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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 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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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
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T Cell Activation and Clonal Selection01:22

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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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Cytotoxic T Cells-mediated Immune Response01:27

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Structure and Function of Leukocytes01:21

Structure and Function of Leukocytes

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An adult in good health typically has between 4,500 and 11,000 leukocytes, or white blood cells, per microliter of blood, which constitutes about 1% of the total blood volume. Unlike red blood cells, white blood cells contain a nucleus and other cellular organelles but do not have hemoglobin. Most white blood cells reside in connective tissues, particularly in lymphatic organs such as the lymph nodes, with only a small fraction present in circulating blood.
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Isolation of Group 2 Innate Lymphoid Cells from Mouse Nasal Mucosa to Detect the Expression of CD226
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Interleukin 2: the molecule and its function.

R J Robb1

  • 1Central Research and Development Department, Glenolden Laboratory, E.1. du Pont de Nemours and Co., Glenolden, PA 19036, USA.

Immunology Today
|October 8, 2014
PubMed
Summary
This summary is machine-generated.

Interleukin-2 (IL2) is a crucial factor for T cell proliferation and influences other immune cells. This review details the biochemistry of IL2 and its receptor, highlighting its roles in cellular growth and differentiation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Interleukin-2 (IL2) is vital for T cell proliferation.
  • IL2 mediates responses through a high-affinity membrane receptor.
  • IL2 also affects natural killer cells and antibody secretion.

Purpose of the Study:

  • To review the biochemical understanding of IL2 and its receptor.
  • To discuss new information on IL2's role in cellular responses.
  • To explore IL2's function as both a growth factor and differentiation signal.

Main Methods:

  • Purification of IL2 and its receptor to homogeneity.
  • Extensive molecular-level characterization of IL2 and its receptor.
  • Review of existing literature and recent findings on IL2 function.

Main Results:

  • IL2 is essential for activated T cell proliferation.
  • IL2 influences natural killer cell activity.
  • IL2 impacts antibody secretion and acts as a growth/differentiation signal.

Conclusions:

  • IL2 and its receptor are well-characterized at the molecular level.
  • IL2 plays a multifaceted role in immune cell responses.
  • Understanding IL2's biochemistry is key to its cellular functions.