Abstract
The ability of a 470 bp sub-fragment of the murine whey acidic protein (WAP) promoter in the context of a retroviral expression plasmid to direct gene expression to mammary epithelial cells was analysed in a number of independent transgenic mouse lines. In contrast to previous findings with the genuine 2.5 kb promoter fragment, our studies revealed a highly mammary gland-specific expression detectable only in non-lactating animals. This suggested a mainly progesterone-regulated activity of the short fragment. Therefore, transgene expression was examined in the progesterone-determined estrous cycle and during pregnancy. In accordance with in vitrodata from stably transfected cell lines, in both situations expression was upregulated at stages associated with high progesterone levels. Taken together these data provide deeper insight into WAP-promoter regulation and stress the usefulness of the shortened fragment for a lactation independent mammary-targeted expression.
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Lipnik, K., Petznek, H., Renner-Müller, I. et al. A 470 bp WAP-promoter fragment confers lactation independent, progesterone regulated mammary-specific gene expression in transgenic mice. Transgenic Res 14, 145–158 (2005). https://doi.org/10.1007/s11248-004-7434-8
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DOI: https://doi.org/10.1007/s11248-004-7434-8