Donor-defined mesenchymal stem cell antimicrobial potency against nontuberculous mycobacterium

Area of Science:

• Microbiology
• Cell Biology
• Immunology

Background:

• Chronic nontuberculous mycobacterial infections, particularly with Mycobacterium avium and Mycobacterium intracellulare, significantly impact patients with bronchiectasis, chronic obstructive airway disease, and the elderly.
• These intracellular pathogens lead to substantial morbidity and mortality.
• Current macrolide antibiotic treatments are often toxic and ineffective for complete infection eradication.

Purpose of the Study:

• To investigate the antimicrobial and anti-inflammatory properties of human marrow-derived mesenchymal stem cells.
• To evaluate their efficacy in treating chronic Mycobacterium avium and/or Mycobacterium intracellulare infections.

Main Methods:

• In vitro studies assessing antimicrobial and anti-inflammatory effects.
• In vivo studies using a sustained infection model of M. avium and/or M. intracellulare.

Main Results:

• Human marrow-derived mesenchymal stem cells demonstrated antimicrobial activity.
• Mesenchymal stem cells exhibited anti-inflammatory properties.
• These effects were observed both in vitro and in a sustained in vivo infection model.

Conclusions:

• Human marrow-derived mesenchymal stem cells possess significant antimicrobial and anti-inflammatory capabilities.
• Mesenchymal stem cells represent a promising novel therapeutic strategy for chronic nontuberculous mycobacterial infections.