The macrophage in HIV-1 infection: from activation to deactivation?

Retrovirology. 2010 Apr 9:7:33. doi: 10.1186/1742-4690-7-33.

Abstract

Macrophages play a crucial role in innate and adaptative immunity in response to microorganisms and are an important cellular target during HIV-1 infection. Recently, the heterogeneity of the macrophage population has been highlighted. Classically activated or type 1 macrophages (M1) induced in particular by IFN-gamma display a pro-inflammatory profile. The alternatively activated or type 2 macrophages (M2) induced by Th-2 cytokines, such as IL-4 and IL-13 express anti-inflammatory and tissue repair properties. Finally IL-10 has been described as the prototypic cytokine involved in the deactivation of macrophages (dM). Since the capacity of macrophages to support productive HIV-1 infection is known to be modulated by cytokines, this review shows how modulation of macrophage activation by cytokines impacts the capacity to support productive HIV-1 infection. Based on the activation status of macrophages we propose a model starting with M1 classically activated macrophages with accelerated formation of viral reservoirs in a context of Th1 and proinflammatory cytokines. Then IL-4/IL-13 alternatively activated M2 macrophages will enter into the game that will stop the expansion of the HIV-1 reservoir. Finally IL-10 deactivation of macrophages will lead to immune failure observed at the very late stages of the HIV-1 disease.

Publication types

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

MeSH terms

  • Cytokines / immunology
  • HIV-1 / immunology*
  • HIV-1 / pathogenicity*
  • Humans
  • Macrophage Activation*
  • Macrophages / immunology*
  • Macrophages / virology*
  • Models, Biological
  • Virus Replication*

Substances

  • Cytokines