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Caspase-1-induced calpastatin degradation in myoblast differentiation and fusion: cross-talk between the caspase and calpain systems.

Authors: Barnoy, S  Kosower, NS 
Citation: Barnoy S and Kosower NS, FEBS Lett 2003 Jul 10;546(2-3):213-7.
Pubmed: (View Article at PubMed) PMID:12832042

Previously, we found that calpastatin diminished transiently prior to myoblast fusion (rat L8 myoblasts), allowing calpain-induced protein degradation, required for fusion. Here we show that the transient diminution in calpastatin is due to its degradation by caspase-1. Inhibition of caspase-1 prevents calpastatin diminution and prevents myoblast fusion. Caspase-1 activity is transiently increased during myoblast differentiation. Both calpain and caspase appear to be responsible for the fusion-associated membrane protein degradation. Caspase-1 has been implicated in the activation of proinflammatory cytokines, and in cell apoptosis. The involvement of caspase-1 in L8 myoblast fusion represents a novel function for this caspase in a non-apoptotic differentiation process, and points to cross-talk between the calpain and caspase systems in some differentiation processes.


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CRRD Object Information
CRRD ID: 1298731
Created: 2004-06-01
Species: All species
Last Modified: 2006-04-25
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.