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Updated: May 21, 2026

Polarization of M1 and M2 Human Monocyte-Derived Cells and Analysis with Flow Cytometry upon Mycobacterium tuberculosis Infection
Published on: September 18, 2020
Interferon-γ Stimulation Fails to Restrict Mycobacterium tuberculosis Growth in Human Monocyte-Derived and Alveolar
Mark C Fernandez1, Glenna J Peterson1, Chris Le1
1Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Abstract:
We examined whether interferon-γ (IFNG) restricts Mycobacterium tuberculosis growth in human macrophages across a range of conditions and methods. We observed an IFNG-dependent enhancement of bacterial replication in macrophage colony-stimulating factor-differentiated monocyte-derived macrophages (4.84 × 105 colony-forming units [CFU] IFNG stimulated vs 2.48 × 105 CFU untreated, P < .001) with 4 M. tuberculosis strains. M. tuberculosis replication was not restricted by IFNG treatment of alveolar macrophages. In agreement with previous studies, IFNG-stimulated murine bone marrow-derived macrophages effectively restricted M. tuberculosis replication. These data suggest that M. tuberculosis resists IFNG-stimulated immunity within human macrophages with implications for distinct host species immune responses.
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