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Title: Evidence for the existence of a constitutive nitric oxide synthase in vascular smooth muscle
Authors: Cheah, L.S.
Gwee, M.C.E. 
Das, R.
Ballard, H.
Yang, Y.F.
Daniel, E.E.
Kwan, C.Y.
Keywords: Aorta
Cell membrane
Field stimulation
Nitric oxide synthase
Vascular smooth muscle
Issue Date: 2002
Citation: Cheah, L.S., Gwee, M.C.E., Das, R., Ballard, H., Yang, Y.F., Daniel, E.E., Kwan, C.Y. (2002). Evidence for the existence of a constitutive nitric oxide synthase in vascular smooth muscle. Clinical and Experimental Pharmacology and Physiology 29 (8) : 725-727. ScholarBank@NUS Repository.
Abstract: 1. We have identified a neuronal nitric oxide synthase (NOS)-like constitutive form of NOS in vascular smooth muscle (VSM) using a functional contractility approach as well as immunohistochemical methods. 2. NG-Nitro-L-arginine methyl ester, NG-monomethyl-L-arginine and NG-nitro-L-arginine (L-NOARG), the competitive inhibitors of NOS, inhibited Mg2+-induced relaxation of de-endothelialized rat aorta precontracted with phenylephrine (PE). This Mg2+ relaxation of VSM was not affected by inhibitors of inducible NOS. 3. Electrical field stimulation (EFS; 30-70 Hz) caused relaxation of rat aorta in the presence of tetrodotoxin (therefore not a neurogenic effect) and this EFS relaxation was effectively inhibited by L-NOARG, oxyhemoglobin and methylene blue. 4. Immunohistochemical studies of dog saphenous vein using antibodies raised against neuronal NOS indicated prominent staining along the plasmalemma in a punctate pattern similar to the distribution of antibodies against caveolin-1, a major constituent of the plasmalemmal caveolae. 5. We propose that a constitutive NOS of non-endothelial, non-neuronal origin is present in a special caveolae domain of VSM cell membranes and could be activated by an ionic mechanism yet to be characterized.
Source Title: Clinical and Experimental Pharmacology and Physiology
ISSN: 03051870
DOI: 10.1046/j.1440-1681.2002.03707.x
Appears in Collections:Staff Publications

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