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Pagliarani S, Palmieri C, McGowan M, Carrick F, Boyd J, Johnston SD. Anatomy of the Female Koala Reproductive Tract. BIOLOGY 2023; 12:1445. [PMID: 37998044 PMCID: PMC10669549 DOI: 10.3390/biology12111445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/08/2023] [Accepted: 11/14/2023] [Indexed: 11/25/2023]
Abstract
The koala (Phascolarctos cinereus), while being an iconic Australian marsupial, has recently been listed as endangered. To establish an improved understanding of normal reproductive anatomy, this paper brings together unpublished research which has approached the topic from two perspectives: (1) the establishment of an artificial insemination program, and (2) the definition of Chlamydia spp.-derived histopathological changes of the female koala urogenital system. Based on the presentation and histological processing of over 70 opportunistic specimens, recovered from wildlife hospitals in Southeast Queensland (Australia), we describe the gross and microanatomy of the koala ovary, oviduct, uteri, vaginal complex, and urogenital sinus during the interestrous, proliferative, and luteal phases of the reproductive cycle.
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Affiliation(s)
- Sara Pagliarani
- Ontario Veterinary College, The University of Guelph, Guelph, ON N1G 2W1, Canada
- School of Veterinary Science, The University of Queensland, Gatton 4343, Australia
| | - Chiara Palmieri
- School of Veterinary Science, The University of Queensland, Gatton 4343, Australia
| | - Michael McGowan
- School of Veterinary Science, The University of Queensland, Gatton 4343, Australia
| | - Frank Carrick
- School of Environment, The University of Queensland, Gatton 4343, Australia
- Sustainable Minerals Institute, Koala Study Program, The University of Queensland, St. Lucia 4072, Australia
| | - Jackson Boyd
- School of Veterinary Science, The University of Queensland, Gatton 4343, Australia
- School of Environment, The University of Queensland, Gatton 4343, Australia
| | - Stephen D. Johnston
- School of Veterinary Science, The University of Queensland, Gatton 4343, Australia
- School of Environment, The University of Queensland, Gatton 4343, Australia
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Fabre-Nys C, Chanvallon A, Dupont J, Lardic L, Lomet D, Martinet S, Scaramuzzi RJ. The "Ram Effect": A "Non-Classical" Mechanism for Inducing LH Surges in Sheep. PLoS One 2016; 11:e0158530. [PMID: 27384667 PMCID: PMC4934854 DOI: 10.1371/journal.pone.0158530] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 06/17/2016] [Indexed: 11/18/2022] Open
Abstract
During spring sheep do not normally ovulate but exposure to a ram can induce ovulation. In some ewes an LH surge is induced immediately after exposure to a ram thus raising questions about the control of this precocious LH surge. Our first aim was to determine the plasma concentrations of oestradiol (E2) E2 in anoestrous ewes before and after the “ram effect” in ewes that had a “precocious” LH surge (starting within 6 hours), a “normal” surge (between 6 and 28h) and “late» surge (not detected by 56h). In another experiment we tested if a small increase in circulating E2 could induce an LH surge in anoestrus ewes. The concentration of E2 significantly was not different at the time of ram introduction among ewes with the three types of LH surge. “Precocious” LH surges were not preceded by a large increase in E2 unlike “normal” surges and small elevations of circulating E2 alone were unable to induce LH surges. These results show that the “precocious” LH surge was not the result of E2 positive feedback. Our second aim was to test if noradrenaline (NA) is involved in the LH response to the “ram effect”. Using double labelling for Fos and tyrosine hydroxylase (TH) we showed that exposure of anoestrous ewes to a ram induced a higher density of cells positive for both in the A1 nucleus and the Locus Coeruleus complex compared to unstimulated controls. Finally, the administration by retrodialysis into the preoptic area, of NA increased the proportion of ewes with an LH response to ram odor whereas treatment with the α1 antagonist Prazosin decreased the LH pulse frequency and amplitude induced by a sexually active ram. Collectively these results suggest that in anoestrous ewes NA is involved in ram-induced LH secretion as observed in other induced ovulators.
