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. 1991 Feb;102(2):386–390. doi: 10.1111/j.1476-5381.1991.tb12183.x

5-HT1-like receptors mediate 5-hydroxytryptamine-induced contraction of guinea-pig isolated iliac artery.

I Sahin-Erdemli 1, D Hoyer 1, A Stoll 1, M P Seiler 1, P Schoeffter 1
PMCID: PMC1918042  PMID: 1849768

Abstract

1. The effects of 5-hydroxytryptamine (5-HT) and of the 5-HT1-like receptor agonists, 5-carboxamidotryptamine (5-CT) and sumatriptan (GR43175) were investigated in isolated ring preparations of guinea-pig common iliac artery. 2. The three agonists induced very weak, if any, contractions of unstimulated preparations, whereas they elicited concentration-dependent contractions in preparations given a moderate tone by a threshold concentration of prostaglandin F2 alpha (PGF2 alpha). 3. Under the latter conditions, Emax values for 5-HT and 5-CT reached about 45% of PGF2 alpha maximal effect, whereas the Emax value of sumatriptan was significantly lower (about 35%). The rank order of potency (mean EC50 value, nM) was 5-CT (6.6) greater than 5-HT (22.9) greater than sumatriptan (155). Pargyline, cocaine or deoxycorticosterone were without significant effect on the contractions induced by 5-HT. 4. The 5-HT3 receptor antagonist, (1 alpha H, 3 alpha,5 alpha H-tropan-3-yl) 1-H-indole-3-carboxylic acid ester (ICS 205-930; 1 microM), had no effect on 5-HT-, 5-CT- and sumatriptan-induced contractions. 5. The 5-HT2 receptor antagonist, ketanserin (1 microM) caused only small rightward shifts (concentration-ratios, about 2) in the concentration-response curves to 5-HT, 5-CT and sumatriptan without significantly depressing the maximum effects. 6. In the presence of ketanserin (1 microM), the non-selective 5-HT receptor antagonist, methiothepin (0.1 microM), shifted the concentration-response curves to 5-HT and 5-CT to the right in a parallel manner and to a similar extent for both agonists (respective mean pKB values, 8.07 and 8.27).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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