Methods and Models for Studying Mycobacterium tuberculosis in Respiratory Infections

Area of Science:

• Infectious Diseases
• Immunology
• Biomedical Engineering

Background:

• Respiratory infections, particularly tuberculosis (TB) caused by Mycobacterium tuberculosis (Mtb), are a significant global health concern.
• Mtb's ability to persist, evade immune responses, and develop drug resistance complicates TB diagnosis and treatment.
• Traditional research models (animal, 2D in vitro) inadequately replicate human immune responses, especially granuloma formation in TB.

Purpose of the Study:

• To review the advantages of three-dimensional (3D) in vitro systems for studying TB pathogenesis.
• To highlight how 3D models bridge the gap between experimental research and clinical applications.
• To emphasize the potential of 3D systems in addressing host and pathogen genetic variability in TB research.

Main Methods:

• Review of emerging three-dimensional (3D) in vitro systems, including organoids and lung-on-chip platforms.
• Analysis of how these models recreate the structural and functional complexity of human lung granulomas.
• Examination of cellular interactions, oxygen gradients, and nutrient limitations within 3D TB models.

Main Results:

• 3D in vitro systems provide a more physiologically relevant platform for studying TB.
• These models accurately recapitulate key features of tubercular granulomas, offering deeper insights into Mtb pathogenesis.
• 3D systems facilitate the study of host-pathogen interactions, including genetic variability.

Conclusions:

• Emerging 3D in vitro models represent a significant advancement in TB research.
• These systems offer superior recapitulation of human lung physiology compared to traditional models.
• 3D platforms hold promise for accelerating the development of novel diagnostic and therapeutic strategies for TB.