Abstract：OBJECTIVE: To study the therapeutic efficacy of baicalin and its effect on apoptosis of inflammatory cells in spinal cords in Wistar rats with autoimmune encephalomyelitis (EAE). METHODS: Forty-four rats were randomly divided into four groups: normal control group (control, n=10), EAE group (n=12), and two intervention groups with dexamethasone (DXM) or baicalin. Seven days after immunization, the two intervention groups were injected intraperitoneally with DXM (1 mg/kg) and baicalin (200 mg/kg) for 1 week, respectively. The spinal cords were removed 14 days after immunization, and stained with hematoxylin and eosin. MBP expression in spinal cords was detected by immunohistochemistry. The apoptosis of inflammatory cells in spinal cords was detected by TUNEL. RESULTS: The weight gain rate in the untreated EAE and the DXM or baicalin intervention groups were significantly lower than that in the control group (P<0.05). The weight gain rate in the baicalin intervention group was significantly higher than that in the untreated EAE and the DXM intervention groups (P<0.05). The scores of neurological function in the two intervention groups were significantly higher than that in the untreated EAE group (P<0.05). DXM or baicalin treatment significantly increased the MBP expression compared with the untreated EAE group (P<0.05). The apoptosis of inflammatory cells increased more in the DXM and the baicalin intervention groups compared with the untreated EAE groups (P<0.05). CONCLUSIONS: Baicalin has protective effects against EAE in rats. It can promote the apoptosis of inflammatory cells in spinal cords.
［1］Bauer J , Wekerle H, Lassmann H. Apoptosis in brain-specific autoimmune disease［J］. Curr Opin Immunol, 1995, 7(6): 839-843.
［2］Nguyen KB, McCombe PA , Pender MP. Increase apoptosis of T lymphocytes and macrophages in the central and peripheral nervous systems of Lewis rats with experimental autoimmune encephalomyelitis treated with dexamethasone［J］. J Neuropathol Exp Neurol, 1997, 56(1): 58-69.
［3］Chao JI, Su WC, Liu HF. Baicalein induces cancer cell death and proliferation retardation by the inhibition of CDC2 kinase and survivin associated with opposite role of p38mitogen-activated protein kinase and AKT Mol［J］. Cancer Ther, 2007, 6(11): 3039-3048.
［5］Zhang XP, Tian H, Lai YH, Chen L, Zhang L, Cheng QH, et al. Protective effects and mechanisms of Baicalin and octreotide on renal injury of rats with severe acute pancreatitis［J］. World J Gastroenterol, 2007,13（38）：5079-5089.
［7］Maccioni M, Riera CM, Rivero VE. Peritoneal antigen-presenting cells pulsed in vivo with myelin basic protein induce the suppression of experimental autoimmune encephalomyelitis (EAE) in Wistar rats［J］. J Neuroimmunol, 1999, 96（1）:46-56.
［9］McCombe PA, Nickson I, Tabi Z, Pender MP. Corticosteroid treatment of experimental autoimmune encephalomyelitis in the Lewis rat results in loss of V beta 8.2+ and myelin basic protein-reactive cells from the spinal cord, with increased total T-cell apoptosis but reduced apoptosis of V beta 8.2+ cells［J］. J Neuroimmunol, 1996, 70(2): 93-101.
