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Marchetti C, Grisolia Romero M, Priotto M, Faya M, Gobello C. Effect of a GnRH Antagonist on Anti-Müllerian Hormone and Follicular Population in Anestrous Bitches. Animals (Basel) 2023; 13:2511. [PMID: 37570318 PMCID: PMC10416944 DOI: 10.3390/ani13152511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
The objective of this study was to describe the effect of the third-generation GnRH antagonist, acyline, on ovarian follicular population and serum anti-Müllerian hormone (AMH) concentrations in female dogs. Four late anestrous bitches were administered 330 μg/kg SC acyline every 10 days for 60 days and followed up for 45 days. Blood samples were drawn on days -1, 15, 30, 45, 60, 75, 90 and 105 for AMH determination. Then, the females were ovariectomized and the excised ovaries were gross and histologically evaluated. The total ovarian follicles were counted. None of the female dogs presented estrus during treatment. Only one bitch presented an ovulatory estrus 20 days after treatment. The total number of ovarian follicles in these bitches was 96,200.10 ± 26,125.12, with 84.13%, 11.36%, 7.8% and 0.01% corresponding to primordial, primary, secondary and antral structures, respectively. Pretreatment AMH concentrations were 0.62 ± 0.17 ng/mL. This hormone varied throughout the study period (p < 0.01), diminishing to nadir values during treatment to then rapidly recover after its effect (0.2 ± 0.05 vs. 0.67 ± 0.22 ng/mL; p < 0.01). Acyline rapidly and reversibly prevented the initiation of cycling without affecting follicle count but diminishing serum AMH concentrations.
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Affiliation(s)
- Cynthia Marchetti
- Center of Reproductive Physiology, Faculty of Veterinary Sciences, National University of La Plata, La Plata 1900, Argentina; (C.M.); (M.G.R.)
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires 2290, Argentina;
| | - Mariela Grisolia Romero
- Center of Reproductive Physiology, Faculty of Veterinary Sciences, National University of La Plata, La Plata 1900, Argentina; (C.M.); (M.G.R.)
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires 2290, Argentina;
| | - Marcelo Priotto
- Small Animal Clinics, Faculty of Agricultural Sciences, Catholic University of Córdoba, Córdoba 5000, Argentina;
| | - Marcela Faya
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires 2290, Argentina;
- Small Animal Clinics, Faculty of Agricultural Sciences, Catholic University of Córdoba, Córdoba 5000, Argentina;
| | - Cristina Gobello
- Center of Reproductive Physiology, Faculty of Veterinary Sciences, National University of La Plata, La Plata 1900, Argentina; (C.M.); (M.G.R.)
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires 2290, Argentina;
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Shahed A, Young KA. Assessing recrudescence of photoregressed Siberian hamster ovaries using in vitro whole ovary culture. Mol Reprod Dev 2018; 85:746-759. [PMID: 30091812 DOI: 10.1002/mrd.23050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 07/25/2018] [Accepted: 08/07/2018] [Indexed: 11/08/2022]
Abstract
In vitro culture has been used to study different aspects of ovarian function; however, this technique has not been applied to study recrudescence, or the return of ovarian function in seasonally breeding species. In Siberian hamsters, exposure to inhibitory photoperiods induces declines in ovarian function, which are restored with photostimulation. Because these changes are mediated by changes in systemic gonadotropin (GT) secretion, we hypothesized that culturing photoregressed ovaries with GT would restore aspects of function and induce expression of key folliculogenic factors. Adult female Siberian hamsters were exposed to either long-day (LD; 16L:8D) or short-day (SD; 8L:16D) photoperiods for 14 weeks to maintain in vivo cyclicity or induce gonadal regression, respectively. Isolated ovaries were then cultured for 10 days with or without GT. Ovarian mass and messenger RNA (mRNA) expression of mitotic marker Pcna were increased in cultured SD ovaries (cSD) ovaries with GT as compared to without GT, with no changes noted among cultured LD (cLD) ovaries. Media estradiol and progesterone concentrations increased in both cLD and cSD ovaries cultured with GT as compared to without GT. No differences in follicle numbers or incidence of apoptosis were noted across groups. In addition, differential mRNA expression of folliculogenic growth factors ( Bmp-4, Ntf-3, Inh-α, Gdf-9, Igf-1, Has-2, and Cox-2) was observed in cSD treated with or without GT. Together, these results suggest that this in vitro model could be a useful tool to (a) study the return of function in photoregressed ovaries, and (b) to identify the specific roles folliculogenic factors play in ovarian recrudescence.
