Abstract:
AIMS:Emerging lines of evidence indicate that oxidants such as hydrogen peroxide exert specific signaling functions during the processing of chronic pain. However, the mechanisms by which oxidants regulate pain processing in vivo remain poorly understood. Here, we investigated whether cyclic guanosine monophosphate (cGMP)-dependent protein kinase Iα (cGKIα), which can be activated by oxidants independently of cGMP, serves as a primary redox target during pain processing. RESULTS:After peripheral nerve injury, oxidant-induced cGKIα activation is increased in dorsal root ganglia of mice. Knock-in (KI) mice in which cGKIα cannot transduce oxidant signals demonstrated reduced neuropathic pain behaviors after peripheral nerve injury, and reduced pain behaviors after intrathecal delivery of oxidants. In contrast, acute nociceptive, inflammatory, and cGMP-induced pain behaviors were not impaired in these mice. INNOVATION:Studying cGKIα KI mice, we provide the first evidence that oxidants activate cGKIα in sensory neurons after peripheral nerve injury in vivo. CONCLUSION:Our results suggest that oxidant-induced activation of cGKIα specifically contributes to neuropathic pain processing, and that prevention of cGKIα redox activation could be a potential novel strategy to manage neuropathic pain.
journal_name
Antioxid Redox Signaljournal_title
Antioxidants & redox signalingauthors
Lorenz JE,Kallenborn-Gerhardt W,Lu R,Syhr KM,Eaton P,Geisslinger G,Schmidtko Adoi
10.1089/ars.2013.5585subject
Has Abstractpub_date
2014-10-01 00:00:00pages
1504-15issue
10eissn
1523-0864issn
1557-7716journal_volume
21pub_type
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