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Metformin as adjunct antituberculosis therapy.

Amit Singhal1, Liu Jie2, Pavanish Kumar2

  • 1Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Singapore 138648, Singapore. amit_singhal@immunol.a-star.edu.sg gennaro_delibero@immunol.a-star.edu.sg.

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This summary is machine-generated.

The antidiabetic drug metformin reduces Mycobacterium tuberculosis growth by enhancing host immune responses. Metformin shows promise as an adjunctive therapy for tuberculosis, improving treatment efficacy and reducing disease severity.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Pharmacology

Background:

  • Tuberculosis (TB) poses a significant global health challenge.
  • Augmenting host immune responses is a potential therapeutic strategy for TB.
  • Drug-resistant Mycobacterium tuberculosis (Mtb) strains complicate treatment.

Purpose of the Study:

  • To investigate the potential of metformin (MET) as an adjunctive host-directed therapy for TB.
  • To elucidate the mechanism by which MET affects Mtb intracellular growth.

Main Methods:

  • Assessed MET's effect on Mtb growth in vitro, including drug-resistant strains.
  • Investigated MET's impact on host cell functions like phagosome-lysosome fusion and mitochondrial reactive oxygen species production.
  • Evaluated MET's efficacy in Mtb-infected mouse models, assessing lung pathology and immune responses.
  • Analyzed data from two human cohorts treated with MET.

Main Results:

  • Metformin inhibited intracellular Mtb growth in an AMPK-dependent manner.
  • MET treatment enhanced mitochondrial reactive oxygen species production and facilitated phagosome-lysosome fusion.
  • In mice, MET reduced lung pathology, chronic inflammation, and improved immune responses.
  • MET treatment correlated with better Mtb infection control and reduced disease severity in human cohorts.

Conclusions:

  • Metformin demonstrates significant potential as a host-adjunctive therapy for tuberculosis.
  • MET enhances host immune mechanisms crucial for controlling Mtb infection.
  • Further clinical evaluation of metformin for TB treatment is warranted.