RT Journal Article
SR Electronic
T1 Role of Drp1, a Key Mitochondrial Fission Protein, in Neuropathic Pain
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 11404
OP 11410
DO 10.1523/JNEUROSCI.2223-11.2011
VO 31
IS 31
A1 Luiz F. Ferrari
A1 Adrienne Chum
A1 Oliver Bogen
A1 David B. Reichling
A1 Jon D. Levine
YR 2011
UL http://www.jneurosci.org/content/31/31/11404.abstract
AB While oxidative stress has been implicated in small-fiber painful peripheral neuropathies, antioxidants are only partially effective to treat patients. We have tested the hypothesis that Drp1 (dynamin-related protein 1), a GTPase that catalyzes the process of mitochondrial fission, which is a mechanism central for the effect and production of reactive oxygen species (ROS), plays a central role in these neuropathic pain syndromes. Intrathecal administration of oligodeoxynucleotide antisense against Drp1 produced a decrease in its expression in peripheral nerve and markedly attenuated neuropathic mechanical hyperalgesia caused by HIV/AIDS antiretroviral [ddC (2′,3′-dideoxycytidine)] and anticancer (oxaliplatin) chemotherapy in male Sprague Dawley rats. To confirm the role of Drp1 in these models of neuropathic pain, as well as to demonstrate its contribution at the site of sensory transduction, we injected a highly selective Drp1 inhibitor, mdivi-1, at the site of nociceptive testing on the dorsum of the rat's hindpaw. mdivi-1 attenuated both forms of neuropathic pain. To evaluate the role of Drp1 in hyperalgesia induced by ROS, we demonstrated that intradermal hydrogen peroxide produced dose-dependent hyperalgesia that was inhibited by mdivi-1. Finally, mechanical hyperalgesia induced by diverse pronociceptive mediators involved in inflammatory and neuropathic pain—tumor necrosis factor α, glial-derived neurotrophic factor, and nitric oxide—was also inhibited by mdivi-1. These studies provide support for a substantial role of mitochondrial fission in preclinical models of inflammatory and neuropathic pain.