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Immune Regulation by Cytosolic DNA Sensors in the Tumor Microenvironment

Keitaro Fukuda1,2

  • 1RIKEN Center for Integrative Medical Sciences (IMS), Laboratory for Skin Homeostasis, Yokohama 230-0045, Japan.

Cancers
|April 13, 2023
PubMed

Insights

Cyclic GMP-AMP synthase (cGAS) and Absent in melanoma 2 (AIM2) sense cytosolic DNA to activate immunity. AIM2 promotes tumor growth by inhibiting STING-IFN signaling, making it a potential cancer immunotherapy target.

Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Biology

Background:

  • Cyclic GMP-AMP synthase (cGAS) and Absent in melanoma 2 (AIM2) are cytosolic DNA sensors (CDSs) crucial for immune responses.
  • These sensors are present in immune and tumor cells, recognizing tumor-derived DNA to activate innate and adaptive immunity against tumors.
  • STING acts downstream of cGAS, mediating type I interferon (IFN) signaling, a key pathway in anti-tumor immunity.

Purpose of the Study:

  • To review the roles of cGAS, STING, and AIM2 in the tumor microenvironment.
  • To discuss the potential of targeting these molecules for cancer immunotherapy.
  • To highlight the complexities of STING agonist efficacy and the dual role of AIM2.

Main Methods:

  • Literature review of current research on cGAS, STING, and AIM2.
  • Analysis of their functions in immune and tumor cells within the tumor microenvironment.
  • Discussion of therapeutic strategies involving these pathways.

Main Results:

  • cGAS and AIM2 activation by cytosolic DNA triggers anti-tumor immune responses.
  • STING agonists have shown limited efficacy in clinical trials, necessitating optimized administration and exploration of other pathways.
  • AIM2 activity can paradoxically promote tumor growth by inhibiting STING-type I IFN signaling.

Conclusions:

  • AIM2's role in promoting tumor growth presents it as a potential therapeutic target for cancer immunotherapies.
  • Understanding the intricate interplay between cGAS, STING, and AIM2 is vital for developing effective anti-tumor treatments.
  • Future strategies may involve targeting AIM2 or optimizing STING-based therapies.
Keywords:
AIM2IL-18IL-1βSTINGTIDCcGAScytosolic DNA sensorimmunotherapytumor microenvironmenttype I IFN

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