Recruitment of LC3 to damaged Golgi apparatus

Cell Death Differ. 2019 Aug;26(8):1467-1484. doi: 10.1038/s41418-018-0221-5. Epub 2018 Oct 22.

Abstract

LC3 is a protein that can associate with autophagosomes, autolysosomes, and phagosomes. Here, we show that LC3 can also redistribute toward the damaged Golgi apparatus where it clusters with SQSTM1/p62 and lysosomes. This organelle-specific relocation, which did not involve the generation of double-membraned autophagosomes, could be observed after Golgi damage was induced by various strategies, namely (i) laser-induced localized cellular damage, (ii) local expression of peroxidase and exposure to peroxide and diaminobenzidine, (iii) treatment with the Golgi-tropic photosensitizer redaporfin and light, (iv) or exposure to the Golgi-tropic anticancer peptidomimetic LTX-401. Mechanistic exploration led to the conclusion that both reactive oxygen species-dependent and -independent Golgi damage induces a similar phenotype that depended on ATG5 yet did not depend on phosphatidylinositol-3-kinase catalytic subunit type 3 and Beclin-1. Interestingly, knockout of ATG5 sensitized cells to Golgi damage-induced cell death, suggesting that the pathway culminating in the relocation of LC3 to the damaged Golgi may have a cytoprotective function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / pharmacology
  • Cell Death / drug effects
  • Golgi Apparatus / drug effects
  • Golgi Apparatus / metabolism*
  • Green Fluorescent Proteins / metabolism
  • HeLa Cells
  • Humans
  • Microtubule-Associated Proteins / metabolism*
  • Tumor Cells, Cultured
  • beta-Alanine / analogs & derivatives
  • beta-Alanine / pharmacology

Substances

  • Antineoplastic Agents
  • LTX-401
  • MAP1LC3A protein, human
  • Microtubule-Associated Proteins
  • beta-Alanine
  • Green Fluorescent Proteins