ipsvirus 发表于 2015-7-6 15:46:38

请教:血清IgG1和IgG2a抗体是什么东西?

原帖由hantavirus 2008-6-7 17:58发表于老论坛

请教:血清IgG1和IgG2a抗体是什么东西?能说明什么?很多疫苗试验中为什么要测IgG1/IgG2a比值?困惑中。。。。
请大家不吝赐教,谢谢!

ipsvirus 发表于 2015-7-6 15:46:58

#Rojjer

这一般是评价疫苗诱导的应答是偏向于Th1还是Th2型(为Th细胞的两个分化方向,Th1可以分泌多种细胞因子如干扰素促进CTL反应即所谓的细胞免疫倾向,而Th2则可以分泌细胞因子IL-4促进抗体产生即所谓的体液免疫倾向,当然这两种方向只是偏向而已)
在小鼠体内,Th1型会产生IgG2a型抗体,Th2型则会产生IgG1型抗体。但是在人体内则是相反的。
所以我们经常会用IgG1/IgG2a来评价疫苗诱导的免疫应答是偏向于哪种应答!
不知道楼主是否明白!

ipsvirus 发表于 2015-7-6 15:48:05

#endosome

BALB/c mice typically respond to vaccines and subunit vaccines with a Th2-type immune response, which is associated with the stimulation of IgG1 antibodies . However, the major antibody isotype present in the sera of mice that survive viral infections is IgG2a , which is stimulated during Th1-type immune responses . Stimulation of IgG2a antibodies has been associated with increased efficacy ofvaccination . Additionally, monoclonal antibodies of the IgG2a isotype are more efficient at clearingvirus infections than monoclonal antibodies of the IgG1 isotype displaying similar antigenic specificities.

ipsvirus 发表于 2015-7-6 15:48:30

#feng84

在人类IGG中 如果是抗多糖类抗原活性基本取决与IGG1和IGG2而抗蛋白和病毒的就有IGG1,IGG3

ipsvirus 发表于 2015-7-6 15:48:46

#158584843

猪和人的IgG1和2是一样,和小鼠是反的。
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