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Related Concept Videos

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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UNC93B1 variants underlie TLR7-dependent autoimmunity.

Christine Wolf1, Ee Lyn Lim2, Mohammad Mokhtari3

  • 1Department of Pediatrics, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden 01307, Germany.

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Genetic variants in UNC93B1 disrupt Toll-like receptor 7 (TLR7) regulation, causing autoimmune disease. This research highlights UNC93B1

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Area of Science:

  • Immunology
  • Genetics
  • Rheumatology

Background:

  • Nucleic acid-sensing Toll-like receptors (TLRs) are crucial for antiviral immunity.
  • Dysregulated TLR7 signaling, particularly from self-nucleic acids, is linked to systemic lupus erythematosus (SLE).
  • UNC93B1 protein is essential for the proper function of TLRs 3, 7, 8, and 9.

Purpose of the Study:

  • To investigate the role of UNC93B1 variants in early-onset SLE.
  • To understand the functional consequences of UNC93B1 variants on TLR signaling.
  • To explore the link between UNC93B1 and TLR7-mediated autoimmunity.

Main Methods:

  • Identified and characterized UNC93B1 variants (E92G and R336L) in SLE patients.
  • Assessed cytokine production (TNF-α, IL-6) in patient-derived cells and mouse macrophages stimulated with TLR agonists.
  • Investigated the impact of the E92G variant on UNC93B1 protein stability and interaction with TLR7.
  • Analyzed type I Interferon (IFN) signaling pathways.

Main Results:

  • Four patients with early-onset SLE carried UNC93B1 variants E92G or R336L.
  • Cells with UNC93B1 variants exhibited heightened TNF-α and IL-6 production upon TLR7/8 stimulation.
  • The E92G variant led to UNC93B1 protein instability and impaired TLR7 interaction.
  • This resulted in selective TLR7 hyperactivation and constitutive type I IFN signaling.

Conclusions:

  • UNC93B1 variants can cause selective TLR7 hyperactivation, contributing to SLE pathogenesis.
  • UNC93B1 plays a critical role in regulating TLR subtype-specific responses.
  • Targeting TLR7 presents a potential therapeutic strategy for UNC93B1-associated autoimmune diseases like SLE.