| Effect of different FSH isoforms on cyclic-AMP production by mouse cumulus-oocyte-complexes: a time course study. | |
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MedLine Citation:
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PMID: 11160838 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The ability of different isoforms of follicle stimulating hormone (FSH) to induce accumulation of cAMP in cultured mouse cumulus-oocyte-complexes (COC) was evaluated in a time course study. Using isoform fractions representing less acidic (pI 6.43-5.69), mid-acidic (pI 5.62-4.96) and acidic (pI 4.69-3.75) isoforms, the accumulation of cAMP was monitored after an exposure time of 0, 5, 10, 15, 30, 60, 120 and 180 min. In addition, cAMP production was monitored for 0, 5, 10, 15 and 30 min following a 5 min exposure to FSH isoform fractions. Based on FSH measurements using radioimmunoassays, the less and mid-acidic isoforms caused almost twice as much cAMP to be accumulated than the acidic isoform fraction, thereby confirming an enhanced biological activity of FSH isoforms with a isoelectric point (pI) of >5.0. For all isoform fractions, maximal accumulation of cAMP was achieved after 30 min of exposure, after which the production declined to background levels. After a 5 min exposure to isoform fractions, levels of cAMP were significantly higher in the less acidic isoform fractions, but after isoform removal, the decline in cAMP production to background levels followed a similar time course. The results demonstrate that FSH isoforms with a pI of >5.0 induced significant biological responses within a period of 30 min and that prolonged exposure caused attenuated signal transduction. The present results, set in the context of the pulsatile characteristics of FSH release from the pituitary and the reported half-life of less acidic isoforms of approximately 35 min, make it conceivable that isoforms with a pI >5.0 actually possess important physiological functions during the periovulatory period. |
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Authors:
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C Y Andersen; L Leonardsen; A Ulloa-Aguirre; J Barrios-De-Tomasi; K S Kristensen; A G Byskov |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Molecular human reproduction Volume: 7 ISSN: 1360-9947 ISO Abbreviation: Mol. Hum. Reprod. Publication Date: 2001 Feb |
Date Detail:
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Created Date: 2001-02-22 Completed Date: 2001-04-26 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9513710 Medline TA: Mol Hum Reprod Country: England |
Other Details:
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Languages: eng Pagination: 129-35 Citation Subset: IM |
Affiliation:
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Laboratory of Reproductive Biology, Section 5712, Juliane Marie Center for Children, Women and Reproduction, University Hospital of Copenhagen, Blegdamsvej 9, DK-2100 Copenhagen, Denmark. yding@rh.dk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cyclic AMP / biosynthesis* Female Follicle Stimulating Hormone / chemistry, pharmacology*, physiology Follicular Phase / physiology Isoelectric Point Kinetics Mice Mice, Inbred C57BL Oocytes / drug effects*, metabolism* Ovary / cytology, drug effects, metabolism Protein Isoforms / chemistry, pharmacology, physiology |
| Chemical | |
Reg. No./Substance:
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0/Protein Isoforms; 60-92-4/Cyclic AMP; 9002-68-0/Follicle Stimulating Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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