Accumulating evidence suggests that progranulin is essential for proper lysosomal function. Progranulin is a lysosomal resident protein and sortilin has been demonstrated to be the lysosomal trafficking receptor for progranulin. Here we describe the methods used to study the interaction between progranulin and sortilin, as well as the critical role of sortilin in mediating the lysosomal delivery of progranulin.
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