1
|
Simó I, Faggiani M, Fernandez DA, Sciara AA, Arranz SE. The cellular basis of compensatory muscle growth in the teleost Odontesthes bonariensis. J Exp Biol 2021; 225:273693. [PMID: 34889453 DOI: 10.1242/jeb.242567] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 12/06/2021] [Indexed: 11/20/2022]
Abstract
This study evaluates white muscle growth and in vivo cell proliferation during a fasting and refeeding trial, using pejerrey Odontesthes bonariensis as animal model, in order to better understand the cellular basis governing catch-up growth. Experiments consisted in two groups of fish, a control one continuously fed ad libitum, and a group fasted for 2 weeks and then fed for another 2 weeks. We examined how the formation of new muscle fibers and their increase in size were related to muscle precursor cell (MPC) proliferation under both experimental conditions. During fasting, the number of 5-ethynyl-2'-deoxyuridinepositive (EdU+) cells decreased along with myogenic regulatory factors (MRF) mRNA levels related to myoblast proliferation and differentiation, and the muscle stem cell-markerPax7 mRNA level increased. Analysis of myomere cross-sectional area, distribution of muscle fiber sizes and number of fibers per myomere showed that muscle hypertrophy but not hyperplasia was inhibited during fasting. Both higher igf2 mRNA level and the persistence of cell proliferation could be supporting new myofibre formation. On the other hand, an exacerbated MPC proliferation occurred during catch-up growth, and this increase in cell number could be contributing to the growth of both pre-existing and newly form small fibers. The finding that some MPCs proliferate during fasting and that muscle growth mechanisms, hyperplasia and hypertrophy, are differentially regulated could help to explain why re-fed fish could growth at higher rates, and why they return to the lost growth trajectory.
Collapse
Affiliation(s)
- Ignacio Simó
- Laboratorio Mixto de Biotecnología Acuática, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Centro Científico, Tecnológico y Educativo Acuario del Río Paraná, Av. Eduardo Carrasco y Cordiviola s/n, Rosario, 2000, Argentina
| | - Mariano Faggiani
- Laboratorio Mixto de Biotecnología Acuática, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Centro Científico, Tecnológico y Educativo Acuario del Río Paraná, Av. Eduardo Carrasco y Cordiviola s/n, Rosario, 2000, Argentina
| | - Daniel A Fernandez
- Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA), Universidad Nacional de Tierra del Fuego (UNTDF), Fuegiabasket 251, V9410BXE Ushuaia, Argentina.,Centro Austral de Investigaciones Científicas (CADIC-CONICET), Bernardo A. Houssay 200, V9410BXE Ushuaia, Argentina
| | - Andrés A Sciara
- Laboratorio Mixto de Biotecnología Acuática, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Centro Científico, Tecnológico y Educativo Acuario del Río Paraná, Av. Eduardo Carrasco y Cordiviola s/n, Rosario, 2000, Argentina
| | - Silvia E Arranz
- Laboratorio Mixto de Biotecnología Acuática, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Centro Científico, Tecnológico y Educativo Acuario del Río Paraná, Av. Eduardo Carrasco y Cordiviola s/n, Rosario, 2000, Argentina
| |
Collapse
|