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- W2023154907 abstract "Intraperitoneal administration of cholecystokinin octapeptide sulphate ester (CCK-8-SE) and nonsulphated cholecystokinin octapeptide (CCK-8-NS) enhanced the latency of seizures induced by picrotoxin in mice. Experiments with N- and C-terminal fragments revealed that the C-terminal tetrapeptide (CCK-5-8) was the active centre of the CCK octapeptide molecule. The analogues CCK-8-SE and CCK-8-NS (dose range 0.2–6.4 μmol/kg) and caerulein dose range 0.1–0.8 μmol/kg) showed bell-shaped dose-effect curves, with the greatest maximum inhibition for CCK-8-NS. The peptide CCK-5-8 had weak anticonvulsant activity in comparison to the octapeptides, 3.2 μmol/kg and larger doses of the reference drug, diazepam, totally prevented picrotoxin-induced seizures and mortality. The maximum effect of the peptides tested was less than that of diazepam. Experiments with analogues and derivatives of CCK-5–8 demonstrated that the effectiveness of the β-alanyl derivatives of CCK-5-8 were enhanced and that they were equipotent with CCK-8-SE. Of the CCK-2–8 analogues, Ser(SO3H)7-Ac-CCK-2-8-SE and Thr(SO3H)7-Ac-CCK-2-8-SE and Hyp(SO3H)-Ac-CCK-2-8-SE were slightly more active than CCK-8-SE." @default.
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- W2023154907 date "1983-10-01" @default.
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- W2023154907 title "Structure-activity and dose-effect relationships of the antagonism of picrotoxin-induced seizures by cholecystokinin, fragments and analogues of cholecystokinin in mice" @default.
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- W2023154907 doi "https://doi.org/10.1016/0028-3908(83)90085-0" @default.
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