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JBC, Vol. 252, Issue 3, 950-954, Feb, 1977

Regulation of 3-hydroxy-3-methylglutaryl coenzyme a reductase in minimal deviation hepatoma 7288C. Immunological measurements in hepatoma tissue culture cells

O. R. Beirne, R. Heller and J. A. Watson

The mechanism of action of serum lipoproteins and 25-hydroxycholesterol on 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity in hepatoma tissue culture (HTC) cells was investigated using antiserum against purified rat liver HMG-CoA reductase (Heller, R. A., and Shrewsbury, M. A. (1976)J. Biol. Chem. 251, 3815-3822). This antiserum cross-reacted with solubilized and membrane-bound HMG-CoA reductase from HTC cells. The enzymes from rat liver and HTC cells appeared antigenically identical. The increase in HMG-CoA reductase activity of HTC cells grown in medium which lacked serum lipoproteins was shown to be due to an increase in immunoprecipitable enzyme. In contrast, the 25-hydroxycholesterol suppression of reductase activity leads to a reduction in the antigenicity of the enzyme rather than a decrease in its number of molecules.
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