Abstract:
:Atherosclerosis and related cardiovascular diseases (CVD) represent one of the greatest threats to human health worldwide. The protection of vascular smooth muscle cells (VSMCs) from apoptosis in the plaque has become an important therapeutic target for atherosclerotic plaque stabilization. A significant association of selenoprotein S (SelS) gene polymorphism with atherosclerotic CVD has been reported in epidemiologic studies, but the underlying mechanism remains unknown. In this paper, SelS expression in the thoracic aorta and its role in the protection of VSMCs from apoptosis have been studied. Western blot analysis showed that SelS was highly expressed in rat thoracic aorta. SelS gene silence by small interference RNA (siRNA) rendered VSMCs more sensitive to hydrogen peroxide- or tunicamycin- induced injury and apoptosis, as determined by MTT assay, Hoechst staining, and annexin V/propidium iodide staining. SelS silence aggravated hydrogen peroxide-induced oxidative stress and phosphorylation of p38 MAPK and c-Jun N-terminal kinase (JNK) in VSMCs. Furthermore, SelS silence enhanced endoplasmic reticulum (ER) stress induced by hydrogen peroxide or tunicamycin, as showed by the increased protein levels of ER chaperone 78 kDa glucose-regulated protein (GRP78), ER stress transducer phosphorylated protein kinase RNA like ER kinase (PERK), and the proapoptotic transcription factor C/EBP homologous protein (CHOP). In conclusion, the present study suggested that SelS highly expressed in the blood vessel might protect VSMCs from apoptosis by inhibiting oxidative stress and ER stress. Our finding provided mechanistic insights for the potential preventive role of SelS in atherosclerotic CVD.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Ye Y,Fu F,Li X,Yang J,Liu Hdoi
10.1002/jcb.25254subject
Has Abstractpub_date
2016-01-01 00:00:00pages
106-17issue
1eissn
0730-2312issn
1097-4644journal_volume
117pub_type
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