Natural Killer Cells Detect a Tumor-Produced Growth Factor: A Vestige of Antiviral Resistance?

Trends in Immunology
Giorgio Trinchieri

Abstract

In addition to exogenous ligands derived from pathogens, natural killer (NK) and other innate cells can recognize endogenous ligands that often act as markers of stress or damage. A recent study reports that one of these receptors, human NKp44, recognizes PDGF-DD, providing a rare example of the recognition of a soluble growth factor as a stress signal. The recognition of PDGF-DD induces the secretion of cytokines with antitumor activity.

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