GlialCAM, a Protein Defective in a Leukodystrophy, Serves as a ClC-2 Cl^{?/sup> Channel Auxiliary Subunit}

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• 作者：Elena Jeworutzki¹ ; ¹¹ ; Tania Ló ; pez-Hern&#225 ; ndez² ; ¹¹ ; Xavier Capdevila-Nortes² ; Sò ; nia Sirisi² ; ⁵ ; Luiza Bengtsson⁴ ; Marisol Montolio² ; ⁶ ; Giovanni Zifarelli¹ ; Tanit Arnedo² ; Catrin  ; S. Mü ; ller⁸ ; Uwe Schulte⁸ ; Virginia Nunes³ ; ⁵ ; ⁷ ; Albert Martí ; nez⁹ ; Thomas  ; J. Jentsch⁴ ; Xavier Gasull¹⁰ ; Michael Pusch¹ ; ¹¹ ; Raú ; l Esté ; vez² ; ⁶ ; ¹¹ ; ^{restevez@ub.edu}
• 刊名：Neuron
• 出版年：2012
• 出版时间：8 March, 2012
• 年：2012
• 卷：73
• 期：5
• 页码：951-961
• 全文大小：1916 K

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ass=""h3"">Summary

Ion fluxes mediated by glial cells are required for several physiological processes such as fluid homeostasis or the maintenance of low extracellular potassium during high neuronal activity. In mice, the disruption of the Cl?/sup> channel ClC-2 causes fluid accumulation leading to myelin vacuolation. A similar vacuolation phenotype is detected in humans affected with megalencephalic leukoencephalopathy with subcortical cysts (MLC), a leukodystrophy which is caused by mutations in MLC1 or GLIALCAM. We here identify GlialCAM as a ClC-2 binding partner. GlialCAM and ClC-2 colocalize in Bergmann glia, in astrocyte-astrocyte junctions at astrocytic endfeet around blood vessels, and in myelinated fiber tracts. GlialCAM targets ClC-2 to cell junctions, increases ClC-2 mediated currents, and changes its functional properties. Disease-causing GLIALCAM mutations abolish the targeting of the channel to cell junctions. This work describes the first auxiliary subunit of ClC-2 and suggests that ClC-2 may play a role in the pathology of MLC disease.

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