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Eur J Pharmacol. 2009 Apr 1;607(1-3):6-14.

Salidroside protects cardiomyocyte against hypoxia-induced death: a HIF-1alpha-activated and VEGF-mediated pathway.

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  • 1Laboratory of Senile Encephalopathy with the Integrated Traditional Chinese Medicine and Western Medicine, Research Center of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.

Abstract

Cardiomyocyte death (necrosis and apoptosis) plays a critical role in the progress of heart diseases. Salidroside, a phenylpropanoid glycoside isolated from Rhodiola rosea L, has shown cardioprotective effects in vivo. However, whether salidroside has a protective effect against cardiomyocyte death is poorly understood. The present study was aimed to investigate the cardioprotective role of salidroside and the underlying mechanisms in hypoxia-induced cardiomyocyte death. Cardiomyocytes pretreated with or without salidroside for 24 h were exposed to hypoxic condition for 6 h and then cell viability, necrosis, apoptosis, the expressions of HIF-1alpha and VEGF were investigated. Pretreatment with salidroside markedly attenuated hypoxia-induced cell viability loss, cell necrosis and apoptosis in a dose-dependent manner. Mechanistically, pretreatment with salidroside up-regulated the HIF-1alpha protein expression and induced its translocation. Moreover, the level of VEGF, a downstream target of HIF, was significantly increased in parallel with the level of HIF-1alpha following pretreatment with salidroside. However, 2-methoxyestradiol (2-ME2), a HIF-1alpha inhibitor, attenuated the protection of salidroside and blocked the increase of HIF-1alpha and VEGF. These data indicated that salidroside has protective effect against hypoxia-induced cardiomyocytes necrosis and apoptosis by increasing HIF-1alpha expression and subsequently up-regulating VEGF levels.

PMID:
19326475
[PubMed - indexed for MEDLINE]
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