کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4326252 1614078 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thrombin-induced neuronal protection: Role of the mitogen activated protein kinase/ribosomal protein S6 kinase pathway
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Thrombin-induced neuronal protection: Role of the mitogen activated protein kinase/ribosomal protein S6 kinase pathway
چکیده انگلیسی

Our previous studies have found that intracerebral pretreatment with a low dose of thrombin (thrombin preconditioning, TPC) reduces infarct volume and attenuates brain edema after focal cerebral ischemia. In this study, we examined whether TPC protects against the neuronal death induced by oxygen glucose deprivation (OGD), and whether the protection is through thrombin receptors and the p44/42 mitogen activated protein kinases (MAPK)/ribosomal protein S6 kinases (p70 S6K) pathway. Expression of protease-activated receptors (PARs) mRNA was detected in cultured primary rat neurons and thrombin upregulated PAR-1 and PAR-4 mRNA expression. TPC reduced OGD-induced neuronal death (e.g. dead cells: 52.5 ± 5.4% vs. 72.3 ± 7.2% in the control group, n = 6, p < 0.01). Agonists of PAR-1 and PAR-4 mimicked the effects of thrombin and reduced OGD-induced neuronal death. Pretreatment with thrombin or PAR agonists induced the upregulation of activated p44/42 MAPK and p70S6K (Thr 421/Ser 424). PD98059, an inhibitor of p44/42 MAPK kinase, blocked thrombin-induced upregulation of activated p44/42 MAPK and p70S6K. It also reduced TPC-induced neuronal protection (e.g. dead cells: 68.2 ± 5.2% vs. 56.9 ± 4.6% in vehicle + TPC group, n = 6, p < 0.05). These results suggest that TPC-induced ischemic tolerance is through activation of thrombin receptors and the p44/42 MAPK/p70S6K pathway.

Research Highlights
► Thrombin preconditioning(TPC) can protect against neuronal death induced by OGD.
► The activating peptides of thrombin receptors can mimick the protective effects of thrombin.
► TPC upregulated activated p44/42 MAPK and p70S6K.
► PD098059 blocked TPC-induced neuronal protection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Research - Volume 1361, 18 November 2010, Pages 93–101
نویسندگان
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