Simultaneous evaluation of HMG-CoA reductase and cholesterol 7alpha-hydroxylase activities by electrospray tandem mass spectrometry (ES-MS-MS) was performed. The assay was based on the measurement of mevalonolactone (MVL) and 7alpha-hydroxycholesterol (7alpha-OHC) produced by the incubation of HMG-CoA with hepatic microsomes in the presence of NADPH and glucose-6-phosphate dehydrogenase. Following extraction and purification using a cyanopropyl cartridge, MVL and 7alpha-OHC were analyzed, without derivatization, by ES-MS-MS. The analysis was achieved in 5 min. Calibration curves were made for MVL and 7alpha-OHC, and were linear from 0 to 100 microg. The recovery was >97%. The procedure was validated under similar calibration and recovery experiments, by measuring the above mentioned products as dimethylethylsilyl ether derivatives using the classical technique of GC-MS. Data obtained by ES-MS-MS and GC-MS showed a good correlation, with no significant differences. ES-MS-MS is a simple and reliable method for the evaluation of HMG-CoA reductase and cholesterol 7alpha-hydroxylase activities in liver microsomal preparations.
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