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. 1995 Jun;115(3):409–414. doi: 10.1111/j.1476-5381.1995.tb16348.x

Effect of diabetes and elevated glucose on nitric oxide-mediated neurotransmission in rat anococcygeus muscle.

K J Way 1, J J Reid 1
PMCID: PMC1908417  PMID: 7582450

Abstract

1. Nitric oxide (NO)-mediated neurotransmission is impaired in anococcygeus muscle from 8-week streptozotocin-induced diabetic rats. This study investigated the effects of insulin treatment, and the duration of diabetes on this impairment. In addition, the effect of in vitro exposure to elevated glucose has been investigated on NO-mediated relaxations, in muscles from untreated rats. 2. Relaxant responses to field stimulation (0.5-5 Hz, 10s train), sodium nitroprusside (SNP; 5 and 10 nM) and NO (1 and 3 microM) were significantly impaired in anococcygeus muscles from 8-week diabetic rats, compared to responses from control rats. Insulin treatment (5 u Lente day-1, s.c.) of diabetic rats prevented the development of this impairment. 3. Consistent with findings in 8-week diabetic rats, relaxation induced by field stimulation, SNP and NO were attenuated in tissues from 2-week and 4-week diabetic rats compared to corresponding control responses, whereas relaxations to papaverine (3 and 10 microM) were not reduced. In contrast, diabetes of 3-days duration did not affect relaxations to field stimulation, SNP or NO. 4. Incubation of anococcygeus muscles from untreated rats in medium containing elevated glucose (44.1 mM) for 6 h, significantly impaired relaxations to field stimulation compared to responses obtained after normal glucose (11.1 mM) incubation. Relaxations to SNP and to NO were not affected by 6 h exposure to elevated glucose. Similarly, incubation in hyperosmolar solutions containing mannose or sucrose for 6 h, impaired relaxations to field stimulation, but not to SNP or NO.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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