期刊
NEUROCHEMISTRY INTERNATIONAL
卷 58, 期 7, 页码 751-758出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuint.2011.02.023
关键词
GLT-1a; GLT-1b; Astrocytes; Alternative splicing; Neuroinflammation; Tumor necrosis factor-alpha
资金
- National Fund for Scientific Research (FNRS, Belgium. Conventions des Fonds de la Recherche Scientifique Medicale) [3.4560.07, 1.5.109.09.F]
- Belgium's Walloon region (DGTRE)
- Queen Elisabeth Medical Foundation (F.R.M.E.)
- Association Beige pour les Maladies Neuromusculaires (ABMM)
The high-affinity glutamate transporter GLT-1 plays a key role in the control of the glutamate homeostasis in the central nervous system and protects neurons against excitotoxicity. Splice variants of the original transcript have been identified and their involvement in neurodegenerative disorders has been proposed. However, the functions and the regulations of these isoforms remain unclear. In this study, we focused our interest on the expression of two C-terminal splice variants of GLT-1 (GLT-1a and b) in primary astrocyte cultures exposed to distinct chemical environments. While GLT-1a and GLT-1b mRNAs were both increased in response to treatment with N-6,2'-O-dibutyryladenosine 3',5'-cyclic monophosphate (dBcAMP), the culture supplement G5 or tumor necrosis factor-alpha (TNF-alpha), the regulation of GLT-1b appeared quicker and was more pronounced. Besides, using validated antibodies, we evidenced a differential regulation of the two proteins in cells exposed to TNF-alpha. Thus, while dBcAMP and the G5 supplement stimulated the expression of both isoforms at 3 and 7 days, a transient upregulation of GLT-1a was induced by TNF-alpha., which contrasts with the sustained induction of the GLT-1b isoform. These results shed light on the complex influence of the pro-inflammatory cytokine TNF-alpha on GLT-1a mRNA and protein expression and on the necessity to distinctly consider the GLT-1 isoforms with appropriate tools in studies addressing the regulation of glutamate transporters. (C) 2011 Elsevier Ltd. All rights reserved.
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