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Affiliation(s)
- Asha Shahed
- Department of Biological Sciences, California State University Long Beach, Long Beach, California
| | - Kelly A Young
- Department of Biological Sciences, California State University Long Beach, Long Beach, California
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Place NJ, Crosier AE, Comizzoli P, Nagashima JB, Haefele H, Schmidt-Küntzel A, Marker LL. Age-associated and deslorelin-induced declines in serum anti-Müllerian hormone concentrations in female cheetahs, Acinonyx jubatus. Gen Comp Endocrinol 2017; 250:54-57. [PMID: 28602789 DOI: 10.1016/j.ygcen.2017.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/30/2017] [Accepted: 06/05/2017] [Indexed: 11/29/2022]
Abstract
Anti-Müllerian hormone (AMH) is widely used in human medicine to non-invasively estimate the size of the ovarian follicle reserve and to predict the ovarian response to gonadotropin stimulation in the context of assisted reproductive technologies (e.g., IVF). These applications of AMH testing have recently expanded to non-human mammals, with production animals, such as cows, goats and sheep being the primary focus of AMH research. However, few investigations have involved exotic species, and in particular carnivores. In this study, we measured AMH concentrations (0.078-3.078ng/mL) in archived serum samples that had been collected from 36 adult female cheetahs across their reproductive lifespan (2-15years of age). Similar to other mammals, AMH concentration in cheetahs declined with age, and its variability among females of the same age was considerable. The rates at which AMH declined over time in individual cheetahs were also highly variable. Five cheetahs had been contracepted with the long-acting GnRH agonist deslorelin for 6-18months prior to sample collection, and their AMH concentrations were relatively low compared to untreated females. In this first study of AMH in an exotic carnivore, the findings demonstrate that the age-associated decline in AMH is highly variable and that deslorelin appears to suppress AMH concentration in serum. Owing to the increased use of assisted reproductive technologies in ex situ populations of threatened and endangered species, such as cheetahs, the present study's findings will need to be taken into consideration if AMH is to be used successfully to optimize breeding management decisions in exotic species.
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Affiliation(s)
- Ned J Place
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - Adrienne E Crosier
- Smithsonian Conservation Biology Institute, Front Royal, VA and Washington, DC, USA
| | - Pierre Comizzoli
- Smithsonian Conservation Biology Institute, Front Royal, VA and Washington, DC, USA
| | - Jennifer B Nagashima
- Smithsonian Conservation Biology Institute, Front Royal, VA and Washington, DC, USA
| | | | | | - Laurie L Marker
- Cheetah Conservation Fund, P.O. Box 1755, Otjiwarongo, Namibia
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Nagashima JB, Hansen BS, Songsasen N, Travis AJ, Place NJ. Anti-Müllerian Hormone in the Domestic Dog during the Anestrus to Oestrous Transition. Reprod Domest Anim 2015; 51:158-64. [PMID: 26708613 DOI: 10.1111/rda.12660] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/25/2015] [Indexed: 11/26/2022]
Abstract
The reproductive cycle of the domestic dog features a long period of relative ovarian inactivity or anestrus. The mechanism of anestrous termination/oestrous resumption is not yet fully understood, which presents a challenge to the development of oestrous induction protocols. In this study, we assess the possibility that anti-Müllerian hormone (AMH) might play a role in this transition by characterizing its patterns of expression in the circulation during the transition from anestrus to oestrous and in all stages of ovarian follicular growth. Serum samples from five beagles (2.0-4.5 years) were collected three times per week at least 30 days prior to the onset of oestrous and assessed for AMH concentrations. Serum AMH concentration increased significantly during the transition from anestrus to proestrus and then declined back to the anestrous baseline beginning on day -4 before the luteinizing hormone surge, which was determined by changes in serum progesterone concentrations. Cortical sections of ovaries from females undergoing routine ovariohysterectomy (aged 8 months-5 years, n = 4) were evaluated for AMH by immunohistochemistry. Pre-antral and small antral follicles were most strongly immunoreactive for AMH. These data suggest that the increase in the number of antral follicles is associated with the rise in serum AMH as the anestrous period comes to an end. The rise in AMH might be useful in predicting the onset of oestrus and therefore assist with the optimization of oestrous induction protocols and possibly other assisted reproductive technologies.
