MicroRNAs-103/107 coordinately regulate macropinocytosis and autophagy

Jong Kook Park, Han Peng, Julia Katsnelson, Wending Yang, Nihal Kaplan, Ying Dong, Joshua Z. Rappoport, Cong Cong He, Robert M. Lavker*

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Macropinocytosis, by which cells ingest large amounts of fluid, and autophagy, the lysosome-based catabolic process, involve vesicular biogenesis (early stage) and turnover (end stage). Much is known about early-stage events; however, our understanding of how the end stages of these processes are governed is incomplete. Here we demonstrate that the microRNA-103/107(miR-103/107) family, which is preferentially expressed in the stem cell-enriched limbal epithelium, coordinately regulates aspects of both these activities. Loss of miR-103/107 causes dysregulation of macropinocytosis with the formation of large vacuoles, primarily through up-regulation of Src, Ras, and Ankfy1. Vacuole accumulation is not a malfunction of early-stage autophagy; rather, miR-103/107 ensure proper end-stage autophagy by regulating diacylglycerol/protein kinase C and cyclin-dependent kinase 5 signaling, which enables dynamin to function in vacuole clearance. Our findings unveil a key biological function for miR-103/107 in coordinately suppressing macropinocytosis and preserving end-stage autophagy, thereby contributing to maintenance of a stem cell-enriched epithelium.

Original languageEnglish (US)
Pages (from-to)667-685
Number of pages19
JournalJournal of Cell Biology
Volume215
Issue number5
DOIs
StatePublished - Jan 1 2016

ASJC Scopus subject areas

  • Cell Biology

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