Super-resolution imaging reveals altered actin architecture at CAR-T cell immune synapses.

Super-resolution imaging shows that CAR-T cells have altered actin structures at immune synapses, with 40% fewer actin foci and persistent microvilli-like protrusions.

• Why it matters: Understanding actin remodeling is crucial for improving CAR-T cell function, as defective cytoskeletal dynamics may cause unstable synapses and abnormal responses, limiting therapy effectiveness.
• What they did: Using STED microscopy, the study analyzed actin architecture in single- and dual-specificity CAR-T cells activated on supported lipid bilayers, across multiple time points, revealing structural differences.
• The result: Findings suggest impaired actin network reorganization in CAR-T cells, which may lead to suboptimal synapse maturation and signaling, informing strategies to enhance CAR-T safety and efficacy.