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Guan X.-H.,Jiangsu Institute of Anesthesiology | Lu X.-F.,Jiangsu Institute of Anesthesiology | Zhang H.-X.,Jiangsu Institute of Anesthesiology | Wu J.-R.,Jiangsu Institute of Anesthesiology | And 5 more authors.
Pharmacology Biochemistry and Behavior | Year: 2010

EphBs receptors and their ephrinBs ligands are present in the adult brain and peripheral tissue and play a critical role in modulating multiple aspects of physiology and pathophysiology. Our recent evidence has shown that ephrinBs acted as a sensitizer to participate in peripheral sensitization and hyperalgesia induced by activation of peripheral ephrinBs/EphBs signaling. In the present study, we explored the role of phosphatidylinositol 3-kinase (PI3K) in ephrinB1-Fc-induced pain behaviors. Intraplantar injection of ephrinB1-Fc produced a time- and dose-dependent increase of PI3K-p110γ expression and of phosphorylation of AKT in skin of injection site. Pre-treatment with PI3K inhibitor wortmannin or LY294002 prevented activation of peripheral AKT by ephrinB1-Fc. The activated AKT expressed in peripheral nerve terminals and DRG peptide-containing and small non-peptide-containing neurons. Inhibition of peripheral PI3K signaling dose-dependently prevented and reversed pain behaviors and spinal Fos protein expression induced by intraplantar injection of ephrinB1-Fc. Furthermore, pre-treatment with PI3K inhibitor wortmannin or LY294002 prevented ephrinB1-Fc-induced ERK activation in a dose-dependent manner. These data demonstrated that PI3K and PI3K crosstalk to ERK signaling mediated pain behaviors induced by activation of peripheral ephrinBs/EphBs signaling in mice. © 2010 Elsevier Inc.

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