Rac1 and Cdc42 Play Important Roles in Arsenic Neurotoxicity in Primary Cultured Rat Cerebellar Astrocytes
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- 作者：Yuan An ; Tingting Liu ; Xiaona Liu ; Lijun Zhao…
- 关键词：Sodium arsenite ; Astrocytes ; Rho GTPases ; Apoptosis
- 刊名：Biological Trace Element Research
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：170
- 期：1
- 页码：173-182
- 全文大小：10,856 KB
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Tingting Liu (1)
Xiaona Liu (1)
Lijun Zhao (1)
Jing Wang (1)
1. Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, 157# Baojian Road, Harbin, 150081, People’s Republic of China - 刊物主题：Biochemistry, general; Biotechnology; Nutrition; Oncology;
- 出版者：Springer US
- ISSN：1559-0720
文摘
This study aimed to explore whether Rac1 and Cdc42, representative members of Ras homologue guanosine triphosphatases (Rho GTPases), are involved in neurotoxicity induced by arsenic exposure in rat nervous system. Expressions of Rac1 and Cdc42 in rat cerebellum and cerebrum exposed to different doses of NaAsO2 (Wistar rats drank 0, 2, 10, and 50 mg/L NaAsO2 water for 3 months) were examined. Both Rac1 and Cdc42 expressions increased significantly in a dose-dependent manner in cerebellum (P < 0.01) by Western blot and immunohistochemistry assay, but in cerebrum, Rac1 and Cdc42 expressions only in 2 mg/L exposure groups were significantly higher than those in control groups (P < 0.01). Five to 50 μM NaAsO2 decreased cell viability in a dose-dependent manner in primary cultured rat astrocytes, whereas 1 μM NaAsO2 increased the cell viability in these cells. Rac1 inhibitor, NSC23766, decreased NaAsO2-induced apoptosis and increased the cell viability in primary cultured rat cerebellar astrocytes exposed to 30 μM NaAsO2. Cdc42 inhibitor, ZCL278, increased cell viability in the cells exposed to 30 μM NaAsO2. Taken together, our current studies in vivo and in vitro indicate that activations of Rac1 and Cdc42 play a very important role in arsenic neurotoxicity in rat cerebellum, providing a new insight into arsenic neurotoxicity. Keywords Sodium arsenite Astrocytes Rho GTPases Apoptosis