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- W2034143807 abstract "1. Electrical field stimulation (EFS) (1-10 Hz, 30 V, 2 ms) of frog oesophageal body strips resulted in frequency-dependent non-adrenergic, non-cholinergic (NANC) relaxations. 2. Tetrodotoxin (TTX) (10(-6)-10(-5) M) had no effect on EFS evoked relaxations with a 2 ms pulse width. At a pulse width of 0.5 ms only the responses to the highest frequency (10 Hz) were significantly inhibited by TTX at 10(-5) M. Relaxation at 2 ms pulse width were unaffected by omega-conotoxin (10(-6) M), nifedipine (10(-6) M) or cobalt (5 x 10(-4) M). 3. NG-nitro-L-arginine (L-NOARG) (10(-6)-10(-4) M), a nitric oxide synthase (NOS) inhibitor, caused a concentration-dependent inhibition of the EFS-induced NANC relaxant responses. The inhibitory effect of L-NOARG was both prevented and reversed by L-arginine but not D-arginine (5 x 10(-3) M). 4. The phosphodiester type V inhibitor (PDE V), SK&F 96231 (10(-7)-10(-4) M), caused a concentration-dependent potentiation of both the percentage relaxation and the duration of the relaxant responses to EFS. 5. ODQ (10(-7)-10(-5) M), a guanylate cyclase inhibitor, produced a concentration-dependent inhibition of EFS-evoked NANC relaxations. 6. Oxyhaemoglobin (10(-6) M), which binds nitric oxide (NO), inhibited NANC relaxations to EFS. 7. The NO donor sodium nitroprusside (SNP) (10(-8)-10(-4) M) produced a concentration-dependent inhibition of evoked tone. L-NOARG (10(-4) M) had no effect on the SNP evoked relaxations. Preincubation with oxyhaemoglobin (10(-6) M) caused a reduction in the SNP (10(-6)-10(-5) M) induced relaxations. 8. These results suggest NO is the relaxant transmitter of the frog oesophageal body and the source of NO may be non-neuronal." @default.
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- W2034143807 title "Evidence for a role for nitric oxide in relaxation of the frog oesophageal body to electrical field stimulation" @default.
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- W2034143807 doi "https://doi.org/10.1038/sj.bjp.0701298" @default.
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