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The effect of activated κ-opioid receptor (κ-OR) on the role of calcium sensing receptor (CaSR) in preventing hypoxic pulmonary hypertension development. Biomed Pharmacother 2020; 125:109931. [PMID: 32066040 DOI: 10.1016/j.biopha.2020.109931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 12/10/2019] [Accepted: 12/15/2019] [Indexed: 12/22/2022] Open
Abstract
κ-opioid receptor (κ-OR) plays a key role in preventing hypoxic pulmonary hypertension (HPH) development after activated by exogenous agonist U50,488H. Calcium sensing receptor (CaSR) activation induces HPH by promoting vasoconstriction and vascular remodeling. The activated κ-OR is reported to inhibit the expression of CaSR in pulmonary artery smooth muscle cells (PASMCs). Thus, in this study, we aimed to explore the effect of activated κ-OR on the role of CaSR in preventing HPH development. An HPH rat model was constructed using Sprague-Dawley rats. Changes in mean pulmonary arterial pressure (mPAP) and right ventricular pressure (RVP) mediated by κ-OR agonist U50,488H and CaSR inhibitor NPS2143 were observed. The effects of CaSR agonist spermine and inhibitor NPS2143 on pulmonary artery tension were tested. The expression and localization of κ-OR and CaSR were measured in isolated PASMCs. A cell-counting kit-8 assay was performed to evaluate the effect of spermine in PASMC proliferation. Expression of proliferating cell nuclear antigen (PCNA), Erk, and p-Erk was evaluated by western blot analysis. Results showed that κ-OR and CaSR were co-expressed and colocalized in PASMCs under normoxic and hypoxic conditions. Interactions between κ-OR and CaSR were also observed. Spermine improved vasoconstriction in the pulmonary artery in HPH rats, which was abolished by U50,488H. RVP and mPAP were significantly increased in HPH rats under CaSR stimulation, but were significantly reduced when the rats were pretreated with U50,488H and NPS2143 (P < 0.01). Spermine treatment significantly promoted PASMC proliferation, which was significantly inhibited by U50,488H, p38 inhibitor SB203580, JNK inhibitor SP600125, Erk inhibitor SCH772984, and MEK inhibitor U0126, especially Erk inhibitor (P < 0.01). Spermine significantly increased PCNA and P-Erk expression in hypoxic conditions, which was inhibited by U50,488H and NPS2143. κ-OR stimulation prevented HPH development via the CaSR/MAPK signaling pathway.
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Zhou Y, Tian X, Wang X, Wang Y, Fan R, Wang Y, Feng N, Zhang S, Guo H, Gu X, Jia M, Yin W, Hou Z, Li J, Pei J. Quaternary ammonium salt of U50,488H elicits protective effects against hypoxic pulmonary hypertension. Eur J Pharmacol 2018; 832:129-137. [PMID: 29782857 DOI: 10.1016/j.ejphar.2018.05.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 05/17/2018] [Accepted: 05/17/2018] [Indexed: 12/01/2022]
Abstract
The present study aimed to investigate the role of quaternary ammonium salt of U50,488H (Q-U50,488H) in hypoxic pulmonary hypertension (HPH) and underlying mechanisms involved. A HPH animal model was established in rats under hypoxia and the mean pulmonary arterial pressure (mPAP) and right ventricular pressure (RVP) were measured. Relaxation of the pulmonary artery in response to Q-U50,488H was determined. In addition, expression and activity of endothelial nitric oxide (NO) synthase (eNOS) and inducible NO synthase (iNOS) with NO content, Akt expression, total antioxidant capacity (T-AOC), and gp91phox were evaluated. Cell viability was determined by the cell counting kit-8 (CCK-8) assay. We demonstrated that both the molecular weight and solubility of Q-U50,488H were higher than that of U50,488H. Q-U50,488H reduced mPAP and RVP and prevented the development of HPH. Moreover, Q-U50,488H relaxed the pulmonary arteries from both normal and HPH rats in a time-dependent manner. Under hypoxic conditions, Q-U50,488H significantly increased Akt phosphorylation, eNOS phosphorylation, NO content in serum, and T-AOC in pulmonary arteries of HPH rats. In addition, the activity of eNOS was elevated, but the activity of iNOS was reduced when Q-U50,488H was given under hypoxia. Q-U50,488H significantly counteracted the increase of gp91phox expression in pulmonary arteries under hypoxia. In addition, in vitro studies suggested that Q-U50,488H inhibited pulmonary artery smooth muscle cells (PASMCs) proliferation under hypoxic conditions and that the effects of Q-U50,488H were blocked by nor-binaltorphimine (nor-BNI). Thus, our results provided evidence that Q-U50,488H plays a protective role against HPH via κ-opioid receptor stimulation.
