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ADMA regulates angiogenesis: genetic and metabolic evidence

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA, Centre for Clinical Pharmacology, Department of Medicine, University College London, London, UK

HK Ho

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA

C Heeschen

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA

M Stuehlinger

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA

JJ Jang

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA

M Kimoto

Department of Nutritional Science, Okayama Prefectural University, Kuboki, Japan

P Vallance

Centre for Clinical Pharmacology, Department of Medicine, University College London, London, UK

JP Cooke

Department of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, USA, john.cooke{at}stanford.edu

Endothelium-derived nitric oxide (NO) plays an important role in transducing the effects of angiogenic factors. Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of NO synthase (NOS). We used a murine model of hindlimb ischemia to investigate whether genetic or metabolic changes in ADMA levels could impair angiogenic response in vivo. Hindlimb ischemia was surgically induced in C57BL/6J mice, apo E-deficient mice, or transgenic mice overexpressing dimethylarginine dimethylaminohydrolase (DDAH). Some animals were also treated with the NOS antagonist L-nitro-arginine, or the NO precursor L-arginine. Angiogenesis was quantified in the hindlimb skeletal muscle by capillary/myocyte ratio. Plasma or tissue ADMA levels were measured by HPLC. In normal mice, hindlimb ischemia increased tissue ADMA twofold, and reduced DDAH and NOS expression. This was associated with a reduced NOS activity (by over 80%) three days following surgery. On day seven, a threefold increase in DDAH expression and a fall in tissue ADMA levels were associated with a sevenfold increase in NOS activity, whereas NOS expression did not increase above baseline. In DDAH transgenic mice, the elevation of ADMA and decrement in NOS activity was blunted during hindlimb ischemia. Plasma ADMA levels were increased in apo E-mice (1.79 ± 0.45 versus 1.07 ± 0.08 µmol/l; p = 0.008). Capillary index was significantly reduced in apo E-mice up to seven weeks after surgery (0.25 ± 0.05 versus 0.62 ± 0.08; p < 0.001). The effect of hypercholesterolemia on capillary index was reversed by L-arginine, and (in wild-type mice) mimicked by administration of the NOS antagonist L-nitro-arginine. In conclusion, metabolic or genetic changes in plasma and tissue ADMA levels affect tissue NO production and angiogenic response to ischemia.

Key Words: dimethylarginine dimethylaminohydrolase • endothelium • ischemia • nitric oxide • peripheral arterial disease

Vascular Medicine, Vol. 10, No. 1, 7-14 (2005)
DOI: 10.1191/1358863x05vm580oa


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