1
|
Flores-Pliego A, Miranda J, Vega-Torreblanca S, Valdespino-Vázquez Y, Helguera-Repetto C, Espejel-Nuñez A, Borboa-Olivares H, Espino y Sosa S, Mateu-Rogell P, León-Juárez M, Ramírez-Santes V, Cardona-Pérez A, Villegas-Mota I, Torres-Torres J, Juárez-Reyes Á, Rizo-Pica T, González RO, González-Mariscal L, Estrada-Gutierrez G. Molecular Insights into the Thrombotic and Microvascular Injury in Placental Endothelium of Women with Mild or Severe COVID-19. Cells 2021; 10:cells10020364. [PMID: 33578631 PMCID: PMC7916402 DOI: 10.3390/cells10020364] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/30/2021] [Accepted: 02/03/2021] [Indexed: 02/07/2023] Open
Abstract
Clinical manifestations of coronavirus disease 2019 (COVID-19) in pregnant women are diverse, and little is known of the impact of the disease on placental physiology. Severe acute respiratory syndrome coronavirus (SARS-CoV-2) has been detected in the human placenta, and its binding receptor ACE2 is present in a variety of placental cells, including endothelium. Here, we analyze the impact of COVID-19 in placental endothelium, studying by immunofluorescence the expression of von Willebrand factor (vWf), claudin-5, and vascular endothelial (VE) cadherin in the decidua and chorionic villi of placentas from women with mild and severe COVID-19 in comparison to healthy controls. Our results indicate that: (1) vWf expression increases in the endothelium of decidua and chorionic villi of placentas derived from women with COVID-19, being higher in severe cases; (2) Claudin-5 and VE-cadherin expression decrease in the decidua and chorionic villus of placentas from women with severe COVID-19 but not in those with mild disease. Placental histological analysis reveals thrombosis, infarcts, and vascular wall remodeling, confirming the deleterious effect of COVID-19 on placental vessels. Together, these results suggest that placentas from women with COVID-19 have a condition of leaky endothelium and thrombosis, which is sensitive to disease severity.
Collapse
Affiliation(s)
- Arturo Flores-Pliego
- Department of Immunobiochemistry, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (A.F.-P.); (C.H.-R.); (A.E.-N.); (M.L.-J.)
| | - Jael Miranda
- Department of Physiology, Biophysics and Neuroscience, Center for Research and Advanced Studies (Cinvestav), Ciudad de México 07360, Mexico; (J.M.); (S.V.-T.)
| | - Sara Vega-Torreblanca
- Department of Physiology, Biophysics and Neuroscience, Center for Research and Advanced Studies (Cinvestav), Ciudad de México 07360, Mexico; (J.M.); (S.V.-T.)
| | | | - Cecilia Helguera-Repetto
- Department of Immunobiochemistry, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (A.F.-P.); (C.H.-R.); (A.E.-N.); (M.L.-J.)
| | - Aurora Espejel-Nuñez
- Department of Immunobiochemistry, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (A.F.-P.); (C.H.-R.); (A.E.-N.); (M.L.-J.)
| | - Héctor Borboa-Olivares
- Community Interventions Research Branch, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico;
| | - Salvador Espino y Sosa
- Clinical Research Branch, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (S.E.yS.); (P.M.-R.)
| | - Paloma Mateu-Rogell
- Clinical Research Branch, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (S.E.yS.); (P.M.-R.)
| | - Moisés León-Juárez
- Department of Immunobiochemistry, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico; (A.F.-P.); (C.H.-R.); (A.E.-N.); (M.L.-J.)
| | - Victor Ramírez-Santes
- Department of Obstetrics, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico;
| | - Arturo Cardona-Pérez
- General Direction, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico;
| | - Isabel Villegas-Mota
- Department of Epidemiology, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico;
| | - Johnatan Torres-Torres
- Hospital General de México Dr Eduardo Liceaga, Ciudad de México 06720, Mexico; (J.T.-T.); (Á.J.-R.); (T.R.-P.)
| | - Ángeles Juárez-Reyes
- Hospital General de México Dr Eduardo Liceaga, Ciudad de México 06720, Mexico; (J.T.-T.); (Á.J.-R.); (T.R.-P.)
| | - Thelma Rizo-Pica
- Hospital General de México Dr Eduardo Liceaga, Ciudad de México 06720, Mexico; (J.T.-T.); (Á.J.-R.); (T.R.-P.)
| | - Rosa O. González
- Department of Mathematics, Autonomous Metropolitan University-Iztapalapa (UAM-I), Ciudad de México 14387, Mexico;
| | - Lorenza González-Mariscal
- Department of Physiology, Biophysics and Neuroscience, Center for Research and Advanced Studies (Cinvestav), Ciudad de México 07360, Mexico; (J.M.); (S.V.-T.)
- Correspondence: (L.G.-M.); (G.E.-G.); Tel.: +5255-5-747-3800 (ext. 3966) (L.G.-M.); +5255-5-520-9900 (ext. 160) (G.E.-G.)
| | - Guadalupe Estrada-Gutierrez
- Research Division, Instituto Nacional de Perinatología, Ciudad de México 11000, Mexico
- Correspondence: (L.G.-M.); (G.E.-G.); Tel.: +5255-5-747-3800 (ext. 3966) (L.G.-M.); +5255-5-520-9900 (ext. 160) (G.E.-G.)
| |
Collapse
|
2
|
Abstract
Vessel formation has been extensively studied at the tissue level, but the difficulty in imaging the endothelium with cellular resolution has hampered study of the morphogenesis and behavior of endothelial cells (ECs) in vivo. We are using endothelial-specific transgenes and high-resolution imaging to examine single ECs in zebrafish. By generating mosaics with transgenes that simultaneously mark endothelial nuclei and membranes we are able to definitively identify and study the morphology and behavior of individual ECs during vessel sprouting and lumen formation. Using these methods, we show that developing trunk vessels are composed of ECs of varying morphology, and that single-cell analysis can be used to quantitate alterations in morphology and dynamics in ECs that are defective in proper guidance and patterning. Finally, we use single-cell analysis of intersegmental vessels undergoing lumen formation to demonstrate the coexistence of seamless transcellular lumens and single or multicellular enclosed lumens with autocellular or intercellular junctions, suggesting that heterogeneous mechanisms contribute to vascular lumen formation in vivo. The tools that we have developed for single EC analysis should facilitate further rigorous qualitative and quantitative analysis of EC morphology and behavior in vivo.
Collapse
Affiliation(s)
- Jianxin A Yu
- Program in Genomics of Differentiation, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
| | - Daniel Castranova
- Program in Genomics of Differentiation, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
| | - Van N Pham
- Program in Genomics of Differentiation, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
| | - Brant M Weinstein
- Program in Genomics of Differentiation, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
| |
Collapse
|
3
|
Katayama Y. [Bone metabolism and cardiovascular function update. Inter-communication between bone marrow hematopoiesis and skeletal/vascular network]. Clin Calcium 2014; 24:69-76. [PMID: 24976058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The hematopoiesis takes place in the bone marrow. Because bone marrow is the "marrow" of the bone, bone marrow does not exist without bone. The specialized microenvironment for hematopoietic stem cells (HSCs) to be appropriately functional is called "niche" . In the recent ten years since the bone-forming osteoblast was identified as a HSC niche, the entire mesenchymal lineage cells from mesenchymal stem cells to end-terminal osteocytes have been recognized as niche cells or niche-modulators. Among these, mesenchymal stem/progenitor cells are located at perivascular area. The very recent study showed the difference between arteriolar and sinusoidal niches. It is likely that the vascular network and the bone tissue are connected by the mesenchymal lineage cells as a complex of bone forming system, and HSCs utilize this complex as a series of niche.
Collapse
Affiliation(s)
- Yoshio Katayama
- Hematology, Department of Medicine, Kobe University Hospital, Japan
| |
Collapse
|
4
|
Bryson JL, Griffith AV, Hughes III B, Saito F, Takahama Y, Richie ER, Manley NR. Cell-autonomous defects in thymic epithelial cells disrupt endothelial-perivascular cell interactions in the mouse thymus. PLoS One 2013; 8:e65196. [PMID: 23750244 PMCID: PMC3672159 DOI: 10.1371/journal.pone.0065196] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 04/26/2013] [Indexed: 12/03/2022] Open
Abstract
The thymus is composed of multiple stromal elements comprising specialized stromal microenvironments responsible for the development of self-tolerant and self-restricted T cells. Here, we investigated the ontogeny and maturation of the thymic vasculature. We show that endothelial cells initially enter the thymus at E13.5, with PDGFR-β+ mesenchymal cells following at E14.5. Using an allelic series of the thymic epithelial cell (TEC) specific transcription factor Foxn1, we showed that these events are delayed by 1–2 days in Foxn1Δ/Δ mice, and this phenotype was exacerbated with reduced Foxn1 dosage. At subsequent stages there were fewer capillaries, leaky blood vessels, disrupted endothelium - perivascular cell interactions, endothelial cell vacuolization, and an overall failure of vascular organization. The expression of both VEGF-A and PDGF-B, which are both primarily expressed in vasculature-associated mesenchyme or endothelium in the thymus, were reduced at E13.5 and E15.5 in Foxn1Δ/Δ mice compared with controls. These data suggest that Foxn1 is required in TECs both to recruit endothelial cells and for endothelial cells to communicate with thymic mesenchyme, and for the differentiation of vascular-associated mesenchymal cells. These data show that Foxn1 function in TECs is required for normal thymus size and to generate the cellular and molecular environment needed for normal thymic vascularization. These data further demonstrate a novel TEC-mesenchyme-endothelial interaction required for proper fetal thymus organogenesis.
Collapse
Affiliation(s)
- Jerrod L. Bryson
- Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America
| | - Ann V. Griffith
- Department of Carcinogenesis, University of Texas, M.D. Anderson Cancer Center, Science Park Research Division, Smithville, Texas, United States of America
| | - Bernard Hughes III
- Department of Genetics, University of Georgia, Athens, Georgia, United States of America
| | - Fumi Saito
- Division of Experimental Immunology, Institute for Genome Research, University of Tokushima, Tokushima, Japan
| | - Yousuke Takahama
- Division of Experimental Immunology, Institute for Genome Research, University of Tokushima, Tokushima, Japan
| | - Ellen R. Richie
- Department of Carcinogenesis, University of Texas, M.D. Anderson Cancer Center, Science Park Research Division, Smithville, Texas, United States of America
| | - Nancy R. Manley
- Department of Genetics, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
| |
Collapse
|
5
|
Faĭtel'son AV, Koklina NI, Gudyrev OS, Dubrovin GM, Pokrovskiĭ MV, Ivanov AV. [Comparative evaluation of the osteoprotective effects of resveratrol and resveratrol/enalapril combination in the treatment of experimental osteoporosis]. Eksp Klin Farmakol 2012; 75:35-38. [PMID: 22834128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The osteoprotective effect of resveratrol and a combination of resveratrol with enalapril has been investigated in white Wistar female rats with experimental osteoporosis. It is established that, in rats after ovariectomy, the endothelial dysfunction of microcirculation vessels of the osteal tissue is developed, resulting in the occurrence of osteoporosis. Resveratrol and the combination of resveratrol with enalapril prevented depression of the microcirculation level in the osteal tissue, thus preventing the thinning of osteal trabecules and preventing their microfractures.
