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Volume 14 Issue 12, December 2019

A non-opioid treatment option for chronic pain

An important signalling mechanism in chronic pain is mediated by the substance P (SP) neurokinin 1 receptor (NK1R), which is located in the acidic endosomes of sensory nervous cells, from which it generates signals that maintain the pain. NK1R antagonists have been developed, but have failed in clinical trials thus far. Ramírez-García et al. now exploit the intrinsic property of polymeric pH-responsive nanoparticles to be transported in endosomes within cells to directly deliver an FDA-approved NK1R antagonist to the acidic endosomes of spinal neurons. Upon intrathecal injection in rodents, the nanoparticles could efficiently prevent pain signal transmission, providing a potential alternative to opioids for chronic pain treatment. The cover art is an artistic impression of this nanoparticle-mediated prevention of chronic pain signal transmission in the spine.

Article by Bunnett et al.

IMAGE: Andrew Lilja and John McGhee, University of New South Wales. COVER DESIGN: Bethany Vukomanovic

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