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. 1991 Jun;103(2):1535–1541. doi: 10.1111/j.1476-5381.1991.tb09823.x

Tachykinin antagonists and capsaicin-induced contraction of the rat isolated urinary bladder: evidence for tachykinin-mediated cotransmission.

C A Maggi 1, R Patacchini 1, P Santicioli 1, S Giuliani 1
PMCID: PMC1908336  PMID: 1715797

Abstract

1. The possible involvement of tachykinins (TKs) in the contraction produced by capsaicin in the rat isolated urinary bladder was addressed on the hypothesis that co-release of substance P (SP) and neurokinin A (NKA) occurs from sensory nerve terminals. 2. A low concentration of SP (30 nM) produced a rapid contraction which faded to baseline within 10 min. A low concentration of NKA (10 nM) produced a slowly developing contraction which was still evident at 10 min. Capsaicin (1 microM) produced a rapid phasic response and a tonic response (late response to capsaicin). Co-administration of SP and NKA mimicked the response to capsaicin more than each TK alone. 3. Fading of the response to SP was not caused by receptor desensitization and was partially prevented by peptidase inhibitors. 4. Spantide (3 microM) selectively antagonized the SP-induced contraction while L-659,877 (3-10 microM) or MEN 10,376 (10-30 microM) which are NK2 receptor selective antagonists selectively blocked the response to NKA. Co-administration of spantide and L-659,877 inhibited the response to both SP and NKA by an amount not greater than that produced by each antagonist alone. 5. Spantide selectively reduced the peak response to capsaicin, while leaving the late response unaffected. L-659,877 (3 microM) and MEN 10,376 (10 microM) selectively inhibited the late response to capsaicin while, at higher concentrations, also reduced the peak response to capsaicin. Co-administration of spantide and L-659,877 reduced the peak response to capsaicin more than that produced by each antagonist alone. 6. Bombesin (10 nM) produced a tonic contraction similar to that induced by NKA.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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