Researchers Describe a Novel Mechanism Inducing Self-Killing of Cancer Cells

Scientist holds and examine samples

Researchers from the Department of Biochemical Engineering at Korea Advanced Institute of Science and Technology (KAIST) described a new mechanism which induces the self-killing of cancer cells by perturbing ion homeostasis.

Professor Yeu-Chun Kim (left) and lead author Dae-Yong Lee, Ph.D.

As part of the study, funded by the National Research Foundation, the research team developed helical polypeptide potassium ionophores that lead to the onset of Apoptosis or programmed cell death.

The ionophores increase the active oxygen concentration to stress endoplasmic reticulum to the point of cellular death.

The electrochemical gradient between extracellular and intracellular conditions plays an important role in cell growth and metabolism. When a cell’s ion homeostasis is disturbed, critical functions accelerating the activation of apoptosis are inhibited in the cell.

Unclear mechanism
Although ionophores have been intensively used as an ion homeostasis disturber, the mechanisms of cell death have been unclear and the bio-applicability has been limited. In the study featured at Advanced Science, the team presented an alpha helical peptide-based anticancer agent that is capable of transporting potassium ions with water solubility. The cationic, hydrophilic, and potassium ionic groups were combined at the end of the peptide side chain to provide both ion transport and hydrophilic properties.

A Helical Polypeptide‐Based Potassium Ionophore Induces Endoplasmic Reticulum Stress‐Mediated Apoptosis by Perturbing Ion Homeostasis | Advanced Science, Volume: 6, Issue: 14, First published: 24 May 2019, DOI: (10.1002/advs.201801995)

These peptide-based ionophores reduce the intracellular potassium concentration and at the same time increase the intracellular calcium concentration. Increased intracellular calcium concentrations produce intracellular reactive oxygen species, causing endoplasmic reticulum stress, and ultimately leading to apoptosis.

Anticancer effects were evaluated using tumor-bearing mice to confirm the therapeutic effect, even in animal models. It was found that tumor growth was strongly inhibited by endoplasmic stress-mediated apoptosis.

“A peptide-based ionophore is more effective than conventional chemotherapeutic agents because it induces apoptosis via elevated reactive oxygen species levels,” noted lead author Dae-Yong Lee, Ph.D.

“I expects this new mechanism will be widely used as a new chemotherapeutic strategy,” Professor Yeu-Chun Kim concluded.

Reference
Lee D, Lee SH, Noh I, Oh E, Ryu H, Ha J, Jeong S, et al. A Helical Polypeptide-Based Potassium Ionophore Induces Endoplasmic Reticulum Stress-Mediated Apoptosis by Perturbing Ion Homeostasis. Adv Sci (Weinh). 2019 May 24;6(14):1801995. doi: 10.1002/advs.201801995. eCollection 2019 Jul 17.[Pubmed][Article]