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Activation Of Peroxisome Proliferator-Activated Receptor G In Brain Inhibits Inflammatory Pain, Dorsal Horn Expression Of Fos, And Local Edema, Jenny Morgenweck, Omar D. Abdel-Aleem, Katelyn C. Mcnamara, Renee R. Donahue, M Z. Badr, Bradley K. Taylor

Renee R. Donahue

Systemic administration of thiazolidinediones reduces peripheral inflammation in vivo, presumablybyacting at peroxisome proliferator-activated receptor g (PPARg) in peripheral tissues. Based on a rapidly growing body of literature indicating the CNS as a functional target of PPARg actions, we postulated that brain PPARg modulates peripheral edema and the processing of inflammatory pain signals in the dorsal horn of the spinal cord. To test this in the plantar carrageenan model of inflammatory pain, we measured paw edema, heat hyperalgesia, and dorsal horn expression of the immediate-early gene c-fos after intracerebroventricular (ICV) administration of PPARg ligands or vehicle. We found that ICV rosiglitazone …