出版社：American Society for Biochemistry and Molecular Biology
摘要：To compare endogenous cholesterol biosynthesis measured by deuterium incorporation (DI) and mass isotopomer distribution analysis (MIDA), cholesterol fractional and absolute synthetic rates were measured simultaneously by both techniques under identical physiological conditions. Twelve subjects (22 to 39 years of age) underwent a dual stable isotope protocol, involving oral deuterium oxide administration and measurement of incorporation of deuterium into cholesterol coincident with constant infusion of sodium [1-13C]acetate and measurement of the mass isotopomer distribution pattern of newly synthesized cholesterol. Synthesis was determined over 24 h with a 7-h feeding period. Both methods yielded similar measurements of fractional cholesterol synthesis (7.8 ± 2.5% day−1 for DI vs. 6.9 ± 2.2% day−1 for MIDA). Correlation of fractional synthesis across techniques was strong ( r = 0.84, P = 0.0007). Absolute synthesis rates were also not different at 24 h (13.4 ± 4.3 mg kg−1 day−1 for DI vs. 11.9 ± 3.6 mg kg−1 day−1 for MIDA, r = 0.79, P —Di Buono, M., P. J. H. Jones, L. Beaumier, and L. J. Wykes. Comparison of deuterium incorporation and mass isotopomer distribution analysis for measurement of human cholesterol biosynthesis. J. Lipid Res. 2000. 41: 1516–1523.
关键词：deuterium incorporation ; mass isotopomer distribution analysis ; cholesterol biosynthesis ; stable isotopes ; mass spectrometry
