The cytotoxic effect of magainin II on the MDA-MB-231 and M14K tumour cell lines

Our plain-English summary of The cytotoxic effect of magainin II on the MDA-MB-231 and M14K tumour cell lines, by R. Anghel, D. Jitaru, L. Bădescu, et al (BioMed Research International, 2013).

The study

• Authors: R. Anghel, D. Jitaru, L. Bădescu, M. Bădescu, M. Ciocoiu
• Journal: BioMed Research International
• Published: 2013;2013:831709
• Cited by: 16 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

Many studies have highlighted the tumoricidal properties of some natural peptides known to have antimicrobial virtues. Also, the increasingly higher resistance to conventional antibiotics has become a global public health issue, and the need for new antibiotics has stimulated interest in finding and synthesizing new antimicrobial peptides, which may also be used as chemotherapeutic agents. Relying on the literature, the purpose of our in vitro research was to assess the tumoricidal potential of magainin II on a series of tumour cell lines, namely, MDA-MB-231 (breast adenocarcinoma) and M14K (human mesothelioma). The experimental results of our study revealed that the cytotoxic effects of magainin II depend on its concentration. Its efficiency is significant at 120 μM concentrations, and, although it is much lower, it persists even at 60 μM concentrations. The effects were insignificant at 30 μM concentrations. In our experimental research, the tumoricidal effect of magainin II was not significantly dependent on the type of tumour cell line used.

In plain English

This was a laboratory study of cancer cells grown in dishes. It did not involve people or asbestos exposure. The authors tested magainin II, a peptide (a small protein) known for killing microbes, on two human tumour cell lines: MDA-MB-231, from breast adenocarcinoma, and M14K, from mesothelioma. They first used M14K and a leukaemia line, K562, to choose how many cells to put in each test well. Cells were then exposed for 72 hours to magainin II at 0.9 to 120 micromolar. In a test of how much cell growth was halted (cytostasis), 120 micromolar gave 59.44% cytostasis in the breast cancer cells and 53.95% in the mesothelioma cells. At 60 micromolar the figures were 23.54521% and 13.37522%, and no cytostasis was seen at 15 micromolar or below. A second method found that at 120 micromolar, 35.9% of mesothelioma cells were living, compared with 89.6% of untreated cells. The authors concluded that the effect depended mainly on concentration and was not significantly influenced by the cell line.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: in vitro laboratory experiment on tumour cell lines
• Who was studied: Two adherent human tumour cell lines were tested: MDA-MB-231 (breast adenocarcinoma) and M14K (human mesothelioma, described as an epithelial mesothelial line). M14K and K562 (chronic myeloid leukaemia) cells were used to find the optimal number of cells per well.
• Exposure: Magainin II, an antimicrobial peptide, was used at 120, 60, 30, 15, 7.5, 3.5, 1.8 and 0.9 micromolar, with 72 hours of incubation. No asbestos exposure was studied.
• Main results:
  • The optimal working number was 10^5 cells per well in 200 microlitres. In wells with 10^6 cells, mortality was 98.8% after 24 hours. The article prints these as "105" and "106" because the superscripts were lost.
  • In MDA-MB-231 (breast adenocarcinoma) cells, the MTT test gave cytostasis of 59.44% at 120 micromolar, 23.54521% at 60 micromolar and 13.6974% at 30 micromolar. It was negative (-19.9642%) at 15 micromolar.
  • In MDA-MB-231 cells, flow cytometry at 120 micromolar found 1.4% dead, 47.5% in late apoptosis, 36.3% living and 14.8% in early apoptosis. Untreated controls were 90.5% living.
  • In M14K (mesothelioma) cells, the MTT test gave cytostasis of 53.95% at 120 micromolar, 13.37522% at 60 micromolar and 4.48833% at 30 micromolar. It was negative (-3.68043%) at 15 micromolar.
  • In M14K cells, flow cytometry at 120 micromolar found 47.8% in late apoptosis, 13.5% in early apoptosis and 35.9% living. Untreated controls were 89.6% living.
  • The two cell lines responded similarly to the same concentration of magainin II.
• The authors' conclusion: The authors concluded that magainin II's cytotoxic effect depended mainly on concentration. They described it as significant at 120 micromolar, persisting at 60 micromolar and insignificant at 30 micromolar. They also concluded it was not significantly influenced by the tumour cell line.

Topics

Medical terms in this study, explained in our Lexicon: Adenocarcinoma, Mesothelioma.

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