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22 December 2017 : Laboratory Research  

Baicalin Suppresses Hypoxia-Reoxygenation-Induced Arterial Endothelial Cell Apoptosis via Suppressing PKCδ/p53 Signaling

Xiaoling Shou1ABDE, Bozhong Wang1AD, Rongfang Zhou1AB, Lei Wang1DF, Aihua Ren1ACD, Shangping Xin1CEFG, Liyue Zhu2AFG*

DOI: 10.12659/MSM.907989

Med Sci Monit 2017; 23:6057-6063

Abstract

BACKGROUND: This study was aimed to investigate the protective role of baicalin on vascular endothelium exposed to ischemia reperfusion injury and the involved molecular mechanisms.

MATERIAL AND METHODS: Cultured human arterial endothelial cells (HAECs) were exposed to hypoxia/deoxygenation (H/R). Cells were also treated with baicalin at serially diluted concentrations. Cells were also treated with PKC activator PEP005 or specific siRNA against protein kinase Cδ (PKCδ). MTT assay was used to evaluate the cell viabilities. Flow cytometry was used to detect cell apoptosis. The protein phosphorylation and expression levels were determined by Western blotting.

RESULTS: PKCδ-siRNA transfection increased cell viabilities and reduced cell apoptosis in HAECs exposed to H/R. Baicalin treatment preserved cell viabilities and reduced apoptosis of H/R-exposed HAECs in a concentration- dependent manner. Baicalin treatment reduced phosphorylation levels of PKCδ and p53, as well as the expression levels of active caspase3 and bax in HAECs exposed to H/R. The treatment of PKC activator PEP005 impaired the protective effects of baicalin in increasing cell viabilities and reducing apoptosis in HAECs exposed to H/R.

CONCLUSIONS: Baicalin exerts vascular a protective effect on HAECs exposed to H/R by reducing cell apoptosis. The PKCδ/p53 apoptotic signaling pathway was the pharmacological target of baicalin.

Keywords: endothelial cells, Protein Kinase C-delta, Reperfusion Injury

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750