, chronically elevated plasma endothelin levels blunt autonomic responses to acute emotional stress, resulting in vagal dominance and bradyarrhythmias. Our study provides further insights into the pathophysiology of stress-induced tachyarrhythmias and syncope.
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Affiliation(s)
- Eleni-Taxiarchia Mouchtouri
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
| | - Thomas Konstantinou
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
| | | | - Alexandra Lianopoulou
- School of Applied Biology and Biotechnology, Agricultural University of Athens, 10447 Athens, Greece; (A.L.); (Z.K.)
| | - Zoi Kotsaridou
- School of Applied Biology and Biotechnology, Agricultural University of Athens, 10447 Athens, Greece; (A.L.); (Z.K.)
| | - Iordanis Mourouzis
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece; (I.M.); (C.P.)
| | - Constantinos Pantos
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece; (I.M.); (C.P.)
| | - Theofilos M. Kolettis
- Department of Cardiology, Medical School, University of Ioannina, 45500 Ioannina, Greece; (E.-T.M.); (T.K.)
- Cardiovascular Research Institute, 45500 Ioannina, Greece;
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Heusser K, Tank J, Diedrich A, Fischer A, Heise T, Jordan J. Randomized Trial Comparing SGLT2 Inhibition and Hydrochlorothiazide on Sympathetic Traffic in Type 2 Diabetes. Kidney Int Rep 2023; 8:2254-2264. [PMID: 38025218 PMCID: PMC10658269 DOI: 10.1016/j.ekir.2023.08.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/24/2023] [Accepted: 08/28/2023] [Indexed: 12/01/2023] Open
Abstract
Introduction Reductions in sympathetic nervous system activity may contribute to beneficial effects of sodium glucose cotransporter 2 (SGLT2) inhibition on cardiovascular outcomes. Therefore, we tested the hypothesis that SGLT2 inhibition with empagliflozin (Empa) lowers muscle sympathetic nerve activity (MSNA) in patients with type 2 diabetes mellitus (T2DM) compared with hydrochlorothiazide (HCT) to discern SGLT2-specific actions from responses to increased natriuresis. Methods We randomized patients with T2DM on metformin monotherapy to either 25 mg/d Empa (n = 20) or 25 mg/d HCT (n = 21) for 6 weeks in a parallel, double-blind fashion. We assessed MSNA by peroneal microneurography, blood pressure, cardiovascular and metabolic biomarkers at baseline and at the end of treatment. Results Both drugs elicited volume depletion, as indicated by increased thoracic impedance. Compared with HCT, Empa caused 1.23 kg more body weight loss (P = 0.011) and improved glycemic control. Seated systolic blood pressure decreased with both treatments (P < 0.002). MSNA did not change significantly with either treatment; however, MSNA changes were negatively correlated with changes in body weight on Empa (P = 0.042) and on HCT(P = 0.001). The relationship was shifted to lower MSNA on Empa compared with HCT (P = 0.002). Conclusion Increased renal sodium excretion eliciting body weight loss may promote sympathetic activation. However, sympathetic excitation in the face of increased sodium loss may be attenuated by SGLT2 inhibitor-specific actions.
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Affiliation(s)
- Karsten Heusser
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
| | - Jens Tank
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
| | - André Diedrich
- Vanderbilt Autonomic Dysfunction Center, Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA
- Department of Biomedical Engineering, School of Engineering, Vanderbilt University, Nashville, Tennessee, USA
| | | | | | - Jens Jordan
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
- Medical Faculty, University of Cologne, Cologne, Germany
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Zoccal DB. Understanding the hypothalamic-brainstem bridge in the hypoxia puzzle. J Physiol 2023; 601:4243-4244. [PMID: 37698923 DOI: 10.1113/jp285387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/14/2023] Open
Affiliation(s)
- Daniel B Zoccal
- Department of Physiology and Pathology, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, Brazil
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11
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Faria D, Moll-Bernardes R, Testa L, Moniz CMV, Rodrigues EC, Mota JM, Souza FR, Alves MJNN, Ono BE, Izaias JE, Sales AO, Rodrigues TS, Salemi VMC, Jordão CP, De Angelis K, Craighead DH, Rossman MJ, Bortolotto LA, Consolim-Colombo FM, Irigoyen MCC, Seals DR, Negrão CE, Sales ARK. Neurovascular and hemodynamic responses to mental stress and exercise in severe COVID-19 survivors. Am J Physiol Regul Integr Comp Physiol 2023; 325:R269-R279. [PMID: 37449870 PMCID: PMC10625836 DOI: 10.1152/ajpregu.00111.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/27/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
Previous studies show that COVID-19 survivors have elevated muscle sympathetic nerve activity (MSNA), endothelial dysfunction, and aortic stiffening. However, the neurovascular responses to mental stress and exercise are still unexplored. We hypothesized that COVID-19 survivors, compared with age- and body mass index (BMI)-matched control subjects, exhibit abnormal neurovascular responses to mental stress and physical exercise. Fifteen severe COVID-19 survivors (aged: 49 ± 2 yr, BMI: 30 ± 1 kg/m2) and 15 well-matched control subjects (aged: 46 ± 3 yr, BMI: 29 ± 1 kg/m2) were studied. MSNA (microneurography), forearm blood flow (FBF), and forearm vascular conductance (FVC, venous occlusion plethysmography), mean arterial pressure (MAP, Finometer), and heart rate (HR, ECG) were measured during a 3-min mental stress (Stroop Color-Word Test) and during a 3-min isometric handgrip exercise (30% of maximal voluntary contraction). During mental stress, MSNA (frequency and incidence) responses were higher in COVID-19 survivors than in controls (P < 0.001), and FBF and FVC responses were attenuated (P < 0.05). MAP was similar between the groups (P > 0.05). In contrast, the MSNA (frequency and incidence) and FBF and FVC responses to handgrip exercise were similar between the groups (P > 0.05). MAP was lower in COVID-19 survivors (P < 0.05). COVID-19 survivors exhibit an exaggerated MSNA and blunted vasodilatory response to mental challenge compared with healthy adults. However, the neurovascular response to handgrip exercise is preserved in COVID-19 survivors. Overall, the abnormal neurovascular control in response to mental stress suggests that COVID-19 survivors may have an increased risk to cardiovascular events during mental challenge.
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Affiliation(s)
- Diego Faria
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | | | - Laura Testa
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - Camila M V Moniz
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - Erika C Rodrigues
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
| | - Jose M Mota
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - Francis R Souza
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Maria Janieire N N Alves
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Bruna E Ono
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - João E Izaias
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - Artur O Sales
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
| | - Thais S Rodrigues
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Vera M C Salemi
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Camila P Jordão
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Katia De Angelis
- Department of Physiology, Federal University of São Paulo, São Paulo, Brazil
| | - Daniel H Craighead
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Matthew J Rossman
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Luiz A Bortolotto
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Fernanda M Consolim-Colombo
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Maria C C Irigoyen
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Douglas R Seals
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Carlos E Negrão
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
- Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo, Brazil
| | - Allan R K Sales
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
- Instituto do Coração, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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12
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Wang Y, Anesi J, Maier MC, Myers MA, Oqueli E, Sobey CG, Drummond GR, Denton KM. Sympathetic Nervous System and Atherosclerosis. Int J Mol Sci 2023; 24:13132. [PMID: 37685939 PMCID: PMC10487841 DOI: 10.3390/ijms241713132] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 08/18/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023] Open
Abstract
Atherosclerosis is characterized by the narrowing of the arterial lumen due to subendothelial lipid accumulation, with hypercholesterolemia being a major risk factor. Despite the recent advances in effective lipid-lowering therapies, atherosclerosis remains the leading cause of mortality globally, highlighting the need for additional therapeutic strategies. Accumulating evidence suggests that the sympathetic nervous system plays an important role in atherosclerosis. In this article, we reviewed the sympathetic innervation in the vasculature, norepinephrine synthesis and metabolism, sympathetic activity measurement, and common signaling pathways of sympathetic activation. The focus of this paper was to review the effectiveness of pharmacological antagonists or agonists of adrenoceptors (α1, α2, β1, β2, and β3) and renal denervation on atherosclerosis. All five types of adrenoceptors are present in arterial blood vessels. α1 blockers inhibit atherosclerosis but increase the risk of heart failure while α2 agonism may protect against atherosclerosis and newer generations of β blockers and β3 agonists are promising therapies against atherosclerosis; however, new randomized controlled trials are warranted to investigate the effectiveness of these therapies in atherosclerosis inhibition and cardiovascular risk reduction in the future. The role of renal denervation in atherosclerosis inhibition in humans is yet to be established.
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Affiliation(s)
- Yutang Wang
- Discipline of Life Science, Institute of Innovation, Science and Sustainability, Federation University Australia, Ballarat, VIC 3350, Australia
| | - Jack Anesi
- Discipline of Life Science, Institute of Innovation, Science and Sustainability, Federation University Australia, Ballarat, VIC 3350, Australia
| | - Michelle C. Maier
- Discipline of Life Science, Institute of Innovation, Science and Sustainability, Federation University Australia, Ballarat, VIC 3350, Australia
| | - Mark A. Myers
- Discipline of Life Science, Institute of Innovation, Science and Sustainability, Federation University Australia, Ballarat, VIC 3350, Australia
| | - Ernesto Oqueli
- Cardiology Department, Grampians Health Ballarat, Ballarat, VIC 3350, Australia
- School of Medicine, Faculty of Health, Deakin University, Geelong, VIC 3216, Australia
| | - Christopher G. Sobey
- Centre for Cardiovascular Biology and Disease Research, Department of Microbiology, Anatomy, Physiology & Pharmacology, School of Agriculture, Biomedicine & Environment, La Trobe University, Melbourne, VIC 3086, Australia
| | - Grant R. Drummond
- Centre for Cardiovascular Biology and Disease Research, Department of Microbiology, Anatomy, Physiology & Pharmacology, School of Agriculture, Biomedicine & Environment, La Trobe University, Melbourne, VIC 3086, Australia
| | - Kate M. Denton
- Department of Physiology, Monash University, Melbourne, VIC 3800, Australia
- Cardiovascular Disease Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, VIC 3800, Australia
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Xu Y, Fei X, Fu H, Chen A, Zhu X, Zhang F, Han Y. Upregulated expression of a TOR2A gene product-salusin-β in the paraventricular nucleus enhances sympathetic activity and cardiac sympathetic afferent reflex in rats with chronic heart failure induced by coronary artery ligation. Acta Physiol (Oxf) 2023; 238:e13987. [PMID: 37183727 DOI: 10.1111/apha.13987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 04/17/2023] [Accepted: 05/12/2023] [Indexed: 05/16/2023]
Abstract
AIM Enhanced cardiac sympathetic afferent reflex (CSAR) promotes sympathetic hyperactivation in chronic heart failure (CHF). Salusin-β is a torsin family 2 member A (TOR2A) gene product and a cardiovascular active peptide closely associated with cardiovascular diseases. We aimed to determine the roles of salusin-β in the paraventricular nucleus (PVN) in modulating enhanced CSAR and sympathetic hyperactivation in rats with CHF induced by coronary artery ligation and elucidate the underlying molecular mechanisms. METHODS CSAR was evaluated based on the responses of mean arterial pressure (MAP) and renal sympathetic nerve activity (RSNA) to the epicardial administration of capsaicin in rats under anesthesia. RESULTS Salusin-β protein expression was upregulated in the PVN of the CHF compared with sham-operated rats. Salusin-β microinjection into the PVN dose-dependently increased MAP and RSNA and enhanced CSAR, while anti-salusin-β IgG exerted opposite effects. The effect of salusin-β was inhibited by reactive oxygen species (ROS) scavenger or NAD(P)H oxidase inhibitor but promoted by superoxide dismutase inhibitor. The effect of anti-salusin-β IgG was interdicted by nitric oxide (NO) synthase inhibitor. Furthermore, chronic salusin-β gene knockdown in PVN attenuated CSAR, reduced sympathetic output, improved myocardial remodeling and cardiac function, decreased NAD(P)H oxidase activity and ROS levels, and increased NO levels in the CHF rats. CONCLUSION Increased salusin-β activity in the PVN contributes to sympathetic hyperactivation and CSAR in CHF by inhibiting NO release and stimulating NAD(P)H oxidase-ROS production. Reducing endogenous central salusin-β expression might be a novel strategy for preventing and treating CHF in the future.
