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How do interferons and natural killer cells help fight infection?

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Health monitoring — human disease The routine monitoring of blood pressure levels is an important part of assessing an individual's health. Blood pressure provides information about the amount of blood in circulation and about heart function and thus is an important indicator of disease.

Interferons and natural killer (NK) cells are vital components of the body's innate immune system that work together to defend against infections, particularly those caused by viruses.12

Interferons are signaling proteins released by cells in response to viral presence. Their primary functions include:2
* Limiting Replication: They trigger the expression of antiviral genes in neighboring cells, making them resistant to viral infection.32
* Immune Coordination: They act as messengers that activate other immune cells, including macrophages, cytotoxic T cells, and NK cells, to enhance immune surveillance.32

Natural Killer (NK) cells are a type of lymphocyte that provide a rapid, nonspecific defense. They help fight infection by:14
* Targeting Infected Cells: Rather than attacking pathogens directly, NK cells identify and destroy the body’s own cells that have been compromised by a virus or have become cancerous.14
* Cytotoxic Action: Upon recognizing a target, they bind to the cell and release granules containing cytotoxic chemicals into the cytoplasm, causing the infected cell to leak and die.1

Together, these mechanisms ensure that viral spread is contained while simultaneously mobilizing broader immune defenses.2