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Yoon HJ, Moon HW, Min YS, Jin F, Bang JS, Sohn UD, Je HD. Effect of Kaempferol on Modulation of Vascular Contractility Mainly through PKC and CPI-17 Inactivation. Biomol Ther (Seoul) 2024; 32:361-367. [PMID: 38589300 PMCID: PMC11063477 DOI: 10.4062/biomolther.2023.186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/20/2023] [Accepted: 11/28/2023] [Indexed: 04/10/2024] Open
Abstract
In this study, we investigated the efficacy of kaempferol (a flavonoid found in plants and plant-derived foods such as kale, beans, tea, spinach and broccoli) on vascular contractibility and aimed to clarify the detailed mechanism underlying the relaxation. Isometric contractions of divested muscles were stored and linked with western blot analysis which was carried out to estimate the phosphorylation of myosin phosphatase targeting subunit 1 (MYPT1) and phosphorylation-dependent inhibitory protein for myosin phosphatase (CPI-17) and to estimate the effect of kaempferol on the RhoA/ROCK/CPI-17 pathway. Kaempferol conspicuously impeded phorbol ester-, fluoride- and a thromboxane mimetic-derived contractions regardless of endothelial nitric oxide synthesis, indicating its direct effect on smooth muscles. It also conspicuously impeded the fluoride-derived elevation in phospho-MYPT1 rather than phospho-CPI-17 levels and phorbol 12,13-dibutyrate-derived increase in phospho-CPI-17 and phospho-ERK1/2 levels, suggesting the depression of PKC and MEK activities and subsequent phosphorylation of CPI-17 and ERK1/2. Taken together, these outcomes suggest that kaempferol-derived relaxation incorporates myosin phosphatase retrieval and calcium desensitization, which appear to be modulated by CPI-17 dephosphorylation mainly through PKC inactivation.
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Affiliation(s)
- Hyuk-Jun Yoon
- Department of Pharmacy, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Heui Woong Moon
- Department of Pharmacy, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Young Sil Min
- Department of Pharmaceutical Science, Jungwon University, Goesan 28024, Republic of Korea
| | - Fanxue Jin
- School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea
| | - Joon Seok Bang
- College of Pharmacy, Sookmyung Women’s University, Seoul 04310, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyun Dong Je
- Department of Pharmacy, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
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Yoon HJ, Kang DH, Jin F, Bang JS, Sohn UD, Je HD. The Effect of Luteolin on the Modulation of Vascular Contractility via ROCK and CPI-17 Inactivation. Biomol Ther (Seoul) 2023; 31:193-199. [PMID: 36065763 PMCID: PMC9970840 DOI: 10.4062/biomolther.2022.087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/17/2022] [Accepted: 08/18/2022] [Indexed: 11/05/2022] Open
Abstract
In this investigation, we made a study of the efficacy of luteolin (a flavonoid found in plants such as vegetables, herbs and fruits) on vascular contractibility and to elucidate the mechanism underlying the relaxation. Isometric contractions of denuded muscles were stored and combined with western blot analysis which was conducted to assess the phosphorylation of myosin phosphatase targeting subunit 1 (MYPT1) and phosphorylation-dependent inhibitory protein for myosin phosphatase (CPI-17) and to examine the effect of luteolin on the RhoA/ROCK/CPI-17 pathway. Luteolin significantly alleviated phorbol ester-, fluoride- and thromboxane mimetic-elicited contractions regardless of endothelial nitric oxide synthesis, implying its direct effect on smooth muscle. It also significantly alleviated the fluoride-elicited elevation in pCPI-17 and pMYPT1 levels and phorbol 12,13-dibutyrate-elicited increase in pERK1/2 level, suggesting depression of ROCK and PKC/MEK activity and ensuing phosphorylation of MYPT1, CPI-17 and ERK1/2. Taken together, these results suggest that luteolin-elicited relaxation includes myosin phosphatase reactivation and calcium desensitization, which seems to be arbitrated by CPI-17 dephosphorylation via ROCK/PKC inhibition.
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Affiliation(s)
- Hyuk-Jun Yoon
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Dae Hong Kang
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Fanxue Jin
- Department of Pharmacology, Kyungpook National University School of Medicine, Daegu 41944, Republic of Korea
| | - Joon Seok Bang
- College of Pharmacy, Sookmyung Women’s University, Seoul 04310, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea,Corresponding Author E-mail: , Tel: +82-53-850-3615, Fax: +82-53-359-6734
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Malacarne PF, Bezzenberger J, Lopez M, Warwick T, Müller N, Brandes RP, Rezende F. Epoxyeicosatrienoic Acid and Prostanoid Crosstalk at the Receptor and Intracellular Signaling Levels to Maintain Vascular Tone. Int J Mol Sci 2022; 23:ijms23115939. [PMID: 35682616 PMCID: PMC9180422 DOI: 10.3390/ijms23115939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/18/2022] [Accepted: 05/23/2022] [Indexed: 11/16/2022] Open
Abstract
Epoxyeicosatrienoic acids (EETs) are signaling lipids produced by the cytochrome P450-(CYP450)-mediated epoxygenation of arachidonic acid. EETs have numerous biological effects on the vascular system, but aspects including their species specificity make their effects on vascular tone controversial. CYP450 enzymes require the 450-reductase (POR) for their activity. We set out to determine the contribution of endothelial CYP450 to murine vascular function using isolated aortic ring preparations from tamoxifen-inducible endothelial cell-specific POR knockout mice (ecPOR-/-). Constrictor responses to phenylephrine were similar between control (CTR) and ecPOR-/- mice. Contrastingly, sensitivity to the thromboxane receptor agonist U46619 and prostaglandin E2 (PGE2) was increased following the deletion of POR. Ex vivo incubation with a non-hydrolyzable EET (14,15-EE-8(Z)-E, EEZE) reversed the increased sensitivity to U46619 to the levels of CTR. EETs had no effect on vascular tone in phenylephrine-preconstricted vessels, but dilated vessels contracted with U46619 or PGE2. As U46619 acts through RhoA-dependent kinase, this system was analyzed. The deletion of POR affected the expression of genes in this pathway and the inhibition of Rho-GTPase with SAR407899 decreased sensitivity to U46619. These data suggest that EET and prostanoid crosstalk at the receptor level and that lack of EET production sensitizes vessels to vasoconstriction via the induction of the Rho kinase system.
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Affiliation(s)
- Pedro Felipe Malacarne
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Justus Bezzenberger
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Melina Lopez
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Timothy Warwick
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Niklas Müller
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Ralf P. Brandes
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
| | - Flávia Rezende
- Institute for Cardiovascular Physiology, Goethe-University, 60590 Frankfurt, Germany; (P.F.M.); (J.B.); (M.L.); (T.W.); (N.M.); (R.P.B.)
- German Centre for Cardiovascular Research (DZHK), Partner Site Rhein-Main, 60590 Frankfurt, Germany
- Correspondence: ; Tel.: +49-69-6301-6996; Fax: +49-69-6301-7668
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Yoon HJ, Jung WP, Min YS, Jin F, Bang JS, Sohn UD, Je HD. The Effect of Galangin on the Regulation of Vascular Contractility via the Holoenzyme Reactivation Suppressing ROCK/CPI-17 rather than PKC/CPI-17. Biomol Ther (Seoul) 2021; 30:145-150. [PMID: 34231489 PMCID: PMC8902457 DOI: 10.4062/biomolther.2021.087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/10/2021] [Accepted: 06/18/2021] [Indexed: 11/05/2022] Open
Abstract
In this study, we investigated the influence of galangin on vascular contractibility and to determine the mechanism underlying the relaxation. Isometric contractions of denuded aortic muscles were recorded and combined with western blot analysis which was performed to measure the phosphorylation of phosphorylation-dependent inhibitory protein of myosin phosphatase (CPI-17) and myosin phosphatase targeting subunit 1 (MYPT1) and to evaluate the effect of galangin on the RhoA/ROCK/CPI-17 pathway. Galangin significantly inhibited phorbol ester-, fluoride- and thromboxane mimetic-induced vasoconstrictions regardless of endothelial nitric oxide synthesis, suggesting its direct effect on vascular smooth muscle. Galangin significantly inhibited the fluoridedependent increase in pMYPT1 and pCPI-17 levels and phorbol 12,13-dibutyrate-dependent increase in pERK1/2 level, suggesting repression of ROCK and MEK activity and subsequent phosphorylation of MYPT1, CPI-17 and ERK1/2. Taken together, these results suggest that galangin-induced relaxation involves myosin phosphatase reactivation and calcium desensitization, which appears to be mediated by CPI-17 dephosphorylation via not PKC but ROCK inactivation.
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Affiliation(s)
- Hyuk-Jun Yoon
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Won Pill Jung
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
| | - Young Sil Min
- Department of Pharmaceutical Science, Jungwon University, Goesan 28024, Republic of Korea
| | - Fanxue Jin
- Department of Pharmacology, Kyungpook National University School of Medicine, Daegu 41944, Republic of Korea
| | - Joon Seok Bang
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Daegu Catholic University, Gyeongsan 38430, Republic of Korea
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Ozen G, Aljesri K, Celik Z, Turkyılmaz G, Turkyılmaz S, Teskin O, Norel X, Topal G. Mechanism of thromboxane receptor-induced vasoconstriction in human saphenous vein. Prostaglandins Other Lipid Mediat 2020; 151:106476. [PMID: 32721526 DOI: 10.1016/j.prostaglandins.2020.106476] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/29/2020] [Accepted: 07/16/2020] [Indexed: 12/18/2022]
Abstract
Saphenous vein (SV) is one of the most widely used graft material in patients undergoing coronary artery bypass graft surgery (CABG). Thromboxane A2 (TXA2) is implicated in graft failure by inducing vasoconstriction and platelet aggregation. The aim of this study is to investigate the mechanism involved in TXA2-induced vasoconstriction in human SV. The role of different inhibitors and blockers on U46619 (TXA2-mimetic)-induced vasoconstriction is investigated by using an isolated organ bath system. Relaxation responses to several mediators are evaluated in SV pre-contracted with U46619 and compared with those pre-contracted with phenylephrine. Our results demonstrate that U46619-induced contraction is completely blocked by myosin light chain kinase inhibitor ML-9 or TP receptor antagonist BAY u3405. Furthermore, U46619-induced contraction is partially inhibited by phospholipase C inhibitor U73122, protein kinase C inhibitor calphostin C, Rho-kinase inhibitor Y-27632, L-type calcium channel blocker nifedipine, store-operated channel inhibitor SKF96365 or removal of extracellular calcium. Relaxation responses to NO donor (sodium nitroprusside), guanylate cyclase (GC) stimulator (riociguat), phosphodiesterase (PDE) inhibitors (sildenafil, IBMX), adenylate cyclase (AC) activator (forskolin) and acetylcholine (ACh) are markedly reduced when U46619 is used as a pre-contraction agent. Our results demonstrate that influx of extracellular Ca2+ (through L-type calcium channels and store-operated calcium channels) and intracellular Ca2+ release together with Ca2+ sensitization (through Rho-kinase activation) are necessary components for TXA2-induced vasoconstriction in SV. Moreover, more pronounced decrease in vasorelaxation induced by several mediators (SNP, riociguat, sildenafil, IBMX, forskolin, and ACh) in the presence of U46619 when compared with phenylephrine suggests that there is a crosstalk between the TP receptor signaling pathway and PDE, AC, GC enzymes. We believe that the investigation of mechanism of the TXA2-induced vasoconstriction in SV will provide additional information for the prevention of SV graft failure.
