硒化大蒜多糖对环磷酰胺所致免疫抑制鸡的颉颃作用

The Antagonistic Effect of Selenizing Garlic Polysaccharide on Immunosuppressed Chicken Induced by Cyclophosphamide

为探究硒化大蒜多糖对环磷酰胺所致免疫抑制的颉颃作用,将336只11日龄非免疫健康罗曼雏鸡随机均分为7组:空白对照组(BC)、免疫对照组(VC)、环磷酰胺对照组(Cy)、sGPS3、sGPS5、sGPS6和药物对照组(APS),每组6个重复,每个重复8只鸡。BC组和VC组注射0.5mL生理盐水,其余组均肌肉注射8mg/mL环磷酰胺0.5mL,每天1次,连续3d;14日龄时,除BC组外,其余组均用新城疫疫苗免疫,同时3个硒大蒜化多糖组分别注射0.5mL浓度为1mg/mL的sGPS3、sGPS5、sGPS6,APS组肌肉注射黄芪多糖注射液0.5mL,Cy组、VC组和BC组注射生理盐水0.5mL,每天1次,连续3d,28日龄二免。分别于首免后的第7、14、21、28天,每组随机抽取6只罗曼鸡翼静脉采血,分离血清,β-微量法检测血清ND-HI抗体效价、ELISA法检测血清γ干扰素(IFN-γ)和白细胞介素2(IL-2)含量。称量体重后采集胸腺、脾脏和法氏囊组织并称重,计算免疫器官指数。结果显示,各给药组的血清ND-HI抗体效价、血清IFN-γ和IL-2含量、法氏囊指数均显著高于Cy组(P<0.05);sGPS6组血清抗体效价、IFN-γ含量在28d,血清IL-2含量在21、28d均显著高于其余各组(P<0.05);在免疫后21、28d,4个给药组中sGPS6组体重、法氏囊指数最高,显著高于其余3个给药组(P<0.05);在免疫后28d,4个给药组中sGPS6组胸腺指数、脾脏指数最高,显著高于其余3个给药组(P<0.05)。结果表明,硒化大蒜多糖对环磷酰胺所致的免疫抑制具有颉颃作用,其中sGPS6组的活性最高,可作为新型免疫抑制颉颃剂的候选药。

In order to observe the antagonistic effect of selenizing garlic polysaccharide on immunosuppressed chicken induced by cyclophosphamide,336 11-day-old roman chickens were randomly divided into seven groups:Blank control group(BC),vaccine group(VC),cyclophosphamide group(Cy),sGPS3 group,sGPS5 group,sGPS6 group and drug control group(APS),with 6 duplications per group and 8 chickens per duplication.Each chicken except that in BC and VC groups were intramuscularly injected with 8 mg/mL cyclophosphamide 0.5 mL,while each chicken in BC and VC groups were injected with the same amount of saline,once a day for three successive days.At the 14 d of age,The chickens except BC group were vaccinated with ND vaccine,repeated vaccination at 28 days old.At the first vaccination,the chickens in three sGPSs groups were injected with 0.5 mL of 1 mg/mL sGPS 3,sGPS 5 and sGPS 6,respectively.The chickens in APS group were intramuscularly injected with 0.5 mL Astragalus polysaccharide,while that in Cy,VC and BC groups were injected with the same amount of saline,once a day for three successive days.Six chickens were selected randomly from each group for collecting wing venous blood on 7,14,21 and 28 days after the first vaccination,and the serum ND-HI antibody titer were determined byβ-micro method,IFN-γand IL-2 contents were determined by ELISA.The body weighed,thymus,spleen,bursa of Fabricius were collected after culling,and the immune organ indexes were calculated.The result showed that the serum ND-HI antibody titer,IFN-γand IL-2 contents and bursa of Fabricius index of each administration groups were higher than that of the Cy group(P<0.05);the serum ND-HI antibody titer and IFN-γcontents at 21 d,IL-2 content at 21 and 28 d in sGPS 6 group were significantly higher than that of other groups(P<0.05);At 21 and 28 d after first vaccination,the body weight and bursa of Fabricius index in sGPS 6 group were significantly higher than that of other three administration groups(P<0.05).At 28 d after first vaccination,the thymus and spleen indexes in sGPS 6 group were significantly higher than that of other three administration groups(P<0.05).In conlusion,the selenizing garlic polysaccharide had the antagonistic effect on immunosuppressed chicken induced by cyclophosphamide,and sGPS 6 had the better effect which could be used as candidate drug for novel immunosuppressive antagonists.