We investigated the role of interferon regulatory factor 8 (IRF8) in a model of chronic pain in which repeated cold stress (RCS) exposure produces tactile allodynia. RCS exposure produced a decrease in paw withdrawal threshold (PWT) to mechanical stimulation. Spinal microglia of RCS-exposed mice were morphologically activated. Expression of IRF8 was significantly increased in the spinal cord of RCS-exposed mice and was localized in microglia. IRF8-knockout mice failed to show the RCS-induced decrease in PWT. Thus, RCS exposure activates spinal microglia and upregulation of IRF8 in these cells is involved in the development of tactile allodynia after RCS exposure.
All Science Journal Classification (ASJC) codes
- Molecular Medicine