Smith-Lemli-Opitz Syndrome and Cholic Acid

Overview

The purpose of this study is to determine whether dietary cholic acid therapy benefits people with Smith-Lemli-Opitz syndrome (SLOS) by leading to an increase in plasma cholesterol and reduction in harmful cholesterol precursors. SLOS participants will be treated with dietary cholic acid for 8 weeks and plasma cholesterol and cholesterol precursor metabolites will be measured.

People with SLOS have a deficiency of the 7-dehydrocholesterol reductase enzyme that makes cholesterol. Consequently, they exhibit deficient cholesterol levels and increased cholesterol precursor lipids, which are thought to be toxic. Cholesterol itself normally regulates the cholesterol synthesis pathway in the body and under conditions of low cholesterol seen in SLOS, more of the toxic cholesterol precursors are made. Since cholesterol is also necessary for production of bile acids in the liver, which help digest dietary cholesterol from the intestine, it is likely that low cholesterol levels in SLOS impairs bile acids from being made, which in turn prevents dietary cholesterol from being absorbed properly and contributes to the cholesterol deficiency seen in SLOS. Raising cholesterol in SLOS people by improving its absorption from the diet is expected to decrease the potentially toxic cholesterol precursor lipids, and both changes would be theoretically beneficial for SLOS people. The objective of this study is to determine whether treatment with cholic acid (a major bile acid made in the body that improves fat absorption) will increase dietary absorption of cholesterol, reverse plasma cholesterol deficiency, and reduce harmful cholesterol precursor lipids. These changes would be favorable for SLOS people. To accomplish this objective, SLOS participants will be given dietary cholic acid (brand name Cholbam, manufactured by Retrophin) for 8 weeks and plasma cholesterol and its precursor lipids will be measured before and while taking the drug. SLOS participants who are between 2 years and 25 years of age and are taking supplemental dietary cholesterol for at least 3 months will be enrolled. Participants must be clinically stable and able to travel to a study site. No change in supplemental dietary cholesterol intake will be allowed during the study, and dietary records will be obtained throughout the study. To qualify for cholic acid therapy, participants must have plasma cholesterol ≤125 mg/dl before starting cholic acid. Participants will be treated with cholic acid for 8 weeks and will have blood specimens drawn at baseline (day 0), 4-weeks, 8-weeks and 12 weeks (4 weeks after stopping cholic acid therapy).

Conditions

Interventions

Eligibility

Locations (2)

Outcomes