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How can silica dust or splinters cause chronic inflammation?

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Pathways of complement activation — inflammation The main function of complement proteins is to aid in the destruction of pathogens by piercing their outer membranes (cell lysis) or by making them more attractive to phagocytic cells such as macrophages (a process known as opsonization). Some complement components also promote inflammation by stimulating cells to release histamine and by attracting phagocytic cells to the site of infection.

Silica dust and splinters cause chronic inflammation because they are foreign materials that the body cannot eliminate through phagocytosis or enzymatic breakdown.1

When these substances enter the body, macrophages—the white blood cells responsible for engulfing foreign particles—attempt to clear them. However, because these materials are indigestible, the macrophages are often killed in the process. The accumulation of these dead cells and the persistent presence of the foreign agent trigger a continuous, long-term inflammatory response.123

In the case of inhaled silica, this process leads to the formation of fibrous tissue nodules that can cause significant lung damage and fibrosis. Because the body cannot remove the irritant, the inflammatory cycle persists, leading to chronic tissue damage and functional impairment. This highlights the importance of protective measures in environments where exposure to such materials is a risk.3412