Encoding chemical cues through compartmentalized signal packaging

Signal packaging is a fundamental mechanism that enables cells to manufacture, target, stabilize, and amplify chemical cues. By organizing chemokines, lipid mediators, and guidance factors into glycan lattices, lipid-protein carriers, membrane nanodomains, extracellular vesicles, and other structures, cells transform intrinsically labile chemical cues into long-lived, interpretable instructions. Such packaging maintains gradients in crowded tissues and ensures timely delivery to targeted recipients, thus transforming chemical signals into actively orchestrated and effective programs. Failures in this system contribute to metastasis, chronic inflammation, and barrier dysfunction. In this review, we highlight compartmentalized signal packaging as an evolutionary design principle for cellular communication and discuss how recognizing this information layer provides new insights into the control, engineering, and dysregulation of cellular guidance systems.