Metformin Alters Human Host Responses to Mycobacterium tuberculosis in Healthy Subjects

Abstract Background Metformin, the most widely administered diabetes drug, has been proposed as a candidate adjunctive host-directed therapy for tuberculosis, but little is known about its effects on human host responses to Mycobacterium tuberculosis. Methods We investigated in vitro and in vivo eff...

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Published in:The Journal of infectious diseases Vol. 220; no. 1; pp. 139 - 150
Main Authors: Lachmandas, Ekta, Eckold, Clare, Böhme, Julia, Koeken, Valerie A C M, Marzuki, Mardiana Binte, Blok, Bastiaan, Arts, Rob J W, Chen, Jinmiao, Teng, Karen W W, Ratter, Jacqueline, Smolders, Elise J, Van den Heuvel, Corina, Stienstra, Rinke, Dockrell, Hazel M, Newell, Evan, Netea, Mihai G, Singhal, Amit, Cliff, Jacqueline M, Van Crevel, Reinout
Format: Journal Article
Language:English
Published: US Oxford University Press 05.06.2019
Subjects:
Cell Proliferation - drug effects
Down-Regulation - drug effects
Healthy Volunteers
Host-Pathogen Interactions - drug effects
Humans
Hypoglycemic Agents - pharmacology
Leukocytes, Mononuclear - drug effects
Leukocytes, Mononuclear - microbiology
Metformin - pharmacology
Monocytes - drug effects
Monocytes - metabolism
Mycobacterium tuberculosis - pathogenicity
Myeloid Cells - drug effects
Myeloid Cells - metabolism
Phagocytosis - drug effects
Reactive Oxygen Species - metabolism
Signal Transduction - drug effects
Tuberculosis - metabolism
Tuberculosis - microbiology
Up-Regulation - drug effects
gene transcription
host-directed therapy
Metformin
antimycobacterial mechanisms
tuberculosis
ISSN:0022-1899, 1537-6613, 1537-6613
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Summary:Abstract Background Metformin, the most widely administered diabetes drug, has been proposed as a candidate adjunctive host-directed therapy for tuberculosis, but little is known about its effects on human host responses to Mycobacterium tuberculosis. Methods We investigated in vitro and in vivo effects of metformin in humans. Results Metformin added to peripheral blood mononuclear cells from healthy volunteers enhanced in vitro cellular metabolism while inhibiting the mammalian target of rapamycin targets p70S6K and 4EBP1, with decreased cytokine production and cellular proliferation and increased phagocytosis activity. Metformin administered to healthy human volunteers led to significant downregulation of genes involved in oxidative phosphorylation, mammalian target of rapamycin signaling, and type I interferon response pathways, particularly following stimulation with M. tuberculosis, and upregulation of genes involved in phagocytosis and reactive oxygen species production was increased. These in vivo effects were accompanied by a metformin-induced shift in myeloid cells from classical to nonclassical monocytes. At a functional level, metformin lowered ex vivo production of tumor necrosis factor α, interferon γ, and interleukin 1β but increased phagocytosis activity and reactive oxygen species production. Conclusion Metformin has a range of potentially beneficial effects on cellular metabolism, immune function, and gene transcription involved in innate host responses to M. tuberculosis. Metformin has shown beneficial effects in a murine model of tuberculosis. Using in-vitro and in-vivo studies we show that metformin has beneficial effects on cellular metabolism, immune function and genetranscription involved in innate host responses to M. tuberculosis in humans.
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ISSN:0022-1899
1537-6613
1537-6613
DOI:10.1093/infdis/jiz064