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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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PD-1 Expression Promotes Immune Evasion in B-ALL.

Ana Casado-García1,2, Gonzalo García-Aguilera3, Julio Pozo4

  • 1Experimental Therapeutics and Translational Oncology Program, Instituto de Biología Molecular y Celular del Cáncer, CSIC-USAL, Campus M. de Unamuno s/n, 37007 Salamanca, Spain.

Hematology Reports
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered that increased PD-1 expression in preleukemic cells is a novel marker for immune evasion in childhood B-cell acute lymphoblastic leukemia (B-ALL). Targeting PD-1 offers new therapeutic strategies for B-ALL treatment and prevention.

Keywords:
acutechildhoodgenetic susceptibilityimmune evasionimmunotherapyleukemiamurine modelspreleukemic cells

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Area of Science:

  • Immunology
  • Oncology
  • Pediatric Hematology/Oncology

Background:

  • Childhood B-cell acute lymphoblastic leukemia (B-ALL) involves immune evasion by preleukemic cells during malignant transformation.
  • Mechanisms of immune evasion by preleukemic cells remain largely unknown.

Purpose of the Study:

  • To identify novel markers and mechanisms of immune evasion in pediatric B-ALL.
  • To explore PD-1 as a potential therapeutic target for B-ALL.

Main Methods:

  • Investigated PD-1 expression in preleukemic cells in mouse models with Pax5 inactivation.
  • Correlated PD-1 upregulation with leukemia conversion and analyzed its presence across human B-ALL subtypes.
  • Assessed the role of PD-1 in immune evasion and its impact on natural killer (NK) cell activity.
  • Evaluated the efficacy of PD-1 targeting strategies in vitro and in vivo.

Main Results:

  • Upregulation of PD-1 in preleukemic cells, triggered by Pax5 inactivation, serves as a novel marker for leukemia evasion.
  • Increased PD-1 expression is observed in diverse B-ALL subtypes in both mice and humans.
  • PD-1 is not essential for leukemogenesis but is crucial for evading NK cell responses, allowing leukemia cells to exit the bone marrow.
  • PD-1 blockade sensitizes leukemic cells to immune checkpoint blockade, restoring NK cell killing and eliminating tumors.

Conclusions:

  • PD-1 is identified as a novel therapeutic target for combating leukemic progression in B-ALL.
  • Targeting PD-1 presents new opportunities for the treatment and potential prevention of childhood B-ALL.