Modulation of purinergic neuromuscular transmission by phorbol dibutyrate is independent of protein kinase C in murine urinary bladder

T. J. Searl*, E. M. Silinsky

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Parasympathetic control of murine urinary bladder consists of contractile components mediated by both muscarinic and purinergic receptors. Using intracellular recording techniques, the purinergic component of transmission was measured as both evoked excitatory junctional potentials (EJPs) in response to electrical field stimulation and spontaneous events [spontaneous EJPs (sEJPs)]. EJPs, but not sEJPs, were abolished by the application of the Na+ channel blocker tetrodotoxin and the Ca2+channel blocker Cd2+. Both EJPs and sEJPs were abolished by the application of the P2X1 antagonist 8,8′-[carbonylbis(imino-4,1-phenylenecarbonylimino-4,1- phenylenecarbonylimino)]bis-1,3,5- naphthalenetrisulfonic acid hexasodium salt (NF279). Application of phorbol dibutyrate (PDBu) increased electrically evoked EJP amplitudes with no effect on mean sEJP amplitudes. Similar increases in EJP amplitudes were produced by PDBu in the presence of either the nonselective protein kinase inhibitor staurosporine or the specific protein kinase C (PKC) inhibitor 2-[1-(3-dimethylaminopropyl)indol-3-yl]-3-(indol-3-yl) maleimide (GF109203X). These results suggest that PDBu increases the purinergic component of detrusor transmission through increasing neurogenic ATP release via a PKC-independent mechanism.

Original languageEnglish (US)
Pages (from-to)312-317
Number of pages6
JournalJournal of Pharmacology and Experimental Therapeutics
Volume342
Issue number2
DOIs
StatePublished - Aug 1 2012

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ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology

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