The Role of Luteinizing Hormone in Regulating Gene Expression During Selection of a Dominant Follicle in Cattle

At approximately 8.5 mm in diameter, the future dominant follicle is "selected" for continued growth in cattle. In the present study, cows were treated with a gonadotropin-releasing hormone receptor antagonist, acyline, just before follicle selection (near 7.8 mm) to investigate the role o...

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Veröffentlicht in:Biology of reproduction 2011-02, Vol.84 (2), p.369-378
Hauptverfasser: WENXIANG LUO, GUMEN, Ahmet, HAUGHIAN, James M, WILTBANK, Milo C
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GUMEN, Ahmet
HAUGHIAN, James M
WILTBANK, Milo C
description At approximately 8.5 mm in diameter, the future dominant follicle is "selected" for continued growth in cattle. In the present study, cows were treated with a gonadotropin-releasing hormone receptor antagonist, acyline, just before follicle selection (near 7.8 mm) to investigate the role of LH in changing mRNA concentrations during selection of a dominant follicle. The ovaries containing the expected dominant follicle (EDF; first largest follicle) and expected largest subordinate follicle (ESF) were removed after 12 or 24 h of treatment. Real-time PCR was used to determine mRNA concentrations. ELISA was used to measure testosterone and 17beta-estradiol (E(2)) and radioimmunoassay to measure androstenedione (A(4)) in follicular fluid. Concentrations of E(2) were greater in EDF than in ESF of untreated cows near the time of follicle selection (12 h) or at 12 h after selection (24 h). Testosterone, E(2), and A(4) were all dramatically decreased by acyline treatment at both times. In theca cells, acyline treatment reduced CYP17A1 (P450 17alpha) in EDF and STAR (steroidogenic acute regulatory protein) in both EDF and ESF but did not alter CYP11A1 (P450scc). In granulosa cells (GCs), LHCGR (luteinizing hormone [LH] receptor) was much greater in EDF than in ESF at both time of selection (739% greater) and 12 h after selection (2837% greater) and was decreased by acyline in EDF (87% decrease). The mRNA for CYP19A1 (cytochrome P450 aromatase) and PAPPA (pregnancy-associated plasma protein-A) tended to be greater in EDF than in ESF at follicle selection, and both mRNAs were much greater at 12 h after selection, with acyline significantly decreasing PAPPA mRNA after 24 h of treatment. The mRNA for FSHR (follicle-stimulating hormone receptor) was not different in EDF versus ESF and was not altered by acyline. Thus, induction of LHCGR mRNA in GCs is an early event during the follicle selection process, and surprisingly, expression of LHCGR mRNA is dependent on circulating LH. Production of follicular A(4), testosterone, and E(2) are also acutely related to LH but due to changes in expression of STAR and CYP17A1 in TC.