Collapse
|
6
|
Zu J, Liu JJ. [Effects of aerobic exercise training on the changes of endothelium-dependent relaxations in rat thoracic aorta rings and its mechanisms]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2012; 28:61-63. [PMID: 22493898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
|
7
|
Abstract
The microvessels of skeletal muscle were examined electron microscopically in a case of systemic capillary leak syndrome (SCLS). One biopsy was taken in a free interval of the disease and one about 6 hours after the onset of an attack with hypovolemia. The microvascular endothelium exhibited a large number of multivesicular bodies, especially in the specimen obtained during an attack. Possibly this indicates a high heterophagic activity of the endothelium. A blebbing of the luminal surface of arteriolar endothelium was observed in the attack specimen. Since a complement activation seemed to occur during attacks, the blebbing is tentatively interpreted as a sign of a complement-mediated injury to the endothelium, leading to a breakdown of the endothelial barrier. This mechanism might explain the dramatic increase of microvascular permeability to plasma proteins during an attack of SCLS. The findings did not indicate that the increase might depend on some disturbance of the transendothelial vesicular transport function, nor could any openings of endothelial junctions, as in inflammation, be demonstrated. Regionally the periendothelial basal lamina appeared thickened, a finding which seems common in angiopathies of different kinds.
Collapse
|
8
|
Hightower CM, Intaglietta M. Early iNOS impairment and late eNOS enhancement during reperfusion following 2.49 MHz continuous ultrasound exposure after ischemia. Ultrason Sonochem 2009; 16:197-203. [PMID: 18595762 PMCID: PMC2579745 DOI: 10.1016/j.ultsonch.2008.05.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Revised: 05/03/2008] [Accepted: 05/17/2008] [Indexed: 05/25/2023]
Abstract
OBJECTIVE Ischemia reperfusion (IR) injury, occurring during heart attacks, hemorrhagic shock, and bypass and transplant surgeries, impairs microcirculatory function and nitric oxide (NO) synthesis. We report the regulation of endothelial and inducible NO synthase (eNOS and iNOS) proteins as a consequence of the application of continuous mode diagnostic frequency ultrasound application following IR injury. METHODS Animals were assigned to one of five groups for microcirculatory assessment or Western blot analysis (WB) as follows: (1) IR+iNOS inhibition (1400W); and (2) IR+1400W+ultrasound for microcirculatory assessment, (3) Control; (4) IR; and (5) IR+ultrasound for WB. Functional capillary density and microvascular diameter, flow velocity, and flow were monitored for microcirculatory assessment. Skin tissue samples were harvested for WB. 2.49MHz continuous ultrasound was used for application. RESULTS Both the inhibition of iNOS alone and iNOS inhibition with ultrasound irradiation positively influenced the microcirculation of observed animals relative to baseline values. Ultrasound exposure resulted in a significant production of eNOS protein in skin tissue harvested 24h into reperfusion (p<0.01). iNOS levels from the same tissue of ultrasound exposed animals were found to be significantly decreased 0.5h into reperfusion (p<0.05). CONCLUSION Protection from lasting IR injury effects in the microcirculation, with continuous mode diagnostic frequency ultrasound, results from augmented eNOS protein levels during late reperfusion. Ultrasound inhibited iNOS protein production during early reperfusion may also confer protection from IR injury.
Collapse
Affiliation(s)
- C Makena Hightower
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093-0412, United States.
| | | |
Collapse
|
9
|
Butcher EC, Weissman IL. Cellular, genetic, and evolutionary aspects of lymphocyte interactions with high-endothelia venules. Ciba Found Symp 2008; 71:265-86. [PMID: 6899991 DOI: 10.1002/9780470720547.ch14] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
10
|
Venturoli D, Rippe B. Is there a price to pay for the simplicity of the three-pore model? Perit Dial Int 2008; 28:25-27. [PMID: 18178943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Affiliation(s)
- Daniele Venturoli
- Department of Nephrology, Lund University, University Hospital of Lund, Lund, Sweden
| | | |
Collapse
|
11
|
Pezzatini S, Morbidelli L, Solito R, Paccagnini E, Boanini E, Bigi A, Ziche M. Nanostructured HA crystals up-regulate FGF-2 expression and activity in microvascular endothelium promoting angiogenesis. Bone 2007; 41:523-34. [PMID: 17681892 DOI: 10.1016/j.bone.2007.06.016] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 05/04/2007] [Accepted: 06/17/2007] [Indexed: 01/08/2023]
Abstract
In mineralized tissue the process of angiogenesis is required for normal osteogenesis during bone repair and in reconstructive and substitutive surgery, for proper biomaterial/tissue integration. Nanotechnologies have been proposed to improve the compatibility of biomaterials for use in orthopaedic and reconstructive surgery (e.g., nanocrystals). The aim of this study was to determine the effect of nanostructured hydroxyapatite (HA) on angiogenesis. Microvascular endothelial cell survival, proliferation and migration, crucial events in the angiogenic process, were evaluated together with cytoskeleton and biochemical signalling markers. Induction of migration, metalloproteinase (MMP-2) and focal adhesion Kinase (FAK) activity documented the ability of HA nanocrystals to stimulate capillary endothelium toward an angiogenic phenotype. HA concentrations, ranging from 2 to 10 microg/ml, promoted endothelium survival and proliferation, preserved alphavbeta3-integrin localization, stimulated beta-actin reorganization and Akt phosphorylation (98% vs control). Immunoassays for key signalling pathways in angiogenesis (i.e., endothelial nitric oxide synthase (eNOS) and fibroblast growth factor-2 (FGF-2)) demonstrated that HA increased their expression. Moreover, quantitative RT-PCR and Western blotting analysis confirmed that HA nanocrystals exposure up-regulated FGF-2 mRNA by 6 fold and increased 18 kDa protein isoform by 40%. HA enhanced cell responsiveness to vascular endothelial growth factor (VEGF) in terms of NOS activity (1.5 fold over control), increasing the ability of microvascular endothelium to differentiate into capillary-like structures when grown in 3D fibrin gel. In conclusion our data document the proangiogenic properties of HA nanocrystals. This material stimulates endothelial cell functions and biochemical pathways to an extent similar to VEGF, and primes them to VEGF stimulation, leading to differentiation in pseudocapillary formations in 3D matrices.
Collapse
Affiliation(s)
- Silvia Pezzatini
- Section of Pharmacology, Department of Molecular Biology, University of Siena, Via A. Moro 2, 53100 Siena, Italy
| | | | | | | | | | | | | |
Collapse
|
12
|
Grenier G, Scimè A, Le Grand F, Asakura A, Perez-Iratxeta C, Andrade-Navarro MA, Labosky PA, Rudnicki MA. Resident endothelial precursors in muscle, adipose, and dermis contribute to postnatal vasculogenesis. Stem Cells 2007; 25:3101-10. [PMID: 17823241 DOI: 10.1634/stemcells.2006-0795] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel population of tissue-resident endothelial precursors (TEPs) was isolated from small blood vessels in dermal, adipose, and skeletal muscle of mouse based on their ability to be grown as spheres. Cellular and molecular analyses of these cells revealed that they were highly related regardless of the tissue of origin and distinct from embryonic neural stem cells. Notably, TEPs did not express hematopoietic markers, but they expressed numerous characteristics of angiogenic precursors and their differentiated progeny, such as CD34, Flk-1, Tie-1, CD31, and vascular endothelial cadherin (VE-cadherin). TEPs readily differentiated into endothelial cells in newly formed vascular networks following transplantation into regenerating skeletal muscle. Taken together, these experiments suggest that TEPs represent a novel class of endothelial precursors that are closely associated with small blood vessels in muscle, adipose, and dermal tissue. This finding is of particular interest since it could bring new insight in cancer angiogenesis and collateral blood vessels developed following ischemia. Disclosure of potential conflicts of interest is found at the end of this article.
Collapse
Affiliation(s)
- Guillaume Grenier
- Sprott Centre for Stem Cell Research, Ottawa Health Research Institute, 501 Smyth Road, Ottawa, Ontario K1H 8L6, Canada
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Liu Y, Wang Z, Yu H, Wang F, Liu S, Cui Y. [The expression of FasL and ICAM-1 on the HEVs in the hypertrophic tonsils]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2007; 21:700-702. [PMID: 17969524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
OBJECTIVE To investigate the expression of FasL and ICAM-1 on the HEVs in the hypertrophic tonsils and its clinical significance. METHOD Under the light microscopy, HE and immunohistochemistry methods were used to show the morphology of HEVs, the number of T, B lymphocytes, the expression intensity of FasL and ICAM-1 in 17 patients with the idiopathic tonsillar hypertrophy (ITH) and in 20 patients with the chronic hypertrophic tonsillitis (CHT). RESULT The expression intensity of ICAM-1 on the tonsillar HEVs in ITH group was significantly lower than that in CTH group (P < 0.05), but the intensity of FasL in ITH group was significantly higher than that in CHT group (P < 0.05). CONCLUSION FasL and ICAM-1 expression in the tonsillar HEVs contribute to the CHT and ITH. The former mainly makes IHT developed, and the latter promotes the process of the inflammation.