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Affiliation(s)
- Claude Fabre-Nys
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
- * E-mail:
| | - Audrey Chanvallon
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
| | - Joëlle Dupont
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
| | - Lionel Lardic
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
| | - Didier Lomet
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
| | - Stéphanie Martinet
- UMR 7247 Physiologie de la Reproduction et des Comportements, CNRS, INRA, Université de Tours, Institut français du cheval et de l’équitation, 37380 Nouzilly, France
| | - Rex J. Scaramuzzi
- Department of Comparative Biomedical Sciences, Royal Veterinary College, Hawkshead Lane South Mimms, Hertfordshire AL9 7TA, United Kingdom
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Johnston SD, O'Callaghan P, Nilsson K, Tzipori G, Curlewis JD. Semen-induced luteal phase and identification of a LH surge in the koala (Phascolarctos cinereus). Reproduction 2004; 128:629-34. [PMID: 15509709 DOI: 10.1530/rep.1.00300] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The koala ovulates in response to mating. The purpose of this study was to document the LH surge induced by copulation and to investigate the potential roles of mechanical stimulation of the urogenital sinus and deposition of semen in induction of the luteal phase. In experiment 1, serial blood samples from four koalas that underwent normal mating showed elevated concentrations of LH approximately 24–32 h post-coitus. There was no corresponding elevation in LH in koalas (n = 4) that were exposed to the presence of a male but received no physical contact. In experiment 2, koalas on day 2 of oestrus were exposed to one of the following treatments (n = 9 per group): artificial insemination with 1 ml 0.9% sterile saline (control group), insemination with 1 ml koala semen, stimulation of the urogenital sinus with a purposebuilt glass rod (designed to mimic the action of the penis during natural mating) and urogenital stimulation with the glass rod followed by insemination of 1 ml koala semen. Confirmation of a luteal phase was based on evidence of a prolonged return to oestrus, parturition and/or elevated progesterone concentrations. Insemination of saline (0/9) and urogenital stimulation (0/9) failed to induce a luteal phase. Insemination of semen without glass rod stimulation resulted in a luteal phase in 4/9 koalas, three of which gave birth. Insemination of semen in combination with urogenital stimulation produced a luteal phase in 7/9 koalas, four of which gave birth. Semen had a significant effect on induction of the koala luteal phase (P < 0.001) but glass rod stimulation had no such effect (P = 0.335). It was concluded that semen must be involved in the induction of a luteal phase in the koala. The results presented in this study will serve to improve optimal timing and induction of ovulation for artificial insemination in the koala.
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Affiliation(s)
- S D Johnston
- School of Animal Studies, The University of Queensland, 4072, Australia.
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Caba M, Rovirosa MJ, Beyer C, González-Mariscal G. Immunocytochemical detection of progesterone receptor in the female rabbit forebrain: distribution and regulation by oestradiol and progesterone. J Neuroendocrinol 2003; 15:855-64. [PMID: 12899680 DOI: 10.1046/j.1365-2826.2003.01070.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
There is no information on the neuroanatomical distribution of the progesterone receptor (PR) in the rabbit. Therefore, we mapped the distribution of PR-immunoreactive cells in the forebrain of ovariectomized female rabbits. Vehicle-injected ovariectomized rabbits showed PR-immunoreactive cells only in the infundibular nucleus (IN) and nucleus X (lateral to the ventromedial hypothalamic nucleus). The injection of oestradiol benzoate (EB; 5 micro g/day for 5 days) increased the number of PR-immunoreactive cells in the IN and in three nuclei of the preoptic region (periventricular, medial, and principal). Abundant PR were also found in the paraventricular nucleus and nucleus X. Administration of progesterone (10 mg/day) for 3 days to EB-treated rabbits (a treatment that induces digging behaviour for the maternal nest and suppresses sexual receptivity and scent-marking) eliminated PR-immunoreactivity from all brain areas analysed except the IN. Thus, one-third of the number of cells seen in the ovariectomized + EB condition persisted in this region despite progesterone injections. Withdrawal of progesterone (and continuation of EB) for 5 (but not for 2) days (in a schedule similar to the one that induces straw-carrying and hair-pulling for the maternal nest) increased the number of PR-immunoreactive cells in all regions analysed. These results show that restricted regions of the female rabbit forebrain express abundant PR which are either: (i). up-regulated by oestradiol and down-regulated by progesterone; (ii). oestradiol-insensitive and down-regulated by progesterone; or (iii). insensitive to both oestradiol and progesterone.
