Bacterial pathogenesis - Methods of Bacterial pathogenesis management - Barriers, innate, and adaptive immunity

4 important questions on Bacterial pathogenesis - Methods of Bacterial pathogenesis management - Barriers, innate, and adaptive immunity

How do physical barriers react with bacteria?

Antibacterial molecules in the mucus (e.g. Antimicrobial peptides) kill bacteria by disrupting their cell membranes

How does the innate immunity react to bacteria?

Recognition: Immune cells (e.g. Macrophages and DCs) recognize PAMPs through Pattern Recognition Receptors (e.g. TLRs, NLRs)

Inflammation: Triggers the release of cytokines that attract neutrophils and cause vasodilation, leading to swelling and recruitment

Phagocytosis and NETs: Neutrophils engulf bacteria through phagocytosis or form NETs made of DNAs to trap bacteria

How does the adaptive immunity react to bacteria?

Antigen presentation: DCs present bacterial antigens to T cells within lymph nodes

Cellular & humoral immunity: CD4+ cells, CD8+ cells and B cells work together to produce a specific and targeted immune response

Memory: Memory B and T cells are generated to enable faster responses in the future encounters
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How do neutrophils fight back against bacteria

1. Phagocytosis: eating the bacteria, eating, chopping it off
2. Degranulation: release of compounds that are toxic to bacteria to kill them
3. NETosis: forming a net from DNA, trap the bacteria and cannot move anywhere else - acting like glue

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