6 Hydroxy dopamine was administered into the 3rd ventricle of adult male rats. After 2 successive 250 μg doses of 6 OH dopamine, the levels of norepinephrine and dopamine in the median eminence and arcuate nucleus fell to 15-20% of the control value. The amount of luteinizing hormone releasing hormone (LH RH) in these same hypothalamic areas, however, was unchanged. LH RH containing cells are distinct from catecholaminergic neurons.
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