Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout
This study was aimed at clarifying the importance of a mechanistic target of rapamycin (mTOR) in the central orexigenic effect of valine in fish. For this, rainbow trout (Oncorhynchus mykiss) were intracerebroventricularly (ICV) injected with valine alone or in the presence of rapamycin as the mTOR...
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Aquaculture Nutrition |
| Online Access: | http://dx.doi.org/10.1155/2022/7509382 |
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| author | Sara Comesaña Mauro Chivite Ayelén M. Blanco María Alborja-Valado Jessica Calo Marta Conde-Sieira José L. Soengas |
| author_facet | Sara Comesaña Mauro Chivite Ayelén M. Blanco María Alborja-Valado Jessica Calo Marta Conde-Sieira José L. Soengas |
| author_sort | Sara Comesaña |
| collection | DOAJ |
| description | This study was aimed at clarifying the importance of a mechanistic target of rapamycin (mTOR) in the central orexigenic effect of valine in fish. For this, rainbow trout (Oncorhynchus mykiss) were intracerebroventricularly (ICV) injected with valine alone or in the presence of rapamycin as the mTOR inhibitor, and two experiments were performed. In the first experiment, we evaluated feed intake levels. In the second experiment, we evaluated in the hypothalamus and telencephalon the following: (1) the phosphorylation status of mTOR and its downstream effectors ribosomal protein S6 and p70 S6 kinase 1 (S6K1), (2) the abundance and phosphorylation status of transcription factors involved in appetite regulation, and (3) the mRNA levels of key neuropeptides associated with homeostatic regulation of feed intake in fish. Rising central levels of valine clearly resulted in an orexigenic response in rainbow trout. This response occurred in parallel with mTOR activation in both the hypothalamus and telencephalon, as supported by depressant changes in proteins involved in mTOR signalling (S6 and S6K1). Also, these changes disappeared in the presence of rapamycin. However, it is not clear which precise mechanisms link the activation of mTOR and the alteration in feed intake levels since we did not observe changes in mRNA levels of appetite-regulatory neuropeptides as well as in the phosphorylation status and levels of integrative proteins. |
| format | Article |
| id | doaj-art-24663aef40404afaa382e92bd70fffbf |
| institution | Kabale University |
| issn | 1365-2095 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Aquaculture Nutrition |
| spelling | doaj-art-24663aef40404afaa382e92bd70fffbf2025-02-03T01:00:41ZengWileyAquaculture Nutrition1365-20952022-01-01202210.1155/2022/7509382Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow TroutSara Comesaña0Mauro Chivite1Ayelén M. Blanco2María Alborja-Valado3Jessica Calo4Marta Conde-Sieira5José L. Soengas6Centro de Investigación MariñaCentro de Investigación MariñaCentro de Investigación MariñaCentro de Investigación MariñaCentro de Investigación MariñaCentro de Investigación MariñaCentro de Investigación MariñaThis study was aimed at clarifying the importance of a mechanistic target of rapamycin (mTOR) in the central orexigenic effect of valine in fish. For this, rainbow trout (Oncorhynchus mykiss) were intracerebroventricularly (ICV) injected with valine alone or in the presence of rapamycin as the mTOR inhibitor, and two experiments were performed. In the first experiment, we evaluated feed intake levels. In the second experiment, we evaluated in the hypothalamus and telencephalon the following: (1) the phosphorylation status of mTOR and its downstream effectors ribosomal protein S6 and p70 S6 kinase 1 (S6K1), (2) the abundance and phosphorylation status of transcription factors involved in appetite regulation, and (3) the mRNA levels of key neuropeptides associated with homeostatic regulation of feed intake in fish. Rising central levels of valine clearly resulted in an orexigenic response in rainbow trout. This response occurred in parallel with mTOR activation in both the hypothalamus and telencephalon, as supported by depressant changes in proteins involved in mTOR signalling (S6 and S6K1). Also, these changes disappeared in the presence of rapamycin. However, it is not clear which precise mechanisms link the activation of mTOR and the alteration in feed intake levels since we did not observe changes in mRNA levels of appetite-regulatory neuropeptides as well as in the phosphorylation status and levels of integrative proteins.http://dx.doi.org/10.1155/2022/7509382 |
| spellingShingle | Sara Comesaña Mauro Chivite Ayelén M. Blanco María Alborja-Valado Jessica Calo Marta Conde-Sieira José L. Soengas Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout Aquaculture Nutrition |
| title | Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout |
| title_full | Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout |
| title_fullStr | Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout |
| title_full_unstemmed | Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout |
| title_short | Involvement of Mechanistic Target of Rapamycin (mTOR) in Valine Orexigenic Effects in Rainbow Trout |
| title_sort | involvement of mechanistic target of rapamycin mtor in valine orexigenic effects in rainbow trout |
| url | http://dx.doi.org/10.1155/2022/7509382 |
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