Extracellular vesicles in the host-helminth communication: biomedical applications

Extracellular vesicles participate in intercellular communications, altogether with classic mechanisms like direct contact between cells and the secretion of mediators. They have attracted considerable interest since their discovery in reticulocytes in 1983. The term includes different types of vesicles that vary in size and origin, with exosomes, microvesicles and apoptotic bodies as the major ones. These structures are sorrounded by a lipid membrane, where various types of receptors are located, and can carry different cargo molecules, including sugars, proteins, nucleic acids and metabolites. They have been described in all kingdoms in nature (participating in both intercellular and inter-specific communications), in all types of biological fluids (as part of liquid biopsy). In fact, their presence in samples from both physiological and pathological processes has suggested them as excellent biomarkers. Their role in health and disease is being widely investigated. In this context, the study of extracellular vesicles produced by parasites, and specifically by helminths, constitutes a growing field of research, with great biomedical interest, mainly in the control of infections caused by them. In fact, these vesicles can be used to generate rapid and specific diagnosis systems, to produce new tools for vaccination, and to identify targets for new treatments. The ability of extracellular vesicles to modulate the immune response also opens new possibilities for their use against autoimmune diseases.