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Boonen, Marielle; Staudt, Catherine; Gilis, Florentine; Oorschot, Viola; Klumperman, Judith; Jadot, Michel
Journal of cell science, 02/2016, Letnik: 129, Številka: 3Journal Article
How, in the absence of a functional mannose 6-phosphate (Man-6-P)-signal-dependent transport pathway, some acid hydrolases remain sorted to endolysosomes in the brain is poorly understood. We demonstrate that cathepsin D binds to mouse SEZ6L2, a type 1 transmembrane protein predominantly expressed in the brain. Studies of the subcellular trafficking of SEZ6L2, and its silencing in a mouse neuroblastoma cell line reveal that SEZ6L2 is involved in the trafficking of cathepsin D to endosomes. Moreover, SEZ6L2 can partially correct the cathepsin D hypersecretion resulting from the knockdown of UDP-GlcNAc:lysosomal enzyme GlcNAc-1-phosphotransferase in HeLa cells (i.e. in cells that are unable to synthesize Man-6-P signals). Interestingly, cleavage of SEZ6L2 by cathepsin D generates an N-terminal soluble fragment that induces neurite outgrowth, whereas its membrane counterpart prevents this. Taken together, our findings highlight that SEZ6L2 can serve as receptor to mediate the sorting of cathepsin D to endosomes, and suggest that proteolytic cleavage of SEZ6L2 by cathepsin D modulates neuronal differentiation.
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