Abstract
Exosomes are small vesicles, secreted by eukaryotic cells, containing molecular cargo that reflects the biochemical composition of the origin cell, including protein and RNA. Once secreted, exosomes can enter the circulatory system and be found in blood, urine, and saliva. It has been hypothesized that because exosomes contain transmembrane proteins unique to their cell of origin, specific populations of exosomes could be non-invasively extracted from the bloodstream. The protein L1CAM may serve as a marker of neuronal exosomes. However, although “neuron-derived-exosomes'' could offer some specific information about in-vivo molecular neurobiology, this population of exosomes still provides a relatively noisy signal, including data on protein expression from a variety of different neuronal subpopulations. We argue that it may be possible to isolate brain-region-specific exosomes, and that data derived from these exosomes would provide a superior diagnostic tool.
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