Collapse
Affiliation(s)
- Yang Liu
- Department of Otorhinolaryngology, Head and Neck Surgery,Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | | | | | | | | | | |
Collapse
|
14
|
Prisby RD, Ramsey MW, Behnke BJ, Dominguez JM, Donato AJ, Allen MR, Delp MD. Aging reduces skeletal blood flow, endothelium-dependent vasodilation, and NO bioavailability in rats. J Bone Miner Res 2007; 22:1280-8. [PMID: 17451371 DOI: 10.1359/jbmr.070415] [Citation(s) in RCA: 131] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
UNLABELLED We determined whether aging diminishes bone blood flow and impairs endothelium-dependent vasodilation. Femoral perfusion was lower in old animals, as well as endothelium-dependent vasodilation and NO bioavailability. These effects could contribute to old age-related bone loss and the increased risk of fracture. INTRODUCTION Aging has been shown to diminish bone blood flow in rats and humans. The purpose of this study was to determine whether blood flow to regions of the femur perfused primarily through the principal nutrient artery (PNA) are diminished with aging and whether this putative reduction in flow is associated with impaired endothelium-dependent vasodilation. MATERIALS AND METHODS Blood flow was measured in conscious young adult (4-6 mo old) and aged (24-26 mo old) male Fischer-344 rats using radiolabeled microspheres. Endothelium-dependent vasodilation of the PNA was assessed in vitro using acetylcholine (ACh), whereas the contribution of the NO synthase (NOS) and cyclooxygenase (COX) signaling pathways to endothelium-dependent vasodilation was determined using the NOS and COX inhibitors L-NAME and indomethacin, respectively. RESULTS Femoral blood flow in the aged rats was 21% and 28% lower in the proximal and distal metaphyses, respectively, and 45% lower in the diaphyseal marrow. Endothelium-dependent vasodilation was reduced with old age (young: 83 +/- 6% maximal relaxation; aged: 62 +/- 5% maximal relaxation), whereas endothelium-independent vasodilation (sodium nitroprusside) was unaffected by age. The reduction in endothelium-dependent vasodilation was mediated through impairment of the NOS signaling pathway, which resulted in lower NO bioavailability (young: 168 +/- 56 nM; aged: 50 +/- 7 nM). CONCLUSIONS These data show that reductions in metaphyseal bone and diaphyseal marrow perfusion with old age are associated with diminished endothelium-dependent vasodilation through an impairment of the NOS mechanism. Such age-related changes in bone perfusion and vascular NO signaling could impact clinical bone loss, increase risk of fracture, and impair fracture healing in the elderly.
Collapse
Affiliation(s)
- Rhonda D Prisby
- Division of Exercise Physiology, Department of Physiology and Pharmacology, and the Center for Interdisciplinary Research in Cardiovascular Sciences, West Virginia University School of Medicine, Morgantown, West Virginia 26506, USA
| | | | | | | | | | | | | |
Collapse
|
15
|
Zennadi R, Moeller BJ, Whalen EJ, Batchvarova M, Xu K, Shan S, Delahunty M, Dewhirst MW, Telen MJ. Epinephrine-induced activation of LW-mediated sickle cell adhesion and vaso-occlusion in vivo. Blood 2007; 110:2708-17. [PMID: 17609430 PMCID: PMC1988948 DOI: 10.1182/blood-2006-11-056101] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Sickle red cell (SS RBC) adhesion is believed to contribute to the process of vaso-occlusion in sickle cell disease (SCD). We previously found that the LW RBC adhesion receptor can be activated by epinephrine to mediate SS RBC adhesion to endothelial alphavbeta3 integrin. To determine the contribution of LW activation to vaso-occlusive events in vivo, we investigated whether in vitro treatment of SS RBCs by epinephrine resulted in vaso-occlusion in intact microvasculature after RBC infusion into nude mice. Epinephrine enhanced human SS but not normal RBC adhesion to murine endothelial cells in vitro and to endothelium in vivo, promoting vaso-occlusion and RBC organ sequestration. Murine sickle RBCs also responded to epinephrine with increased adhesion to postcapillary endothelium in nude mice. Epinephrine-induced SS RBC adhesion, vaso-occlusion, and RBC organ trapping could be prevented by the beta-adrenergic receptor (beta-AR) antagonist, propranolol. Infusion of soluble recombinant LW also significantly reduced adhesion and vaso-occlusion. In addition, epinephrine-treated SS RBCs induced activation of murine leukocyte adhesion to endothelium as well. We conclude that LW activation by epinephrine via beta-AR stimulation can promote both SS RBC and leukocyte adhesion as well as vaso-occlusion, suggesting that both epinephrine and LW play potentially pathophysiological roles in SCD.
Collapse
Affiliation(s)
- Rahima Zennadi
- Division of Hematology and Duke Comprehensive Sickle Cell Center, Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Zhang AL, Yang Z, Xiao L, Li DJ, Niu LW. [Regulatory effects of RhoGTPase on transition of liver sinusoidal capillarization: experiment with mice of schistosomal hepatic fibrosis]. Zhonghua Yi Xue Za Zhi 2007; 87:1564-9. [PMID: 17785114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
OBJECTIVE To investigate the regulatory effects of RhoGTPase on the transition of liver sinusoidal endothelial cells and the potential mechanism thereof on the sinusoidal capillarization in schistosomal hepatic fibrosis. METHODS Eight-eight mice underwent abdominal infection of schistosomal cercaria so as to establish liver fibrosis models. 13 weeks later the mice were divided into 5 groups: Group A (normal control group, n = 10), Group B (group of schistosomiasis, n = 24), Group C (anti-schistosoma control group, treated with biltricide), Group D (group of schistosomiasis + hydroxyfasudil, treated with hydroxyfasudil since the week 14, n = 18), and Group E (biltricide + hydroxyfasudil, treated with biltricide since week 13 and added with hydroxyfasudil since week 14, n = 18). The mice in Group A and 6 mice of Group B were killed in week 13, and 6 mice of Groups B, C, D, and E were killed in weeks 16, 19, and 21 each. The livers were taken out to undergo electron microcopy. Immunohistochemistry was used to detect the expression of p-moesin, connective tissue growth factor (CTGF), RhoA, collagen IV (Col IV), and laminin (LN) protein expressions were assessed by Western blotting, and RT-PCR was used to detect the mRNA expression of CTGF, RhoA, and ROCK II. RESULTS Compared with Group A, the mRNA levels of RhoA, ROCK II, and CTGF were significantly increased (all P < 0.05) and the protein expression levels of p-moesin, CTGF, RhoA, Col IV, and LN were significantly increased (all P < 0.05) in Group B. After intervention with biltricide and/or hydroxyfasudil, the CTGF mRNA expression was significantly decreased (P < 0.05) in Group E in week 16 and the protein expression levels of CTGF, Col IV, and LN were decreased (all P < 0.05) compared with other groups, and the expression of p-moesin of Group E was significantly lower than that of Group D (P < 0.05). Electron microcopy showed that the liver sinusoids of the mice in Group E was significantly better compared with the other groups, and there was no significant difference between Groups B and D. CONCLUSION An upregulation of RhoGTPase that contributes to increased CTGF expression and phosphorylation of moesin may induce a transition of liver sinusoidal endothelial cells in schistosomiasis.
Collapse
Affiliation(s)
- Ai-long Zhang
- Department of General Surgery, Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, China
| | | | | | | | | |
Collapse
|
17
|
Ai D, Fu Y, Guo D, Tanaka H, Wang N, Tang C, Hammock BD, Shyy JYJ, Zhu Y. Angiotensin II up-regulates soluble epoxide hydrolase in vascular endothelium in vitro and in vivo. Proc Natl Acad Sci U S A 2007; 104:9018-23. [PMID: 17495027 PMCID: PMC1885620 DOI: 10.1073/pnas.0703229104] [Citation(s) in RCA: 131] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Epoxyeicosatrienoic acids (EETs), as metabolites of arachidonic acid, may function as antihypertensive and antiatherosclerotic mediators for vasculature. EETs are degraded by soluble epoxide hydrolase (sEH). Pharmacological inhibition and genetic ablation of sEH have been shown to increase the level of EETs, and treating angiotensin II (Ang II)-infused hypertension rats with sEH-selective inhibitors increased the levels of EETs, with attendant decrease in systolic blood pressure. To elucidate the mechanisms by which Ang II regulates sEH expression, we treated human umbilical vein endothelial cells (ECs) and bovine aortic ECs with Ang II and found increased sEH expression at both the mRNA and protein levels. Transient transfection assays showed that the activity of the human sEH promoter was increased in ECs in response to Ang II. Further analysis of the promoter region of the sEH gene demonstrated that treatment with Ang II, like overexpression of c-Jun/c-Fos, activates the sEH promoter through an AP-1-binding motif. The binding of c-Jun to the AP-1 site of the sEH promoter was confirmed by chromatin immunoprecipitation assays. In contrast, adenovirus overexpression of the dominant-negative mutant of c-Jun significantly attenuated the effects of Ang II on sEH induction. An elevated level of sEH was found in the aortic intima of both spontaneously hypertensive rats and Ang II-infused Wistar rats. Blocking Ang II binding to Ang II receptor 1 by losartan abolished the sEH induction. Thus, AP-1 activation is involved in the transcriptional up-regulation of sEH by Ang II in ECs, which may contribute to Ang II-induced hypertension.
Collapse
Affiliation(s)
- Ding Ai
- *Department of Physiology and Pathophysiology, Health Science Center, Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, and
| | - Yi Fu
- *Department of Physiology and Pathophysiology, Health Science Center, Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, and
| | - Deliang Guo
- Division of Biomedical Sciences, University of California, Riverside, CA 92521; and
| | - Hiromasa Tanaka
- Department of Entomology and Cancer Research Center, University of California, Davis, CA 95616
| | - Nanping Wang
- Institute of Cardiovascular Research, Peking University, Beijing 100083, China
| | - Chaoshu Tang
- *Department of Physiology and Pathophysiology, Health Science Center, Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, and
| | - Bruce D. Hammock
- Department of Entomology and Cancer Research Center, University of California, Davis, CA 95616
- To whom correspondence may be addressed. E-mail: , , or
| | - John Y.-J. Shyy
- Division of Biomedical Sciences, University of California, Riverside, CA 92521; and
- To whom correspondence may be addressed. E-mail: , , or
| | - Yi Zhu
- *Department of Physiology and Pathophysiology, Health Science Center, Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, and
- To whom correspondence may be addressed. E-mail: , , or
| |
Collapse
|
18
|
Abstract
Colorectal cancer (CRC) is a common malignant disease and the severe nature of cases in men and women who develop colorectal cancer makes this an important socio-economic health issue. Major challenges such as understanding and modeling colorectal cancer pathways rely on our understanding of simple models such as outlined in this paper. We discuss that the development of novel standardized approaches of multidimensional (correlative) biomolecular microscopy methods facilitates the collection of (sub) cellular tissue information in the early onset of colorectal liver metastasis and that this approach will be crucial in designing new effective strategies for CRC treatment. The application of X-ray micro-computed tomography and its potential in correlative imaging of the liver vasculature will be discussed.
Collapse
|
19
|
Wang HB, Leng JH, Zhu L, Liu ZF, Sun DW, Lang JH. [The chick embryo chorioallantioc membrane as a model for in vivo research on anti-angiogenesis in endometriosis]. Zhonghua Fu Chan Ke Za Zhi 2007; 42:43-7. [PMID: 17331421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
OBJECTIVE To establish the chick embryo chorioallantioc membrane (CAM) as a model for in vivo research on endometriosis. The model was used to investigate the mechanism of anti-vascular endothelial growth factor (VEGF) antibody for treatment of endometriosis. METHODS Human endometrial fragments were explanted onto the CAM. Then anti-VEGF antibody was used for the endometriosis-like lesions after transplantation of human endometrial fragments. The CAM models were treated respectively as control groups and experimental groups. The terminal deoxynucleotidyl transferase-mediated biotin-deoxyuridine triphosphate (dUTP) nick end labeling (TUNEL), proliferating cell nuclear antigen (PCNA) and microvessel density (MVD) were used in vivo for analysis of anti-angiogenesis. RESULTS The apoptosis intensity of anti-VEGF antibody treated groups (6.7 +/- 0.9, 6.9 +/- 0.8) was significantly higher than that of the control groups (5.0 +/- 0.9, 5.4 +/- 1.1; P < 0.05). The proliferation intensity was not different in these groups. Lower MVD was observed in experimental groups [(4.2 +/- 1.1), (4.9 +/- 1.2) vessels] than the control groups [(6.9 +/- 1.6), (9.1 +/- 3.0) vessels; P < 0.05]. CONCLUSIONS CAM is an extraembryonic membrane that is commonly used in vivo for the study of angiogenesis and anti-angiogenesis. Anti-VEGF antibody can be used to accelerate apoptosis of the endometrial cells and vascular endothelium cells, but it has no effect on the proliferation of these cells.
