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Stat5-/- CD4+ T cells elicit anti-melanoma effect by CD4+ T cell remolding and Notch1 activation

Ke Jin1,2, Tong Li3,4, Zhiyong Miao3,5

  • 1Laboratory of Human Diseases and Immunotherapies, West China Hospital, Sichuan University, Chengdu, 610041, China. jinke@wchscu.cn.

Science China. Life Sciences
|May 4, 2022
PubMed

Insights

Signal transducer and activator of transcription 5 (Stat5) deficiency in CD4+ T cells enhances anti-melanoma activity. Stat5-deficient cells promote Th17 cell polarization, boosting antitumor immunity against B16 melanoma.

Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Signaling

Background:

  • Signal transducers and activators of transcription 5 (Stat5) are crucial for T helper cell differentiation and function.
  • The role of Stat5 in regulating the antitumor activity of tumor-infiltrating CD4+ T cells remains largely unexplored.

Purpose of the Study:

  • To investigate the function of Stat5 in CD4+ T cells within the tumor microenvironment.
  • To elucidate the impact of Stat5 on the differentiation and anti-melanoma efficacy of T helper 17 (Th17) cells.

Main Methods:

  • Generation of mice with specific deletion of Stat5 in CD4+ T cells.
  • Analysis of tumor-infiltrating lymphocytes (TILs) in B16 melanoma models.
  • Assessment of Th17 cell polarization (IFN-γ+ and IFN-γ- subtypes) and Notch1 pathway activation.

Main Results:

  • Mice lacking Stat5 in CD4+ T cells showed reduced susceptibility to B16 melanoma development and metastasis.
  • Stat5-deficient CD4+ naïve T cells preferentially differentiated into IFN-γ+ and IFN-γ- Th17 cells.
  • These Stat5-deficient Th17 cells exhibited enhanced anti-melanoma activity, partly through increased Notch1 pathway activation.

Conclusions:

  • Stat5 plays a novel inhibitory role in regulating tumor-specific Th17 cell differentiation and function in melanoma.
  • Targeting Stat5 and Th17-associated pathways offers a potential strategy for developing novel melanoma immunotherapies.
Keywords:
CD4+ tumor-infiltrating lymphocytesIFN-γ+ Th17 cellNotch1Stat5melanoma

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