Medizinische Universität Graz - Research portal
Selected Publication:
Stanger, O; Semmelrock, HJ; Wonisch, W; Bös, U; Pabst, E; Wascher, TC.
Effects of folate treatment and homocysteine lowering on resistance vessel reactivity in atherosclerotic subjects.
J Pharmacol Exp Ther. 2002; 303(1):158-162
Doi: 10.1124/jpet.102.036715
[OPEN ACCESS]
Web of Science
PubMed
FullText
FullText_MUG
Google Scholar
- Co-authors Med Uni Graz
- Aldenhoff Ursula
- Semmelrock Hans-Jürgen
- Wascher Thomas
- Wonisch Willibald
- Altmetrics:
- Dimensions Citations:
- Plum Analytics:
- Scite (citation analytics):
- Abstract:
- Hyperhomocysteinemia is associated with arterial hypertension and endothelial dysfunction in healthy humans. Placebo-controlled vitamin intervention studies cannot distinguish intrinsic actions of homocysteine (tHcy) and folate concentrations on the endothelium. The present two-period crossover study investigates the effects of tHcy lowering through oral folic acid on antioxidant status and resistance vessel reactivity in patients with established coronary artery disease (CAD). We investigated 27 male patients with angiographically documented multivessel CAD aged 50 (range 46-56) years. Resistance vessel reactivity was assessed by measurement of postischemic reactive hyperemia (RH) in the forearm using venous occlusion plethysmography at baseline, after 6 weeks of treatment with 5 mg of oral folic acid, and after a washout period of another 6 weeks. Plasma folate increased 3.49-fold with a mean tHcy reduction of 21.3%. Peak reactivity of resistance vessels improved significantly (18.97-23.60 ml/min(-1) per 100 ml; P = 0.01) with unchanged total antioxidant status (TAS; 0.912-0.944 microM; P = 0.4). This effect was limited to subjects (n = 14) with a tHcy reduction >2 microM (median reduction, 14.4-9.6 microM, P < 0.001). In the 13 subjects with a below-median reduction, tHcy remained unaltered (9.7-9.6 microM, P = 0.88) and TAS increased significantly (0.923-1.055 microM, P = 0.006), whereas RH peak flow was not affected (20.22-22.99 ml/min(-1) per 100 ml, P = 0.28). Homocysteine lowering >2 microM through folic acid supplementation improves resistance vessel reactivity in patients with CAD. Our data support the hypothesis that homocysteine lowering may have intrinsic vasoprotective effects largely independent of folate.
- Find related publications in this database (using NLM MeSH Indexing)
- Arteriosclerosis - blood Arteriosclerosis - drug therapy Arteriosclerosis - physiopathology
- Blood Flow Velocity - drug effects
- Cholesterol - blood
- Coronary Disease - blood Coronary Disease - drug therapy
- Cross-Over Studies -
- Folic Acid - blood Folic Acid - therapeutic use
- Forearm - blood supply
- Homocysteine - blood
- Humans -
- Male -
- Middle Aged -
- Placebos -
- Regional Blood Flow - drug effects
- Triglycerides - blood
- Vascular Resistance - drug effects Vascular Resistance - physiology
- Vitamin B 12 - blood