特异性脱氧核酶对小鼠呼吸道合胞病毒感染的抑制作用

目的 研究特异性抑制呼吸道合胞病毒(respiratory syncytial virus,RSV)N基因的脱氧核酶DZ1133在小鼠体内对病毒复制和气道炎症的影响.方法 RSV感染BALB/c小鼠滴鼻给予DZ1133及其变异体、反义寡核苷酸AS1133,空斑形成实验检测肺组织病毒滴度,RT-PCR检测病毒mRNA表达,支气管肺泡灌洗液白细胞计数,ELISA检测TNF-α、IL-12、IFN-γ和IL-10水平,肺组织病理学分析炎症情况.结果 0.2、0.4 mg和0.8 mg DZ1133治疗组小鼠肺组织病毒滴度分别为(2.75±0.21)×105、(1.86±0.20)×105PFU/g和(1.02±0.22)×103PFU/g,与感染对照组小鼠(7.94±0.42)×105PFU/g比较明显下降(P<0.01),上述各剂量治疗组小鼠肺组织病毒mRNA表达与感染对照组比较分别下降30.51%、47.38%(P<0.05)和53.97%(P<0.01).0.4 mg DZ1133治疗降低RSV感染小鼠支气管肺泡灌洗液中白细胞总数,改善肺组织病理学损伤(P<0.05),对TNF-α、IL-12、IFN-γ和IL-10水平无显著性影响(P>0.05).结论 特异性脱氧核酶DZ1133在小鼠体内有效抑制RSV复制、减轻气道炎症,是有效的抗RSV途径.

Special deoxyribozyme suppresses respiratory syncytial virus infection to mice

Objective To investigate the effects of special deoxyribozyme DZ1133 targeting N gene of respiratory syncytial virus ( RSV) on viral replication and airway inflammation in mice. Methods RSV infected BALB /c mice were nasally dripped with DZ1133,mutant DZ1133 and antisense oligonucleotide AS1133 respectively. Pulmonary viral titers were detected by plaque forming experiment. Pulmonary RSV N mRNA expression was assayed by RT-PCR. Leukocytes and the subgroup cells in bronchoalveolar lavage fluid ( BALF) were c...