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Preparation of monoclonal antibodies to the avian progesterone receptor


, : Preparation of monoclonal antibodies to the avian progesterone receptor. Endocrinology 119(4): 1549-1557

In an effort to obtain additional probes for analysis of the avian progesterone receptor, this receptor was isolated and used to prepare several monoclonal antibodies. Progesterone receptor purified from oviduct cytosol by chromatography on deoxycorticosterone-Separose and heparin-agarose was used as the immunizing antigen. Twenty-nine hybridoma cultures which tested positive in an enzyme-linked immunosorbent assay against the receptor preparation were subcloned resulting in establishment of 12 stable cell lines. Of these, 5 produced antibodies capable of complexing receptor-bound progesterone from cytosol as measured by adsorption of receptor-antibody complexes onto antimouse immunoglobulin G-agarose. Each was used to generate ascites and the purified antibodies were designated .alpha.PRL 6, 11, 13, 16, and 22. In addition to precipitating receptor-bound progesterone from cytosol, the antibodies were also effective in increasing the sedimentation velocity of progesterone receptor centrifugated on glycerol gradients, and recognizing receptor proteins that were resolved by denaturing gel electrophoresis and transferred to nitrocellulose (Western blots). Immunoisolation of receptor was also demonstrated using receptor labeled covalently with the synthetic progestin, R5020. The antibodies were specific for progesterone receptor and did not cross-react with estrogen receptor from the oviduct or glucocorticoid receptor from chick liver. Two antibodies, .alpha.PRL 6 and .alpha.PR 22, also recognized some mammalian forms of the progesterone receptor. Both antibodies reacted with progesterone receptor from the rabbit uterus and .alpha.PR 6 recognized human progesterone receptor. Four of the antibodies recognized both A and B forms of the avian receptor while .alpha.PR6 was specific for the B form.

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Accession: 006173514

PMID: 2428599

DOI: 10.1210/endo-119-4-1549

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