Macrophage polarization: convergence point targeted by mycobacterium tuberculosis and HIV.

Frontiers in Immunology
Geanncarlo Lugo-VillarinoOlivier Neyrolles

Abstract

In the arms race of host-microbe co-evolution, macrophages (Mɸs) have been endowed with strategies to neutralize pathogenic challenge while preserving host integrity. During steady-states conditions, Mɸs perform multiple house-keeping functions governed by their differentiation state, tissue distribution, and signals from the microenvironment. In response to pathogenic challenge and host mediators, however, Mɸs undergo different programs of activation rendering them either pro-inflammatory and microbicidal (M1), or immunosuppressants and tissue repairers (M2). An excessive or prolonged polarization of either program may be detrimental to the host due to potential tissue injury or contribution to pathogenesis. Conversely, intracellular microbes that cause chronic diseases such as tuberculosis and acquired immunodeficiency syndrome exemplify strategies for survival in the host. Indeed, both Mycobacterium tuberculosis (Mtb) and human immunodeficiency virus (HIV-1) are successful intracellular microbes that thrive in Mɸs. Given these microbes not only co-circulate throughout the developing world but each has contributed to prevalence and mortality caused by the other, substantial insights into microbe physiology and host defenses t...Continue Reading

Citations

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