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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Related Experiment Video

Updated: May 1, 2026

Generation of Human Chimeric Antigen Receptor Regulatory T Cells
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Treg functional stability and its responsiveness to the microenvironment.

Joseph Barbi1, Drew Pardoll, Fan Pan

  • 1Department of Oncology, Immunology and Hematopoiesis Division, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Immunological Reviews
|April 10, 2014
PubMed
Summary

Regulatory T cells (Tregs) maintain immune homeostasis. This review explores Treg heterogeneity and mechanisms influencing their stability and function during inflammation, reconciling conflicting research findings.

Keywords:
Foxp3Tregfunctional stabilityproinflammatory cytokines

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Regulatory T cells (Tregs) are crucial for preventing autoimmunity and tissue damage via immune suppression.
  • The stability of the Treg lineage and its key transcription factor, Foxp3, under inflammatory conditions is a subject of ongoing debate.
  • Conflicting reports exist regarding Treg resilience versus susceptibility to Foxp3 loss and functional impairment.

Purpose of the Study:

  • To review and discuss the mechanisms underlying the observed stability and instability of Foxp3(+) Treg identity and function.
  • To explore the heterogeneity within the Treg population and their responses to environmental cues.
  • To reconcile the divergent findings on Treg stability.

Main Methods:

  • Review of existing literature on Treg stability and function.
  • Analysis of transcriptional, epigenetic, and posttranslational regulatory mechanisms.
  • Examination of Treg subset responses to microenvironmental factors.

Main Results:

  • Treg stability is influenced by complex mechanisms including transcriptional and epigenetic programs.
  • Posttranslational modifications and transcript targeting also play roles in modulating Treg function.
  • Environmental cues significantly impact Treg subset responses and overall stability.

Conclusions:

  • Understanding Treg heterogeneity and their dynamic responses to the microenvironment is key to resolving debates on Treg stability.
  • Diverse regulatory mechanisms contribute to the plasticity and resilience of Tregs.
  • Further research into these mechanisms will enhance our comprehension of immune regulation and autoimmunity.