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Initiation of Metastatic Breast Carcinoma by Targeting of the Ductal Epithelium with Adenovirus-Cre: A Novel Transgenic Mouse Model of Breast Cancer
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Defects in innate immunity render breast cancer initiating cells permissive to oncolytic adenovirus

Laura Ahtiainen1, Cristina Mirantes, Tiina Jahkola

  • 1Transplantation Laboratory, Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, University of Helsinki, Helsinki, Finland. laura.ahtiainen@helsinki.fi

Plos One
|November 17, 2010
PubMed
Abstract

Insights

Cancer stem cells (CSCs) exhibit dysregulated innate immunity, impairing oncolytic adenovirus therapy. Understanding CSC immune evasion mechanisms is crucial for developing effective cancer treatments and improving virotherapy outcomes.

Area of Science:

  • Oncology
  • Immunology
  • Virology

Background:

  • Cancer stem cells (CSCs) are a resistant population implicated in cancer relapse.
  • Oncolytic adenoviruses are a potential therapeutic strategy targeting CSCs.

Purpose of the Study:

  • To investigate the innate immune response mechanisms of breast cancer stem cells (CSCs) to oncolytic adenovirus.
  • To compare immune recognition and type I interferon (IFN) response in CSCs versus normal stem cells and non-CSCs.

Main Methods:

  • Studied innate immunity to oncolytic adenovirus Ad5/3-Delta24 in breast cancer cells, CSCs, and normal stem cells.
  • Compared virus recognition via Toll-like receptors (TLRs) 2 and 9 and type I IFN response.
  • Assessed TLR trafficking, cofactor MyD88, and suppressor of cytokine signaling (SOCS/TAM) pathway activity.

Main Results:

  • Breast cancer CSCs exhibit dysfunctional virus recognition due to impaired TLR9/MyD88 trafficking and absence of TLR2.
  • Normal stem cells possess intact type I IFN signaling with constitutively active TLRs.
  • CSCs show increased inhibitory SOCS/TAM signaling, leading to defective type I IFN induction and permissivity to oncolytic adenovirus.

Conclusions:

  • Dysregulated innate immunity in CSCs contributes to treatment resistance and relapse.
  • Understanding CSC immune evasion is vital for advancing virotherapy and immunotherapy.
  • CSCs are a critical target for diagnostic, prognostic, and therapeutic strategies in cancer treatment.

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