Studies on norepinephrine-induced efflux of free fatty acid from hamster brown-adipose-tissue cells.

European Journal of Biochemistry
L L BieberO Lindberg

Abstract

Cells were isolated from brown adipose tissue of warm-adapted hamsters and the fate of free fatty acids released during norepinephrine-induced lipolysis was investigated. The isolated resting cells contain between 100-400 nmoles cell-associated free fatty acids per 10(6) cells; most preparations contained about 200 nmoles/10(6) cells. During norepinephrine-stimulated lipolysis, the level of cell-associated free fatty acids remains constant or decreases gradually, but does not increase, while the concentration of extracellular fatty acids increases linearly. The rate of norepinephrine-stimulated efflux of free fatty acids was 40 +/- 20 nmol X min-1 X 10(6) cells-1 (n = 11) at 37 degrees C. The data strongly indicate that brown adipose tissue can supply free fatty acids to the circulatory system in hamster.

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