Palmitic acid-induced lipotoxicity and protection by (+)-catechin in rat cortical astrocytes

Kar Lok Wong, Yu Ru Wu, Ka Shun Cheng, Paul Chan, Chi Wai Cheung, Dah Yuu Lu, Tzu Hui Su, Zhong Min Liu, Yuk Man Leung

研究成果: 雜誌貢獻文章同行評審

27 引文 斯高帕斯(Scopus)

摘要

Background Astrocytes do not only maintain homeostasis of the extracellular milieu of the neurons, but also play an active role in modulating synaptic transmission. Palmitic acid (PA) is a saturated fatty acid which, when being excessive, is a significant risk factor for lipotoxicity. Activation of astrocytes by PA has been shown to cause neuronal inflammation and demyelination. However, direct damage by PA to astrocytes is relatively unexplored. The aim of this study was to identify the mechanism(s) of PA-induced cytotoxicity in rat cortical astrocytes and possible protection by (+)-catechin. Methods Cytotoxicity and endoplasmic reticulum (ER) markers were assessed by MTT assay and Western blotting, respectively. Cytosolic Ca 2+ and mitochondrial membrane potential (MMP) were measured microfluorimetrically using fura-2 and rhodamine 123, respectively. Intracellular reactive oxygen species (ROS) production was assayed by the indicator 2′-7′-dichlorodihydrofluorescein diacetate. Results Exposure of astrocytes to 100 μM PA for 24 h resulted in apoptotic cell death. Whilst PA-induced cell death appeared to be unrelated to ER stress and perturbation in cytosolic Ca2+ signaling, it was likely a result of ROS production and subsequent MMP collapse, since ascorbic acid (anti-oxidant, 100 μM) prevented PA-induced MMP collapse and cell death. Co-treatment of astrocytes with (+)-catechin (300 μM), an anti-oxidant found abundantly in green tea, significantly prevented PA-induced ROS production, MMP collapse and cell death. Conclusion Our results suggest that PA-induced cytotoxicity in astrocytes may involve ROS generation and MMP collapse, which can be prevented by (+)-catechin.

原文英語
頁(從 - 到)1106-1113
頁數8
期刊Pharmacological Reports
66
發行號6
DOIs
出版狀態已發佈 - 十二月 2014

ASJC Scopus subject areas

  • Pharmacology

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