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Ovine prostaglandin F2α receptor

Steroid influence on steady-state levels of luteal mRNA

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Abstract

Expression of the receptor for prostaglandin F2α (PGF2α) is decreased in the ovine corpus luteum during regression and increased in early pregnancy. This study was designed to evaluate the influence of progesterone and/or 17β-estradiol (E2) on this regulation. Circulating progesterone (functional regression) and luteal PGF receptor mRNA decreased (p<0.05) within 8 h of PGF2α-induced luteal regression in midluteal phase (day 10; d 10) ewes; however, internucleosomal DNA fragmentation (structural regression) was not yet increased. Additionally, luteal PGF receptor mRNA and circulating progesterone were greater (p<0.05) in pregnant than in nonpregnant ewes on d 14, but not on d 12. Twelve hours following injection of d 10 ewes with E2, steady-state levels of mRNA for PGF receptor were decreased (p<0.05), although circulating progesterone and DNA laddering were unchanged. Conversely, luteal mRNA for PGF receptor was increased (p<0.05) by E2 treatment in hysterectomized ewes. These results provide evidence that (1) luteal PGF receptor expression parallels circulating progesterone levels during functional regression and in early pregnancy, but (2) expression of PGF receptor can be dissociated from alterations in circulating progesterone by injection with E2. Additionally, decreased PGF receptor expression initiated by E2 is uterine-dependent, whereas the direct luteal effect (hysterectomized ewes) of E2 is a stimulation of PGF receptor expression. These results collectively support the belief that the apparent downregulation of PGF receptor during luteal regression is associated with uterine-derived PGF2α and its intracellular effects rather than with alterations in ovarian steroid production.

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Authors and Affiliations

  1. Department of Physiology, the University of Arizona, 85724, Tucson, AZ

    Patricia B. Hoyer PhD., Samuel L. Marion, Ian Stine & Debora L. Hamernik

  2. Department of Pharmacology and Toxicology, the University of Arizona, 85724, Tucson, AZ

    John W. Regan

  3. Department of Animal Sciences, the University of Arizona, 85724, Tucson, AZ

    Mark E. Wise

  4. The Women’s Research Institute, Department of Obstetrics and Gynecology, University of Kansas School of Medicine, Wichita, KS

    Bo R. Rueda

Authors
  1. Patricia B. Hoyer PhD.
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  2. Samuel L. Marion
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  3. Ian Stine
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  4. Bo R. Rueda
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  5. Debora L. Hamernik
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  6. John W. Regan
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  7. Mark E. Wise
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Correspondence to Patricia B. Hoyer PhD..

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Hoyer, P.B., Marion, S.L., Stine, I. et al. Ovine prostaglandin F2α receptor. Endocr 10, 105–111 (1999). https://doi.org/10.1385/ENDO:10:2:105

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  • DOI: https://doi.org/10.1385/ENDO:10:2:105

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