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Neurol Res. 2007 Sep;29(6):628-31.

Overexpression of mouse IsK protein fused to green fluorescent protein induces apoptosis of human astroglioma cells.

Author information

1
Laboratory of Experimental Neurosurgery, and Multidisciplinary Research Institute (IRIBHM), Université Libre de Bruxelles, 808 route de Lennik, 1070 Brussels, Belgium. tstath@hotmail.com

Abstract

Intracellular K(+) plays an important role in controlling ion homeostasis for maintaining cell volume and inhibiting activity of pro-apoptotic enzymes. Cytoplasmic K(+) concentration is regulated by K(+) uptake via Na(+) -K(+) -ATPase and K(+) efflux through K(+) channels in the plasma membrane. The IsK (KCNE1) protein is known to co-assemble with KCNQ1 (KvLQT1) protein to form a K(+) channel underlying the slowly activating delayed rectifier K(+) outward current which delays voltage activation. In order to further study the activity and cellular localization of IsK protein, we constructed a C-terminal fusion of IsK with EGFP (enhanced green fluorescent protein). Expression of the fusion protein appeared as clusters located in the plasma membrane and induced degeneration of both transiently or stably transfected cells.

PMID:
17535562
DOI:
10.1179/016164107X166326
[Indexed for MEDLINE]

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