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Updated: Jan 2, 2026

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis
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Cytoplasmic RNA Sensor Pathways and Nitazoxanide Broadly Inhibit Intracellular Mycobacterium tuberculosis Growth.

Shahin Ranjbar1, Viraga Haridas1, Aya Nambu1

  • 1Program in Cellular and Molecular Medicine, Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA.

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Host cytoplasmic RNA sensors like RIG-I and MDA5 restrict Mycobacterium tuberculosis (MTb) growth. The drug nitazoxanide enhances this innate immunity, offering a potential host-directed therapy for tuberculosis.

Keywords:
Biological SciencesImmune ResponseImmunologyMicrobiologyMolecular Microbiology

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Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • Mycobacterium tuberculosis (MTb) evades host innate immunity, particularly nucleic acid sensing mechanisms, for infection establishment.
  • Cytosolic RNA sensors play a crucial role in detecting intracellular pathogens and initiating immune responses.

Purpose of the Study:

  • To investigate the role of host cytosolic RNA sensing pathways, including RIG-I-like receptors (RLRs), MAVS, and PKR, in controlling MTb infection.
  • To evaluate the potential of targeting these RNA sensing pathways as a host-directed therapeutic strategy for tuberculosis.

Main Methods:

  • Assessed the impact of RIG-I, MDA5, MAVS, and PKR on intracellular MTb growth in human cells.
  • Measured MTb-induced gene expression and biological activity of these RNA sensing molecules.
  • Investigated the effect of nitazoxanide (NTZ) on MTb growth and RNA sensor pathway activation.

Main Results:

  • RIG-I, MDA5, MAVS, and PKR independently inhibit intracellular MTb growth.
  • MTb infection broadly stimulates the expression and activity of these key RNA sensing components.
  • Nitazoxanide significantly inhibits intracellular MTb replication and potentiates MTb-induced RNA sensor activation.

Conclusions:

  • Cytoplasmic RNA sensors function as innate restriction factors against MTb infection in human cells.
  • Targeting the RNA sensing pathway represents a promising host-directed therapeutic approach for treating tuberculosis.