Functional modulation of voltage-dependent sodium channel expression by wild type and mutated C121W-β1 subunit
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- 作者：Debora Baroni (1)
Raffaella Barbieri (1)
Cristiana Picco (1)
Oscar Moran (1) - 关键词：Voltage ; gated sodium channel ; Epilepsy ; mRNA ; Western blot ; Electrophysiology
- 刊名：Journal of Bioenergetics and Biomembranes
- 出版年：2013
- 出版时间：August 2013
- 年：2013
- 卷：45
- 期：4
- 页码：353-368
- 全文大小：764KB
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Raffaella Barbieri (1)
Cristiana Picco (1)
Oscar Moran (1)
1. Istituto di Biofisica, CNR, Via De Marini, 6, 16149, Genova, Italy
文摘
Voltage dependent sodium channels are membrane proteins essential for cell excitability. They are composed by a pore-forming α-subunit, encoded in mammals by up to 9 different genes, and 4 different ancillary β-subunits. The expression pattern of the α subunit isoforms confers the distinctive functional and pharmacological properties to different excitable tissues. β subunits are important modulators of channel function and expression. Mutation C121W of the β1-subunit causes an autosomal dominant epileptic syndrome without cardiac symptoms. The C121W mutation may act by a dominant-competition, modifying the expression of α-subunit proteins. To test this hypothesis, we transfected GH3 cells, from neuro-ectoderm origin, with wild-type or mutant β1 subunits and compared them to native cells. To examine the tissue specificity of the C121W-β1 mutation, we compared the effects of the mutation on neural cells with those of H9C2 cells of cardiac origin. We found that in GH3 cells the over-expression of the β1 subunit augments the α subunit mRNA and protein levels, while in the H9C2 cells the enhanced level of β1 subunit not only increases but also qualitatively modifies the sodium channel α isoform expression pattern. Interestingly, the introduction of the epileptogenic C121W-β1 subunit does not alter the sodium channel isoform composition of GH3 cells, while produces additional changes in the α-subunit expression pattern of H9C2 cells. Electrophysiological measurements confirm these molecular results. The expression differences observed could be correlated to the tissue-specific regulatory action of the β1 subunit and to the nervous system specificity of the C121W mutation. Our findings could be helpful for the comprehension of the molecular mechanism of generalised epileptic with febrile seizures plus in patients with identified β1 subunit mutations.