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Another piece in the progranulin puzzle: special binding between progranulin and prosaposin creates additional lysosomal access: An Editorial Comment for 'The interaction between progranulin and prosaposin is mediated by granulins and the linker region between saposin B and C' on page 236.
Journal of Neurochemistry 2017 October
Loss-of-function mutations in the gene encoding the growth factor progranulin cause degeneration of the ageing brain in a dose-dependent manner. While heterozygous mutations result in adult onset frontotemporal dementia, the much rarer homozygous null mutations cause an early onset lysosomal storage disorder. A better understanding of the biology of progranulin in the central nervous system is needed to find solutions for these incurable diseases. This Editorial highlights a study by Zhou et al. in the current issue of the Journal of Neurochemistry, in which the authors provide data that are a step towards this goal. Progranulin is mainly expressed by neurons and microglia and, although it is a secreted protein, it also ends up in lysosomes. Recently, the trafficking of progranulin and the molecular players involved have become better understood. A special interaction between progranulin and its travelling companion, prosaposin, explains how both proteins can use each other's transport receptors to gain access to lysosomes.
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