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Estrogen targets genes involved in protein processing, calcium homeostasis, and Wnt signaling in the mouse uterus independent of estrogen receptor-alpha and -beta



Estrogen targets genes involved in protein processing, calcium homeostasis, and Wnt signaling in the mouse uterus independent of estrogen receptor-alpha and -beta



Journal of Biological Chemistry 275(37): 28834-28842



Estrogen actions in target organs are normally mediated via activation of nuclear estrogen receptors (ERs). By using mRNA differential display technique, we show, herein, that estradiol-17beta (E(2)) and its catechol metabolite 4-hydroxy-E(2) (4OHE(2)) can modulate uterine gene expression in ERalpha(-/-) mice. Whereas administration of E(2) or 4OHE(2) rapidly up-regulated (4-8-fold) the expression of immunoglobulin heavy chain binding protein (Bip), calpactin I (CalP), calmodulin (CalM), and Sik similar protein (Sik-SP) genes in ovariectomized wild-type or ERalpha(-/-) mice, the expression of secreted frizzled related protein-2 (SFRP-2) gene was down-regulated (4-fold). Bip, CalP, and CalM are calcium-binding proteins and implicated in calcium homeostasis, whereas SFRP-2 is a negative regulator of Wnt signaling. Bip and Sik-SP also possess chaperone-like functions. Administration of ICI-182,780 or cycloheximide failed to influence these estrogenic responses, demonstrating that these effects occur independent of ERalpha, ERbeta, or protein synthesis. In situ hybridization showed differential cell-specific expression of these genes in wild-type and ERalpha(-/-) uteri. Although progesterone can antagonize or synergize estrogen actions, it had minimal effects on these estrogenic responses. Collectively, the results demonstrate that estrogens have a unique ability to influence specific genes in the uterus not involving classical nuclear ERs.

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Accession: 010608164

Download citation: RISBibTeXText

PMID: 10893236

DOI: 10.1074/jbc.m003827200


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