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Molecular Pharmacology

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Epigenetic Modulation of mGlu2 Receptors by Histone Deacetylase Inhibitors in the Treatment of Inflammatory Pain

S. Chiechio, M. Zammataro, M. E. Morales, C. L. Busceti, F. Drago, R. W. Gereau IV, A. Copani and F. Nicoletti
Molecular Pharmacology May 2009, 75 (5) 1014-1020; DOI: https://doi.org/10.1124/mol.108.054346
S. Chiechio
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M. Zammataro
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M. E. Morales
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C. L. Busceti
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F. Drago
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R. W. Gereau IV
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A. Copani
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F. Nicoletti
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Abstract

Knowing that expression of metabotropic glutamate 2 (mGlu2) receptors in the dorsal root ganglia is regulated by acetylation mechanisms, we examined the effect of two selective and chemically unrelated histone deacetylase (HDAC) inhibitors, N-(2-aminophenyl)-4-[N-(pyridine-3-ylmethoxy-carbonyl)aminomethyl]benzamide (MS-275) and suberoylanilide hydroamic acid (SAHA), in a mouse model of persistent inflammatory pain. Although a single subcutaneous injection of MS-275 (3 mg/kg) or SAHA (5-50 mg/kg) was ineffective, a 5-day treatment with either of the two HDAC inhibitors substantially reduced the nociceptive response in the second phase of the formalin test, which reflects the development of central sensitization in the dorsal horn of the spinal cord. Analgesia was abrogated by a single injection of the mGlu2/3 receptor antagonist (αS)-α-amino-α-[(1S,2S)-2-carboxycyclopropyl]-9H-xantine-9-propanoic acid (LY341495; 1 mg/kg, i.p.), which was inactive per se. Both MS-275 and SAHA up-regulated the expression of mGlu2 receptors in the dorsal root ganglion (DRG) and spinal cord under conditions in which they caused analgesia, without changing the expression of mGlu1a, mGlu4, or mGlu5 receptors. Induction of DRG mGlu2 receptors in response to SAHA was associated with increased acetylation of p65/RelA on lysine 310, a process that enhances the transcriptional activity of p65/RelA at nuclear factor-κB-regulated genes. Transcription of the mGlu2 receptor gene is known to be activated by p65/RelA in DRG neurons. We conclude that HDAC inhibition produces analgesia by up-regulating mGlu2 receptor expression in the DRG, an effect that results from the amplification of NF-κB transcriptional activity. These data provide the first evidence that HDAC inhibitors cause analgesia and suggest that HDACs are potential targets for the epigenetic treatment of pain.

Footnotes

  • ABBREVIATIONS: mGlu, metabotropic glutamate; HDAC, histone deacetylase; LY 379268, (1R,4R,5S,6R)-4-amino-2-oxabicyclo[3.1.0]hexane-4,6-dicarboxylic acid; LY 341495, (αS)-α-amino-α-[(1S,2S)-2-carboxycyclopropyl]-9H-xantine-9-propanoic acid; SAHA, suberoylanilide hydroamic acid; MS-275 3-pyridylmethyl-N-{4-[(2-aminophenyl)-carbamoyl]-benzyl-carbamate.

    • Received December 19, 2008.
    • Accepted March 2, 2009.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 75 (5)
Molecular Pharmacology
Vol. 75, Issue 5
1 May 2009
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Epigenetic Modulation of mGlu2 Receptors by Histone Deacetylase Inhibitors in the Treatment of Inflammatory Pain

S. Chiechio, M. Zammataro, M. E. Morales, C. L. Busceti, F. Drago, R. W. Gereau, A. Copani and F. Nicoletti
Molecular Pharmacology May 1, 2009, 75 (5) 1014-1020; DOI: https://doi.org/10.1124/mol.108.054346

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Epigenetic Modulation of mGlu2 Receptors by Histone Deacetylase Inhibitors in the Treatment of Inflammatory Pain

S. Chiechio, M. Zammataro, M. E. Morales, C. L. Busceti, F. Drago, R. W. Gereau, A. Copani and F. Nicoletti
Molecular Pharmacology May 1, 2009, 75 (5) 1014-1020; DOI: https://doi.org/10.1124/mol.108.054346
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