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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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Related Experiment Video

Updated: Sep 22, 2025

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
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Brucella activates the host RIDD pathway to subvert BLOS1-directed immune defense.

Kelsey Michelle Wells1, Kai He2, Aseem Pandey1,3

  • 1Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Bryan, United States.

Elife
|May 19, 2022
PubMed
Summary

Brucella bacteria evade immune defenses by targeting the BLOS1 protein via regulated IRE1α-dependent decay (RIDD). Blocking this process enhances resistance to brucellosis and other infections.

Keywords:
BLOS1BrucellaBrucella-containing vacuoles/lysosomes (BCVs)coronavirusinfectious diseaseintracellular parasitismmicrobiologymouseregulated IRE1α-dependent decay (RIDD)

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Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Phagocytosis and lysosomal destruction are key innate immune mechanisms against pathogens.
  • Brucella, a global zoonotic bacterium, causes brucellosis by evading these defenses.

Purpose of the Study:

  • To investigate how Brucella subverts host innate immunity.
  • To identify host factors and pathways involved in Brucella's intracellular survival.

Main Methods:

  • Studied the role of regulated IRE1α-dependent decay (RIDD) in Brucella infection.
  • Utilized RIDD-deficient cells and RIDD-incompetent IRE1α variants in mice.
  • Analyzed Bloc1s1 mRNA and BLOS1 protein function.
  • Investigated the BLOC-1-related complex (BORC) and lysosome trafficking.

Main Results:

  • Brucella activates RIDD to degrade Bloc1s1 mRNA, reducing BLOS1 protein levels.
  • RIDD deficiency or Bloc1s1 inactivation confers resistance to Brucella infection.
  • BLOS1 disruption impairs BORC assembly and lysosomal trafficking of Brucella-containing vacuoles (BCVs).
  • Murine hepatitis coronavirus also exploits the RIDD-BLOS1 pathway.

Conclusions:

  • Host RIDD activity on BLOS1 is crucial for Brucella's intracellular parasitism.
  • BLOS1 acts as an immune defense factor, with its function hijacked by multiple pathogens.
  • Targeting the RIDD-BLOS1 axis offers a potential strategy against Brucella and other infections.