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CMA regulates the abundance of many disease-related proteins, with causative roles in neoplasia, neurodegeneration, hepatosteatosis, and other pathologies relevant to human health and aging. At the lysosomal membrane, CMA is inhibited by Akt-dependent phosphorylation of the CMA regulator GFAP. The INS-PI3K-PDPK1 pathway regulates Akt, but its role in CMA is unclear. Here, we report that inhibition of class I PI3K or PDPK1 activates CMA. In contrast, selective inhibition of class III PI3Ks does not activate CMA. Isolated liver lysosomes from mice treated with either of two orally bioavailable class I PI3K inhibitors, pictilisib or buparlisib, display elevated CMA activity, and decreased phosphorylation of lysosomal GFAP, with no change in macroautophagy. The findings of this study represent an important first step in repurposing class I PI3K inhibitors to modulate CMA in vivo.<\/jats:p>","DOI":"10.1083\/jcb.202001031","type":"journal-article","created":{"date-parts":[[2020,10,13]],"date-time":"2020-10-13T19:32:27Z","timestamp":1602617547000},"update-policy":"https:\/\/doi.org\/10.1083\/jcb.crossmarkpolicy","source":"Crossref","is-referenced-by-count":43,"title":["Inhibition of class I PI3K enhances chaperone-mediated autophagy"],"prefix":"10.1083","volume":"219","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8237-9784","authenticated-orcid":true,"given":"S. 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