The effects of HIV Tat DNA on regulating the immune response of HIV DNA vaccine in mice.
BACKGROUND
HIV trans-activator protein (Tat) is the crucial factor to control HIV transcription, and is usually considered as an important immunogen for the design of HIV vaccine. Recent studies reported some special bio-activities of Tat protein on immunoregulation. However, to date, few studies have focused on exploring the effects of Tat expression plasmid (pTat) on regulating the immune responses induced by HIV DNA vaccines. In this study, our main objective is to investigate the immunoregulation mediated by pTat in mice.


METHODS
Four gene-coding plasmids (pTat, pGag, pEnv and pPol) were constructed, and the gene expression was detected by western blot method. The effects of pTat on regulating the immune responses to antigens Gag, Env, Pol were assessed by enzyme-linked immunospot and enzyme-linked immunosorbent assay. The data was analysed by one-way analysis of variance.


RESULTS
After two immunizations, mice vaccinated with antigen expressing plasmid (pGag, pEnv or pPol) plus pTat exhibited significantly stronger IFN-gamma response than that vaccinated with the corresponding antigen alone. Moreover, mice receiving two injections of antigen plus pTat exhibited the same strong IFN-gamma response as those receiving three injections of antigen alone did. Furthermore, addition of pTat not only induced a more balanced Th1 and Th2 response, but also broadened IgG subclass responses to antigens Gag and Pol.


CONCLUSIONS
pTat exhibited the appreciable effects on modulating immune responses to HIV antigens Gag, Env and Pol, providing us interesting clues on how to optimize HIV DNA vaccine.
Department of Clinical Laboratory, Chinese P, L, A, General Hospital, No, 28 Fuxing Road, Beijing 100853, China. yulongc@263.net.
Ye
Y
Liu
Fusheng
F
Li
Zhi
Z
Qi
Yanling
Y
Hao
Kunxue
K
Hong
Yong
Y
Liu
Yulong
Y
Cong
Yiming
Y
Shao
D016915:AIDS Vaccines / Q000008:administration & dosage / Q000235:genetics* / Q000276:immunology*; D000818:Animals; D005260:Female; D007371:Interferon-gamma / Q000378:metabolism*; D051379:Mice; D014611:Vaccination / Q000379:methods; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000235:genetics* / Q000276:immunology*; D054299:env Gene Products, Human Immunodeficiency Virus / Q000235:genetics / Q000276:immunology; D054301:gag Gene Products, Human Immunodeficiency Virus / Q000235:genetics / Q000276:immunology; D054302:pol Gene Products, Human Immunodeficiency Virus / Q000235:genetics / Q000276:immunology; D054322:tat Gene Products, Human Immunodeficiency Virus / Q000235:genetics*
D016915:AIDS Vaccines; D019444:Vaccines, DNA; D054299:env Gene Products, Human Immunodeficiency Virus; D054301:gag Gene Products, Human Immunodeficiency Virus; D054302:pol Gene Products, Human Immunodeficiency Virus; D054322:tat Gene Products, Human Immunodeficiency Virus; D007371:Interferon-gamma