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BACKGROUND:Studies have demonstrated that experimental autoimmune encephalomyelitis(EAE) onset correlates with increased interferon-γ(IFN-γ) and tumor necrosis factor-α(TNF-α) expression.Oxymatrine(OM) has been shown to inhibit autoimmune responses,but there are no reports showing that it could prevent the development of EAE.OBJECTIVE:To observe the effect of OM on serum levels of IFN-γ and TNF-α in a rat model of EAE.DESIGN,TIME AND SETTING:A randomized,controlled,animal study was performed at the Experimental Animal Center of Henan Academy of Chinese Medicine and at the Key Disciplines Laboratory Clinical Medicine of Henan Province between July and December 2008.MATERIALS:OM was purchased from Chia-tai Tianqing Pharmaceutical,China;complete Freund’s adjuvant was purchased from Sigma,USA.METHODS:Forty female Wistar rats were randomly assigned to four groups:EAE model(M),low-dose OM treatment(OM-L),high-dose OM treatment(OM-H),and normal control(N,no immunization),with 10 rats in each group.EAE was established in the M,OM-L,and OM-H groups following immunization with Guinea pig spinal cord homogenate and complete Freund’s adjuvant.The M and N groups were intraperitoneally injected with normal saline(6.7 mL/kg per day),the OM-L group received an intraperitoneal injection of OM(100 mg/kg per day),and the OM-H group received OM(150 mg/kg per day).MAIN OUTCOME MEASURES:At 16 days after immunization,the degree of histopathological changes in the spinal cord was assessed by hematoxylin-eosin stanining.Enzyme-linked immunosorbent assay was used to detect serum levels of IFN-γ,and radioimmunoassay was utilized to determine serum TNF-α level.Neurological scores were measured on a daily basis according to a 0-5 scale.RESULTS:Daily injections of OM,both high and low doses,resulted in decreased neurological scores in EAE rats(P < 0.01),as well as reduced cellular infiltration in the spinal cord and decreased levels of serum IFN-γ and TNF-α(P < 0.01).CONCLUSION:OM reduced the onset and severity of EAE,which correlated with decreased IFN-γ and TNF-α expression.
BACKGROUND: Studies have demonstrated that experimental autoimmune encephalomyelitis (EAE) onset correlates with increased interferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) expression. Oxymatrine (OM) has been shown to inhibit autoimmune responses, but there are no reports showing that it could prevent the development of EAE.OBJECTIVE: To observe the effect of OM on serum levels of IFN-γ and TNF-α in a rat model of EAE. DESIGN, TIME AND SETTING: A randomized, controlled , animal study was performed at the Experimental Animal Center of Henan Academy of Chinese Medicine and at the Key Disciplines Laboratory Clinical Medicine of Henan Province between July and December 2008. SPECIALS: OM was purchased from Chia-tai Tianqing Pharmaceutical, China; complete Freund’s adjuvant was purchased from Sigma, USA.METHODS: Forty female Wistar rats were randomly assigned to four groups: EAE model (M), low-dose OM treatment (OM-L), high-dose OM treatment control (N, no immunization), with 10 rats in each group. EAE was established in the M, OM-L, and OM-H groups following immunization with Guinea pig spinal cord homogenate and complete Freund’s adjuvant. M and N groups were intraperitoneally injected with normal saline (6.7 mL / kg per day ), the OM-L group received an intraperitoneal injection of OM (100 mg / kg per day), and the OM-H group received OM (150 mg / kg per day) .MAIN OUTCOME MEASURES: At 16 days after immunization, the degree of histopathological changes in the spinal cord was assessed by hematoxylin-eosin stanining. Enzyme-linked immunosorbent assay was used to detect serum levels of IFN-γ, and radioimmunoassay was utilized to determine serum TNF-α level. Neurological scores were measured on a daily basis according to a 0-5 scale. RESULTS: Daily injections of OM, both high and low doses, resulted in decreased neurological scores in EAE rats (P <0.01), as well as reduced cellular infiltration in the spinal cord and decreased levels of serum IFN-γ and TNF-α (P <0.01) .CONCLUSION: OM redu ced the onset and severity of EAE, which correlated with decreased IFN-γ and TNF-α expression.