Collapse
Affiliation(s)
- Han-bi Wang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | | | | | | | | | | |
Collapse
|
20
|
Nunes SS, Outeiro-Bernstein MAFD, Juliano L, Vardiero F, Nader HB, Woods A, Legrand C, Morandi V. Syndecan-4 contributes to endothelial tubulogenesis through interactions with two motifs inside the pro-angiogenic N-terminal domain of thrombospondin-1. J Cell Physiol 2007; 214:828-37. [PMID: 17879962 DOI: 10.1002/jcp.21281] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Thrombospondin-1 (TSP-1) is an extracellular matrix protein that modulates focal adhesion in mammalian cells and exhibits dual roles in angiogenesis. In a previous work, we showed that a recombinant 18 kDa protein encompassing the N-terminal residues 1-174 of human TSP-1 (TSP18) induced tubulogenesis of human umbilical vein endothelial cells and protected them from apoptosis. Our results indicated that these effects were possibly mediated by syndecan-4 proteoglycan, since binding of TSP18 to endothelial extracts was inhibited by anti-syndecan-4 antibody. Syndecan-4 is a heparan-sulfate proteoglycan that regulates cell-matrix interactions and is the only member of its family present in focal adhesions. In this report, we demonstrate that a monoclonal antibody against syndecan-4 blocks TSP18-induced tubulogenesis. Furthermore, through 2D adhesion and 3D angiogenic assays, we demonstrate that two sequences, TSP Hep I and II, retain the major pro-angiogenic activity of TSP18. These TSP-1 motifs also compete with the fibronectin Hep II domain for binding to syndecan-4 on endothelial cell surface, indicating that they may exert their effects by interfering with the recognition of fibronectin by syndecan-4. Additionally, TSP18 and its derived peptides activate the PKC-dependent Akt-PKB signaling pathway. Blockage of PKC activation prevented HUVEC spreading when seeded on TSP18 fragment, and on TSP Hep I and TSP Hep II peptides, but not on gelatin-coated substrates. Our results identify syndecan-4 as a novel receptor for the N-terminus of TSP-1 and suggest that TSP-1 N-terminal pro-angiogenic activity is linked to its capacity of interfering with syndecan-4 functions in the course of cell adhesion.
Collapse
Affiliation(s)
- Sara Santana Nunes
- Departamento de Biologia Celular e Genética, Laboratório de Biologia da Célula Endotelial e da Angiogênese (LabAngio), Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, UERJ, Rio de Janeiro, RJ, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Straub AC, Stolz DB, Ross MA, Hernández-Zavala A, Soucy NV, Klei LR, Barchowsky A. Arsenic stimulates sinusoidal endothelial cell capillarization and vessel remodeling in mouse liver. Hepatology 2007; 45:205-12. [PMID: 17187425 PMCID: PMC1764828 DOI: 10.1002/hep.21444] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
UNLABELLED Trivalent arsenic [As(III)] is a well-known environmental toxicant that causes a wide range of organ-specific diseases and cancers. In the human liver, As(III) promotes vascular remodeling, portal fibrosis, and hypertension, but the pathogenesis of these As(III)-induced vascular changes is unknown. To investigate the hypothesis that As(III) targets the hepatic endothelium to initiate pathogenic change, mice were exposed to 0 or 250 parts per billion (ppb) of As(III) in their drinking water for 5 weeks. Arsenic(III) exposure did not affect the overall health of the animals, the general structure of the liver, or hepatocyte morphology. There was no change in the total tissue arsenic levels, indicating that arsenic does not accumulate in the liver at this level of exposure. However, there was significant vascular remodeling with increased sinusoidal endothelial cell (SEC) capillarization, vascularization of the peribiliary vascular plexus (PBVP), and constriction of hepatic arterioles in As(III)-exposed mice. In addition to ultrastructural demonstration of SEC defenestration and capillarization, quantitative immunofluorescence analysis revealed increased sinusoidal PECAM-1 and laminin-1 protein expression, suggesting gain of adherens junctions and a basement membrane. Conversion of SECs to a capillarized, dedifferentiated endothelium was confirmed at the cellular level with demonstration of increased caveolin-1 expression and SEC caveolae, as well as increased membrane-bound Rac1-GTPase. CONCLUSION These data demonstrate that exposure to As(III) causes functional changes in SEC signaling for sinusoidal capillarization that may be initial events in pathogenic changes in the liver.
Collapse
Affiliation(s)
- Adam C. Straub
- From the Department of Occupational and Environmental Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA
| | - Donna B. Stolz
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA
| | - Mark A. Ross
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA
| | - Araceli Hernández-Zavala
- Center for Environmental and Molecular Biology of the Lung, University of North Carolina, Chapel Hill, NC; and
| | | | - Linda R. Klei
- From the Department of Occupational and Environmental Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA
| | - Aaron Barchowsky
- From the Department of Occupational and Environmental Health, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA
- Address reprint requests to: Aaron Barchowsky, Ph.D., University of Pittsburgh Graduate School of Public Health, Department of Occupational and Environmental Health, Bridgeside Point, 100 Technology Drive, Rm 332, Pittsburgh, PA 15219. E-mail: ; fax: 412-624-9361
| |
Collapse
|
22
|
Brodskaia TA, Nevzorova VA, Gel'tser BI, Motkina EV. [Endothelial dysfunction and respiratory diseases]. TERAPEVT ARKH 2007; 79:76-84. [PMID: 17526203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
|
23
|
Gaca JG, Appel JZ, Lukes JG, Gonzalez-Stawinski GV, Lesher A, Palestrant D, Logan JS, Love SD, Holzknecht ZE, Platt JL, Parker W, Davis RD. Effect of an anti-C5a monoclonal antibody indicates a prominent role for anaphylatoxin in pulmonary xenograft dysfunction. Transplantation 2006; 81:1686-94. [PMID: 16794535 DOI: 10.1097/01.tp.0000226063.36325.02] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND In contrast to renal or cardiac xenografts, the inhibition of complement using cobra venom factor (CVF) accelerates pulmonary xenograft failure. By activating C3/C5 convertase, CVF depletes complement while additionally generating C5a and other anaphylatoxins, to which pulmonary xenografts may be uniquely susceptible. The current study investigates the role of C5a in pulmonary xenograft failure in baboons. METHODS Left orthotopic pulmonary xenografts using swine lungs expressing human CD46 were performed in baboons receiving: I) no other treatment (n=4), II) immunodepletion (n=5), and III) immunodepletion plus a single dose of mouse anti-human C5a monoclonal antibody (anti-C5a, 0.6 mg/kg administered intravenously) (n=3). The extent to which anti-C5a inhibits baboon C5a was assessed in vitro using a hemolytic reaction involving baboon serum and porcine red blood cells and by ELISA. RESULTS Baboons in Group III exhibited significantly prolonged xenograft survival (mean=722+/-121 min, P=0.02) compared to baboons in Group I (mean=202+/-24 min) and Group II (mean=276+/-79 min). Furthermore, baboons in Groups I and II experienced pronounced hemodynamic compromise requiring inotropic support whereas those in Group III remained hemodynamically stable throughout experimentation without the need for additional pharmacologic intervention. CONCLUSIONS These findings indicate that C5a exacerbates pulmonary xenograft injury and compromises recipient hemodynamic status. Moreover, blockade of anaphylatoxins, such as C5a, offers a promising approach for future investigations aimed at preventing pulmonary xenograft injury in baboons.
Collapse
Affiliation(s)
- Jeffrey G Gaca
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Abstract
Nitric oxide plays a crucial role in cardiovascular homeostasis, with important vasodilatory, anti-thrombotic and anti-atherogenic properties. Beta-adrenergic receptors (betaARs), present on a wide variety of cardiovascular cells, including vascular endothelial cells, platelets, cardiac myocytes and leukocytes, have long been established as key players in maintaining cardiovascular homeostatic control. During the last few years a wealth of evidence has emerged which directly links stimulation of these cardiovascular betaARs to nitric oxide (NO) generation, suggesting a new and important mechanism of adrenergic control of cardiovascular function. This review explores the cardiovascular cell systems in which this coupling of betaARs and NO occurs, the intracellular signalling and regulatory mechanisms involved and the abnormalities in betaAR-NO oxide coupling found in cardiovascular disease states.
Collapse
Affiliation(s)
- L R Queen
- Department of Clinical Pharmacology, King's College London, 2.38 New Hunt's House, Guy's Campus, London, SE1 1UL, United Kingdom.
| | | |
Collapse
|
25
|
Mateo T, Abu Nabah YN, Abu Taha M, Mata M, Cerdá-Nicolás M, Proudfoot AEI, Stahl RAK, Issekutz AC, Cortijo J, Morcillo EJ, Jose PJ, Sanz MJ. Angiotensin II-induced mononuclear leukocyte interactions with arteriolar and venular endothelium are mediated by the release of different CC chemokines. J Immunol 2006; 176:5577-86. [PMID: 16622027 DOI: 10.4049/jimmunol.176.9.5577] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Angiotensin II (Ang-II) is associated with atherogenesis and arterial subendothelial mononuclear leukocyte infiltration. We have demonstrated that Ang-II causes the initial attachment of mononuclear cells to the arteriolar endothelium. We now report on the contribution of CC chemokines to this response. Intraperitoneal administration of 1 nM Ang-II induced MCP-1, RANTES, and MIP-1alpha generation, maximal at 4 h, followed by mononuclear leukocyte recruitment at 8 and 24 h. Using intravital microscopy within the rat mesenteric microcirculation 4 h after exposure to 1 nM Ang-II, arteriolar mononuclear cell adhesion was 80-90% inhibited by pretreatment with Met-RANTES, a CCR1 and CCR5 antagonist, or an anti-MCP-1 antiserum, without affecting the increased endothelial expression of P-selectin and VCAM-1. Conversely, leukocyte interactions with the venular endothelium, although inhibited by Met-RANTES, were little affected by the anti-MCP-1. Using rat whole blood in vitro, Ang-II (100 nM) induced the expression of monocyte CD11b that was inhibited by Met-RANTES but not by anti-MCP-1. Stimulation of human endothelial cells (human umbilical arterial endothelial cells and HUVECs) with 1-1000 nM Ang-II, predominantly acting at its AT(1) receptor, induced the release of MCP-1 within 1 h, RANTES within 4 h, and MCP-3 within 24 h. Eotaxin-3, a natural CCR2 antagonist, was released within 1 h and may delay mononuclear cell responses to MCP-1. Therefore, Ang-II-induced mononuclear leukocyte recruitment at arterioles and venules is mediated by the production of different CC chemokines. Thus, Ang-II may be a key molecule in the initial attachment of mononuclear cells to the arterial endothelium in cardiovascular disease states where this event is a characteristic feature.
