Enhancing KCC2 function counteracts morphine-induced hyperalgesia View Full Text


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Article Info

DATE

2017-06-20

AUTHORS

Francesco Ferrini, Louis-Etienne Lorenzo, Antoine G. Godin, Miorie Le Quang, Yves De Koninck

ABSTRACT

Morphine-induced hyperalgesia (MIH) is a severe adverse effect accompanying repeated morphine treatment, causing a paradoxical decrease in nociceptive threshold. Previous reports associated MIH with a decreased expression of the Cl- extruder KCC2 in the superficial dorsal horn (SDH) of the spinal cord, weakening spinal GABAA/glycine-mediated postsynaptic inhibition. Here, we tested whether the administration of small molecules enhancing KCC2, CLP257 and its pro-drug CLP290, may counteract MIH. MIH was typically expressed within 6-8 days of morphine treatment. Morphine-treated rats exhibited decreased withdrawal threshold to mechanical stimulation and increased vocalizing behavior to subcutaneous injections. Chloride extrusion was impaired in SDH neurons measured as a depolarizing shift in E GABA under Cl- load. Delivering CLP257 to spinal cord slices obtained from morphine-treated rats was sufficient to restore Cl- extrusion capacity in SDH neurons. In vivo co-treatment with morphine and oral CLP290 prevented membrane KCC2 downregulation in SDH neurons. Concurrently, co-treatment with CLP290 significantly mitigated MIH and acute administration of CLP257 in established MIH restored normal nociceptive behavior. Our data indicate that enhancing KCC2 activity is a viable therapeutic approach for counteracting MIH. Chloride extrusion enhancers may represent an effective co-adjuvant therapy to improve morphine analgesia by preventing and reversing MIH. More... »

PAGES

3870

References to SciGraph publications

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    http://scigraph.springernature.com/pub.10.1038/s41598-017-04209-3

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28634406


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