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FcγRIIb deficiency inhibits tumor development by attenuating the immunosuppressive phenotype of MDSCs

Wenyan Chen1, JiaHua Pan2, Xiaomin Ning3

  • 1Key Laboratory of the Jiangsu Higher Education Institutions for Nucleic Acid & Cell Fate Regulation (Yangzhou University), Institute of Translational Medicine, School of Medicine, Yangzhou University, Yangzhou, 225001, PR China; School of Basic Medical Sciences, Jiangsu Medical College, Yancheng, 224005, PR China.

Immunology Letters
|April 13, 2026
PubMed

Insights

FcγRIIb deficiency enhances myeloid-derived suppressor cell (MDSC) differentiation and reduces tumor growth. This suggests FcγRIIb is a potential therapeutic target for anti-tumor therapies, improving immune responses.

Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Biology

Background:

  • Myeloid-derived suppressor cells (MDSCs) are crucial regulators of tumor growth and anti-tumor immunity.
  • Understanding MDSC programming is vital for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of FcγRIIb in the programming and function of MDSCs.
  • To evaluate FcγRIIb as a potential therapeutic target for anti-tumor strategies.

Main Methods:

  • Utilized FcγRIIb-deficient (FcγRIIb-/-) and wild-type (WT) mice models.
  • Analyzed MDSC differentiation, accumulation, and immunosuppressive phenotype.
  • Performed adoptive transfer experiments with MDSC subsets.
  • Investigated the NF-κB signaling pathway activation.
  • Examined FcγRIIb expression in human MDSCs from lung cancer patients.

Main Results:

  • FcγRIIb deficiency promoted MDSC differentiation and splenic accumulation in tumor-bearing mice.
  • FcγRIIb deficiency attenuated the immunosuppressive phenotype of both PMN-MDSCs and M-MDSCs.
  • Tumor growth was significantly reduced in FcγRIIb-/- mice and following adoptive transfer of FcγRIIb-/- MDSCs.
  • NF-κB pathway activation correlated with the diminished immunosuppressive phenotype in FcγRIIb-/- MDSCs.
  • Elevated FcγRIIb expression in human MDSCs was associated with lung cancer progression.

Conclusions:

  • FcγRIIb plays a critical role in maintaining the immunosuppressive phenotype of MDSCs.
  • Targeting FcγRIIb represents a promising therapeutic strategy to enhance anti-tumor immunity and control tumor progression.
Keywords:
Anti-tumor therapyFc gamma receptor IIbImmunosuppressionLung cancerMyeloid-derived suppressor cells

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