Ryan J Horvath et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 29(4), 998-1005 (2009-01-30)
Opioids, although fundamental to the treatment of pain, are limited in efficacy by side effects including tolerance and hyperalgesia. Using an in vitro culture system, we report that morphine increased microglial migration via a novel interaction between mu-opioid and P2X(4)