[Natural killer cells--important in the immunologic defense].

Area of Science:

• Immunology
• Cell Biology

Context:

• Natural Killer (NK) cells are lymphocytes distinct from T and B cells.
• NK cells play crucial roles in innate immunity.
• They are found in various tissues including blood, spleen, liver, and lungs.

Purpose:

• To elucidate the distinct mechanisms by which NK cells discriminate between self and non-self.
• To review the established and potential roles of NK cells in antimicrobial and antitumor defense.
• To present a case study of a patient with NK cell deficiency and recurrent viral infections.

Summary:

• NK cells possess unique receptors that recognize altered MHC class I determinants, enabling self-non-self discrimination differently than T cells.
• Their involvement in combating herpesviruses is well-documented, and a case report highlights the consequences of NK cell defects.
• NK cells demonstrate potential in cancer immunosurveillance, with receptors identified that target tumor cells for destruction in vitro.

Impact:

• Provides insights into the fundamental mechanisms of innate immunity mediated by NK cells.
• Highlights the therapeutic potential of NK cells in managing viral infections and cancers.
• Contributes to understanding immunodeficiency disorders related to NK cell function.