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Affiliation(s)
- M Caba
- Laboratorio de Biología de la Reproducción, IIB, Universidad Veracruzana, Xalapa, México
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Abstract
GnRH is the key neuropeptide controlling reproductive function in all vertebrate species. Two different neuroendocrine mechanisms have evolved among female mammals to regulate the mediobasal hypothalamic (MBH) release of GnRH leading to the preovulatory secretion of LH by the anterior pituitary gland. In females of spontaneously ovulating species, including rats, mice, guinea pigs, sheep, monkeys, and women, ovarian steroids secreted by maturing ovarian follicles induce a pulsatile pattern of GnRH release in the median eminence that, in turn, stimulates a preovulatory LH surge. In females of induced ovulating species, including rabbits, ferrets, cats, and camels, the preovulatory release of GnRH, and the resultant preovulatory LH surge, is induced by the receipt of genital somatosensory stimuli during mating. Induced ovulators generally do not show "spontaneous" steroid-induced LH surges during their reproductive cycles, suggesting that the positive feedback actions of steroid hormones on GnRH release are reduced or absent in these species. By contrast, mating-induced preovulatory surges occasionally occur in some spontaneously ovulating species. Most research in the field of GnRH neurobiology has been performed using spontaneous ovulators including rat, guinea pig, sheep, and rhesus monkey. This review summarizes the literature concerning the neuroendocrine mechanisms controlling GnRH biosynthesis and release in females of several induced ovulating species, and whenever possible it contrasts the results with those obtained for spontaneously ovulating species. It also considers the adaptive, evolutionary benefits and disadvantages of each type of ovulatory control mechanism. In females of induced ovulating species estradiol acts in the brain to induce aspects of proceptive and receptive sexual behavior. The primary mechanism involved in the preovulatory release of GnRH among induced ovulators involves the activation of midbrain and brainstem noradrenergic neurons in response to genital-somatosensory signals generated by receipt of an intromission from a male during mating. These noradrenergic neurons project to the MBH and, when activated, promote the release of GnRH from nerve terminals in the median eminence. In contrast to spontaneous ovulators, there is little evidence that endogenous opioid peptides normally inhibit MBH GnRH release among induced ovulators. Instead, the neural signals that induce a preovulatory LH surge in these species seem to be primarily excitatory. A complete understanding of the neuroendocrine control of ovulation will only be achieved in the future by comparative studies of several animal model systems in which mating-induced as well as spontaneous, hormonally stimulated activation of GnRH neurons drives the preovulatory LH surge.
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Affiliation(s)
- J Bakker
- Department of Biology, Boston University, 5 Cummington Street, Boston, Massachusetts, 02215, USA
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Bravo PW, Fowler ME, Stabenfeldt GH, Lasley B. Endocrine responses in the llama to copulation. Theriogenology 1990; 33:891-9. [PMID: 16726785 DOI: 10.1016/0093-691x(90)90824-d] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/1989] [Accepted: 01/23/1990] [Indexed: 10/26/2022]
Abstract
Nine adult female llamas were used to determine the time course for secretion of luteinizing hormone (LH) and estradiol-17beta (E(2)) following a single copulation (average 18 min), and progesterone (P(4)) during the development of the subsequent luteal phase. Heparinized blood samples were obtained through an indwelling jugular cannula at 15-min intervals for up to 24 h following copulation and then once daily for up to 10 d. Luteinizing hormone, assayed by radioimmunoassay (RIA) using a monoclonal antibody 518B7 against the beta subunit of bovine LH, was determined at 15 min intervals for 24 h following copulation. Estradiol-17beta was determined by RIA at 4-h intervals following copulation, then daily, while P(4) values were determined daily by enzyme immunoassay. A significant increase in LH concentration was observed by 15 min after the onset of copulation, with the peak of the preovulatory surge of LH occurring at 2 h; values were basal by 7 h after copulation. Estradiol-17beta values, unchanged through 18 h after copulation, tended to decline at 22 h (24 h, P<0.10) and were significantly lower than 18 h values by 48 h (P<0.05) after copulation. The first significant P(4) increase occurred at 3 d after copulation, with values increasing through 10 d. The LH surge observed subsequent to copulation is consonant with the llama being an induced ovulator.
