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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.

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