Abstract:
:NG-monomethyl-L-arginine (L-NMMA), an inhibitor of nitric oxide synthesis, markedly enhanced tonic ("hump") responses to transmural stimulation in guinea pig ileum longitudinal muscle. The enhancement of the hump responses was probably due to a prejunctional effect on substance P-like neurotransmission, since the action of L-NMMA was exerted also in the presence of atropine, and since responses to substance P, a mimic of nerve stimulation, were unaffected by L-NMMA as were cholinergic twitch responses and the overflow of [3H]choline. Further in support, the hump responses were blocked by the substance P antagonist Spantide. All effects of L-NMMA were stereospecifically reversed by L-arginine. Endogenous nitric oxide thus selectively modulates peptidergic neurotransmission in the gut.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Gustafsson LE,Wiklund CU,Wiklund NP,Persson MG,Moncada Sdoi
10.1016/s0006-291x(05)81028-9subject
Has Abstractpub_date
1990-11-30 00:00:00pages
106-10issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(05)81028-9journal_volume
173pub_type
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