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• W2151673279 endingPage "629" @default.
• W2151673279 startingPage "623" @default.
• W2151673279 abstract "The gonadotropins (GtHs), follicle-stimulating hormone (FSH) and luteinizing hormone (LH), are heterodimers composed of a common α subunit (GPα) and a unique β subunit (FSHβ or LHβ); they are synthesized in and secreted from gonadotrophs (FSH and LH cells) in the pituitary. Little is known about the roles of FSH and LH during spermatogenesis in perciform fishes. In this study, we examined immunoreactive changes in FSH and LH cells, and changes in the gene expression of the three gonadotropin subunits in the pituitary of male chub mackerel Scomber japonicus during testicular development. FSHβ-immunoreactive (ir) and LHβ-ir cell area were measured immuno-histochemically based on the FSH and LH cell-occupying area in the proximal pars distalis. The FSHβ-ir cell area increased significantly during spermiation, while FSHβ mRNA levels, already high at the beginning of spermatogenesis, increased further, peaking during spermiation. In contrast, LHβ-ir cell area and LHβ mRNA levels, which were low at the beginning of spermatogenesis, increased significantly during late spermatogenesis, peaking during spermiation. For both FSH and LH, GtHβ-ir cell area and GtHβ mRNA levels decreased until gonadal resting. GPα mRNA levels showed similar changes to LHβ mRNA levels. These results suggest that in the chub mackerel, FSH may play an important role in the early and late phases of spermatogenesis, and that LH may play a role during late spermatogenesis and spermiation. Moreover, our results demonstrate that changes in GtHβ-ir cell area were accompanied by similar changes in the expression of the FSHβ and LHβ genes, both of which increased during testicular development." @default.
• W2151673279 created "2016-06-24" @default.
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• W2151673279 date "2012-09-01" @default.
• W2151673279 modified "2023-10-11" @default.
• W2151673279 title "Immunoreactivity of Gonadotrophs (FSH and LH Cells) and Gonadotropin Subunit Gene Expression in the Male Chub Mackerel<i>Scomber japonicus</i>Pituitary during the Reproductive Cycle" @default.
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• W2151673279 doi "https://doi.org/10.2108/zsj.29.623" @default.
• W2151673279 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22943787" @default.
• W2151673279 hasPublicationYear "2012" @default.
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