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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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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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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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Functions of the Lymphatic and Immune System01:28

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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
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Related Experiment Video

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The bm12 Inducible Model of Systemic Lupus Erythematosus SLE in C57BL/6 Mice
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Abnormal B lymphocyte activation and function in systemic sclerosis.

Ayumi Yoshizaki1, Shinichi Sato1

  • 1Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan.

Annals of Dermatology
|February 13, 2015
PubMed
Summary
This summary is machine-generated.

Systemic sclerosis involves fibrosis and autoimmunity, driven by abnormal B cell function. Targeting CD19 signaling in B cells may reduce autoantibody production and improve fibrosis in SSc patients.

Keywords:
AutoimmunityB lymphocyteBleomycin-induced systemic sclerosis model mouseCD19Systemic sclerosisTight-skin mouse

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Area of Science:

  • Immunology
  • Rheumatology
  • Pathophysiology

Background:

  • Systemic sclerosis (SSc) is a fibrotic autoimmune disease with unknown pathogenic links between autoimmunity and clinical features.
  • B cells are implicated in SSc autoimmunity through autoantibody production and immune cell activation.
  • CD19 is a key regulator of B cell activation, and its dysregulation is implicated in autoimmune diseases.

Purpose of the Study:

  • To investigate the role of CD19 signaling in B cell abnormalities and SSc pathogenesis.
  • To explore the therapeutic potential of targeting CD19 in SSc models.

Main Methods:

  • Analysis of CD19 expression and signaling in B cells from SSc patients and mouse models.
  • Utilizing CD19 transgenic mice and bleomycin-induced SSc mouse models.
  • Assessing autoantibody production, B cell hyper-reactivity, fibrosis, and cytokine production.

Main Results:

  • SSc patient B cells exhibit CD19 overexpression, leading to SSc-specific autoantibody production in mouse models.
  • CD19 transgenic mice spontaneously develop autoantibodies.
  • Loss of CD19 function ameliorates B cell hyper-reactivity, autoantibody production, and fibrosis in SSc models.

Conclusions:

  • Altered B cell function, particularly CD19 signaling, contributes to both autoimmunity and tissue fibrosis in SSc.
  • Targeting CD19 represents a potential therapeutic strategy for systemic sclerosis.