Mutant p53 amplifies a dynamin-1/APPL1 endosome feedback loop that regulates recycling and migration

Ashley M. Lakoduk, Philippe Roudot, Marcel Mettlen, Heather M. Grossman, Sandra L. Schmid, Ping Hung Chen

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Multiple mechanisms contribute to cancer cell progression and metastatic activity, including changes in endocytic trafficking and signaling of cell surface receptors downstream of gain-of-function (GOF) mutant p53. We report that dynamin-1 (Dyn1) is up-regulated at both the mRNA and protein levels in a manner dependent on expression of GOF mutant p53. Dyn1 is required for the recruitment and accumulation of the signaling scaffold, APPL1, to a spatially localized subpopulation of endosomes at the cell perimeter. We developed new tools to quantify peripherally localized early endosomes and measure the rapid recycling of integrins. We report that these perimeter APPL1 endosomes modulate Akt signaling and activate Dyn1 to create a positive feedback loop required for rapid recycling of EGFR and β1 integrins, increased focal adhesion turnover, and cell migration. Thus, Dyn1- and Akt-dependent perimeter APPL1 endosomes function as a nexus that integrates signaling and receptor trafficking, which can be co-opted and amplified in mutant p53-driven cancer cells to increase migration and invasion.

Original languageEnglish (US)
Pages (from-to)1928-1942
Number of pages15
JournalThe Journal of cell biology
Issue number6
StatePublished - Jun 3 2019

ASJC Scopus subject areas

  • Cell Biology


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