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. 1989 Oct;98(2):619–629. doi: 10.1111/j.1476-5381.1989.tb12636.x

Multiple mechanisms in the motor responses of the guinea-pig isolated urinary bladder to bradykinin.

C A Maggi 1, R Patacchini 1, P Santicioli 1, P Geppetti 1, R Cecconi 1, S Giuliani 1, A Meli 1
PMCID: PMC1854696  PMID: 2479441

Abstract

1. Bradykinin (1 nm-1 microM) produced a contraction of bladder strips excised from the dome of the guinea-pig urinary bladder, an effect which was greatly enhanced by removal of the mucosal layer or by thiorphan (10 microM). All subsequent experiments were performed in mucosa-free strips and in the presence of thiorphan. 2. In carbachol (5 microM)-contracted strips, bradykinin produced a concentration (1 nm-1 microM)-dependent transient relaxation. 3. Kallidin was slightly more potent than bradykinin in producing a contraction and a relaxation of the carbachol-induced tone. By contrast, [des-Arg9]-bradykinin, a selective B1 receptor agonist was barely effective up to 1 microM. 4. The contractile response to bradykinin was: (a) unaffected by either tetrodotoxin (1 microM), in vitro capsaicin desensitization (10 microM for 30 min) or apamin (0.1 microM); (b) antagonized by indomethacin (5 microM), the prostaglandin receptor antagonist SC-19220 (100 microM) or the B2 receptor antagonist [D-Arg0, Hyp3, Thi5,8, Phe7]-bradykinin (10 micron) and (c) almost abolished by nifedipine (1 microM). 5. The antagonism of the contractile response to bradykinin produced by indomethacin and SC-19220 was non-additive while that produced by indomethacin and the B2 receptor antagonist was additive. 6. The relaxant response to bradykinin was unaffected by tetrodotoxin, in vitro capsaicin desensitization or indomethacin but antagonized in a competitive manner by the B2 receptor antagonist. Further, this response was abolished by apamin (0.1 microM) but unaffected by glibenclamide (1 microM). 7. Bradykinin (10 microM) produced a consistent release of calcitonin gene-related peptide-like immunoreactivity (CGRP-LI) but not substance P-LI from the guinea-pig bladder muscle. CGRP-LI release by bradykinin was greatly reduced in bladders exposed to indomethacin. [des-Arg9]-bradykinin (10 microM) was ineffective. 8. We conclude that: (a) bradykinin-induced contraction involves activation of both B2 receptors and prostanoid synthesis, via distinct mechanisms which act by inducing calcium influx via nifedipine-sensitive channels; (b) bradykinin-induced relaxation involves activation of B2 receptors and opening of apamin-sensitive potassium channels; (c) bradykinin stimulates sensory nerves in this tissue largely via prostanoid production.

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Selected References

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