抗猪圆环病毒药物体外筛选研究
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摘要
猪圆环病毒感染是由猪圆环病毒引起的一种传染病,猪圆环病毒感染疾病遍及世界各个养猪国家和地区,已然成为严重危害养猪业的重要传染病。虽然有报道猪圆环病毒疫苗研制成功,但是由于上市的时间不长,在临床上使用还不广泛,而且疫苗的效果也有待观察,因此在临床上猪圆环病毒病主要采取药物治疗,但临床用药混乱,疗效不确切,迫切需要筛选高效防治药物。本研究对临床上常用的抗病毒药物金刚烷胺、利巴韦林、盐酸阿比朵尔、黄连、金银花、连翘、板蓝根对猪圆环病毒的活性抑制作用进行了检测,以期筛选出高效药物,为临床防治该病提供选药依据。
     MTT染色法能定量检测细胞的增殖活性,来间接反应药物的抗病毒效果。为此我们将MTT作为细胞培养物中病毒增殖情况的指示系统。本研究利用PK-15细胞建立抗猪圆环病毒药物的筛选模型,设立正常细胞对照组。96孔板培养细胞24 h,细胞长成单层细胞后,每孔加入猪圆环病毒液,继续培养6 h。在无毒性浓度范围内加入不同浓度药物,继续培养24 h,加入MTT培养4 h,小心吸取上清液弃去,加入二甲基亚砜,37℃下孵育30 min,用酶标仪在490 nm下测定OD值,根据公式计算病毒的抑制率和药物的TI。
     中药提取物抗猪圆环病毒活性结果:黄连的IC50为363.2μg/mL,治疗指数TI为13.8,金银花的IC50为719.7μg/mL,治疗指数TI为4.1,连翘的IC50为1 596.7μg/mL,治疗指数TI为4.6,板蓝根的IC50为1 189.4μg/mL,治疗指数TI为5.0,筛选出了高效的抗病毒中药药物黄连。
     化学药物抗猪圆环病毒活性的结果:利巴韦林的IC50为5.53μg/mL,治疗指数TI为33.8,金刚烷胺的IC50为1.19μg/mL,治疗指数TI为124.9,盐酸阿比朵尔的IC50为6.85μg/mL,治疗指数TI为33.1,筛选出了高效抗病毒药物金刚烷胺。
     试验结果表明,实验药物对猪圆环病毒均具有抑制作用,中药的抗病毒活性总体上要低于西药;中药中,黄连的抗病毒活性最高;西药中,金刚烷胺的抗病毒活性最高。
Porcine circovirus (PCV) results in porcine dermatitis and nephropathy syndrome (PDNS), postweaning multisystemic wasting syndrome (PMWS), piglet congenital tremor (PT) and other serious diseases. The PCV infection has extended all over the world which has been considered as an important pathogen. It is reported that PCR vaccine has been prepared. Because of a short life time, commercial vaccines are short of clinical application and evaluation. Therefore, the major clinical treatment for CPV is using antivirus medicine. Nowadays, there are sorts of antivirus medicines for clinical application, but efficient medicine is required pressing. In this study, some normal antivirus medicines were detected to screen active medicine anti PCV.
     In this study, PK-15 cell stem was used as the model for screening. The blank control and PCV-infected group were set. MTT assay is able to quantity detect alive cells to indirectly evaluation the effect of antivirus medicines. The cells were seeded into 96-well plate and cultured. PCV was added to monolayer cells and incubated for 6 h. the medicines in different dilution were added and the cells were incubated for 24 h. MTT was added and incubated for 4 h. The supernatant was removed, and the wells were added into dimethyl sulfoxide. The wells were incubated at 37℃for 30 min. the OD value at 490 nm was measured by microplate reader. The virus inhibition and medicine therapeutic index was calculated according to the formula. Results of Chinese medicine against Porcine Circovirus in vitro:The half maximal inhibitory concentration (IC50) of rhizoma coptidis, honeysuckle, fructus forsythiae and isatis root were 363.2, 719.7, 1596.7, 1189.4μg/mL; The therapeutic index(TI) of rhizoma coptidis, honeysuckle, fructus forsythiae and isatis root were 13.8, 4.1, 4.6 and 5.0。The results indicate that four Chinese medicine all could inhibit the prolification of porcine circovirus at cell level,but the effect of rhizoma coptidis are the most significant.
     Results of drugs against Porcine Circovirus in vitro:The half maximal inhibitory concentration (IC50) of amantadine, ribavirin, arbidol hydrochlorid were 5.53, 1.19, 6.85μg/mL; The therapeutic index(TI) of amantadine, ribavirin, arbidol hydrochlorid were 33.8, 124.9and 33.1。The results indicate that three drugs all could inhibit the prolification of porcine circovirus at cell level,but the effect of ribavirin are the most significant.
     The results showed that antivirus activity of chemical drugs is stronger than traditional Chinese medicine. Among the traditional Chinese medicine, rhizoma coptidis is the strongest. Among the chemical medicine, amantadine is the strongest.
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