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. 1995 Mar;114(5):919–924. doi: 10.1111/j.1476-5381.1995.tb13291.x

Impairment of nitrergic-mediated relaxation of rat isolated duodenum by experimental diabetes.

M A Martinez-Cuesta 1, H Massuda 1, B J Whittle 1, S Moncada 1
PMCID: PMC1510331  PMID: 7540094

Abstract

1. Diabetes mellitus is associated with changes in gastrointestinal motility. The effects of experimental diabetes, induced by streptozotocin administration to rats 3-4 weeks previously, on the nitric oxide (NO)-mediated (nitrergic) relaxation of the duodenum have now been investigated. 2. The non-adrenergic, non-cholinergic (NANC) relaxation of the isolated duodenum induced by nicotine (0.3-10 microM) or the nicotinic agonist, 1,1-dimethyl-4-phenylpiperazinium (DMPP; 10 microM) was inhibited by the NO synthase inhibitor, NG-nitro-L-arginine (3-100 microM). 3. This nitrergic relaxation induced by nicotine or DMPP of the duodenum from diabetic rats was substantially smaller than that of the tissue from control rats. 4. By contrast, the relaxation of the duodenum from diabetic rats to the NO donor, nitroprusside (0.3-10 microM) was similar to that of control tissue, whereas the relaxation to ATP (0.1-3 microM) was enhanced to a small but significant degree. 5. Incubation of duodenal tissue from control rats at 4 degrees C for 72 h, which leads to neuronal disruption, significantly attenuated the relaxation to nicotine or DMPP whereas the relaxation induced by nitroprusside or ATP was not affected. Comparable cold-storage did not affect the endothelium-dependent relaxation of rat aortic rings induced by acetylcholine (0.01-2 microM). 6. The calcium-dependent NO synthase activity in duodenal tissue, determined by the conversion of radiolabelled L-arginine to citrulline, was significantly reduced in cold-stored tissue and in tissue obtained from diabetic rats. 7. These findings in the rat duodenum indicate that a reduction in intestinal NO synthase activity is associated with an impairment of the NANC relaxation.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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