Issue 15, 2023

Aromatic long chain cations of amphiphilic ionic liquids permeabilise the inner mitochondrial membrane and induce mitochondrial dysfunction at cytotoxic concentrations

Abstract

Understanding the cellular mechanisms by which amphiphilic ionic liquids (AmILs) induce cytotoxicity is an important step in the development of task-specific AmILs for safe industrial applications or as cytotoxic anticancer agents. Accumulated evidence suggests that AmILs kill cells by disrupting cellular membranes and/or inducing mitochondrial dysfunction. The cation of AmILs is lipophilic due to alkyl substitution, and lipophilic cations are a group of compounds known to accumulate in mitochondria in response to the membrane potential across the inner mitochondrial membrane (IMM). We therefore hypothesised that AmILs exert their cytotoxic effects by disrupting the IMM, the integrity of which is critical to several important cellular processes. Using fluorescence microscopy we show that a quinolinium-based AmIL rapidly accumulates in the mitochondria of HeLa cells. In a panel of AmILs we found that cytotoxicity correlates with their capacity to disrupt lipid bilayers, and that AmILs produce a range of cellular effects consistent with permeabilisation of the IMM at cytotoxic concentrations. Thus, AmILs depolarise the IMM, inhibit oxidative phosphorylation and ATP synthesis, and induce ROS formation. These effects were only induced by AmILs with aromatic cations substituted with long (decyl) alkyl chains, as these features promote accumulation in, and permeabilisation of, the IMM. These mechanistic insights help explain the structure–activity relationship governing AmILs cytotoxicity and may be used to rationally design either safe or cytotoxic AmILs.

Graphical abstract: Aromatic long chain cations of amphiphilic ionic liquids permeabilise the inner mitochondrial membrane and induce mitochondrial dysfunction at cytotoxic concentrations

Supplementary files

Article information

Article type
Paper
Submitted
13 Jan 2023
Accepted
10 Jul 2023
First published
14 Jul 2023

Green Chem., 2023,25, 6067-6076

Aromatic long chain cations of amphiphilic ionic liquids permeabilise the inner mitochondrial membrane and induce mitochondrial dysfunction at cytotoxic concentrations

M. Duman, A. Angeloski, M. S. Johnson and T. Rawling, Green Chem., 2023, 25, 6067 DOI: 10.1039/D3GC00151B

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