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Hyperlipidaemia does not impair vascular endothelial function in glycogen storage disease type 1a
P J Lee1, D S Celermajer, J Robinson
1Medical Unit, Institute of Child Health, London, UK.
Atherosclerosis
|September 30, 1994
Summary
Patients with glycogen storage disease type 1 (GSD-1) have high lipids but show normal endothelial function, suggesting a surprising resilience to atherosclerosis. Further research is needed to understand this protective mechanism in GSD-1 and other hyperlipidemias.
Area of Science:
- Cardiovascular Research
- Metabolic Disorders
- Vascular Biology
Background:
- Glycogen storage disease type 1 (GSD-1) is associated with severe hyperlipidemia, a known risk factor for atherosclerosis.
- Endothelial dysfunction is an early indicator of atherosclerosis and is often observed in at-risk individuals.
- Dietary therapy for GSD-1 improves but does not fully correct hyperlipidemia, leaving patients potentially vulnerable to cardiovascular complications.
Purpose of the Study:
- To investigate endothelial function in adult patients with GSD-1a.
- To assess the relationship between hyperlipidemia in GSD-1a and early signs of atherosclerosis.
- To explore potential protective mechanisms against arterial damage in GSD-1 patients.
Main Methods:
- Utilized non-invasive ultrasonography to measure brachial artery endothelial function.
- Studied 6 adult GSD-1a patients (23-33 years) with marked hyperlipidemia (cholesterol 7.9 mmol/l, triglycerides 9.1 mmol/l).
- Compared endothelial function in GSD-1a patients against 12 age- and sex-matched normolipidemic controls.
Main Results:
- Flow-mediated, endothelium-dependent dilation was comparable between GSD-1a patients (8.2%) and controls (10.5%; P = 0.20).
- Despite significant hyperlipidemia, GSD-1a patients did not exhibit impaired endothelial function.
- The findings suggest a potential lack of clinically evident atherosclerosis in GSD-1, contrary to expectations.
Conclusions:
- Adult GSD-1a patients with hyperlipidemia demonstrate normal endothelial function.
- These findings challenge the presumed high risk of atherosclerosis in GSD-1.
- The study highlights an unknown mechanism protecting GSD-1 patients from the arterial effects of hyperlipidemia, with potential implications for managing secondary hyperlipidemias.