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PAX5 Haploinsufficiency Induces Low T Cell Infiltration in the Cancer Microenvironment via Reduced Chemokines

Lei Wang1, Xue Liang1, Mi Liang1

  • 1Department of Hematology, Tongji Hospital, Tongji Medical College, Hua Zhong University of Science and Technology, Wu Han, Hubei, China.

Current Molecular Medicine
|December 7, 2021
PubMed
Abstract

Insights

PAX5 mutations reduce tumor immunity by decreasing T cell infiltration. This study reveals that PAX5 haploinsufficiency in tumors leads to immune escape through reduced chemokine expression, impacting T cell presence in the tumor microenvironment.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Loss of function mutations in PAX5 are implicated in tumor development.
  • PAX5 haploinsufficiency promotes tumorigenesis and is linked to immune escape.
  • Mechanisms by which PAX5 mutations induce tumor immune escape remain unclear.

Purpose of the Study:

  • To investigate the impact of PAX5 mutations on tumor immunity.
  • To elucidate the mechanisms underlying PAX5 mutation-induced tumor immune escape.

Main Methods:

  • Constructed PAX5 haplodeletion A20 cell lines using gene-editing technology.
  • Developed allografted A20 tumor models.
  • Evaluated the effects of PAX5 haplodeletion on T cells and chemokines within the tumor microenvironment (TME).

Main Results:

  • PAX5 haplodeletion significantly decreased the percentages of CD3+ CD4+ and CD3+ CD8+ T cells in the TME compared to wild-type controls.
  • Reduced levels of key chemokines (Ccl2, Ccl4, Cxcl9, Cxcl10) were observed in the TME of PAX5 haplodeletion clones.

Conclusions:

  • PAX5 haploinsufficiency leads to decreased T cell infiltration in the tumor microenvironment.
  • Reduced chemokine expression is a key mechanism by which PAX5 haploinsufficiency promotes tumor immune escape.
Keywords:
Pax5cytokineshaploinsufficiencyimmunotherapylymphomanon-t-cell inflamed tumor

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