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MHC Class II Ubiquitination Regulates Dendritic Cell Function and Immunity.

Kayla R Wilson1, Devi Jenika1, Annabelle B Blum1

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MHC II ubiquitination is crucial for dendritic cell (DC) function and immunity. Disrupting this process in mice impairs DC populations, antigen presentation, and both T cell and antibody responses.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • MHC class II (MHC II) antigen presentation by dendritic cells (DCs) is essential for CD4+ T cell immunity.
  • Ubiquitination regulates cell surface MHC II peptide loading, influencing immune responses.

Purpose of the Study:

  • To investigate the impact of MHC II ubiquitination on DC homeostasis, function, and immune presentation.
  • To analyze the consequences of impaired MHC II ubiquitination on T cell and antibody-mediated immunity.

Main Methods:

  • Generation of MHC IIKR mice with non-ubiquitinatable MHC II molecules.
  • Flow cytometry to assess DC populations and surface phenotype.
  • Antigen uptake, endosomal pH, and protease activity assays.
  • Immunization studies with various antigen formulations and analysis of T cell and antibody responses.

Main Results:

  • MHC IIKR mice exhibited reduced numbers of conventional DCs (cDC1, cDC2, pDCs) and altered DC surface phenotype.
  • MHC IIKR cDC1 showed increased inflammatory cytokine production and defective antigen proteolysis.
  • Impaired MHC II and MHC class I antigen presentation was observed in MHC IIKR mice.
  • Reduced T cell responses, impaired CTL killing, lack of follicular T helper cell responses, and minimal antibody generation were noted.

Conclusions:

  • MHC II ubiquitination is vital for DC homeostasis, phenotype, cytokine production, and antigen processing.
  • Defects in MHC II ubiquitination significantly compromise antigen presentation, leading to impaired T cell and antibody-mediated immunity.