Lysosomal Pathology and Osteopetrosis upon Loss of H+-Driven Lysosomal Cl- Accumulati

S. Weinert, S. Jabs, C. Supanchart, M. Schweizer, N. Gimber, M. Richter, J. Rademann, T. Stauber, U. Kornak, T. J. Jentsch – 2010

During lysosomal acidification, proton-pump currents are thought to be shunted by a chloride ion (Cl–) channel, tentatively identified as ClC-7. Surprisingly, recent data suggest that ClC-7 instead mediates Cl–/proton (H+) exchange. We generated mice carrying a point mutation converting ClC-7 into an uncoupled (unc) Cl– conductor. Despite maintaining lysosomal conductance and normal lysosomal pH, these Clcn7unc/unc mice showed lysosomal storage disease like mice lacking ClC-7. However, their osteopetrosis was milder, and they lacked a coat color phenotype. Thus, only some roles of ClC-7 Cl–/H+ exchange can be taken over by a Cl– conductance. This conductance was even deleterious in Clcn7+/unc mice. Clcn7–/– and Clcn7unc/unc mice accumulated less Cl– in lysosomes than did wild-type mice. Thus, lowered lysosomal chloride may underlie their common phenotypes.

Titel
Lysosomal Pathology and Osteopetrosis upon Loss of H+-Driven Lysosomal Cl- Accumulati
Verfasser
S. Weinert, S. Jabs, C. Supanchart, M. Schweizer, N. Gimber, M. Richter, J. Rademann, T. Stauber, U. Kornak, T. J. Jentsch
Datum
2010
Kennung
10.1126/science.1188072
Zitierweise
Science 2010, 1401-1403
Art
Text
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