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Affiliation(s)
- J B Nagashima
- Baker Institute for Animal Health, Cornell University, Ithaca, NY, USA
| | - B S Hansen
- Department of Population Medicine and Diagnostic Sciences, Cornell University, Ithaca, NY, USA
| | - N Songsasen
- Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | - A J Travis
- Baker Institute for Animal Health, Cornell University, Ithaca, NY, USA.,Atkinson Center for a Sustainable Future, Cornell University, Ithaca, NY, USA
| | - N J Place
- Department of Population Medicine and Diagnostic Sciences, Cornell University, Ithaca, NY, USA
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Park SU, Bernstein AN, Place NJ. Complementary histological and genomic analyses reveal marked differences in the developmental trajectories of ovaries in Siberian hamsters raised in long- and short-day lengths. Mol Reprod Dev 2014; 81:248-56. [DOI: 10.1002/mrd.22292] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 12/08/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Sung-Un Park
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine; Cornell University; Ithaca New York
| | - Adrien N. Bernstein
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine; Cornell University; Ithaca New York
| | - Ned J. Place
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine; Cornell University; Ithaca New York
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Shahed A, Young KA. Anti-Müllerian hormone (AMH), inhibin-α, growth differentiation factor 9 (GDF9), and bone morphogenic protein-15 (BMP15) mRNA and protein are influenced by photoperiod-induced ovarian regression and recrudescence in Siberian hamster ovaries. Mol Reprod Dev 2013; 80:895-907. [PMID: 23877969 PMCID: PMC3835454 DOI: 10.1002/mrd.22215] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 07/12/2013] [Indexed: 11/07/2022]
Abstract
Exposure of Siberian hamsters to short photoperiod (SD) inhibits ovarian function, including folliculogenesis, whereas function is restored with their transfer to long photoperiods (LD). To investigate the mechanism of photo-stimulated recrudescence, we assessed key folliculogenic factors-anti-Müllerian hormone (AMH), inhibin-α, growth differentiation factor-9 (GDF9), and bone morphogenic protein-15 (BMP15)-across the estrus cycle and in photo-regressed and recrudescing ovaries. Adult hamsters were exposed to either LD or SD for 14 weeks, which respectively represent functional and regressed ovaries. Select regressed hamsters were transferred back to LD for 2 (post-transfer week 2; PTw2) or 8 weeks (PTw8). Ovaries were collected and fixed in formalin for immunohistochemistry or frozen in liquid nitrogen for real-time PCR. AMH, inhibin-α, GDF9, and BMP15 mRNA and protein were detected in all stages of the estrus cycle. Fourteen weeks of SD exposure increased (P < 0.05) ovarian AMH, GDF9, and BMP15, but not inhibin-α mRNA levels as compared to LD. Transfer of regressed hamsters to stimulatory long photoperiod for 8 weeks returned AMH and GDF9 mRNA levels to LD-treated levels, and further increased mRNA levels for inhibin-α and BMP15. Immunostaining for AMH, inhibin-α, GDF9, and BMP15 proteins was most intense in preantral/antral follicles and oocytes. The overall immunostaining extent for AMH and inhibin-α generally mirrored the mRNA data, though no changes were observed for GDF9 or BMP15 immunostaining. Shifts in mRNA and protein levels across photoperiod conditions suggest possible syncretic roles for these folliculogenic factors in photo-stimulated recrudescence via potential regulation of follicle recruitment, preservation, and development.
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Affiliation(s)
- Asha Shahed
- Department of Biological Sciences, California State University Long Beach, Long Beach, California
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