Collapse
Affiliation(s)
- Teresa Mateo
- Department of Pharmacology, Faculty of Medicine, University of Valencia, Avenida Blasco Ibañez 15, E-46010 Valencia, Spain
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Ibarra M, López-Guerrero JJ, Mejía-Zepeda R, Villalobos-Molina R. Endothelium-Dependent Inhibition of the Contractile Response Is Decreased in Aorta from Aged and Spontaneously Hypertensive Rats. Arch Med Res 2006; 37:334-41. [PMID: 16513481 DOI: 10.1016/j.arcmed.2005.06.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2004] [Accepted: 06/15/2005] [Indexed: 11/18/2022]
Abstract
BACKGROUND Stimulation of vascular 5-hydroxytryptamine-2C (5-HT(2c)) receptors produces contraction in rat aorta. We investigated the effect of aging on endothelium-dependent inhibition of contractile responses in thoracic aorta from normotensive Wistar Kyoto (WKY) and spontaneously hypertensive rats (SHR). METHODS Endothelium-intact and denuded aortic rings were prepared from young (7-9 weeks old) and senescent (65-70 weeks old) WKY and SHR rats. Changes in isometric tension elicited by 5-HT, in the absence or in the presence of N(G)-nitro-L-arginine methyl ester (L-NAME) or indomethacin were recorded. RESULTS In aorta from WKY and SHR, 5-HT elicited concentration-dependent contractions, which were increased by endothelium removal. The ability of endothelium to depress contractile response to 5-HT was found to be reduced in vessels from senescent animals, mainly in SHR. L-NAME increased the sensitivity and maximal effect to 5-HT in endothelium-intact but not in denuded aortic rings from young WKY rats. The effect of L-NAME was lower in young SHR compared with age-matched WKY rats, but it did not modify the response to 5-HT in senescent rats. Indomethacin did not affect contraction in arteries from young WKY or in denuded aortic rings from young SHR and aged WKY. In contrast, the inhibitor attenuated the response in endothelium-intact vessels from young SHR and aged WKY, and this effect was more marked in arteries with and without endothelium from senescent SHR. Thus, inhibition of cyclooxygenases by indomethacin revealed an enhanced endothelium-dependent modulation of contraction in senescent and hypertensive rats. CONCLUSIONS Results indicate that hypertension and aging decrease the negative modulator role of endothelium, in 5-HT-induced vasoconstriction in aorta from WKY and SHR. Data also point out that endothelial dysfunction involves an increased formation of vasoconstrictor prostanoids, which counteract nitric oxide effects. In addition, SHR endothelium releases contractile prostanoids at an early stage of hypertension, whereas in old SHR vascular smooth muscle also releases prostanoids, which contribute to 5-HT-induced contraction.
Collapse
Affiliation(s)
- Maximiliano Ibarra
- Laboratorio de Farmacología Cardiovascular, Unidad de Biomedicina, Facultad de Estudios Superiores-Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, México, México.
| | | | | | | |
Collapse
|
27
|
Leonard S, Murrant C, Tayade C, van den Heuvel M, Watering R, Croy BA. Mechanisms regulating immune cell contributions to spiral artery modification -- facts and hypotheses -- a review. Placenta 2006; 27 Suppl A:S40-6. [PMID: 16413937 DOI: 10.1016/j.placenta.2005.11.007] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2005] [Revised: 11/13/2005] [Accepted: 11/14/2005] [Indexed: 11/30/2022]
Abstract
Early during murine, human and porcine pregnancy, endometrium associated with developing placentae is enriched for uterine Natural Killer (uNK) cells. A shared role for uNK cells in each of these species is production of angiogenic growth factors. Many uNK cells are located in close proximity to or structurally integrated within the walls of endometrial vessels. In mice, uNK cells have been found essential for the initiation of pregnancy-associated spiral arterial modification through their production of interferon-gamma. Unique aspects of uNK cell interactions with decidual endothelium are being defined using cell and tissue transfer into pregnant, alymphoid mice, adhesion of viable lymphocytes to frozen uterine tissue sections under shear forces, laser capture microdissection of uNK cells for quantitative RNA analyses and intravital microscopy. These studies indicate that uterine lymphocytes have a fundamental and major importance in promotion of angiogenesis within implantation sites that is regulated by the reproductive hormone cycle. Further, this work suggests that the pro-inflammatory endometrial cytokine response seen when peri-implantation conceptuses arrest has, as its target for destruction, newly developed endometrial vasculature rather than fetal trophoblast.
Collapse
Affiliation(s)
- S Leonard
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada, N1G 2W1
| | | | | | | | | | | |
Collapse
|
28
|
Pouget C, Gautier R, Teillet MA, Jaffredo T. Somite-derived cells replace ventral aortic hemangioblasts and provide aortic smooth muscle cells of the trunk. Development 2006; 133:1013-22. [PMID: 16467362 DOI: 10.1242/dev.02269] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We have previously shown that endothelial cells of the aortic floor give rise to hematopoietic cells, revealing the existence of an aortic hemangioblast. It has been proposed that the restriction of hematopoiesis to the aortic floor is based on the existence of two different and complementary endothelial lineages that form the vessel: one originating from the somite would contribute to the roof and sides, another from the splanchnopleura would contribute to the floor. Using quail/chick orthotopic transplantations of paraxial mesoderm, we have traced the distribution of somite-derived endothelial cells during aortic hematopoiesis. We show that the aortic endothelium undergoes two successive waves of remodeling by somitic cells: one when the aortae are still paired, during which the initial roof and sides of the vessels are renewed; and a second, associated to aortic hematopoiesis, in which the hemogenic floor is replaced by somite endothelial cells. This floor thus appears as a temporary structure, spent out and replaced. In addition,the somite contributes to smooth muscle cells of the aorta. In vivo lineage tracing experiments with non-replicative retroviral vectors showed that endothelial cells do not give rise to smooth muscle cells. However, in vitro,purified endothelial cells acquire smooth muscle cells characteristics. Taken together, these data point to the crucial role of the somite in shaping the aorta and also give an explanation for the short life of aortic hematopoiesis.
Collapse
Affiliation(s)
- Claire Pouget
- Université Pierre et Marie Curie-Paris6, CNRS UMR7622, Laboratoire de Biologie du Développement, Bat C, 6 étage, Case 24, 75252 Paris Cedex 05, France
| | | | | | | |
Collapse
|
29
|
Abstract
Cardiovascular diseases account for more than half of total mortality before the age of 75 in industrialized countries. To develop therapies promoting the compensatory growth of blood vessels could be superior to palliative surgical interventions. Therefore, much effort has been put into investigating underlying mechanisms. Depending on the initial trigger, growth of blood vessels in adult organisms proceeds via two major processes, angiogenesis and arteriogenesis. While angiogenesis is induced by hypoxia and results in new capillaries, arteriogenesis is induced by physical forces, most importantly fluid shear stress. Consequently, chronically elevated fluid shear stress was found to be the strongest trigger under experimental conditions. Arteriogenesis describes the remodelling of pre-existing arterio-arteriolar anastomoses to completely developed and functional arteries. In both growth processes, enlargement of vascular wall structures was proposed to be covered by proliferation of existing wall cells. Recently, increasing evidence emerges, implicating a pivotal role for circulating cells, above all blood monocytes, in vascular growth processes. Since it has been shown that monocytes/ macrophage release a cocktail of chemokines, growth factors and proteases involved in vascular growth, their contribution seems to be of a paracrine fashion. A similar role is currently discussed for various populations of bone-marrow derived stem cells and endothelial progenitors. In contrast, the initial hypothesis that these cells -after undergoing a (trans-)differentiation- contribute by a structural integration into the growing vessel wall, is increasingly challenged.
Collapse
Affiliation(s)
- M Heil
- Max-Planck-Institute for Heart & Lung Research, Parkstrasse 1, 61231 Bad Nauheim, Germany.
| | | | | | | |
Collapse
|
30
|
Belardinelli R, Lacalaprice F, Faccenda E, Purcaro A, Perna G. Effects of short-term moderate exercise training on sexual function in male patients with chronic stable heart failure. Int J Cardiol 2005; 101:83-90. [PMID: 15860388 DOI: 10.1016/j.ijcard.2004.05.020] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2003] [Revised: 03/13/2004] [Accepted: 05/05/2004] [Indexed: 10/26/2022]
Abstract
BACKGROUND Patients with chronic heart failure (CHF) have sexual dysfunction that impairs quality of life. Recent trials have demonstrated that exercise training (ET) improves quality of life (QOL) of CHF patients, but it is not established whether this benefit may be associated with an improvement in sexual dysfunction. OBJECTIVE To determine whether ET can improve sexual dysfunction in patients with CHF. METHODS We prospectively studied 59 male patients (57+/-9 years) with stable CHF in sinus rhythm and without prostatic disease. Patients were randomized into two groups. A group (T, n = 30) underwent supervised cycle ergometer ET at 60% of peak VO2, three times a week, 60 min each session, for 8 weeks. A group (NT, n = 29) was not exercised. Medications were not changed during the study. On study entry and at 8 weeks all patients underwent a symptom-limited cardiopulmonary exercise testing, brachial artery endothelium-dependent (ED) and endothelium-independent (EI) vasomotor responses, QOL and sexual activity profile assessment (SAP) by questionnaire. RESULTS At 8 weeks, no changes were observed in control patients. In trained patients, however, peak VO2 improved by 18% (P < 0.005) and was correlated with QOL (r = 0.80; P < 0.001). Flow-mediated dilation improved in trained patients (from 2.29+/-1.13% to 5.04+/-1.7%, P = 0.0001), while EI dilation (after 0.3 mg sublingual NTG) did not. In group T, all three domains (i.e. Domain 1=relationship with the partner; Domain 2 = quality of penile erection; Domain 3 = personal wellness) were significantly improved from baseline (total score patients: from 3.49+/-3.4 to 6.17+/-3.2, P < 0.001; partners: from 2.47+/-2.7 to 4.87+/-2.5, P < 0.001). Pre-post training change in SAP total score was correlated with changes in coronary risk profile (r = -0.49; P = 0.01), peak VO2 (r = 0.67; P < 0.001) and QOL (r = 0.73; P = 0.01). Multivariate analysis selected the improvement in ED-vasomotor response as the strongest independent predictor of SAP improvement (r = 0.63, P < 0.001). CONCLUSIONS In stable CHF, cycle ergometer ET significantly improves brachial artery endothelial dysfunction, suggesting a systemic effect of leg exercise. This benefit was correlated with improvements in sexual activity.
