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Published on: November 28, 2019
Mechanism of TCF21 Downregulation Leading to Immunosuppression of Tumor-Associated Macrophages in Non-Small Cell Lung
Hong Liu1, Run He2, Xuliang Yang3
1Department of Thyroid Oncology, Chongqing University Cancer Hospital, Chongqing 400030, China.
Abstract:
Lung cancer, as one of the high-mortality cancers, seriously affects the normal life of people. Non-small cell lung cancer (NSCLC) accounts for a high proportion of the overall incidence of lung cancer, and identifying therapeutic targets of NSCLC is of vital significance. This study attempted to elucidate the regulatory mechanism of transcription factor 21 (TCF21) on the immunosuppressive effect of tumor-associated macrophages (TAM) in NSCLC. The experimental results revealed that the expression of TCF21 was decreased in lung cancer cells and TAM. Macrophage polarization affected T cell viability and tumor-killing greatly, and M2-type polarization reduced the viability and tumor-killing of CD8+T cells. Meanwhile, overexpression of TCF21 promoted the polarization of TAM to M1 macrophages and the enhancement of macrophages to the viability of T cells. Furthermore, there appears to be a targeting relationship between TCF21 and Notch, suggesting that TCF21 exerts its influence via the Notch signaling pathway. This study demonstrated the polarization regulation of TAM to regulate the immunosuppressive effect, which provides novel targets for the treatment of lung cancer.
Insights
Transcription factor 21 (TCF21) is decreased in non-small cell lung cancer (NSCLC). Overexpressing TCF21 promotes anti-tumor immunity by reprogramming tumor-associated macrophages (TAM), offering new therapeutic targets for lung cancer.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Non-small cell lung cancer (NSCLC) is a leading cause of cancer mortality.
- Identifying novel therapeutic targets for NSCLC is crucial for improving patient outcomes.
- Tumor-associated macrophages (TAM) play a significant role in the tumor microenvironment and immune suppression.
Purpose of the Study:
- To investigate the regulatory role of transcription factor 21 (TCF21) in the immunosuppressive function of TAM in NSCLC.
- To elucidate the mechanism by which TCF21 influences macrophage polarization and T cell activity.
- To explore the potential of TCF21 as a therapeutic target for NSCLC.
Main Methods:
- Quantitative analysis of TCF21 expression in lung cancer cells and TAM.
- Assessment of macrophage polarization (M1/M2) and its impact on T cell viability and anti-tumor activity.
- Experimental manipulation of TCF21 expression (overexpression) in TAM.
- Investigation of the relationship between TCF21 and the Notch signaling pathway.
Main Results:
- TCF21 expression was found to be downregulated in NSCLC cells and TAM.
- M2-type TAM polarization was associated with reduced CD8+ T cell viability and tumor-killing capacity.
- Overexpression of TCF21 induced M1 macrophage polarization, enhancing T cell viability.
- A targeting relationship between TCF21 and the Notch signaling pathway was identified.
Conclusions:
- TCF21 plays a critical role in regulating TAM polarization and modulating the anti-tumor immune response in NSCLC.
- TCF21 influences macrophage polarization via the Notch signaling pathway.
- TCF21 represents a promising novel therapeutic target for enhancing anti-tumor immunity in lung cancer treatment.
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