Abstract
Earlier studies have shown that the undecapeptide substance P (SP) alters motor behavior and dopamine metabolism following injection into the substantia nigra (SN) in rat, even though the SN appears largely devoid of SP-specific (NK-1) receptors. In this report, intra-nigral injections of the amino-terminal SP fragment SP(1–7) enhanced rearing, sniffing and locomotor activity, and increased the nigral DOPAC-to-DA ratio. In addition, SP(1–7) increased 3H-DA release from the SN in vitro. These findings suggest that some of the effects of nigral SP on motor behavior and dopamine release are mediated by amino-terminal fragments of SP.
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