Collapse
|
31
|
Abstract
Erectile dysfunction (ED) and vascular disease are thought to be linked at the level of the endothelium. Endothelial dysfunction, resulting in the inability of the smooth muscle cells lining the arterioles to relax, prevents vasodilatation. Likewise, penile erection depends on the relaxation of smooth muscle in the corpus cavernosum and the wall of small arteries. The aim was to assess the systemic vascular function in patients with ED. In all, 32 ED patients diagnosed with Doppler Ultrasound and the International Index of Erectile Function-5-item questionnaire and 25 healthy men as a control group enrolled to the study. They all underwent the tests including serum glucose and lipid levels. Echocardiography and exercise stress test was performed routinely. Baseline demographics (body mass index, heart rate and blood pressures), fasting glucose and lipid levels were not significantly different between ED and control groups. Endothelial-dependent brachial artery flow-mediated vasodilatation and brachial artery response to 0.4 mg nitroglycerine (NTG) were measured. Participants were negative on exercise stress test, and echocardiographic parameters including ejection fraction were similar. Endothelial-dependent brachial artery percent diameter change with flow-mediated dilatation (6.01+/-2.9 vs 12.3+/-3.5) and brachial artery response to NTG (12.8+/-4.2 vs 17.8+/-5.2) were significantly different between groups (P<0.001). We found that endothelial function was impaired in ED patients with no apparent cardiovascular disease and diabetes mellitus. This impaired function might be explained by the abnormality in systemic nitric oxide-cyclic guanosine monophosphate vasodilator system and suggest that ED and vascular disease may be linked at the level of the endothelium.
Collapse
Affiliation(s)
- C Kaya
- Department of Urology, Haydarpasa Numune Training and Research Hospital, Bulgurlu mah. Uygarkent sit, Uskudar, Istanbul, Turkey.
| | | | | |
Collapse
|
32
|
Barutcu I, Sezgin AT, Sezgin N, Gullu H, Esen AM, Topal E, Ozdemir R. Elevated plasma homocysteine level in slow coronary flow. Int J Cardiol 2005; 101:143-5. [PMID: 15860399 DOI: 10.1016/j.ijcard.2004.01.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Accepted: 01/07/2004] [Indexed: 11/23/2022]
Abstract
BACKGROUND Slow flow velocity of dye in coronary arteries is not an infrequent finding during routine coronary angiography and its precise mechanism is unknown. In this study, we measured the plasma homocysteine level in patients with slow coronary flow (SCF) in comparison with subjects having normal coronary flow (NCF). METHOD The study consisted 39 patients (mean age, 47+/-8 years) with angiographically diagnosed SCF. SCF was defined according to TIMI frame count (TFC) method. Thirty subjects (mean age 46+/-8 years) with NCF served as control group. Plasma homocysteine levels were measured after 12 h fasting period in each subject. RESULTS Baseline demographic properties were similar in both groups. In patients with SCF, TFC was significantly higher than those with NCF. Similarly, in patients with SCF plasma homocysteine level was significantly higher than that of control group (14.1+/-2.2 vs. 5.5+/-1.3 micromol/l, respectively p < 0.001). CONCLUSION Elevated plasma homocysteine level supports the hypothesis that endothelial function is impaired in slow coronary flow.
Collapse
|
33
|
Affiliation(s)
- Ossama A Hatoum
- Division of Cardiovascular Medicine, Department of Medicine, Cardiovascular Research Center, Froedtert Memorial Lutheran Hospital, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA
| | | |
Collapse
|
34
|
Bae JH, Bassenge E, Kim MH, Park KR, Kim KY, Synn YC, Schwemmer M. Impact of left ventricular ejection fraction on endothelial function in patients with coronary artery disease. Clin Cardiol 2004; 27:333-7. [PMID: 15237691 PMCID: PMC6654397 DOI: 10.1002/clc.4960270606] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Endothelial dysfunction is present in patients with coronary artery disease (CAD) or with congestive heart failure. HYPOTHESIS This study was performed to evaluate the impact of systolic heart function on endothelial function in patients with CAD. METHODS The study population consisted of 283 consecutive patients (mean age 59 years, 176 men) undergoing coronary angiography. Endothelial function was assessed by measuring flow-mediated vasodilation (FMD) of the brachial artery. RESULTS Patients (n = 236) with an ejection fraction (EF) > or = 55% on routine echocardiogram were younger (mean age 58 vs. 62 years), showed a lower prevalence of diabetes (15 vs. 38%) and myocardial infarction (13 vs. 66%), and showed a higher FMD (4.8 +/- 2.4 vs. 4.0 +/- 2.0%, p < 0.05) than patients (n = 47) with an EF < 55%. The correlation coefficient between FMD/endothelial function and EF/systolic heart function was 0.149 (p < 0.02) in the overall study population. Multivariate analysis showed that of age, gender, frequency of diabetes mellitus, myocardial infarction, and CAD extent, EF was the only significant independent parameter correlating with FMD in patients with CAD. CONCLUSIONS Compared with the other tested risk factors, EF surprisingly was the only significant independent parameter correlating with endothelial function in patients with CAD. Our results support the view that endothelial function is an independent prognostic factor in patients with CAD.
Collapse
Affiliation(s)
- Jang-Ho Bae
- Division of Cardiology, College of Medicine, Konyang University Hospital, Daejeon, South Korea.
| | | | | | | | | | | | | |
Collapse
|
35
|
Abstract
Growth factors are members of a large functional group of polypeptide regulatory molecules that influence the biological activities of responsive cells. In the last decade, the use of a variety of growth factors as therapeutic agents to improve wound healing and the viability of ischemic skin flaps has aroused considerable interest. Here, we review the literature concerning the regulation of growth factors in a flap, the role of angiogenesis in flap survival, the effect of growth factors on the metabolism of a flap, and angiogenesis in flap prefabrication and maturation. The potential application of growth factors in gene therapies is also reviewed.
Collapse
Affiliation(s)
- Feng Zhang
- Division of Plastic Surgery, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | | | | |
Collapse
|
36
|
Shimabukuro M, Higa N, Takasu N, Tagawa T, Ueda S. A single dose of nateglinide improves post-challenge glucose metabolism and endothelial dysfunction in Type 2 diabetic patients. Diabet Med 2004; 21:983-6. [PMID: 15317602 DOI: 10.1111/j.1464-5491.2004.01272.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS This randomized crossover placebo-controlled study aimed to assess the efficacy of nateglinide, a phenylalanine-derived insulin secretagogue, on forearm endothelial function in diabetic subjects before and after an oral glucose load. METHODS Forearm blood flow (FBF) was measured using strain-gauge plethysmography during reactive hyperaemia before and after an oral glucose load (75 g) with a prior use of placebo or nateglinide (90 mg) in 15 diet-treated Type 2 diabetic patients or age-matched controls with normal glucose tolerance. RESULTS The peak FBF response and total reactive hyperaemic flow (flow debt repayment: FDR), indices of resistance artery endothelial function, were decreased after an oral glucose load in diabetic patients, but unchanged in controls. Nateglinide administered to diabetic patients accelerated insulin secretion and reduced post-challenge plasma glucose, and also abolished the post-challenge impairment of endothelial function. The peak FBF and FDR were well correlated with 120-min glucose levels and 30-min insulinogenic index. CONCLUSIONS A single challenge of glucose was shown to impair endothelial function in diabetic patients, and the post-challenge endothelial dysfunction was improved by a prior use of nateglinide. Long-term effects of nateglinide on endothelial function in Type 2 diabetic patients need to be clarified in future studies.
Collapse
Affiliation(s)
- M Shimabukuro
- Second Department of Internal Medicine, Faculty of Medicine, University of Ryukus, Okinawa, Japan.
| | | | | | | | | |
Collapse
|
37
|
Göthert JR, Gustin SE, van Eekelen JAM, Schmidt U, Hall MA, Jane SM, Green AR, Göttgens B, Izon DJ, Begley CG. Genetically tagging endothelial cells in vivo: bone marrow-derived cells do not contribute to tumor endothelium. Blood 2004; 104:1769-77. [PMID: 15187022 DOI: 10.1182/blood-2003-11-3952] [Citation(s) in RCA: 218] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Tumor growth is dependent in part on "neoangiogenesis." Functional involvement of bone marrow (BM)-derived cells in this process has been demonstrated. However, it remains controversial as to whether tumor endothelium itself is BM derived. Here we sought to address this issue with an endothelial-specific, inducible transgenic model. We generated Cretransgenic mice (endothelial-SCL-Cre-ER(T)) using the tamoxifen-inducible Cre-ER(T) recombinase driven by the 5' endothelial enhancer of the stem cell leukemia (SCL) locus. These mice were intercrossed with Cre reporter strains in which beta-galactosidase (LacZ) or enhanced yellow fluorescent protein (EYFP) are expressed upon Cre-mediated recombination. After tamoxifen administration, endothelial LacZ staining was observed in embryonic and adult tissues. Cre-mediated recombination was also observed in newly generated tumor endothelium. In adult BM cells we could only detect trace amounts of recombination by flow cytometry. Subsequently, BM from endothelial-SCL-Cre-ER(T);R26R mice was transplanted into irradiated recipients. When tumors were grown in recipient mice, which received tamoxifen, no tumor LacZ staining was detected. However, when tumors were grown in endothelial-SCL-Cre-ER(T);R26R mice 3 weeks after the cessation of tamoxifen treatment, there was widespread endothelial LacZ staining present. Thus, this genetic model strongly suggests that BM cells do not contribute to tumor endothelium and demonstrates the lineage relation between pre-existing endothelium and newly generated tumor endothelial cells.
