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. 1991 Sep;104(1):53–58. doi: 10.1111/j.1476-5381.1991.tb12384.x

Effects of NG-substituted analogues of L-arginine on NANC relaxation of the rat anococcygeus and bovine retractor penis muscles and the bovine penile artery.

X R Liu 1, J S Gillespie 1, I F Gibson 1, W Martin 1
PMCID: PMC1908302  PMID: 1786518

Abstract

1. The effects of two inhibitors of nitric oxide synthase, NG-monomethyl L-arginine (L-NMMA) and NG-nitro L-arginine (L-NOARG), were examined on non-adrenergic non-cholinergic (NANC) inhibitory transmission in the rat anococcygeus, bovine retractor penis (BRP) and bovine penile artery. 2. In the rat anococcygeus, L-NMMA (10-1000 microM) produced a concentration-dependent augmentation of guanethidine (30 microM)-induced tone and inhibited NANC relaxation at all frequencies tested (0.1-20 Hz): the maximum inhibition obtained was 56 +/- 6% (n = 6). L-NOARG (0.3-30 microM) also augmented tone and inhibited NANC relaxation in a concentration-dependent manner, but unlike L-NMMA the maximum inhibition was 100%. 3. In the BRP, L-NMMA (10-100 microM) had no effect on tone or NANC-induced relaxation, but at 1000 microM tone was increased and NANC relaxation inhibited by 25 +/- 7% (n = 6). L-NOARG (0.3-30 microM) produced a concentration-dependent increase in tone and inhibition of NANC relaxation. As in the rat anococcygeus, inhibition of NANC relaxation was complete. 4. The effects of L-NMMA and L-NOARG were stereospecific since D-NMMA (10-1000 microM) and D-NOARG (1-1000 microM) had no effect on tone or NANC relaxation of the rat anococcygeus or BRP. 5. L-Arginine (10-300 microM) had no effect by itself on NANC-induced relaxation of the rat anococcygeus or BRP. It did, however, reverse the ability of L-NMMA (10-1000 microM) to augment tone and inhibit NANC relaxation in the rat anococcygeus and BRP.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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