Temporal activation of c‐Jun N‐terminal kinase in adult transgenic heart via cre‐loxP‐mediated DNA recombination
- 19 February 2003
- journal article
- fj express-summaries
- Published by Wiley in The FASEB Journal
- Vol. 17 (6), 749-751
- https://doi.org/10.1096/fj.02-0438fje
Abstract
Using a cre-loxP-mediated gene-switch approach, we achieved targeted JNK activation in adult hearts. A transgenic model is established carrying a floxed gene-switch construct that directs GFP marker gene expression in the absence of DNA recombination between two loxP sites. A tamoxifen-inducible Cre recombinase was introduced in the transgenic heart by breeding with previously established Mer-Cre-Mer transgenic mice. Upon tamoxifen administration in double transgenic adult animals, cre-loxP-mediated DNA recombination efficiently switches "off" the loxP-flanked GFP expression unit in cardiomyocytes and switches "on" the expression of the target gene, MKK7D, a constitutively activated upstream activator of c-Jun N-terminal kinases (JNK). Expression of MKK7D in adult hearts resulted in significant activation of JNK activities and causes progressive cardiomyopathy in transgenic animals. This unique animal model of cardiac-specific and temporally regulated JNK activation will provide a powerful tool to investigate the functional role of the JNK pathway in the development of heart failure. Our data also demonstrated that the inducible gene-switch approach reported here may also be applicable in other studies to achieve efficient, tissue-specific, and temporally regulated genetic manipulation in intact animals.Keywords
Funding Information
- American Heart Association
- National Institutes of Health
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