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The role of ERK signaling and the P2X receptor on mechanical pain evoked by movement of inflamed knee joint.
Pain. 2006 Jul; 123(1-2):193-203.PAIN

Abstract

Pain during inflammatory joint diseases is enhanced by the generation of hypersensitivity in nociceptive neurons in the peripheral nervous system. To explore the signaling mechanisms of mechanical hypersensitivity during joint inflammation, experimental arthritis was induced by injection of complete Freund's adjuvant (CFA) into the synovial cavity of rat knee joints. As a pain index, the struggle threshold of the knee extension angle was measured. In rats with arthritis, the phosphorylation of extracellular signal-regulated kinase (ERK), induced by passive joint movement, increased significantly in dorsal root ganglion (DRG) neurons innervating the knee joint compared to the naïve rats that received the same movement. The intrathecal injection of a MEK inhibitor, U0126, reduced the phosphorylation of ERK in DRG neurons and alleviated the struggle behavior elicited by the passive movement of the joint. In addition, the injection of U0126 into the joint also reduced the struggle behavior. These findings indicate that the ERK signaling is activated in both cell bodies in DRG neurons and peripheral nerve fibers and may be involved in the mechanical sensitivity of the inflamed joint. Furthermore, the phosphorylated ERK-positive neurons co-expressed the P2X3 receptor, and the injection of TNP-ATP, which antagonizes P2X receptors, into the inflamed joint reduced the phosphorylated ERK and the struggle behavior. Thus, it is suggested that the activation of the P2X3 receptor is involved in the phosphorylation of ERK in DRG neurons and the mechanical hypersensitivity of the inflamed knee joint.

Authors+Show Affiliations

Department of Anatomy and Neuroscience, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya 663-8501, Japan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

16616417

Citation

Seino, Daisuke, et al. "The Role of ERK Signaling and the P2X Receptor On Mechanical Pain Evoked By Movement of Inflamed Knee Joint." Pain, vol. 123, no. 1-2, 2006, pp. 193-203.
Seino D, Tokunaga A, Tachibana T, et al. The role of ERK signaling and the P2X receptor on mechanical pain evoked by movement of inflamed knee joint. Pain. 2006;123(1-2):193-203.
Seino, D., Tokunaga, A., Tachibana, T., Yoshiya, S., Dai, Y., Obata, K., Yamanaka, H., Kobayashi, K., & Noguchi, K. (2006). The role of ERK signaling and the P2X receptor on mechanical pain evoked by movement of inflamed knee joint. Pain, 123(1-2), 193-203.
Seino D, et al. The Role of ERK Signaling and the P2X Receptor On Mechanical Pain Evoked By Movement of Inflamed Knee Joint. Pain. 2006;123(1-2):193-203. PubMed PMID: 16616417.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role of ERK signaling and the P2X receptor on mechanical pain evoked by movement of inflamed knee joint. AU - Seino,Daisuke, AU - Tokunaga,Atsushi, AU - Tachibana,Toshiya, AU - Yoshiya,Shinichi, AU - Dai,Yi, AU - Obata,Koichi, AU - Yamanaka,Hiroki, AU - Kobayashi,Kimiko, AU - Noguchi,Koichi, Y1 - 2006/04/17/ PY - 2005/07/20/received PY - 2006/02/14/revised PY - 2006/02/27/accepted PY - 2006/4/18/pubmed PY - 2006/8/10/medline PY - 2006/4/18/entrez SP - 193 EP - 203 JF - Pain JO - Pain VL - 123 IS - 1-2 N2 - Pain during inflammatory joint diseases is enhanced by the generation of hypersensitivity in nociceptive neurons in the peripheral nervous system. To explore the signaling mechanisms of mechanical hypersensitivity during joint inflammation, experimental arthritis was induced by injection of complete Freund's adjuvant (CFA) into the synovial cavity of rat knee joints. As a pain index, the struggle threshold of the knee extension angle was measured. In rats with arthritis, the phosphorylation of extracellular signal-regulated kinase (ERK), induced by passive joint movement, increased significantly in dorsal root ganglion (DRG) neurons innervating the knee joint compared to the naïve rats that received the same movement. The intrathecal injection of a MEK inhibitor, U0126, reduced the phosphorylation of ERK in DRG neurons and alleviated the struggle behavior elicited by the passive movement of the joint. In addition, the injection of U0126 into the joint also reduced the struggle behavior. These findings indicate that the ERK signaling is activated in both cell bodies in DRG neurons and peripheral nerve fibers and may be involved in the mechanical sensitivity of the inflamed joint. Furthermore, the phosphorylated ERK-positive neurons co-expressed the P2X3 receptor, and the injection of TNP-ATP, which antagonizes P2X receptors, into the inflamed joint reduced the phosphorylated ERK and the struggle behavior. Thus, it is suggested that the activation of the P2X3 receptor is involved in the phosphorylation of ERK in DRG neurons and the mechanical hypersensitivity of the inflamed knee joint. SN - 1872-6623 UR - https://www.unboundmedicine.com/medline/citation/16616417/The_role_of_ERK_signaling_and_the_P2X_receptor_on_mechanical_pain_evoked_by_movement_of_inflamed_knee_joint_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3959(06)00141-2 DB - PRIME DP - Unbound Medicine ER -