期刊
FREE RADICAL BIOLOGY AND MEDICINE
卷 49, 期 3, 页码 416-426出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2010.04.031
关键词
Oxidative stress; Neuroprotection; Phase II Response; Detoxification
资金
- CONACYT [129838]
- Spanish Ministry of Science and Innovation
- [SAF2007-62646]
- [BFU2008-02699]
Although extracellular purines may have both trophic and apoptotic functions in the brain depending on the targeted purine receptor and cell type, little is known about the role of specific purine receptors on neurons. In this study, we demonstrate that both ADP and its stable analogue 2-methyl-thio-ADP (2MeSADP) induce up-regulation of the cytoprotective protein heme oxygenase-1 (HO-1). Selective inhibition of 2MeSADP-responsive receptors P2Y(1) and P2Y(13) with their respective antagonists MRS2179 and MRS2211 and the use of pertussis toxin demonstrated a role of the purinergic P2Y(13) receptor in this response. Moreover, luciferase assays demonstrated that ectopic expression of the P2Y(13) receptor in neuroblastoma N2A cells resulted in 2MeSADP-dependent induction of antioxidant response elements from the HO-1 promoter. The transcription factor Nrf2 was critical for HO-1 activation and translocated from the cytosol to the nucleus in response to 2MeSADP. In cerebellar granule neurons (CGNs) derived from Nrf2-knockout mice this purine did not activate the Nrf2/HO-1 axis and did not protect against H2O2-induced cell death. The relevance of HO-1 in 2MeSADP-induced neuroprotection was further demonstrated by the evidence that HO-1 inhibition with tin protoporphyrin (SnPP) prevented protection against H2O2-induced oxidative stress and cell death. These observations reveal a previously unrecognized role in protection against oxidative stress by extracellular purines acting on the metabotropic P2Y(13)-receptor and provide new perspectives for neuroprotective therapies. (C) 2010 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据