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Bradykinin effects in guinea pig tracheal epithelial cells are mediated through a B2 kinin receptor and can be inhibited by the selective antagonist Hoe 140.
J Pharmacol Exp Ther. 1993 Mar; 264(3):1124-31.JP

Abstract

Attempts to evaluate the role of kinins in airway inflammation in humans using the bradykinin receptor antagonist [DArg0-Hyp3-DPhe7]-bradykinin (NPC 567) were unsuccessful, possibly because of the low potency and poor stability of this compound. Recently, [DArg0-Hyp3-Thi5-DTic7-Oic8]-bradykinin (Hoe 140), a novel antagonist that seems to overcome these weaknesses, has been developed. The present study was performed to compare the potency and efficacy of Hoe 140 to those of NPC 567 and another antagonist, [DArg0-Hyp3-DPhe7-Ile8]-bradykinin (B7418), on kinin receptors on guinea pig tracheal epithelial cells. Radioligand binding studies showed the presence of two types of B2 kinin receptors on guinea pig tracheal epithelial cells: a high-affinity site with a Kd of 0.44 nM and Bmax of 12.1 fmol/10(6) cells (4000 sites/cell), and a lower affinity site with a Kd of 10 nM and Bmax of 16 fmol/10(6) cells (9600 sites/cell). Bradykinin-induced prostaglandin E2 production seemed to be associated primarily with the lower affinity site. All three B2 receptor antagonists displaced labeled bradykinin from both classes of binding sites and inhibited bradykinin-induced prostaglandin E2 production, but Hoe 140 was up to 40-fold more potent than NPC 567 and showed an affinity comparable to that of bradykinin for both binding sites. This higher potency of Hoe 140, and its stability against peptidases, suggests that this compound will be useful in evaluating the role of bradykinin in inflammatory diseases of the airways.

Authors+Show Affiliations

Johns Hopkins University School of Medicine, Department of Medicine, Baltimore, Maryland.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8383737

Citation

Proud, D, et al. "Bradykinin Effects in Guinea Pig Tracheal Epithelial Cells Are Mediated Through a B2 Kinin Receptor and Can Be Inhibited By the Selective Antagonist Hoe 140." The Journal of Pharmacology and Experimental Therapeutics, vol. 264, no. 3, 1993, pp. 1124-31.
Proud D, Reynolds CJ, Broomfield J, et al. Bradykinin effects in guinea pig tracheal epithelial cells are mediated through a B2 kinin receptor and can be inhibited by the selective antagonist Hoe 140. J Pharmacol Exp Ther. 1993;264(3):1124-31.
Proud, D., Reynolds, C. J., Broomfield, J., Goldman, D. W., & Bathon, J. M. (1993). Bradykinin effects in guinea pig tracheal epithelial cells are mediated through a B2 kinin receptor and can be inhibited by the selective antagonist Hoe 140. The Journal of Pharmacology and Experimental Therapeutics, 264(3), 1124-31.
Proud D, et al. Bradykinin Effects in Guinea Pig Tracheal Epithelial Cells Are Mediated Through a B2 Kinin Receptor and Can Be Inhibited By the Selective Antagonist Hoe 140. J Pharmacol Exp Ther. 1993;264(3):1124-31. PubMed PMID: 8383737.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Bradykinin effects in guinea pig tracheal epithelial cells are mediated through a B2 kinin receptor and can be inhibited by the selective antagonist Hoe 140. AU - Proud,D, AU - Reynolds,C J, AU - Broomfield,J, AU - Goldman,D W, AU - Bathon,J M, PY - 1993/3/1/pubmed PY - 1993/3/1/medline PY - 1993/3/1/entrez SP - 1124 EP - 31 JF - The Journal of pharmacology and experimental therapeutics JO - J Pharmacol Exp Ther VL - 264 IS - 3 N2 - Attempts to evaluate the role of kinins in airway inflammation in humans using the bradykinin receptor antagonist [DArg0-Hyp3-DPhe7]-bradykinin (NPC 567) were unsuccessful, possibly because of the low potency and poor stability of this compound. Recently, [DArg0-Hyp3-Thi5-DTic7-Oic8]-bradykinin (Hoe 140), a novel antagonist that seems to overcome these weaknesses, has been developed. The present study was performed to compare the potency and efficacy of Hoe 140 to those of NPC 567 and another antagonist, [DArg0-Hyp3-DPhe7-Ile8]-bradykinin (B7418), on kinin receptors on guinea pig tracheal epithelial cells. Radioligand binding studies showed the presence of two types of B2 kinin receptors on guinea pig tracheal epithelial cells: a high-affinity site with a Kd of 0.44 nM and Bmax of 12.1 fmol/10(6) cells (4000 sites/cell), and a lower affinity site with a Kd of 10 nM and Bmax of 16 fmol/10(6) cells (9600 sites/cell). Bradykinin-induced prostaglandin E2 production seemed to be associated primarily with the lower affinity site. All three B2 receptor antagonists displaced labeled bradykinin from both classes of binding sites and inhibited bradykinin-induced prostaglandin E2 production, but Hoe 140 was up to 40-fold more potent than NPC 567 and showed an affinity comparable to that of bradykinin for both binding sites. This higher potency of Hoe 140, and its stability against peptidases, suggests that this compound will be useful in evaluating the role of bradykinin in inflammatory diseases of the airways. SN - 0022-3565 UR - https://www.unboundmedicine.com/medline/citation/8383737/Bradykinin_effects_in_guinea_pig_tracheal_epithelial_cells_are_mediated_through_a_B2_kinin_receptor_and_can_be_inhibited_by_the_selective_antagonist_Hoe_140_ L2 - https://jpet.aspetjournals.org/cgi/pmidlookup?view=long&pmid=8383737 DB - PRIME DP - Unbound Medicine ER -