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. 1992 Feb;105(2):293–296. doi: 10.1111/j.1476-5381.1992.tb14248.x

Bradykinin receptors in the guinea-pig taenia caeci are similar to proposed BK3 receptors in the guinea-pig trachea, and are blocked by HOE 140.

J L Field 1, J M Hall 1, I K Morton 1
PMCID: PMC1908656  PMID: 1313723

Abstract

1. Bradykinin (BK) receptors of the guinea-pig taenia caeci were compared with those of the guinea-pig trachea, a preparation proposed to possess novel BK3 receptors. 2. Bradykinin-evoked contractile responses were unaffected in both preparations by the selective BK1 receptor antagonist [des-Arg9,Leu8]-BK (1 microM-10 microM). The BK2 receptor antagonists, D-Arg-[Hyp3,D-Phe7]-BK and D-Arg-[Hyp3,Thi5,8,D-Phe7]-BK, both had low affinities (apparent pKB estimates less than 6) which did not differ significantly between the two preparations (P greater than 0.05). In contrast, the novel bradykinin receptor antagonist D-Arg-[Hyp3,Thi5,D-Tic7,Oic8]-BK (HOE 140) potently antagonized responses to bradykinin with relatively high affinity (apparent pKB = 8.42 +/- 0.15 and 8.94 +/- 0.16 in the taenia caeci, and trachea, respectively). 3. We conclude that the bradykinin receptors in the guinea-pig taenia caeci have similar recognition properties to those present in the guinea-pig trachea, and in this respect the taenia caeci represents a useful preparation for the further study of proposed novel BK3 receptors.

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Selected References

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