Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds
Cold-exposed young birds maintain their homeothermy by stimulating mitochondrial oxidations in skeletal muscle. Prolonged cold exposure enhances muscle thermogenic capacities through mitochondrial bioenergetics plasticity which control still remains hypothetical. In mammals, fusion proteins (mitofus...
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fttriple:oai:gotriple.eu:10670/1.zln7hk 2023-05-15T14:03:04+02:00 Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds Implication potentielle des protéines de fusion mitochondriale dans l'ontogenèse des processus bioénergétiques musculaires chez l'oiseau Fongy, Anais Lyon 1 Duchamp, Claude Romestaing, Caroline 2013-11-26 http://www.theses.fr/2013LYO10276/document fr fre 10670/1.zln7hk http://www.theses.fr/2013LYO10276/document other Theses.fr Manchots Adélie Canetons Bioénergétique mitochondriale Fibres perméabilisées OPA1 Mfn2 Contraintes énergétiques Hormones thyroïdiennes Oiseaux Adélie penguins Ducklings Mitochondrial activity Permeabilized fibers Energetic constraints Thyroid hormones Birds envir geo Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2013 fttriple 2023-01-22T18:27:14Z Cold-exposed young birds maintain their homeothermy by stimulating mitochondrial oxidations in skeletal muscle. Prolonged cold exposure enhances muscle thermogenic capacities through mitochondrial bioenergetics plasticity which control still remains hypothetical. In mammals, fusion proteins (mitofusins (Mfns) and OPA1 (Optic Atrophy 1)) contribute to the permanent and dynamic changes in mitochondrial networks in multiple cell types. The aim of our work was to characterize the expression of avian homologues of mammalian fusion proteins and to study the variations of their expression during the establishment of bioenergetics processes in growing birds, during an acute or a prolonged cold exposure and finally during nutritional or endocrine challenges. Methodologically, an integrative approach has been used from whole animal (indirect calorimetry) to protein (western-blot) or gene (RT-PCR) expression through measurements of the bioenergetics functionality of permeabilized muscle fibers and isolated mitochondria. Two animal models were used, a species naturally adapted to Antarctica harsh conditions, the Adélie penguin (Pygoscelis adeliae), and a laboratory model, the Muscovy duck (Cairina moschata).Our results allowed us to characterize, in birds, the expression of immunoreactive fusion proteins (Mfn2, OPA1) which were homologous to those of mammals. The sequencing of a part of the coding sequence of Mfns genes showed a great similitude between avian and mammalian species. In penguins, the relative abundance of these proteins in muscle mitochondria was modified by growth in the cold and was positively correlated with muscle bioenergetics capacities. In ducks, the respiratory activity and the relative abundance of these proteins were also correlated after a 60h fasting period or,though a lesser extent, after a pharmacological alteration of thyroid status. Our results show, for the first time in birds, the expression of proteins homologous to mammalian fusion proteins. The association between the changes in ... Thesis Antarc* Antarctica Pygoscelis adeliae Unknown Manchots ENVELOPE(141.397,141.397,-66.811,-66.811) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
French |
topic |
Manchots Adélie Canetons Bioénergétique mitochondriale Fibres perméabilisées OPA1 Mfn2 Contraintes énergétiques Hormones thyroïdiennes Oiseaux Adélie penguins Ducklings Mitochondrial activity Permeabilized fibers Energetic constraints Thyroid hormones Birds envir geo |
spellingShingle |
Manchots Adélie Canetons Bioénergétique mitochondriale Fibres perméabilisées OPA1 Mfn2 Contraintes énergétiques Hormones thyroïdiennes Oiseaux Adélie penguins Ducklings Mitochondrial activity Permeabilized fibers Energetic constraints Thyroid hormones Birds envir geo Fongy, Anais Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
topic_facet |
Manchots Adélie Canetons Bioénergétique mitochondriale Fibres perméabilisées OPA1 Mfn2 Contraintes énergétiques Hormones thyroïdiennes Oiseaux Adélie penguins Ducklings Mitochondrial activity Permeabilized fibers Energetic constraints Thyroid hormones Birds envir geo |
description |
Cold-exposed young birds maintain their homeothermy by stimulating mitochondrial oxidations in skeletal muscle. Prolonged cold exposure enhances muscle thermogenic capacities through mitochondrial bioenergetics plasticity which control still remains hypothetical. In mammals, fusion proteins (mitofusins (Mfns) and OPA1 (Optic Atrophy 1)) contribute to the permanent and dynamic changes in mitochondrial networks in multiple cell types. The aim of our work was to characterize the expression of avian homologues of mammalian fusion proteins and to study the variations of their expression during the establishment of bioenergetics processes in growing birds, during an acute or a prolonged cold exposure and finally during nutritional or endocrine challenges. Methodologically, an integrative approach has been used from whole animal (indirect calorimetry) to protein (western-blot) or gene (RT-PCR) expression through measurements of the bioenergetics functionality of permeabilized muscle fibers and isolated mitochondria. Two animal models were used, a species naturally adapted to Antarctica harsh conditions, the Adélie penguin (Pygoscelis adeliae), and a laboratory model, the Muscovy duck (Cairina moschata).Our results allowed us to characterize, in birds, the expression of immunoreactive fusion proteins (Mfn2, OPA1) which were homologous to those of mammals. The sequencing of a part of the coding sequence of Mfns genes showed a great similitude between avian and mammalian species. In penguins, the relative abundance of these proteins in muscle mitochondria was modified by growth in the cold and was positively correlated with muscle bioenergetics capacities. In ducks, the respiratory activity and the relative abundance of these proteins were also correlated after a 60h fasting period or,though a lesser extent, after a pharmacological alteration of thyroid status. Our results show, for the first time in birds, the expression of proteins homologous to mammalian fusion proteins. The association between the changes in ... |
author2 |
Lyon 1 Duchamp, Claude Romestaing, Caroline |
format |
Thesis |
author |
Fongy, Anais |
author_facet |
Fongy, Anais |
author_sort |
Fongy, Anais |
title |
Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
title_short |
Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
title_full |
Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
title_fullStr |
Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
title_full_unstemmed |
Potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
title_sort |
potential implication of mitochondrial fusion proteins in the ontogeny of muscle bioenergetics in birds |
publishDate |
2013 |
url |
http://www.theses.fr/2013LYO10276/document |
long_lat |
ENVELOPE(141.397,141.397,-66.811,-66.811) |
geographic |
Manchots |
geographic_facet |
Manchots |
genre |
Antarc* Antarctica Pygoscelis adeliae |
genre_facet |
Antarc* Antarctica Pygoscelis adeliae |
op_source |
Theses.fr |
op_relation |
10670/1.zln7hk http://www.theses.fr/2013LYO10276/document |
op_rights |
other |
_version_ |
1766273548709527552 |