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Affiliation(s)
- Gulsev Ozen
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul 34116, Turkey.
| | - Khadija Aljesri
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul 34116, Turkey
| | - Zeynep Celik
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul 34116, Turkey
| | - Gulsum Turkyılmaz
- Department of Cardiovascular Surgery, Bakirkoy Dr Sadi Konuk Education and Research Hospital Bakırkoy, Istanbul, Turkey
| | - Saygın Turkyılmaz
- Department of Cardiovascular Surgery, Bakirkoy Dr Sadi Konuk Education and Research Hospital Bakırkoy, Istanbul, Turkey
| | - Onder Teskin
- Department of Cardiovascular Surgery, Biruni University, Istanbul, Turkey
| | - Xavier Norel
- Université de Paris, INSERM, UMR-S 1148, CHU X. Bichat, 75018 Paris, France
| | - Gokce Topal
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul 34116, Turkey
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Choi SK, Kwon Y, Byeon S, Haam CE, Lee YH. AdipoRon, adiponectin receptor agonist, improves vascular function in the mesenteric arteries of type 2 diabetic mice. PLoS One 2020; 15:e0230227. [PMID: 32182257 PMCID: PMC7077821 DOI: 10.1371/journal.pone.0230227] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 02/15/2020] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND An orally active synthetic adiponectin receptor agonist, AdipoRon has been suggested to ameliorate insulin resistance, and glucose tolerance. However, the chronic effect of AdipoRon in the vascular dysfunction in type 2 diabetes has not been studied yet. Thus, in this study, we examined whether AdipoRon improves vascular function in type 2 diabetes. METHODS Type 2 diabetic (db-/db-) mice were treated with AdipoRon (10 mg/kg/everyday, by oral gavage) for 2 weeks. Body weight and blood glucose levels were recorded every other day during the experimental period. Diameter of mesenteric arteries was measured. And western blot analysis was performed with mesenteric arteries. RESULTS Pressure-induced myogenic response was significantly increased while endothelium-dependent relaxation was reduced in the mesenteric arteries of db-/db- mice. Treatment of AdipoRon normalized potentiated myogenic response, whereas endothelium-dependent relaxation was not affected by treatment of AdipoRon. The expression levels of AdiR1, AdiR2, APPL1, and APPL 2 were increased in the mesenteric arteries of db-/db- mice and treatment of AdipoRon did not affect them. Interestingly, AdipoRon treatment increased the phospho-AMPK and decreased MYPT1 phosphorylation in db-/db- mice while there was no change in the level of eNOS phosphorylation. CONCLUSION The treatment of AdipoRon improves vascular function in the mesenteric arteries of db-/db- mice through endothelium-independent mechanism. We suggest that MLCP activation through reduced phosphorylation of MYPT1 might be the dominant mechanism in the AdipoRon-induced vascular effect.
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Affiliation(s)
- Soo-Kyoung Choi
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul, Korea
| | - Youngin Kwon
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul, Korea
| | - Seonhee Byeon
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul, Korea
| | - Chae Eun Haam
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul, Korea
| | - Young-Ho Lee
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul, Korea
- * E-mail:
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Exaggerated blood pressure response to fasudil or nifedipine in hypertensive Ren-2 transgenic rats: role of altered baroreflex. Hypertens Res 2018; 42:145-154. [PMID: 30518983 DOI: 10.1038/s41440-018-0146-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/18/2018] [Accepted: 05/25/2018] [Indexed: 11/08/2022]
Abstract
Basal calcium sensitization is decreased in spontaneously hypertensive rats, although their blood pressure (BP) response to acute Rho-kinase inhibition is enhanced. Using fasudil (Rho-kinase inhibitor) or nifedipine (L-VDCC blocker), we evaluated the contribution of calcium sensitization and calcium entry to BP maintenance in hypertensive transgenic Ren-2 rats (TGR) focusing on the influence of major vasoactive systems and/or baroreflex efficiency on BP responses to these two drugs. Homozygous TGR and normotensive Hannover Sprague-Dawley (HanSD) control rats aged 5, 11, or 22 weeks were used. The acute BP-lowering effects of fasudil or nifedipine were studied in intact rats, nitric oxide-deficient L-NAME-pretreated rats and rats subjected to combined blockade of the renin-angiotensin system (RAS), sympathetic nervous system (SNS) and nitric oxide synthase (NOS). Fasudil- or nifedipine-induced BP reduction increased during hypertension development in TGR. By contrast, the nifedipine-induced BP response decreased, whereas the fasudil-induced BP response increased with age in HanSD controls. Our data indicated a major contribution of nifedipine-sensitive calcium entry and relative attenuation of calcium sensitization in hypertensive rats compared with normotensive controls. The BP responses to fasudil or nifedipine were enhanced by NOS inhibition and combined blockade in normotensive HanSD rats but not in hypertensive TGR. In conclusion, calcium sensitization is attenuated by endogenous nitric oxide in normotensive HanSD rats but not in hypertensive TGR. Moreover, BP reduction elicited by acute Rho-kinase inhibition is partially compensated by enhanced sympathetic vasoconstriction. The decreased compensation in hypertensive rats with impaired baroreflex efficiency explains their greater BP response to fasudil than in normotensive animals.
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Zhou F, Rao F, Deng YQ, Yang H, Kuang SJ, Wu FL, Wu SL, Xue YM, Wu XM, Deng CY. Atorvastatin ameliorates the contractile dysfunction of the aorta induced by organ culture. Naunyn Schmiedebergs Arch Pharmacol 2018; 392:19-28. [DOI: 10.1007/s00210-018-1559-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 08/15/2018] [Indexed: 11/29/2022]
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Min YS, Yoon HJ, Je HD, Lee JH, Yoo SS, Shim HS, Lee HY, La HO, Sohn UD. Endothelium Independent Effect of Pelargonidin on Vasoconstriction in Rat Aorta. Biomol Ther (Seoul) 2018; 26:374-379. [PMID: 29390250 PMCID: PMC6029677 DOI: 10.4062/biomolther.2017.197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 12/18/2017] [Accepted: 12/21/2017] [Indexed: 02/07/2023] Open
Abstract
In this study, we investigated the effects of pelargonidin, an anthocyanidin found in many fruits and vegetables, on endothelium-independent vascular contractility to determine the underlying mechanism of relaxation. Isometric contractions of denuded aortic muscles from male rats were recorded, and the data were combined with those obtained in western blot analysis. Pelargonidin significantly inhibited fluoride-, thromboxane A2-, and phorbol ester-induced vascular contractions, regardless of the presence or absence of endothelium, suggesting a direct effect of the compound on vascular smooth muscles via a different pathway. Pelargonidin significantly inhibited the fluoride-dependent increase in the level of myosin phosphatase target subunit 1 (MYPT1) phosphorylation at Thr-855 and the phorbol 12,13-dibutyrate-dependent increase in the level of extracellular signal-regulated kinase (ERK) 1/2 phosphorylation at Thr202/Tyr204, suggesting the inhibition of Rho-kinase and mitogen-activated protein kinase kinase (MEK) activities and subsequent phosphorylation of MYPT1 and ERK1/2. These results suggest that the relaxation effect of pelargonidin on agonist-dependent vascular contractions includes inhibition of Rho-kinase and MEK activities, independent of the endothelial function.
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Affiliation(s)
- Young Sil Min
- Department of Medical Plant Science, College of Scienceand Engineering, Jung Won University, Goesan 28024, Republic of Korea
| | - Hyuk-Jun Yoon
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea
| | - Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea
| | - Jong Hyuk Lee
- Department of Pharmaceutical Engineering, College of Life and Health Science, Hoseo University, Asan 31499, Republic of Korea
| | - Seong Su Yoo
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyun Sub Shim
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hak Yeong Lee
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyen-Oh La
- Department of Clinical Pharmacology, College of Pharmacy, Catholic University of Korea, Bucheon 14662, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
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Mochalov SV, Tarasova NV, Kudryashova TV, Gaynullina DK, Kalenchuk VU, Borovik AS, Vorotnikov AV, Tarasova OS, Schubert R. Higher Ca 2+ -sensitivity of arterial contraction in 1-week-old rats is due to a greater Rho-kinase activity. Acta Physiol (Oxf) 2018; 223:e13044. [PMID: 29383848 DOI: 10.1111/apha.13044] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 01/23/2018] [Accepted: 01/24/2018] [Indexed: 12/22/2022]
Abstract
AIM During early post-natal development, arterial contraction depends less on Ca2+ -signalling pathways but more on changes in Ca2+ -sensitivity compared to adult animals. Whether this difference is related to Rho-kinase, one of the major players affecting Ca2+ -sensitivity, is unknown for intact vessels. Thus, we tested the hypothesis that Rho-kinase critically contributes to the higher Ca2+ -sensitivity of contraction in intact arteries of 1-week-old rats. METHODS We studied 1-week-old, 4- to 5-week-old and 10- to 12-week-old rats performing isometric myography, Ca2+ -fluorimetry and Western blotting using intact saphenous arteries and arterial pressure measurements under urethane anaesthesia. RESULTS In 10- to 12-week-old rats, methoxamine (MX) produced vasoconstriction associated with an increase in [Ca2+ ]i and Ca2+ -sensitivity. In contrast, in 1-week-old rats these contractions were accompanied only by an increase in Ca2+ -sensitivity. All MX-induced effects were reduced by the Rho-kinase inhibitor Y-27632; this reduction was complete only in 1-week-old rats. The Rho-kinase specific site Thr855 on MYPT1 was increasingly phosphorylated by MX in vessels of 1-week-old, but not 10- to 12-week-old rats; this effect was also inhibited completely by Y-27632. The Rho-kinase inhibitor fasudil in a dose not affecting the pressor response to MX in 4- to 5-week-old rats reduced it considerably in 1-week-old rats. CONCLUSION Our results suggest that the higher Ca2+ -sensitivity of arterial contraction in 1-week-old compared to 10- to 12-week-old rats is due to a greater Rho-kinase activity. Constitutively active Rho-kinase contributes to MX-induced contraction in 10- to 12-week-old rats. In 1-week-old rats, additional Rho-kinase activation is involved. This remodelling of the Rho-kinase pathway is associated with its increased contribution to adrenergic arterial pressure responses.
