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Cerebrotendinous xanthomatosis: pathophysiological study on bone metabolism
A Federico1, M T Dotti, F Loré
1Istituto di Scienze Neurologiche, Università di Siena, Italy.
Journal of the Neurological Sciences
|March 1, 1993
Summary
Cerebrotendinous xanthomatosis (CTX) patients with osteopenia show normal vitamin D levels but reduced bone density and impaired calcium absorption. This suggests CTX affects bone metabolism independently of vitamin D.
Area of Science:
- Endocrinology
- Metabolic Bone Disease
- Genetics
Background:
- Cerebrotendinous xanthomatosis (CTX) is a rare autosomal recessive disorder.
- Osteopenia has been anecdotally reported in some CTX patients.
- The underlying mechanisms of bone involvement in CTX remain unclear.
Purpose of the Study:
- To investigate bone metabolism in patients with cerebrotendinous xanthomatosis.
- To determine if osteopenia in CTX is related to vitamin D deficiency or intestinal calcium malabsorption.
Main Methods:
- Studied 8 patients from 5 families with confirmed CTX.
- Assessed serum calcium, phosphate, and vitamin D metabolites.
- Measured total body bone density and intestinal radiocalcium absorption.
Main Results:
- All patients exhibited normal serum levels of calcium, phosphate, and vitamin D metabolites.
- A majority of patients displayed reduced total body bone density.
- Impaired intestinal absorption of radiocalcium was observed in most patients.
Conclusions:
- Osteopenia in CTX patients is not associated with vitamin D deficiency.
- Bone metabolism is likely impaired in CTX due to factors other than vitamin D, possibly related to intestinal calcium absorption.
- Further research is needed to elucidate the specific mechanisms of bone disease in CTX.