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Kir6.1, a component of an ATP-sensitive potassium channel, regulates natural killer cell development

Natalie Samper, Lilja Harðardóttir, Delphine M Depierreux

    Biorxiv : the Preprint Server for Biology
    |August 30, 2024
    PubMed

    Insights

    The ATP-sensitive potassium channel subunit Kir6.1 (Kcnj8) is crucial for natural killer (NK) cell development. This study reveals its role in NK cell maturation, offering new avenues for immunotherapy.

    Area of Science:

    • Immunology
    • Cell Biology
    • Ion Channel Physiology

    Background:

    • Natural killer (NK) cells are vital for immunity and reproduction, presenting therapeutic targets for cancer, infections, and pregnancy complications.
    • Current NK cell therapies often use cytokines or antibodies, but ion channel modulators, widely used clinically, remain unexplored for NK cells.
    • The role of ion channels, particularly ATP-sensitive potassium (KATP) channels, in NK cell function is largely unknown.

    Purpose of the Study:

    • To investigate the expression and function of ion channels in NK cells.
    • To determine the specific role of the Kcnj8 gene, encoding the Kir6.1 subunit of KATP channels, in NK cell development and function.

    Main Methods:

    • Quantitative analysis of Kcnj8 gene expression in murine splenic and uterine NK cells.
    • Patch-clamp electrophysiology to identify KATP channel activity in NK cells.
    • In vitro and in vivo assays to assess NK cell degranulation and tumor rejection.
    • Transcriptomic analysis of NK cells with Kcnj8 gene ablation.
    • Generation of NK-cell specific Kcnj8 gene-ablated mice.

    Main Results:

    • Kcnj8 is highly expressed in mature murine splenic (CD27-CD11b+) and educated uterine NK cells (NKG2A+ or Ly49C/I+).
    • A subset of NK cells exhibits a current sensitive to the Kir6.1 blocker PNU-37883A.
    • Kcnj8 deficiency did not affect NK cell degranulation against tumor cells in vitro or tumor rejection in vivo.
    • Kcnj8 ablation in NK cells led to reduced numbers of mature NK cell subsets (CD11b+CD27- and KLRG-1+) in bone marrow and spleen.

    Conclusions:

    • The KATP channel subunit Kir6.1 (Kcnj8) plays a significant role in the development of natural killer cells.
    • Targeting Kir6.1 may offer novel strategies for modulating NK cell populations in therapeutic contexts.
    • Further research into ion channel modulators could unlock new immunotherapeutic approaches.

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