Effect of photoperiod on the distribution patterns of androgen receptors and steroid hormone concentrations in ovaries of bank voles

Galas, Jerzy; Słomczyńska, Maria; Pierściński, A

doi:10.1078/0065-1281-00691

Cited by 11 publications

(11 citation statements)

References 38 publications

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“…1A-1D). Contrary to AR distribution in ovaries of mature females, 3 no AR presence in the oocytes from 21-day-old follicles was observed, apart from the oocyte from the periantral follicle in which a strong AR immunostaining was visible in two nucleoli (FIG. 1B).…”

Section: Ar Distributionmentioning

confidence: 83%

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Androgen Receptor in the Ovary of Postnatal Bank Vole Females

Galas

Słomczyńska

Kwaśnik

2005

Annals of the New York Academy of Sciences

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In this experiment, we investigated the influence of the photoperiod upon androgen receptor (AR) distribution and steroid concentrations in ovaries of 21-day-old bank vole females. Sections (6 mum) were assayed immunohistochemically. ARs were localized in the nuclei of granulosa cells. The strongest immunoreaction was observed in primary and early antral follicles, and declined during follicular development. P(4), A, and E(2) contents were measured by RIAs in ovarian homogenates from animals kept in two photoperiods. Ovaries of animals kept in a long photoperiod (18:6 light:dark), which stimulates gonadal activity, contained more P(4) than those kept in a short one (6:18 light:dark). There was no difference in levels of A and E(2).

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Section: Ar Distributionmentioning

confidence: 83%

“…3). Moreover, it has been shown that the latter secreted significant amounts of A and E 2 , with level differences dependent on the photoperiod 3. Apparently, the difference in follicular differentiation of LD and SD ovaries in 21‐day‐old females is not fully expressed as was the case in ovaries of mature females.…”

Section: Discussionmentioning

confidence: 99%

Androgen Receptor in the Ovary of Postnatal Bank Vole Females

Galas

Słomczyńska

Kwaśnik

2005

Annals of the New York Academy of Sciences

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“…Furthermore, this is not the first report of steroid receptors in the ooplasm of oocytes. Androgen receptors have been localized in the cytoplasm of oogonia and oocytes in rodents, suggesting that androgens could be involved in the regulation of oogenesis (Galas et al, ). ERβ was also detected in the ovaries of mice and pigs, despite the fact that ooplasm localization was only detected in mice (Zhao et al, ).…”

Section: Discussionmentioning

confidence: 99%

Apoptosis, proliferation and presence of estradiol receptors in the testes and Bidder's organ of the toad Rhinella arenarum (Amphibia, Anura)

Scaia

Czuchlej

Cervino

et al. 2015

Journal of Morphology

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The dynamic equilibrium between spermatogonial proliferation and testicular apoptosis determines the progression of spermatogenesis in amphibians. Estrogens and their receptors play a central role in regulating spermatogenesis in vertebrates, and in some species of anurans, estradiol (E2 ) is involved in the regulation of spermatogonial proliferation and apoptosis of germ cells. Bidder's organ (BO) is a structure characteristic of Bufonidae that has historically been compared to an undeveloped ovary. In adult Rhinella arenarum males, BO is one of the main sources of plasma E2 . The aim of this study was 1) to describe the seasonal variations in testicular apoptosis, spermatogonial proliferation, and cellular proliferation in BO; and 2) to analyze the presence and localization of estrogen receptor β (ERβ) in the testes and BO of R. arenarum. Testicular fragments and BOs from animals collected during the year were labeled with 5-bromo-2'-deoxyuridine (BrdU) and BrdU incorporation was determined using immunohistochemistry. Apoptosis in testicular sections was detected using the TUNEL method, and ERβ localization was assessed using immunohistochemistry in testes and BOs. The results indicate that spermatogonial proliferation is highest during the reproductive season and that cysts of spermatocytes and spermatids undergo apoptosis during the postreproductive season. Furthermore, the proliferation of follicular cells is highest during the reproductive and postreproductive seasons. ERβ was primarily detected by immunolocalization in Sertoli cells, follicular cells, and oocytes. Taken together, these results suggest that cysts that do not form spermatozoa are removed from testes by apoptosis and that estrogens regulate both spermatogenesis and oogenesis in adult males of R. arenarum.

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“…Circadian photo-period is vital to many animals, since a number of physiological activities are related to photo-period signals [1,2,3]. For example, in mammals, disrupting circadian photo-period could alter the secretion of numerous hormones [4,5,6,7,8,9,10], and recent studies on dairy heifers and sheep showed that prolactin concentrations were changed by photo-period manipulation [4, 5]. The circadian photo-period is also involved in regulating the secretion of many important reproductive hormones including luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol, and progesterone in non-pregnant mammals [6,7,8,9,10].…”

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confidence: 99%

“…For example, in mammals, disrupting circadian photo-period could alter the secretion of numerous hormones [4,5,6,7,8,9,10], and recent studies on dairy heifers and sheep showed that prolactin concentrations were changed by photo-period manipulation [4, 5]. The circadian photo-period is also involved in regulating the secretion of many important reproductive hormones including luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol, and progesterone in non-pregnant mammals [6,7,8,9,10]. In addition, recent studies have shown that expression of the clock and clock-controlled ovarian stromal genes synchronized by the environmental photo-period play a role in ovarian hormone synthesis, suggesting that the circadian photo-period manipulates hormone secretion, potentially via the molecular clockwork mechanism [11, 12].…”

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confidence: 99%

Disrupting the circadian photo-period alters the release of follicle-stimulating hormone, luteinizing hormone, progesterone, and estradiol in maternal and fetal sheep

Gao

et al. 2016

Journal of Reproduction and Development

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Although a large number of studies show that photo-period disruption potentially affects hormone secretion in mammals, information about the effects of circadian photo-period disruption during pregnancy on fetal blood reproductive hormone levels is scarce. This study used ewes and their fetuses to determine the effects of circadian photo-period disruption (deprivation of darkness) on follicle-stimulating hormone, luteinizing hormone, estradiol, and progesterone in maternal and fetal circulation at late gestation. Pregnant ewes (gestational age: 135 ± 3 days) were randomly placed into control and dark deprivation groups. The control (N = 5) and dark deprivation (N = 5) groups were exposed to a fixed 12 h light/12 h dark cycle and a 24 h constant light cycle, respectively, for 2 days. Dark deprivation up-regulated follicle-stimulating hormone and estradiol levels and down-regulated progesterone levels in both maternal and fetal circulation, and up-regulated luteinizing hormone levels in fetal but not maternal circulation. These results provide new information about how circadian photo-period disruption during pregnancy could alter the release of certain reproductive hormones into fetal blood, which may influence the development of fetal organs in utero, as well as long-term health.

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Effect of photoperiod on the distribution patterns of androgen receptors and steroid hormone concentrations in ovaries of bank voles

Cited by 11 publications

References 38 publications

Androgen Receptor in the Ovary of Postnatal Bank Vole Females

Androgen Receptor in the Ovary of Postnatal Bank Vole Females

Apoptosis, proliferation and presence of estradiol receptors in the testes and Bidder's organ of the toad Rhinella arenarum (Amphibia, Anura)

Disrupting the circadian photo-period alters the release of follicle-stimulating hormone, luteinizing hormone, progesterone, and estradiol in maternal and fetal sheep

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