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Optimization of spatiotemporal gene inactivation in mouse heart by oral application of tamoxifen citrate.

Genesis 45, 11-16 (2007)
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Inducible and tissue-specific gene inactivation in mice has become a powerful tool to bypass embryonic and postnatal lethality of knockout mice. The most frequently used inducible system is based on Cre recombinase fused to either one or two mutated estrogen receptor ligand binding domains, thus rendering Cre function tamoxifen-dependent. To achieve Cre-mediated inactivation of a given gene, 4-OH tamoxifen (4-OHT) dissolved either in alcohol and/or oil is usually administered by repeated intraperitoneal (i.p.) injections. Since this procedure imposes considerable stress on mice, we compared the effect of tamoxifen citrate, mixed into a standard mouse diet at different concentrations, with that of i.p. administration of 4-OHT on Cre-mediated, heart-specific inactivation of thioredoxin reductase 2. Here we show that tamoxifen citrate in the chow was equally effective as 4-OHT given i.p. Oral tamoxifen administration is thus a convenient and cost-saving way for gene induction, and, most importantly, it reduces stress and avoids adverse effects in mice.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Cre recombinase; MerCreMer; inducible gene expression; tamoxifen citrate salt; oral administration; mitochondrial thioredoxin reductase
ISSN (print) / ISBN 1526-954X
e-ISSN 1526-968X
Quellenangaben Volume: 45, Issue: 1, Pages: 11-16 Article Number: , Supplement: ,
Publisher Wiley
Reviewing status Peer reviewed