Mechanosensation and Mechanotransduction in Natural Killer Cells

Area of Science:

• Immunology
• Cell Biology
• Biophysics

Background:

• Natural killer (NK) cells are crucial innate immune lymphocytes that eliminate virally infected cells and tumors.
• NK cell activity is regulated by a balance of activating and inhibitory receptors and adhesive interactions.
• Mechanotransduction, the conversion of physical forces into cellular signals, is increasingly recognized as vital in cell function.

Purpose of the Study:

• To investigate the role of mechanotransduction, primarily mediated by the actin cytoskeleton, in regulating NK cell functions.
• To elucidate how physical forces influence NK cell adhesion, migration, tissue infiltration, and effector functions.

Main Methods:

• Analysis of the actin cytoskeleton's role in NK cell immunological synapse (NKIS) formation and polarization.
• Investigation of actin retrograde flow (ARF) dynamics during activating and inhibitory NKIS.
• Examination of cellular structures like uropods and membrane nanotubes involved in NK cell interactions.

Main Results:

• The actin cytoskeleton is fundamental for NKIS formation, secretory apparatus polarization, and adhesion.
• Actin retrograde flow (ARF) dynamics differ between activating (rapid lamellipodial ARF) and inhibitory (slower centripetal flow) NKIS.
• Specific actin dynamics, including β-actin association with SHP-1 in inhibitory synapses, control NK cell activation versus inhibition balance.

Conclusions:

• Mechanotransduction, through actin cytoskeleton regulation, significantly impacts NK cell adhesion, migration, and immune functions.
• Understanding these mechanobiological processes is essential for advancing NK cell-based immunotherapies.
• Future development of tailored nanomaterials could bridge *in vitro* findings with *in vivo* therapeutic applications for NK cells.