Mouse monoclonal antibody

Antigen/Purification: ExpandCollapse

The antigen is a phosphopeptide corresponding to amino acid residues surrounding the phosphoSer294 of human progesterone receptor.

The antibody is prepared by affinity purification using a Protein G column.

Biological Significance: ExpandCollapse

There is accumulating evidence to suggest that progesterone plays an essential role in the regulation of growth and differentiation of mammary glands and thus may play a key role in breast cancer (Edwards, 2005). The biological response to progesterone is mediated by two distinct forms of the human progesterone receptor (PR-A and PR-B forms). In most cell contexts, the B form functions as a transcriptional activator, whereas the A form functions as a transcriptional inhibitor of steroid hormones (Attia et al., 2000; Lin et al., 2003). Recently it has been demonstrated that there is differential hormone dependent regulation of the phosphorylation of the A and B forms of the receptor (Clemm et al., 2000) . Treatment of T47D breast cancer cells with progestin agonist increases the phosphorylation of Ser¹⁹⁰ and Ser²⁹⁴ with different kinetics. These phosphorylation events may differentially affect the transcriptional activity of the receptor.

Storage

100 µl in 10 mM HEPES (pH 7.5), 150 mM NaCl, 100 µg per ml BSA and 50% glycerol. Adequate amount of material to conduct 10-mini Western Blots.

For long term storage –20° C is recommended. Stable at –20° C for at least 1 year.

General References

Attia GR, Zeitoun K, Edwards D, Johns A, Carr BR, Bulun SE (2000) Progesterone receptor isoform A but not B is expressed in endometriosis. J Clin Endocrinol Metab 85:2897-2902. Clemm DL, Sherman L, Boonyara tanakornkit V, Schrader WT, Weigel NL, Edwards DP (2000) Differential hormone-dependent phosphorylation of progesterone receptor A and B forms revealed by a phosphoserine site-specific monoclonal antibody. Mol Endocrinol 14:52-65.

Edwards DP (2005) Regulation of signal transduction pathways by estrogen and progesterone. Annu Rev Physiol 67:335-376. Lin VC, Woon CT, Aw SE, Guo C (2003) Distinct molecular pathways mediate progesterone-induced growth inhibition and focal adhesion. Endocrinology 144:5650-5657

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