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Affiliation(s)
- Yu Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, and Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Xuejie Fei
- Department of Anesthesiology and Perioperative medicine, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation, Shanghai, China
| | - Hangjiang Fu
- Department of General Practice, Jinling Hospital, Nanjing, Jiangsu, China
| | - Aidong Chen
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, and Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Xinrui Zhu
- College of Physical Education and Health, East China Normal University, Shanghai, China
| | - Feng Zhang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, and Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Ying Han
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, and Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, China
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Fu LW, Gong YD, Nguyen AT, Guo ZL, Tjen-A-Looi SC, Malik S. Sympathoinhibitory electroacupuncture (EA) interacts positively with anti-inflammatory EA alleviating blood pressure in hypertensive rats. Front Cardiovasc Med 2023; 10:1140255. [PMID: 37324636 PMCID: PMC10262041 DOI: 10.3389/fcvm.2023.1140255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 05/12/2023] [Indexed: 06/17/2023] Open
Abstract
Elevated sympathetic activity and chronic inflammation are known contributory factors observed in hypertension. We have observed that sympathoinhibitory electroacupuncture (SI-EA) at acupoints ST36-37 alleviates sympathetic activity and hypertension. Additionally, EA at acupoints SP6-7 exerts anti-inflammatory (AI-EA) effects. However, it is not known whether simultaneous stimulation of this combination of acupoints attenuates or enhances individual effects. A 2 × 2 factorial design was used to test the hypothesis that combining SI-EA and AI-EA (cEA) leads to greater reduction of hypertension by decreasing sympathetic activity and inflammation in hypertensive rats than either set of acupoints alone. Dahl salt-sensitive hypertensive (DSSH) rats were treated with four EA regimens including cEA, SI-EA, AI-EA, and sham-EA twice weekly for five weeks. A group of normotensive (NTN) rats served as control. Systolic and diastolic BP (SBP and DBP) and heart rate (HR) were measured non-invasively by tail-cuff. Plasma norepinephrine (NE), high-sensitivity C-reactive protein (hs-CRP) and interleukin 6 (IL-6) concentrations were determined with ELISA at the completion of treatments. DSSH rats on high salt diet progressively developed moderate hypertension within five weeks. DSSH rats treated with sham-EA showed continuous increase in SBP and DBP and elevations in plasma NE, hs-CRP, and IL-6 levels relative to NTN control. Both SI-EA and cEA decreased SBP and DBP, and had corresponding changes in biomarkers (NE, hs-CRP, and IL-6) compared with sham-EA. AI-EA prevented SBP and DBP elevation and decreased IL-6 and hs-CRP relative to sham-EA. Importantly in DSSH rats that received repetitive cEA treatment, SI-EA interacted positively with AI-EA leading to greater reduction of SBP, DBP, NE, hs-CRP, and IL-6 than SI-EA or AI-EA alone. These data suggest that by targeting both elevated sympathetic activity and chronic inflammation, cEA regimen results in a greater reduction of BP effects in treating hypertension compared to using individual SI-EA or AI-EA alone.
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15
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Valenza G. Depression as a cardiovascular disorder: central-autonomic network, brain-heart axis, and vagal perspectives of low mood. Front Netw Physiol 2023; 3:1125495. [PMID: 37260560 PMCID: PMC10228690 DOI: 10.3389/fnetp.2023.1125495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 05/04/2023] [Indexed: 06/02/2023]
Abstract
If depressive symptoms are not caused by the physiological effects of a substance or other medical or neurological conditions, they are generally classified as mental disorders that target the central nervous system. However, recent evidence suggests that peripheral neural dynamics on cardiovascular control play a causal role in regulating and processing emotions. In this perspective, we explore the dynamics of the Central-Autonomic Network (CAN) and related brain-heart interplay (BHI), highlighting their psychophysiological correlates and clinical symptoms of depression. Thus, we suggest that depression may arise from dysregulated cardiac vagal and sympathovagal dynamics that lead to CAN and BHI dysfunctions. Therefore, treatments for depression should target the nervous system as a whole, with particular emphasis on regulating vagal and BHI dynamics.
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16
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Yan J, Tian M, Zhao Y, Bian R. Transcranial magnetic stimulation attenuates hypertension in spontaneously hypertensive rats. J Appl Physiol (1985) 2023; 134:1450-1455. [PMID: 37078504 DOI: 10.1152/japplphysiol.00665.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2023] Open
Abstract
Repetitive transcranial magnetic stimulation (TMS) is of two types, including continuous theta-burst stimulation (cTBS) and intermittent theta-burst stimulation (iTBS), which is currently applied in various neuropsychiatric disorders. The present study aimed to explore the effect of cTBS and iTBS on hypertension and the mechanism using spontaneously hypertensive rat (SHR) and Wistar-Kyoto (WKY) rat models. Norepinephrine and epinephrine levels were determined using enzyme immunoassay kits. 60%, 80% and 100% of the motor threshold were used for stimulation. The systolic blood pressure (SBP, 168±3 vs. 189±3 mm Hg), diastolic blood pressure (DBP, 134±5 vs. 158±4 mm Hg) and mean artery pressure (MAP, 146±3 vs. 170±3 mm Hg) were attenuated after cTBS (100%) stimulation on T4 of SHR. The SBP (165±4 vs. 189±3 mm Hg), DBP (136±4 vs. 159±2 mm Hg) and MAP (146±3 vs. 169±2 mm Hg) were alleviated after cTBS (100%) stimulation on L2. The blood pressure was also attenuated after iTBS (100%) stimulation on T4 or L2 of SHR. The stimulation of cTBS or iTBS on S2 spinal column did not affect the blood pressure of SHR rats. The stimulation of cTBS or iTBS has no effect on the blood pressure in WKY rats. Norepinephrine and epinephrine levels in the SHR rat kidneys were reduced after cTBS or iTBS stimulation on T4 and L2. These results indicated that TMS attenuates hypertension after spinal column stimulation via reduction of catecholamines. Thus treatment with TMS may be a strategy for hypertension therapy in the future.
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Affiliation(s)
- Jun Yan
- Rehabilitation Department, Shenzhen Hospital of Traditional Chinese and West Medicine, Shenzhen, Guangdong, China
| | - Mengchen Tian
- Department of Rehabilitation Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Ying Zhao
- The Affiliated Xuzhou Rehabilitation, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Rong Bian
- Department of Rehabilitation, Nanjing Medical University, Nanjing, China
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17
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Linder BA, Agostinelli PJ, Bordonie NC, Stute NL. Turn up and burn up: aerobic exercise training as a strategy to preserve non-shivering thermogenesis on an obesogenic diet. J Physiol 2023; 601:1179-1181. [PMID: 36815729 PMCID: PMC10149049 DOI: 10.1113/jp284459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 02/20/2023] [Indexed: 02/24/2023] Open
Affiliation(s)
- Braxton A Linder
- Neurovascular Physiology Laboratory, Auburn University, Auburn, USA
| | | | | | - Nina L Stute
- Neurovascular Physiology Laboratory, Auburn University, Auburn, USA
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18
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Akins JD, Okada Y, Hendrix JM, Vongpatanasin W, Fu Q. Greater resting muscle sympathetic nerve activity reduces cold pressor autonomic reactivity in older women, but not older men. Am J Physiol Regul Integr Comp Physiol 2023; 324:R656-R665. [PMID: 36971420 PMCID: PMC10110704 DOI: 10.1152/ajpregu.00231.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 03/20/2023] [Accepted: 03/20/2023] [Indexed: 03/29/2023]
Abstract
Previous work demonstrates augmented muscle sympathetic nerve activity (MSNA) responses to the cold pressor test (CPT) in older women. Given its interindividual variability, however, the influence of baseline MSNA on CPT reactivity in older adults remains unknown. Sixty volunteers (60-83y; 30 women) completed testing where MSNA (microneurography), blood pressure (BP), and heart rate (HR) were recorded during baseline and a 2-min CPT (~4°C). Participant data were terciled by baseline MSNA (n=10/group); comparisons were made between the high baseline men (HM) and women (HW), and low baseline men (LM) and women (LW). By design, HM and HW, vs. LM and LW, had greater baseline MSNA burst frequency (37±5 and 38±3 vs. 9±4 and 15±5 bursts/min) and burst incidence (59±14 and 60±8 vs. 16±10 and 23±7 bursts/100hbs; both P<0.001). However, baseline BP and HR were not different between the groups (all P>0.05). During the CPT, there were no differences in the increase in BP and HR (all P>0.05). Conversely, ΔMSNA burst frequency was lower in HW vs. LW (8±9 vs. 22±12 bursts/min; P=0.012) yet was similar in HM vs. LM (17±12 vs. 19±10 bursts/min, P=0.994). Further, ΔMSNA burst incidence was lower in HW vs. LW (9±13 vs. 28±16 bursts/100hbs; P=0.020), with no differences between HM vs. LM (21±17 vs. 31±17 bursts/100hbs; P=0.455). Our findings suggest that heightened baseline activity in older women attenuates the typical CPT-mediated increase in MSNA without changing cardiovascular reactivity. While the underlying mechanisms remain unknown, altered sympathetic recruitment or neurovascular transduction may contribute to these disparate responses.
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Affiliation(s)
- John D Akins
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, TX, United States
- The University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Yoshiyuki Okada
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, TX, United States
- The University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Joseph M Hendrix
- The University of Texas Southwestern Medical Center, Dallas, TX, United States
| | | | - Qi Fu
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, TX, United States
- The University of Texas Southwestern Medical Center, Dallas, TX, United States
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Quarti-Trevano F, Dell’Oro R, Cuspidi C, Ambrosino P, Grassi G. Endothelial, Vascular and Sympathetic Alterations as Therapeutic Targets in Chronic Heart Failure. Biomedicines 2023; 11:803. [PMID: 36979781 PMCID: PMC10044749 DOI: 10.3390/biomedicines11030803] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 02/21/2023] [Accepted: 03/03/2023] [Indexed: 03/09/2023] Open
Abstract
Vascular and sympathetic abnormalities characterize chronic heart failure (CHF). Alterations include (1) a reduction in arterial distensibility, (2) endothelial dysfunction, (3) a decrease in arterial compliance and a parallel increase in arterial stiffness, and (4) sympathetic cardiovascular activation. Altogether, these alterations represent important targets in therapeutic interventions, because they display an independent negative impact on the disease prognosis, favouring disease progression and the development of cardiovascular complications with direct and indirect mechanisms. The present review will examine the effects of the different therapeutic interventions targeting the vascular/sympathetic alterations detected in CHF. Non-pharmacological, pharmacological and device-based treatments will be discussed in detail, highlighting the possible mechanisms responsible for the vascular/sympathetic effects of each intervention. Finally, the unmet goals in treatment in relation to endothelial and adrenergic targets will be also discussed.
