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Abstract

Effects of 6-hydroxydopamine and reserpine on amphetamine-induced release of norepinephrine in rat cerebral cortex.

A Kalisker, J C Waymire and C O Rutledge
Journal of Pharmacology and Experimental Therapeutics April 1975, 193 (1) 64-72;
A Kalisker
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J C Waymire
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C O Rutledge
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Abstract

Amphetamine released 3-H-norepinephrine from rat cerebral cortex tissue which had previously accumulated the 3-H-amine. Destruction of noradrenergic nerve endings by pretreatment of the rats with 6-hydroxydopamine inhibited the accumulation of 3-H-norepinephrine by the tissue and reduced the proportion of the 3-H-amine which was released by amphetamine. Inhibition of storage of 3-H-norepinephrine within nerve endings by pretreatment of the animals with reserpine also reduced accumulation of 3-H-norepinephrine but did not reduce the proportion of the accumulated 3-H-amine which was released by amphetamine. The addition of desipramine (an inhibitor of neuronal uptake) further reduced the accumulation of 3-H-norepinephrine in animals pretreated with reserpine but had no further effect in animals pretreated with 6-hydroxydopamine. A greater proportion of the 3-H-norepinephrine was converted to 3-H-deaminated metabolites in tissues of reserpine-treated animals than in the tissues of control or 6-hydroxydopamine-treated rats. Amphetamine-induced release of 3-H-norepinephrine was partially calcium dependent in tissues from control animals. After reserpine treatment, amphetamine-induced release of norepinephrine was independent of calcium, whereas potassium-mediated release was still markedly calcium dependent. These experiments indicate that amphetamine releases 3-H-norepinephrine primarily from storage sites within central adrenergic nerve endings. An analysis of the time course of release from tissues of rats treated with reserpine suggests that amphetamine is equally capable of releasing 3-H-norepinephrine from granular sites which are susceptible to reserpine and from reserpine-insensitive sites.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 193, Issue 1
1 Apr 1975
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Abstract

Effects of 6-hydroxydopamine and reserpine on amphetamine-induced release of norepinephrine in rat cerebral cortex.

A Kalisker, J C Waymire and C O Rutledge
Journal of Pharmacology and Experimental Therapeutics April 1, 1975, 193 (1) 64-72;

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Abstract

Effects of 6-hydroxydopamine and reserpine on amphetamine-induced release of norepinephrine in rat cerebral cortex.

A Kalisker, J C Waymire and C O Rutledge
Journal of Pharmacology and Experimental Therapeutics April 1, 1975, 193 (1) 64-72;
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