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  • Pain-like behavior in the c...
    Su, Jie; Krock, Emerson; Barde, Swapnali; Delaney, Ada; Ribeiro, Johnny; Kato, Jungo; Agalave, Nilesh; Wigerblad, Gustaf; Matteo, Rosalia; Sabbadini, Roger; Josephson, Anna; Chun, Jerold; Kultima, Kim; Peyruchaud, Olivier; Hökfelt, Tomas; Svensson, Camilla I.

    Brain, behavior, and immunity, 03/2022, Letnik: 101
    Journal Article

    •LPA signalling inhibition reverses CAIA-induced pain-like behavior.•Autotaxin expression is locally upregulated in DRG neurons.•Satellite glia cells express LPA1 in humans and mice.•LPA stimulates satellite glia cells in vivo and in vitro. Inflammatory and neuropathic-like components underlie rheumatoid arthritis (RA)-associated pain, and lysophosphatidic acid (LPA) is linked to both joint inflammation in RA patients and to neuropathic pain. Thus, we investigated a role for LPA signalling using the collagen antibody-induced arthritis (CAIA) model. Pain-like behavior during the inflammatory phase and the late, neuropathic-like phase of CAIA was reversed by a neutralizing antibody generated against LPA and by an LPA1/3 receptor inhibitor, but joint inflammation was not affected. Autotaxin, an LPA synthesizing enzyme was upregulated in dorsal root ganglia (DRG) neurons during both CAIA phases, but not in joints or spinal cord. Late-phase pronociceptive neurochemical changes in the DRG were blocked in Lpar1 receptor deficient mice and reversed by LPA neutralization. In vitro and in vivo studies indicated that LPA regulates pain-like behavior via the LPA1 receptor on satellite glia cells (SGCs), which is expressed by both human and mouse SGCs in the DRG. Furthermore, CAIA-induced SGC activity is reversed by phospholipid neutralization and blocked in Lpar1 deficient mice. Our findings suggest that the regulation of CAIA-induced pain-like behavior by LPA signalling is a peripheral event, associated with the DRGs and involving increased pronociceptive activity of SGCs, which in turn act on sensory neurons.