Collapse
Affiliation(s)
- Joachim R Göthert
- Division of Cancer Biology, Telethon Institute for Child Health Research, Centre for Child Health Research and Western Australian Institute for Medical Research, University of Western Australia, West Perth, Australia.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Abstract
Mast cells have been implicated as the central effectors in allergic responses, yet a fatal anaphylactic response can be induced in mast cell-deficient mice. In this study, we examined the immediate hypersensitivity response in wild-type (WT) and mast cell-deficient mice (W/W(v)) in two different tissues (skin and skeletal muscle). Vascular permeability and leukocyte recruitment were studied after immediate challenge or 4 h postchallenge in OVA-sensitized mice. In skin, immediate challenge induced a significant increase in vascular permeability (75%) within 30 min and was accompanied by increased leukocyte adhesion 4 h postchallenge. In the absence of mast cells, no changes in vascular permeability or leukocyte recruitment were observed in skin. In WT skeletal muscle, immediate challenge induced a rapid increase (80%) in vascular permeability within 5 min and significant leukocyte recruitment after 4 h. Surprisingly, in W/W(v), a gradual increase in vascular permeability was observed, reaching a maximum (50%) within 30 min. Despite the absence of mast cells, subsequent leukocyte emigration was similar to that observed in WT mice. Pretreatment with anti-platelet serum in W/W(v) returned Ag-induced vascular permeability and leukocyte recruitment to baseline. Platelets were shown to interact with endothelium in skeletal muscle, but not dermal microvasculature. These data illustrate that mast cells play a prominent role in vascular permeability and leukocyte recruitment in skin in response to Ag, however, in skeletal muscle; these changes can occur in the absence of mast cells, and are mediated, in part, by the presence of platelets.
Collapse
MESH Headings
- Allergens/administration & dosage
- Animals
- Blood Platelets/immunology
- Capillary Permeability/genetics
- Capillary Permeability/immunology
- Cell Adhesion/genetics
- Cell Adhesion/immunology
- Cell Communication/genetics
- Cell Communication/immunology
- Cell Movement/genetics
- Cell Movement/immunology
- Endothelium/blood supply
- Endothelium/cytology
- Endothelium/immunology
- Hypersensitivity, Immediate/immunology
- Hypersensitivity, Immediate/pathology
- Hypersensitivity, Immediate/physiopathology
- Injections, Intraperitoneal
- Leukocytes/cytology
- Leukocytes/immunology
- Male
- Mast Cells/immunology
- Mast Cells/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Mutant Strains
- Muscle, Skeletal/blood supply
- Muscle, Skeletal/immunology
- Muscle, Skeletal/pathology
- Ovalbumin/administration & dosage
- Ovalbumin/immunology
- Rats
- Rats, Sprague-Dawley
- Skin/blood supply
- Skin/cytology
- Skin/immunology
Collapse
Affiliation(s)
- Denise C Cara
- Gastrointestinal Research Group, Department of Physiology and Biophysics, University of Calgary, Calgary, Alberta, Canada
| | | | | |
Collapse
|
39
|
Liang OD, Korff T, Eckhardt J, Rifaat J, Baal N, Herr F, Preissner KT, Zygmunt M. Oncodevelopmental alpha-fetoprotein acts as a selective proangiogenic factor on endothelial cell from the fetomaternal unit. J Clin Endocrinol Metab 2004; 89:1415-22. [PMID: 15001643 DOI: 10.1210/jc.2003-031721] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The molecular coordination between angiogenesis and vascular remodeling is a critical step for the development of a functional vasculature in the placenta and the uterus during pregnancy. The oncodevelopmental albumin homolog alpha-fetoprotein (AFP) is mainly synthesized in the developing fetus, and its expression has been found to be associated with highly vascularized tumors in the adult. In this study, we investigated the angiogenic activity of AFP and its possible role in the fetomaternal unit. Immunohistochemical studies revealed that the AFP-binding protein(s) is expressed in blood vessels of chorionic villi from placentae of the second and the third but not of the first trimester during pregnancy. At low concentrations, AFP directly stimulates or enhances, respectively, vascular endothelial growth factor-induced proliferation and sprout formation of endothelial cells isolated from the placenta and the uterus possibly by a MAPK-dependent pathway. Furthermore, AFP enhances blood vessel formation in a chick chorioallantoic membrane assay in vivo. Interestingly, AFP has no proliferative or migratory effects on endothelial cells isolated from the umbilical vein in the absence of vascular endothelial growth factor. These data indicate that AFP may act as a specific proangiogenic factor of endothelial cells within the fetomaternal unit during advanced stages in pregnancy.
Collapse
Affiliation(s)
- Olin D Liang
- Department of Obstetrics and Gynecology, Justus-Liebig-University, D-35385 Giessen, Germany
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
OBJECTIVE This study investigated the effect of Warm-Up therapy on the proliferation of human microvascular dermal endothelial cells. METHOD Endothelial cells from an adult subject were seeded in six-well plates and placed in an incubator at 32.5 degrees C. The following day Warm-Up dressings were placed over the plates, with or without warming cards. Cards set at 38 degrees C or 42 degrees C raised the temperature in the medium to maxima of 34.5 degrees C and 37.5 degrees C respectively. Units were switched on daily for three one-hour periods. Cell numbers were counted by haemocytometer. RESULTS Maximum stimulation of endothelial cell proliferation occurred under the 38 degrees C card, with cells numbering 135-158% of the controls (p < 0.05). the 42 degrees C card also stimulated cells (110-155%) but this did not reach statistical significance. CONCLUSION The accelerated proliferation of microvascular dermal endothelial cells achieved by intermittent radiant warming may have contributed to the increase in granulation tissue reported previously in our clinic.
Collapse
Affiliation(s)
- M A Hughes
- Oxford Wound Healing Institute, The Churchill Hospital, Oxford, UK.
| | | | | |
Collapse
|
41
|
Cornelini R, Rubini C, Fioroni M, Favero GA, Strocchi R, Piattelli A. Transforming growth factor-beta 1 expression in the peri-implant soft tissues of healthy and failing dental implants. J Periodontol 2003; 74:446-50. [PMID: 12747448 DOI: 10.1902/jop.2003.74.4.446] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Transforming growth factor-beta (TGF-beta) is composed of a family of multifunctional polypeptide growth factors involved in embryogenesis, inflammation, regulation of immune response, angiogenesis, wound healing, and extracellular matrix formation. TGF-beta1 is the most common isoform found in human tissues. A role of TGF-beta in the pathogenesis of periodontal disease has been suggested. The aim of the present study was a comparative immunohistochemical evaluation of TGF-beta1 in normal keratinized gingiva and in the peri-implant soft tissues surrounding failing non-submerged implants. METHODS Twenty patients participated in this study. Ten biopsies from healthy keratinized mucosa and 10 biopsies from peri-implant soft tissues surrounding failing implants were obtained (one biopsy per patient). The biopsies were obtained from different patients. RESULTS In 5 cases of healthy mucosa, the stromal cells were positive between 1 to 5. In 7 cases, the epithelial layers were positive, between 1 and 18 cells. The superficial epithelial layer was negative in all cases. In 9 cases, there was a positivity of the vascular component, between 2 and 16 vessels. In failing implants, the stromal cells were positive in 6 cases, between 1 and 4. In all cases, cells of the epithelial layers were positive, between 15 and 40. The vascular component was positive in all cases, between 12 and 30 vessels. The differences between TGF-beta1 expression in the epithelium around healthy and failing implants were statistically significant (P < 0.0001). The differences between TGF-beta1 expression in the blood vessels in the soft tissues around healthy and failing implants were also statistically significant (P < 0.0001). No statistically significant difference was observed between the 2 groups in the TGF-beta1 expression in the stromal cells (P = 0.88). CONCLUSION TGF-beta1 may be one of the most important factors in the regulation of the infiltrate, and in the production of tissue repair with a stimulation of fibroblasts and endothelial cells.
Collapse
|
42
|
Lind L, Sarabi M, Millgård J. The effect of smoking on endothelial vasodilatory function evaluated by local infusion of metacholine in the forearm is dependent on the duration of smoking. Nicotine Tob Res 2003; 5:125-30. [PMID: 12745514 DOI: 10.1080/1462220031000070516] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The objective of the study was to evaluate if endothelial vasodilatory function in the human forearm is impaired by regular cigarette smoking. The setting was a tertiary university hospital. Subjects were 56 apparently healthy subjects from a population screening (mean age 50) and 52 young healthy volunteers (mean age 25) who were investigated regarding endothelial-dependent (EDV) and endothelial-independent vasodilation (EIDV) by means of local infusion of metacholine (MCh; 2 and 4 mg/min) and sodium nitroprusside (SNP; 5 and 10 mg/min) in the forearm. Forearm blood flow (FBF) was measured by venous occlusion plethysmography. The MCh to SNP FBF ratio was denoted the endothelial function index. In the young subjects, no differences between smokers (n = 12) and non-smokers regarding EDV or EIDV were seen. In the population sample, however, the smokers (n = 8) showed an attenuated endothelial function index when compared with non-smokers (1.0 +/- 0.1 vs. 1.3 +/- 0.3, p = .02). The EDV showed a significant inverse relationship to the duration of smoking (r = -0.52, p < .05), independent of age, when the smokers in both groups were analyzed together. A similar, although not significant, relation was found between the endothelial function index and the duration of smoking (p = -.44). The present study showed that endothelial vasodilatory function was impaired in middle-aged, but not young, smokers, suggesting that the duration of smoking is of major importance for the deleterious effects of smoking on endothelial vasodilatory function.
Collapse
Affiliation(s)
- Lars Lind
- Department of Internal Medicine, University Hospital, Uppsala, Sweden.
| | | | | |
Collapse
|
43
|
Abstract
OBJECTIVES The purpose of the present study was to examine human pituitary adenomas for nitric oxide synthase (NOS) activity by immunohistochemical and enzymatic methods. MATERIALS AND METHODS Adenomatous tissue from 16 patients were obtained during operation and stained immunohistochemically for hormone production and for the three NOS isoenzymes. Cell types that expressed NOS immunoreactivity (IR) were identified, and the NOS isoform was noted. NOS activity was measured enzymatically by the conversion of L-arginine to L-citrulline in tissue samples. RESULTS Endothelial cells of pituitary adenomas showed increase of eNOS IR compared with control tissue. The nNOS and iNOS IR were the same in adenomas and controls. There was no correlation between NOS IR and NOS activity measured enzymatically and the endocrine activity of the tumour or other clinical variables. CONCLUSION The observation of increased eNOS IR in endothelial cells of adenomas may suggest that NO plays a role in the regulation of blood flow in pituitary adenomas.