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Affiliation(s)
- Fosca Quarti-Trevano
- Clinica Medica, School of Medicine and Surgery, University Milano-Bicocca, 20052 Monza, Italy
| | - Raffaella Dell’Oro
- Clinica Medica, School of Medicine and Surgery, University Milano-Bicocca, 20052 Monza, Italy
| | - Cesare Cuspidi
- Clinica Medica, School of Medicine and Surgery, University Milano-Bicocca, 20052 Monza, Italy
| | - Pasquale Ambrosino
- Istituti Clinici Scientifici Maugeri IRCCS, Directorate of Telese Terme Institute, 82037 Telese Terme, Italy
| | - Guido Grassi
- Clinica Medica, School of Medicine and Surgery, University Milano-Bicocca, 20052 Monza, Italy
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20
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Karlen-Amarante M, de Paula Leirão I, Katayama PL, Colombari E, Bittencourt-Silva PG, Menezes MF, B Zoccal D. Sympathetic dysregulation induced by postnatal intermittent hypoxia. Sleep 2023; 46:7067763. [PMID: 36864609 DOI: 10.1093/sleep/zsad055] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/26/2023] [Indexed: 03/04/2023] Open
Abstract
STUDY OBJECTIVES Exposure to postnatal chronic intermittent hypoxia (pCIH), as experienced in sleep-disordered breathing, is a risk factor for developing cardiorespiratory diseases in adulthood. pCIH causes respiratory instability and motor dysfunction that persist until adult life. In this study, we investigated the impact of pCIH on the sympathetic control of arterial pressure in rats. METHODS AND RESULTS Neonate male Holtzman rats (P0-1) were exposed to pCIH (6% O2 for 30 s, every 10 min, 8 h/day) during their first 10-15 days of life, while control animals were maintained under normoxia. In early adult life (P25-40), freely behaving pCIH animals (n=13) showed higher baseline arterial pressure levels linked to augmented sympathetic-mediated variability than control animals (n=12, P<0.05). Using decerebrated in situ preparations, we found that juvenile pCIH rats exhibited a two-fold increase in thoracic sympathetic nerve activity (n=14) and elevated firing frequency of ventromedullary presympathetic neurons (n=7) compared to control rats (n=6-7, P<0.05). This pCIH-induced sympathetic dysregulation was associated with increased HIF-1α (hypoxic inducible factor) mRNA expression in catecholaminergic pre-sympathetic neurons (n=5,P<0.05). At older age (P90-99), pCIH rats displayed higher arterial pressure levels and larger depressor responses to ganglionic blockade (n=6-8, P<0.05), confirming the sympathetic overactivity state. CONCLUSIONS pCIH facilitates the vasoconstrictor sympathetic drive by mechanisms associated with enhanced firing activity and HIF-1α expression in ventromedullary pre-sympathetic neurons. This excessive sympathetic activity persists until adulthood resulting in high blood pressure levels and variability, which contribute to developing cardiovascular diseases.
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Affiliation(s)
- Marlusa Karlen-Amarante
- current Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, USA.,Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Isabela de Paula Leirão
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Pedro L Katayama
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Eduardo Colombari
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Paloma G Bittencourt-Silva
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Miguel F Menezes
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
| | - Daniel B Zoccal
- Department of Physiology and Pathology, School of Dentistry, São Paulo State University, Araraquara, SP, Brazil
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21
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Faria D, Moll-Bernardes RJ, Testa L, Moniz CM, Rodrigues EC, Rodrigues AG, Araujo A, Alves MJ, Ono BE, Izaias JE, Salemi VM, Jordão CP, Amaro-Vicente G, Rondon MU, Ludwig KR, Craighead DH, Rossman MJ, Consolim-Colombo FM, De Angelis K, Irigoyen MC, Seals DR, Negrão CE, Sales AR. Sympathetic Neural Overdrive, Aortic Stiffening, Endothelial Dysfunction, and Impaired Exercise Capacity in Severe COVID-19 Survivors: A Mid-Term Study of Cardiovascular Sequelae. Hypertension 2023; 80:470-481. [PMID: 36416143 PMCID: PMC9847692 DOI: 10.1161/hypertensionaha.122.19958] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND COVID-19 has become a dramatic health problem during this century. In addition to high mortality rate, COVID-19 survivors are at increased risk for cardiovascular diseases 1-year after infection. Explanations for these manifestations are still unclear but can involve a constellation of biological alterations. We hypothesized that COVID-19 survivors compared with controls exhibit sympathetic overdrive, vascular dysfunction, cardiac morpho-functional changes, impaired exercise capacity, and increased oxidative stress. METHODS Nineteen severe COVID-19 survivors and 19 well-matched controls completed the study. Muscle sympathetic nerve activity (microneurography), brachial artery flow-mediated dilation and blood flow (Doppler-Ultrasound), carotid-femoral pulse wave velocity (Complior), cardiac morpho-functional parameters (echocardiography), peak oxygen uptake (cardiopulmonary exercise testing), and oxidative stress were measured ~3 months after hospital discharge. Complementary experiments were conducted on human umbilical vein endothelial cells cultured with plasma samples from subjects. RESULTS Muscle sympathetic nerve activity and carotid-femoral pulse wave velocity were greater and brachial artery flow-mediated dilation, brachial artery blood flow, E/e' ratio, and peak oxygen uptake were lower in COVID-19 survivors than in controls. COVID-19 survivors had lower circulating antioxidant markers compared with controls, but there were no differences in plasma-treated human umbilical vein endothelial cells nitric oxide production and reactive oxygen species bioactivity. Diminished peak oxygen uptake was associated with sympathetic overdrive, vascular dysfunction, and reduced diastolic function in COVID-19 survivors. CONCLUSIONS Our study revealed that COVID-19 survivors have sympathetic overactivation, vascular dysfunction, cardiac morpho-functional changes, and reduced exercise capacity. These findings indicate the need for further investigation to determine whether these manifestations are persistent longer-term and their impact on the cardiovascular health of COVID-19 survivors.
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Affiliation(s)
- Diego Faria
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.).,D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.)
| | - Renata J. Moll-Bernardes
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.)
| | - Laura Testa
- D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.)
| | - Camila M.V. Moniz
- D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.)
| | - Erika C. Rodrigues
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.)
| | - Amanda G. Rodrigues
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Amanda Araujo
- Department of Physiology, Federal University of São Paulo (UNIFESP), Brazil (A.A., K.D.A.)
| | - Maria J.N.N. Alves
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Bruna E. Ono
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.).,D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.)
| | - João E. Izaias
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.).,D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.)
| | - Vera M.C. Salemi
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Camila P. Jordão
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Graziela Amaro-Vicente
- School of Physical Education and Sport, University of São Paulo, Brazil (G.A.-V., M.U.P.B.R., C.E.N.)
| | - Maria U.P.B. Rondon
- School of Physical Education and Sport, University of São Paulo, Brazil (G.A.-V., M.U.P.B.R., C.E.N.)
| | - Katelyn R. Ludwig
- Department of Integrative Physiology, University of Colorado Boulder, CO (K.R.L., D.H.C., M.J.R., D.R.S.)
| | - Daniel H. Craighead
- Department of Integrative Physiology, University of Colorado Boulder, CO (K.R.L., D.H.C., M.J.R., D.R.S.)
| | - Matthew J. Rossman
- Department of Integrative Physiology, University of Colorado Boulder, CO (K.R.L., D.H.C., M.J.R., D.R.S.)
| | - Fernanda M. Consolim-Colombo
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Katia De Angelis
- Department of Physiology, Federal University of São Paulo (UNIFESP), Brazil (A.A., K.D.A.)
| | - Maria C.C. Irigoyen
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
| | - Douglas R. Seals
- Department of Integrative Physiology, University of Colorado Boulder, CO (K.R.L., D.H.C., M.J.R., D.R.S.)
| | - Carlos E. Negrão
- Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.).,School of Physical Education and Sport, University of São Paulo, Brazil (G.A.-V., M.U.P.B.R., C.E.N.)
| | - Allan R.K. Sales
- D’Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil (D.F., R.J.M.-B., E.C.R., B.E.O., J.E.I., A.R.K.S.).,D’Or Institute for Research and Education (IDOR), São Paulo, Brazil (D.F., L.T., C.M.V.M., B.E.O., J.E.I., A.R.K.S.).,Instituto do Coração, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Brazil (A.G.R., M.J.N.N.A., V.M.C.S., C.P.J., F.M.C.-C., M.C.C.I., C.E.N., A.R.K.S.)
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22
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Kantauskaite M, Vonend O, Yakoub M, Heilmann P, Maifeld A, Minko P, Schimmöller L, Antoch G, Müller DN, Schmidt C, Duvnjak B, Zierhut U, Potthoff SA, Rump LC, Fischer JC, Stegbauer J. The Effect of Renal Denervation on T Cells in Patients with Resistant Hypertension. Int J Mol Sci 2023; 24. [PMID: 36768814 DOI: 10.3390/ijms24032493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 01/21/2023] [Accepted: 01/23/2023] [Indexed: 02/03/2023] Open
Abstract
(1) Background: Sympathetic overactivity is a major contributor to resistant hypertension (RH). According to animal studies, sympathetic overactivity increases immune responses, thereby aggravating hypertension and cardiovascular outcomes. Renal denervation (RDN) reduces sympathetic nerve activity in RH. Here, we investigate the effect of RDN on T-cell signatures in RH. (2) Methods: Systemic inflammation and T-cell subsets were analyzed in 17 healthy individuals and 30 patients with RH at baseline and 6 months after RDN. (3) Results: The patients with RH demonstrated higher levels of pro-inflammatory cytokines and higher frequencies of CD4+ effector memory (TEM), CD4+ effector memory residential (TEMRA) and CD8+ central memory (TCM) cells than the controls. After RDN, systolic automated office blood pressure (BP) decreased by -17.6 ± 18.9 mmHg. Greater BP reductions were associated with higher CD4+ TEM (r -0.421, p = 0.02) and CD8+ TCM (r -0.424, p = 0.02) frequencies at baseline. The RDN responders, that is, the patients with ≥10mmHg systolic BP reduction, showed reduced pro-inflammatory cytokine levels, whereas the non-responders had unchanged inflammatory activity and higher CD8+ TEMRA frequencies with increased cellular cytokine production. (4) Conclusions: The pro-inflammatory state of patients with RH is characterized by altered T-cell signatures, especially in non-responders. A detailed analysis of T cells might be useful in selecting patients for RDN.
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23
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Heusser K, Tank J, Diedrich A, Fischer A, Heise T, Jordan J. Limited evidence for sympathetic neural overactivation in older patients with type 2 diabetes mellitus. Front Neurosci 2023; 16:1107752. [PMID: 36711125 PMCID: PMC9878600 DOI: 10.3389/fnins.2022.1107752] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 12/30/2022] [Indexed: 01/13/2023] Open
Abstract
Introduction Mechanistic studies suggested that excess sympathetic activity promotes arterial hypertension while worsening insulin sensitivity. Older patients with type 2 diabetes are at particularly high cardiovascular and metabolic risk. However, data on sympathetic activity in this population is scarce. Methods We studied 61 patients with type 2 diabetes mellitus (22 women, 60.9 ± 1.4 years; 39 men, 60.9 ± 1.4 years). They had to have diabetes for at least 2 years, a hemoglobin A1c of 6.5-10%, a body-mass-index of 20-40 kg/m2, and had to be treated with stable doses of metformin only. We recorded ECG, finger and brachial blood pressure, and muscle sympathetic nerve activity (MSNA). Results MSNA was 37.5 ± 2.5 bursts/min in women and 39.0 ± 2.0 bursts/min in men (p = 0.55). MSNA expressed as burst incidence was 52.7 ± 2.0 bursts/100 beats in women and 59.2 ± 3.1 bursts/100 beats in men (p = 0.21). Five out of 39 men (12.8%) and two out of 22 women (9.1%) exhibited resting MSNA measurements above the 95th percentile for sex and age. In the pooled analysis, MSNA was not significantly correlated with systolic blood pressure, diastolic blood pressure, body mass index, waist circumference, body composition, or HbA1c (r 2 < 0.02, p > 0.26 for all). Discussion We conclude that relatively few older patients with type 2 diabetes mellitus exhibit increased MSNA. The large interindividual variability in MSNA cannot be explained by gender, blood pressure, body mass index, or glycemic control.
