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Evidence that angiotensin II enhances apomorphine-induced jaw movements via AT1 receptors in the ventrolateral striatum: studies by magnet-sensing system in freely moving rats.

The role of angiotensin AT(1) receptors in the ventrolateral striatum in modulating apomorphine-induced jaw movements was studied using a magnet-sensing system combined with an intracerebral drug microinjection technique in freely moving rats. Bilateral injections of angiotensin II (1 and 2 micro g/0.2 micro l in each side) into the ventrolateral striatum, which alone did not significantly elicit jaw movements, dose-dependently enhanced apomorphine (1 mg/kg i.v.)-induced repetitive jaw movements. The enhancement of apomorphine-induced jaw movements by angiotensin II (2 micro g) was dose-dependently antagonized by the angiotensin AT(1) receptor antagonist losartan (15 and 30 mg/kg i.p.), given 3 h before, while losartan (30 mg/kg i.p.) alone did not significantly affect the apomorphine (1 mg/kg)-induced jaw movements. These results indicate that angiotensin II enhances apomorphine-induced jaw movements via stimulation of angiotensin AT(1) receptors located in the ventrolateral striatum.