title: Regulation of parathyroid hormone-related protein gene expression in human endometrial stromal cells in culture.
abstract: The regulation of PTH-related protein (PTH-rP) gene expression by human endometrial stromal cells in monolayer culture was evaluated. 17 beta-Estradiol (E2), interleukin-1 beta (IL-1 beta), tumor necrosis factor-alpha (TNF alpha), endothelin-1 (ET-1), transforming growth factor-beta 1 (TGF beta 1), and serum stimulated PTH-rP production (evaluated by immunoassay of PTH-rP in the culture medium) by these cells. Treatment of endometrial stromal cells with E2 plus a progestin, medroxy-progesterone acetate (MPA), caused a decrease in PTH-rP production. PRL, epidermal growth factor, and dexamethasone, which are known to affect PTH-rP production (increase or decrease) in other cells, were ineffective in altering PTH-rP production in endometrial stromal cells, as were a number of other growth factors, viz. TGF alpha, platelet-derived growth factor, and basic fibroblast growth factor, and metabolites of progesterone. The effects of E2 and MPA on PTH-rP gene expression in these cells were investigated in detail. E2 (50 nM) increased PTH-rP mRNA levels (at 2, 4, 8, 12, and 24 h). When serum (10%) was present in the medium, E2 (50 nM) did not increase PTH-rP production or PTH-rP mRNA levels, and in the presence of serum, E2 plus MPA did not decrease PTH-rP production. In cells that were pretreated with E2 (50 nM) for 48 h before treatment (18 h) with ET-1, TNF alpha, tetradecanoylphorbol acetate, and TGF beta 1, the production of PTH-rP was greater than that in cells not pretreated with estrogen. The effect of treatment of endometrial stromal cells with MPA on PTH-rP mRNA levels (at 2, 4, 8, and 12 h) was variable, but in all studies conducted, PTH-rP production after 18 or 24 h of progestin treatment was not increased compared with that in nontreated cells. We conclude that estrogen acts directly in endometrial stroma cells to increase PTH-rP mRNA levels and PTH-rP protein production. In addition IL-1 beta, TNF alpha, ET-1, TGF beta 1, and serum stimulate PTH-rP production by these cells. With the exception of serum, the effects of most of the other agents identified in this study to stimulate PTH-rP production were at least additive with that of E2.
authors.affiliation: Cecil H. and Ida Green Center for Reproductive Biology Sciences, University of Texas Southwestern Medical Center, Dallas 75235-9051.
authors.forename: M L
authors.initials: ML
authors.lastname: Casey
authors.forename: M
authors.initials: M
authors.lastname: Mibe
authors.forename: P C
authors.initials: PC
authors.lastname: MacDonald
mesh_terms: D001769:Blood; D002478:Cells, Cultured; D003470:Culture Media; D004717:Endometrium / Q000378:metabolism*; D016232:Endothelins / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D017258:Medroxyprogesterone Acetate / Q000494:pharmacology; D044162:Parathyroid Hormone-Related Protein; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D003470:Culture Media; D016232:Endothelins; D007375:Interleukin-1; C470121:PTHLH protein, human; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D014409:Tumor Necrosis Factor-alpha; D004958:Estradiol; D017258:Medroxyprogesterone Acetate