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Affiliation(s)
- Yaguang Zhou
- Departemnt of Emergency, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China; Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Xin Tian
- Departemnt of Emergency, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China; Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China; Department of Cardiology, Traditional Chinese Medicine Hospital of Shaanxi Province, Xi'an, Shaanxi Province, China
| | - Xueying Wang
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Yuanbo Wang
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Rong Fan
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Yuemin Wang
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Na Feng
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Shumiao Zhang
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Haitao Guo
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Xiaoming Gu
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Min Jia
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Wen Yin
- Departemnt of Emergency, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Zuoxu Hou
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Juan Li
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China.
| | - Jianming Pei
- Departemnt of Emergency, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China; Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi Province, China.
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Role of dynorphin in hypoxic pulmonary hypertension. Eur J Pharmacol 2016; 791:78-84. [DOI: 10.1016/j.ejphar.2016.08.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 08/23/2016] [Accepted: 08/24/2016] [Indexed: 11/21/2022]
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Shao J, Wang P, Liu A, Du X, Bai J, Chen M. Punicalagin Prevents Hypoxic Pulmonary Hypertension via Anti-Oxidant Effects in Rats. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2016; 44:785-801. [PMID: 27222062 DOI: 10.1142/s0192415x16500439] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Punicalagin (PG), a major bioactive ingredient in pomegranate juice, has been proven to have anti-oxidative stress properties and to exert protective effects on acute lung injuries induced by lipopolysaccharides. This study aimed to investigate the effects of PG treatment on hypoxic pulmonary hypertension (HPH) and the underlying mechanisms responsible for the effects. Rats were exposed to 10% oxygen for 2 wk (8 h/day) to induce the HPH model. PG (5, 15, 45[Formula: see text]mg/kg) was orally administered 10[Formula: see text]min before hypoxia each day. PG treatments at the doses of 15 and 45[Formula: see text]mg/kg/d decreased the mean pulmonary arterial pressure (mPAP) and alleviated right ventricular hypertrophy and vascular remodeling in HPH rats. Meanwhile, PG treatment attenuated the hypoxia-induced endothelial dysfunction of pulmonary artery rings. The beneficial effects of PG treatment were associated with improved nitric oxide (NO)-cGMP signaling and reduced oxidative stress, as evidenced by decreased superoxide generation, gp91[Formula: see text] expression and nitrotyrosine content in the pulmonary arteries. Furthermore, tempol’s scavenging of oxidative stress also increased NO production and attenuated endothelial dysfunction and pulmonary hypertension in HPH rats. Combining tempol and PG did not exert additional beneficial effects compared to tempol alone. Our study indicated for the first time that PG treatment can protect against hypoxia-induced endothelial dysfunction and pulmonary hypertension in rats, which may be induced via its anti-oxidant actions.
