Prostaglandin Receptor Subtypes, EP3C and EP4, Mediate the Prostaglandin E2-induced cAMP Production and Sensitization of Sensory Neurons

M. D. Southall, M. R. Vasko

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Abstract

Although a number of prostaglandin E2 (PGE2) receptor subtypes have been cloned, limited studies have been performed to elucidate subtypes that subserve specific actions of this eicosanoid, in part because of a paucity of selective receptor antagonists. Using reverse transcription-polymerase chain reaction (PCR) and antisense oligonucleotides, we examined which prostaglandin E2 receptor (EP receptor) subtypes are expressed in sensory neurons and which mediate the PGE2-induced increase in cAMP production and augmentation of peptide release. Reverse transcription-PCR of cDNA isolated from rat sensory neurons grown in culture revealed PCR products for the EP1, EP2, EP3C, and EP4 receptor subtypes but not the EP3A of EP3B. Preexposing neuronal cultures for 48 h to antisense oligonucleotides of EP3C and EP4 mRNA diminished expression of the respective receptors by ∼80%, abolished the PGE2-stimulated production of cAMP, and blocked the ability of PGE2 to augment release of immunoreactive substance P and calcitonin gene-related peptide. Pretreating with individual antisense against the EP2, EP3C, or EP4 receptors or combinations of missense oligonucleotides had no effect on PGE2-induced activity. Treatment with antisense to EP3C and EP4 receptor subtypes did not alter the ability of forskolin to increase cAMP or enhance peptide release. These results demonstrate that sensory neurons are capable of expressing multiple EP receptor subtypes but that only the EP3C and EP4 receptors mediate PGE 2-induced sensitization of sensory neurons.

Original languageEnglish (US)
Pages (from-to)16083-16091
Number of pages9
JournalJournal of Biological Chemistry
Volume276
Issue number19
DOIs
StatePublished - May 11 2001

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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