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Affiliation(s)
- Karsten Heusser
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Jens Tank
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - André Diedrich
- Vanderbilt Autonomic Dysfunction Center, Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States,Department of Biomedical Engineering, School of Engineering, Vanderbilt University, Nashville, TN, United States
| | - Annelie Fischer
- Profil Institut für Stoffwechselforschung GmbH, Neuss, Germany
| | - Tim Heise
- Profil Institut für Stoffwechselforschung GmbH, Neuss, Germany
| | - Jens Jordan
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany,Medical Faculty, University of Cologne, Cologne, Germany,*Correspondence: Jens Jordan,
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24
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Ehlers TS, Møller S, Hansen CC, Tamariz-Ellemann AS, Vermeulen TD, Shoemaker JK, Gliemann L, Hellsten Y. Sympathetic activity is not a main cause of blood pressure reduction with exercise training in un-medicated middle-aged/older men. Scand J Med Sci Sports 2023; 33:586-596. [PMID: 36587373 DOI: 10.1111/sms.14300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 12/01/2022] [Accepted: 12/22/2022] [Indexed: 01/02/2023]
Abstract
BACKGROUND This study tested the hypothesis that training reduces resting sympathetic activity and improves baroreflex control in both hypertensive and normotensive men but reduces blood pressure only in hypertensive men. METHODS Middle-aged/older un-medicated stage-1 hypertensive males (mean age 55 ± 3 years; n = 13) and normotensive controls (mean age 60 ± 5 years; n = 12) participated in 8 weeks of supervised high-intensity interval spinning training. Before and after training, muscle sympathetic nerve activity (MSNA) and blood pressure were measured at rest and during a sympatho-excitatory cold pressor test (CPT). Based on the measurements, baroreceptor sensitivity and baroreceptor threshold were calculated. RESULTS Resting MSNA and baroreceptor sensitivity were similar for the hypertensive and the normotensive groups. Training lowered MSNA (p < 0.05), expressed as burst frequency (burst/min), overall, and to a similar extent, in both groups (17% and 27%, respectively, in hypertensive and normotensive group), whereas blood pressure was only significantly (p < 0.05) lowered (by 4 mmHg in both systolic and diastolic pressure) in the hypertensive group. Training did not (p > 0.05) alter the MSNA or blood pressure response to CPT or increase baroreceptor sensitivity but reduced (p < 0.05) the baroreceptor threshold with a main effect for both groups. Training adherence and intensity were similar in both groups yet absolute maximal oxygen uptake increased by 15% in the normotensive group only. CONCLUSION The dissociation between the training induced changes in resting MSNA, lack of change in baroreflex sensitivity and the change in blood pressure, suggests that MSNA is not a main cause of the blood pressure reduction with exercise training in un-medicated middle-aged/older men.
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Affiliation(s)
- Thomas S Ehlers
- Department for Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Sophie Møller
- Department for Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Camilla C Hansen
- Department for Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | | | | | | | - Lasse Gliemann
- Department for Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Ylva Hellsten
- Department for Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
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25
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Bo JH, Wang JX, Wang XL, Jiao Y, Jiang M, Chen JL, Hao WY, Chen Q, Li YH, Ma ZL, Zhu GQ. Dexmedetomidine Attenuates Lipopolysaccharide-Induced Sympathetic Activation and Sepsis via Suppressing Superoxide Signaling in Paraventricular Nucleus. Antioxidants (Basel) 2022; 11:antiox11122395. [PMID: 36552603 PMCID: PMC9774688 DOI: 10.3390/antiox11122395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/15/2022] [Accepted: 11/29/2022] [Indexed: 12/07/2022] Open
Abstract
Sympathetic overactivity contributes to the pathogenesis of sepsis. The selective α2-adrenergic receptor agonist dexmedetomidine (DEX) is widely used for perioperative sedation and analgesia. We aimed to determine the central roles and mechanisms of DEX in attenuating sympathetic activity and inflammation in sepsis. Sepsis was induced by a single intraperitoneal injection of lipopolysaccharide (LPS) in rats. Effects of DEX were investigated 24 h after injection of LPS. Bilateral microinjection of DEX in the paraventricular nucleus (PVN) attenuated LPS-induced sympathetic overactivity, which was attenuated by the superoxide dismutase inhibitor DETC, cAMP analog db-cAMP or GABAA receptor antagonist gabazine. Superoxide scavenger tempol, NADPH oxidase inhibitor apocynin, adenylate cyclase inhibitor SQ22536 or PKA inhibitor Rp-cAMP caused similar effects to DEX in attenuating LPS-induced sympathetic activation. DEX inhibited LPS-induced superoxide and cAMP production, as well as NADPH oxidase, adenylate cyclase and PKA activation. The roles of DEX in reducing superoxide production and NADPH oxidase activation were attenuated by db-cAMP or gabazine. Intravenous infusion of DEX inhibited LPS-induced sympathetic overactivity, NOX activation, superoxide production, TNF-α and IL-1β upregulation in the PVN and plasma, as well as lung and renal injury, which were attenuated by the PVN microinjection of yohimbine and DETC. We conclude that activation of α2-adrenergic receptors with DEX in the PVN attenuated LPS-induced sympathetic overactivity by reducing NADPH oxidase-dependent superoxide production via both inhibiting adenylate cyclase-cAMP-PKA signaling and activating GABAA receptors. The inhibition of NADPH oxidase-dependent superoxide production in the PVN partially contributes to the roles of intravenous infusion of DEX in attenuating LPS-induced sympathetic activation, oxidative stress and inflammation.
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Affiliation(s)
- Jin-Hua Bo
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
- Department of Anesthesiology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Jing-Xiao Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
| | - Xiao-Li Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
| | - Yang Jiao
- Department of Anesthesiology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Ming Jiang
- Department of Anesthesiology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Jun-Liu Chen
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
| | - Wen-Yuan Hao
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
| | - Qi Chen
- Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Yue-Hua Li
- Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Zheng-Liang Ma
- Department of Anesthesiology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
- Correspondence: (Z.-L.M.); (G.-Q.Z.)
| | - Guo-Qing Zhu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Physiology, Nanjing Medical University, Nanjing 211166, China
- Correspondence: (Z.-L.M.); (G.-Q.Z.)
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26
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Mota CMD. Autonomic nerves differentially control inflammation during endotoxaemia. J Physiol 2022; 600:5187-5188. [PMID: 36314444 DOI: 10.1113/jp283816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022] Open
Affiliation(s)
- Clarissa M D Mota
- Department of Neurological Surgery, Oregon Health and Science University, Portland, OR, USA
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27
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Esler M, Kjeldsen SE, Pathak A, Grassi G, Kreutz R, Mancia G. Diverse pharmacological properties, trial results, comorbidity prescribing and neural pathophysiology suggest European hypertension guideline downgrading of beta-blockers is not justified. Blood Press 2022; 31:210-224. [PMID: 36029011 DOI: 10.1080/08037051.2022.2110858] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Beta-blockers have solid documentation in preventing cardiovascular complications in the treatment of hypertension; atenolol, metoprolol, oxprenolol and propranolol demonstrate proven cardiovascular prevention in hypertension mega-trials. Hypertension is characterised by activation of the sympathetic nervous system from early to late phases, which makes beta-blockers an appropriate treatment seen from a pathophysiological viewpoint, especially in patients with an elevated heart rate. Beta-blockers represent a heterogenous class of drugs with regard to both pharmacodynamic and pharmacokinetic properties. This position is manifest by reference to another clinical context, beta-blocker treatment of heart failure, where unequivocally there is no class effect (no similar benefit from all beta-blockers); there are good and less good beta-blockers for heart failure. Analogous differences in beta-blocker efficacy is also likely in hypertension. Beta-blockers are widely used for the treatment of diseases comorbid with hypertension, in approximately 50 different concomitant medical conditions that are frequent in patients with hypertension, leading to many de facto beta-blocker first choices in clinical practice. Thus, beta-blockers should be regarded as relevant first choices for hypertension in clinical practice, particularly if characterised by a long half-life, highly selective beta-1 blocking activity and no intrinsic agonist properties.SUMMARYBeta-blockers have solid documentation in preventing cardiovascular complications in the treatment of hypertension; atenolol, metoprolol, oxprenolol and propranolol demonstrate proven cardiovascular prevention in hypertension mega-trialsHypertension is characterised by activation of the sympathetic nervous system from early to late phases, which makes beta-blockers an appropriate treatment seen from a pathophysiological viewpoint, especially in patients with an elevated heart rateBeta-blockers represent a heterogenous class of drugs with regard to both pharmacodynamic and pharmacokinetic propertiesThis position is manifest by reference to another clinical context, beta-blocker treatment of heart failure, where unequivocally there is no class effect (no similar benefit from all beta-blockers); there are good and less good beta-blockers for heart failureAnalogous differences in beta-blocker efficacy is also likely in hypertensionBeta-blockers are widely used for the treatment of diseases comorbid with hypertension, in approximately 50 different concomitant medical conditions that are frequent in patients with hypertension, leading to many de facto beta-blockers first choices in clinical practiceThese observations, in totality, inform our opinion that beta-blockers are relevant first choices for hypertension in clinical practice and this fact needs highlightingFurther, these arguments suggest European hypertension guideline downgrading of beta-blockers is not justified.
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Affiliation(s)
- Murray Esler
- Baker Heart and Diabetes Institute, Human Neurotransmitters Laboratory and Monash University, Melbourne, Australia
| | - Sverre E Kjeldsen
- Department of Cardiology, Ullevaal Hospital, University of Oslo, Oslo, Norway
| | - Atul Pathak
- Department of Cardiology, and UMR UT3 CNRS 5288 Hypertension and heart failure: molecular and clinical investigations, INI-CRCT F-CRIN, GREAT Networks, Centre Hospitalier Princesse Grace, Monte Carlo, Monaco
| | | | - Reinhold Kreutz
- Charité - Medical University of Berlin, Institute of Clinical Pharmacology and Toxicology, Berlin, Germany
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28
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Dissanayake HU, Bin YS, Sutherland K, Ucak S, de Chazal P, Cistulli PA. The effect of obstructive sleep apnea therapy on cardiovascular autonomic function: a systematic review and meta-analysis. Sleep 2022; 45:6700716. [PMID: 36107126 PMCID: PMC9742902 DOI: 10.1093/sleep/zsac210] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 07/01/2022] [Indexed: 12/15/2022] Open
Abstract
STUDY OBJECTIVES Autonomic function is impaired in obstructive sleep apnea (OSA) and may mediate the association between OSA and cardiovascular risk. We investigated the effect of OSA therapy on autonomic function through a systematic review and meta-analysis of intervention studies. METHODS A systematic search using three databases (Medline, Embase, and Scopus) was performed up to December 9, 2020. Studies of OSA patients ≥ 18 years with autonomic function assessed before and after treatment with positive airway pressure, oral appliance, positional therapy, weight loss, or surgical intervention were included for review. Random effects meta-analysis was carried out for five groups of autonomic function indices. Risk of bias was assessed using the Cochrane Collaboration tool. RESULTS Forty-three eligible studies were reviewed with 39 included in the meta-analysis. OSA treatment led to large decreases in muscle sympathetic nerve activity (Hedges' g = -1.08; 95% CI -1.50, -0.65, n = 8) and moderate decreases in catecholamines (-0.60; -0.94, -0.27, n = 3) and radio nucleotide imaging (-0.61; -0.99, -0.24, n = 2). OSA therapy had no significant effect on baroreflex function (Hedges' g = 0.15; 95% CI -0.09, 0.39, n = 6) or heart rate variability (0.02; -0.32, 0.36, n = 14). There was a significant risk of bias due to studies being primarily non-randomized trials. CONCLUSIONS OSA therapy selectively improves autonomic function measures. The strongest evidence for the effect of OSA therapy on autonomic function was seen in reduced sympathetic activity as assessed by microneurography, but without increased improvement in parasympathetic function. OSA therapy may reduce the risk of cardiovascular disease in OSA through reduced sympathetic activity.
