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. 1977 Aug;60(2):442–448. doi: 10.1172/JCI108794

Perifusion of Isolated Rat Adipose Cells

MODULATION OF LIPOLYSIS BY ADENOSINE

B Paul Turpin 1,2, William C Duckworth 1,2, Solomon S Solomon 1,2
PMCID: PMC372386  PMID: 874102

Abstract

Incubation of isolated rat epididymal fat cells is associated with the accumulation of adenosine in the incubation medium. To more clearly define the effect of adenosine on lipolysis, isolated rat epididymal adipocytes were studied with the perifusion system.

Various combinations of epinephrine, adenosine, and adenosine deaminase were perifused through the adipocytes. Exogenous adenosine, 0.001-10.0 μM, had no discernible influence upon unstimulated lipolysis; but exogenous adenosine inhibited epinephrine-sensitive lipolysis in a concentration-dependent manner. Cells perifused with 0.3 μM epinephrine plus 0.001 μM adenosine did not show any impairment of the lipolytic response to 0.3 μM epinephrine alone. Adenosine, 0.01 μM, inhibited the response to epinephrine by 50%; response to 0.3 μM epinephrine plus 0.1 μM adenosine was similar to the basal rate.

Perifusion with adenosine deaminase significantly increased basal lipolysis to 30% of the epinephrine response. Adenosine deaminase and epinephrine were synergistic in stimulating lipolysis to 180% of the response to epinephrine alone. Isolated fat cells were incubated for 30 min, and the cell-free used medium was perifused through fresh fat cells. Epinephrine in used medium was less effective in promoting lipolysis than epinephrine in fresh buffer. High-pressure liquid chromatography identified adenosine in the used medium. Bovine serum albumin possessed adenosine deaminase activity but accounted for negligible conversion of adenosine to inosine.

Adenosine is shown to have a modulating effect upon basal and hormone-stimulated lipolysis in the perifusion system. Sufficient endogenous adenosine (<0.01 μM) is present to maximally affect basal lipolysis. Hormone-stimulated lipolysis, although inhibited somewhat by endogenous adenosine, requires the addition of exogenous adenosine for complete inhibition.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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