Tide-related Changes in mRNA Abundance of Aromatases and Estrogen Receptors in the Ovary and Brain of the Threespot Wrasse Halichoeres trimaculatus

Oh, Dae-Ju; Hur, Sung‐Pyo; Bouchekioua, Selma; Takeuchi, Yuki; Udagawa, Shingo; Aluru, Neelakanteswar; Park, Yong-Ju; Park, Ji‐Gweon; Kim, Se-Jae; Moon, Thomas W.; Vijayan, Mathilakath M.; Takemura, Akihiro

doi:10.1007/s12601-018-0016-0

Cited by 2 publications

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“…The present study also revealed that high transcript levels of cyp19b were observed in the brains of HF fish, suggesting that inferior nutrition has a negative impact on neurosteroid synthesis. As aromatization in the fish brain regulates reproductive and nonreproductive processes (Andersson, Borg, & Lambert, 1988; Diotel et al, 2010; Gelinas, Pitoc, & Callard, 1998; González & Piferrer, 2003; Oh et al, 2018), food limitation may influence key functions. In this regard, immunoreactivity against brain‐type aromatase (Cyp19a1b) was seen in LH cells and increased with vitellogenesis (Zhang et al, 2014).…”

Section: Discussionmentioning

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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