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Affiliation(s)
- S. V. Mochalov
- Medical Faculty Mannheim; Centre for Biomedicine and Medical Technology Mannheim (CBTM) and European Center of Angioscience (ECAS); Research Division Cardiovascular Physiology; Heidelberg University; Mannheim Germany
- Faculty of Biology, M.V. Lomonosov; Moscow State University; Moscow Russia
- ChemRar Research and Development Institute; Khimki Moscow Region Russia
| | - N. V. Tarasova
- Medical Faculty Mannheim; Centre for Biomedicine and Medical Technology Mannheim (CBTM) and European Center of Angioscience (ECAS); Research Division Cardiovascular Physiology; Heidelberg University; Mannheim Germany
- Faculty of Biology, M.V. Lomonosov; Moscow State University; Moscow Russia
- Molecular Medicine Institute; I.M. Sechenov First Moscow State Medical University; Moscow Russia
| | - T. V. Kudryashova
- Institute of Experimental Cardiology; Cardiology Research Center; Moscow Russia
| | - D. K. Gaynullina
- Medical Faculty Mannheim; Centre for Biomedicine and Medical Technology Mannheim (CBTM) and European Center of Angioscience (ECAS); Research Division Cardiovascular Physiology; Heidelberg University; Mannheim Germany
- Faculty of Biology, M.V. Lomonosov; Moscow State University; Moscow Russia
- Department of Physiology; Russian National Research Medical University; Moscow Russia
| | - V. U. Kalenchuk
- Faculty of Basic Medicine; M.V. Lomonosov Moscow State University; Moscow Russia
| | - A. S. Borovik
- State Research Center of the Russian Federation - Institute for Biomedical Problems; Russian Academy of Sciences; Moscow Russia
| | - A. V. Vorotnikov
- Institute of Experimental Cardiology; Cardiology Research Center; Moscow Russia
- Medical Center; M.V. Lomonosov Moscow State University; Moscow Russia
| | - O. S. Tarasova
- Faculty of Biology, M.V. Lomonosov; Moscow State University; Moscow Russia
- State Research Center of the Russian Federation - Institute for Biomedical Problems; Russian Academy of Sciences; Moscow Russia
| | - R. Schubert
- Medical Faculty Mannheim; Centre for Biomedicine and Medical Technology Mannheim (CBTM) and European Center of Angioscience (ECAS); Research Division Cardiovascular Physiology; Heidelberg University; Mannheim Germany
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Ishida H, Saito SY, Hishinuma E, Kitayama T, Ishikawa T. Differential contribution of calcium channels to α 1-adrenoceptor-mediated contraction is responsible for diverse responses to cooling between rat tail and iliac arteries. Eur J Pharmacol 2018; 826:9-16. [PMID: 29458039 DOI: 10.1016/j.ejphar.2018.02.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 01/30/2018] [Accepted: 02/16/2018] [Indexed: 01/29/2023]
Abstract
Our previous studies have shown that α1-adrenoceptors, in addition to α2-adrenoceptors, are involved in enhanced contraction of cutaneous blood vessels during cooling. The present study aimed to elucidate the mechanism underlying it. In tail and iliac arteries isolated from rats, isometric contraction was measured using a myograph and the phosphorylation level of myosin phosphatase target subunit 1 (MYPT1) was quantified by western blotting. The phenylephrine-induced contraction was enhanced by cooling to 24 °C in tail arteries, but was suppressed in iliac arteries. Endothelium denudation or treatment with iberiotoxin enhanced the phenylephrine-induced contraction in tail arteries at 37 °C; however, neither affected the contraction at 24 °C. The phenylephrine-induced contraction at 37 °C was largely suppressed by nifedipine in iliac arteries, but only slightly in tail arteries. The Rho kinase inhibitor H-1152 largely suppressed the phenylephrine-induced contraction at 24 °C, but only slightly at 37 °C, in both arteries. The phosphorylation level of MYPT1 at Thr855 in tail arteries was increased by the cooling. Taken together, these results suggest the following mechanism in regard to cooling-induced enhancement of α1-adrenoceptor-mediated contraction in tail arteries: Cooling enhances the contraction of tail arteries via α1-adrenoceptor stimulation by reducing endothelium-dependent, large-conductance Ca2+-activated K+ channel-mediated relaxation and by inducing Rho kinase-mediated Ca2+ sensitization, although the latter occurs even in iliac arteries. A smaller contribution of voltage-dependent Ca2+ channels, which are largely suppressed by cooling, to α1-adrenoceptor-mediated contraction in tail arteries seems to be more crucially involved in the appearance of the enhanced contractile response to cooling.
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Affiliation(s)
- Hirotake Ishida
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka City, Shizuoka 422-8526, Japan
| | - Shin-Ya Saito
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka City, Shizuoka 422-8526, Japan.
| | - Eita Hishinuma
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka City, Shizuoka 422-8526, Japan
| | - Tomoaki Kitayama
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka City, Shizuoka 422-8526, Japan
| | - Tomohisa Ishikawa
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka City, Shizuoka 422-8526, Japan
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12
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Characterization of pressure-mediated vascular tone in resistance arteries from bile duct-ligated rats. Oncotarget 2018; 8:30706-30722. [PMID: 28430609 PMCID: PMC5458161 DOI: 10.18632/oncotarget.15409] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 02/01/2017] [Indexed: 12/15/2022] Open
Abstract
In cirrhosis, changes in pressure-mediated vascular tone, a key determinant of systemic vascular resistance (SVR), are unknown. To address this gap in knowledge, we assessed ex vivo dynamics of pressurized mesenteric resistance arteries (diameter ~ 260 μm) from bile duct-ligated (BDL) and sham-operated (SHAM) rats and determined the underlying mechanisms. At isobaric intraluminal pressure (70 mmHg) as well as with step-wise increase in pressure (10-110 mmHg), arteries from SHAM-rats constricted more than BDL-rats, and had reduced luminal area. In both groups, incubation with LNAME (a NOS inhibitor) had no effect on pressure-mediated tone, and expression of NOS isoforms were similar. TEA, which enhances Ca2+ influx, augmented arterial tone only in SHAM-rats, with minimal effect in those from BDL-rats that was associated with reduced expression of Ca2+ channel TRPC6. In permeabilized arteries, high-dose Ca2+ and γGTP enhanced the vascular tone, which remained lower in BDL-rats that was associated with reduced ROCK2 and pMLC expression. Further, compared to SHAM-rats, in BDL-rats, arteries had reduced collagen expression which was associated with increased expression and activity of MMP-9. BDL-rats also had increased plasma reactive oxygen species (ROS). In vascular smooth muscle cells in vitro, peroxynitrite enhanced MMP-9 activity and reduced ROCK2 expression. These data provide evidence that in cirrhosis, pressure-mediated tone is reduced in resistance arteries, and suggest that circulating ROS play a role in reducing Ca2+ sensitivity and enhancing elasticity to induce arterial adaptations. These findings provide insights into mechanisms underlying attenuated SVR in cirrhosis.
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13
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Chung YH, Oh KW, Kim ST, Park ES, Je HD, Yoon HJ, Sohn UD, Jeong JH, La HO. Hypothermia Inhibits Endothelium-Independent Vascular Contractility via Rho-kinase Inhibition. Biomol Ther (Seoul) 2018; 26:139-145. [PMID: 28208012 PMCID: PMC5839492 DOI: 10.4062/biomolther.2016.233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/11/2016] [Accepted: 12/27/2016] [Indexed: 01/21/2023] Open
Abstract
The present study was undertaken to investigate the influence of hypothermia on endothelium-independent vascular smooth muscle contractility and to determine the mechanism underlying the relaxation. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Hypothermia significantly inhibited fluoride-, thromboxane A2-, phenylephrine-, and phorbol ester-induced vascular contractions regardless of endothelial nitric oxide synthesis, suggesting that another pathway had a direct effect on vascular smooth muscle. Hypothermia significantly inhibited the fluoride-induced increase in pMYPT1 level and phorbol ester-induced increase in pERK1/2 level, suggesting inhibition of Rho-kinase and MEK activity and subsequent phosphorylation of MYPT1 and ERK1/2. These results suggest that the relaxing effect of moderate hypothermia on agonist-induced vascular contraction regardless of endothelial function involves inhibition of Rho-kinase and MEK activities.
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Affiliation(s)
- Yoon Hee Chung
- Department of Anatomy, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Keon Woong Oh
- Department of Pathology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sung Tae Kim
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Eon Sub Park
- Department of Pathology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea
| | - Hyuk-Jun Yoon
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul 06974, Republic of Korea
| | - Ji Hoon Jeong
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyen-Oh La
- Department of Pharmacology, College of Pharmacy, The Catholic University of Korea, Bucheon 14662, Republic of Korea
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14
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Chen H. Role of thromboxane A 2 signaling in endothelium-dependent contractions of arteries. Prostaglandins Other Lipid Mediat 2017; 134:32-37. [PMID: 29180071 DOI: 10.1016/j.prostaglandins.2017.11.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 11/13/2017] [Accepted: 11/17/2017] [Indexed: 12/18/2022]
Abstract
Thromboxane A2 (TxA2) plays a very important role in various cardiovascular diseases through its action on platelet aggregation, vasoconstriction, and proliferation. The present article focuses on the role of TxA2 signaling in endothelium-dependent contractions of arteries. Arachidonic acid (AA) is metabolized by cyclooxygenase (COX) to form the unstable prostaglandin H2 which is further converted into TxA2. After being produced by thromboxane synthase (TxAS), TxA2 ultimately stimulates TxA2/prostanoid (TP) receptor to induce vasoconstriction. The calcium ionophore A23187, the prostanoid precursor AA, or the muscarinic receptor agonist acetylcholine (ACh) can evoke endothelium-dependent contractions associated with TxA2. The endothelium-dependent contractions shown in hypertension, diabetes, atherogenesis, and other cardiovascular diseases have been significantly reduced by antagonism of COX, TxAS, or TP receptor. So inhibition of the bioavailability and/or effect of TxA2 may be promising therapeutic targets to prevent these diseases. Especially some bioactive compounds isolated from medicinal plants will provide new pharmacological approaches to promote vascular health.
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Affiliation(s)
- H Chen
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian 116044, PR China.
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15
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Abstract
Traditionally, only the 3',5'-cyclic monophosphates of adenosine and guanosine (produced by adenylyl cyclase and guanylyl cyclase, respectively) are regarded as true "second messengers" in the vascular wall, despite the presence of other cyclic nucleotides in different tissues. Among these noncanonical cyclic nucleotides, inosine 3',5'-cyclic monophosphate (cIMP) is synthesized by soluble guanylyl cyclase in porcine coronary arteries in response to hypoxia, when the enzyme is activated by endothelium-derived nitric oxide. Its production is associated with augmentation of vascular contraction mediated by stimulation of Rho kinase. Based on these findings, cIMP appears to meet most, if not all, of the criteria required for it to be accepted as a "second messenger," at least in the vascular wall.
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16
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Basal and Activated Calcium Sensitization Mediated by RhoA/Rho Kinase Pathway in Rats with Genetic and Salt Hypertension. BIOMED RESEARCH INTERNATIONAL 2017; 2017:8029728. [PMID: 28197417 PMCID: PMC5288518 DOI: 10.1155/2017/8029728] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 11/27/2016] [Accepted: 12/15/2016] [Indexed: 11/17/2022]
Abstract
Calcium sensitization mediated by RhoA/Rho kinase pathway can be evaluated either in the absence (basal calcium sensitization) or in the presence of endogenous vasoconstrictor systems (activated calcium sensitization). Our aim was to compare basal and activated calcium sensitization in three forms of experimental hypertension with increased sympathetic tone and enhanced calcium entry—spontaneously hypertensive rats (SHR), heterozygous Ren-2 transgenic rats (TGR), and salt hypertensive Dahl rats. Activated calcium sensitization was determined as blood pressure reduction induced by acute administration of Rho kinase inhibitor fasudil in conscious rats with intact sympathetic nervous system (SNS) and renin-angiotensin system (RAS). Basal calcium sensitization was studied as fasudil-dependent difference in blood pressure response to calcium channel opener BAY K8644 in rats subjected to RAS and SNS blockade. Calcium sensitization was also estimated from reduced development of isolated artery contraction by Rho kinase inhibitor Y-27632. Activated calcium sensitization was enhanced in all three hypertensive models (due to the hyperactivity of vasoconstrictor systems). In contrast, basal calcium sensitization was reduced in SHR and TGR relative to their controls, whereas it was augmented in salt-sensitive Dahl rats relative to their salt-resistant controls. Similar differences in calcium sensitization were seen in femoral arteries of SHR and Dahl rats.
