Abstract |
Hypoxia-induced inflammation and excessive proliferation of pulmonary artery smooth muscle cells (PASMCs) play important roles in the pathological process of hypoxic pulmonary hypertension (HPH). Melatonin possesses anti-inflammatory and antiproliferative properties. However, the effect of melatonin on HPH remains unclear. In this study, adult Sprague-Dawley rats were exposed to intermittent chronic hypoxia for 4 wk to mimic a severe HPH condition. Hemodynamic and pulmonary pathomorphology data showed that chronic hypoxia significantly increased right ventricular systolic pressures (RVSP), weight of the right ventricle/left ventricle plus septum (RV/LV+S) ratio, and median width of pulmonary arterioles. Melatonin attenuated the elevation of RVSP, RV/LV+S, and mitigated the pulmonary vascular structure remodeling. Melatonin also suppressed the hypoxia-induced high expression of proliferating cell nuclear antigen ( PCNA), hypoxia-inducible factor-1α (HIF-1α), and nuclear factor-κB (NF-κB). In vitro, melatonin concentration-dependently inhibited the proliferation of PASMCs and the levels of phosphorylation of Akt and extracellular signal-regulated kinases1/2 (ERK1/2) caused by hypoxia. These results suggested that melatonin might potentially prevent HPH via anti-inflammatory and antiproliferative mechanisms.
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Authors | Haifeng Jin, Yueyue Wang, Lei Zhou, Lu Liu, Peng Zhang, Wuguo Deng, Yuhui Yuan |
Journal | Journal of pineal research
(J Pineal Res)
Vol. 57
Issue 4
Pg. 442-50
(Nov 2014)
ISSN: 1600-079X [Electronic] England |
PMID | 25251287
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. |
Chemical References |
- Anti-Inflammatory Agents
- Antioxidants
- Melatonin
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Topics |
- Animals
- Anti-Inflammatory Agents
(pharmacology)
- Antioxidants
(pharmacology)
- Blotting, Western
- Cell Proliferation
(drug effects)
- Hypertension, Pulmonary
(etiology, physiopathology)
- Hypoxia
(complications)
- Immunohistochemistry
- Inflammation
(etiology)
- Male
- Melatonin
(pharmacology)
- Myocytes, Smooth Muscle
(drug effects)
- Pulmonary Artery
(drug effects)
- Rats
- Rats, Sprague-Dawley
- Real-Time Polymerase Chain Reaction
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