The saccus vasculosus of fish is a sensor of seasonal changes in day length
| Autor: | Masafumi Amano, Keisuke Ikegami, Ryosuke Maeda, Daisuke Takahashi, Naoyuki Yamamoto, Masayuki Iigo, Hiroko Ono, Hideki Abe, Noriko Amiya, Korenori Takeda, Takumi Senga, Natsumi Arai, Teruo Azuma, Takashi Yoshimura, Tomotaka Abe, Katsuya Kosuge, Takuya Suga, Ramu Hashimoto, Yusuke Nakane, Maiko Uesaka, Meita Kimijima |
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| Rok vydání: | 2013 |
| Předmět: |
Male
endocrine system medicine.medical_specialty Pituitary gland Rhodopsin Gonad Key genes media_common.quotation_subject Photoperiod General Physics and Astronomy Zoology Biology General Biochemistry Genetics and Molecular Biology Internal medicine Testis medicine Day length Animals Cells Cultured media_common photoperiodism Multidisciplinary Reproduction Fishes Animal Structures Brain General Chemistry Endocrinology medicine.anatomical_structure Gene Expression Regulation Multigene Family Fish Autoradiography Pars tuberalis Seasons Signal Transduction |
| Zdroj: | Nature communications. 4 |
| ISSN: | 2041-1723 |
| Popis: | The pars tuberalis of the pituitary gland is the regulatory hub for seasonal reproduction in birds and mammals. Although fish also exhibit robust seasonal responses, they do not possess an anatomically distinct pars tuberalis. Here we report that the saccus vasculosus of fish is a seasonal sensor. We observe expression of key genes regulating seasonal reproduction and rhodopsin family genes in the saccus vasculosus of masu salmon. Immunohistochemical studies demonstrate that all of these genes are expressed in the coronet cells of the saccus vasculosus, suggesting the existence of a photoperiodic signalling pathway from light input to neuroendocrine output. In addition, isolated saccus vasculosus has the capacity to respond to photoperiodic signals, and its removal abolishes photoperiodic response of the gonad. Although the physiological role of the saccus vasculosus has been a mystery for several centuries, our findings indicate that the saccus vasculosus acts as a sensor of seasonal changes in day length in fish. |
| Databáze: | OpenAIRE |
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