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Affiliation(s)
- P W Bravo
- Department of Reproduction School of Veterinary Medicine University of California, Davis Davis, CA 95616 USA
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YoungLai EV. Administration of GnRH in vivo stimulates progesterone and inhibits androgen accumulation by ovarian follicles isolated from pubertal rabbits. JOURNAL OF STEROID BIOCHEMISTRY 1985; 22:91-6. [PMID: 3919217 DOI: 10.1016/0022-4731(85)90146-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A single i.v. injection of gonadotropin releasing hormone (GnRH) to pubertal female rabbits led to an ovulatory pulse of LH but no ovulations resulted. By contrast, 5 i.v. injections over 6 h led to 1-3 ovulations in 5 of 8 animals treated. Twenty-four hours after the initial injection animals were killed and follicles isolated. Large follicles greater than 1 mm dia, from both GnRH treated groups released more progesterone during the control incubation period than those from saline treated. Small follicles less than 1 mm dia, from the same GnRH groups accumulated 3-6 times more progesterone than those from saline treated when stimulated with luteinizing hormone (LH). Testosterone accumulation by small and large follicles was not affected by one injection of GnRH but was depressed in follicles from rabbits treated with 5 injections of GnRH. A single injection of GnRH enhanced the ability of small and large follicles to release estradiol which was depressed 30% in the presence of LH. Multiple GnRH injections depressed estradiol accumulation by small and large follicles. These data suggest the administration of GnRH in vivo can have stimulatory as well as inhibitory effects on subsequent follicular steroid release and accumulation in vitro.
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Goodman AL. In vitro evidence of a role for inhibin in female rabbits. THE AMERICAN JOURNAL OF PHYSIOLOGY 1984; 246:E243-8. [PMID: 6422771 DOI: 10.1152/ajpendo.1984.246.3.e243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
To examine a regulatory role for inhibin in female rabbits, an in vitro bioassay for inhibin activity was modified to use cultured rabbit pituitary cells and charcoal-extracted porcine follicular fluid (pFFx) as a reference preparation. pFFx inhibited follicle-stimulating hormone (FSH) release in a dose-dependent manner in cultures from both intact (I) and castrate (C) does at doses that also inhibited FSH release by cultured rat pituitary cells. Basal FSH release by I cells was inhibited greater than 10% by 0.02% (vol/vol) and greater than 90% by greater than or equal to 0.2% pFFx, whereas in C cells maximal inhibition of FSH release plateaued at only approximately 75%. FSH secretion was restored after removal of pFFx in day 2 media. Luteinizing hormone (LH) release by C cells was not inhibited at any dose of pFFx, but in I cells LH was progressively inhibited to approximately 60% of control levels during day 2 (but not day 1). Charcoal-extracted media (0.25-1%) in which 5 X 10(5) rabbit granulosa cells had been earlier cultured for 72 h produced a parallel inhibition of FSH release. The present findings demonstrate that 1) rabbit pituitary cells are responsive to inhibin, i.e., pFFx preferentially inhibited FSH secretion in a direct, graded, and reversible manner and 2) rabbit follicular granulosa cells secrete an inhibin-like substance.
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Berger M, Jean-Faucher C, De Turckheim M, Veyssière G, Jean C. Sexual stimulation does not affect plasma LH nor testosterone levels in New-Zealand male rabbits. ARCHIVES INTERNATIONALES DE PHYSIOLOGIE ET DE BIOCHIMIE 1983; 91:59-62. [PMID: 6192785 DOI: 10.3109/13813458309106480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Young sexually naive (3-4 months) and sexually experienced (2-3 years) male rabbits were subjected to various sexual stimulation procedures. Blood samples were taken just before and 30 min after mounting (unreceptive females) or coitus (receptive females). Testosterone and luteinizing hormone were assayed using specific radioimmunoassays. Sexual stimulation did not affect postcoital testosterone and LH levels in naive and experienced males while in females LH levels were significantly increased. We may conclude that the postcoital neuroendocrine reflex which causes a massive release of pituitary LH in female rabbit does not exist in males.
