期刊
NEUROCHEMISTRY INTERNATIONAL
卷 61, 期 1, 页码 89-99出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuint.2012.04.005
关键词
Ethyl pyruvate; Hemeoxygenase 1; Astrocytes; GDNF; Nrf2
资金
- Translational Research Grant [A100793]
- Korea Health Industry Development Institute (KHIDI)
- Inha University
Ethyl pyruvate (EP), a simple ester of pyruvic acid, has been shown to act as an anti-inflammatory molecule under various pathological conditions, such as, during cerebral ischemia and sepsis in animal models. Here, the authors investigated the novel molecular mechanism underlying the anti-oxidative effect of EP in primary astrocyte cultures, particularly with respect to nuclear factor E2-related factor 2 (Nrf2) activation and hemeoxygenase 1 (HO-1) induction. EP was found to induce Nrf2 translocation and the inductions of various genes downstream of Nrf2 and these resulted in the amelioration of the oxidative damage of H2O2. Furthermore, EP dose-dependently suppressed H2O2-induced astrocyte cell death (12 h preincubation with 5 mM EP increased cell survival after 1 h exposure to 100 mu M H2O2 from 32.6 +/- 0.7% to 63 +/- 1.8%). HO-1 was markedly induced (4.9-fold) in EP-treated primary astrocyte cultures and Nrf2 was found to translocate from the cytosol to the nucleus and bind to the antioxidant response element (ARE) located on HO-1 promoter after EP treatment. siRNA-mediated HO-1 or Nrf2 knockdown and zinc protoporphyrin (ZnPP)-mediated inhibition of HO-1 activity showed that Nrf2 activation and HO-1 induction were responsible for the observed cytoprotective effect of EP, which was found to involve the ERK and Akt signaling pathways. Furthermore, EP-conditioned astrocyte culture media was found to have neuroprotective effects on primary neuronal cultures exposed to oxidative or excitotoxic stress, and this seemed to be mediated by glial cell line-derived neurotrophic factor (GDNF) and glutathione (GSH), which accumulated in EP-treated astrocyte culture media. Interestingly, we also found that in addition to HO-1, EP-induced Nrf2 activation increased the expressions of various anti-oxidant genes, including GST, NQO1, and GCLM. The study shows that EP-mediated Nrf2 activation and HO-1 induction in astrocytes act via autocrine and paracrine mechanisms to confer protective effects. (C) 2012 Elsevier Ltd. All rights reserved.
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