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Affiliation(s)
- Jingyun Shao
- Department of Respiratory Medicine, Xi’an Central Hospital Xi’an 710003, China
- Department of Respiratory Medicine, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an 710061, China
| | - Peng Wang
- Department of Respiratory Medicine, Xi’an Central Hospital Xi’an 710003, China
| | - An Liu
- Department of Respiratory Medicine, Xi’an Central Hospital Xi’an 710003, China
| | - Xusheng Du
- Department of Respiratory Medicine, Xi’an Central Hospital Xi’an 710003, China
| | - Jie Bai
- Department of Respiratory Medicine, Xi’an Central Hospital Xi’an 710003, China
| | - Mingwei Chen
- Department of Respiratory Medicine, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an 710061, China
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Zhou X, Wang D, Zhang Y, Zhang J, Xiang D, Wang H. Activation of κ-opioid receptor by U50,488H improves vascular dysfunction in streptozotocin-induced diabetic rats. BMC Endocr Disord 2015; 15:7. [PMID: 25887435 PMCID: PMC4355970 DOI: 10.1186/s12902-015-0004-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 02/18/2015] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Evidence suggests that activation of κ-opioid receptor (KOR) by U50,488H exhibits potential cardiovascular protective properties. However, the effects of U50,488H on vascular dysfunction in diabetes mellitus (DM) are still not clear. The present study was designed to investigate the effects of U50,488H on vascular dysfunction in diabetic rats and explore the underlying mechanisms involved. METHODS Rats were randomly divided into control, DM, DM + vehicle, DM + U50,488H and DM + nor-binaltorphimine (nor-BNI) groups. Streptozotocin injection was used to induce DM. Weight, blood glucose, blood pressure and plasma insulin for each group were measured. Arterial functions were assessed with isolated vessels mounted for isometric tension recordings. Angiotensin II (ANG II), soluble intercellular adhesion molecule-1 (sICAM-1), interleukin (IL)-6 and IL-8 levels were measured by ELISA, and endothelial nitric oxide synthase (eNOS) phosphorylation and NF-κB p65 translocation were measured by Western blot. RESULTS Activation of KOR by U50,488H reduced the enhanced contractility of aortas to KCl and noradrenaline and increased acetylcholine-induced vascular relaxation, which could also protect the aortal ultrastructure in DM. U50,488H treatment resulted in reduction in ANG II, sICAM-1, IL-6 and IL-8 levels and elevation in NO levels, while these effects were abolished by nor-BNI treatment. Further more, eNOS phosphorylation was increased, and NF-κB p65 translocation was decreased after U50,488H treatment. CONCLUSIONS Our study demonstrated that U50,488H may have therapeutic effects on diabetic vascular dysfunction by improving endothelial dysfunction and attenuating chronic inflammation, which may be dependent on phosphorylation of eNOS and downstream inhibition of NF-кB.
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MESH Headings
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/pharmacology
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/therapeutic use
- Animals
- Antihypertensive Agents/pharmacology
- Antihypertensive Agents/therapeutic use
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiopathology
- Diabetes Mellitus, Experimental/drug therapy
- Diabetes Mellitus, Experimental/physiopathology
- Diabetic Angiopathies/physiopathology
- Diabetic Angiopathies/prevention & control
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiopathology
- Male
- Pulmonary Artery/drug effects
- Pulmonary Artery/physiopathology
- Rats
- Rats, Sprague-Dawley
- Receptors, Opioid, kappa/agonists
- Streptozocin
- Vasoconstriction/drug effects
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Affiliation(s)
- Xuan Zhou
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
- Department of Cardiology, General Hospital of Guang Zhou Military Command, Guangzhou, Guangdong, 510011, China.
| | - Dongjuan Wang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
- Department of Cardiology, PLA Navy General Hospital, Beijing, 100048, China.
| | - Yuyang Zhang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
| | - Jinxia Zhang
- Department of Cardiology, General Hospital of Guang Zhou Military Command, Guangzhou, Guangdong, 510011, China.
| | - Dingcheng Xiang
- Department of Cardiology, General Hospital of Guang Zhou Military Command, Guangzhou, Guangdong, 510011, China.
