Linked Life Data

3925790

Source:http://linkedlifedata.com/resource/pubmed/id/3925790

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pubmed-article:3925790pubmed:abstractTextThe objectives of this study were to evaluate the rate at which brown adipose tissue (BAT) from mice atrophies when its thermogenic activity is suppressed during fasting or exposure to a thermoneutral environment (33 degrees C) and whether such atrophy is accompanied by loss from BAT mitochondria of "thermogenin," the GDP binding protein associated with the calorigenic proton conductance pathway. Atrophy of mouse BAT was characterized by rapid loss of protein but unchanged tissue DNA content. The rate of protein loss varied from 2 to 6 mg protein/day depending on the environmental and feeding status of the mice. In synchrony with tissue protein loss, there was a marked reduction in the tissue content of mitochondrial proteins and of thermogenin, measured by immunoassay. However, the concentration of thermogenin in isolated mitochondria was unchanged by fasting or exposure of the mice to 33 degrees C for 48 h. By contrast, marked reduction in [3H]GDP binding to isolated mitochondria were observed after exposure of the mice to 33 degrees C. Mice acclimated at 4 but not those acclimated at 21 degrees C showed reduction in GDP binding to isolated mitochondria during fasting. These results clearly indicate that changes in purine nucleotide binding to isolated mitochondria can occur in the absence of changes in the mitochondrial concentration of thermogenin. Thus rapid decrease in BAT thermogenic capacity (e.g., during fasting or 33 degrees C exposure) appears dependent on extensive loss of tissue protein, probably whole mitochondria, rather than rapid and selective removal of thermogenin from the mitochondria.lld:pubmed
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pubmed-article:3925790pubmed:articleTitleMitochondrial thermogenin content is unchanged during atrophy of BAT of fasting mice.lld:pubmed
pubmed-article:3925790pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:3925790pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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