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BIMM118<br />

Adrenergic System<br />

Termination of (nor)epinephrine action:<br />

• Reuptake into presynaptic nerve ending<br />

– Predominant mechanism<br />

– active transport; inhibited by Cocaine<br />

• Catechol-O-methyltransferase (COMT)<br />

– In the cytoplasm of post-junctional cells<br />

• Monoamino-oxidase (MAO)<br />

– In mitochondria of nerve and post-junctional cells<br />

• Presynaptic α2-receptors<br />

– Negative feedback that inhibits norepinephrine<br />

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