Chaperone-mediated autophagy (CMA) characterized by the selective degradation of target proteins has been linked with tumorigenesis in recent years. Here, we explored the function of sorting nexin 10 (SNX10), a protein involved in maintaining endosome/lysosome homeostasis, in mediating CMA activity and its impact on the progression of mouse colorectal cancer. Our results revealed that SNX10 deficiency increased the activation of CMA by preventing the degradation of lysosomal LAMP-2A. In SNX10 KO cells, we disclosed that p21Cip1/WAF1, a master effector in various tumor suppressor pathways, is a substrate of CMA, and decrease of p21Cip1/WAF1 caused by SNX10-mediated CMA activation contributes to HCT116 cell proliferation and survival.
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