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Journal of Lipid Research, Vol. 43, 1472-1476, September 2002
Copyright © 2002 by Lipid Research, Inc.

Inheritance of cholesterol metabolism of probands with high or low cholesterol absorption

Helena Gylling^* and Tatu A. Miettinen^1,

^* Department of Clinical Nutrition, University of Kuopio, and Kuopio University Hospital, Kuopio, Finland
Division of Internal Medicine, Department of Medicine, University of Helsinki, Helsinki, Finland

¹ To whom correspondence should be addressed. e-mail: tatu.a.miettinen{at}helsinki.fi

Heredity of cholesterol absorption and synthesis was studied in siblings of hypercholesterolemic probands with low and high serum cholestanol to cholesterol ratio (assumed to indicate low and high absorption of cholesterol, respectively). Cholesterol synthesis was assayed with sterol balance technique and measuring serum cholesterol precursor to cholesterol ratios (synthesis markers of cholesterol), and cholesterol absorption with measuring dietary cholesterol absorption percentage and serum plant sterol and cholestanol to cholesterol ratios (absorption markers of cholesterol). In the siblings of the low absorption families, cholesterol absorption percentage and ratios of absorption markers were significantly lower, and cholesterol and bile acid synthesis, cholesterol turnover, fecal steroids and ratios of synthesis markers significantly higher than in the siblings of the high absorption families. The ratios of absorption and synthesis markers were inversely interrelated, and they were correlated with cholesterol absorption and synthesis in the siblings. In addition, low absorption was associated with high body mass index, low HDL cholesterol, and serum sex hormone binding globulin levels, suggesting that low absorption was associated with metabolic syndrome. Intrafamily correlations were significant for serum synthesis markers, cholestanol, triglycerides, and blood glucose level.

In conclusion, cholesterol absorption efficiency and synthesis are partly inherited phenomena, and they can be predicted by the ratios of non-cholesterol sterols to cholesterol in serum.

Supplementary key words cholesterol synthesis • non-cholesterol sterols • lathosterol • campesterol • sitosterol • cholestanol • coronary artery disease

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