| | - Haichang Wang
- Department of Cardiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
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Li XW, Wang XM, Li S, Yang JR. Effects of chrysin (5,7-dihydroxyflavone) on vascular remodeling in hypoxia-induced pulmonary hypertension in rats. Chin Med 2015; 10:4. [PMID: 25722740 PMCID: PMC4341233 DOI: 10.1186/s13020-015-0032-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 02/09/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Chrysin (5,7-dihydroxyflavone) inhibits platelet-derived growth factor-induced vascular smooth muscle cell proliferation and arterial intima hyperplasia. This study aims to investigate the effects of chrysin on rat pulmonary vascular remodeling in hypoxia-induced pulmonary hypertension (PH). METHODS Sprague-Dawley rats were continuously exposed to 10% O2 for 4 weeks to induce PH. The effect of chrysin (50 or 100 mg/kg/d, subcutaneous) on vascular remodeling was investigated in hypoxia-induced PH model. At the end of the experiments, the indexes for pulmonary vascular remodeling and right ventricle hypertrophy were measured by vascular medial wall thickness and the ratio of right ventricle to (left ventricle plus septum). The expressions of NOX4, collagen I, and collagen III were analyzed by immunohistochemistry, real-time PCR, or western blotting. The proliferation of cultured pulmonary artery smooth muscle cells (PASMCs) was determined by BrdU incorporation and flow cytometry. The levels of malondialdehyde (MDA) and reactive oxygen species (ROS) were also determined by thiobarbituric acid reactive substances assay and 2'7'-dichlorofluorescein diacetate method. RESULTS Chrysin treatment for 4 weeks significantly attenuated pulmonary vascular remodeling and improved collagen accumulation and down-regulated collagen I and collagen III expressions, accompanied by downregulation of NOX4 expression in the pulmonary artery (P = 0.012 for 50 mg/kg/d, P < 0.001 for 100 mg/kg/d) and lung tissue (P = 0.026, P < 0.001). In vitro, chrysin (1, 10, and 100 μM) remarkably attenuated PASMC proliferation (P = 0.021 for 1 μM, P < 0.001 for 10 μM, and P < 0.001 for 100 μM), collagen I expression (P = 0.035, P < 0.001, and P < 0.001), and collagen III expression (P = 0.027, P < 0.001, and P < 0.001) induced by hypoxia, and these inhibitory effects of chrysin were accompanied by inhibition of NOX4 expression (P = 0.019, P < 0.001, and P < 0.001), ROS production (P = 0.038, P < 0.001, and P < 0.001), and MDA generation (P = 0.024, P < 0.001, and P < 0.001). CONCLUSIONS This study demonstrated that chrysin treatment in hypoxia-induced PH in rats reversed the hypoxia-induced (1) elevations of NOX4 expression, (2) productions of ROS and MDA, (3) proliferation of PASMC, and (4) accumulation of collagen.
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Affiliation(s)
- Xian-Wei Li
- Department of Pharmacology, Wannan Medical College, Anhui, 241002 China
| | - Xiang-Ming Wang
- Department of Pathology, Yijishan Hospital, Wannan Medical College, Anhui, 241002 China
| | - Shu Li
- Department of Pathophysiology, Wannan Medical College, Anhui, 241002 China
| | - Jie-Ren Yang
- Department of Pharmacology, Wannan Medical College, Anhui, 241002 China
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Xu XM, Yao D, Cai XD, Ding C, Lin QD, Wang LX, Huang XY. Effect of chronic continual- and intermittent hypoxia-induced systemic inflammation on the cardiovascular system in rats. Sleep Breath 2014; 19:677-84. [PMID: 25395264 DOI: 10.1007/s11325-014-1075-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 10/23/2014] [Accepted: 10/30/2014] [Indexed: 11/24/2022]
Abstract
