title: Spatiotemporal profile and essential role of RBM3 expression after spinal cord injury in adult rats.
abstract: Hypoxia and other adverse conditions are usually encountered by rapidly growing cells. The RNA-binding motif protein 3 (RBM3) is induced by low temperature and hypoxia. However, its expression and function in spinal cord injury are still unclear. To investigate the certain expression and biological function in the central nervous system, we performed an acute spinal cord contusion injury (SCI) model in adult rats. Western blot analysis indicated a striking expression upregulation of RBM3 after spinal cord injury (SCI). Double immunofluorescence staining prompted that RBM3 immunoreactivity was found in astrocytes and neurons. Interestingly, RBM3 expression was increased predominantly in astrocytes. Furthermore, colocalization of RBM3 with proliferating cell nuclear antigen (PCNA) was detected in astrocytes. To further understand whether RBM3 plays a role in astrocyte proliferation, we applied lipopolysaccharide (LPS) to induce astrocyte proliferation in vitro. Western blot analysis demonstrated that RBM3 expression was positively correlated with PCNA expression following LPS stimulation. Immunofluorescence analysis showed that the expression of RBM3 was also changed following the stimulation of astrocytes with LPS, which was parallel with the data in vivo. Additionally, knocking RBM3 down with small interfering RNA (siRNA) demonstrated that RBM3 might play a significant role in the proliferation of astrocytes treated by hypoxia in vitro. These results suggest that RBM3 may be involved in the proliferation of astrocytes after SCI. To summarize, we firstly uncover the temporal and spatial expression changes of RBM3 in spinal cord injury. Our data suggest that RBM3 might be implicated in central nervous system pathophysiology after SCI.
authors.affiliation: Department of Spine Surgery, The Second Affiliated Hospital of Nantong University, Nantong University, 226001, Nantong, Jiangsu, People's Republic of China, cuizhiming2012@hotmail.com.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Cui
authors.forename: Jinlong
authors.initials: J
authors.lastname: Zhang
authors.forename: Guofeng
authors.initials: G
authors.lastname: Bao
authors.forename: Guanhua
authors.initials: G
authors.lastname: Xu
authors.forename: Yuyu
authors.initials: Y
authors.lastname: Sun
authors.forename: Lingling
authors.initials: L
authors.lastname: Wang
authors.forename: Jiajia
authors.initials: J
authors.lastname: Chen
authors.forename: Huricha
authors.initials: H
authors.lastname: Jin
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.forename: Longfei
authors.initials: L
authors.lastname: Yang
authors.forename: Guijuan
authors.initials: G
authors.lastname: Feng
authors.forename: Weidong
authors.initials: W
authors.lastname: Li
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000378:metabolism / Q000502:physiology; D015687:Cell Hypoxia; D049109:Cell Proliferation; D002478:Cells, Cultured; D008297:Male; D009474:Neurons / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000235:genetics / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013119:Spinal Cord Injuries / Q000378:metabolism*
chemical_list: D018809:Proliferating Cell Nuclear Antigen; C533319:RBM3 protein, rat; D016601:RNA-Binding Proteins