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Studying the Role of Alveolar Macrophages in Breast Cancer Metastasis
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Premetastasis.

Yoshiro Maru1

  • 1Department of Pharmacology, Tokyo Women's Medical University, Shinjuku-ku, Tokyo 162-8666, Japan.

Cold Spring Harbor Perspectives in Medicine
|October 17, 2019
PubMed
Summary

Primary tumors create a premetastatic microenvironment in distant organs via secreted factors, hijacking the immune system before cancer cells spread. This sterile inflammation prepares distant sites for metastasis.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Sterile inflammation in primary tumors can influence distant organs.
  • Tumor-secreted factors play a role in pre-metastatic niche formation.
  • The host innate immune system is implicated in pre-metastatic processes.

Purpose of the Study:

  • To elucidate the mechanisms by which primary tumors establish premetastatic microenvironments in distant organs.
  • To investigate the role of tumor secretomes in initiating sterile inflammation at pre-metastatic sites.
  • To understand how the host immune system is manipulated during pre-metastasis.

Main Methods:

  • Analysis of tumor secretomes and their effects on distant tissues.
  • Investigation of immune cell mobilization and function in pre-metastatic sites.

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  • Assessment of vascular permeability and extracellular matrix changes.

    • Main Results:

    • Tumor-derived secretomes induce sterile inflammation in distant organs prior to metastasis.
    • The pre-metastatic microenvironment is established through hijacking the host innate immune system.
    • Key biological manifestations include increased vascular permeability, immune cell mobilization, ECM degradation, and immunosuppression.

    Conclusions:

    • Primary tumors actively prepare distant sites for metastasis through a sterile inflammatory process.
    • Tumor secretomes and immune system manipulation are critical for establishing the pre-metastatic niche.
    • Understanding these mechanisms offers potential therapeutic targets for preventing metastasis.