Davis H L, McCluskie M J, Gerin J L, Purcell R H
Loeb Medical Research Institute, Ottawa Civic Hospital, ON, Canada.
Proc Natl Acad Sci U S A. 1996 Jul 9;93(14):7213-8. doi: 10.1073/pnas.93.14.7213.
Vaccination of two chimpanzees against hepatitis B virus (HBV) by intramuscular injection of plasmid DNA encoding the major and middle HBV envelope proteins induced group-, subtype- and preS2-specific antibodies. These were initially of IgM isotype, and then they were of IgG (predominantly IgGl) isotype. The chimpanzee injected with 2 mg of DNA attained >100 milli-international units/ml of anti-HBs antibody after one injection and 14,000 milli-international units/ml after four injections. A smaller dose (400 microg) induced lower and transient titers, but a strong anamnestic response occurred 1 year later. Comparison with responses in 23 chimpanzees receiving various antigen-based HBV vaccines suggests that the DNA approach is promising for prophylactic immunization against HBV.
通过肌肉注射编码乙肝病毒(HBV)主要和中包膜蛋白的质粒DNA对两只黑猩猩进行乙肝疫苗接种,诱导产生了组特异性、亚型特异性和前S2特异性抗体。这些抗体最初为IgM同种型,随后为IgG(主要是IgG1)同种型。注射2毫克DNA的黑猩猩在一次注射后抗-HBs抗体达到>100毫国际单位/毫升,四次注射后达到14000毫国际单位/毫升。较小剂量(400微克)诱导产生较低且短暂的滴度,但1年后出现强烈的回忆反应。与23只接受各种基于抗原的乙肝疫苗的黑猩猩的反应进行比较表明,DNA方法在预防乙肝病毒免疫方面很有前景。