CD36 deficiency attenuates experimental mycobacterial infection

Area of Science:

• Immunology
• Microbiology
• Cell Biology

Background:

• CD36 scavenger receptor family members sense microbial products, mediating phagocytosis and inflammation.
• CD36's role in host response to mycobacterial infections was investigated.

Purpose of the Study:

• To investigate the role of CD36 in host response to mycobacterial infection.
• To determine if CD36 deficiency impacts mycobacterial burden, granuloma formation, and host immune responses.

Main Methods:

• Experimental infection of wild-type (Cd36+/+) and CD36-deficient (Cd36-/-) mice with Mycobacterium bovis Bacillus Calmette-Guérin (BCG).
• In vitro co-cultivation of Mycobacterium tuberculosis, BCG, and M. marinum with wild-type and CD36-deficient murine macrophages.
• Assessment of mycobacterial burden, granuloma density, cytokine levels, and intracellular bacterial growth.

Main Results:

• CD36 deficiency led to reduced mycobacterial burden in the liver and spleen of infected mice.
• Lower granuloma density and circulating TNF levels were observed in CD36-deficient mice.
• Intracellular growth of multiple mycobacterial species was significantly reduced in CD36-deficient macrophages in vitro.

Conclusions:

• CD36 deficiency confers resistance to mycobacterial infection.
• Reduced intracellular survival of mycobacteria in CD36-deficient macrophages contributes to resistance.
• CD36 is implicated in granuloma formation, facilitating early bacterial expansion and dissemination.