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. 2001 Jan 26;104(2):205-15.
doi: 10.1016/s0092-8674(01)00206-9.

Loss of the ClC-7 chloride channel leads to osteopetrosis in mice and man

U Kornak  1 , D Kasper, M R Bösl, E Kaiser, M Schweizer, A Schulz, W Friedrich, G Delling, T J Jentsch
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Free article

Loss of the ClC-7 chloride channel leads to osteopetrosis in mice and man

U Kornak et al. Cell. .
Free article

Abstract

Chloride channels play important roles in the plasma membrane and in intracellular organelles. Mice deficient for the ubiquitously expressed ClC-7 Cl(-) channel show severe osteopetrosis and retinal degeneration. Although osteoclasts are present in normal numbers, they fail to resorb bone because they cannot acidify the extracellular resorption lacuna. ClC-7 resides in late endosomal and lysosomal compartments. In osteoclasts, it is highly expressed in the ruffled membrane, formed by the fusion of H(+)-ATPase-containing vesicles, that secretes protons into the lacuna. We also identified CLCN7 mutations in a patient with human infantile malignant osteopetrosis. We conclude that ClC-7 provides the chloride conductance required for an efficient proton pumping by the H(+)-ATPase of the osteoclast ruffled membrane.

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