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The effect of somatostatin and its two tetrapeptide fragments was investigated on turning activity induced by unilateral substantia nigra lesion in rats. Somatostatin in a dose of 0.6 nM had no action on the turning behavior, while a dose of 6 nM increased slightly while a dose of 12 nM significantly the contralateral turning. Cys-Lys-Asn-Phe and Phe-Trp-Lys-Thr had no action in low or high doses on the turning activity of the animals. The results suggest that somatostatin has a direct postsynaptic dopamine receptor stimulating effect. It seems that for dopamine receptor stimulating action the complete somatostatin molecule is needed.
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