Mechanical interactions impact the functions of immune cells and their application in immunoengineering

Immune cells experience a wide range of modes and magnitudes of mechanical forces as they infiltrate tissues and physically interact with other cells. Biophysical forces influence cell phenotypes through mechanosensing of the cytoskeleton, cell adhesion, catch and slip bonds, and mechanically gated ion channels. As a result, different mechanical environments impact the function and expression of immune cell receptors, which subsequently affects local and systemic immune responses. Mechanical coupling of immune cell receptors can be exploited in immuno-engineering applications such as adoptive cell transfer and artificial antigen-presenting cells through biomaterial systems with tunable mechanical properties that regulate receptor expression and cell activation. This review covers immune cell receptors in the adaptive and innate immune system that respond to mechanical forces and their potential to be applied for advancing current immunotherapies.