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Related Concept Videos

B Cell Activation and Differentiation01:24

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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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The JAK-STAT Signaling Pathway01:20

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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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T Cell Types and Functions01:24

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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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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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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Related Experiment Video

Updated: Jun 25, 2025

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

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IL-4 Licenses B Cell Activation Through Cholesterol Synthesis.

Holly R Steach, Autumn G York, Mathias H Skadow

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    Interleukin-4 (IL-4) signaling promotes B cell proliferation by upregulating cholesterol synthesis, essential for cell growth and division. This pathway enhances B cell activation independently of environmental nutrient availability.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Metabolic Regulation

    Background:

    • Lymphocyte activation transitions from catabolic metabolism to an anabolic state, similar to cancer cells, requiring increased nutrients for proliferation.
    • Interleukin-4 (IL-4) is a key cytokine that supports B cell activation, but its precise mechanisms remain unclear.
    • Understanding IL-4's role is crucial for deciphering immune responses and developing targeted therapies.

    Approach:

    • Utilized single-cell RNA sequencing to analyze gene expression changes in B cells following IL-4 signaling.
    • Investigated the requirement of cholesterol biosynthesis for B cell activation in vivo and in vitro.
    • Manipulated lipid availability to assess the impact on B cell endoplasmic reticulum expansion, cell cycle progression, and proliferation.

    Key Points:

    • IL-4 signaling transcriptionally upregulates the cholesterol biosynthetic program in early B cell responses.
    • Cholesterol biosynthesis is essential for B cell activation and proliferation in vivo.
    • Cholesterol is required for B cell endoplasmic reticulum expansion, cell cycle progression, and proliferation in vitro.

    Conclusions:

    • IL-4 acts as a B cell growth factor by rewiring lipid anabolic pathways, specifically cholesterol biosynthesis.
    • This rewiring makes B cells less dependent on environmental nutrient availability for proliferation.
    • The findings reveal a novel mechanism by which IL-4 supports B cell expansion and immune responses.