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Affiliation(s)
- Hasthi U Dissanayake
- Corresponding author. Hasthi Dissanayake, 3E67 Sleep Research Group, D17 Charles Perkins Centre, University of Sydney NSW 2006, Australia.
| | - Yu Sun Bin
- Sleep Research Group, Charles Perkins Centre, University of Sydney, Australia,Northern Clinical School, Faculty of Medicine and Health, University of Sydney, Australia
| | - Kate Sutherland
- Sleep Research Group, Charles Perkins Centre, University of Sydney, Australia,Northern Clinical School, Faculty of Medicine and Health, University of Sydney, Australia,Centre for Sleep Health and Research, Department of Respiratory Medicine, Royal North Shore Hospital, Australia
| | - Seren Ucak
- Sleep Research Group, Charles Perkins Centre, University of Sydney, Australia,Northern Clinical School, Faculty of Medicine and Health, University of Sydney, Australia
| | - Philip de Chazal
- Sleep Research Group, Charles Perkins Centre, University of Sydney, Australia,School of Biomedical Engineering, University of Sydney, Sydney, NSW, 2006, Australia
| | - Peter A Cistulli
- Sleep Research Group, Charles Perkins Centre, University of Sydney, Australia,Northern Clinical School, Faculty of Medicine and Health, University of Sydney, Australia,Centre for Sleep Health and Research, Department of Respiratory Medicine, Royal North Shore Hospital, Australia
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Maier LE, Matenchuk BA, Vucenovic A, Sivak A, Davenport MH, Steinback CD. Influence of Obstructive Sleep Apnea Severity on Muscle Sympathetic Nerve Activity and Blood Pressure: a Systematic Review and Meta-Analysis. Hypertension 2022; 79:2091-2104. [PMID: 35766054 DOI: 10.1161/hypertensionaha.122.19288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND We conducted meta-analyses to identify relationships between obstructive sleep apnea (OSA) severity, muscle sympathetic nerve activity (MSNA), and blood pressure (BP). We quantified the effect of OSA treatment on MSNA. METHODS Structured searches of electronic databases were performed until June 2021. All observational designs (except reviews) were included: population (individuals with OSA); exposures (OSA diagnosis and direct measures of MSNA); comparator (individuals without OSA or different severity of OSA); outcomes (MSNA, BP, and heart rate). RESULTS Fifty-six studies (N=1872) were included. MSNA burst frequency was higher in OSA (27 studies; n=542) versus controls (n=488; mean differences [MDs], +15.95 bursts/min [95% CI, 12.6-17.6 bursts/min]; I2=86%). As was burst incidence (20 studies; n=357 OSA, n=312 Controls; MD, +22.23 bursts/100 hbs [95% CI, 18.49-25.97 bursts/100 hbs]; I2=67%). Meta-regressions indicated relationships between MSNA and OSA severity (burst frequency, R2=0.489; P<0.001; burst incidence, R2=0.573; P<0.001). MSNA burst frequency was related to systolic pressure (R2=0.308; P=0.016). OSA treatment with continuous positive airway pressure reduced MSNA burst frequency (MD, 11.91 bursts/min [95% CI, 9.36-14.47 bursts/min] I2=15%) and systolic (n=49; MD, 10.3 mm Hg [95% CI, 3.5-17.2 mm Hg]; I2=42%) and diastolic (MD, 6.9 mm Hg [95% CI, 2.3-11.6 mm Hg]; I2=37%) BP. CONCLUSIONS MSNA is higher in individuals with OSA and related to severity. This sympathoexcitation is also related to BP in patients with OSA. Treatment effectively reduces MSNA and BP, but limited data prevents an assessment of the link between these reductions. These data are clinically important for understanding cardiovascular disease risk in patients with OSA. REGISTRATION URL: https://www. CLINICALTRIALS gov; Unique identifier: CRD42021285159.
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Affiliation(s)
- Lauren E Maier
- Neurovascular Health Laboratory, Faculty of Kinesiology, Sport, and Recreation (L.E.M., A.V., C.D.S.), University of Alberta, Edmonton, Canada
| | - Brittany A Matenchuk
- Program for Pregnancy and Postpartum Health, Faculty of Kinesiology, Sport, and Recreation (B.A.M., M.H.D.), University of Alberta, Edmonton, Canada
| | - Ana Vucenovic
- Neurovascular Health Laboratory, Faculty of Kinesiology, Sport, and Recreation (L.E.M., A.V., C.D.S.), University of Alberta, Edmonton, Canada
| | - Allison Sivak
- H.T. Coutts Education and Physical Education Library (A.S.), University of Alberta, Edmonton, Canada
| | - Margie H Davenport
- Program for Pregnancy and Postpartum Health, Faculty of Kinesiology, Sport, and Recreation (B.A.M., M.H.D.), University of Alberta, Edmonton, Canada
| | - Craig D Steinback
- Neurovascular Health Laboratory, Faculty of Kinesiology, Sport, and Recreation (L.E.M., A.V., C.D.S.), University of Alberta, Edmonton, Canada
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30
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Grassi G, Fowler B, Scali B, Rossi F, Motto E, Pieruzzi F, Mancia G. Sympathetic activation and heart rate thresholds for cardiovascular risk in chronic kidney disease. J Hypertens 2022; 40:1530-1536. [PMID: 35792492 PMCID: PMC10860883 DOI: 10.1097/hjh.0000000000003179] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/07/2022] [Accepted: 02/07/2022] [Indexed: 01/20/2023]
Abstract
AIM The current study was designed at assessing whether the sympathetic cardiovascular drive (SNS) is differently activated in chronic kidney disease (CKD) patients displaying less or more elevated resting heart rate (HR) values. It was also designed at determining at which HR cutoff value the SNS displays a greater activation. METHODS In 95 CKD middle-age patients we evaluated muscle sympathetic nerve activity (MSNA, microneurography) and venous plasma norepinephrine (HPLC assay), subdividing the patients in different groups according to their resting clinic and 24-h HR. RESULTS In CKD progressively greater values of clinic or 24-h HR were associated with a progressive increase in both MSNA and norepinephrine. HR cutoff values indicated by large-scale clinical trials for determining cardiorenal risk, that is more than 80 bpm, were associated with MSNA values significantly greater than the ones detected in patients with lower HR, this being the case also for norepinephrine. Both MSNA and norepinephrine were significantly related to clinic ( r = 0.47, P < 0.0001 and r = 0.26, P < 0.0001, respectively) and 24-h ( r = 0.42, P < 0.0001 and r = 0.27, P < 0.0001, respectively) HR. MSNA, norepinephrine, but not HR, were significantly and inversely related to estimated glomerular filtration rate (eGFR) values ( r = -0.47, r = -0.23, P < 0.0001 and P < 0.02, respectively). CONCLUSION In CKD both clinic and 24-h HR values greater than 80 bpm are associated with an enhanced sympathetic activation, which parallelles for magnitude the HR elevations. The sensitivity of HR as sympathetic marker is limited; however, no significant relationship being detected between HR and eGFR or left ventricular mass index.
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Affiliation(s)
| | | | | | | | | | - Federico Pieruzzi
- Clinica Nefrologica, Department of Medicine and Surgery, University Milano-Bicocca
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31
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Chen B, Somers VK, Sun Q, Dai Y, Li Y. Implications of sympathetic activation for objective versus self-reported daytime sleepiness in obstructive sleep apnea. Sleep 2022; 45:6562985. [PMID: 35373304 DOI: 10.1093/sleep/zsac076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/03/2022] [Indexed: 02/05/2023] Open
Abstract
STUDY OBJECTIVES Objective excessive daytime sleepiness (EDS) is associated with systemic inflammation and a higher risk of cardiometabolic morbidity in obstructive sleep apnea (OSA). We hypothesized that OSA with objective EDS is associated with higher levels of sympathetic nerve activity (SNA) when compared with self-reported EDS. We, therefore, examined the associations between objective and self-reported EDS with SNA in patients with OSA. METHODS We studied 147 consecutive male patients with OSA from the institutional sleep clinic. Objective EDS and self-reported EDS were defined based on Multiple Sleep Latency Test (MSLT) latency ≤ 8 minutes and Epworth Sleepiness Scale (ESS) > 10, respectively. Twenty-four-hour urinary norepinephrine was used for assessing SNA. Blood pressure (BP) was measured both in the evening and in the morning. RESULTS Twenty-four-hour urinary norepinephrine was significantly higher in patients with OSA with objective EDS compared with those without objective EDS (p = 0.034), whereas it was lower in patients with OSA with self-reported EDS compared with those without self-reported EDS (p = 0.038) after adjusting for confounders. Differences in the sympathetic drive were most striking in those with an objective but not self-reported EDS versus those with self-reported but not objective EDS (p = 0.002). Moreover, shorter MSLT latency was significantly associated with higher diastolic BP (β = -0.156, p = 0.049) but not systolic BP. No significant association between ESS scores and BP was observed. CONCLUSIONS Objective, but not self-reported EDS, is associated with increased SNA and diastolic BP among males with OSA, suggesting that objective EDS is a more severe phenotype of OSA that is accompanied by higher sympathetic drive, higher BP, and possibly greater cardiovascular morbidity and mortality.
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Affiliation(s)
- Baixin Chen
- Department of Sleep Medicine, Shantou University Mental Health Center, Shantou University Medical College, Shantou, China
- Sleep Medicine Center, Shantou University Medical College, Shantou, China and
| | - Virend K Somers
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Qimeng Sun
- Department of Sleep Medicine, Shantou University Mental Health Center, Shantou University Medical College, Shantou, China
- Sleep Medicine Center, Shantou University Medical College, Shantou, China and
| | - Yanyuan Dai
- Department of Sleep Medicine, Shantou University Mental Health Center, Shantou University Medical College, Shantou, China
- Sleep Medicine Center, Shantou University Medical College, Shantou, China and
| | - Yun Li
- Department of Sleep Medicine, Shantou University Mental Health Center, Shantou University Medical College, Shantou, China
- Sleep Medicine Center, Shantou University Medical College, Shantou, China and
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32
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Okyay RE, Çetintaş B, Akdöner A, Öztura İ, Eryaşar Yildirim G, Çağliyan E, Yavuz O, Şişman AR. The effect of oral contraceptive use on sympatic nerve activity in patients with polycystic ovary syndrome. Gynecol Endocrinol 2022; 38:592-597. [PMID: 35670515 DOI: 10.1080/09513590.2022.2082403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVE High sympathetic nerve activity, is thought to be a cardiovascular risk factor, has been shown to correlate with circulating high testosterone levels. However its role on the pathophysiology of the polycystic ovarian syndrome has not been clearly established. The aim of our study is to compare the sympathetic nerve activity between polycystic ovarian syndrome and control group and to determine whether the use of oral contraceptives for contraception has any effect on this activity. MATERIALS AND METHODS Our study has designed as a prospective, case-control study including patients diagnosed with polycystic ovarian syndrome. Antropometric measurements were calculated, hormone levels were measured and sympathetic skin response and heart rate variability measurements were performed in the laboratory to assess sympathetic activity before starting oral contraceptive pill therapy and at the end of 1 month follow up. RESULTS In the baseline condition LH/FSH ratio, LH, DHEAS, and total testosterone levels were significantly higher in women with PCOS. After 1 month of treatment, reductions in Ferriman-Gallwey score, ovarian volumes, number of follicles, LH/FSH ratio, LH, and androgen hormone levels were statistically significant. The mean values of sympathetic skin response amplitude and R-R analysis-Valsalva test were higher in PCOS group as compared to the control group. However, these differences were not statistically significant. Similarly, no statistically significant difference in SSR latency and R-R analysis-standup test were demonstrated between PCOS and control groups. CONCLUSION In conclusion, our study supports the increased sympatovagal activity in patients with polycystic ovarian syndrome.
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Affiliation(s)
- Recep Emre Okyay
- Department of Obstetrics and Gynecology, Eylul University School of Medicine, Izmir, Turkey
| | - Buket Çetintaş
- Department of Obstetrics and Gynecology, Eylul University School of Medicine, Izmir, Turkey
| | - Aslı Akdöner
- Department of Obstetrics and Gynecology, Eylul University School of Medicine, Izmir, Turkey
| | - İbrahim Öztura
- Department of Neurology, Eylul University School of Medicine, Izmir, Turkey
| | | | - Erkan Çağliyan
- Department of Obstetrics and Gynecology, Eylul University School of Medicine, Izmir, Turkey
| | - Onur Yavuz
- Department of Obstetrics and Gynecology, Eylul University School of Medicine, Izmir, Turkey
| | - Ali Rıza Şişman
- Department of Biochemistry, Eylul University School of Medicine, Izmir, Turkey
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33
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Joyner MJ, Klassen SA. Embracing a curiosity-driven approach in the microneurographic exploration of the human vagus nerves. J Physiol 2022; 600:3009-3010. [PMID: 35621702 DOI: 10.1113/jp283281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 05/25/2022] [Indexed: 11/08/2022] Open
Affiliation(s)
- Michael J Joyner
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, United States
| | - Stephen A Klassen
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, St. Catharines, Ontario, Canada
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34
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Wu LL, Zhang Y, Li XZ, Du XL, Gao Y, Wang JX, Wang XL, Chen Q, Li YH, Zhu GQ, Tan X. Impact of Selective Renal Afferent Denervation on Oxidative Stress and Vascular Remodeling in Spontaneously Hypertensive Rats. Antioxidants (Basel) 2022; 11:1003. [PMID: 35624870 PMCID: PMC9137540 DOI: 10.3390/antiox11051003] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/15/2022] [Accepted: 05/18/2022] [Indexed: 02/01/2023] Open
Abstract
Oxidative stress and sustained sympathetic over-activity contribute to the pathogenesis of hypertension. Catheter-based renal denervation has been used as a strategy for treatment of resistant hypertension, which interrupts both afferent and efferent renal fibers. However, it is unknown whether selective renal afferent denervation (RAD) may play beneficial roles in attenuating oxidative stress and sympathetic activity in hypertension. This study investigated the impact of selective RAD on hypertension and vascular remodeling. Nine-week-old normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) were subjected to selective renal afferent denervation (RAD) with 33 mM of capsaicin for 15 min. Treatment with the vehicle of capsaicin was used as a control. The selective denervation was confirmed by the reduced calcitonin gene-related peptide expression and the undamaged renal sympathetic nerve activity response to the stimulation of adipose white tissue. Selective RAD reduced plasma norepinephrine levels, improved heart rate variability (HRV) and attenuated hypertension in SHR.It reduced NADPH oxidase (NOX) expression and activity, and superoxide production in the hypothalamic paraventricular nucleus (PVN), aorta and mesenteric artery of SHR. Moreover, the selective RAD attenuated the vascular remodeling of the aorta and mesenteric artery of SHR. These results indicate that selective removal of renal afferents attenuates sympathetic activity, oxidative stress, vascular remodeling and hypertension in SHR. The attenuated superoxide signaling in the PVN is involved in the attenuation of sympathetic activity in SHR, and the reduced sympathetic activity at least partially contributes to the attenuation of vascular oxidative stress and remodeling in the arteries of hypertensive rats.
