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Vitamin C therapy ameliorates vascular endothelial dysfunction in treated patients with homocystinuria

Pullin, C. H., Bonham, James R., McDowell, Ian Frederick, Lee, P. J., Powers, H. J., Wilson, John Fawcett, Lewis, Malcolm John and Moat, Stuart James 2002. Vitamin C therapy ameliorates vascular endothelial dysfunction in treated patients with homocystinuria. Journal of Inherited Metabolic Disease 25 (2) , pp. 107-118. 10.1023/A:1015672625913

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Objectives: We sought to investigate the effects of short- and long-term vitaminC therapy on endothelial dysfunction in patients with homocystinuria. Background: Untreated homocystinuria due to cystathionine b-synthase deficiency is associated with premature atherothrombotic disease; 25% of untreated patients suffer a vascular event by the age of 16 years and 50% by 29 years. Treatment directed at reducing homocysteine accumulation significantly reduces this risk. However, despite ‘optimal’ treatment and compliance, hyperhomocysteinaemia usually persists and individuals exhibit endothelial dysfunction indicative of an adverse cardiovascular prognosis. Additional intervention is therefore required to further reduce cardiovascular risk. Methods: We investigated the endothelial effects of acute (2 g single dose) and chronic (1 g/day for 6 months) administration of oral vitamin C in 5 patients with homocystinuria (mean age 26 years, 1 male) and 5 age- and sex-matched controls. Brachial artery endothelium-dependent £ow-mediated dilatation (FMD) and endothelium-independent responses to nitroglycerin (NTG) were measured using high-resolution ultrasonic vessel wall-tracking. Results: Baseline: Plasma total homocysteine was 100:8±61:6 and 9:2±1:9 µmol/L in the patient and control groups, respectively (p < 0:001). FMD responses were impaired in the patient group (20±40 µm) compared with the controls (116±30 µm) (p < 0:001). Vitamin C administration: FMD responses in the patient group improved both acutely, 160±65 µm at 4h (p < 0:001), and chronically, 170±70 µm at 2 weeks (p < 0:001) and 170±40 µm at 6 months (p < 0:001). FMD responses in the control group were unaltered (p = 0:526). Within both groups, neither the vascular response to NTG nor plasma homocysteine was altered (p > 0:4). Conclusions: Vitamin C ameliorates endothelial dysfunction in patients with homocystinuria, independent of changes in homocysteine concentration and should therefore be considered as an additional adjunct to therapy to reduce the potential long-term risk of atherothrombotic disease.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
ISSN: 15732665
Last Modified: 18 Oct 2017 08:12

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