In vitro Control of RNA Virus Infections by M1-Polarized Human Monocyte-Derived Macrophages

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Human macrophages possess dual origins: embryonic tissue-resident macrophages (TRM) and bone marrow-derived monocytes (MDM).
• Macrophages exhibit polarization into M1 (pro-inflammatory) or M2 (anti-inflammatory) phenotypes, influencing their functions.
• Understanding macrophage responses to viral infections is crucial for developing antiviral strategies.

Purpose of the Study:

• To investigate the impact of M1/M2 macrophage polarization on the in vitro replication of Human Immunodeficiency Virus (HIV) and Zika Virus (ZIKV).
• To explore the potential of macrophage polarization as a host-directed antiviral strategy.

Main Methods:

• Primary human monocyte-derived macrophages (MDM) were differentiated and polarized into M1 or M2 phenotypes.
• MDM were infected in vitro with HIV-1 and Zika Virus (ZIKV).
• Viral replication and containment were assessed in polarized MDM.

Main Results:

• M1-polarized MDM demonstrated significant containment of both HIV-1 and ZIKV replication.
• M2-polarized MDM exhibited complex modulation of HIV-1 replication and did not impact ZIKV production.
• Macrophage polarization state critically influences RNA virus replication.

Conclusions:

• M1 polarization of human macrophages is effective in controlling diverse RNA virus infections, including HIV and ZIKV.
• Harnessing M1 macrophage polarization could offer a novel host-directed antiviral therapeutic approach.