Our investigation on serum obtained from control rats and from rats treated with a steroid contraceptive drug (SCD) showed that serum from SCD treated rats had a lower activating capacity for lipoprotein lipase from rat epididymal adipose tissue. A similar result was observed when HDL apolipoproteins obtained from serum of these two groups of rats were tested against a lipoprotein lipase preparation. The data suggest a deficiency or an alteration of some serum cofactors (probably apolipoproteins of the C group). The observation that chylomicrons from SCD treated rats were slightly poorer substrate for lipoprotein lipase than those from control rats supports the hypothesis of a cofactor deficiency rather than a transfer of apolipoproteins from HDL to chylomicrons.
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