Lecithin: cholesterol acyltransferase in Down's syndrome.

Area of Science:

• Biochemistry
• Human Physiology
• Genetics

Background:

• Down's syndrome is associated with a lower incidence of atherosclerosis.
• Understanding lipid transport system variations in Down's syndrome may reveal protective mechanisms.

Purpose of the Study:

• To compare plasma lipid transport parameters between individuals with Down's syndrome and mentally retarded individuals.
• To investigate potential differences in lecithin:cholesterol acyltransferase (LCAT) activity and its relation to lipid metabolism.

Main Methods:

• Comparison of plasma lipid parameters (cholesterol, triglyceride, HDL-cholesterol, apolipoproteins A-I, B, C-III, E) and LCAT activity.
• Measurement of body mass and blood pressure in institutionalized subjects.
• Statistical and partial correlational analyses to identify significant differences and relationships.

Main Results:

• Down's syndrome subjects exhibited a significantly lower fractional and molar rate of cholesterol esterification.
• No significant differences in overall plasma lipid levels or LCAT activity were found between groups.
• Correlational analyses suggested potential differences in lipoprotein composition and/or metabolism.

Conclusions:

• Down's syndrome subjects display altered cholesterol esterification rates, indicating distinct lipid metabolism.
• The observed differences in LCAT activity and lipid parameters warrant further investigation into their role in reduced atherosclerosis.
• The study provides insights into the atheroma-free model potential of Down's syndrome.