The cortical actin determines different susceptibility of naïve and memory CD4+ T cells to HIV-1 cell-to-cell transmission and infection

PLoS One. 2013 Nov 11;8(11):e79221. doi: 10.1371/journal.pone.0079221. eCollection 2013.

Abstract

Memory CD4+ T cells are preferentially infected by HIV-1 compared to naïve cells. HIV-1 fusion and entry is a dynamic process in which the cytoskeleton plays an important role by allowing virion internalization and uncoating. Here, we evaluate the role of the cortical actin in cell-to-cell transfer of virus antigens and infection of target CD4+ T cells. Using different actin remodeling compounds we demonstrate that efficiency of HIV-internalization was proportional to the actin polymerization of the target cell. Naïve (CD45RA+) and memory (CD45RA-) CD4+ T cells could be phenotypically differentiated by the degree of cortical actin density and their capacity to capture virus. Thus, the higher cortical actin density of memory CD4+ T cells was associated to increased efficiency of HIV-antigen internalization and the establishment of a productive infection. Conversely, the lower cortical actin density in naïve CD4+ T cells restricted viral antigen transfer and consequently HIV-1 infection. In conclusion, the cortical actin density differentially affects the susceptibility to HIV-1 infection in naïve and memory CD4+ T cells by modulating the efficiency of HIV antigen internalization.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actins / immunology*
  • Antigens, Viral / immunology*
  • Biological Transport / immunology
  • CD4-Positive T-Lymphocytes / immunology*
  • CD4-Positive T-Lymphocytes / pathology
  • Cells, Cultured
  • Female
  • HIV Infections / immunology*
  • HIV Infections / pathology
  • HIV Infections / transmission
  • HIV-1 / immunology*
  • Humans
  • Immunologic Memory*
  • Leukocyte Common Antigens / immunology
  • Male

Substances

  • Actins
  • Antigens, Viral
  • Leukocyte Common Antigens

Grants and funding

This work was supported by the Spanish Ministry of Commerce and Competitiveness (MINECO), project BFU2012-06958 and Gala Against AIDS. MP and EP are research fellows from MINECO. MP is a research fellow from Fondo de Investigación Sanitaria (FIS). The authors declare no competing interests. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.