4.7 Review

Potential of Neuroinflammation-Modulating Strategies in Tuberculous Meningitis: Targeting Microglia

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AGING AND DISEASE
卷 -, 期 -, 页码 -

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INT SOC AGING & DISEASE
DOI: 10.14336/AD.2023.0311

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tuberculous meningitis; neuroinflammation; host-directed therapy; microglia; cytokines

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Tuberculous meningitis (TBM) is a severe complication of tuberculosis (TB) with high rates of disability and mortality. Microglia, the core of the immune network in the central nervous system, are directly infected by Mycobacterium tuberculosis (M. tb) and play a complex role in TBM. Host-directed therapy (HDT) has emerged as a potential adjunct therapy for TBM by controlling neuroinflammation. This review discusses the diverse roles of microglia in TBM and potential HDT approaches targeting microglia.
Tuberculous meningitis (TBM) is the most severe complication of tuberculosis (TB) and is associated with high rates of disability and mortality. Mycobacterium tuberculosis (M. tb), the infectious agent of TB, disseminates from the respiratory epithelium, breaks through the blood-brain barrier, and establishes a primary infection in the meninges. Microglia are the core of the immune network in the central nervous system (CNS) and interact with glial cells and neurons to fight against harmful pathogens and maintain homeostasis in the brain through pleiotropic functions. However, M. tb directly infects microglia and resides in them as the primary host for bacillus infections. Largely, microglial activation slows disease progression. The non-productive inflammatory response that initiates the secretion of pro-inflammatory cytokines and chemokines may be neurotoxic and aggravate tissue injuries based on damages caused by M. tb. Host-directed therapy (HDT) is an emerging strategy for modulating host immune responses against diverse diseases. Recent studies have shown that HDT can control neuroinflammation in TBM and act as an adjunct therapy to antibiotic treatment. In this review, we discuss the diverse roles of microglia in TBM and potential host-directed TB therapies that target microglia to treat TBM. We also discuss the limitations of applying each HDT and suggest a course of action for the near future.

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