Morphine alters M. bovis infected microglia's ability to activate γδ T lymphocytes

Area of Science:

• Neuroimmunology
• Infectious Diseases
• Central Nervous System (CNS) Research

Background:

• Microglia are key immune cells in the CNS, crucial for brain defense and susceptible to Mycobacterium infection.
• Opiates can suppress immune functions, potentially compromising the brain's ability to fight infections like CNS Tuberculosis.

Purpose of the Study:

• To investigate if Mycobacterium-infected microglia can activate gamma-delta T (γδT) lymphocytes.
• To determine if the opiate morphine affects microglia's capacity to activate γδT lymphocytes.

Main Methods:

• Exposure of γδT lymphocytes to microglia infected with Mycobacterium bovis.
• Assessment of γδT lymphocyte proliferation, Interferon-gamma (IFN-γ) production, and cytolytic activity.
• Evaluation of the impact of morphine treatment on these immune responses.

Main Results:

• Mycobacterium bovis-infected microglia successfully activated γδT lymphocytes, inducing proliferation, IFN-γ production, and cytotoxicity.
• Morphine treatment significantly impaired both IFN-γ production and antigen-specific cytotoxicity of γδT lymphocytes activated by infected microglia.

Conclusions:

• Microglia play a vital role in initiating adaptive immune responses in the CNS against Mycobacterium infection via γδT lymphocyte activation.
• Morphine compromises the immune signaling pathway between microglia and γδT lymphocytes, potentially increasing susceptibility to CNS infections like tuberculosis.