The inhibition of in-vitro ovulation from follicles of the teleost, Oryzias latipes, by cytochalasin B

Schroeder, Paul C.; Pendergrass, Paula B.

doi:10.1530/jrf.0.0480327

Cited by 19 publications

(3 citation statements)

References 16 publications

(22 reference statements)

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“…In mammals, the collagen type I gene is generally believed to be expressed in fibroblasts, which were electron microscopically proved to be present in the fibrous connective tissue (the tunica albuginea and theca externa) of the follicle (Espey 1999). In contrast, no fibroblasts are observed in the follicle cell layer of the medaka Schroeder and Pendergrass 1976;Iwamatsu and Ohta 1989). Due to the characteristic structure of the follicle cell layer, which consists of only two types of cells (granulosa and theca cells), the theca cells may have come to possess a dual role, functioning not only as endocrine cells producing steroid hormones but also as fibroblast-like cells producing the ECM proteins collagen type I and type IV.…”

Section: Discussionmentioning

confidence: 99%

Expression and localization of collagen type IV α1 chain in medaka ovary

et al. 2010

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A cDNA clone coding for collagen type IV α1 chain was obtained from the ovary of the medaka, Oryzias latipes. The clone encodes a protein of 1639 amino acids including a putative 21-residue signal peptide, and the deduced amino acid sequence of the α1 chain was homologous to those of the proteins from other species. Collagen type IV α1 chain mRNA was expressed in various tissues of the adult fish. In situ hybridization analysis revealed that the α1 chain mRNA was localized in the follicle layer of all growing follicles.In the post-ovulatory follicle that had released its oocyte in ovulation, the α1 chain transcript was detected in a winding line surrounding the tissue. This localization pattern was different from that of gelatinase B, a marker gene for granulosa cells. A specific antibody was prepared for the medaka collagen type IV α1 chain. Immunohistochemical analysis using this antibody yielded results consistent with those obtained by the in situ hybridization experiment. The current results indicate that in the medaka ovary, collagen type IV is synthesized by theca cells and is localized in the basement membrane.

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Section: Discussionmentioning

confidence: 99%

Expression and localization of collagen type IV α1 chain in medaka ovary

et al. 2010

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“…Indeed, at supraphysiological concentrations, cortisol can initiate ovulation of oocytes that have not yet experienced GVBD (Goetz & Theofan, ). Cortisol in the medium facilitated ovulation in medaka ( Oryzias latipes , Adrianichthyidae) follicles (Schroeder and Pendergrass, 1976). When Nile tilapia were injected with cortisol on the 10th day of their maturation cycle, ovulation occurred more rapidly (Gennotte et al., ).…”

Section: Cortisol and Oocyte Developmentmentioning

confidence: 99%

Maternal stress and fish reproduction: The role of cortisol revisited

Faught

Vijayan

2018

Fish and Fisheries

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Stressor‐induced elevation of circulating cortisol levels is generally considered to have an inhibitory effect on reproduction in teleosts. However, mature female fish have higher levels of circulating cortisol levels, and this is particularly telling in salmonids during their spawning migration. This raises the possibility that a cortisol buffering capacity is active at the level of the gonad. This is particularly important given the recent findings in zebrafish (Danio rerio, Cyprinidae) that zygotic cortisol content, either high or low, can alter developmental programming. Therefore, a tight regulation of corticosteroid during oogenesis may be essential for proper ovarian development. Here, we focus on the temporal dynamics of cortisol in the ovary and its role in regulating the different processes related to oogenesis. Maternally deposited cortisol along with the local production of this steroid by the ovary may be involved in the regulation of oogenesis. We propose two critical stages when cortisol may exert a modulatory effect on oogenesis. The first stage occurs during vitellogenesis when maternal cortisol is incorporated into the yolk, and the second is during maturation and ovulation when cortisol may have a regulatory role on the action of maturation‐inducing hormones. A key protective mechanism to prevent excess cortisol deposition appears to be the upregulation of 11β‐hydroxysteroid dehydrogenase 2 in the theca and/or granulosa cells of the developing oocyte in response to excess maternal cortisol stimulation. Taken together, cortisol dynamics during oogenesis is complex, but maintaining a “Goldilocks” concentration of this steroid may be a critical process governing successful spawning and progeny development.

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“…In vitro ovulation experiments can be performed using not only whole ovaries but also large preovulatory follicles dissected from the ovaries of the spawning fish (Schroeder and Pendergrass, 1976;Ogiwara et al, 2005). In vitro follicle ovulation experiments under various conditions have been used in our laboratory and are summarized in Fig.…”

Section: Medaka In Vitro Ovulation Modelmentioning

confidence: 99%