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17
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Brunová A, Bencze M, Behuliak M, Zicha J. Acute and chronic role of nitric oxide, renin-angiotensin system and sympathetic nervous system in the modulation of calcium sensitization in Wistar rats. Physiol Res 2016; 64:447-57. [PMID: 26291725 DOI: 10.33549/physiolres.933094] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Principal vasoactive systems - renin-angiotensin system (RAS), sympathetic nervous system (SNS), nitric oxide (NO) and prostanoids - exert their vascular effects through the changes in calcium levels and/or calcium sensitization. To estimate a possible modulation of calcium sensitization by the above vasoactive systems, we studied the influence of acute and chronic blockade of particular vasoactive systems on blood pressure (BP) changes elicited in conscious normotensive rats by acute dose-dependent administration of Rho-kinase inhibitor fasudil. Adult male chronically cannulated Wistar rats were used throughout this study. The acute inhibition of NO synthase (NOS) by L-NAME enhanced BP response to fasudil, the effect being considerably augmented in rats deprived of endogenous SNS. The acute inhibition of prostanoid synthesis by indomethacin modified BP response to fasudil less than the acute NOS inhibition. The chronic NOS inhibition caused moderate BP elevation and a more pronounced augmentation of fasudil-induced BP changes compared to the effect of acute NOS inhibition. This indicates both short-term and long-term NO-dependent attenuation of calcium sensitization. Long-term inhibition of RAS by captopril caused a significant attenuation of BP changes elicited by fasudil. In contrast, a long-term attenuation of SNS by chronic guanethidine treatment (in youth or adulthood) had no effect on BP response to fasudil, suggesting the absence of SNS does not affect calcium sensitization in vascular smooth muscle of normotensive rats. In conclusion, renin-angiotensin system contributes to the long-term increase of calcium sensitization and its effect is counterbalanced by nitric oxide which decreases calcium sensitization in Wistar rats.
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Affiliation(s)
- A Brunová
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
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18
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Je HD, Sohn UD, La HO. Endothelium-Independent Effect of Fisetin on the Agonist-Induced Regulation of Vascular Contractility. Biomol Ther (Seoul) 2016; 24:57-61. [PMID: 26759702 PMCID: PMC4703353 DOI: 10.4062/biomolther.2015.104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 08/03/2015] [Accepted: 08/07/2015] [Indexed: 01/16/2023] Open
Abstract
Fisetin, a natural flavonoid found in a variety of vegetables and fruits, has been shown to possess many biological functions. The present study was undertaken to investigate the influence of fisetin on vascular smooth muscle contractility and to determine the mechanism involved. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Fisetin significantly relaxed fluoride-, thromboxane A2- or phorbol ester-induced vascular contraction suggesting as a possible anti-hypertensive on the agonist-induced vascular contraction regardless of endothelial nitric oxide synthesis. Furthermore, fisetin significantly inhibited fluoride-induced increases in pMYPT1 levels and phorbol ester-induced increases in pERK1/2 levels suggesting the mechanism involving the inhibition of Rho-kinase activity and the subsequent phosphorylation of MYPT1 and MEK activity and the subsequent phosphorylation of ERK1/2. This study provides evidence regarding the mechanism underlying the relaxation effect of fisetin on agonist-induced vascular contraction regardless of endothelial function.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongbuk 38430, Republic of Korea
| | - Uy Dong Sohn
- Department of Pharmacology, College of Pharmacy, Chung Ang University, Seoul 06974, Republic of Korea
| | - Hyen-Oh La
- Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul 14662, Republic of Korea
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19
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Je HD, Jeong JH. Cardamonin inhibits agonist-induced vascular contractility via Rho-kinase and MEK inhibition. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2015; 20:69-74. [PMID: 26807025 PMCID: PMC4722193 DOI: 10.4196/kjpp.2016.20.1.69] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 09/24/2015] [Accepted: 10/21/2015] [Indexed: 01/21/2023]
Abstract
The present study was undertaken to investigate the influence of cardamonin on vascular smooth muscle contractility and to determine the mechanism(s) involved. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Cardamonin significantly relaxed fluoride-, phenylephrine-, and phorbol ester-induced vascular contractions, suggesting that it has an anti-hypertensive effect on agonist-induced vascular contraction regardless of endothelial nitric oxide synthesis. Furthermore, cardamonin significantly inhibited the fluoride-induced increase in pMYPT1 level and phenylephrine-induced increase in pERK1/2 level, suggesting inhibition of Rho-kinase and MEK activity and subsequent phosphorylation of MYPT1 and ERK1/2. This study provides evidence that the relaxing effect of cardamonin on agonist-induced vascular contraction regardless of endothelial function involves inhibition of Rho-kinase and MEK activity.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Korea
| | - Ji Hoon Jeong
- College of Medicine, Chung-Ang University, Seoul 06974, Korea.; Research Institute for Translational System Biomics, Chung-Ang University, Seoul 06974, Korea
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20
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Ontogenetic changes in contribution of calcium sensitization and calcium entry to blood pressure maintenance of Wistar–Kyoto and spontaneously hypertensive rats. J Hypertens 2015; 33:2443-54. [DOI: 10.1097/hjh.0000000000000746] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Aydinoglu F, Ergurhan Kiroglu O, Astarci E, Balli E, Ogulener N. Effects of ethanol on RhoA/Rho-kinase-mediated calcium sensitization in mouse lung parenchymal tissue. Eur J Pharmacol 2015; 764:318-327. [PMID: 26169563 DOI: 10.1016/j.ejphar.2015.07.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/29/2015] [Accepted: 07/08/2015] [Indexed: 11/16/2022]
Abstract
Calcium sensitization by the RhoA/Rho-kinase (ROCK) pathway contributes to the contraction in smooth muscle. Contractile stimuli can sensitize myosin to Ca(2+) by activating RhoA/Rho-kinase that inhibits myosin light chain phosphatase activity. The present study was aimed at investigating the possible involvement of RhoA/Rho-kinase pathway in contractile responses to agonist (phenylephrine) and depolarizing (KCl) of mouse lung parenchymal tissues. Also, we investigated the effect of ethanol on RhoA/Rho-kinase pathway. Phenylephrine (10(-8)-10(-4) M) and KCl (10-80 mM) induced sustained contractions in parenchymal strips. Ethanol significantly attenuated the contractions to phenylephrine and KCl. The Rho-kinase inhibitors fasudil (5×10(-5) M) and Y-27632 (5×10(-5) M) inhibited contractions to in both control and ethanol-treated parenchymal strips. In addition, the relaxations induced by fasudil (10(-4) M) and Y-27632 (5×10(-4) M) on parenchymal strips contracted by phenylephrine but not KCl was decreased in ethanol-treatment group. Also, RhoA, ROCK1 and ROCK2 expressions were detected in mouse lung parenchymal tissue. In ethanol-treated group, expression of RhoA and ROCK1 but not ROCK2 decreased compared to control. Furthermore, ethanol causes apoptotic changes in alveolar type I epithelial cells of parenchymal tissue. These results suggest that RhoA/Rho-kinase signaling pathway plays an important role in phenylephrine- and KCl-induced Ca(2)(+) sensitization in mouse lung parenchymal tissue. Also, ethanol may be decrease phenylephrine- and KCl-induced contraction due to lowering the RhoA/Rho-kinase-mediated Ca(2+)-sensitizing by inhibiting RhoA/Rho-kinase pathway in parenchymal tissue. These results may be lead to important insights into the mechanisms of lung diseases due to alcohol consumption.
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Affiliation(s)
- Fatma Aydinoglu
- Department of Pharmacology, Pharmacy Faculty, Cukurova University, Adana, Turkey
| | | | - Erhan Astarci
- Department of Plant and Animal Production, Mudurnu Süreyya Astarci Vocational School, Abant Izzet Baysal University, Bolu, Turkey
| | - Ebru Balli
- Department of Histology and Embryology, Medical Faculty, Mersin University, Mersin, Turkey
| | - Nuran Ogulener
- Department of Pharmacology, Medical Faculty, Cukurova University, Adana, Turkey.
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22
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Abstract
Chronic rejection of transplanted organs remains the main obstacle in the long-term success of organ transplantation. Thus, there is a persistent quest for development of antichronic rejection therapies and identification of novel molecular and cellular targets. One of the potential targets is the pericytes, the mural cells of microvessels, which regulate microvascular permeability, development, and maturation by controlling endothelial cell functions and regulating tissue fibrosis and inflammatory response. In this review, we discuss the potential of targeting pericytes in the development of microvasular dysfunction and the molecular pathways involved in regulation of pericyte activities for antichronic rejection intervention.
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23
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Je HD, Kim HD, La HO. The inhibitory effect of shikonin on the agonist-induced regulation of vascular contractility. Biomol Ther (Seoul) 2015; 23:233-7. [PMID: 25995821 PMCID: PMC4428715 DOI: 10.4062/biomolther.2014.148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 02/04/2015] [Accepted: 02/05/2015] [Indexed: 01/21/2023] Open
Abstract
Shikonin, a natural flavonoid found in the roots of Lithospermum erythrorhizon, has been shown to possess many biological functions. The present study was undertaken to investigate the influence of shikonin on vascular smooth muscle contractility and to determine the mechanism involved. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Shikonin significantly relaxed fluoride-, thromboxane A2- or phorbol ester-induced vascular contraction suggesting as a possible anti-hypertensive on the agonist-induced vascular contraction regardless of endothelial nitric oxide synthesis. Furthermore, shikonin significantly inhibited fluoride-induced increases in pMYPT1 levels and phorbol ester-induced increases in pERK1/2 levels suggesting the mechanism involving the inhibition of Rho-kinase activity and the subsequent phosphorylation of MYPT1 and the inhibition of MEK activity and the subsequent phosphorylation of ERK1/2. This study provides evidence regarding the mechanism underlying the relaxation effect of shikonin on agonist-induced vascular contraction regardless of endothelial function.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongbuk 712-702
| | - Hyeong-Dong Kim
- Department of Physical Therapy, College of Health Science, Korea University, Seoul, 336-871
| | - Hyen-Oh La
- Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul 137-701, Republic of Korea
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24
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Billaud M, Chiu YH, Lohman AW, Parpaite T, Butcher JT, Mutchler SM, DeLalio LJ, Artamonov MV, Sandilos JK, Best AK, Somlyo AV, Thompson RJ, Le TH, Ravichandran KS, Bayliss DA, Isakson BE. A molecular signature in the pannexin1 intracellular loop confers channel activation by the α1 adrenoreceptor in smooth muscle cells. Sci Signal 2015; 8:ra17. [PMID: 25690012 DOI: 10.1126/scisignal.2005824] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Both purinergic signaling through nucleotides such as ATP (adenosine 5'-triphosphate) and noradrenergic signaling through molecules such as norepinephrine regulate vascular tone and blood pressure. Pannexin1 (Panx1), which forms large-pore, ATP-releasing channels, is present in vascular smooth muscle cells in peripheral blood vessels and participates in noradrenergic responses. Using pharmacological approaches and mice conditionally lacking Panx1 in smooth muscle cells, we found that Panx1 contributed to vasoconstriction mediated by the α1 adrenoreceptor (α1AR), whereas vasoconstriction in response to serotonin or endothelin-1 was independent of Panx1. Analysis of the Panx1-deficient mice showed that Panx1 contributed to blood pressure regulation especially during the night cycle when sympathetic nervous activity is highest. Using mimetic peptides and site-directed mutagenesis, we identified a specific amino acid sequence in the Panx1 intracellular loop that is essential for activation by α1AR signaling. Collectively, these data describe a specific link between noradrenergic and purinergic signaling in blood pressure homeostasis.
