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Cancer Stem Cells and Tumor Maintenance02:40

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Early diagnosis and treatment can often cure cancer. However, even with treatment, residual cells called cancer stem cells (CSC) might remain, often causing tumor recurrence. These cancer stem cells possess the potential for self-renewal and multi-lineage differentiation and are often responsible for the therapeutic resistance displayed in most cancers.
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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Related Experiment Video

Updated: Mar 31, 2026

Studying Pancreatic Cancer Stem Cell Characteristics for Developing New Treatment Strategies
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Mycoplasma Infection Alters Cancer Stem Cell Properties in Vitro.

Craig Gedye1,2, Tracy Cardwell1,3, Nektaria Dimopoulos1

  • 1Ludwig Institute for Cancer Research, Austin Hospital, Studley Road, Heidelberg, VIC, 3084, Australia.

Stem Cell Reviews and Reports
|October 31, 2015
PubMed
Summary

Mycoplasma hyorhinis infection in cancer cell lines causes unpredictable effects on cancer stem cell properties. Regular Mycoplasma testing is crucial for reliable cancer research.

Keywords:
Cancer cell lines, CD133Cancer stem cellsMycoplasma

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Area of Science:

  • Oncology
  • Microbiology
  • Cell Biology

Background:

  • Cancer cell lines are vital for modeling cancer stem cells (CSCs).
  • Mycoplasma contamination is a common, often undetected, issue in cell cultures.
  • The impact of Mycoplasma on CSC research is poorly understood.

Purpose of the Study:

  • To investigate the effects of Mycoplasma hyorhinis infection on melanoma cell lines modeled for cancer stem cell properties.
  • To assess the influence of Mycoplasma on key CSC markers, clonogenicity, proliferation, and gene expression.
  • To emphasize the importance of Mycoplasma surveillance in cancer stem cell research.

Main Methods:

  • Utilized early passage melanoma cell lines for experiments.
  • Deliberately infected cell line aliquots with Mycoplasma hyorhinis.
  • Assessed effects on putative CSC markers, clonogenicity, proliferation, and global gene expression.
  • Investigated cell lines cultured in stem cell media (SCM).

Main Results:

  • Mycoplasma hyorhinis infection led to poorly reproducible results in early passage melanoma cell lines.
  • Infection induced variable and unpredictable effects on CSC marker expression, clonogenicity, and proliferation.
  • Cell lines cultured in SCM were also susceptible to Mycoplasma contamination.
  • Global gene expression patterns were significantly altered by Mycoplasma infection.

Conclusions:

  • Mycoplasma contamination significantly confounds research on cancer stem cells.
  • The study underscores the critical need for routine Mycoplasma testing in all cell culture experiments, particularly those investigating tumor heterogeneity.
  • Failure to monitor Mycoplasma status can lead to unreliable and irreproducible research findings in cancer stem cell biology.