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Distinct Functional Differences of Human Progesterone Receptors A and B on Gene Expression and Growth Regulation in Two Endometrial Carcinoma Cell Lines

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The Journal of the Society for Gynecologic Investigation: JSGI Aims and scope Submit manuscript

Abstract

Objective

TO study the functional differences between the two progesterone receptor isoforms (hPRA and hPRB) in human endometrial cancer, two new endometrial carcinoma cell lines were created—one expressing hPHA and one expressing hPRB.

Methods

A well-differentiated, hPR-negative Ishikawa cell line was stably transfected with either hPRA or hPRB cDNA. Transfected cells were selected, and two cell lines expressing approximately equal amounts of receptor were isolated—one expressing hPRA (PRA-14) and one expressing hPRB (PRB-59).

Results

Cell growth experiments revealed a growth-inhibitory response to progestins (MPA and R5020) in the PRB-59 cells but not in the PRA-14 cells. Differences in expression of genes targeted by the two isoforms were studied using a cDNA expression array technique. A different set of genes appeared to be progesterone regulated in the PRA-14 cells than in the PRB-59 cells. None of the genes were regulated by both hPRA and hPRB. Insulin-like growth factor binding protein 3 expression was studied in more detail as an example of a gene regulated in PRB-59 cells but not in PRA-14 cells.

Conclusion

We established a new model to study functional differences between the two hPR isoforms in human endometrial carcinoma cells. This model revealed distinctive differences in target gene regulation between the two hPR isoforms. Moreover, antiproliferative actions of progesterone on human endometrial cancer cells could be observed only in the PRB-expressing cell line.

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Correspondence to Ellen Smid-Koopman MD, PhD.

Additional information

This work was supported by a grant from The Netherlands Organization for Scientific Research (NWO 903-46-169).

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Smid-Koopman, E., Blok, L.J., Kühne, L.C.M. et al. Distinct Functional Differences of Human Progesterone Receptors A and B on Gene Expression and Growth Regulation in Two Endometrial Carcinoma Cell Lines. Reprod. Sci. 10, 49–57 (2003). https://doi.org/10.1016/S1071-5576(02)00217-4

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  • DOI: https://doi.org/10.1016/S1071-5576(02)00217-4

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