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Affiliation(s)
- Lu-Lu Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, and Department of Physiology, Nanjing Medical University, Nanjing 211166, China; (L.-L.W.); (J.-X.W.); (X.-L.W.)
| | - Yue Zhang
- Emergency Department, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; (Y.Z.); (X.-Z.L.); (X.-L.D.); (Y.G.)
| | - Xiu-Zhen Li
- Emergency Department, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; (Y.Z.); (X.-Z.L.); (X.-L.D.); (Y.G.)
| | - Xin-Li Du
- Emergency Department, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; (Y.Z.); (X.-Z.L.); (X.-L.D.); (Y.G.)
| | - Ying Gao
- Emergency Department, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; (Y.Z.); (X.-Z.L.); (X.-L.D.); (Y.G.)
| | - Jing-Xiao Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, and Department of Physiology, Nanjing Medical University, Nanjing 211166, China; (L.-L.W.); (J.-X.W.); (X.-L.W.)
| | - Xiao-Li Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, and Department of Physiology, Nanjing Medical University, Nanjing 211166, China; (L.-L.W.); (J.-X.W.); (X.-L.W.)
| | - Qi Chen
- Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China; (Q.C.); (Y.-H.L.)
| | - Yue-Hua Li
- Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China; (Q.C.); (Y.-H.L.)
| | - Guo-Qing Zhu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, and Department of Physiology, Nanjing Medical University, Nanjing 211166, China; (L.-L.W.); (J.-X.W.); (X.-L.W.)
| | - Xiao Tan
- Emergency Department, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 211166, China; (Y.Z.); (X.-Z.L.); (X.-L.D.); (Y.G.)
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Tomeo RA, Gomes-de-Souza L, Benini R, Reis-Silva LL, Crestani CC. Site-Specific Regulation of Stress Responses Along the Rostrocaudal Axis of the Insular Cortex in Rats. Front Neurosci 2022; 16:878927. [PMID: 35620667 PMCID: PMC9127339 DOI: 10.3389/fnins.2022.878927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
The insular cortex (IC) has been described as a part of the central network implicated in the integration and processing of limbic information, being related to the behavioral and physiological responses to stressful events. Besides, a site-specific control of physiological functions has been reported along the rostrocaudal axis of the IC. However, a functional topography of the IC in the regulation of stress responses has never been reported. Therefore, this study aimed to investigate the impact of acute restraint stress in neuronal activation at different sites along the rostrocaudal axis of the IC. Furthermore, we evaluated the involvement of IC rostrocaudal subregions in the cardiovascular responses to acute restraint stress. We observed that an acute session of restraint stress increased the number of Fos-immunoreactive cells in the rostral posterior region of the IC, while fewer activated cells were identified in the anterior and caudal posterior regions. Bilateral injection of the non-selective synaptic inhibitor CoCl2 into the anterior region of the IC did not affect the blood pressure and heart rate increases and the sympathetically mediated cutaneous vasoconstriction to acute restraint stress. However, synaptic ablation of the rostral posterior IC decreased the restraint-evoked arterial pressure increase, whereas tachycardia was reduced in animals in which the caudal posterior IC was inhibited. Taken together, these pieces of evidence indicate a site-specific regulation of cardiovascular stress response along the rostrocaudal axis of the IC.
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Affiliation(s)
| | | | | | | | - Carlos C. Crestani
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil
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36
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Pilcher JJ, Morris DM, Limyansky SE, Bryant SA. The effect of using activity workstations on heart rate variability during complex cognitive tasks. J Am Coll Health 2022; 70:948-955. [PMID: 32672519 DOI: 10.1080/07448481.2020.1782919] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 05/11/2020] [Accepted: 06/07/2020] [Indexed: 06/11/2023]
Abstract
ObjectivesThe purpose of the current study was to examine the effects of using an activity workstation on the physiological stress response as measured by heart rate variability while completing cognitively demanding tasks. Participants: Eleven college students (6 females; age: 19.4 ± 0.9 years) participated in the study. Methods: The participants completed three psychologically stressful cognitive tasks while seated at a traditional desk and while using an activity workstation. Heart rate variability was recorded and analyzed with power spectrum density and time-domain analysis. Results: Using activity workstations while completing stressful cognitive tasks did not negatively affect task performance. There was; however, a reduction in low frequency heart rate variability but no change in cardiac sympathovagal balance. Conclusion: The results indicate that using activity workstations while completing difficult tasks reduces sympathetic reactivity to stress in college students. This suggests that using activity workstations could provide a coping mechanism for stress.
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Affiliation(s)
- June J Pilcher
- Department of Psychology, Clemson University, Clemson, South Carolina, USA
| | - Drew M Morris
- Department of Psychology, Clemson University, Clemson, South Carolina, USA
| | - Sarah E Limyansky
- Department of Psychology, Clemson University, Clemson, South Carolina, USA
| | - Stewart A Bryant
- Department of Psychology, Clemson University, Clemson, South Carolina, USA
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Biffi A, Quarti-Trevano F, Bonzani M, Seravalle G, Corrao G, Mancia G, Grassi G. Neuroadrenergic activation in obstructive sleep apnoea syndrome: a new selected meta-analysis - revisited. J Hypertens 2022; 40:15-23. [PMID: 34857700 PMCID: PMC10871617 DOI: 10.1097/hjh.0000000000003045] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 10/22/2021] [Indexed: 01/09/2023]
Abstract
BACKGROUND Neuroadrenegic overdrive occurs in obstructive sleep apnoea syndrome (OSAS). However, the small sample size of the microneurographic studies, heterogeneity of the patients examined, presence of comorbidities, represented major weaknesses not allowing to precisely define the main features of the phenomenon, particularly in nonobese patients. OBJECTIVE This meta-analysis detected 14 microneurographic studies based on muscle sympathetic nerve activity (MSNA) quantification in uncomplicated OSAS of different clinical severity. METHODS The evaluation was extended to the relationships of MSNA with heart rate, anthropometric and blood pressure values, metabolic variables, apnoea-hypopnea index and oxygen saturation. RESULTS MSNA is activated markedly and almost homogeneously between studies, showing a progressive increase from the healthy state to mild, moderate and severe OSAS (46.03, 48.32, 71.84, 69.27 bursts/100 heart beats). Of special interest are the findings that MSNA is significantly related to the apnoea-hypopnea index, a marker of OSAS severity (r = 0.55, P = 0.04) but not to BMI, as it occurs in OSAS associated with obesity, and heart rate is significantly and directly related to MSNA and apnoea-hypopnea index (r = 0.68 and r = 0.60, respectively P = 0.03 and P = 0.02), thus representing a surrogate marker of the sympathetic overdrive. CONCLUSION OSAS, even when uncomplicated by other cardiometabolic disease, displays a marked sympathetic activation, reflected by the MSNA and heart rate behaviour, becoming a target of therapeutic interventions aimed at exerting sympathomoderating effects, such as continuous positive airway pressure.
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Affiliation(s)
- Annalisa Biffi
- Department of Statistics and Quantitative Methods, University Milano-Bicocca
- National Centre for Healthcare Research and Pharmacoepidemiology
| | - Fosca Quarti-Trevano
- Clinica Medica, Department of Medicine and Surgery, University of Milano-Bicocca
| | - Matilde Bonzani
- National Centre for Healthcare Research and Pharmacoepidemiology
| | - Gino Seravalle
- Department of Statistics and Quantitative Methods, University Milano-Bicocca
| | - Giovanni Corrao
- National Centre for Healthcare Research and Pharmacoepidemiology
- Clinica Medica, Department of Medicine and Surgery, University of Milano-Bicocca
| | - Giuseppe Mancia
- Policlinico di Monza, Monza and University Milano-Bicocca, Milan, Italy
| | - Guido Grassi
- Department of Statistics and Quantitative Methods, University Milano-Bicocca
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38
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叶 飞, 史 桂, 王 晓, 涂 珊, 张 志, 曾 丽. [Renal sympathetic denervation can significantly reduce blood pressure and improve arterial stiffness in hypertensive beagles]. Nan Fang Yi Ke Da Xue Xue Bao 2021; 41:1609-1615. [PMID: 34916185 PMCID: PMC8685710 DOI: 10.12122/j.issn.1673-4254.2021.11.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Indexed: 06/14/2023]
Abstract
OBJECTIVE To investigate the effect of renal sympathetic denervation (RDN) on blood pressure and arterial stiffness in hypertensive beagles and explore the underlying mechanism. METHODS Sixteen beagles were randomly divided into RDN group (n=8, fed with a high-salt high-fat diet to establish models of hypertension and treated with RDN), sham-operated group (n=4, fed with a high-salt high-fat diet to induce hypertension but only examined with renal arteriography) and control group (n=4, fed with formula dog food). The changes in blood pressure, arterial stiffness, endothelial function, and sympathetic activity were compared among the 3 groups and correlation analysis was performed. RESULTS All the animal models of hypertension were established successfully in the beagles. At 3 months after the RDN, the changes in systolic blood pressure (SBP) differed significantly among the 3 groups (P=0.006), and the reduction in SBP was significantly greater in RDN group than in the other two groups (P < 0.05). The variations of diastolic blood pressure (DBP) also differed significantly among the 3 groups (P=0.016), and DBP reduction was more obvious in RDN group than in the control group (P=0.007), but similar to that in the sham-operated group (P=0.052). The changes of resistance index (RI) after the procedure were significantly different among the 3 groups (P=0.043), and the RDN group showed a greater reduction of RI than the control group (P=0.032) and sham group (P=0.043). Serum levels of eNOS, NO and Ang Ⅱ did not differ significantly among the groups either before or after RDN (P>0.05), but serum NE level was significantly higher in RDN group than in the control groupafter successful modeling (P=0.014), but similar to that in the sham group (P=0.560). Compared with the sham operation, RDN in the hypertensive beagles resulted in a significantly greater decrease of serum NE level (P=0.032) to almost the control level (P= 0.080). The changes of RI following RDN were significantly correlated with the changes of SBP, DBP and serum levels of NO and NE (P < 0.05). CONCLUSION RDN can significantly reduce blood pressure and improve arterial stiffness in hypertensive beagles possibly by reducing sympathetic activity and blood pressure and promoting NO synthesis.
