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Journal of Lipid Research, Vol 37, 2193-2201, Copyright © 1996 by Lipid Research, Inc.
Urinary excretion of mevalonic acid as an indicator of cholesterol synthesis
B Lindenthal, A Simatupang, MT Dotti, A Federico, D Lutjohann and K von Bergmann
Department of Clinical Pharmacology, University of Bonn, Germany.
Urinary excretion of mevalonic acid was investigated as an indicator of
cholesterol synthesis. In normolipemic volunteers, excretion of mevalonic
acid averaged 3.51 +/- 0.59 (SD) micrograms/kg x day1; (n = 24) and was not
different from patients with hypercholesterolemia (3.30 +/- 0.92
micrograms/kg x day1; n = 24). In patients with cerebrotendineous
xanthomatosis, the excretion was significantly higher (8.55 +/- 1.92
micrograms/kg x day1; n = 6, P < 0.001) but comparable to volunteers
treated with cholestyramine (6.69 +/- 2.6 micrograms/kg x day1; n = 5). A
significant correlation was found between 24-h excretion of mevalonic acid
and cholesterol synthesis (r = 0.835; n = 35; P < 0.001). The
coefficient of variation of excretion of mevalonic acid during 3
consecutive days was small (9.8%; n = 7). However, urinary output of
mevalonic acid was significantly higher during the night (164 +/- 14
micrograms/12-h) than during the day (129 +/- 9 micrograms/12-h; n = 11; P
< 0.05). In patients treated with simvastatin (40 mg/day) for 6 weeks,
the ratio of mevalonic acid to creatinine in a morning urine sample
decreased significantly compared to pretreatment values (110 +/- 25
micrograms/g vs. 66 +/- 25 micrograms/g; P < 0.001). Furthermore, the
ratio of mevalonic acid to creatinine in a morning urine sample correlated
with the ratio from the 24-h collection period (r = 0.714; n = 34; P <
0.001). The results indicate that the analysis of urinary mevalonic acid,
either in 24-h collection or in a single morning sample, is an attractive
method for evaluation of long and very short term changes of the rates of
cholesterol synthesis.

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Copyright © 1996 by the American Society for Biochemistry and Molecular Biology.
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