Early diabetes in WKY and SHR produces decrease of the responses to angiotensin II and 5-HT and changes in the NO-GMPc pathway.

Early stages of diabetes have been related to arterial impairment in the vasoconstriction to norepinephrine. For that reason, the aim of this work was to investigate possible changes in the reactivity to angiotensin II and 5-HT in pithed rats and to evaluate the responses of aortic rings to acetylcholine and sodium nitroprussiate in streptozotocin-induced diabetes with 4 weeks evolution in both Wistar-Kyoto (WKY) and Spontaneously hypertensive rats (SHR). Our results suggest that hypertension produces a greater decrease in the vasoconstrictor response to angiotensin II and 5-HT in early stages of diabetes, while the NO-GMPc pathway could be involved such effect.