PURPOSE Obstructive sleep apnea syndrome (OSAS) has been recognized as an important risk factor for cardiovascular morbidity and mortality. However, the underlying mechanisms are poorly understood. Present study aimed to investigate the role of NF-κB-dependent inflammation pathways in pathophysiological responses of cardiovascular system in OSAS. METHODS Thirty male specific pathogen-free (SPF) Sprague-Dawley rats were randomly assigned to normoxia (N) group, continual hypoxia (CH) group, and intermittent hypoxia (IH) group (n = 10) and were exposed to N (21% O2), CH (8% O2), or IH (6-11% O2 for 10 s and 21% O2 for 80 s in every 90 s) for 8 h/day for 35 days. The hemodynamic and pathomorphologic effects of IH and CH exposure were investigated as well as the expression of NF-κB-dependent inflammation factors. RESULTS Chronic IH or CH significantly increased mean pulmonary arterial pressure (mPAP) in rats, while no significant changes occurred in mean carotid arterial pressure (mCAP). The ratio of right ventricle (RV) to left ventricle (LV) + septum (S) was significantly increased by both IH and CH, suggesting RV hypertrophy was induced by IH or CH. Elastic fiber staining showed an irregular pattern of elastic fiber distribution after hypoxia, and aortic tunica media thickness was increased. Both chronic IH and CH upregulated the expressions of transcription factor NF-κB and related pro-inflammatory cytokines and adhesion molecules. CONCLUSIONS The current study expands our understanding that both IH and CH could activate the expression of NF-κB and related inflammatory factors as well as cause pathophysiologic damage to the cardiovascular system in OSAS. All these results provide further support to an emerging hypothesis that activation of NF-κB-dependent inflammation may play a central role in the pathophysiology of cardiovascular dysfunction in OSAS.
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Affiliation(s)
- Xiao-Mei Xu
- Key Laboratory of Heart and Lung, Wenzhou & Department of Respiratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
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Li XW, Du J, Hu GY, Hu CP, Li D, Li YJ, Li XH. Fluorofenidone attenuates vascular remodeling in hypoxia-induced pulmonary hypertension of rats. Can J Physiol Pharmacol 2014; 92:58-69. [DOI: 10.1139/cjpp-2013-0056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Fluorofenidone (AKF-PD) is a novel pyridone derivate that targets transforming growth factor-β1 (TGF-β1) signaling. Previous studies have proven that AKF-PD functions as an antifibrotic agent in pulmonary fibrosis and renal fibrosis models. Activated TGF-β1 signaling is thought to be a major feature of pulmonary hypertension (PH). TGF-β1 exerts powerful pro-proliferation effects on pulmonary arterial smooth muscle cells (PASMCs), and hence, prompts vascular remodeling. This study is designed to investigate the effect of AKF-PD on vascular remodeling in a rat model of hypoxia-induced PH. PH was induced in rats by 4 weeks of hypoxia. The expression of TGF-β1, collagen I, and collagen III was analyzed by ELISA, immunohistochemistry, real-time PCR, or Western blot. Proliferation of cultured PASMCs was determined by the BrdU incorporation method and flow cytometry. The results showed that AKF-PD treatment (0.5 or 1.0 g·(kg body mass)·d−1) for 4 weeks attenuated pulmonary vascular remodeling and improved homodynamic parameters. TGF-β1 level was significantly down-regulated by AKF-PD both in vivo and in vitro. Furthermore, hypoxia- and TGF-β1-induced PASMC proliferation and collagen expression were both significantly suppressed by AKF-PD. These results suggest that AKF-PD ameliorates the progression of PH induced by hypoxia in rats through its regulation of TGF-β1 expression, PASMC proliferation, and the extracellular matrix.
