Long-lasting mnemotropic effect of substance P and its N-terminal fragment (SP1-7) on avoidance learning
| Autor: | C. Tomaz, A.C.F. Silva, P.J.C. Nogueira |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Brazilian Journal of Medical and Biological Research, Vol 30, Iss 2, p 231 (1997) |
| Druh dokumentu: | article |
| ISSN: | 0100-879X 1414-431X |
| DOI: | 10.1590/S0100-879X1997000200011 |
| Popis: | We investigated the long-lasting effect of peripheral injection of the neuropeptide substance P (SP) and of some N- or C-terminal SP fragments (SPN and SPC, respectively) on retention test performance of avoidance learning. Male Wistar rats (220 to 280 g) were trained in an inhibitory step-down avoidance task and tested 24 h or 21 days later. Immediately after the training trial rats received an intraperitoneal injection of SP (50 µg/kg), SPN 1-7 (167 µg/kg) or SPC 7-11 (134 µg/kg). Control groups were injected with vehicle or SP 5 h after the training trial. The immediate post-training administration of SP and SPN, but not SPC, facilitated avoidance behavior in rats tested 24 h or 21 days later, i.e., the retention test latencies of the SP and SPN groups were significantly longer (P |
| Databáze: | Directory of Open Access Journals |
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