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Affiliation(s)
- Marie Billaud
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Yu-Hsin Chiu
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Alexander W Lohman
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Thibaud Parpaite
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Joshua T Butcher
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Stephanie M Mutchler
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Leon J DeLalio
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Mykhaylo V Artamonov
- Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Joanna K Sandilos
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Angela K Best
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Avril V Somlyo
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Roger J Thompson
- Department of Cell Biology and Anatomy, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Thu H Le
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Kodi S Ravichandran
- Center for Cell Clearance, University of Virginia, Charlottesville, VA 22908, USA. Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, VA 22908, USA. Beirne B. Carter Center for Immunology Research, University of Virginia, Charlottesville, VA 22908, USA
| | - Douglas A Bayliss
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Brant E Isakson
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
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25
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Goyal R, Goyal D, Chu N, Van Wickle J, Longo LD. Cerebral artery alpha-1 AR subtypes: high altitude long-term acclimatization responses. PLoS One 2014; 9:e112784. [PMID: 25393740 PMCID: PMC4231100 DOI: 10.1371/journal.pone.0112784] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 10/14/2014] [Indexed: 11/19/2022] Open
Abstract
In response to hypoxia and other stress, the sympathetic (adrenergic) nervous system regulates arterial contractility and blood flow, partly through differential activities of the alpha1 (α1) - adrenergic receptor (AR) subtypes (α1A-, α1B-, and α1D-AR). Thus, we tested the hypothesis that with acclimatization to long-term hypoxia (LTH), contractility of middle cerebral arteries (MCA) is regulated by changes in expression and activation of the specific α1-AR subtypes. We conducted experiments in MCA from adult normoxic sheep maintained near sea level (300 m) and those exposed to LTH (110 days at 3801 m). Following acclimatization to LTH, ovine MCA showed a 20% reduction (n = 5; P<0.05) in the maximum tension achieved by 10-5 M phenylephrine (PHE). LTH-acclimatized cerebral arteries also demonstrated a statistically significant (P<0.05) inhibition of PHE-induced contractility in the presence of specific α1-AR subtype antagonists. Importantly, compared to normoxic vessels, there was significantly greater (P<0.05) α1B-AR subtype mRNA and protein levels in LTH acclimatized MCA. Also, our results demonstrate that extracellular regulated kinase 1 and 2 (ERK1/2)-mediated negative feedback regulation of PHE-induced contractility is modulated by α1B-AR subtype. Overall, in ovine MCA, LTH produces profound effects on α1-AR subtype expression and function.
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Affiliation(s)
- Ravi Goyal
- Center for Perinatal Biology, Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
- Epigenuity LLC, Loma Linda, California, United States of America
| | - Dipali Goyal
- Center for Perinatal Biology, Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
- Epigenuity LLC, Loma Linda, California, United States of America
| | - Nina Chu
- Center for Perinatal Biology, Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
- Epigenuity LLC, Loma Linda, California, United States of America
| | - Jonathan Van Wickle
- Center for Perinatal Biology, Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
- Epigenuity LLC, Loma Linda, California, United States of America
| | - Lawrence D. Longo
- Center for Perinatal Biology, Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, California, United States of America
- Epigenuity LLC, Loma Linda, California, United States of America
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26
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Zicha J, Behuliak M, Pintérová M, Bencze M, Kuneš J, Vaněčková I. The interaction of calcium entry and calcium sensitization in the control of vascular tone and blood pressure of normotensive and hypertensive rats. Physiol Res 2014; 63:S19-27. [PMID: 24564658 DOI: 10.33549/physiolres.932639] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Increased systemic vascular resistance is responsible for blood pressure (BP) elevation in most forms of human or experimental hypertension. The enhanced contractility of structurally remodeled resistance arterioles is mediated by enhanced calcium entry (through L type voltage-dependent calcium channels - L-VDCC) and/or augmented calcium sensitization (mediated by RhoA/Rho kinase pathway). It is rather difficult to evaluate separately the role of these two pathways in BP control because BP response to the blockade of either pathway is always dependent on the concomitant activity of the complementary pathway. Moreover, vasoconstrictor systems enhance the activity of both pathways, while vasodilators attenuate them. The basal fasudil-sensitive calcium sensitization determined in rats deprived of endogenous renin-angiotensin system (RAS) and sympathetic nervous system (SNS) in which calcium entry was dose-dependently increased by L-VDCC opener BAY K8644, is smaller in spontaneously hypertensive rats (SHR) than in normotensive Wistar-Kyoto (WKY) rats. In contrast, if endogenous RAS and SNS were present in intact rats, fasudil caused a greater BP fall in SHR than WKY rats. Our in vivo experiments indicated that the endogenous pressor systems (RAS and SNS) augment calcium sensitization mediated by RhoA/Rho kinase pathway, whereas the endogenous vasodilator systems (such as nitric oxide) attenuate this pathway. However, the modulation of calcium entry and calcium sensitization by nitric oxide is strain-dependent because NO deficiency significantly augments low calcium entry in WKY and low calcium sensitization in SHR. Further in vivo and in vitro experiments should clarify the interrelationships between endogenous vasoactive systems and the contribution of calcium entry and/or calcium sensitization to BP maintenance in various forms of experimental hypertension.
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Affiliation(s)
- J Zicha
- Department of Experimental Hypertension, Institute of Physiology Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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27
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Pedraza CE, Taylor C, Pereira A, Seng M, Tham CS, Izrael M, Webb M. Induction of oligodendrocyte differentiation and in vitro myelination by inhibition of rho-associated kinase. ASN Neuro 2014; 6:6/4/1759091414538134. [PMID: 25289646 PMCID: PMC4189421 DOI: 10.1177/1759091414538134] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In inflammatory demyelinating diseases such as multiple sclerosis (MS), myelin
degradation results in loss of axonal function and eventual axonal degeneration.
Differentiation of resident oligodendrocyte precursor cells (OPCs) leading to
remyelination of denuded axons occurs regularly in early stages of MS but halts as
the pathology transitions into progressive MS. Pharmacological potentiation of
endogenous OPC maturation and remyelination is now recognized as a promising
therapeutic approach for MS. In this study, we analyzed the effects of modulating the
Rho-A/Rho-associated kinase (ROCK) signaling pathway, by the use of selective
inhibitors of ROCK, on the transformation of OPCs into mature, myelinating
oligodendrocytes. Here we demonstrate, with the use of cellular cultures from rodent
and human origin, that ROCK inhibition in OPCs results in a significant generation of
branches and cell processes in early differentiation stages, followed by accelerated
production of myelin protein as an indication of advanced maturation. Furthermore,
inhibition of ROCK enhanced myelin formation in cocultures of human OPCs and neurons
and remyelination in rat cerebellar tissue explants previously demyelinated with
lysolecithin. Our findings indicate that by direct inhibition of this signaling
molecule, the OPC differentiation program is activated resulting in morphological and
functional cell maturation, myelin formation, and regeneration. Altogether, we show
evidence of modulation of the Rho-A/ROCK signaling pathway as a viable target for the
induction of remyelination in demyelinating pathologies.
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Affiliation(s)
- Carlos E Pedraza
- EMD Serono Research & Development Institute, Inc., Billerica, MA, USA
| | | | - Albertina Pereira
- EMD Serono Research & Development Institute, Inc., Billerica, MA, USA
| | - Michelle Seng
- EMD Serono Research & Development Institute, Inc., Billerica, MA, USA
| | - Chui-Se Tham
- EMD Serono Research & Development Institute, Inc., Billerica, MA, USA
| | | | - Michael Webb
- EMD Serono Research & Development Institute, Inc., Billerica, MA, USA
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Je HD, Kim HD, La HO. The Inhibitory Effect of Apigenin on the Agonist-Induced Regulation of Vascular Contractility via Calcium Desensitization-Related Pathways. Biomol Ther (Seoul) 2014; 22:100-5. [PMID: 24753814 PMCID: PMC3975479 DOI: 10.4062/biomolther.2014.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 02/28/2014] [Accepted: 03/06/2014] [Indexed: 01/21/2023] Open
Abstract
Apigenin, a natural flavonoid found in a variety of vegetables and fruits, has been shown to possess many biological functions. The present study was undertaken to investigate the influence of apigenin on vascular smooth muscle contractility and to determine the mechanism involved. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Apigenin significantly relaxed fluoride-, thromboxane A2 mimetic- or phorbol ester-induced vascular contraction, which suggests that apigenin could be an anti-hypertensive that reduces agonist-induced vascular contraction regardless of endothelial nitric oxide synthesis. Furthermore, apigenin significantly inhibited fluoride-induced increases in pMYPT1 levels and phorbol ester-induced increases in pERK1/2 levels, which suggests the mechanism involving the inhibition of Rho-kinase and MEK activity and the subsequent phosphorylation of MYPT1 and ERK1/2. This study provides evidence regarding the mechanism underlying the relaxation effect of apigenin on agonist-induced vascular contraction regardless of endothelial function.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongbuk 712-702, Republic of Korea
| | - Hyeong-Dong Kim
- Department of Physical Therapy, College of Health Science, Korea University, Seoul 336-871, Republic of Korea
| | - Hyen-Oh La
- Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul 137-701, Republic of Korea
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29
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Ellinsworth DC, Shukla N, Fleming I, Jeremy JY. Interactions between thromboxane A₂, thromboxane/prostaglandin (TP) receptors, and endothelium-derived hyperpolarization. Cardiovasc Res 2014; 102:9-16. [PMID: 24469536 DOI: 10.1093/cvr/cvu015] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Endothelium-dependent smooth muscle hyperpolarization (EDH) increasingly predominates over endothelium-derived nitric oxide (NO) as a participant in vasodilation as vessel size decreases. Its underlying nature is highly variable between vessel types, species, disease states, and exact experimental conditions, and is variably mediated by one or more transferable endothelium-derived hyperpolarizing factors and/or the electrotonic spread of endothelial hyperpolarization into the media via gap junctions. Although generally regarded (and studied) as a mechanism that is independent of NO and prostanoids, evidence has emerged that the endothelium-derived contracting factor and prostanoid thromboxane A2 can modulate several signalling components central to EDH, and therefore potentially curtail vasodilation through mechanisms that are distinct from those putatively involved in direct smooth muscle contraction. Notably, vascular production of thromboxane A2 is elevated in a number of cardiovascular disease states that promote endothelial dysfunction. This review will therefore discuss the mechanisms through which thromboxane A2 interacts with and modulates EDH, and will also consider the implications of such cross-talk in vasodilator control in health and disease.