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Affiliation(s)
- Xian-Wei Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road No. 110, Changsha 410078, China
- Department of Pharmacology, Wannan Medical College, Wuhu 241002, China
| | - Jie Du
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road No. 110, Changsha 410078, China
| | - Gao-Yun Hu
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Central South University, Changsha 410013, China
| | - Chang-Ping Hu
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road No. 110, Changsha 410078, China
| | - Dai Li
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha 41008, China
| | - Yuan-Jian Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road No. 110, Changsha 410078, China
| | - Xiao-Hui Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road No. 110, Changsha 410078, China
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Role of κ—Opioid Receptor in Hypoxic Pulmonary Artery Hypertension and Its Underlying Mechanism. Am J Ther 2013; 20:329-36. [DOI: 10.1097/mjt.0b013e318249a08c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Li J, Shi QX, Fan R, Zhang LJ, Zhang SM, Guo HT, Wang YM, Kaye AJ, Kaye AD, Bueno FR, Xu XZ, Yu SQ, Yi DH, Pei JM. Vasculoprotective effect of U50,488H in rats exposed to chronic hypoxia: role of Akt-stimulated NO production. J Appl Physiol (1985) 2012; 114:238-44. [PMID: 23139366 DOI: 10.1152/japplphysiol.00994.2012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Impairment of pulmonary endothelium function in the pulmonary artery is a direct result of chronic hypoxia. This study is to investigate the vasculoprotective effects of U50,488H (a selective κ-opioid receptor agonist) and its underlying mechanism in hypoxia-induced pulmonary artery endothelial functional injury. Chronic hypoxia was simulated by exposing the rats to 10% oxygen for 2 wk. After hypoxia, right ventricular pressure (RVP) and right ventricular hypertrophy index (RVHI) were measured. The pulmonary vascular dysfunction, effect of nitric oxide synthase inhibitor (l-NAME) on the relaxation of U50,488H, and level of nitric oxide (NO) were determined. In vitro, the signaling pathway involved in the anti-apoptotic effect of U50,488H was investigated. Cultured endothelial cells were subjected to simulated hypoxia, and cell apoptosis was determined by TUNEL staining. U50,488H (1.25 mg/kg) significantly reduced RVP and RVHI in hypoxia. U50,488H markedly improved both pulmonary endothelial function (maximal vasorelaxation in response to ACh: 74.9 ± 1.8%, n = 6, P <0.01 vs. hypoxia for 2 wk group) and increased total NO production (1.65 fold). U50,488H relaxed the pulmonary artery rings of the hypoxic rats. This effect was partly abolished by l-NAME. In cells, U50,488H both increased NO production and reduced hypoxia-induced apoptosis. Moreover, pretreatment with nor-binaltorphimine (nor-BNI, a selective κ-opioid receptor antagonist), PI3K inhibitor, Akt inhibitor or l-NAME almost abolished anti-apoptotic effect exerted by U50,488H. U50,488H resulted in increases in Akt and eNOS phosphorylation. These results demonstrate that pretreatment with U50,488H attenuates hypoxia-induced pulmonary vascular endothelial dysfunction in an Akt-dependent and NO-mediated fashion.
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Affiliation(s)
- Juan Li
- Department of Physiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, China
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Miao Q, Shi XP, Ye MX, Zhang J, Miao S, Wang SW, Li B, Jiang XX, Zhang S, Hu N, Li J, Zhang J. Polydatin attenuates hypoxic pulmonary hypertension and reverses remodeling through protein kinase C mechanisms. Int J Mol Sci 2012; 13:7776-7787. [PMID: 22837726 PMCID: PMC3397558 DOI: 10.3390/ijms13067776] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/11/2012] [Accepted: 06/12/2012] [Indexed: 11/28/2022] Open
Abstract
Hypoxic pulmonary hypertension is a life-threatening emergency if untreated. Consistent pulmonary hypertension also leads to arteries and ventricular remodeling. The clinical therapeutic strategy for pulmonary hypertension and the corresponding remodeling mainly interacts with NO, angiotensin II (Ang II) and elevated endothelin (ET) targets. In the present study, we evaluated the effects of polydatin on hypoxia-induced pulmonary hypertension. It was observed that polydatin attenuated hypoxic pulmonary hypertension, reversed remodeling, and regulated NO, Ang II, ET contents in the serum and lung samples. However, forced activation of PKC signaling by its selective activator thymeleatoxin (THX) could abate the effects of polydatain. These results suggest that polydatin might be a promising candidate for hypoxic pulmonary treatment through interaction with PKC mechanisms.
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Affiliation(s)
- Qing Miao
- Institute of Materia Medica, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (Q.M.); (S.M.); (S.Z.)
| | - Xiao-Peng Shi
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mail:
| | - Ming-Xiang Ye
- Department of Pulmonary Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (M.-X.Y.); (B.L.); (X.-X.J.)
| | - Jin Zhang
- Department of Plastic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mail:
| | - Shan Miao
- Institute of Materia Medica, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (Q.M.); (S.M.); (S.Z.)
| | - Si-Wang Wang
- Institute of Materia Medica, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (Q.M.); (S.M.); (S.Z.)
