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. 1996 May;118(2):243–248. doi: 10.1111/j.1476-5381.1996.tb15394.x

Cerebrovascular responsiveness to NG-nitro-L-arginine methyl ester in spontaneously diabetic rats.

I P Fouyas 1, P A Kelly 1, I M Ritchie 1, I R Whittle 1
PMCID: PMC1909641  PMID: 8735622

Abstract

1. There is evidence that endothelial dysfunction is associated with diabetes mellitus. The purpose of the present study was to assess local cerebral blood flow (LCBF) and cerebrovascular responsiveness to the NOS inhibitor NG-nitro-L-arginine methyl ester (L-NAME) in spontaneously diabetic insulin-dependent BioBred (BB) rats. 2. Diabetic rats, and non-diabetic controls, were treated with L-NAME (30 mg kg-1, i.v.) or saline, 20 min prior to the measurement of LCBF by the fully quantitative [14C]-iodoantipyrine autoradiographic technique. 3. There were no significant differences in physiological parameters (blood pH, PCO2, and PO2, rectal temperature, arterial blood pressure, or plasma glucose) between any of the groups of rats, and no difference in either the extent or the temporal characteristics of the hypertensive response to L-NAME between diabetic and non-diabetic rats. 4. In diabetic rats, a global reduction in basal LCBF was observed, although significant reductions (between -20 and -30%) were found in only 5 (mainly subcortical) out of the 13 brain regions measured. Following L-NAME injection, significant reductions in LCBF (between -20 and -40%) were found in the non-diabetic animals. In diabetic animals treated with L-NAME, a significant reduction in LCBF was measured only in the hypothalamus (-33%). 5. The cerebrovascular response to acute L-NAME is attenuated in spontaneously diabetic insulin-dependent BB rats. This would be consistent with the endothelial dysfunction in cerebral vessels, known to be associated with diabetes mellitus and it is possible that a loss of NO-induced dilator tone, amongst other factors, may underlie the observed reductions of basal LCBF in these animals.

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Selected References

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