Abstract
The analgesic action of β-endorphin, as observed in the hot plate test with rats, was effectively suppressed by intracerebroventricular (i.c.v.) injection of caerulein and cholecystokinin octapeptide (CCK-8). The effect of caerulein was particularly striking; this peptide in doses of more than 0.09 nM lessened or abolished the analgesic effect of β-endorphin in a dose of 0.7 nM. On the other hand, non sulfated CCK-8 had no significant effect on β-endorphin-induced analgesia.
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