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Related Concept Videos

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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Related Experiment Video

Updated: Jun 24, 2026

Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
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4-1BB functions as a survival factor in dendritic cells.

Beom K Choi1, Young H Kim, Patrick M Kwon

  • 1R&D Center for Cancer Therapeutics, National Cancer Center, Ilsan, Korea.

Journal of Immunology (Baltimore, Md. : 1950)
|March 21, 2009
PubMed
Summary

The immune receptor 4-1BB (CD137) enhances dendritic cell (DC) survival and function. Lacking 4-1BB reduces DC longevity, impairing T cell responses and immune memory formation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • 4-1BB (CD137) is expressed on dendritic cells (DCs), but its precise biological role remains unclear.
  • Understanding 4-1BB's function on DCs is crucial for deciphering immune regulation and developing novel immunotherapies.

Purpose of the Study:

  • To investigate the role of 4-1BB in dendritic cell maturation, survival, and function.
  • To elucidate the impact of 4-1BB deficiency on DC-mediated T cell activation and immune memory.

Main Methods:

  • Comparative analysis of 4-1BB-intact (4-1BB(+/+)) and 4-1BB-deficient (4-1BB(-/-)) dendritic cells.
  • Assessment of DC maturation, survival rates (Bcl-2, Bcl-x(L) expression), and turnover in vitro and in vivo.
  • Adoptive transfer experiments with OVA-pulsed DCs and OVA-specific CD4(+) T cells in mice.
  • In vivo studies using Propionibacterium acnes-induced liver granuloma model.

Main Results:

  • DC maturation proceeded normally in 4-1BB(-/-) DCs, but their survival rate was significantly reduced due to decreased Bcl-2 and Bcl-x(L) expression.
  • 4-1BB(-/-) DCs exhibited increased turnover and impaired migration to lymph node T cell zones, leading to reduced CD4(+) T cell proliferation.
  • Adoptive transfer of 4-1BB(-/-) DCs resulted in fewer OVA-specific memory CD4(+) T cells.
  • In vivo, 4-1BB deficiency led to smaller liver granulomas, suggesting reduced DC longevity.

Conclusions:

  • 4-1BB is essential for maintaining dendritic cell longevity and optimal survival post-maturation.
  • The presence of 4-1BB on DCs critically influences DC-T cell interaction, migration, and the generation of robust CD4(+) T cell memory.
  • These findings highlight 4-1BB as a key regulator of DC immunogenicity and T cell-mediated adaptive immunity.