Innate Immunity II-2 - NETosis and Cancer

4 important questions on Innate Immunity II-2 - NETosis and Cancer

What happens in excessive NETosis?

Excessive amounts of dead cell debris get caught in the NETs, can lead to chronic inflammatory state, and continuous recruitment of more neutrophils.

How can NETosis contribute to cancer?

NETs can trap circulating tumour cells and promote their migration, invasion, and colonization, and can create an environment that protects cancer cells from immune system

How can NETosis contribute to cancer METASTASIS?

1. NETs can activate dormant cancer cells and promote epithelial-mesenchymal transition (EMT)

2. Circulating tumor cells (CTCs) can become trapped within circulating NETs and protected from immune cells, they are exposed to high levels of local neutrophil elastase, and other factors that support proliferation

3. NETs can prepare metastatic tumor sites by inhibiting immune surveillance by T cells and NK cells, releasing MMP-9 and serine proteases that promote angiogenesis via VEGF, modulating the extracellular matrix (ECM) to favor cancer growth, and recruiting inflammatory cytokines that attract even more neutrophils
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How can we stop NETosis during cancer?

Antibodies against TNF-alpha: blocks the process of inflammation and recruitment of other inflammatory cytokines

Antibodies against TGF beta: activates the immune system and reduce fibrosis + and blocks the activation of N2 (pro-tumor neutrophils)

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