Collapse
Affiliation(s)
- A Kruse
- Department of Neurosurgery, Glostrup University Hospital, Glostrup, Denmark.
| | | | | | | | | |
Collapse
|
44
|
Roman CD, Choy H, Nanney L, Riordan C, Parman K, Johnson D, Beauchamp RD. Vascular endothelial growth factor-mediated angiogenesis inhibition and postoperative wound healing in rats. J Surg Res 2002; 105:43-7. [PMID: 12069500 DOI: 10.1006/jsre.2002.6444] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Vascular endothelial growth factor (VEGF) is an angiogenic factor that acts by binding to specific high-affinity tyrosine kinase receptors. SU5416 is an antiangiogenic agent that acts as a potent and selective inhibitor of the VEGF Flk-1/KDR receptor tyrosine kinase. SU5416 has been shown to inhibit VEGF-dependent mitogenesis of human endothelial cells and to decrease the growth of xenografts of melanoma, lung carcinoma, ovarian carcinoma, and gliomas. The effect of pre- or perioperative use of this drug on angiogenesis and wound healing in the postoperative setting has not been shown. We sought to analyze the efficacy and safety with respect to functional dosing of SU5416 in the setting of wound healing. This represents an important step forward in the use of this and similar drugs in the perioperative setting of treatment for multiple types of cancers. The use of an inhibitor of VEGF receptors such as SU5416 is distinct and it is likely complementary to other agents in the treatment of such cancers. METHODS We injected 8-week-old male Sprague-Dawley rats with SU5416 (8 or 12 mg/kg) or dimethyl sulfoxide intraperitoneally, daily for 14 days. We then performed a right pulmonary lobectomy and 6-mm full-thickness punch biopsies of the back. Tissue perfusion measured via laser Doppler on Postoperative Day 2 was 1.65, 1.22, and 1.14 perfusion units (P < 0.0004) for control, 8 mg/kg, and 12 mg/kg groups, respectively. RESULTS We successfully treated a murine model with functional doses of the anti-VEGF drug SU5416 so as to achieve decreased vascularity and blood flow in postoperative wounds. There was no effect on gross wound healing or infection in either control or treatment groups. Also, no drug-related impairment of histologic healing or decrease in wound tensile strength was demonstrated at either 6 or 14 days. CONCLUSION Preoperative therapy with functional dosing of SU5416 does not appear to have any major effect on postoperative morbidity or mortality in rats. We additionally conclude that preoperative therapy with SU5416 should be investigated further with careful attention to wound integrity.
Collapse
Affiliation(s)
- Christopher D Roman
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
| | | | | | | | | | | | | |
Collapse
|
45
|
Solaun MS, Mendoza L, De Luca M, Gutierrez V, López MP, Olaso E, Lee Sim BK, Vidal-Vanaclocha F. Endostatin inhibits murine colon carcinoma sinusoidal-type metastases by preferential targeting of hepatic sinusoidal endothelium. Hepatology 2002; 35:1104-16. [PMID: 11981760 DOI: 10.1053/jhep.2002.32528] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
An angiogenic response originating from peritumoral sinusoids and portal tracts that leads to the formation of metastases with sinusoidal- and portal-type angiogenic patterns, respectively, occurs during the course of liver colonization by murine 51b colon carcinoma (51b-CC) cells. We found a 5-fold increase in endogenous endostatin levels from hepatic blood over baseline (25 +/- 6 ng/mL) when micrometastatic foci had a detectable size and a 14-fold increase when macrometastases were developed. Despite this endogenous endostatin production, subcutaneous administration of recombinant human endostatin (rh-E; 50 mg/kg) decreased metastasis number by 60% when dosed from days 1 to 20 after 51b-CC cell injection, by 40% when given from days 10 to 20, and by 30% when administered as a single dose 30 minutes before 51b-CC cell injection compared with controls. In addition, administration of rh-E from days 10 to 20 decreased overall metastasis volume by 90% compared with controls. rh-E increased the number of necrotic sinusoidal-type metastases by 7-fold and decreased their intrametastatic CD31(+)-microvessel density by 80% without affecting portal-type metastases. Flow cytometry showed rh-E binding to mouse liver sinusoidal cells but not to CD45(+) cells (leukocytes and Kupffer cells) or 51b-CC cells. Furthermore, rh-E induced sinusoidal endothelium cell apoptosis. In conclusion, despite the direct correlation between metastasis development and endogenous endostatin generation in the liver, administration of rh-E inhibited micrometastasis generation and macrometastasis growth very efficiently. The antiangiogenic mechanism was selective for sinusoidal-type metastases, in which the neovasculature originating from sinusoidal endothelium cells was targeted by rh-E.
Collapse
Affiliation(s)
- Miren S Solaun
- Biomedical Research and Technological Development Institute, INBIOMED Foundation, San Sebastian Technological Park, Gipuzkoa, Spain
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Kirkpatrick CJ, Barth S, Gerdes T, Krump-Konvalinkova V, Peters K. [Pathomechanisms of impaired wound healing by metallic corrosion products]. Mund Kiefer Gesichtschir 2002; 6:183-90. [PMID: 12143131 DOI: 10.1007/s10006-002-0371-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Metallic materials of variable chemical composition have been used in dental practice for a long time. Complications with respect to tissue healing after insertion of implants are well documented. In this paper we present relevant aspects of the related fields of inflammation and repair processes and focus on the pathomechanisms of this impaired healing response. MODULATION OF WOUND HEALING This latter process is modulated by specific metal ions released by corrosion activity as well as by wear particles, which influence the function of the participating cell types (e.g. endothelial cells). IN VITRO MODELS In this context, in vitro models are presented that permit study of isolated aspects of the complex sequence of events at the biomaterial-tissue interface. Furthermore, newly developed, computer-assisted methods allowing an objective quantification of biomaterial/corrosion product-induced effects on complex processes, such as angiogenesis in vitro, are demonstrated. Because of the central importance of titanium implants in maxillofacial surgery, new experimental approaches to study possible negative effects are presented. Finally, the relevance of such studies for clinical implantology is evaluated.
Collapse
Affiliation(s)
- C J Kirkpatrick
- Institut für Pathologie, Klinikum, Johannes-Gutenberg-Universität, Langenbeckstrasse 1, 55101 Mainz.
| | | | | | | | | |
Collapse
|
47
|
Motoyama T, Kawano H, Hirai N, Tsunoda R, Moriyama Y, Miyao Y, Sakamoto T, Yoshimura M, Kugiyama K, Yasue H, Ogawa H. The relationship of left ventricular mass to endothelium-dependent vasodilation of the brachial artery in patients with hypertension. Cardiology 2002; 96:7-15. [PMID: 11701935 DOI: 10.1159/000047380] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Although echocardiographically determined left ventricular mass and geometry predict cardiovascular morbid events in patients with hypertension, the mechanisms underlying this relation are unclear. There is considerable evidence that endothelium-dependent vasodilation is impaired in patients with hypertension. Thus, endothelial dysfunction may contribute to the mechanism that causes cardiovascular morbid events. This study was designed to examine the relationship between left ventricular geometry and endothelial function in patients with hypertension. The percentage increase in brachial arterial diameter during reactive hyperemia was examined by a high-resolution ultrasound technique in 49 patients with hypertension and 64 normotensive subjects. Patients with hypertension had an impairment of the percentage increase in brachial arterial diameter during reactive hyperemia and an increase in thiobarbituric acid-reactive substances (TBARS) compared to normotensive subjects (percentage increase in diameter 5.6 +/- 3.0 vs. 8.0 +/- 2.5%, p < 0.001; TBARS levels 6.1 +/- 1.3 vs. 5.3 +/- 1.0 nmol/ml, p < 0.001). In patients with hypertension, there was a significant correlation between the left ventricular mass index and the percentage increase in brachial arterial diameter during reactive hyperemia (r = -0.583, p < 0.001), and the percentage increase in brachial arterial diameter during reactive hyperemia varied with the pattern of left ventricular geometry (normal ventricular geometry: 7.7 +/- 2.6%; concentric remodeling: 5.2 +/- 2.3%; eccentric hypertrophy: 4.2 +/- 1.8%; concentric hypertrophy: 2.9 +/- 2.6%). We conclude that (1) flow-mediated endothelium-dependent vasodilation in the brachial artery is impaired in patients with hypertension, (2) a relationship exists between the left ventricular mass index and flow-mediated endothelium-dependent vasodilation in the brachial artery in patients with hypertension and (3) increased oxidative stress may play a role in the endothelial dysfunction in patients with hypertension.
Collapse
Affiliation(s)
- T Motoyama
- Department of Cardiovascular Medicine, Kumamoto University School of Medicine, Kumamoto City, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Mazzoni MC, Tsai AG, Intaglietta M. Blood and plasma viscosity and microvascular function in hemodilution. A perspective from La Jolla, California. Eur Surg Res 2002; 34:101-5. [PMID: 11867909 DOI: 10.1159/000048895] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
49
|
Barbosa T, Arruda S, Cavada B, Grangeiro TB, de Freitas LA, Barral-Netto M. In vivo lymphocyte activation and apoptosis by lectins of the Diocleinae subtribe. Mem Inst Oswaldo Cruz 2001; 96:673-8. [PMID: 11500769 DOI: 10.1590/s0074-02762001000500016] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper reports the overall effects of three lectins, extracted from Canavalia brasiliensis, Dioclea violacea, and D. grandiflora, on BALB/c mice popliteal draining lymph nodes. These lectins have presented high stimulatory capacity on lymph node T cells. Additionally, they were able to induce apoptosis and inflammation (frequently associated with high endothelial venule necrosis). The data presented here suggest that the Diocleinae lectins studied can stimulate in vivo T cell activation and apoptosis, as well as present important side effects.
Collapse
Affiliation(s)
- T Barbosa
- Centro de Pesquisas Gonçalo Moniz-Fiocruz, 40295-001 Salvador, BA, Brasil
| | | | | | | | | | | |
Collapse
|
50
|
Figueroa XF, Martínez AD, González DR, Jara PI, Ayala S, Boric MP. In vivo assessment of microvascular nitric oxide production and its relation with blood flow. Am J Physiol Heart Circ Physiol 2001; 280:H1222-31. [PMID: 11179067 DOI: 10.1152/ajpheart.2001.280.3.h1222] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To assess the hypothesis that microvascular nitric oxide (NO) is critical to maintain blood flow and solute exchange, we quantified NO production in the hamster cheek pouch in vivo, correlating it with vascular dynamics. Hamsters (100-120 g) were anesthetized and prepared for measurement of microvessel diameters by intravital microscopy, of plasma flow by isotopic sodium clearance, and of NO production by chemiluminescence. Analysis of endothelial NO synthase (eNOS) location by immunocytochemistry and subcellular fractionation revealed that eNOS was present in arterioles and venules and was 67 +/- 7% membrane bound. Basal NO release was 60.1 +/- 5.1 pM/min (n = 35), and plasma flow was 2.95 +/- 0.27 microl/min (n = 29). Local NO synthase inhibition with 30 microM N(omega)-nitro-L-arginine reduced NO production to 8.6 +/- 2.6 pmol/min (-83 +/- 5%, n = 9) and plasma flow to 1.95 +/- 0.15 microl/min (-28 +/- 12%, n = 17) within 30-45 min, in parallel with constriction of arterioles (9-14%) and venules (19-25%). The effects of N(omega)-nitro-L-arginine (10-30 microM) were proportional to basal microvascular conductance (r = 0.7, P < 0.05) and fully prevented by 1 mM L-arginine. We conclude that in this tissue, NO production contributes to 35-50% of resting microvascular conductance and plasma-tissue exchange.
Collapse
Affiliation(s)
- X F Figueroa
- Unidad de Regulación Neurohumoral, Departamento de Ciencias Fisiológicas, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile 6513492
| | | | | | | | | | | |
Collapse
|