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of National Natural Science Foundation of China","award":["GDNRC (2022) 50"],"award-info":[{"award-number":["GDNRC (2022) 50"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["2021KJCX012"],"award-info":[{"award-number":["2021KJCX012"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["2022KJCX019"],"award-info":[{"award-number":["2022KJCX019"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["2021sdr003"],"award-info":[{"award-number":["2021sdr003"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["2021B0202030002"],"award-info":[{"award-number":["2021B0202030002"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["2021XNYNYKJHZGJ022"],"award-info":[{"award-number":["2021XNYNYKJHZGJ022"]}]},{"name":"Youth Fund Project of National Natural Science Foundation of China","award":["31502144"],"award-info":[{"award-number":["31502144"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>A new insulin-like growth factor (Igf) subtype 3 (igf3) has recently been found in the bony fish orange-spotted grouper (Epinephelus coioides). However, the role of igf3 in the maturation of the ovary and sex differentiation in E. coioides is currently unknown. We examined the ovarian localization and receptor binding of the novel ortholog Igf3 using qRT-PCR, and Western blotting, combined with in situ hybridization and immunohistochemistry methods. Results demonstrated the presence of igf3 mRNA and protein in mature oocytes. Furthermore, Igf3 protein expression was not detected in testis, brain, kidney and liver homogenates. The calculated molecular weight of Igf3 was 22 kDa, which was consistent with the deduced amino acid sequence from the full-length open reading frame. The immunoreactivity showed that Igf3 was strongly present in the follicle staining fully-grown stage. The igf3 mRNA expression level was significantly positively correlated with ovarian follicular maturation. Meanwhile, Igf3 increased germinal-vesicle breakdown in a time- and dose-dependent manner. In vitro, treatment of primary ovarian cells with Igf3 up-regulated significantly the mRNA expression level of genes related to sex determination and reproduction such as forkhead boxl2 (foxl2), dosage-sensitive sex reversal adrenal hypoplasia critical region on chromosome x gene 1 (dax1), cytochrome P450 family 19 subfamily member 1 a (cyp19a1a), cytochrome P450 family 11 subfamily a member 1 a (cyp11a1a) and luteinizing hormone receptor 1 (lhr1). Overall, our results demonstrated that igf3 promotes the maturation of the ovary and plays an important role in sex differentiation in E. coioides.<\/jats:p>","DOI":"10.3390\/ijms24032868","type":"journal-article","created":{"date-parts":[[2023,2,2]],"date-time":"2023-02-02T03:47:33Z","timestamp":1675309653000},"page":"2868","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Expression Pattern of Insulin-Like Growth Factor Subtype 3 (igf3) in the Orange-Spotted Grouper Epinephelus coioides and Its Function on Ovary Maturation"],"prefix":"10.3390","volume":"24","author":[{"given":"Fang","family":"Jiao","sequence":"first","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"},{"name":"Zhongshan Innovation Center, South China Agricultural University, Zhongshan 528400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bing","family":"Fu","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"},{"name":"Zhongshan Innovation Center, South China Agricultural University, Zhongshan 528400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huayi","family":"Xue","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanyuan","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huihong","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huirong","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China"},{"name":"Zhongshan Innovation Center, South China Agricultural University, Zhongshan 528400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"336","DOI":"10.1016\/j.bbrc.2007.12.136","article-title":"Discovery of a gonad-specific IGF subtype in teleost","volume":"367","author":"Wang","year":"2008","journal-title":"Biochem. 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