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LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
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Does folic acid decrease plasma homocysteine and improve endothelial function in patients with predialysis renal

J Thambyrajah1, M J Landray, F J McGlynn

  • 1Division of Medical Sciences (Cardiology), University of Birmingham Birmingham, UK. J.Thambyrajah@bham.ac.uk

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Summary
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High-dose folic acid lowered hyperhomocysteinemia in chronic renal failure patients but did not improve endothelial function. This suggests folic acid may not reduce vascular disease burden in uremia.

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Area of Science:

  • Nephrology
  • Cardiovascular Medicine
  • Nutritional Science

Background:

  • Hyperhomocysteinemia is an independent vascular risk factor linked to atherosclerosis and endothelial dysfunction.
  • Chronic renal failure (CRF) is associated with both hyperhomocysteinemia and atherosclerosis.
  • The impact of folic acid on vascular events in CRF patients remains unclear.

Purpose of the Study:

  • To investigate the effect of folic acid on endothelial function in patients with predialysis chronic renal failure.
  • To determine if folic acid supplementation can improve vascular health markers in this patient population.

Main Methods:

  • A prospective, double-blind, placebo-controlled study involving 100 predialysis CRF patients.
  • Patients received either 5 mg of folic acid or a placebo daily for 12 weeks.
  • Endothelial function was assessed via brachial artery dilation, serum nitrite/nitrate levels, and plasma von Willebrand factor concentration.

Main Results:

  • Folic acid supplementation significantly increased folate levels and reduced hyperhomocysteinemia compared to placebo.
  • No significant differences were observed in endothelium-dependent dilation, serum nitrite/nitrate, or plasma von Willebrand factor between the folic acid and placebo groups.
  • Folic acid treatment lowered but did not normalize hyperhomocysteinemia levels.

Conclusions:

  • High-dose folic acid effectively lowers, but does not normalize, hyperhomocysteinemia in predialysis CRF patients.
  • Folic acid supplementation did not improve endothelial function in this cohort.
  • These findings suggest that folic acid treatment may not mitigate the vascular disease burden associated with uremia.