Abstract:
:The aim of this paper is to study the synergistic anti-analgesic effect of angiotensin II (Ang II) plus cholecystokinin octapeptide (CCK-8). Our previous studies have shown that both CCK-8 and Ang II are potent anti-opioid substances. Intracerebroventricular (i.c.v.) injection of CCK-8 or Ang II dose-dependently antagonizes morphine-induced analgesia (MIA). In the present study, we observed the combined effect of CCK-8 and Ang II in antagonizing MIA. CCK-8 and Ang II were injected intracerebroventricularly to rats in various proportions and doses. The results were analyzed with isobolographic analysis. Combined injection of CCK-8 and Ang II in a ratio of 1 ng: 2.5 microg or 1 ng: 5 microg produced significantly greater effect in antagonizing MIA. The ED(50) of the two ratios are only 18.5% and 27.5%, respectively, of the theoretical dose of simple addition. We conclude that CCK-8 and Ang II used in such dose ratios may antagonize MIA synergistically.
journal_name
Painjournal_title
Painauthors
Han NL,Luo F,Bian ZP,Han JSdoi
10.1016/S0304-3959(99)00294-8keywords:
subject
Has Abstractpub_date
2000-04-01 00:00:00pages
465-469issue
3eissn
0304-3959issn
1872-6623pii
00006396-200004010-00016journal_volume
85pub_type
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