Hypercholesterolemia in children with cystinosis

Area of Science:

• Pediatric Nephrology
• Metabolic Disorders
• Biochemistry

Background:

• Cystinosis is a rare genetic disorder causing lysosomal accumulation of cystine.
• Children with cystinosis often experience multisystem complications, including renal disease and metabolic disturbances.

Purpose of the Study:

• To investigate the prevalence and progression of hypercholesterolemia in children with cystinosis.
• To assess the impact of cystinosis on lipid profiles and nutritional status.
• To evaluate the effect of renal transplantation on cholesterol levels.

Main Methods:

• Longitudinal monitoring of diet, serum creatinine, and total cholesterol z scores (TCz) in 10 children with cystinosis for a mean of 5 years.
• Comparison of TCz scores between genders and with children suffering from other tubular disorders.
• Analysis of TCz score trends in relation to renal insufficiency and post-transplantation status.

Main Results:

• Elevated TCz scores were observed in cystinotic boys (P < 0.01) but not girls (P = 0.67).
• Boys exhibited progressive hypercholesterolemia from 1 year of age, with higher TCz scores compared to other tubular disorders.
• Renal insufficiency in cystinotic boys correlated with accelerated TCz score increases; transplantation led to lower but still elevated TCz scores.

Conclusions:

• Cystinotic boys experience significant, progressive hypercholesterolemia, distinct from other tubular disorders.
• Nutritional status deteriorates after age 3, characterized by decreased fat stores and high-fat, low-calorie diets.
• While renal transplantation improves hypercholesterolemia, it does not normalize cholesterol levels in cystinotic boys.