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Affiliation(s)
- David C Ellinsworth
- Bristol Heart Institute, University of Bristol, Queens Building Level 7, Upper Maudlin St, Bristol Royal Infirmary, Upper Maudlin Street, Bristol BS2 8HW, UK
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Je HD, Kim HD, Jeong JH. The inhibitory effect of eupatilin on the agonist-induced regulation of vascular contractility. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2013; 17:31-6. [PMID: 23439928 PMCID: PMC3579102 DOI: 10.4196/kjpp.2013.17.1.31] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 01/10/2013] [Accepted: 01/19/2013] [Indexed: 11/22/2022]
Abstract
The present study was undertaken to investigate the influence of eupatilin on vascular smooth muscle contractility and to determine the mechanism involved. Denuded aortic rings from male rats were used and isometric contractions were recorded and combined with molecular experiments. Eupatilin more significantly relaxed fluoride-induced vascular contraction than thromboxane A2 or phorbol ester-induced contraction suggesting as a possible anti-hypertensive on the agonist-induced vascular contraction regardless of endothelial nitric oxide synthesis. Furthermore, eupatilin significantly inhibited fluoride-induced increases in pMYPT1 levels. On the other hand, it didn't significantly inhibit phorbol ester-induced increases in pERK1/2 levels suggesting the mechanism involving the primarily inhibition of Rho-kinase activity and the subsequent phosphorylation of MYPT1. This study provides evidence regarding the mechanism underlying the relaxation effect of eupatilin on agonist-induced vascular contraction regardless of endothelial function.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongbuk 712-702, Korea
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31
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Butler T, Paul J, Europe-Finner N, Smith R, Chan EC. Role of serine-threonine phosphoprotein phosphatases in smooth muscle contractility. Am J Physiol Cell Physiol 2013; 304:C485-504. [PMID: 23325405 DOI: 10.1152/ajpcell.00161.2012] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The degree of phosphorylation of myosin light chain 20 (MLC20) is a major determinant of force generation in smooth muscle. Myosin phosphatases (MPs) contain protein phosphatase (PP) 1 as catalytic subunits and are the major enzymes that dephosphorylate MLC20. MP regulatory targeting subunit 1 (MYPT1), the main regulatory subunit of MP in all smooth muscles, is a key convergence point of contractile and relaxatory pathways. Combinations of regulatory mechanisms, including isoform splicing, multiple phosphorylation sites, and scaffolding proteins, modulate MYPT1 activity with tissue and agonist specificities to affect contraction and relaxation. Other members of the PP1 family that do not target myosin, as well as PP2A and PP2B, dephosphorylate a range of proteins that affect smooth muscle contraction. This review discusses the role of phosphatases in smooth muscle contractility with a focus on MYPT1 in uterine smooth muscle. Myometrium shares characteristics of vascular and other visceral smooth muscles yet, during healthy pregnancy, undergoes hypertrophy, hyperplasia, quiescence, and labor as physiological processes. Myometrium presents an accessible model for the study of normal and pathological smooth muscle function, and a better understanding of myometrial physiology may allow the development of novel therapeutics for the many disorders of myometrial physiology from preterm labor to dysmenorrhea.
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Affiliation(s)
- Trent Butler
- Mothers and Babies Research Centre, Faculty of Health, University of Newcastle, Callaghan, NSW 2308, Australia
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Soliman H, Gador A, Lu YH, Lin G, Bankar G, MacLeod KM. Diabetes-induced increased oxidative stress in cardiomyocytes is sustained by a positive feedback loop involving Rho kinase and PKCβ2. Am J Physiol Heart Circ Physiol 2012; 303:H989-H1000. [PMID: 22865386 DOI: 10.1152/ajpheart.00416.2012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We previously reported that acute inhibition of the RhoA/Rho kinase (ROCK) pathway normalized contractile function of diabetic rat hearts, but the underlying mechanism is unclear. Protein kinase C (PKC) β(2) has been proposed to play a major role in diabetic cardiomyopathy at least in part by increasing oxidative stress. Further evidence suggests that PKC positively regulates RhoA expression through induction of inducible nitric oxide synthase (iNOS) in diabetes. However, in preliminary studies, we found that inhibition of ROCK itself reduced RhoA expression in diabetic hearts. We hypothesized that there is an interaction between RhoA/ROCK and PKCβ(2) in the form of a positive feedback loop that sustains their activation and the production of reactive oxygen species (ROS). This was investigated in cardiomyocytes isolated from diabetic and control rat hearts, incubated with or without cytochalasin D or inhibitors of ROCK, RhoA, PKCβ(2), or iNOS. Inhibition of RhoA and ROCK markedly attenuated the diabetes-induced increases in PKCβ(2) activity and iNOS and RhoA expression in diabetic cardiomyocytes, while having no effect in control cells. Inhibition of PKCβ(2) and iNOS also normalized RhoA expression and ROCK overactivation, whereas iNOS inhibition reversed the increase in PKCβ(2) activity. Each of these treatments also normalized the diabetes-induced increase in production of ROS. Actin cytoskeleton disruption attenuated the increased expression and/or activity of all of these targets in diabetic cardiomyocytes. These data suggest that, in the diabetic heart, the RhoA/ROCK pathway contributes to contractile dysfunction at least in part by sustaining PKCβ(2) activation and ROS production via a positive feedback loop that requires an intact cytoskeleton.
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Affiliation(s)
- Hesham Soliman
- Molecular and Cellular Pharmacology Research Group, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z3
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Je HD, Kim HD, Park JH. Controversial effect of ethanol irrespective of kinases inhibition on the agonist-dependant vasoconstriction. Biomol Ther (Seoul) 2012; 20:352-6. [PMID: 24130935 PMCID: PMC3794535 DOI: 10.4062/biomolther.2012.20.3.352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 05/01/2012] [Accepted: 05/03/2012] [Indexed: 11/20/2022] Open
Abstract
The present study was undertaken to determine whether ethanol influences on the agonist-induced vascular smooth muscle contraction and, if so, to investigate the related mechanism. The measurement of isometric contractions using a computerized data acquisition system was combined with molecular experiments. Ethanol significantly inhibited thromboxane A2 mimetic-induced contraction with intact endothelial function, but there was no relaxation on thromboxane A2 mimetic U-46619-induced contraction irrespective of endothelium suggesting that the pathway such as Rho-kinase activation, Ca2+ entry or thin filament regulation was not affected. In addition, ethanol didn’t decrease thromboxane A2 mimetic-induced increase of phospho-myosin phosphatase targeting subunit protein 1 (pMYPT1) or pERK1/2. Interestingly, ethanol didn’t inhibit significantly phorbol ester-induced contraction in denuded muscles suggesting that thin filament regulation is less important on the ethanol-induced regulation in the muscle than endothelial NO synthesis. In conclusion, this study provides the evidence and possible related mechanism concerning the effect of ethanol on the agonist-dependent contraction in rat aortic rings with regard to endothelial function.
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Affiliation(s)
- Hyun Dong Je
- Department of Pharmacology, College of Pharmacy, Catholic University of Daegu, Gyeongsan 712-702
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Fediuk J, Gutsol A, Nolette N, Dakshinamurti S. Thromboxane-induced actin polymerization in hypoxic pulmonary artery is independent of Rho. Am J Physiol Lung Cell Mol Physiol 2012; 302:L13-26. [DOI: 10.1152/ajplung.00016.2011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Actin polymerization (APM), regulated by Rho GTPases, promotes myocyte force generation. Hypoxia is known to impede postnatal disassembly of the actin cytoskeleton in pulmonary arterial (PA) myocytes. We compared basal and agonist-induced APM in myocytes from PA and descending aorta (Ao), under hypoxic and normoxic conditions. We also examined effects of thromboxane challenge on force generation and cytoskeletal assembly in resistance PA and renal arteries from neonatal swine with persistent pulmonary hypertension (PPHN) induced by 72-h normobaric hypoxia, compared with age-matched controls. Synthetic and contractile phenotype myocytes from neonatal porcine PA or Ao were grown in hypoxia (10% O2) or normoxia (21% O2) for 7 days, then challenged with 10−6 M thromboxane mimetic U46619. F/G actin ratio was quantified by laser-scanning cytometry and by cytoskeletal fractionation. Thromboxane receptor (TP) G protein coupling was measured by immunoprecipitation and probing for Gαq, G12, or G13, RhoA activation by Rhotekin-RBD affinity precipitation, and LIM kinase (LIMK) and cofilin phosphorylation by Western blot. Isometric force to serial concentrations of U46619 was measured in muscular pulmonary and renal arteries from PPHN and control swine; APM was quantified in fixed contracted vessels. Contractile PA myocytes exhibit marked Rho-dependent APM in hypoxia, with increased active RhoA and LIMK phosphorylation. Their additional APM response to U46619 challenge is independent of RhoA, reflecting decreased TP association with G12/13 in favor of Gαq. In contrast, hypoxic contractile Ao myocytes polymerize actin modestly and depolymerize to U46619. Both basal APM and the APM response to U46619 are increased in PPHN PA. APM corresponds with increased force generation to U46619 challenge in PPHN PA but not renal arteries.
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Affiliation(s)
- Jena Fediuk
- Departments of 1Physiology and
- Biology of Breathing Group, Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada
| | - Alexey Gutsol
- Biology of Breathing Group, Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada
| | - Nora Nolette
- Biology of Breathing Group, Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada
| | - Shyamala Dakshinamurti
- Departments of 1Physiology and
- Pediatrics, University of Manitoba
- Biology of Breathing Group, Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada
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Je HD, Jeong JH, La HO. The Inhibitory Effect of Quercetin on the Agonist-Induced Regulation of Vascular Contractility. Biomol Ther (Seoul) 2011. [DOI: 10.4062/biomolther.2011.19.4.460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Borysova L, Shabir S, Walsh MP, Burdyga T. The importance of Rho-associated kinase-induced Ca2+ sensitization as a component of electromechanical and pharmacomechanical coupling in rat ureteric smooth muscle. Cell Calcium 2011; 50:393-405. [PMID: 21839512 DOI: 10.1016/j.ceca.2011.07.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/05/2011] [Accepted: 07/07/2011] [Indexed: 01/30/2023]
Abstract
Ureteric peristalsis, which occurs via alternating contraction and relaxation of ureteric smooth muscle, ensures the unidirectional flow of urine from the kidney to the bladder. Understanding of the molecular mechanisms underlying ureteric excitation-contraction coupling, however, is limited. To address these knowledge deficits, and in particular to test the hypothesis that Ca2+ sensitization via activation of the RhoA/Rho-associated kinase (ROK) pathway plays an important role in ureteric smooth muscle contraction, we carried out a thorough characterization of the electrical activity, Ca2+ signaling, MYPT1 (myosin targeting subunit of myosin light chain phosphatase, MLCP) and myosin regulatory light chain (LC20) phosphorylation, and force responses to membrane depolarization induced by KCl (electromechanical coupling) and carbachol (CCh) (pharmacomechanical coupling). The effects of ROK inhibition on these parameters were investigated. We conclude that the tonic, but not the phasic component of KCl- or CCh-induced ureteric smooth muscle contraction is highly dependent on ROK-catalyzed phosphorylation of MYPT1 at T855, leading to inhibition of MLCP and increased LC20 phosphorylation.
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Affiliation(s)
- Lyudmyla Borysova
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, University of Liverpool, Crown Street, Liverpool L69 3BX, UK
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Seok YM, Cho HJ, Cha BY, Woo JT, Kim IK. Honokiol attenuates vascular contraction through the inhibition of the RhoA/Rho-kinase signalling pathway in rat aortic rings. J Pharm Pharmacol 2011; 63:1244-51. [DOI: 10.1111/j.2042-7158.2011.01332.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Abstract
Objectives
Honokiol is a small-molecule polyphenol isolated from the species Magnolia obovata. We hypothesized that honokiol attenuated vascular contractions through the inhibition of the RhoA/Rho-kinase signalling pathway.
