| Effect of luteinizing hormone (LH), PGE2, 8-EPI-PGE1, 8-EPI-PGE2, trichosanthin, and pregnancy specific protein B (PSPB) on secretion of progesterone in vitro by corpora lutea (CL) from nonpregnant and pregnant cows. | |
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MedLine Citation:
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PMID: 9661216 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Secretion of progesterone by Day 14 bovine corpora lutea (CL) of the estrous cycle and Day 200 CL of pregnancy was evaluated in vitro to determine what regulates secretion of progesterone by CL of pregnancy. Weights of Day 200 CL of pregnancy (4356 +/- 223 g) were heavier when compared to Day 14 CL of the estrous cycle of Brahman cows (3643 +/- 128 g; p < or = 0.05); however, both Day 14 and Day 200 minced CL slices secreted similar basal amounts of progesterone per unit mass (p > or = 0.05). Secretion of progesterone in vitro by Day 14 CL of the estrous cycle was increased at 4 and 8 h (p < or = 0.05) by 10 or 100 ng/mL luteinizing hormone (LH) and did not differ between doses (p > or = 0.05). Progesterone secretion in vitro by Day 200 CL of pregnancy was not increased (p > or = 0.05) by LH at 4 or 8 h. However, progesterone secretion in vitro by Day 14 CL of the estrous cycle or Day 200 CL of pregnancy was increased (p < or = 0.05) at 4 h by 10 or 100 ng/mL PGE2, which did not differ by dose or reproductive status (p > or = 0.05). At 8 h, Day 14 CL of the estrous cycle secretion of progesterone in vitro was increased (p < or = 0.05) by both doses of PGE2 but only at 8 h by 100 ng/mL from Day 200 CL of pregnancy (p < or = 0.05). Secretion of progesterone in vitro was not affected (p > or = 0.05) by 10 or 100 ng/mL 8-Epi-PGE1 or 8-Epi-PGE2 at 4 or 8 h from Day 14 CL of the estrous cycle or Day 200 of pregnancy. Trichosanthin increased (p < or = 0.05) secretion of progesterone in vitro by 10 ng/mL at 4 h and at 8 h by Day 14 CL of the estrous cycle or at 8 h by Day 200 CL of pregnancy but trichosanthin at 100 ng/mL did not affect (p > or = 0.05) secretion of progesterone in vitro by Day 14 CL of the estrous cycle or Day 200 CL of pregnancy at 4 or 8 h. Pregnancy specific protein B (PSPB) increased (p < or = 0.05) secretion of progesterone in vitro at 4 and 8 h by Day 14 CL of the estrous cycle and did not differ between incubation times (p > or = 0.05). PSPB increased secretion of progesterone at 4 h but not at 8 h (p > or = 0.05) by Day 200 CL of pregnancy. These data suggest that PGE2 or PSPB but not LH, 8-Epi-PGE1 or 8-Epi-PGE2 regulates luteal secretion of progesterone by bovine CL at mid-pregnancy. In addition, it is suggested that weights of bovine CL of pregnancy increase to compensate for a lack of placental secretion of progesterone. |
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Authors:
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Y S Weems; M A Lammoglia; H R Vera-Avila; R D Randel; C King; R G Sasser; C W Weems |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Prostaglandins & other lipid mediators Volume: 55 ISSN: 1098-8823 ISO Abbreviation: Prostaglandins Other Lipid Mediat. Publication Date: 1998 Jan |
Date Detail:
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Created Date: 1998-09-18 Completed Date: 1998-09-18 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 9808648 Medline TA: Prostaglandins Other Lipid Mediat Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 27-42 Citation Subset: IM; X |
Affiliation:
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Department of Animal Sciences, University of Hawaii, Honolulu 96822, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Aspartic Acid Endopeptidases / pharmacology* Cattle Corpus Luteum / drug effects*, secretion Estrus Female Luteinizing Hormone / pharmacology* Pregnancy Pregnancy Proteins / pharmacology* Progesterone / secretion* Prostaglandins E / pharmacology* Trichosanthin / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Pregnancy Proteins; 0/Prostaglandins E; 57-83-0/Progesterone; 60318-52-7/Trichosanthin; 9002-67-9/Luteinizing Hormone; EC 3.4.23.-/Aspartic Acid Endopeptidases; EC 3.4.23.-/pregnancy-associated glycoprotein 1 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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