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The Dietary Lipid Content Affects the Tissue Gene Expression of Muscle Growth Biomarkers and the GH/IGF System of Pejerrey (Odontesthes bonariensis) Juveniles

Instituto Tecnológico de Chascomús (INTECH)-CONICET-UNSAM, Intendente Marino km 8.200, C.C. 164, Chascomús, Buenos Aires B7130IWA, Argentina
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Author to whom correspondence should be addressed.
Present address: BioMar A/S, Mylius Erichsensvej 35, 7330 Brande, Denmark.
Present address: CENEXA-UNLP-CONICET, Facultad de Ciencias Médicas, piso 4, Calle 60 y 120, La Plata, Buenos Aires B1900, Argentina.
Fishes 2019, 4(3), 37; https://doi.org/10.3390/fishes4030037
Received: 15 May 2019 / Revised: 7 June 2019 / Accepted: 10 June 2019 / Published: 27 June 2019
Gene expression of growth hormone receptors (GHRs), insulin-like growth factors (IGFs), myostatin (MSTN) and myogenin (MyoG) was analyzed in juveniles pejerrey fed with graded levels of lipids (L): 6% (L6), 10% (L10), 25% (L25). After 14 weeks, no changes were found in liver GHR-I GHR-II and IGF-II mRNA levels whereas IGF-I decreased in L10 and L25. Muscle GHR-I gene expression increased in L25 whereas GHR-II, IGF-II and MyoG were higher in L6. IGF-I and MSTN expression was not affected by the different diets. Adipose IGF-I mRNA levels decreased in L10. Correlations between body weight and members of GH/IGF system in liver and skeletal muscle were found only in L10 group. Correlations found in L10 group between both liver and skeletal muscle GHR-I and IGF-I were lost in either L6 or L25 groups. Thus, fish fed with apparently unbalanced dietary lipid contents (6% and 25%) exhibit a compensatory regulation of systemic and local components of the GH/IGF axis. Furthermore, the marked inhibition of muscle MyoG gene expression in L25 might limit excessive lipid deposition and fish growth. Our data suggest that a dietary lipid contents of 10% would promote a particular adjustment of the endocrine and autocrine/paracrine GH/IGF system, stimulating body growth and perhaps muscle hyperplasia. On the other hand, a higher dietary lipid content would uncouple the GH/IGF system, reducing hepatic IGF-I, while slightly increasing hepatic GHR-I, probably to prompt lipolysis. View Full-Text
Keywords: dietary lipids; growth biomarkers; somatotropic axis; neotropical teleost; animal nutrition dietary lipids; growth biomarkers; somatotropic axis; neotropical teleost; animal nutrition
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MDPI and ACS Style

Gómez-Requeni, P.; Kraemer, M.N.; Canosa, L.F. The Dietary Lipid Content Affects the Tissue Gene Expression of Muscle Growth Biomarkers and the GH/IGF System of Pejerrey (Odontesthes bonariensis) Juveniles. Fishes 2019, 4, 37. https://doi.org/10.3390/fishes4030037

AMA Style

Gómez-Requeni P, Kraemer MN, Canosa LF. The Dietary Lipid Content Affects the Tissue Gene Expression of Muscle Growth Biomarkers and the GH/IGF System of Pejerrey (Odontesthes bonariensis) Juveniles. Fishes. 2019; 4(3):37. https://doi.org/10.3390/fishes4030037

Chicago/Turabian Style

Gómez-Requeni, Pedro; Kraemer, Mauricio N.; Canosa, Luis F. 2019. "The Dietary Lipid Content Affects the Tissue Gene Expression of Muscle Growth Biomarkers and the GH/IGF System of Pejerrey (Odontesthes bonariensis) Juveniles" Fishes 4, no. 3: 37. https://doi.org/10.3390/fishes4030037

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