Details

Autor(en) / Beteiligte

• Vincent, Kathleen
• Cornea, Virginia M.
• Jong, Yuh-Jiin I.
• Laferrière, André
• Kumar, Naresh
• Mickeviciute, Aiste
• Fung, Jollee S. T.
• Bandegi, Pouya
• Ribeiro-da-Silva, Alfredo
• O’Malley, Karen L.
• Coderre, Terence J.

Titel

Intracellular mGluR5 plays a critical role in neuropathic pain

Ist Teil von

• Nature communications, 2016-02, Vol.7 (1), p.10604-10604, Article 10604

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• Spinal mGluR5 is a key mediator of neuroplasticity underlying persistent pain. Although brain mGluR5 is localized on cell surface and intracellular membranes, neither the presence nor physiological role of spinal intracellular mGluR5 is established. Here we show that in spinal dorsal horn neurons >80% of mGluR5 is intracellular, of which ∼60% is located on nuclear membranes, where activation leads to sustained Ca 2+ responses. Nerve injury inducing nociceptive hypersensitivity also increases the expression of nuclear mGluR5 and receptor-mediated phosphorylated-ERK1/2, Arc/Arg3.1 and c- fos . Spinal blockade of intracellular mGluR5 reduces neuropathic pain behaviours and signalling molecules, whereas blockade of cell-surface mGluR5 has little effect. Decreasing intracellular glutamate via blocking EAAT-3, mimics the effects of intracellular mGluR5 antagonism. These findings show a direct link between an intracellular GPCR and behavioural expression in vivo . Blockade of intracellular mGluR5 represents a new strategy for the development of effective therapies for persistent pain. mGluR5 has been shown to play a role in chronic pain regulation. Here, the authors use membrane permeable and non-transported, impermeable mGluR5 antagonists to show that spinal analgesic effects in vivo are mediated by intracellular rather than cell surface mGluR5.