Targeting NK cell immunosenescence in cancer: Mechanisms, impact, and therapeutic opportunities
TL;DR
Targeting the biological hallmarks of NK cell immunosenescence represents a significant frontier in geriatric oncology offering the potential to resuscitate anti-tumor immunity for the burgeoning elderly population.
Abstract
Aging remains the primary risk factor for malignancy, driven primarily by the progressive decline of the immune system known as immunosenescence. Natural killer (NK) cells serve as the critical effectors of tumor immunosurveillance, yet their anti-tumor efficacy is compromised during biological aging. This review delineates the multifaceted mechanisms of NK cell immunosenescence including phenotypic subset redistribution, receptor signaling dysregulation, and metabolic biogenesis failure driven by mitochondrial impairment alongside telomere attrition and p16 p21 mediated cell cycle arrest. These cell intrinsic defects interact with the suppressive aging microenvironment to create a self-reinforcing vicious cycle that facilitates tumor escape in the elderly population. Breaking this cycle necessitates a multi-dimensional therapeutic framework that integrates cellular rejuvenation via induced pluripotent stem cell (iPSC) derived chimeric antigen receptor (CAR) NK cells with niche remodeling using senolytics or bone marrow rejuvenation. Ultimately targeting the biological hallmarks of NK cell immunosenescence represents a significant frontier in geriatric oncology offering the potential to resuscitate anti-tumor immunity for the burgeoning elderly population.