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Regulation of lipoprotein lipase synthesis in 3T3-L1 adipocytes by cachectin. Further proof for identity with tumour necrosis factor.


ABSTRACT: We investigated the mechanism by which the endotoxin-induced macrophage secretory protein cachectin is able to suppress the activity of lipoprotein lipase in 3T3-L1 adipocytes. The loss in activity results from an effect on the synthesis of the enzyme, as determined by a decreased incorporation of [35S]methionine into immunoprecipitable lipoprotein lipase. The results were nearly identical whether crude conditioned medium or a highly purified preparation was utilized as a source of cachectin. [35S]Methionine incorporation into acid-precipitable protein was minimally affected by purified cachectin, suggesting that the suppression of the lipoprotein lipase was not due to a general suppression of protein synthesis. These results, taken together with our previous work, provide additional evidence that cachectin and tumour necrosis factor are functionally identical.

SUBMITTER: Price SR 

PROVIDER: S-EPMC1147456 | biostudies-other | 1986 Dec

REPOSITORIES: biostudies-other

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