Abstract
Extracellular vesicles (EVs) are signaling organelles that are released by many cell types and is highly conserved in both prokaryotes and eukaryotes. Based on the mechanism of biogenesis, these membranous vesicles can be classified as exosomes, shedding microvesicles, and apoptotic blebs. It is becoming clearer that these EVs mediate signal transduction in both autocrine and paracrine fashion by the transfer of proteins and RNA. While the role of EVs including exosomes in pathogenesis is well established, very little is known about their function in normal physiological conditions. Recent evidences allude that EVs can mediate both protective and pathogenic effects depending on the precise state. In this review, we discuss the involvement of EVs as mediators of signal transduction in neurodegenerative diseases and cancer. In addition, the role of EVs in mediating Wnt and PI3K signaling pathways is also discussed. Additional findings on the involvement of EVs in homeostasis and disease progression will promote a better biological understanding, advance future therapeutic, and diagnostic applications.
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