Abstract
Irreversible electroporation (IRE) is primarily a nonthermal ablative technology that uses a series of high-voltage and ultra-short pulses with high-frequency electrical energy to induce cell death. This paper presents the influence of cholesterol on the IRE-induced probability of pore formation and the rate constant of pore formation in giant unilamellar vesicles (GUVs). The GUVs are prepared by a mixture of dioleoylphosphatidylglycerol (DOPG), dioleoylphosphatidylcholine (DOPC) and cholesterol using the natural swelling method. An IRE signal of frequency 1.1 kHz is applied to the membranes of GUVs. The probability of pore formation and the rate constant of pore formation events are obtained using statistical analysis from several single GUVs. The time-dependent fraction of intact GUVs among all those examined is fitted to a single exponential decay function from where the rate constant of pore formation is calculated. The probability of pore formation and the rate constant of pore formation decreases with an increase in cholesterol content in the membranes of GUVs. Theoretical equations are fitted to the tension-dependent rate constant of pore formation and to the probability of pore formation, which allows us to obtain the line tension of membranes. The obtained line tension increases with an increase in cholesterol in the membranes. The increase in the energy barrier of the prepore state, due to the increase of cholesterol in membranes, is the main factor explaining the decrease in the rate constant of pore formation.
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Acknowledgements
This work was supported partly by the Grants from Ministry of Science and Technology (39.00.0000.009.06.024.19-12), ICT Division (56.00.0000.028.33.105.18-05) (Ministry of Posts, Telecommunications and Information Technology), Ministry of Education (37.20.0000.004.033.020.2016) and CASR-BUET of Bangladesh to Mohammad Abu Sayem Karal.
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Karal, M.A.S., Ahamed, M.K., Mokta, N.A. et al. Influence of cholesterol on electroporation in lipid membranes of giant vesicles. Eur Biophys J 49, 361–370 (2020). https://doi.org/10.1007/s00249-020-01443-y
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DOI: https://doi.org/10.1007/s00249-020-01443-y