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In the present study, cows were treated with a gonadotropin-releasing hormone receptor antagonist, acyline, just before follicle selection (near 7.8 mm) to investigate the role of LH in changing mRNA concentrations during selection of a dominant follicle. The ovaries containing the expected dominant follicle (EDF; first largest follicle) and expected largest subordinate follicle (ESF) were removed after 12 or 24 h of treatment. Real-time PCR was used to determine mRNA concentrations. ELISA was used to measure testosterone and 17beta-estradiol (E(2)) and radioimmunoassay to measure androstenedione (A(4)) in follicular fluid. Concentrations of E(2) were greater in EDF than in ESF of untreated cows near the time of follicle selection (12 h) or at 12 h after selection (24 h). Testosterone, E(2), and A(4) were all dramatically decreased by acyline treatment at both times. 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Thus, induction of LHCGR mRNA in GCs is an early event during the follicle selection process, and surprisingly, expression of LHCGR mRNA is dependent on circulating LH. Production of follicular A(4), testosterone, and E(2) are also acutely related to LH but due to changes in expression of STAR and CYP17A1 in TC.</description><subject>Androstenedione - metabolism</subject><subject>Animals</subject><subject>Aromatase - genetics</subject><subject>Biological and medical sciences</subject><subject>Cattle</subject><subject>Drug Administration Schedule</subject><subject>Enzyme-Linked Immunosorbent Assay</subject><subject>Estradiol - metabolism</subject><subject>Female</subject><subject>Follicular Fluid - metabolism</subject><subject>Fundamental and applied biological sciences. 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In the present study, cows were treated with a gonadotropin-releasing hormone receptor antagonist, acyline, just before follicle selection (near 7.8 mm) to investigate the role of LH in changing mRNA concentrations during selection of a dominant follicle. The ovaries containing the expected dominant follicle (EDF; first largest follicle) and expected largest subordinate follicle (ESF) were removed after 12 or 24 h of treatment. Real-time PCR was used to determine mRNA concentrations. ELISA was used to measure testosterone and 17beta-estradiol (E(2)) and radioimmunoassay to measure androstenedione (A(4)) in follicular fluid. Concentrations of E(2) were greater in EDF than in ESF of untreated cows near the time of follicle selection (12 h) or at 12 h after selection (24 h). Testosterone, E(2), and A(4) were all dramatically decreased by acyline treatment at both times. In theca cells, acyline treatment reduced CYP17A1 (P450 17alpha) in EDF and STAR (steroidogenic acute regulatory protein) in both EDF and ESF but did not alter CYP11A1 (P450scc). In granulosa cells (GCs), LHCGR (luteinizing hormone [LH] receptor) was much greater in EDF than in ESF at both time of selection (739% greater) and 12 h after selection (2837% greater) and was decreased by acyline in EDF (87% decrease). The mRNA for CYP19A1 (cytochrome P450 aromatase) and PAPPA (pregnancy-associated plasma protein-A) tended to be greater in EDF than in ESF at follicle selection, and both mRNAs were much greater at 12 h after selection, with acyline significantly decreasing PAPPA mRNA after 24 h of treatment. The mRNA for FSHR (follicle-stimulating hormone receptor) was not different in EDF versus ESF and was not altered by acyline. Thus, induction of LHCGR mRNA in GCs is an early event during the follicle selection process, and surprisingly, expression of LHCGR mRNA is dependent on circulating LH. Production of follicular A(4), testosterone, and E(2) are also acutely related to LH but due to changes in expression of STAR and CYP17A1 in TC.</abstract><cop>Madison, WI</cop><pub>Society for the Study of Reproduction</pub><pmid>20962252</pmid><doi>10.1095/biolreprod.110.085274</doi><tpages>10</tpages></addata></record>
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subjects Androstenedione - metabolism
Animals
Aromatase - genetics
Biological and medical sciences
Cattle
Drug Administration Schedule
Enzyme-Linked Immunosorbent Assay
Estradiol - metabolism
Female
Follicular Fluid - metabolism
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation
Gonadotropin-Releasing Hormone - antagonists & inhibitors
Granulosa Cells - metabolism
Luteinizing Hormone - blood
Oligopeptides - administration & dosage
Osmolar Concentration
Ovarian Follicle - cytology
Ovarian Follicle - metabolism
Ovarian Follicle - physiology
Ovary - cytology
Ovulation - physiology
Phosphoproteins - genetics
Polymerase Chain Reaction - methods
Pregnancy-Associated Plasma Protein-A - genetics
Radioimmunoassay
Receptors, FSH - genetics
Receptors, FSH - metabolism
Receptors, LH - genetics
Receptors, LH - metabolism
RNA, Messenger - metabolism
Steroid 17-alpha-Hydroxylase - genetics
Testosterone - metabolism
Theca Cells - drug effects
Theca Cells - metabolism
Vertebrates: reproduction
title The Role of Luteinizing Hormone in Regulating Gene Expression During Selection of a Dominant Follicle in Cattle
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