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Characterization of norepinephrine-stimulated protein synthesis in rat brown adipocytes

Characterization of norepinephrine-stimulated protein synthesis in rat brown adipocytes Waldbillig, D., and M. Desautels. Characterization of norepinephrine-stimulated . Am. J. Physiol. 263 (Regulatory Integrative Comp. Physiol. 32): R1003-R1012, 1992.-Rat were incubated for 24 h with or without norepinephrine (NE) in Dulbecco’s modified Eagle’s medium with albumin, calf serum, and antibiotics. fat cells were viable as defined by unchanged cell morphology, ATP content, or basal and NE-stimulated respiration. However, a 24-h exposure to NE led to a decline in NE-stimulated respiration that was not due to loss of thermogenic capacity. fat cells incubated with or without NE had similar , succinate dehydrogenase, and uncoupling (UCP) content. These results differ from those observed after food deprivation s where loss of mitochondrial s occurs within 24 h, suggesting that reduced exposure to NE is not the only factor responsible for fat atrophy. NE increased [ 35S] methionine incorporation into cellular s, mitochondrial s, and UCP. The effect of NE on cell was inhibited by propranolol but not by prazosin. It was also inhibited 95% by cycloheximide but only partially (50%) by actinomycin D in contrast to NE stimulation of UCP labeling, which required RNA transcription. Chloramphenicol-sensitive was stimulated by NE. These results indicate a trophic action of NE in exerted http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

Characterization of norepinephrine-stimulated protein synthesis in rat brown adipocytes

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Publisher
The American Physiological Society
Copyright
Copyright © 1992 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
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Abstract

Waldbillig, D., and M. Desautels. Characterization of norepinephrine-stimulated . Am. J. Physiol. 263 (Regulatory Integrative Comp. Physiol. 32): R1003-R1012, 1992.-Rat were incubated for 24 h with or without norepinephrine (NE) in Dulbecco’s modified Eagle’s medium with albumin, calf serum, and antibiotics. fat cells were viable as defined by unchanged cell morphology, ATP content, or basal and NE-stimulated respiration. However, a 24-h exposure to NE led to a decline in NE-stimulated respiration that was not due to loss of thermogenic capacity. fat cells incubated with or without NE had similar , succinate dehydrogenase, and uncoupling (UCP) content. These results differ from those observed after food deprivation s where loss of mitochondrial s occurs within 24 h, suggesting that reduced exposure to NE is not the only factor responsible for fat atrophy. NE increased [ 35S] methionine incorporation into cellular s, mitochondrial s, and UCP. The effect of NE on cell was inhibited by propranolol but not by prazosin. It was also inhibited 95% by cycloheximide but only partially (50%) by actinomycin D in contrast to NE stimulation of UCP labeling, which required RNA transcription. Chloramphenicol-sensitive was stimulated by NE. These results indicate a trophic action of NE in exerted

Journal

AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society

Published: Nov 1, 1992

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