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Myconoside interacts with the plasma membranes and the actin cytoskeleton and provokes cytotoxicity in human lung adenocarcinoma A549 cells

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Abstract

Studies have been carried out on the effects of the phenyl glycoside myconoside, extracted from the relict, Balkan endemic resurrection plant Haberlea rhodopensis on the plasma membrane structural organization and the actin cytoskeleton. Because the plasma membrane is the first target of exogenous bioactive compounds, we focused our attention on the influence of myconoside on the membrane lipid order and actin cytoskeleton in human lung adenocarcinoma A549 cells, using fluorescent spectroscopy and microscopy techniques. We found that low myconoside concentration (5 μg/ml) did not change cell viability but was able to increase plasma membrane lipid order of the treated cells. Higher myconoside concentration (20 μg/ml) inhibited cell viability by decreasing plasma membrane lipid order and impairing actin cytoskeleton. We hypothesize that the observed changes in the plasma membrane structural organization and the actin cytoskeleton are functionally connected to cell viability. Biomimetic membranes were used to demonstrate that myconoside is able to reorganize the membrane lipids by changing the fraction of sphingomyelin-cholesterol enriched domains. Thus, we propose a putative mechanism of action of myconoside on A549 cells plasma membrane lipids as well as on actin filaments in order to explain its cytotoxic effect at high myconoside concentration.

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Data are available from the corresponding author upon reasonable request and deposited on the institution website of the corresponding authors (http://biomed.bas.bg/bg/).

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Acknowledgments

This study was financially supported from the National Science Fund of Bulgaria by Grant DN 18/15/2017 (Model membrane experiments). The authors thank the Bulgarian Ministry of Education and Science for support: Scientific Infrastructure on Cell Technologies in Biomedicine (SICTB) DO1-154/28/08/2018 (Cell culture technologies) and D01-392/2020 “National Center for Biomedical Photonics”, part of Bulgarian National Roadmap for Scientific Infrastructures 2020-2027 (Imaging platform). The authors also acknowledged COST Action 17 121: Correlated Multimodal Imaging in Life Sciences-COMULIS by grant KP-06-COST/10/2020 (Fluorescent probes).

Funding

This study was financially supported from the National Science Fund of Bulgaria by Grant DN 18/15/2017.

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Correspondence to Rusina Hazarosova or Galya Staneva.

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The cell lines used in this study were purchased from the American Type Culture Collection—ATCC (Manassas, VA, USA).

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The authors declare no conflict of interest.

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Kostadinova, A., Hazarosova, R., Topouzova-Hristova, T. et al. Myconoside interacts with the plasma membranes and the actin cytoskeleton and provokes cytotoxicity in human lung adenocarcinoma A549 cells. J Bioenerg Biomembr 54, 31–43 (2022). https://doi.org/10.1007/s10863-021-09928-x

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  • DOI: https://doi.org/10.1007/s10863-021-09928-x

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