1. Hydrallazine relaxes the rat tail artery by a direct action on vascular smooth muscle cells, which appears to be modulated by the action of sympathetic nerve terminals.

2. There is a gradient of response to hydrallazine in arteries from normotensive Wistar rats, the proximal segments being poorly responsive. This gradient disappears after denervation with 6-hydroxydopamine in vitro.

3. Exogenously added purines inhibit noncompetitively the vasodilator response to hydrallazine in denervated segments from normotensive Wistar rats. Their order of potency is 2-Cl-adenosine > adenosine > ATP > inosine.

4. The effect of hydrallazine in innervated, poorly responsive segments is greatly potentiated by theophylline (50 μmol/l) and propranolol (5 μmol/l). These results, together with the effect of denervation, suggest that there are endogenous purines leaking from the nerve terminals under our experimental conditions.

5. Hydrallazine produces a marked inhibition of stimulus-induced contraction and 3H release after [3H]noradrenaline loading. The mechanism of this prejunctional action appears to be different from the mechanism of the postjunctional effect.

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