title: Temporal distribution of p300/CBP immunoreactivity in the adult rat spinal dorsal horn following chronic constriction injury (CCI).
abstract: p300 and its homolog cyclic AMP response element binding protein (CBP) are coactivators that were identified to participate in many biological processes including neural development and cognition. Their roles within the rodent spinal cord have not been reported systematically; in this study, their spatiotemporal distribution in the spinal cord of adult rat following chronic constriction injury (CCI) was studied. p300 and CBP expressed predominantly in nuclei in the gray matter of rat spinal cord. Rats undergoing CCI surgery showed increased p300/CBP immunoreactivity (IR) compared with normal control and sham-operated rats. The number of IR cells reached the peak at day 14 following CCI compared with those on day 3, 7, and 21, accompanied with significant behavioral changes of neuropathic pain. Cell-type determination by immunofluorescence at day 14 following CCI revealed that p300 and CBP expressed in neurons, but not in astrocytes or microglial cells. These results suggest that p300 and CBP are probably involved in the maintenance of neuropathic pain on spinal cord level. Furthermore, p300 and CBP may serve as a sensor only in neurons but not in astrocytes or microglia cells in the adult rat spinal cord.
authors.affiliation: Department of Anesthesiology, Xiangya Hospital of Central South University, Changsha, Hunan, China.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Zhu
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Huang
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Qu-Lian
authors.initials: QL
authors.lastname: Guo
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: He
authors.forename: Juan
authors.initials: J
authors.lastname: Liao
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001522:Behavior, Animal; D003250:Constriction; D050881:E1A-Associated p300 Protein / Q000378:metabolism*; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism*; D009437:Neuralgia / Q000378:metabolism / Q000473:pathology; D010750:Phosphoproteins / Q000378:metabolism*; D020671:Posterior Horn Cells / Q000378:metabolism* / Q000473:pathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D011930:Reaction Time; D013997:Time Factors
chemical_list: D008565:Membrane Proteins; C408142:Pag1 protein, rat; D010750:Phosphoproteins; D050881:E1A-Associated p300 Protein; C494362:Ep300 protein, rat