Methods
Rat aortic rings were denuded of endothelium, mounted in organ baths, and subjected to contraction or relaxation. Phosphorylation of 20 kDa myosin light chains (MLC20), myosin phosphatase targeting subunit 1 (MYPT1) and protein kinase C (PKC)-potentiated inhibitory protein for heterotrimeric myosin light chain phosphatase (MLCP) of 17 kDa (CPI17) were examined by immunoblot. We also measured the amount of guanosine triphosphate RhoA as a marker for RhoA activation.
Key findings
Pretreatment with honokiol dose-dependently inhibited the concentration–response curves in response to sodium fluoride (NaF) or thromboxane A2 agonist U46619. Honokiol decreased the phosphorylation levels of MLC20, MYPT1Thr855 and CPI17Thr38 as well as the activation of RhoA induced by 8.0 mm NaF or 30 nm U46619.
Conclusions
These results demonstrated that honokiol attenuated vascular contraction through the inhibition of the RhoA/Rho-kinase signalling pathway.
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Affiliation(s)
- Young Mi Seok
- Cardiovascular Research Institute, Republic of Korea
| | | | - Byung-Yoon Cha
- Department of Biological Chemistry and Research Institute for Biological Functions, Chubu University, Kasugai, Aichi, Japan
| | - Je-Tae Woo
- Department of Biological Chemistry and Research Institute for Biological Functions, Chubu University, Kasugai, Aichi, Japan
- Department of Nutriproteomics, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - In Kyeom Kim
- Cardiovascular Research Institute, Republic of Korea
- Department of Pharmacology, Republic of Korea
- CMRI, Kyungpook National University School of Medicine, Daegu, Republic of Korea
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Role of myosin light chain kinase and myosin light chain phosphatase in the resistance arterial myogenic response to intravascular pressure. Arch Biochem Biophys 2011; 510:160-73. [DOI: 10.1016/j.abb.2011.02.024] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 02/24/2011] [Accepted: 02/28/2011] [Indexed: 12/19/2022]
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Khanna V, Jain M, Barthwal MK, Kalita D, Boruah JJ, Das SP, Islam NS, Ramasarma T, Dikshit M. Vasomodulatory effect of novel peroxovanadate compounds on rat aorta: Role of rho kinase and nitric oxide/cGMP pathway. Pharmacol Res 2011; 64:274-82. [PMID: 21497197 DOI: 10.1016/j.phrs.2011.03.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 03/30/2011] [Accepted: 03/30/2011] [Indexed: 12/01/2022]
Abstract
The present study was undertaken to assess the role of reactive oxygen species (ROS) in rat aortic ring vasoreactivity and integrity by using various peroxovanadate (pV) compounds. All the pV compounds (1nM-300 μM) used in the present study exerted concentration-dependent contractions on endothelium intact rat aortic rings. All compounds with an exception of DPV-asparagine (DPV-asn) significantly altered vascular integrity as shown by diminished KCl responses. Phenylephrine (PE)-mediated contractions (3nM-300 μM) were unaltered in the presence of these compounds. Acetylcholine (Ach)-mediated relaxation in PE (1μM) pre-contracted rings was significantly reduced in presence of diperoxovanadate (DPV), poly (sodium styrene sulfonate-co-maleate)-pV (PSS-CoM-pV) and poly (sodium styrene 4-sulfonate)-pV (PSS-pV). However, no significant change in Ach-mediated responses was observed in the presence of poly (acrylate)-pV (PAA-pV) and DPV-asn. DPV-asn was thus chosen to further elucidate mechanism involved in peroxide mediated modulation of vasoreactivity. DPV-asn (30nM - 300 μM) exerted significantly more stable contractions, that was found to be catalase (100U/ml) resistant in comparison with H(2)O(2) (30nM-300 μM) in endothelium intact aortic rings. These contractile responses were found to be dependent on extracellular Ca(2+) and were significantly inhibited in presence of ROS scavenger N-acetylcysteine (100 μM). Intracellular calcium chelation by BAPTA-AM (10μM) had no significant effect on DPV-asn (30nM-300 μM) mediated contraction. Pretreatment of aortic rings by rho-kinase inhibitor Y-27632 (10μM) significantly inhibited DPV-asn-mediated vasoconstriction indicating role of voltage-dependent Ca(2+) influx and downstream activation of rho-kinase. The small initial relaxant effect obtained on addition of DPV-asn (30nM-1 μM) in PE (1 μM) pre-contracted endothelium intact rings, was prevented in the presence of guanylate cyclase inhibitor, methylene blue (10 μM) and/or nitric oxide synthase (NOS) inhibitor, l-NAME (100 μM) suggesting involvement of nitric oxide and cGMP. DPV-asn, like H(2)O(2), exerted a response of vasoconstriction in normal arteries and vasodilation at low concentrations (30nM-1 μM) in PE-pre contracted rings with overlapping mechanisms. These findings suggest usefulness of DPV-asn having low toxicity, in exploring the peroxide-mediated effects on various vascular beds. The present study also convincingly demonstrates role of H(2)O(2) in the modulation of vasoreactivity by using stable peroxide DPV-asn and warrants future studies on peroxide mediated signaling from a newer perspective.
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Affiliation(s)
- Vivek Khanna
- Pharmacology Division, Central Drug Research Institute (CSIR), Chattar Manzil Palace, M G Marg, Lucknow 226 001, India
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Abe K, Toba M, Alzoubi A, Koubsky K, Ito M, Ota H, Gairhe S, Gerthoffer WT, Fagan KA, McMurtry IF, Oka M. Tyrosine kinase inhibitors are potent acute pulmonary vasodilators in rats. Am J Respir Cell Mol Biol 2011; 45:804-8. [PMID: 21378262 DOI: 10.1165/rcmb.2010-0371oc] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Tyrosine kinase inhibitors are promising for the treatment of severe pulmonary hypertension. Their therapeutic effects are postulated to be due to inhibition of cell growth-related kinases and attenuation of vascular remodeling. Their potential vasodilatory activities have not been explored. Vasorelaxant effects of the tyrosine kinase inhibitors imatinib, sorafenib, and nilotinib were examined in isolated pulmonary arterial rings from normal and pulmonary hypertensive rats. Phosphorylation of myosin light chain phosphatase and myosin light chain was assessed by Western blots. Acute hemodynamic effects of imatinib were tested in the pulmonary hypertensive rats. In normal pulmonary arteries, imatinib reversed serotonin- and U46619-induced contractions in a concentration-dependent and endothelium-independent manner. Sorafenib and nilotinib relaxed U46619-induced contraction. Imatinib inhibited activation of myosin phosphatase induced by U46619 in normal pulmonary arteries. All three tyrosine kinase inhibitors concentration-dependently and completely reversed the spontaneous contraction of hypertensive pulmonary arterial rings unmasked by inhibition of nitric oxide synthase. Acute intravenous administration of imatinib reduced high right ventricular systolic pressure in pulmonary hypertensive rats, with little effect on left ventricular systolic pressure and cardiac output. We conclude that tyrosine kinase inhibitors have potent pulmonary vasodilatory activity, which could contribute to their long-term beneficial effect against pulmonary hypertension. Vascular smooth muscle relaxation mediated via activation of myosin light chain phosphatase (Ca(2+) desensitization) appears to play a role in the imatinib-induced pulmonary vasodilation.
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Affiliation(s)
- Kohtaro Abe
- Department of Pharmacology, University of South Alabama, Mobile, Alabama, USA
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Endocytosis of cationized ferritin in marginal cells of the stria vascularis is regulated by protein kinase, protein phosphatase, and MEK/ERK and PI3-K signaling pathways. Otol Neurotol 2011; 32:856-62. [PMID: 21358558 DOI: 10.1097/mao.0b013e318210b8ad] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS The endocytosis of cationized ferritin (CF) via a clathrin-mediated pathway is regulated by a signaling network. BACKGROUND Marginal cells showed the active endocytosis of CF via a clathrin-mediated pathway. The internalization of receptors through the clathrin-mediated pathway is an important regulatory event in signal transduction. Numerous kinases are involved in endocytosis, and each endocytic route is subjected to high-order regulation by cellular signaling mechanisms. METHODS CF was infused into the cochlear duct with phorbol 12-myristate 13 acetate, okadaic acid, staurosporin, phenylarsine oxide, PD98059, SB20580 and wortmannin. Endocytic activity was measured at 30 minutes post-infusion by transmission electron microscopy. RESULTS The endocytosis of CF was stimulated by a protein kinase C activator (phorbol 12-myristate 13 acetate) and a protein kinase A activator (8-bromoadenosine-3', 5'-cyclic monophosphate). It was inhibited by protein phosphatase inhibitors (okadaic acid and phenylarsine oxide), mitogen-activated protein kinase/extracellular signal-related kinase inhibitors (PD98059 and SB20580), and a phosphatidylinositol 3-kinase inhibitor (wortmannin). CONCLUSION Our previous study showed the endocytosis of microperoxidase to be strongly dependent on protein kinase C, protein phosphatase, extracellular signal-related kinase, and phosphatidylinositol 3-kinase signaling networks but not on protein kinase A and mitogen-activated protein kinase signaling networks. The present study indicated that the signaling cascade regulating CF's internalization differed from the cascade for microperoxidase's endocytosis.
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Seok YM, Jin F, Shin HM, Sung SH, Sohn UD, Cho JY, Kim IK. HMC05 attenuates vascular contraction through inhibition of RhoA/Rho-kinase signaling pathway. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:484-489. [PMID: 20965238 DOI: 10.1016/j.jep.2010.10.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Revised: 08/13/2010] [Accepted: 10/08/2010] [Indexed: 05/30/2023]
Abstract
AIM OF THE STUDY HMC05, an extract from eight different herbal mixtures, has been developed to treat cardiovascular disease. This extract has a vasorelaxant and anti-atherosclerotic action. We hypothesized that HMC05 attenuates vascular contraction through inhibition of the RhoA/Rho-kinase signaling pathway. MATERIALS AND METHODS Rat aortic ring preparations were mounted in organ baths and subjected to contraction and relaxation. Phosphorylation of 20 kDa myosin light chains (MLC(20)) and myosin phosphatase targeting subunit 1 (MYPT1) were examined by immunoblot. We also measured the amount of GTP RhoA as a marker for RhoA activation. RESULTS In endothelium-denuded aortic ring preparations, HMC05 relaxed vascular contraction induced by 6.0 mM NaF, 100 nM phenylephrine, 30 nM thromboxane A(2) agonist U46619 or 1.0 μM protein kinase C (PKC) activator phorbol-12,13-dibutyrate (PDBu) in a decreasing order. HMC05 relaxed aortic ring preparations precontracted with sodium fluoride (NaF) whether endothelium was intact or denuded. Pre-incubation with HMC05 for 30 min dose-dependently inhibited the NaF-induced contractile response. In vascular strips, HMC05 decreased the phosphorylation level of both MLC(20) and MYPT1(Thr855) induced by 6.0 mM NaF. Furthermore, HMC05 decreased the amount of GTP RhoA activated by NaF. CONCLUSIONS HMC05 attenuates vascular contraction through inhibition of the RhoA/Rho-kinase signaling pathway. HMC05 may be useful for the treatment and/or prevention of cardiovascular diseases associated with activation of RhoA/Rho-kinase signaling pathway.
