4 Regulation of Oocyte Growth and Maturation in Fish

Nagahama, Yoshitaka; Yoshikuni, Michiyasu; Yamashita, Masakane; Tokumoto, Toshinobu; Katsu, Yoshinao

doi:10.1016/s0070-2153(08)60565-7

Cited by 306 publications

(169 citation statements)

References 107 publications

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“…T ! progestagen is common to most teleosts and is the result of a GtH-mediated shift in steroidogenesis, in which there is a progressive decrease in aromatase activity and concomitant activation of 20b-hydroxysteroid dehydrogenase (20b-HSD) to produce the maturation-inducing steroid (MIS, Kobayashi et al, 1987;Nagahama et al, 1995;Scott et al, 1983). In Lusitanian toadfish 17,20b,21-P, has been identified as the probable MIS by in vitro studies (Modesto and Canario, 2002) and that is supported in the current study by the elevated 17,20b,21-P during spawning and the simultaneous absence of 17,20b-P.…”

Section: Discussionmentioning

confidence: 99%

Morphometric changes and sex steroid levels during the annual reproductive cycle of the Lusitanian toadfish, Halobatrachus didactylus

Modesto

Canário

2003

General and Comparative Endocrinology

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Section: Discussionmentioning

confidence: 99%

Morphometric changes and sex steroid levels during the annual reproductive cycle of the Lusitanian toadfish, Halobatrachus didactylus

Modesto

Canário

2003

General and Comparative Endocrinology

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“…We chose to measure steroids secreted mainly during the secondary growth phase (testosterone and 17b-estradiol; E 2 ) and during final maturation of the oocytes (17,20b-P). Testosterone is produced by the theca cells surrounding the follicle under gonadotrophic stimulation and has positive feedback effects in the pituitary (Nagahama et al, 1995). Testosterone is the precursor of E 2 produced in the granulosa cells, which promotes ovarian growth through the stimulation of synthesis and secretion of vitellogenin and egg shell proteins in the liver (Lubzens et al, 2010;Nagahama et al, 1995;Senthilkumaran et al, 2004;Young et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Testosterone is produced by the theca cells surrounding the follicle under gonadotrophic stimulation and has positive feedback effects in the pituitary (Nagahama et al, 1995). Testosterone is the precursor of E 2 produced in the granulosa cells, which promotes ovarian growth through the stimulation of synthesis and secretion of vitellogenin and egg shell proteins in the liver (Lubzens et al, 2010;Nagahama et al, 1995;Senthilkumaran et al, 2004;Young et al, 2005). After oocyte growth, a shift in steroidogenesis leads to the production of 17,20b-dihydroxypregn-4-en-3-one (17,20b-P) also in the granulosa cells which induces the resumption of meiosis and final oocyte maturation (Nagahama, 1997;Senthilkumaran et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Tilapia male urinary pheromone stimulates female reproductive axis

Huertas

Almeida

Canário

et al. 2014

General and Comparative Endocrinology

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a b s t r a c tMozambique tilapia males congregate in leks where they establish dominance hierarchies and attract females to spawn in sandy pits. Dominant males store more urine than subordinates and the pattern of urination and the high sensitivity of females to male urine suggest chemical signalling via the urine. Here we show that pre-ovulated and post-spawn females when exposed to dominant male urine increased significantly, in less than 1 h, the release rate of the maturation-inducing steroid 17,20b-dihydroxypregn-4-en-3-one which is maintained elevated for at least 6 h. This indicates a pheromonal role for male urine in the synchronisation of spawning. Furthermore, we show that the lack of affinity of 17,20bP to sex steroid binding globulin explains, at least partly, its rapid release and lack of detection in the blood. Thus tilapia urine involvement in several communication processes confirms that cichlids have evolved a sophisticated chemical signalling system together with their complex visual, acoustic and behavioural displays.

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“…In addition, there has been significant progress in the past decade toward elucidation of the regulatory mechanisms of gametogenesis and maturation using fish as experimental models [20,21,22]. The structure of the SC in several fishes has been reported [23,24,25,26], but its molecular components have not yet been identified in any fish.…”

mentioning

confidence: 99%

Structural components of the synaptonemal complex, SYCP1 and SYCP3, in the medaka fish Oryzias latipes

Iwai

Yoshii

Yokota

et al. 2006

Experimental Cell Research

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1 SummaryThe synaptonemal complex (SC) is a meiosis-specific structure essential for synapsis of homologous chromosomes. For the first time in any non-mammalian vertebrates, we have isolated cDNA clones encoding two structural components of the SC, SYCP1 and SYCP3, in the medaka, and investigated their protein expression during gametogenesis.As in the case of mammals, medaka SYCP1 and SYCP3 are expressed solely in meiotically dividing cells. In the diplotene stage, SYCP1 is diminished at desynaptic regions of chromosomes and completely lost on the chromosomes at later stages.SYCP3 is localized along the arm and centromeric regions of chromosomes at metaphase I, and its existence on the whole chromosomes persists up to anaphase I, a situation different from that reported in the mouse, in which SYCP3 is confined to the centromeric regions but lost on the arm regions at metaphase I. Thus, the expression patterns of SC components are different in mammals and fish despite the resemblance in morphological structure of the SC, suggesting divergence in the function of the SC in regulation of meiosis-specific chromosomal behavior. Since the antibody against medaka SYCP3 is cross-reactive to other fishes, it should be generally useful for a meiosis-specific marker in fish germ cells.

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4 Regulation of Oocyte Growth and Maturation in Fish

Cited by 306 publications

References 107 publications

Morphometric changes and sex steroid levels during the annual reproductive cycle of the Lusitanian toadfish, Halobatrachus didactylus

Morphometric changes and sex steroid levels during the annual reproductive cycle of the Lusitanian toadfish, Halobatrachus didactylus

Tilapia male urinary pheromone stimulates female reproductive axis

Structural components of the synaptonemal complex, SYCP1 and SYCP3, in the medaka fish Oryzias latipes

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