title: Protective effects of BMP-7 against tumor necrosis factor α-induced oligodendrocyte apoptosis.
abstract: Bone morphogenic protein-7 (BMP7) is a multifunctional cytokine with demonstrated neurogenic potential. Oligodendrocytes (OLs) death after spinal cord injury (SCI) contributes to demyelination of spared axons, even leading to a permanent neurological deficit. Therefore, therapeutic approaches to prevent OLs death after SCI should be considered. Since the effects of BMP7 on OLs after injury are largely unknown, we demonstrated the effects of BMP7 on TNF-α-induced OLs apoptosis in vitro. The effects of BMP7 on TNF-α-induced OLs apoptosis were verified by flow cytometry, spectrophotometry and western blotting on primary cultures from spinal cord of postnatal day 1 (P1) to P2 rats. As shown by flow cytometry, apoptosis rate was 25.6% for the control group, 59.0% for the TNF-α group, and 33.5% for the BMP7+TNF-α group; spectrophotometry showed caspase-3 and caspase-8 activity were significantly increased in the TNF-α group than in the control group, and BMP7 could reverse the increase. The involvement of cIAP1 in the protection of BMP7 was determined by western blotting and silencing cIAP1. In summary, our results demonstrated that BMP7 could potently inhibite TNF-α-induced OLs apoptosis and identified the cIAP1 expression level, the activity of caspase-3 and caspase-8 as important mediators of OLs survival after cellular stress and cytokine challenge.
authors.affiliation: Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Anesthesia Research Institute, Central South University, Changsha, Hunan, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Anesthesia Research Institute, Central South University, Changsha, Hunan, China.
authors.forename: Jun-Mei
authors.initials: JM
authors.lastname: Xu
authors.affiliation: Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Anesthesia Research Institute, Central South University, Changsha, Hunan, China. Electronic address: wangyaping6568@126.com.
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Wang
authors.affiliation: Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Anesthesia Research Institute, Central South University, Changsha, Hunan, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Yang
authors.affiliation: Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Anesthesia Research Institute, Central South University, Changsha, Hunan, China.
authors.forename: Zhi-Jian
authors.initials: ZJ
authors.lastname: Li
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D017209:Apoptosis / Q000187:drug effects*; D055419:Bone Morphogenetic Protein 7 / Q000494:pharmacology*; D020169:Caspases / Q000378:metabolism; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D005260:Female; D005434:Flow Cytometry; D005732:Gangliosides / Q000378:metabolism; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D051034:Inhibitor of Apoptosis Proteins / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000187:drug effects; D008297:Male; D004676:Myelin Basic Protein / Q000378:metabolism; D009836:Oligodendroglia / Q000187:drug effects*; D034741:RNA, Small Interfering / Q000494:pharmacology; D051381:Rats; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000633:toxicity*
chemical_list: D055419:Bone Morphogenetic Protein 7; D005732:Gangliosides; D005904:Glial Fibrillary Acidic Protein; D051034:Inhibitor of Apoptosis Proteins; D004676:Myelin Basic Protein; D034741:RNA, Small Interfering; D014409:Tumor Necrosis Factor-alpha; C062875:ganglioside A2B5; D020169:Caspases
keywords: Apoptosis; BMP7; Oligodendrocyte; Spinal cord injury; TNF-α