Changes in brain seabream GnRH mRNA and pituitary seabream GnRH peptide levels during ovarian maturation in female barfin flounder

Amano, Masafumi; Pham, Ky Xuan; Amiya, Noriko; Yamanome, Takeshi; Yamamori, Kunio

doi:10.1016/j.ygcen.2008.06.008

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…Therefore, FSH and LH production may be activated at the pituitary, if the requirement of proximate and permissive factors is satisfied. Unlike previous findings that GnRH1 and GTHs increased with vitellogenesis (Amano, Pham, Amiya, Yamanome, & Yamamori, 2008;Gen et al, 2003), little difference was seen in the transcript levels of gnrh1 between the HF and LF groups. This may be partially due to the extent of ovarian development and indirectly explained by comparing the GSI (1.22 ± 0.44) of nonbreeding HF fish with that of fully matured, spawning fish (>8.00).…”

Section: Discussioncontrasting

confidence: 99%

Food availability alters expression profiles of genes in relation to reproduction and nutrition in the females of tropical damselfish (Chrysiptera cyanea)

et al. 2020

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This study evaluated the effects of food availability on the transcript levels of genes related to reproduction and growth in the sapphire devil (Chrysiptera cyanea), a tropical damselfish. Nonbreeding fish were reared at high-food (HF) and low-food (LF) levels for 4 weeks under long-days. Vitellogenic oocytes could be observed in the ovaries of the HF group. The quantitative polymerase chain reaction analysis revealed that lhβ and cyp19b in the brains, vtg and igf1 in the livers and cyp19a in the ovaries of HF fish were significantly higher than that of LF fish, suggesting that estradiol-17β (E2) synthesis in the ovary and brain is activated when suitable permissive factors are available to fish. Food limitation lowered hepatic igf1 and dio2, suggesting that the TH-IGF1 signaling system functions in the liver, and that food availability altered hepatic deiodination activities related to intercellular levels of thyroid hormones. Hepatic dio2 significantly decreased when fish were immersed for 3 days in E2-containing seawater; this suggests that E2 impedes the conversion of T4 to T3 in the liver. Our study shows that igf1 was upregulated in accordance with HF-induced vitellogenesis but downregulated by E2 treatment, suggesting that igf1 is bidirectional and altered by maturational status. Once vitellogenesis begins under a suitable range of proximal factors, fish need to maintain their nutritional status because food availability is a permissive factor for their reproduction.

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Section: Discussioncontrasting

confidence: 99%

Food availability alters expression profiles of genes in relation to reproduction and nutrition in the females of tropical damselfish (Chrysiptera cyanea)

et al. 2020

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“…An earlier study by Kim et al (2012) also reported increased levels of sbGnRH gene expression following injection with three GnRHs, and the authors suggested that sbGnRH may play an important role in the regulation of gonadal development and sex change in cinnamon clownfish. In gilthead seabream, Sparus aurata and barfin floundern Verasper moseri, the levels of sbGnRH in the pituitary of sexually mature fish were found to be higher than cGnRH-II and sGnRH levels in early recrudescent fish (Amano et al, 2008;Holland et al, 1998). Shahjahan et al (2010) also reported increased levels of sbGnRH gene expression in the spawning grass puffer, Takifugu niphobles, and suggested that sbGnRH may play a central role in final sexual maturation by stimulating GTH secretion in this species.…”

Section: Discussionmentioning

confidence: 98%

Effects of gonadotropin inhibitory hormone or gonadotropin-releasing hormone on reproduction-related genes in the protandrous cinnamon clownfish, Amphiprion melanopus

Choi

Kim

Habibi

et al. 2016

General and Comparative Endocrinology

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“…Like in the BPG axis of mammals, in fish GnRH is a major target of kisspeptin signaling (Parhar et al, 2004). Like in the rest of vertebrates, fish GnRHs are involved in gonadotropin secretion and gonad maturation (Amano et al, 2008). In the grass puffer, increased GnRH1 expression resulted from kiss2 and kiss2r increased expression (Shahjahan et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Sex-specific changes in the expression of kisspeptin, kisspeptin receptor, gonadotropins and gonadotropin receptors in the Senegalese sole (Solea senegalensis) during a full reproductive cycle

Mechaly

Viñas

Piferrer

2012

Comparative Biochemistry and Physiology Part A: Molecular &

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Kisspeptin is thought to have a major role in the control of the onset of puberty in vertebrates. However, our current understanding of its function in fish and how it integrates with other hormones is incomplete due to the high diversity of this group of animals and a still limited amount of available data. This study examined the temporal and spatial changes in expression of kisspeptin, gonadotropins and their respective receptors in the Senegalese sole during a full reproductive cycle. Kiss2 and kiss2r expression was determined by qRT-PCR in the forebrain and midbrain while expression of fshβ and lhβ was determined in the pituitary and fshr and lhr in the gonads. Plasma levels of testosterone (T), 11-ketotestosterone (11-KT) and estradiol-17β were measured by ELISA and gonadal maturation was assessed histologically. In males, kiss2 and kiss2r expression in the brain areas examined was highest towards the end of winter, just before the spawning season, which took place the following spring. This coincided with maximum levels of pituitary fshβ and lhβ, plasma T and 11-KT and the highest number of maturing fish. However, these associations were not evident in females, since the highest expression of kiss2, kiss2r and gonadotropins were observed in the fall, winter or spring, depending upon the variable and tissue considered. Taken together, these data show not only temporal and spatial, but also sex-specific differences in the expression of kisspeptin and its receptor. Thus, while expression of kiss2 in Senegalese sole males agrees with what one would expect according to its proposed role as a major regulator of the onset of reproduction, in females the situation was not so clear, since kiss2 and kiss2r expression was highest either before or during the spawning season.

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Changes in brain seabream GnRH mRNA and pituitary seabream GnRH peptide levels during ovarian maturation in female barfin flounder

Cited by 16 publications

References 19 publications

Food availability alters expression profiles of genes in relation to reproduction and nutrition in the females of tropical damselfish (Chrysiptera cyanea)

Food availability alters expression profiles of genes in relation to reproduction and nutrition in the females of tropical damselfish (Chrysiptera cyanea)

Effects of gonadotropin inhibitory hormone or gonadotropin-releasing hormone on reproduction-related genes in the protandrous cinnamon clownfish, Amphiprion melanopus

Sex-specific changes in the expression of kisspeptin, kisspeptin receptor, gonadotropins and gonadotropin receptors in the Senegalese sole (Solea senegalensis) during a full reproductive cycle

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