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Affiliation(s)
- 飞 叶
- 中南大学湘雅三医院心内科,湖南 长沙 410013Department of Cardiology, Third Xiangya Hospital of Central South University, Changsha 410013, China
| | - 桂霞 史
- 长沙卫生职业学院,湖南 长沙 410013Internal Medicine, Changsha Health Vocational College, Changsha 410013, China
| | - 晓艳 王
- 中南大学湘雅三医院心内科,湖南 长沙 410013Department of Cardiology, Third Xiangya Hospital of Central South University, Changsha 410013, China
| | - 珊 涂
- 中南大学湘雅三医院心内科,湖南 长沙 410013Department of Cardiology, Third Xiangya Hospital of Central South University, Changsha 410013, China
| | - 志辉 张
- 中南大学湘雅三医院心内科,湖南 长沙 410013Department of Cardiology, Third Xiangya Hospital of Central South University, Changsha 410013, China
| | - 丽雄 曾
- 中南大学湘雅三医院心内科,湖南 长沙 410013Department of Cardiology, Third Xiangya Hospital of Central South University, Changsha 410013, China
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Wu SJ, Kan WC, Shiao CC. Warm-water footbath improves dysmenorrhoea and heart rate variability in college students: a randomised controlled trial. J OBSTET GYNAECOL 2021; 42:1204-1210. [PMID: 34560833 DOI: 10.1080/01443615.2021.1945007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The effect of warm-water footbath in improving dysmenorrhoea has been rarely investigated. The study aimed to examine whether a warm-water footbath effectively reduces dysmenorrhoea pain and improves the autonomic nervous system (ANS) activity. The randomised controlled trial was registered at ClinicalTrials.gov. (NCT04071028) We enrolled college students with dysmenorrhoea in Northern Taiwan from December 1 2013 to June 30 2014, and randomised them into footbath (n = 35, median age 19 years) and control groups (n = 33, 18 years). Pain visual analogue scale and Short-Form McGill Pain Questionnaire were used for pain assessment, while heart rate variability (HRV) was measured to assess ANS function. After the interventions, the footbath group significantly improved ANS activity and reduced pain severity comparing to the control group. Furthermore, the changes in HRV positively correlated with the improvement of pain severity. In conclusion, a warm-water footbath is beneficial in improving the pain severity among college students with dysmenorrhoea.Impact StatementWhat is already known on this subject? Dysmenorrhoea is the most common gynaecological condition affecting 34-94% of young women. The existing conventional therapeutic strategies for dysmenorrhoea have potential adverse events. Among the complementary therapies for pain, the warm-water footbath is a widely used thermal therapy in improving peripheral neuropathy symptoms and improving patients' quality of life. The subjects with dysmenorrhoea associate with significantly altered autonomic nervous system (ANS) activity. However, the association among warm-water footbath, menstrual pain and ANS was rarely investigated previously.What the results of this study add? The randomised controlled trial enrolling 68 college students with dysmenorrhoea found warm-water footbath improved ANS activity and reduced pain severity. Furthermore, the changes in heart rate variability positively correlated with pain severity improvement.What the implications are of these findings for clinical practice and/or further research? A warm-water footbath for 20 minutes on menstruation days 1 and 2 is beneficial in improving pain among college students with dysmenorrhoea.
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Affiliation(s)
- Shih-Ju Wu
- Department of Nursing, Camillian Saint Mary's Hospital Luodong, Yilan, Taiwan.,Graduate Institute of Integration of Traditional Chinese Medicine with Western Nursing, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan
| | - Wei-Chih Kan
- Department of Nephrology, Department of Internal Medicine, Chi-Mei Medical Center, Tainan, Taiwan.,Department of Biological Science and Technology, Chung Hwa University of Medical Technology, Tainan, Taiwan
| | - Chih-Chung Shiao
- Department of Internal Medicine, Division of Nephrology, Camillian Saint Mary's Hospital Luodong, Yilan, Taiwan.,Saint Mary's Junior College of Medicine, Nursing and Management, Yilan, Taiwan
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40
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Oliveira LA, Pollo TRS, Rosa EA, Duarte JO, Xavier CH, Crestani CC. Both Prelimbic and Infralimbic Noradrenergic Neurotransmissions Modulate Cardiovascular Responses to Restraint Stress in Rats. Front Physiol 2021; 12:700540. [PMID: 34483957 PMCID: PMC8415160 DOI: 10.3389/fphys.2021.700540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 07/16/2021] [Indexed: 11/27/2022] Open
Abstract
The prelimbic (PL) and infralimbic (IL) subareas of the medial prefrontal cortex (mPFC) have been implicated in physiological and behavioral responses during aversive threats. The previous studies reported the noradrenaline release within the mPFC during stressful events, and the lesions of catecholaminergic terminals in this cortical structure affected stress-evoked local neuronal activation. Nevertheless, the role of mPFC adrenoceptors on cardiovascular responses during emotional stress is unknown. Thus, we investigated the role of adrenoceptors present within the PL and IL on the increase in both arterial pressure and heart rate (HR) and on the sympathetically mediated cutaneous vasoconstriction evoked by acute restraint stress. For this, bilateral guide cannulas were implanted into either the PL or IL of male rats. All animals were also subjected to catheter implantation into the femoral artery for cardiovascular recording. The increase in both arterial pressure and HR and the decrease in the tail skin temperature as an indirect measurement of sympathetically mediated cutaneous vasoconstriction were recorded during the restraint session. We observed that the microinjection of the selective α2-adrenoceptor antagonist RX821002 into either the PL or IL decreased the pressor response during restraint stress. Treatment of the PL or IL with either the α1-adrenoceptor antagonist WB4101 or the α2-adrenoceptor antagonist reduced the restraint-evoked tachycardia. The drop in the tail skin temperature was decreased by PL treatment with the β-adrenoceptor antagonist propranolol and with the α1- or α2-adrenoceptor antagonists. The α2-adrenoceptor antagonist into the IL also decreased the skin temperature response. Our results suggest that the noradrenergic neurotransmission in both PL and IL mediates the cardiovascular responses to aversive threats.
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Affiliation(s)
- Leandro A Oliveira
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil.,Joint Federal University of São Carlos (UFSCar) - São Paulo State University (UNESP) Graduate Program in Physiological Sciences, São Carlos, Brazil
| | - Taciana R S Pollo
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil
| | - Elinéia A Rosa
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil
| | - Josiane O Duarte
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil.,Joint Federal University of São Carlos (UFSCar) - São Paulo State University (UNESP) Graduate Program in Physiological Sciences, São Carlos, Brazil
| | - Carlos H Xavier
- Institute of Biological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Carlos C Crestani
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil.,Joint Federal University of São Carlos (UFSCar) - São Paulo State University (UNESP) Graduate Program in Physiological Sciences, São Carlos, Brazil
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41
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Feriani DJ, Sousa AS, Delbin MA, Ruberti OM, Crestani CC, Rodrigues B. Spleen tissue changes after restraint stress: effects of aerobic exercise training. Stress 2021; 24:572-583. [PMID: 33792481 DOI: 10.1080/10253890.2021.1895112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Inflammation has been described as a prominent mechanism involved in dysfunctions and diseases evoked by chronic stress. Notably, the spleen is an immune organ controlled by sympathetic and glucocorticoid mechanisms, but the impact of chronic stress in the spleen is not entirely understood. Besides, the impact of aerobic exercise training on the effects of chronic stress in the spleen has never been reported. Therefore, this study aimed to assess the changes caused in the spleen by repeated restraint stress and the effect of aerobic exercise training performed after a period of chronic restraint stress in rats. We identified that daily exposure to restraint stress (120 min per session, for 14 consecutive days) increased corticosterone and noradrenaline content, gene expression of glucocorticoid and β2-adrenergic receptors, TNF-α and IL-6 levels, and increased pro-oxidant substances in the spleen. Circulating levels of corticosterone were also increased in chronically stressed animals. Exercise training (1 h a day/5 days per week, for 60 days) increased glucocorticoid receptor gene expression, interleukin (IL)-10 and antioxidant mechanisms in the spleen. Exercise also decreased splenic noradrenaline, tumoral necrosis factor (TNF)-α, and IL-6 contents. Lastly, the effects of repeated restraint stress in the spleen were mitigated in animals subjected to aerobic training. Taken together, the results reported in the present study indicate that aerobic exercise training is a relevant non-pharmacological therapeutic approach to dysfunctions in the spleen caused by a period of stress.
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Affiliation(s)
- Daniele J Feriani
- Laboratory of Cardiovascular Investigation and Exercise (LICE), School of Physical Education, University of Campinas (UNICAMP), Campinas, Brazil
| | - Andressa S Sousa
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Maria Andreia Delbin
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Olívia M Ruberti
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Carlos C Crestani
- Department of Drugs and Pharmaceutics, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, Brazil
| | - Bruno Rodrigues
- Laboratory of Cardiovascular Investigation and Exercise (LICE), School of Physical Education, University of Campinas (UNICAMP), Campinas, Brazil
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
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42
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Wu LL, Bo JH, Zheng F, Zhang F, Chen Q, Li YH, Kang YM, Zhu GQ. Salusin-β in Intermediate Dorsal Motor Nucleus of the Vagus Regulates Sympathetic-Parasympathetic Balance and Blood Pressure. Biomedicines 2021; 9:1118. [PMID: 34572305 DOI: 10.3390/biomedicines9091118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/22/2021] [Accepted: 08/24/2021] [Indexed: 12/20/2022] Open
Abstract
The dorsal motor nucleus of the vagus (DMV) is known to control vagal activity. It is unknown whether the DMV regulates sympathetic activity and whether salusin-β in the DMV contributes to autonomic nervous activity. We investigated the roles of salusin-β in DMV in regulating sympathetic-parasympathetic balance and its underline mechanisms. Microinjections were carried out in the DMV and hypothalamic paraventricular nucleus (PVN) in male adult anesthetized rats. Renal sympathetic nerve activity (RSNA), blood pressure and heart rate were recorded. Immunohistochemistry for salusin-β and reactive oxidative species (ROS) production in the DMV were examined. Salusin-β was expressed in the intermediate DMV (iDMV). Salusin-β in the iDMV not only inhibited RSNA but also enhanced vagal activity and thereby reduced blood pressure and heart rate. The roles of salusin-β in causing vagal activation were mediated by NAD(P)H oxidase-dependent superoxide anion production in the iDMV. The roles of salusin-β in inhibiting RSNA were mediated by not only the NAD(P)H oxidase-originated superoxide anion production in the iDMV but also the γ-aminobutyric acid (GABA)A receptor activation in PVN. Moreover, endogenous salusin-β and ROS production in the iDMV play a tonic role in inhibiting RSNA. These results indicate that salusin-β in the iDMV inhibits sympathetic activity and enhances vagal activity, and thereby reduces blood pressure and heart rate, which are mediated by NAD(P)H oxidase-dependent ROS production in the iDMV. Moreover, GABAA receptor in the PVN mediates the effect of salusin-β on sympathetic inhibition. Endogenous salusin-β and ROS production in the iDMV play a tonic role in inhibiting sympathetic activity.
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Affiliation(s)
- Harini Sarathy
- Division of Nephrology and Hypertension, Zuckerberg San Francisco General Hospital, University of California San Francisco, San Francisco, California
| | - Jordana B Cohen
- Renal-Electrolyte and Hypertension Division, University of Pennsylvania, Philadelphia, Pennsylvania .,Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine, Philadelphia, Pennsylvania
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44
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Ye C, Zheng F, Wang JX, Wang XL, Chen Q, Li YH, Kang YM, Zhu GQ. Dysregulation of the Excitatory Renal Reflex in the Sympathetic Activation of Spontaneously Hypertensive Rat. Front Physiol 2021; 12:673950. [PMID: 34149454 PMCID: PMC8209386 DOI: 10.3389/fphys.2021.673950] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 04/08/2021] [Indexed: 11/20/2022] Open
Abstract
Excessive sympathetic activation plays crucial roles in the pathogenesis of hypertension. Chemical stimulation of renal afferents increases the sympathetic activity and blood pressure in normal rats. This study investigated the excitatory renal reflex (ERR) in the development of hypertension in the spontaneously hypertensive rat (SHR). Experiments were performed in the Wistar-Kyoto rat (WKY) and SHR aged at 4, 12, and 24 weeks under anesthesia. Renal infusion of capsaicin was used to stimulate renal afferents, and thus, to induce ERR. The ERR was evaluated by the changes in the contralateral renal sympathetic nerve activity and mean arterial pressure. At the age of 4 weeks, the early stage with a slight or moderate hypertension, the ERR was more enhanced in SHR compared with WKY. The pressor response was greater than the sympathetic activation response in the SHR. At the age of 12 weeks, the development stage with severe hypertension, there was no significant difference in the ERR between the WKY and SHR. At the age of 24 weeks, the later stage of hypertension with long-term several hypertensions, the ERR was more attenuated in the SHR compared with the WKY. On the other hand, the pressor response to sympathetic activation due to the ERR was smaller at the age of 12 and 24 weeks than those at the age of 4 weeks. These results indicate that ERR is enhanced in the early stage of hypertension, and attenuated in the later stage of hypertension in the SHR. Abnormal ERR is involved in the sympathetic activation and the development of hypertension.
