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01-04-2013 | Original Article

Gemfibrozil Pretreatment Affecting Antioxidant Defense System and Inflammatory, but not Nrf-2 Signaling Pathways Resulted in Female Neuroprotection and Male Neurotoxicity in the Rat Models of Global Cerebral Ischemia–Reperfusion

Authors: Fatemeh Mohagheghi, Leila Khalaj, Abolhassan Ahmadiani, Behrouz Rahmani

Published in: Neurotoxicity Research | Issue 3/2013

Abstract

Two important pathophysiological mechanisms involved during cerebral ischemia are oxidative stress and inflammation. In pathological conditions such as brain ischemia the ability of free radicals production is greater than that of elimination by endogenous antioxidative systems, so brain is highly injured due to oxidation and neuroinflammation. Fibrates as peroxisome proliferator-activated receptor (PPAR)-α ligands, are reported to have antioxidant and anti-inflammatory actions. In this study, gemfibrozil, a fibrate is investigated for its therapeutic potential against global cerebral ischemia–reperfusion (I/R) injury of male and female rats. This study particularly has focused on inflammatory and antioxidant signaling pathways, such as nuclear factor erythroid-related factor (Nrf)-2, as well as the activity of some endogenous antioxidant agents. It was found that pretreatment of animals with gemfibrozil prior to I/R resulted in a sexually dimorphic outcome. Within females it proved to be protective, modulating inflammatory factors and inducing antioxidant defense system including superoxide dismutase (SOD), catalase, as well as glutathione level. However, Nrf-2 signaling pathway was not affected. It also decreased malondialdehyde level as an index of lipid peroxidation. In contrast, gemfibrozil pretreatment was toxic to males, enhancing the expression of inflammatory factors such as tumor necrosis factor-α, nuclear factor-κB, and cyclooxygenase-2, and decreasing Nrf-2 expression and SOD activity, leading to hippocampal neurodegeneration. Considering that gemfibrozil is a commonly used anti-hyperlipidemic agent in clinic, undoubtedly more investigations are crucial to exactly unravel its sex-dependent neuroprotective/neurodegenerative potential.

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Title: Gemfibrozil Pretreatment Affecting Antioxidant Defense System and Inflammatory, but not Nrf-2 Signaling Pathways Resulted in Female Neuroprotection and Male Neurotoxicity in the Rat Models of Global Cerebral Ischemia–Reperfusion
Authors: Fatemeh Mohagheghi
Leila Khalaj
Abolhassan Ahmadiani
Behrouz Rahmani
Publication date: 01-04-2013
Publisher: Springer-Verlag
Published in: Neurotoxicity Research / Issue 3/2013
Print ISSN: 1029-8428
Electronic ISSN: 1476-3524
DOI: https://doi.org/10.1007/s12640-012-9338-3

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Gemfibrozil Pretreatment Affecting Antioxidant Defense System and Inflammatory, but not Nrf-2 Signaling Pathways Resulted in Female Neuroprotection and Male Neurotoxicity in the Rat Models of Global Cerebral Ischemia–Reperfusion

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