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Exosome-Associated MTA1 in Circulation Is Elevated During Breast Cancer Progression.

Kritisha Bhandari1, Jeng Shi Kong1, Takemi Tanaka1,2

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FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
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PubMed
Summary

Metastasis-associated protein 1 (MTA1) in exosomes shows promise as a biomarker for breast cancer progression. Elevated exosome-associated MTA1 levels accurately predict advanced-stage and aggressive breast cancer, aiding in diagnosis.

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MTA1breast cancercirculating biomarkerexosomesmetastasis

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Metastasis-associated protein 1 (MTA1) is overexpressed in breast cancer, correlating with disease progression and metastasis.
  • MTA1 is transferred via exosomes from cancer cells to other cells and bodily fluids.

Purpose of the Study:

  • To investigate whether exosome-associated MTA1 can serve as an indicator of breast cancer progression.
  • To evaluate the diagnostic potential of exosome-associated MTA1 in breast cancer patients.

Main Methods:

  • Exosomes were isolated from plasma of mice bearing breast cancer xenografts and serum of breast cancer patients using double filtration and polymer precipitation.
  • Western blotting and ELISA were used to quantify MTA1 levels in exosomes.
  • Tumor volumes were measured in mice, and ROC curve analysis was performed for diagnostic accuracy.

Main Results:

  • Knockout of MTA1 in breast cancer cells reduced tumor volume in mice.
  • Exosome-associated MTA1 levels were significantly higher in mice with wild-type tumors compared to those with MTA1-knockout tumors.
  • Serum exosome-associated MTA1 levels were significantly elevated in breast cancer patients, particularly those with advanced stages (III/IV) and specific tumor subtypes (ER/PR-positive, Her2-positive).

Conclusions:

  • Exosome-associated MTA1 is a potential biomarker for breast cancer progression.
  • Elevated serum exosome-associated MTA1 levels are indicative of advanced-stage and aggressive breast cancer.
  • Serum exosome-associated MTA1 demonstrates high accuracy in predicting late-stage breast cancer.