Synergistic antinociceptive effects of N-methyl-D-aspartate receptor antagonist and electroacupuncture in the complete Freund's adjuvant-induced pain model

  • Authors:
    • Ji-Υeon Jang
    • Ha-Νeui Kim
    • Sung-Τae Koo
    • Hwa-Κyoung Shin
    • Eun-Sang Choe
    • Byung-Tae Choi
  • View Affiliations

  • Published online on: June 17, 2011     https://doi.org/10.3892/ijmm.2011.728
  • Pages: 669-675
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Abstract

This study examined the synergistic antinociceptive effects associated with signaling pathway proteins of the spinal cord in a complete Freund's adjuvant (CFA)-induced pain model when electroacupuncture (EA) and a N-methyl-D-aspartate receptor (NMDAR) antagonist were administered in combination. EA stimulation (2 Hz, 1 mA) was needle-delivered for 20 min once daily at acupoints corresponding to Zusanli and Sanyinjiao with intrathecal injection of the NMDAR antagonist dizocilpine (MK801). Thermal sensitivity of the hindpaw induced by CFA was strongly inhibited by dizocilpine injection and EA stimulation. Co-treatment with EA and dizocilpine showed a synergistic antinociceptive effect against inflammatory pain. On day two of the experiment, we examined the phosphorylation of the NMDAR NR2B subunit, of the extracellular signal-regulated kinase (ERK), p38 and of the cAMP response element-binding protein (CREB) in the ipsilateral dorsal horn of L4-5 segments by Western blot analysis. Phosphorylation of the NMDAR NR2B subunit induced by CFA was markedly inhibited by co-treatment with dizocilpine and EA, but not by dizocilpine or EA treatment alone. CFA-induced phosphorylation of the ERK was inhibited by both dizocilpine and EA, but that of p38 was inhibited by EA only. CFA-induced phosphorylation of CREB was inhibited by dizocilpine, but did not show marked changes. Immunohistochemical analyses confirmed that there was a significant difference in the NMDAR NR2B subunit and ERK phosphorylation. It is possible that the combined treatment with EA and the NMDAR antagonist dizocilpine resulted in synergistic antinociceptive effects in an inflammatory pain model via the inactivation of both the NMDAR NR2B subunit and ERK of the spinal cord.

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October 2011
Volume 28 Issue 4

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Jang J, Kim H, Koo S, Shin H, Choe E and Choi B: Synergistic antinociceptive effects of N-methyl-D-aspartate receptor antagonist and electroacupuncture in the complete Freund's adjuvant-induced pain model. Int J Mol Med 28: 669-675, 2011
APA
Jang, J., Kim, H., Koo, S., Shin, H., Choe, E., & Choi, B. (2011). Synergistic antinociceptive effects of N-methyl-D-aspartate receptor antagonist and electroacupuncture in the complete Freund's adjuvant-induced pain model. International Journal of Molecular Medicine, 28, 669-675. https://doi.org/10.3892/ijmm.2011.728
MLA
Jang, J., Kim, H., Koo, S., Shin, H., Choe, E., Choi, B."Synergistic antinociceptive effects of N-methyl-D-aspartate receptor antagonist and electroacupuncture in the complete Freund's adjuvant-induced pain model". International Journal of Molecular Medicine 28.4 (2011): 669-675.
Chicago
Jang, J., Kim, H., Koo, S., Shin, H., Choe, E., Choi, B."Synergistic antinociceptive effects of N-methyl-D-aspartate receptor antagonist and electroacupuncture in the complete Freund's adjuvant-induced pain model". International Journal of Molecular Medicine 28, no. 4 (2011): 669-675. https://doi.org/10.3892/ijmm.2011.728