The effect of beta-adrenergic receptor blocking agents on hypertensive action of noradrenaline injected into the lateral ventricle of rat brain.

Noradrenaline (NA), 100 microgram intraventricularly (ivtr), produces an evident hypertension, lasting for up to 15 min. A previous ivtr administration of propranolol (100 and 500 microgram), alprenolol (100 microgram), sotalol (100 microgram), (-)INPEA (100 microgram), (+)INPEA (100 microgram), Ko 1366 (100 and 200 microgram), or practolol (20 microgram) abolishes the hypertensive action of NA. The results indicate that the central nervous system of the rat contains structures similar to the peripheral beta-adrenoceptor, and that they are involved in the central regulation of circulation.