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Peroxisome deficiency underlies failures in hepatic immune cell development and antigen presentation in a severe

Brendon D Parsons1, Daniel Medina-Luna2, Michal Scur2

  • 1University of Alberta, Department of Laboratory Medicine and Pathology, Edmonton, AB T6G 1C9, Canada.

Cell Reports
|February 8, 2024
PubMed

Insights

Peroxisome biogenesis disorders cause developmental defects and hematopoietic issues. This study reveals peroxisomes regulate immune cell antigen presentation, crucial for T cell responses.

Area of Science:

  • Immunometabolism
  • Cell Biology
  • Developmental Biology

Background:

  • Peroxisome biogenesis disorders (PBDs) are metabolic conditions causing severe developmental defects.
  • Peroxisomes are vital organelles involved in immunometabolism, but their role in immune development is largely unknown.
  • The full spectrum of PBDs and their impact on immune function require further investigation.

Purpose of the Study:

  • To characterize the hepatic immune compartment in a neonatal PBD mouse model.
  • To investigate the role of peroxisomes in developmental hematopoiesis.
  • To explore the function of peroxisomes in immune cell regulation and antigen presentation.

Main Methods:

  • Single-cell RNA sequencing of hepatic immune cells from a neonatal PBD mouse model.
  • Analysis of hematopoietic defects in the PBD mouse model.
  • Assessment of major histocompatibility class II expression and antigen presentation in dendritic cells.

Main Results:

  • Hematopoietic defects are a characteristic feature of this severe PBD murine model.
  • Peroxisomes play a role in regulating major histocompatibility class II expression.
  • Peroxisomes are involved in antigen presentation to CD4+ T cells by dendritic cells.

Conclusions:

  • Peroxisome dysfunction impacts developmental hematopoiesis.
  • Peroxisomes are critical regulators of immune responses, particularly antigen presentation.
  • This research expands understanding of PBD mechanisms and peroxisome function in immunometabolism.

Keywords:
CP: Cell biologyCP: ImmunologyDAGMCH class IIPKC-δantigen presentationdendritic cellsimmunometabolismneonatal liverperoxisome biogenesis disordersperoxisomesscRNA-seq

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