Researchers at the University at Buffalo, led by Jessica L. Reynolds, describe a new inhalable nanoparticle treatment for tuberculosis in Antimicrobial Agents and Chemotherapy. The system encapsulates rifampin in a biodegradable core, adds an outer coating that helps particles adhere to macrophages, and presents a natural molecule on the surface that improves uptake by immune cells and boosts immune activity.
According to first author Hilliard L. Kutscher, the particles are designed to reach the lungs and be taken up by lung macrophages where TB bacteria persist. The particles slowly release rifampin, stimulate immune responses, and limit drug exposure to the rest of the body, which may reduce systemic side effects. Because the drug remains in the lung much longer with inhaled delivery, dosing might be reduced to once a week rather than daily.
The researchers tested the approach in two mouse models — one representing a typical TB lung infection and a second, more severe model that mimics human lung damage and is harder to treat. Work with Mycobacterium tuberculosis was done in a certified BSL-3 facility.
Next steps include integrating the nanoparticle with other standard TB antibiotics for combination therapy. Coauthor Patrick O. Kenney notes that targeted lung delivery could also help treat serious non-tuberculous mycobacterial lung infections and reduce harmful drug–drug interactions when rifampin is used. The study was funded by the National Institute of Allergy and Infectious Diseases (NIAD) of the National Institutes of Health.
Difficult words
- nanoparticle — Very small particle measured at nanoscale.
- encapsulate — To surround and hold a drug inside.encapsulates
- biodegradable — Able to break down naturally by biological processes.
- macrophage — Immune cell that ingests bacteria and debris.macrophages
- uptake — The process of cells taking in substances.
- systemic — Affecting or spreading through the whole body.
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- What advantages and possible risks do you see in using inhalable nanoparticles for TB treatment? Give reasons.
- How could targeted lung delivery reduce harmful drug–drug interactions when rifampin is used?
- Based on the article, what further tests or evidence would be important before testing this treatment in humans?
