[Antimicrobial activity of NK cells]

Area of Science:

• Immunology
• Microbiology
• Cellular Biology

Background:

• Natural killer (NK) lymphocytes were initially characterized by their cytotoxic and cytolytic functions against tumor cells.
• Emerging research highlights NK cells as key mediators of innate resistance against a spectrum of pathogens, including viruses, fungi, protozoa, and bacteria.

Purpose of the Study:

• To consolidate and review existing data on the antimicrobial activities mediated by NK cells.
• To examine the impact of corticosteroids and other relevant molecules on innate resistance mechanisms against pathogenic microorganisms.

Main Methods:

• Literature review and data synthesis.
• Analysis of studies investigating NK cell interactions with various pathogens.
• Evaluation of molecular mechanisms influencing NK cell-mediated antimicrobial responses.

Main Results:

• NK cells exhibit direct and indirect antimicrobial effects against a wide range of pathogens.
• Corticosteroids and other immunomodulatory molecules can significantly influence NK cell function and their contribution to innate immunity.
• NK cell activity is crucial for early-phase host defense against microbial infections.

Conclusions:

• NK cells play a multifaceted role in host defense, extending beyond tumor surveillance to encompass significant antimicrobial functions.
• Understanding the modulation of NK cell activity by external factors is critical for developing novel strategies to combat infectious diseases.
• Further research into NK cell-pathogen interactions will illuminate new therapeutic targets for infectious diseases.