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ADMA – Biomarker for Cardiovascular Risk
ADMA (Asymmetric Dimethylarginine) is an endogenous compound that inhibits nitric oxide production and serves as a biomarker for cardiovascular disease risk.
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ADMA (Asymmetric Dimethylarginine) is an endogenous compound that inhibits nitric oxide production and serves as a biomarker for cardiovascular disease risk.
What is ADMA?
ADMA (Asymmetric Dimethylarginine) is a naturally occurring amino acid derivative produced in the human body during protein metabolism. It circulates in the bloodstream and is widely recognized as an important biomarker for vascular health and cardiovascular disease risk.
Mechanism of Action
ADMA inhibits the enzyme eNOS (endothelial nitric oxide synthase), which is responsible for producing nitric oxide (NO). Nitric oxide plays a central role in relaxing blood vessel walls, regulating blood pressure, and protecting against atherosclerosis. Elevated ADMA levels lead to reduced NO availability, a condition known as endothelial dysfunction – an early indicator of vascular damage.
Causes of Elevated ADMA Levels
Several conditions and lifestyle factors can increase ADMA concentrations in the blood:
- High blood pressure (hypertension)
- Type 2 diabetes mellitus
- Chronic kidney disease
- Lipid metabolism disorders (hypercholesterolemia)
- Smoking and oxidative stress
- Obesity
- Heart failure
Clinical Significance
Elevated ADMA levels are associated with a higher risk of heart attack, stroke, and other cardiovascular events. Research shows that ADMA is an independent risk factor for mortality in patients with chronic kidney failure and heart disease. ADMA has also been linked to the development of pulmonary hypertension and preeclampsia (high blood pressure during pregnancy).
Diagnosis and Measurement
ADMA is measured from a blood sample, typically using high-performance liquid chromatography (HPLC) or immunological assays (ELISA). Normal plasma values typically range between 0.4 and 0.9 µmol/L. Values above this range may indicate an elevated cardiovascular risk. ADMA measurement is primarily used in research settings and specialized cardiovascular diagnostic centers.
Treatment Approaches
No standardized drug therapy specifically targeting ADMA reduction has been established to date. However, several interventions have shown a positive effect on ADMA levels:
- L-Arginine supplementation: The amino acid L-arginine can competitively counteract the effect of ADMA and support NO production.
- Statins: Cholesterol-lowering medications can reduce ADMA levels and improve endothelial function.
- ACE inhibitors and AT1 antagonists: These classes of antihypertensive drugs also demonstrate ADMA-lowering effects.
- Lifestyle modifications: Regular physical activity, smoking cessation, a healthy diet, and weight loss help normalize ADMA levels.
- Treatment of underlying conditions: Optimal management of diabetes, hypertension, or kidney disease is essential.
Summary
ADMA is a significant endogenous inhibitor of nitric oxide synthesis and an established biomarker for endothelial dysfunction and cardiovascular risk. Measuring ADMA levels enables early assessment of vascular health status and can contribute to optimizing preventive strategies in at-risk patients.
References
- Vallance P, Leone A, Calver A, Collier J, Moncada S. Accumulation of an endogenous inhibitor of nitric oxide synthesis in chronic renal failure. Lancet. 1992;339(8793):572-575.
- Zoccali C, Bode-Böger SM, Mallamaci F, et al. Plasma concentration of asymmetrical dimethylarginine and mortality in patients with end-stage renal disease: a prospective study. Lancet. 2001;358(9299):2113-2117.
- Boger RH. Asymmetric dimethylarginine (ADMA) and cardiovascular disease: insights from prospective clinical trials. Vascular Medicine. 2005;10(Suppl 1):S19-S25.
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