dc.contributor.advisor | Spicer, Leon J. | |
dc.contributor.author | Aad, Pauline Y. | |
dc.date.accessioned | 2014-04-15T18:37:00Z | |
dc.date.available | 2014-04-15T18:37:00Z | |
dc.date.issued | 2005-05-01 | |
dc.identifier.uri | https://hdl.handle.net/11244/8411 | |
dc.description.abstract | PAPP-A degrades IGFBPs in the ovary, and increases availability of IGFs. The objective of this study was to determine the effect of IGF-s, insulin, LH, FSH, estradiol, leptin or cortisol on ovarian PAPP-A mRNA in small- (SM) and large- (LG) follicle granulosa (GC) and LG theca (TC) cells. More PAPP-A mRNA was produced by GC than TC, but none of the treatments affected (P>0.10) PAPP-A mRNA in SM-GC and LG-GC. In LG-TC, insulin with or without LH decreased (P<0.05) PAPP-A mRNA; estradiol alone decreased PAPP-A mRNA and amplified the insulin-induced inhibition of PAPP-A mRNA expression. We conclude that PAPP-A gene expression is differentially regulated in granulosa and theca cells. Estradiol and insulin may act as negative feedback regulators to prevent excessive IGF-I - induced androgen production, and prevent excessive estradiol production by GC via decreased thecal PAPP-A production, maintaining desirable levels of IGFBP-4/-5 and subsequently free IGF-I /-II within the follicle. | |
dc.format | application/pdf | |
dc.language | en_US | |
dc.publisher | Oklahoma State University | |
dc.rights | Copyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material. | |
dc.title | Real-time Rt-pcr Quantification of Pregnancy-associated Plasma Protein-A Gene Expression in Granulosa and Theca Cells: Effects of Hormones in Vitro | |
dc.type | text | |
dc.contributor.committeeMember | Wettemann, Robert Paul | |
dc.contributor.committeeMember | DeSilva, Udaya | |
osu.filename | AAD_okstate_0664M_1358.pdf | |
osu.college | Agricultural Sciences and Natural Resources | |
osu.accesstype | Open Access | |
dc.description.department | Department of Animal Science | |
dc.type.genre | Thesis | |
dc.subject.keywords | insulin-like growth factor binding protein (igfbp) | |
dc.subject.keywords | granulosa cell | |
dc.subject.keywords | theca cell | |
dc.subject.keywords | pregnancy-associated plasma protein-a (papp-a) | |