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Affiliation(s)
- Chao Ye
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Fen Zheng
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Jing-Xiao Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Xiao-Li Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Qi Chen
- Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yue-Hua Li
- Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yu-Ming Kang
- Department of Physiology and Pathophysiology, Cardiovascular Research Center, Xi'an Jiaotong University School of Medicine, Xi'an, China
| | - Guo-Qing Zhu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center of Translational Medicine for Cardiovascular Disease, Department of Physiology, Nanjing Medical University, Nanjing, China.,Department of Pathophysiology, Nanjing Medical University, Nanjing, China
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45
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Liu Y, Wu M, Xu B, Kang L. Empagliflozin Alleviates Atherosclerosis Progression by Inhibiting Inflammation and Sympathetic Activity in a Normoglycemic Mouse Model. J Inflamm Res 2021; 14:2277-2287. [PMID: 34103961 PMCID: PMC8180283 DOI: 10.2147/jir.s309427] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 05/13/2021] [Indexed: 12/23/2022] Open
Abstract
Background Recent clinical studies have revealed that sodium glucose co-transporter 2 inhibitors (SGLT2i) reduced cardiovascular events in type 2 diabetes. Here, we investigated whether empagliflozin, as a kind of SGLT2i, could alleviate atherosclerosis progression in non-diabetic mice. Methods ApoE-/- mice were fed on a western diet for 12 weeks to induce atherosclerosis. The treatment group of mice was treated with drinking water containing empagliflozin (10mg/kg/day). On the 12th week, the whole aortas of each group were harvested. HE and Movat staining were performed for atherosclerotic lesion area and size. CD 68 and MCP-1 immunohistochemistry were used to evaluate inflammatory cell infiltration. Mouse serum lipid profiles (total cholesterol, triglyceride, low-density lipoprotein-C, and high-density lipoprotein-C), systemic inflammation level (IL-1β, IL-6 and IL-10), renin-angiotensin-aldosterone system (RAAS) and sympathetic activity (norepinephrine and neuropeptide Y) were measured by ELISA. Results Empagliflozin could reduce the atherosclerotic lesion areas. Specifically, empagliflozin could significantly decreased inflammatory levels, RAAS and sympathetic activity in vivo. In vitro studies also showed that empagliflozin could inhibit IL-1β expression in oxLDL-treated macrophages by regulating NF-κB signaling. Conclusion Empagliflozin could prevent atherosclerosis by repressing inflammation and sympathetic activity.
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Affiliation(s)
- Yihai Liu
- Department of Cardiology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, 210008, Jiangsu, People's Republic of China.,Department of Cardiology, Affiliated Drum Tower Hospital, Clinical College of Nanjing Medical University, Nanjing, 210008, Jiangsu, People's Republic of China
| | - Mingyue Wu
- Department of Cardiology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, 210008, Jiangsu, People's Republic of China
| | - Biao Xu
- Department of Cardiology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, 210008, Jiangsu, People's Republic of China
| | - Lina Kang
- Department of Cardiology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, 210008, Jiangsu, People's Republic of China
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Sabino-Carvalho JL, Fisher JP, Vianna LC. Autonomic Function in Patients With Parkinson's Disease: From Rest to Exercise. Front Physiol 2021; 12:626640. [PMID: 33815139 PMCID: PMC8017184 DOI: 10.3389/fphys.2021.626640] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 02/24/2021] [Indexed: 12/16/2022] Open
Abstract
Parkinson’s disease (PD) is a common neurodegenerative disorder classically characterized by symptoms of motor impairment (e.g., tremor and rigidity), but also presenting with important non-motor impairments. There is evidence for the reduced activity of both the parasympathetic and sympathetic limbs of the autonomic nervous system at rest in PD. Moreover, inappropriate autonomic adjustments accompany exercise, which can lead to inadequate hemodynamic responses, the failure to match the metabolic demands of working skeletal muscle and exercise intolerance. The underlying mechanisms remain unclear, but relevant alterations in several discrete central regions (e.g., dorsal motor nucleus of the vagus nerve, intermediolateral cell column) have been identified. Herein, we critically evaluate the clinically significant and complex associations between the autonomic dysfunction, fatigue and exercise capacity in PD.
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Affiliation(s)
- Jeann L Sabino-Carvalho
- NeuroV̇ASQ̇ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, Brazil
| | - James P Fisher
- Manaaki Mānawa - The Centre for Heart Research, Department of Physiology, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Lauro C Vianna
- NeuroV̇ASQ̇ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, Brazil.,Graduate Program in Medical Sciences, Faculty of Medicine, University of Brasília, Brasília, Brazil
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Ken-Dror G, Wood M, Fluck D, Sharma P, Fry CH, Han TS. Continuous positive airway pressure therapy reduces the levels of catecholamines and blood pressure in pseudophaeochromocytoma with coexisting obstructive sleep apnoea. JRSM Cardiovasc Dis 2021; 10:2048004021992191. [PMID: 34211704 PMCID: PMC8217809 DOI: 10.1177/2048004021992191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/08/2020] [Accepted: 01/05/2021] [Indexed: 11/16/2022] Open
Abstract
Background Stress from obstructive sleep apnoea (OSA) stimulates catecholamine release and consequently can exacerbate hypertension, even in the absence of a catecholamine-producing tumour (phaeochromocytoma). As such, a positive screening test for suspected phaeochromocytoma may be misleading. There exists only a handful case reports, and no controlled trials, how continuous positive airway pressure (CPAP) to treat OSA influences catecholamine levels. We examined changes to levels of urinary catecholamine and blood pressure in response to CPAP treatment. Methods We conducted a meta-analysis of data aggregated from published case reports of individual patient data up to April 2020. The quality of the reports was evaluated using the risk of bias in non-randomized studies of interventions (ROBINS-I) tool. Results A total of 13 cases (seven men and six women) from seven reports met our search criteria. Patients had mean age of 49.1 years (range = 36-62) and body mass index of 37.4 kg/m2 (range = 27-56). Most had moderate to severe OSA with CPAP treatment. Nine cases had 24-hour urinary noradrenaline assessment before and after CPAP treatment. CPAP treatment led to a 21% reduction (104 nmol/24-hours, 95% credible interval =59 to 148) in 24-hour urinary noradrenaline to within reference ranges, and 25% reduction (from 131 to 100 mmHg) in mean arterial pressure. The risk of overall bias evaluated by the ROBINS-I tool was found to be low in the majority of reports. Conclusions Investigations of patients suspected of phaeochromocytoma, particularly obese individuals, should exclude OSA and treat this condition if present before performing screening tests to assess for catecholamine levels.
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Affiliation(s)
- Gie Ken-Dror
- Institute of Cardiovascular Research, Royal Holloway, University of London, Egham, Surrey, UK
| | - Michael Wood
- Department of Respiratory Medicine, Ashford and St Peter's Hospitals NHS Foundation Trust, Guildford Road, Chertsey, Surrey, UK
| | - David Fluck
- Department of Cardiology, Ashford and St Peter's Hospitals NHS Foundation Trust, Guildford Road, Chertsey, Surrey, UK
| | - Pankaj Sharma
- Institute of Cardiovascular Research, Royal Holloway, University of London, Egham, Surrey, UK
| | - Christopher H Fry
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - Thang S Han
- Institute of Cardiovascular Research, Royal Holloway, University of London, Egham, Surrey, UK.,Department of Endocrinology, Ashford and St Peter's Hospitals NHS Foundation Trust, Guildford Road, Chertsey, Surrey, UK
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48
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Debi R, Yakobov S, Bhatt P, Lakin R. Too sympathetic to exercise: abnormal autonomic and metaboreflex activation in exercising rheumatoid arthritis patients. J Physiol 2021; 599:2135-2136. [PMID: 33569784 DOI: 10.1113/jp281407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 02/09/2021] [Indexed: 11/08/2022] Open
Affiliation(s)
- Ryan Debi
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Simona Yakobov
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Parashar Bhatt
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Robert Lakin
- Department of Biology, York University, Toronto, Ontario, Canada
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Rodrigues KL, Souza JR, Bazilio DS, de Oliveira M, Moraes MPS, Moraes DJA, Machado BH. Changes in the autonomic and respiratory patterns in mice submitted to short-term sustained hypoxia. Exp Physiol 2021; 106:759-770. [PMID: 33501717 DOI: 10.1113/ep089323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 01/20/2021] [Indexed: 12/22/2022]
Abstract
NEW FINDINGS What is the central question of this study? Do mice submitted to sustained hypoxia present autonomic and respiratory changes similarly to rats? What is the main finding and its importance? Arterial pressure in the normal range, reduced baseline heart rate and tachypnoea were observed in behaving sustained hypoxia mice. Recordings in the in situ preparation of mice submitted to sustained hypoxia show an increase in cervical vagus nerve activity and a simultaneous reduction in thoracic sympathetic nerve activity correlated with changes in the respiratory cycle. Therefore, mice are an important model for studies on the modulation of sympathetic activity to the cardiovascular system and the vagus innervation of the upper airways due to changes in the respiratory network induced by sustained hypoxia. ABSTRACT Short-term sustained hypoxia (SH) in rats induces sympathetic overactivity and hypertension due to changes in sympathetic-respiratory coupling. However, there are no consistent data about the effect of SH on mice due to the different protocols of hypoxia and difficulties associated with the handling of these rodents under different experimental conditions. In situ recordings of autonomic and respiratory nerves in SH mice have not been performed yet. Herein, we evaluated the effects of SH ( F i O 2 = 0.1 for 24 h) on baseline mean arterial pressure (MAP), heart rate (HR), respiratory frequency (fR ) and responses to chemoreflex activation in behaving SH mice. A characterization of changes in cervical vagus (cVN), thoracic sympathetic (tSN), phrenic (PN) and abdominal (AbN) nerves in SH mice using the in situ working heart-brainstem preparation was also performed. SH mice presented normal MAP, significant reduction in baseline HR, increase in baseline fR , as well as increase in the magnitude of bradycardic response to chemoreflex activation. In in situ preparations, SH mice presented a reduction in PN discharge frequency, and increases in the time of expiration and incidence of late-expiratory bursts in AbN activity. Nerve recordings also indicated a significant increase in cVN activity and a significant reduction in tSN activity during expiration in SH mice. These findings make SH mice an important experimental model for better understanding how changes in the respiratory network may impact on the modulation of vagal control to the upper airways, as well as in the sympathetic activity to the cardiovascular system.
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Affiliation(s)
- Karla L Rodrigues
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Juliana R Souza
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Darlan S Bazilio
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Mauro de Oliveira
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Melina P S Moraes
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Davi J A Moraes
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Benedito H Machado
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
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50
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Yuan MJ, Li W, Zhong P. Research progress of ghrelin on cardiovascular disease. Biosci Rep 2021; 41:BSR20203387. [PMID: 33427286 DOI: 10.1042/BSR20203387] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 01/04/2021] [Accepted: 01/08/2021] [Indexed: 01/04/2023] Open
Abstract
Ghrelin, a 28-aminoacid peptide, was isolated from the human and rat stomach and identified in 1999 as an endogenous ligand for the growth hormone secretagogue-receptor (GHS-R). In addition to stimulating appetite and regulating energy balance, ghrelin and its receptor GHS-R1a have a direct effect on the cardiovascular system. In recent years, it has been shown that ghrelin exerts cardioprotective effects, including the modulation of sympathetic activity and hypertension, enhancement of the vascular activity and angiogenesis, inhibition of arrhythmias, reduction in heart failure and inhibition of cardiac remodeling after myocardial infarction (MI). The cardiovascular protective effect of ghrelin may be associated with anti-inflammation, anti-apoptosis, inhibited sympathetic nerve activation, regulated autophagy, and endothelial dysfunction. However, the molecular mechanisms underlying the effects of ghrelin on the cardiovascular system have not been fully elucidated, and no specific therapeutic agent has been established. It is important to further explore the pharmacological potential of ghrelin pathway modulation for the treatment of cardiovascular diseases.
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