Sphingosine 1-phosphate receptor 2 antagonist JTE-013 increases the excitability of sensory neurons independently of the receptor

Chao Li, Xian Xuan Chi, Wenrui Xie, J. A. Strong, J. M. Zhang, Grant Nicol

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Previously we demonstrated that sphingosine 1-phosphate receptor 1 (S1PR1) played a prominent, but not exclusive, role in enhancing the excitability of small-diameter sensory neurons, suggesting that other S1PRs can modulate neuronal excitability. To examine the potential role of S1PR2 in regulating neuronal excitability we used the established selective antagonist of S1PR2, JTE-013. Here we report that exposure to JTE-013 alone produced a significant increase in excitability in a time- and concentrationdependent manner in 70-80% of recorded neurons. Internal perfusion of sensory neurons with guanosine 5′-O-(2-thiodiphosphate) (GDP- β-S) via the recording pipette inhibited the sensitization produced by JTE-013 as well as prostaglandin E2. Pretreatment with pertussis toxin or the selective S1PR1 antagonist W146 blocked the sensitization produced by JTE-013. These results indicate that JTE-013 might act as an agonist at other G protein-coupled receptors. In neurons that were sensitized by JTE-013, single-cell RT-PCR studies demonstrated that these neurons did not express the mRNA for S1PR2. In behavioral studies, injection of JTE-013 into the rat's hindpaw produced a significant increase in the mechanical sensitivity in the ipsilateral, but not contralateral, paw. Injection of JTE-013 did not affect the withdrawal latency to thermal stimulation. Thus JTE-013 augments neuronal excitability independently of S1PR2 by unknown mechanisms that may involve activation of other G protein-coupled receptors such as S1PR1. Clearly, further studies are warranted to establish the causal nature of this increased sensitivity, and future studies of neuronal function using JTE-013 should be interpreted with caution.

Original languageEnglish
Pages (from-to)1473-1483
Number of pages11
JournalJournal of Neurophysiology
Volume108
Issue number5
DOIs
StatePublished - Sep 1 2012

Fingerprint

Lysosphingolipid Receptors
Sensory Receptor Cells
G-Protein-Coupled Receptors
Neurons
JTE 013
Injections
Pertussis Toxin
Dinoprostone
Perfusion
Hot Temperature

Keywords

  • Mechanical sensitivity
  • Sensitization

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)

Cite this

Sphingosine 1-phosphate receptor 2 antagonist JTE-013 increases the excitability of sensory neurons independently of the receptor. / Li, Chao; Chi, Xian Xuan; Xie, Wenrui; Strong, J. A.; Zhang, J. M.; Nicol, Grant.

In: Journal of Neurophysiology, Vol. 108, No. 5, 01.09.2012, p. 1473-1483.

Research output: Contribution to journalArticle

Li, Chao ; Chi, Xian Xuan ; Xie, Wenrui ; Strong, J. A. ; Zhang, J. M. ; Nicol, Grant. / Sphingosine 1-phosphate receptor 2 antagonist JTE-013 increases the excitability of sensory neurons independently of the receptor. In: Journal of Neurophysiology. 2012 ; Vol. 108, No. 5. pp. 1473-1483.
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