›› 2011, Vol. 38 ›› Issue (11): 174-177.

• 疾病防治 • 上一篇    下一篇

鸭瘟强毒株和疫苗株对雏鸭IFN-γ基因表达的影响

谢秀兰1, 杨发龙2, 李阳友3, 马小明1, 岳华2   

  1. 1. 宁夏农林科学院草畜工程中心,宁夏银川 750002;2. 西南民族大学生命科学与技术学院,四川成都 610041;3. 川北医学院实验动物中心,四川南充 637002
  • 收稿日期:2011-04-06 修回日期:1900-01-01 出版日期:2011-11-20 发布日期:2011-11-20
  • 通讯作者: 李阳友

Dynamics of IFN-γ mRNA Expression in Ducks Induced by Duck Plague Virus and Attenuated Virus

XIE Xiu-lan1, YANG Fa-long2, LI Yang-you3, MA Xiao-ming1, YUE Hua2   

  1. 1. Breeding Engineering Technology Center,Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China;2. College of Life Science and Technology,Southwest University for Nationalities,Chengdu 610041, China;3. Laboratory Animal Center,North Sichua Medical College,Nanchong 637002, China
  • Received:2011-04-06 Revised:1900-01-01 Online:2011-11-20 Published:2011-11-20

摘要: 本试验旨在探讨不同毒力的鸭瘟病毒(DPV)感染对雏鸭INF-γ mRNA表达水平的影响,为DPV的感染与免疫机制提供理论依据。应用实时荧光定量PCR技术,对接种了鸭瘟强毒株和疫苗株的雏鸭肝脏及外周血淋巴细胞(PBL)中IFN-γ mRNA的表达水平及鸭瘟病毒(DPV)的荷载量进行动态定量监测。结果表明:①感染鸭瘟强毒后,IFN-γ mRNA 在肝脏中的表达没有明显规律,PBL中IFN-γ mRNA表达水平很高,在此期间(1~12 h),病毒DNA量很少。IFN-γ mRNA表达量在6 h后大幅下降,直到144 h都非常低,而病毒的载量逐渐增大,至144 h时达到峰值。②接种弱毒疫苗后,肝脏中IFN-γ mRNA表达水平较高且稳定,至12 h达到顶峰,约比对照高出8倍。PBL中IFN-γ mRNA表达量较低且不稳定。弱毒DNA荷载量稳定上升,但载量约比强毒低两个数量级。病毒DNA在PBL检测不到。IFN-γ在抵抗鸭瘟强毒中发挥了重要作用;IFN-γ在肝脏中高水平的表达可能是鸭瘟疫苗的免疫机制之一。

关键词: IFN-γ; 鸭瘟病毒; 强毒; 弱毒

Abstract: To understand the mechanisms of DPV infection and immunity,the IFN-γ mRNA expression was investigated after infection with virulent and attenuated duck plague virus. The mRNA levels of IFN-γ in liver and PBL were evaluated dynamically after inoculation with virulent and attenuated DPV respectively by real-time PCR. The virus loads were also assessed. Results:①After infection by virulent DPV, IFN-γ mRNA levels in liver didn't show regulatory changes while high level of IFN-γ mRNA levels in PBL and few virus DNA could be detected in the early stage of infection (1-12 h). IFN-γ mRNA expression decreased dramatically after 6 h post infection and persisted in a very low level until death (144 h).Virus load increased gradually and reached peak at 144 h. ②After vaccination with attenuated DPV strain, there were persist and high levels of IFN-γ mRNA expression in liver,reached peak at 12 h (8 times higher than control), while the level in PBL was lower and unstable. The attenuated DPV loads increased dramatically with a relative low copy number in liver. However, the virus DNA could not be detected in PBL. IFN-γ possibly plays an important role in protecting ducks against virulent virus infection. It is also suggested that high level expression of IFN-γ in liver induced by attenuated DPV could enhance immunity against DPV infection.

Key words: IFN-γ; duck plague virus; virulent strain; attenuated strain

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