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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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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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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Cell-surface receptors, also known as transmembrane receptors, are cell surface, membrane-anchored (integral) proteins that bind to external ligand molecules. This type of receptor spans the plasma membrane and performs signal transduction, converting an extracellular signal into an intracellular signal. Ligands that interact with cell-surface receptors do not have to enter the cell that they affect. Cell-surface receptors are also called cell-specific proteins or markers because they are...
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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
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Memory control by the B cell antigen receptor.

Niklas Engels1, Jürgen Wienands1

  • 1Institute of Cellular & Molecular Immunology, University Medical Center Göttingen, Göttingen, Germany.

Immunological Reviews
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PubMed
Summary

Immune memory relies on memory B cells (MBCs) switching from IgM to other antibody types like IgG. Understanding these class-switched B cell populations is key to effective humoral immunity against pathogens.

Keywords:
B cellsantibodiesmemorysignal transductionsignaling proteinsvaccination

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Humoral immunological memory is defined by memory B cells (MBCs) that have undergone immunoglobulin class switching from IgM to other isotypes.
  • Serum immunoglobulins, particularly IgG, reflect an individual's antigen exposure history and are crucial for protection against re-encountered pathogens.
  • While IgG is central, IgA and IgE also contribute to humoral immunity depending on the pathogen and infection route.

Purpose of the Study:

  • To summarize the phenotypic characteristics of distinct memory B cell subpopulations.
  • To discuss the roles of different B cell antigen receptor isotypes in the functional traits of class-switched B cell populations.
  • To address the ongoing debate regarding the molecular mechanisms driving isotype switching in memory B cell responses.

Main Methods:

  • Phenotypic characterization of memory B cell subpopulations.
  • Analysis of B cell antigen receptor isotypes.
  • Review of current literature on molecular mechanisms of immunoglobulin class switching.

Main Results:

  • Distinct memory B cell subpopulations possess unique phenotypic characteristics.
  • B cell antigen receptor isotypes significantly influence the functional attributes of class-switched B cells.
  • The molecular underpinnings of isotype preponderance in memory responses remain an area of active research and debate.

Conclusions:

  • Class-switched memory B cells, particularly those expressing IgG, are fundamental to robust and long-lasting humoral immunity.
  • Further research into the molecular mechanisms governing isotype selection is essential for a comprehensive understanding of adaptive immunity.
  • Targeting specific memory B cell populations and their associated isotypes may offer novel therapeutic strategies for infectious diseases and autoimmune disorders.