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Affiliation(s)
- Young Mi Seok
- Department of Pharmacology, Kyungpook National University School of Medicine, Daegu 700-422, Republic of Korea
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Seok YM, Choi YW, Kim GD, Kim HY, Takuwa Y, Kim IK. Effects of gomisin A on vascular contraction in rat aortic rings. Naunyn Schmiedebergs Arch Pharmacol 2010; 383:45-56. [DOI: 10.1007/s00210-010-0571-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 09/08/2010] [Indexed: 01/06/2023]
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Je HD, Lee JM, La HO. The Inhibitory Effect of Eupatilin on the Intestinal Contraction Induced by Carbachol. Biomol Ther (Seoul) 2010. [DOI: 10.4062/biomolther.2010.18.4.442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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45
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Jantschak F, Popp AM, Hofmann RA, Villalón CM, Centurión D, Pertz HH. Postjunctional α2C-adrenoceptors mediate vasoconstriction in rat tail artery: influence of precontraction and temperature on vasoreactivity. Naunyn Schmiedebergs Arch Pharmacol 2010; 382:487-97. [DOI: 10.1007/s00210-010-0564-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Accepted: 09/06/2010] [Indexed: 10/19/2022]
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Tsai MH, Jiang MJ. Reactive oxygen species are involved in regulating alpha1-adrenoceptor-activated vascular smooth muscle contraction. J Biomed Sci 2010; 17:67. [PMID: 20727219 PMCID: PMC2931462 DOI: 10.1186/1423-0127-17-67] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 08/23/2010] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Reactive oxygen species (ROS) were shown to mediate aberrant contractility in hypertension, yet the physiological roles of ROS in vascular smooth muscle contraction have remained elusive. This study aimed to examine whether ROS regulate alpha1-adrenoceptor-activated contraction by altering myosin phosphatase activities. METHODS Using endothelium-denuded rat tail artery (RTA) strips, effects of anti-oxidants on isometric force, ROS production, phosphorylation of the 20-kDa myosin light chain (MLC20), and myosin phosphatase stimulated by alpha1-adrenoceptor agonist phenylephrine were examined. RESULTS An antioxidant, N-acetyl-L-cysteine (NAC), and two NADPH oxidase inhibitors, apocynin and VAS2870, dose-dependently inhibited contraction activated by phenylephrine. Phenylephrine stimulated superoxide anion production that was diminished by the pretreatment of apocynin, VAS2870, superoxide scavenger tiron or mitochondria inhibitor rotenone, but not by xanthine oxidase inhibitor allopurinol or cyclooxygenase inhibitor indomethacin. Concurrently, NADPH oxidase activity in RTA homogenates increased within 1 min upon phenylephrine stimulation, sustained for 10 min, and was abolished by the co-treatment with apocynin, but not allopurinol or rotenone. Phenylephrine-induced MLC20 phosphorylation was dose-dependently decreased by apocynin. Furthermore, apocynin inhibited phenylephrine-stimulated RhoA translocation to plasma membrane and phosphorylation of both myosin phosphatase regulatory subunit MYPT1Thr855 and myosin phosphatase inhibitor CPI-17Thr38. CONCLUSIONS ROS, probably derived from NADPH oxidase and mitochondria, partially regulate alpha1-adrenoceptor-activated smooth muscle contraction by altering myosin phosphatase-mediated MLC20 phosphorylation through both RhoA/Rho kinase- and CPI-17-dependent pathways.
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Affiliation(s)
- Ming-Ho Tsai
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan
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Song MJ, Baek I, Jeon SB, Seo M, Kim YH, Cui S, Jeong YS, Lee IJ, Shin DH, Hwang YH, Kim IK. Effects of glyceollin I on vascular contraction in rat aorta. Naunyn Schmiedebergs Arch Pharmacol 2010; 381:517-28. [DOI: 10.1007/s00210-010-0513-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2009] [Accepted: 03/08/2010] [Indexed: 12/15/2022]
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El-Yazbi AF, Johnson RP, Walsh EJ, Takeya K, Walsh MP, Cole WC. Pressure-dependent contribution of Rho kinase-mediated calcium sensitization in serotonin-evoked vasoconstriction of rat cerebral arteries. J Physiol 2010; 588:1747-62. [PMID: 20351047 DOI: 10.1113/jphysiol.2010.187146] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Our understanding of the cellular signalling mechanisms contributing to agonist-induced constriction is almost exclusively based on the study of conduit arteries. Resistance arteries/arterioles have received less attention as standard biochemical approaches lack the necessary sensitivity to permit quantification of phosphoprotein levels in these small vessels. Here, we have employed a novel, highly sensitive Western blotting method to assess: (1) the contribution of Ca(2+) sensitization mediated by phosphorylation of myosin light chain phosphatase targeting subunit 1 (MYPT1) and the 17 kDa PKC-potentiated protein phosphatase 1 inhibitor protein (CPI-17) to serotonin (5-HT)-induced constriction of rat middle cerebral arteries, and (2) whether there is any interplay between pressure-induced myogenic and agonist-induced mechanisms of vasoconstriction. Arterial diameter and levels of MYPT1 (T697 and T855), CPI-17 and 20 kDa myosin light chain subunit (LC(20)) phosphorylation were determined following treatment with 5-HT (1 micromol l(1)) at 10 or 60 mmHg in the absence and presence of H1152 or GF109203X to suppress the activity of Rho-associated kinase (ROK) and protein kinase C (PKC), respectively. Although H1152 and GF109203X suppressed 5-HT-induced constriction and reduced phospho-LC(20) content at 10 mmHg, we failed to detect any increase in MYPT1 or CPI-17 phosphorylation. In contrast, an increase in MYPT1-T697 and MYPT1-T855 phosphorylation, but not phospho-CPI-17 content, was apparent at 60 mmHg following exposure to 5-HT, and the phosphorylation of both MYPT1 sites was sensitive to H1152 inhibition of ROK. The involvement of MYPT1 phosphorylation in the response to 5-HT at 60 mmHg was not dependent on force generation per se, as inhibition of cross-bridge cycling with blebbistatin (10 micromol l(1)) did not affect phosphoprotein content. Taken together, the data indicate that Ca(2+) sensitization owing to ROK-mediated phosphorylation of MYPT1 contributes to 5-HT-evoked vasoconstriction only in the presence of pressure-induced myogenic activation. These findings provide novel evidence of an interplay between myogenic- and agonist-induced vasoconstriction in cerebral resistance arteries.
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Affiliation(s)
- Ahmed F El-Yazbi
- The Smooth Muscle Research Group, Department of Physiology and Pharmacology, Faculty of Medicine, University of Calgary, 3330 Hospital Drive N.W., Calgary, Alberta, Canada T2N 4N1
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Ziolkowski N, Grover AK. Functional linkage as a direction for studies in oxidative stress: α-adrenergic receptorsThis review is one of a selection of papers published in a Special Issue on Oxidative Stress in Health and Disease. Can J Physiol Pharmacol 2010; 88:220-32. [PMID: 20393587 DOI: 10.1139/y10-013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The α-adrenergic receptors (adrenoceptors) are activated by the endogenous agonists epinephrine and norepinephrine. They are G protein-coupled receptors that may be broadly classified into α1 (subclasses α1A, α1B, α1D) and α2 (subclasses α2A, α2B, α2C). The α1-adrenoceptors act by binding to Gαq subunits of the G proteins, causing activation of phospholipase C (PLC). PLC converts phosphatidylinositol 4,5-bisphosphate into inositol trisphosphate (IP3) and diacylglycerol (DAG), which have downstream effects on cytosolic Ca2+ concentration. The α2-adrenoceptors bind to Gαi thus inhibiting adenylyl cyclase and decreasing cAMP levels. DAG alters protein kinase C activity and cAMP activates protein kinase A. The downstream pathways of the two receptors may also interact. Activation of α1- and α2-adrenoceptors in vascular smooth muscle results in vasoconstriction. However, the densities of individual receptor subclasses vary between vessel beds or between vessels of various sizes within the same bed. In vasculature, the densities of adrenoceptor subclasses differ between conduit arteries and arterioles. These differences, along with differences in coupling mechanisms, allow for fine regulation of arterial blood flow. This diversity is enhanced by interactions resulting from homo- and heterodimer formation of the receptors, metabolic pathways, and kinases. Reactive oxygen species generated in pathologies may alter α1- and α2-adrenoceptor cascades, change vascular contractility, or cause remodeling of blood vessels. This review emphasizes the need for understanding the functional linkage between α-adrenoceptor subtypes, coupling, cross talk, and oxidative stress in cardiovascular pathologies.
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Affiliation(s)
- Natalia Ziolkowski
- Departments of Medicine and Biology, McMaster University, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada
| | - Ashok K. Grover
- Departments of Medicine and Biology, McMaster University, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada
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Denniss SG, Jeffery AJ, Rush JWE. RhoA-Rho kinase signaling mediates endothelium- and endoperoxide-dependent contractile activities characteristic of hypertensive vascular dysfunction. Am J Physiol Heart Circ Physiol 2010; 298:H1391-405. [PMID: 20154258 DOI: 10.1152/ajpheart.01233.2009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hypertensive vasomotor dysfunction is defined by endothelium-dependent contractions involving prostaglandins and ROS. Since both thromboxane-prostanoid receptor (TPr) signaling and ROS activate RhoA-Rho kinase (ROCK) in vascular smooth muscle (VSM) preparations, we hypothesized that enhanced endothelium-dependent contraction in the common carotid artery (CCA) of spontaneously hypertensive rats (SHRs) is ROCK mediated. ACh-stimulated contractions were approximately twofold greater in SHRs versus normotensive Wistar-Kyoto (WKY) rats, abolished by endothelial denudation or cyclooxygenase (COX)-1 inhibition, and nearly eliminated by TPr blockade. RhoA but not ROCK-II protein expression was increased ( approximately 50%) in the SHR CCA. Inhibition of ROCK, but not protein kinase C, caused a dose-dependent reduction in endothelium-dependent contractions to ACh across strains, with the highest dose mirroring the effect of high-dose TPr antagonism. Conversely, ROCK inhibition caused dose-dependent and endothelium- and nitric oxide-independent relaxation in CCAs precontracted with the TPr agonist U-46619. Prostacyclin was the predominant prostaglandin produced by ACh-stimulated CCAs, with greater than twofold more prostacyclin released from SHR versus WKY rats, and its production was unaffected by ROCK inhibition. RhoA activation was approximately twofold higher in quiescent SHR CCAs compared with those from WKY rats and was significantly increased by ACh stimulation. Augmentation of chemical superoxide quenching with tiron or inhibition of the NADPH oxidase-derived superoxide-producing pathway with apocynin reduced ACh-stimulated contractile activity in SHR more than in WKY rats, whereas the SOD mimetic tempol amplified the response. Exposure of CCAs to exogenous H(2)O(2) caused contractions, similar to ACh stimulation, that were greater in SHR than in WKY rats, abolished by COX-1 inhibition, and highly attenuated by TPr blockade or ROCK inhibition. These results indicate that RhoA-ROCK may act as a molecular switch, transducing signals from endothelium-derived prostaglandin(s) and ROS, which are overproduced in SHR CCAs, to "turn on" VSM contractile pathways, thus mediating the enhanced endothelium- and endoperoxide-dependent vascular contractions characteristic of hypertension, among other cardiovascular disease states, such as diabetes and aging.
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Affiliation(s)
- Steven G Denniss
- Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
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