CAR Therapies: Ex Vivo and In Vivo Potential of Exosomes and Biomimetic Nanoparticles.

Chimeric antigen receptor (CAR) therapy represents a promising modality for treating cancer and autoimmune diseases, employing genetically engineered immune cells. Despite remarkable clinical outcomes, its broad implementation is constrained by significant challenges, including toxicity, limited specificity, and complexities associated with genetic material delivery. Biological nanoparticles, such as exosomes, virus-like particles, and biomimetic nanostructures, possess unique properties that can address these limitations. These nanoplatforms enable targeted delivery of genetic constructs, mitigate the risk of cytokine release syndrome, modulate CAR cell activity, and can function as biosensors. Furthermore, they facilitate non-viral, in vivo CAR cell engineering, streamlining the process compared to conventional ex vivo methods. The advancement of in vivo strategies underscores the critical need to overcome toxicity hurdles inherent to current CAR-T platforms. In this context, exosomes and biomimetic nanoparticles offer considerable potential due to their innate biocompatibility, programmability, and versatile cargo capacity for payloads like mRNA and circular RNA. This review comprehensively outlines contemporary genetic platforms for CAR expression and examines the opportunities presented by biological delivery vehicles. It focuses on recent achievements and revisits fundamental CAR principles through the lens of emerging technologies aimed at confronting persistent challenges in the field.