Virus Genes

, Volume 8, Issue 3, pp 249–270 | Cite as

HIV-1 proteins in infected cells determine the presentation of viral peptides by HLA class I and class II molecules and the nature of the cellular and humoral antiviral immune responses—A review

  • Yechiel Becker
Article
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Accepted:

Abstract

The goals of molecular virology and immunology during the second half of the 20th century have been to provide the conceptual approaches and the tools for the development of safe and efficient virus vaccines for the human population. The success of the vaccination approach to prevent virus epidemics was attributed to the ability of inactivated and live virus vaccines to induce a humoral immune response and to produce antiviral neutralizing antibodies in the vaccinees. The successful development of antiviral vaccines and their application to most of the human population led to a marked decrease in virus epidemics around the globe. Despite this remarkable achievement, the developing epidemics of HIV-caused AIDS (accompanied by activation of latent herpesviruses in AIDS patients), epidemics of Dengue fever, and infections with respiratory syncytial virus may indicate that conventional approaches to the development of virus vaccines that induce antiviral humoral responses may not suffice. This may indicate that virus vaccines that induce a cellular immune response, leading to the destruction of virus-infected cells by CD8+ cytotoxic T cells (CTLs), may be needed. Antiviral CD8+ CTLs are induced by viral peptides presented within the peptide binding grooves of HLA class I molecules present on the surface of infected cells. Studies in the last decade provided an insight into the presentation of viral peptides by HLA class I molecules to CD8+ T cells. These studies are here reviewed, together with a review of the molecular events of virus replication, to obtain an overview of how viral peptides associate with the HLA class I molecules. A similar review is provided on the molecular pathway by which viral proteins, used as subunit vaccines or inactivated virus particles, are taken up by endosomes in the endosome pathway and are processed by proteolytic enzymes into peptides that interact with HLA class II molecules during their transport to the plasma membrane of antigen-presenting cells. Such peptides are identified by T-cell receptors present on the plasma membrane of CD4+ T helper cells. The need to develop viral synthetic peptides that will have the correct amino acid motifs for binding to HLA class I A, B, and C haplotypes is reviewed.

The development of HIV vaccines that will stimulate, in an uninfected individual, the humoral (antibody) and cellular (CTL) immune defenses against HIV and HIV-infected cells, respectively, and may lead to protection from primary HIV infection are discussed. The need to eliminate the release of HIV virions from infected cells introduced by an infected donor to an uninfected recipient may require both the humoral and cellular immune responses. However, such CTLs may fail to identify HIV-infected cells with integrated HIV proviral DNA that do not express viral genes and proteins. Based on reported results on the immunization of monkeys with uninfected cells, which prevented infection with SIV grown in the same type of cells, it may be possible to consider immunization of specific human populations against HLA haplotypes prevalent in HIV-infected donors. Since HIV virions may carry the HLA class I molecules present in the infected donors' cells, synthesis of CTLs to the mutated amino acid sequence in peptide binding grooves of the foreign HLA haplotypes may induce anti-HLA CTLs in the immunized individual, which may destroy HIV-infected, virus synthesizing donor cells, as well as donor cells containing latent proviral DNA. Such anti-foreign HLA CTLs may prevent the release of virions from the infecting donor's cells. The importance of HLA haplotypes for protection against HIV will be discussed.

Key words

HIV-1 AIDS virus synthesis of virus viral proteins cellular transport HLA class I HLA class II immune system 
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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Yechiel Becker
    • 1
  1. 1.Department of Molecular Virology, Faculty of MedicineThe Hebrew University of JerusalemJerusalemIsrael

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