Authors: Stephanie Deasey Shobana Shanmugasundaram Maria Nurminskaya
Publish Date: 2011/12/23
Volume: 44, Issue: 1, Pages: 179-187
Abstract
Of the eight catalytic transglutaminases TGs transglutaminase 2 TG2 has been the most comprehensively studied due to its ubiquitous expression in multiple cell types Despite the observed critical role for this enzyme in multiple biological processes in vitro TG2 knockout mouse models have shown no severe developmental phenotypes suggesting compensation by other TGs To begin characterization of the compensating mechanisms we analyzed total transamidating activity and expression patterns of all catalytically active TGs in seven different tissues/organs from wildtype and TG2 knockout mice Inhibitory analysis with TG2specific inhibitor KCC009 suggests that relative contribution of TG2 in total transamidating activity differs in various tissues Accordingly our data indicate tissuespecific mechanisms of compensation for the loss of TG2 including transcriptional compensation in heart and liver versus functional compensation in aorta kidney and skeletal/cartiagenous tissues On the contrary no compensation has been detected in skeletal muscle suggesting a limited role for the TG2mediated transamidation in normal development of this tissueWe would like to thank Dr Chaitan Khosla for providing us with the TG inhibitor KCC009 and Dr Robert Graham for providing us with TG2−/− mice This work was supported by NIH grants R01R01HL093305 R56DK071920 and R03AR057126 and a grant from Maryland Stem Cell Research Fund to M Nurminskaya
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