STAT5 and STAT3 balance shapes dendritic cell function and tumour immunity

Nature. 2025 Jul;643(8071):519-528. doi: 10.1038/s41586-025-09000-3. Epub 2025 May 14.

Abstract

Immune checkpoint blockade (ICB) has transformed cancer therapy1,2. The efficacy of immunotherapy depends on dendritic cell-mediated tumour antigen presentation, T cell priming and activation3,4. However, the relationship between the key transcription factors in dendritic cells and ICB efficacy remains unknown. Here we found that ICB reprograms the interplay between the STAT3 and STAT5 transcriptional pathways in dendritic cells, thereby activating T cell immunity and enabling ICB efficacy. Mechanistically, STAT3 restrained the JAK2 and STAT5 transcriptional pathway, determining the fate of dendritic cell function. As STAT3 is often activated in the tumour microenvironment5, we developed two distinct PROTAC (proteolysis-targeting chimera) degraders of STAT3, SD-36 and SD-2301. STAT3 degraders effectively degraded STAT3 in dendritic cells and reprogrammed the dendritic cell-transcriptional network towards immunogenicity. Furthermore, STAT3 degrader monotherapy was efficacious in treatment of advanced tumours and ICB-resistant tumours without toxicity in mice. Thus, the crosstalk between STAT3 and STAT5 transcriptional pathways determines the dendritic cell phenotype in the tumour microenvironment and STAT3 degraders hold promise for cancer immunotherapy.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Dendritic Cells* / cytology
  • Dendritic Cells* / drug effects
  • Dendritic Cells* / immunology
  • Dendritic Cells* / metabolism
  • Female
  • Humans
  • Immune Checkpoint Inhibitors / pharmacology
  • Immune Checkpoint Inhibitors / therapeutic use
  • Immunotherapy
  • Janus Kinase 2 / metabolism
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Neoplasms* / immunology
  • Neoplasms* / pathology
  • Neoplasms* / therapy
  • Proteolysis / drug effects
  • STAT3 Transcription Factor* / antagonists & inhibitors
  • STAT3 Transcription Factor* / metabolism
  • STAT5 Transcription Factor* / antagonists & inhibitors
  • STAT5 Transcription Factor* / genetics
  • STAT5 Transcription Factor* / metabolism
  • Signal Transduction
  • T-Lymphocytes / immunology
  • Tumor Microenvironment / drug effects
  • Tumor Microenvironment / immunology

Substances

  • STAT3 Transcription Factor
  • STAT5 Transcription Factor
  • Immune Checkpoint Inhibitors
  • Janus Kinase 2
  • Stat3 protein, mouse