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Younglai EV, Armstrong RW. Peripheral concentrations of gonadotropins and progestins during pregnancy in rabbits after active immunization against testosterone. Fertil Steril 1981; 36:232-7. [PMID: 6790308 DOI: 10.1016/s0015-0282(16)45686-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The effects of active immunization of female rabbits against testosterone on various endocrine parameters during pregnancy were examined. Peripheral blood samples were obtained from immunized rabbits at timed intervals after mating up to the 29th day of pregnancy, when the rabbits were killed and various tissues were analyzed. Progesterone concentrations were higher in testosterone-immunized rabbits (TIR) than in controls during pregnancy. Luteinizing hormone (LH) and follicle-stimulating hormone concentrations were not significantly different in controls and TIR during pregnancy. Both progestins and gonadotropins showed the expected coitus-induced increases, but LH levels were higher in TIR. The binding of testosterone in fetal plasma and amniotic fluid was higher in TIR than in controls. Weights of fetuses and litter size were not significantly different in TIR and controls. These data suggest that testosterone may play a role during pregnancy in the rabbit.
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Asch RH, Fernandez EO, Smith CG, Pauerstein CJ. Precoital Single Doses of Δ9-Tetrahydrocannabinol Block Ovulation in the Rabbit**Supported in part by National Institutes of Health Grant 1-P30-HD-10202, Radioimmunoassay Core, Bioassay Core, and in part by National Institute on Drug Abuse Grant RO-1-DA-01346-02. Fertil Steril 1979. [DOI: 10.1016/s0015-0282(16)43884-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hunzicker-Dunn M, Jungmann R, Derda D, Birnbaumer L. LH-induced desensitization of the adenylyl cyclase system in ovarian follicles. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1979; 112:27-44. [PMID: 223390 DOI: 10.1007/978-1-4684-3474-3_3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Studies on the gonadotrophin-responsive adenylyl cyclase (AC) system of rabbit and porcine ovarian follicles reveal that hCG or LH-induced desensitization of the AC system can be divided into two phases: an initial, LH-specific phase and a second phase which is not specific for LH. The first phase occurs within the first hour after LH-hCG-receptor interaction, is agonist specific, and is not mediated by protein synthetic events or by cAMP. In view of our previous demonstration of the critical dependence of the LH-induced desensitizing process in cell-free membrane preparations of porcine follicles upon Mg2+ and ATP, we investigated the role of a phosphorylation reaction in the first phase of the AC desensitizing process. Porcine follicular membranes rich in LH-sensitive AC activity were found to contain the molecular requirements necessary for a phosphorylation reaction: namely, cAMP-dependent and cAMP-independent protein kinases as well as phosphoprotein phosphatases. The following lines of indirect evidence indicated that reversal or resensitization of the desenzitized AC system to LH was mediated by a dephosphorylation reaction. Activators of endogenous phosphoprotein phosphatases--Mn2+ and dithiothreitol--promoted a specific resensitization of the follicular AC system to LH. Likewise, a partially purified phosphoprotein phosphatase also resensitized the desensitized, LH unresponsive AC to LH, and boiling of the phosphatase prevented its effect. LH-induced desensitization of the AC system, on the other hand, did not appear to be mediated by a cAMP-dependent protein kinase, as evidenced both by the inability of beef heart protein to promote desensitization of AC and by the inability of an inhibitor of cAMP-dependent protein kinase to prevent LH-induced densensitization. The second phase of desensitization, which occurs after the first hour following hCG-LH-receptor interaction, is characterized by a loss of responsiveness to FSH as well as to LH and can be promoted by dibutryl cAMP (in the absence of LH). These results provide new evidence on the characteristics and molecular mechanism of LH-induced densensitization of the follicular AC system. These results indicate that the level of phosphorylation of membrane-associated components may, in part, regulate the activity of the AC system during this first phase of homologous desensitization.
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Dailey RA, Tsou RC, Tindall GT, Neill JD. Direct hypophysial inhibition of luteinizing hormone release by dopamine in the rabbit. Life Sci 1978; 22:1491-8. [PMID: 353415 DOI: 10.1016/0024-3205(78)90004-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Neill JD, Dailey RA, Tsou RC, Tindall GT. Secretion of luteinizing hormone releasing hormone (LHRH) in monkeys. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1977; 87:203-24. [PMID: 409111 DOI: 10.1007/978-1-4615-8849-8_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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