期刊
JOURNAL OF CONTROLLED RELEASE
卷 110, 期 2, 页码 283-289出版社
ELSEVIER
DOI: 10.1016/j.jconrel.2005.10.022
关键词
lecithinized superoxide dismutase (PC-SOD); unmodified SOD (U-SOD); BBB (Basso Beattie Bresnahan) score; spinal cord injury (SCI)
PC-SOD (lecithinized superoxide dismutase) is a derivative of human Cu, Zn-SOD conjugated with 4 molecules of lecithin, yet having the enzyme activity of scavenging superoxide anion (O-2(-)). Intravenous administration of PC-SOD promoted the recovery from spinal cord injury (SCI)-induced motor dysfunction in a dose-dependent manner in rat model, when evaluated by BBB (Basso Beattie Bresnahan) score. Even when given at 24 h after SCI, PC-SOD (1 mg/kg) significantly improved motor dysfunction. Distribution study demonstrated that PC-SOD gradually accumulated to the injured site. Enzyme-linked immunoassay revealed that PC-SOD prevented quantitative loss of neurons, astrocytes, and oligodendrocytes. PC-SOD inhibited SCI-induced oxidative stress, such as the decrease of free sulfhydryl residue, acetylcholine esterase activity, and the increase of lipid peroxidation. PC-SOD increased the production of neuroprotective factors. HIF-1 alpha gene expression increased following SCI, and PC-SOD further increased it. In conclusion, PC-SOD gradually accumulated and retained at the damaged site to scavenge excessive O-2(-), and suppressed neuronal death through reducing oxidative stress, increasing neuroprotective factor production and HIF-1 alpha gene expression. (c) 2005 Elsevier B.V. All fights reserved.
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