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Contractile mechanisms coupled to TRPA1 receptor activation in rat urinary bladder.
Biochem Pharmacol. 2006 Jun 28; 72(1):104-14.BP

Abstract

TRPA1 is a member of the transient receptor potential (TRP) channel family present in sensory neurons. Here we show that vanilloid receptor (TRPV1) stimulation with capsaicin and activation of TRPA1 with allyl isothiocyanate or cinnamaldehyde cause a graded contraction of the rat urinary bladder in vitro. Repeated applications of maximal concentrations of the agonists produce desensitization to their contractile effects. Moreover, contraction caused by TRPA1 agonists generates cross-desensitization with capsaicin. The TRP receptor antagonist ruthenium red (10-100 microM) inhibits capsaicin (0.03 microM), allyl isothiocyanate (100 microM) and cinnamaldehyde (300 microM)-induced contractions in the rat urinary bladder. The selective TRPV1 receptor antagonist SB 366791 (10 microM) blocks capsaicin-induced contraction, but partially reduces allyl isothiocyanate- or cinnamaldehyde-mediated contraction. However, allyl isothiocyanate and cinnamaldehyde (10-1000 microM) completely fail to interfere with the specific binding sites for the TRPV1 agonist [(3)H]-resiniferatoxin. Allyl isothiocyanate or cinnamaldehyde-mediated contractions of rat urinary bladder, which rely on external Ca(2+) influx, are significantly inhibited by tachykinin receptor antagonists as well as by tetrodotoxin (1 microM) or indomethacin (1 microM). Allyl isothiocyanate-induced contraction is not changed by atropine (1 microM) or suramin (300 microM). The exposure of urinary bladders to allyl isothiocyanate (100 microM) causes an increase in the prostaglandin E(2) and substance P levels. Taken together, these results indicate that TRPA1 agonists contract rat urinary bladder through sensory fibre stimulation, depending on extracellular Ca(2+) influx and release of tachykinins and cyclooxygenase metabolites, probably prostaglandin E(2). Thus, TRPA1 appears to exert an important role in urinary bladder function.

Authors+Show Affiliations

Department of Pharmacology, Federal University of Santa Catarina, CCB, Campus Universitário Trindade, 88049-900 Florianópolis, SC, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16725114

Citation

Andrade, Edinéia Lemos, et al. "Contractile Mechanisms Coupled to TRPA1 Receptor Activation in Rat Urinary Bladder." Biochemical Pharmacology, vol. 72, no. 1, 2006, pp. 104-14.
Andrade EL, Ferreira J, André E, et al. Contractile mechanisms coupled to TRPA1 receptor activation in rat urinary bladder. Biochem Pharmacol. 2006;72(1):104-14.
Andrade, E. L., Ferreira, J., André, E., & Calixto, J. B. (2006). Contractile mechanisms coupled to TRPA1 receptor activation in rat urinary bladder. Biochemical Pharmacology, 72(1), 104-14.
Andrade EL, et al. Contractile Mechanisms Coupled to TRPA1 Receptor Activation in Rat Urinary Bladder. Biochem Pharmacol. 2006 Jun 28;72(1):104-14. PubMed PMID: 16725114.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Contractile mechanisms coupled to TRPA1 receptor activation in rat urinary bladder. AU - Andrade,Edinéia Lemos, AU - Ferreira,Juliano, AU - André,Eunice, AU - Calixto,João B, Y1 - 2006/04/25/ PY - 2006/02/10/received PY - 2006/04/06/revised PY - 2006/04/07/accepted PY - 2006/5/27/pubmed PY - 2006/7/21/medline PY - 2006/5/27/entrez SP - 104 EP - 14 JF - Biochemical pharmacology JO - Biochem Pharmacol VL - 72 IS - 1 N2 - TRPA1 is a member of the transient receptor potential (TRP) channel family present in sensory neurons. Here we show that vanilloid receptor (TRPV1) stimulation with capsaicin and activation of TRPA1 with allyl isothiocyanate or cinnamaldehyde cause a graded contraction of the rat urinary bladder in vitro. Repeated applications of maximal concentrations of the agonists produce desensitization to their contractile effects. Moreover, contraction caused by TRPA1 agonists generates cross-desensitization with capsaicin. The TRP receptor antagonist ruthenium red (10-100 microM) inhibits capsaicin (0.03 microM), allyl isothiocyanate (100 microM) and cinnamaldehyde (300 microM)-induced contractions in the rat urinary bladder. The selective TRPV1 receptor antagonist SB 366791 (10 microM) blocks capsaicin-induced contraction, but partially reduces allyl isothiocyanate- or cinnamaldehyde-mediated contraction. However, allyl isothiocyanate and cinnamaldehyde (10-1000 microM) completely fail to interfere with the specific binding sites for the TRPV1 agonist [(3)H]-resiniferatoxin. Allyl isothiocyanate or cinnamaldehyde-mediated contractions of rat urinary bladder, which rely on external Ca(2+) influx, are significantly inhibited by tachykinin receptor antagonists as well as by tetrodotoxin (1 microM) or indomethacin (1 microM). Allyl isothiocyanate-induced contraction is not changed by atropine (1 microM) or suramin (300 microM). The exposure of urinary bladders to allyl isothiocyanate (100 microM) causes an increase in the prostaglandin E(2) and substance P levels. Taken together, these results indicate that TRPA1 agonists contract rat urinary bladder through sensory fibre stimulation, depending on extracellular Ca(2+) influx and release of tachykinins and cyclooxygenase metabolites, probably prostaglandin E(2). Thus, TRPA1 appears to exert an important role in urinary bladder function. SN - 0006-2952 UR - https://www.unboundmedicine.com/medline/citation/16725114/Contractile_mechanisms_coupled_to_TRPA1_receptor_activation_in_rat_urinary_bladder_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0006-2952(06)00218-8 DB - PRIME DP - Unbound Medicine ER -