ATM-Mediated DNA damage signals mediate immune escape through integrin-αvβ3-dependent mechanisms

Masahisa Jinushi, Shigeki Chiba, Muhammad Baghdadi, Ichiro Kinoshita, Hirotoshi Dosaka-Akita, Koyu Ito, Hironori Yoshiyama, Hideo Yagita, Toshimitsu Uede, Akinori Takaoka

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Although the tumor microenvironment plays a critical role in tumor progression and metastasis, the relationship between chemotherapy resistance and modulation of the tumor microenvironment remains unclear. Here, we report a novel mechanism showing how constitutive DNA damage signals in therapy-resistant tumor cells suppress antitumor immunity in an integrin-αvβ3- dependent manner. Integrin-αvβ3 was upregulated on various therapy-resistant tumor cells through chronic activation of ATM/Chk2-and NFκB-mediated pathways. Inhibiting tumor-specific expression of integrin-αvβ3 improved therapeutic responses to anticancer drugs by stimulating endogenous host immune systems. Mechanistic investigations revealed that tumor-specific integrin-αvβ3 expression targeted dendritic cells, facilitating their ability to phagocytose viable therapy-resistant tumor cells and thereby impaired their ability to cross-prime antigen-specific T lymphocytes. Together, our results clarify the detrimental effects of constitutive DNA damage signals to chemosensitivity and antitumor immunity. Furthermore, these findings suggest that integrin-αvβ3 targeting may benefit patients' refractory to current anticancer regimens by defeating DNA damage signaling-induced immune escape.

Original languageEnglish
Pages (from-to)56-65
Number of pages10
JournalCancer Research
Issue number1
Publication statusPublished - 2012 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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