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Molecular Human Reproduction, Vol. 5, No. 5, 481-486, May 1999
© 1999 European Society of Human Reproduction and Embryology

Progesterone receptor expression in the human placenta

Y. Gopi Shanker and A. Jagannadha Rao1

Department of Biochemistry and Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560 012, India

The presence of progesterone receptors (PR) in the human placenta has been demonstrated using the reverse transcriptase–polymerase chain reaction technique. It was observed that the amount of PR in the human placenta is less during late gestation. Electrophoretic mobility shift assays with nuclear extract isolated from the first trimester and term placenta revealed three complexes when incubated with [32P]dCTP-labelled progesterone response element, and, in competition with unlabelled progesterone response element, the formation of all three complexes was inhibited. When supershift analysis of these complexes was carried out using antibodies which cross-react with both the A and B types of the PR or only with the B type receptor, only the A-form of PR was detected in the human placenta.

electrophoretic mobility shift assay/placenta/PR monoclonal antibody/progesterone receptor/RT–PCR

1 To whom correspondence should be addressed at: Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India


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