IMMUNOLOGY2026™ Conference Recordings For Attendees-Elucidation of human natural killer cell development

Video Transcription

Video Summary

The speaker discussed human NK cell development, emphasizing the remarkable diversity of NK cells and the importance of killer immunoglobulin-like receptors (KIRs) in recognizing “missing self” on abnormal cells. He reviewed evidence that NK cells may develop in secondary lymphoid tissues, not just bone marrow, and presented a working developmental model in which progenitors progress through defined stages before becoming mature, cytotoxic NK cells.  <br /><br />A major finding was that KIR acquisition appears to occur at a specific developmental window, around the CD56 bright/stage 4B transition. In vitro experiments showed that continuous early exposure to IL-15 unexpectedly suppressed KIR acquisition and functional maturation, while delaying IL-15 exposure allowed stronger KIR expression, better interferon-gamma production, and improved killing. Blocking IL-15 early or inhibiting mTOR with rapamycin restored KIR acquisition.  <br /><br />The speaker connected this to clinical settings, especially stem cell transplantation, where elevated IL-15 after transplant may contribute to delayed NK maturation. The talk highlighted potential implications for improving NK-based therapies by better controlling cytokine timing and signaling. The discussion ended with broader questions about tissue-specific NK development, cytokine context, and how to optimize NK cell differentiation for immunotherapy.

Meta Tag

Date April 17, 2026 12:45 PM - 2:15 PM

Room 151

Session Novel Insights into Innate Lymphocyte Research: Challenges and Opportunities Across Human Health and Disease, Sponsored by NCI, NIH

Speaker Aharon Freud

Track Innate Immune Responses and Host Defense: Molecular Mechanisms (INM)

Year 2026

Keywords

NK cell development

KIR receptors

IL-15 signaling

mTOR inhibition

CD56 bright cells

secondary lymphoid tissues

stem cell transplantation

NK immunotherapy

April 17, 2026 12:45 PM - 2:15 PM

151

Novel Insights into Innate Lymphocyte Research: Challenges and Opportunities Across Human Health and Disease, Sponsored by NCI, NIH

Aharon Freud

Innate Immune Responses and Host Defense: Molecular Mechanisms (INM)

2026