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Updated: May 20, 2025

Quantification of Efferocytosis by Single-cell Fluorescence Microscopy
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Rapid ER remodeling induced by a peptide-lipid complex in dying tumor cells

Samudra Sabari1, Siddharth Chinchankar1, Ines Ambite1

  • 1Division of Microbiology, Immunology and Glycobiology, Department of Laboratory Medicine, Lund University, Lund, Sweden.

Life Science Alliance
|March 25, 2025
PubMed

Insights

A novel tumoricidal complex, alpha1-oleate, triggers a unique endoplasmic reticulum (ER) response. This response involves ER vesiculation and nuclear uptake, potentially sequestering cellular contents in dying tumor cells.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The endoplasmic reticulum (ER) is a vital organelle for protein and lipid biosynthesis, cellular communication, and molecule transport.
  • Therapeutic agents can be delivered via the ER network.

Purpose of the Study:

  • To identify and characterize a novel ER response to the tumoricidal complex alpha1-oleate.
  • To investigate the mechanism and implications of this ER response in dying tumor cells.

Main Methods:

  • Microscopy and biochemical assays were used to analyze ER structure and protein localization.
  • Investigated the uptake and distribution of alpha1-oleate within cells and nuclei.
  • Examined changes in nuclear morphology and composition.

Main Results:

  • Alpha1-oleate induced loss of peripheral ER structure and extensive ER vesiculation.
  • ER-derived vesicles contained alpha1-oleate, ER-resident proteins (calnexin, ORP3), and KDEL.
  • Nuclear uptake of alpha1-oleate led to ER-lined nuclear invaginations and a volcano-like nuclear shape.

Conclusions:

  • A novel ER response to alpha1-oleate involves vesiculation and nuclear sequestration of cellular contents.
  • This ER response may serve to package cellular debris in the nuclei of dying tumor cells.
  • The findings offer insights into cellular responses to tumoricidal agents and cell death mechanisms.

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