- Authors to whom correspondence should be addressed; E-Mails: (S.-W.W.); (J.Z.); Tel.: +86-29-8477-4748 (S.-W.W.); +86-29-8477-1132 (J.Z.); Fax: +86-29-8322-4790 (S.-W.W.); +86-29-8477-1132 (J.Z.)
| | - Bo Li
- Department of Pulmonary Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (M.-X.Y.); (B.L.); (X.-X.J.)
| | - Xiu-Xiu Jiang
- Department of Pulmonary Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (M.-X.Y.); (B.L.); (X.-X.J.)
| | - Song Zhang
- Institute of Materia Medica, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (Q.M.); (S.M.); (S.Z.)
| | - Nan Hu
- Institute of Stomatology, General Hospital of People’s Liberation Army, Beijing 100853, China; E-Mail:
| | - Juan Li
- Department of Physiology, Fourth Military Medical University, Xi’an 710032, China; E-Mail:
| | - Jian Zhang
- Department of Pulmonary Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China; E-Mails: (M.-X.Y.); (B.L.); (X.-X.J.)
- Authors to whom correspondence should be addressed; E-Mails: (S.-W.W.); (J.Z.); Tel.: +86-29-8477-4748 (S.-W.W.); +86-29-8477-1132 (J.Z.); Fax: +86-29-8322-4790 (S.-W.W.); +86-29-8477-1132 (J.Z.)
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Chen WS, Li XQ, Cao W, Xiao X, Dong L, Zhang JZ. Vardenafil ameliorates calcium mobilization in pulmonary artery smooth muscle cells from hypoxic pulmonary hypertensive mice. Arch Med Res 2012; 43:265-73. [PMID: 22704850 DOI: 10.1016/j.arcmed.2012.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2011] [Accepted: 04/30/2012] [Indexed: 10/28/2022]
Abstract
BACKGROUND AND AIMS Vardenafil has been found to be potent in pulmonary hypertension; however, the underlying mechanisms remain poorly understood. To address this issue, we investigated the underlying mechanisms of vardenafil in the contribution of Ca(2+) signaling and mobilization in modifying vasoconstriction of pulmonary arteries in hypoxic mice. METHODS Hemodynamic measurements and morphological studies were performed. Muscle tension was measured by PowerLab system. I(Ca,L) was recorded using a perforated patch-clamp technique. [Ca(2+)](i) was measured using a fluorescence imaging system. RESULTS Vardenafil greatly inhibited RVSP increases, RV hypertrophy and ameliorated pulmonary artery remodeling in response to chronic hypoxia. Membrane depolarization following 50 mM high K(+)-caused muscle contraction significantly decreased from 101.7 ± 10.1 in the hypoxia group to 81.8 ± 5.0 mg in hypoxia plus vardenafil arteries. Fifty mM high K(+)-elicited increase [Ca(2+)](i) was markedly decreased from 610.6 ± 71.8 in hypoxia cells to 400.3 ± 47.2 nM in hypoxia plus vardenafil cells. Application of vardenafil greatly inhibited the density of I(Ca,L) by 37.7% compared with that in the hypoxia group. Administration of 1 μM phenylephrine to stimulate α(1)-adrenergic receptor resulted in a smaller increase in [Ca(2+)](i) in hypoxia plus vardenafil cells than that in hypoxia cells. One hundred μM ATP-mediated increase in [Ca(2+)](i) was also inhibited in vardenafil-hypoxia group (from 625.8 ± 62.3 to 390.9 ± 38.1 nM), suggesting that internal calcium reserves contribute to neurotransmitter-induced Ca(2+) release from the SR through IP(3)Rs in PASMCs. CONCLUSIONS Vardenafil may effectively block Ca(2+) influx through L-type Ca(2+) channel and inhibit the Ca(2+) release from SR through IP(3)Rs, thus enhancing its vasorelaxation of pulmonary arteries under hypoxia conditions.
