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Updated: Oct 4, 2025
Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
Published on: August 13, 2013
IKKα-deficient lung adenocarcinomas generate an immunosuppressive microenvironment by overproducing Treg-inducing
Na-Young Song1, Xin Li1, Buyong Ma2
1Laboratory of Cancer Immunometabolism, Center for Cancer Research, National Cancer Institute, NIH, Frederick, MD 21702.
Abstract:
The tumor microenvironment (TME) provides potential targets for cancer therapy. However, how signals originating in cancer cells affect tumor-directed immunity is largely unknown. Deletions in the CHUK locus, coding for IκB kinase α (IKKα), correlate with reduced lung adenocarcinoma (ADC) patient survival and promote KrasG12D-initiated ADC development in mice, but it is unknown how reduced IKKα expression affects the TME. Here, we report that low IKKα expression in human and mouse lung ADC cells correlates with increased monocyte-derived macrophage and regulatory T cell (Treg) scores and elevated transcription of genes coding for macrophage-recruiting and Treg-inducing cytokines (CSF1, CCL22, TNF, and IL-23A). By stimulating recruitment of monocyte-derived macrophages from the bone marrow and enforcing a TNF/TNFR2/c-Rel signaling cascade that stimulates Treg generation, these cytokines promote lung ADC progression. Depletion of TNFR2, c-Rel, or TNF in CD4+ T cells or monocyte-derived macrophages dampens Treg generation and lung tumorigenesis. Treg depletion also attenuates carcinogenesis. In conclusion, reduced cancer cell IKKα activity enhances formation of a protumorigenic TME through a pathway whose constituents may serve as therapeutic targets for KRAS-initiated lung ADC.
Insights
Reduced IκB kinase α (IKKα) in lung cancer cells promotes tumor growth by increasing immunosuppressive cells. Targeting this pathway could offer new therapies for KRAS-mutated lung adenocarcinoma.
Area of Science:
- Oncology
- Immunology
- Cancer Biology
Background:
- The tumor microenvironment (TME) is crucial for cancer progression and a target for therapy.
- The role of cancer cell-intrinsic signals in shaping anti-tumor immunity remains unclear.
- Deletions in the CHUK gene, encoding IκB kinase α (IKKα), are linked to poor survival in lung adenocarcinoma (ADC) patients.
Purpose of the Study:
- To investigate how reduced IKKα expression in lung ADC cells influences the TME and anti-tumor immunity.
- To elucidate the molecular mechanisms by which IKKα loss promotes ADC progression.
Main Methods:
- Analysis of human and mouse lung ADC tissues for IKKα expression and TME composition.
- Gene expression profiling to identify cytokines associated with low IKKα.
- Experimental manipulation of key signaling molecules (TNFR2, c-Rel, TNF) and cell populations (Tregs, macrophages) in mouse models.
Main Results:
- Low IKKα expression in lung ADC correlates with increased infiltration of monocyte-derived macrophages and regulatory T cells (Tregs).
- Reduced IKKα leads to elevated expression of cytokines (CSF1, CCL22, TNF, IL-23A) that recruit macrophages and induce Tregs.
- A signaling cascade involving TNF/TNFR2/c-Rel promotes Treg generation and lung ADC progression.
- Depletion of TNFR2, c-Rel, TNF, or Tregs attenuates tumor growth.
Conclusions:
- Reduced IKKα activity in cancer cells promotes a protumorigenic TME by fostering immunosuppressive cell populations.
- The identified pathway involving cytokines, macrophages, and Tregs represents a potential therapeutic target for KRAS-initiated lung ADC.
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