Progesterone signaling

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  • Steroid hormone receptors are important drug targets and have been the focus of basic and applied research for decades. Steroid hormone receptors act as ligand-dependent transcription factors. Upon ligand binding, the receptors bind to hormone responsive cis-acting DNA elements (HREs) in the nucleus and regulate the expression of target genes by recruiting chromatin-modifying activities that either promote or deny access to the basal transcription machinery.

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  • We have shown recently that in human T lymphocytes, leptin stimulates activity and expression of the endocan-nabinoid-degrading enzyme fatty acid amide hydrolase (FAAH), through STAT3 (signal transducer and activator of transcription 3) and its CRE (cAMP response element)-like transcriptional target in the FAAH promoter [Maccar-rone, M., Di Rienzo, M., Finazzi-Agro`,A., &Rossi,A. (2003) J. Biol. Chem. 278, 13318–13324]. We have also shown that progesterone, alone or additively with leptin, up-regulates theFAAHgene in human T-cells, through the Ikaros transcription factor [Maccarrone, M.

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  • Do the cancer cells have hormone receptors? Hormone receptors are like ears on and in breast cells that listen to signals from hormones. These hormone signals tell breast cells that have the receptors to grow. A cancer is called eR-positive if it has receptors for the hormone estrogen. It’s called PR-positive if it has receptors for the hormone progesterone. Breast cells that do not have receptors are negative for these hormones. Breast cancers that are ER-positive, PR-positive, or both tend to respond to hormonal therapy.

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