2012
DOI: 10.1530/rep-12-0155
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Photoperiod-gonadotropin mismatches induced by treatment with acyline or FSH in Siberian hamsters: impacts on ovarian structure and function

Abstract: Many seasonal breeders time their reproductive efforts to specific times of the year to ensure adequate resources for the production and care of young. For long-day (LD) breeders, females born before the summer solstice (LDs) reach sexual maturity quickly and often breed that same year, whereas females born after the summer solstice (short days (SDs)) may delay reproductive development to the following spring when environmental conditions are favorable for reproduction. In Siberian hamsters, development in SD … Show more

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Cited by 6 publications
(12 citation statements)
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“…Consistent with previous in vivo studies, ovaries from adult Siberian hamsters housed for 14 weeks in SD were photoregressed, as demonstrated by reductions in ovarian mass as compared with ovaries from hamsters housed in stimulatory LD (Salverson et al, , Shahed & Young, ). In vivo transfer of photoregressed Siberian hamsters to LD stimulation increases plasma FSH and estradiol concentrations, ovarian mass, antral follicle development, and ovulation (Salomon et al, , Salverson et al, , Shahed, McMichael et al, , Zysling et al, ), with increases in both plasma FSH concentration and fshr mRNA noted after just 4 days after transfer from SD to LD photoperiods (Shahed, McMichael et al, ). While the intraovarian mechanism of in vivo photostimulated recrudescence has not been fully elucidated, less is known about the survival or growth of cultured photoregressed ovaries.…”
Section: Discussionmentioning
confidence: 99%
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“…Consistent with previous in vivo studies, ovaries from adult Siberian hamsters housed for 14 weeks in SD were photoregressed, as demonstrated by reductions in ovarian mass as compared with ovaries from hamsters housed in stimulatory LD (Salverson et al, , Shahed & Young, ). In vivo transfer of photoregressed Siberian hamsters to LD stimulation increases plasma FSH and estradiol concentrations, ovarian mass, antral follicle development, and ovulation (Salomon et al, , Salverson et al, , Shahed, McMichael et al, , Zysling et al, ), with increases in both plasma FSH concentration and fshr mRNA noted after just 4 days after transfer from SD to LD photoperiods (Shahed, McMichael et al, ). While the intraovarian mechanism of in vivo photostimulated recrudescence has not been fully elucidated, less is known about the survival or growth of cultured photoregressed ovaries.…”
Section: Discussionmentioning
confidence: 99%
“…Subsequent transfer of reproductively regressed Siberian hamsters to photoperiods longer than 12 hr of light restores the HPG axis, with increases in plasma FSH and estradiol, ovarian mass, tertiary follicle development and corpora luteal formation noted 1–8 weeks after transfer to stimulatory long photoperiod (Salomon et al, , Salverson et al, , Shahed, McMichael, & Young, ). These in vivo studies suggest that FSH is a key mediator in photostimulated resumption of ovarian function; indeed, in vivo FSH injections to photoregressed Siberian hamsters induce increases in ovarian mass (Zysling et al, ), further conveying the importance of GT stimulation to ovarian recrudescence.…”
Section: Introductionmentioning
confidence: 99%
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“…The SD‐induced effects on melatonin lead to decreased food intake and body mass (Knopper and Boily, ; Place et al, ) as well as lower serum concentrations of prolactin and gonadotropins (Dodge and Badura, ). In fact, the suppression of gonadotropins seemed like a good candidate to explain the SD ovarian phenotype; however, treatment of LD hamsters with the potent GnRH antagonist acyline did not recapitulate the SD ovarian histology (Zysling et al, ). Acyline‐treated LD females had much smaller ovaries than LD controls, but HGCs were not observed.…”
Section: Discussionmentioning
confidence: 99%
“…They counted luteinized atretic follicles, and found a modest number (17 ± 5.2) at 4 weeks and an abundant number (116 ± 16.6) of them by 8 weeks of age in SD females. Prior to the present study, our lab's earliest assessments of ovarian histology in LD and SD hamsters occurred at 10 weeks of age (Place et al, ; Timonin et al, ; Kabithe and Place, ; Place and Cruickshank, ; Zysling et al, ). Therefore, our first objective was to evaluate ovarian development in hamsters raised in LD or SD conditions to determine the age at which their ovarian histology diverges.…”
Section: Introductionmentioning
confidence: 99%