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Affiliation(s)
- Wen-Sheng Chen
- Department of Cardiovascular Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Wu X, Zhang B, Fan R, Zhao L, Wang Y, Zhang S, Kaye AD, Huang L, Pei J. U50,488H inhibits neutrophil accumulation and TNF-α induction induced by ischemia–reperfusion in rat heart. Cytokine 2011; 56:503-7. [DOI: 10.1016/j.cyto.2011.07.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 06/24/2011] [Accepted: 07/15/2011] [Indexed: 01/04/2023]
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Abstract
This paper is the 32nd consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2009 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (Section 2), and the roles of these opioid peptides and receptors in pain and analgesia (Section 3); stress and social status (Section 4); tolerance and dependence (Section 5); learning and memory (Section 6); eating and drinking (Section 7); alcohol and drugs of abuse (Section 8); sexual activity and hormones, pregnancy, development and endocrinology (Section 9); mental illness and mood (Section 10); seizures and neurologic disorders (Section 11); electrical-related activity and neurophysiology (Section 12); general activity and locomotion (Section 13); gastrointestinal, renal and hepatic functions (Section 14); cardiovascular responses (Section 15); respiration and thermoregulation (Section 16); and immunological responses (Section 17).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, 65-30 Kissena Blvd., Flushing, NY 11367, USA.
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Tong G, Sun Z, Wei X, Gu C, Kaye AD, Wang Y, Li J, Zhang Q, Guo H, Yu S, Yi D, Pei J. U50,488H postconditioning reduces apoptosis after myocardial ischemia and reperfusion. Life Sci 2010; 88:31-8. [PMID: 21034750 DOI: 10.1016/j.lfs.2010.10.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Revised: 10/01/2010] [Accepted: 10/15/2010] [Indexed: 01/01/2023]
Abstract
AIMS Evidence has indicated U50,488H, a selective κ-opioid receptor (κ-OR) agonist, administered before ischemia attenuates apoptosis and infarction during ischemia and reperfusion (I/R). However, it remains unclear whether U50,488H postconditioning reduces apoptosis during I/R. This study was designed, therefore, to test the hypothesis that U50,488H administered at the onset of reperfusion inhibits cardiomyocyte apoptosis and to investigate the underlying mechanisms. MAIN METHODS Male Sprague-Dawley rats were subjected to myocardial ischemia and reperfusion(MI/R) and were randomized to receive either vehicle, U50,488H, U50,488H plus Nor-BNI, a selective κ-OR antagonist, U50,488H plus wortmannin, a specific inhibitor of phosphoinositide 3'-kinase (PI3K), or U50,488H plus L-NAME, a nitric oxide synthase inhibitor (NOS inhibitor), immediately prior to reperfusion. In vitro study was performed on cultured neonatal cardiomyocytes subjected to simulated ischemia/reperfusion. KEY FINDINGS Treatment with U50,488H resulted in increases in Akt and endothelial nitric oxide synthase (eNOS) phosphorylation with secondary NO production both in vivo and in vitro and these effect were completely blocked by wortmannin and specific Akt inhibitor(AI). L-NAME treatment had no effect on Akt and eNOS phosphorylation; but, significantly reduced NO production. Moreover, treatment with U50,488H markedly reduced myocardial apoptotic death. Treatment with wortmannin and specific Akt inhibitor abolished the anti-apoptotic effect of U50,488H. L-NAME also significantly attenuated the anti-apoptotic effect of U50,488H. SIGNIFICANCE These results demonstrate that U50,488H administered immediately prior to reperfusion increases Akt phosphorylation through a PI3-kinase-dependent mechanism and reduces postischemic myocardial apoptosis. Phosphorylation of eNOS with secondary NO production contribute significantly to the anti-apoptotic effect of U50,488H postconditioning.
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Affiliation(s)
- Guang Tong
- Department of Cardiovascular Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
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