In vitro effects of recombinant human interferon gamma on human mesothelioma cell lines

Our plain-English summary of In vitro effects of recombinant human interferon gamma on human mesothelioma cell lines, by L. Zeng, A. Buard, I. Monnet, et al (International Journal of Cancer, 1993).

The study

• Authors: L. Zeng, A. Buard, I. Monnet, C. Boutin, J. Fleury, L. Saint-Etienne, P. Brochard, J. Bignon, M.C. Jaurand
• Journal: International Journal of Cancer
• Published: 1993;55(3):515-20
• Cited by: 30 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Malignant mesothelioma is a tumor arising from serous surfaces and often related to asbestos exposure. Malignant mesothelioma is resistant to various forms of therapy. Radiotherapy, surgery or chemotherapy only slightly improve prognosis. IFN-gamma produces complete or partial responses in stage-I patients with malignant mesothelioma. The in vitro biological effect of IFN-gamma on malignant mesothelioma cells remains poorly elucidated. In the present study, 32 well-characterized human mesothelioma cell lines (HMCL) were treated with r-hu IFN-gamma at 4 doses and cell growth was determined by a colorimetric method (MTT assay). Among the 32 HMCLs tested, II exhibited significant cell-growth inhibition; 16 were insensitive to r-hu IFN-gamma, and 5 were slightly inhibited. The sensitive cell lines were strongly inhibited by r-hu IFN-gamma. Our results show that HMCL exhibit a large range of responses to r-hu IFN-gamma, some of which can be compared with those obtained in vivo in humans.

In plain English

In this laboratory study, the authors tested recombinant human interferon gamma on 32 mesothelioma cell lines grown from 22 patients, two of whom had peritoneal mesothelioma. The patients' clinical details were tabulated, but the study was not a treatment trial and did not analyze asbestos exposure. Cells were treated with 10 to 10,000 units/ml, and growth was measured for up to 120 hours. Responses varied widely: at 100 units/ml, growth reduction at 96 hours ranged from 85% to 0% across cell lines. Eleven of the 32 lines (34.4%) were classed as sensitive, 5 as intermediate and 16 (50%) as insensitive. In sensitive lines, growth fell as the dose increased. Growth restarted after the drug was removed only at low doses; the authors said higher doses seemed to have some cell-killing effect. Ten of 15 lines injected into nude mice formed tumors, and tumor formation did not correlate with interferon sensitivity. The authors concluded that interferon gamma inhibits mesothelioma cell growth in vitro, with differences between cell lines that agree with observations in patients.

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: Laboratory (in vitro) study of human mesothelioma cell lines, with some lines also injected into nude mice. It was not a clinical treatment trial or an asbestos-risk study.
• Who was studied: 32 human mesothelioma cell lines developed from 22 patients with malignant mesothelioma. Two of the cases had a peritoneal location. The patients' clinical details were listed in a table. Study dates were not stated.
• Exposure: Recombinant human interferon gamma at 0, 10, 100, 1,000 and 10,000 units/ml, for up to 120 hours. Asbestos exposure was not the subject of the experiments.
• Main results:
  • Of the 32 cell lines, 11 (34.4%) were classed as sensitive to interferon gamma and 16 (50%) as insensitive.
  • 5 cell lines were intermediate: their growth was reduced by 20% to 30% at 100 units/ml and by 30% to 40% at 1,000 units/ml.
  • At 100 units/ml, growth inhibition at 96 hours ranged from 85% to 0% across the cell lines.
  • In the 11 sensitive lines, growth was reduced compared with untreated cells in a dose-dependent manner.
  • Growth restarted after interferon gamma was removed only at low doses. According to the authors, higher doses seemed to exert some cytotoxicity.
  • In non-proliferating sensitive cells, viability was not reduced at 10 units/ml after 96 hours or at 100 units/ml after 72 hours. The highest doses showed some cytotoxicity.
  • All 32 cell lines co-expressed cytokeratin and vimentin and did not react with antibodies to CEA.
  • Of the 15 cell lines injected into nude mice, 10 formed tumors.
  • Interferon gamma sensitivity did not correlate with tumor formation in nude mice.
• The authors' conclusion: The authors concluded that interferon gamma has inhibitory effects in vitro on the growth of human malignant mesothelioma cells. They found differences in sensitivity between cell lines and said these agree with observations made in human therapy.
• Limitations the authors state:
  • The authors noted that in patients, immune responses may also account for the effect of interferon gamma, which cell cultures do not capture.
  • The authors stated that the reasons the cell lines responded differently are not clear and need further research.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Mesothelioma.

Medical terms in this study, explained in our Lexicon: Mesothelioma, Malignant Mesothelioma, Asbestos Exposure, Chemotherapy, Prognosis.

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