RESUMO
The influence of angiotensin-converting enzyme on endotheliun-dependent contractile vascular reactions was investigated on the rat model of streptozotocin-induced diabetes mellitus. It is shown, that the long-term administration of enalapril results in partial restoration of disturbed at diabetes mellitus reactions and also to reduction of oxygen cost of smooth muscles and myocardial work. Thus, after 28-day's of oral administration of this drug the restoration of endotheliun-dependent dilatation of aorta and coronary vessels, increase of stretch-induced contractile responses of vascular smooth muscles, reduction of stiffness of isolated portal vein strips are observed. Possible mechanisms of such changes are following: increase of nitric oxide synthesis (at the expense of constitutive NOS activity) and reduction of oxidative stress, to what the decrease of diene conjugates contents in tissues of animals with diabetes mellitus after long introduction of enalapril testifies.
