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Related Concept Videos

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
Hybridoma Technology01:31

Hybridoma Technology

Hybridoma technology is used for the large-scale production of monoclonal antibodies. Monoclonal antibodies bind to only a single antigenic determinant or epitope. Such antibodies are used in research, diagnostics, and disease therapy. The hybridoma technology established in 1975 by Georges Köhler and Cesar Milstein was awarded the Nobel Prize in Medicine in 1984 for revolutionizing research and therapy.
Hybridoma Selection
Commonly used fusion techniques — electroporation, polyethylene glycol...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...

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Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production
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B-1 B lymphocytes require Blimp-1 for immunoglobulin secretion.

David Savitsky1, Kathryn Calame

  • 1Department of Biological Sciences, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.

The Journal of Experimental Medicine
|September 7, 2006
PubMed
Summary

B lymphocyte-induced maturation protein 1 (Blimp-1) is crucial for B-1 cell antibody secretion, not their development. Blimp-1 deficiency impairs B-1 cell function and early protection against influenza.

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Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production
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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B-1 B cells produce natural antibodies for innate-like immunity against pathogens.
  • B lymphocyte-induced maturation protein 1 (Blimp-1) is essential for B-2 plasma cell development.

Purpose of the Study:

  • To investigate the role of Blimp-1 in B-1 cell biology and function.
  • To determine if Blimp-1 is required for B-1 cell formation, self-renewal, and immunoglobulin secretion.

Main Methods:

  • Utilized genetically modified mice lacking Blimp-1 specifically in the B cell lineage.
  • Analyzed B-1 cell populations for formation, self-renewal, and immunoglobulin secretion.
  • Assessed the expression of key genes involved in immunoglobulin secretion, including Pax5 and X-box binding protein 1.
  • Evaluated the protective capacity of Blimp-1-deficient B-1 cells against influenza infection.

Main Results:

  • Blimp-1 is not essential for the formation or self-renewal of B-1 B cells.
  • Blimp-1 is required for normal immunoglobulin secretion by B-1 cells.
  • Blimp-1-deficient B-1 cells fail to repress Pax5 mRNA and do not induce mu secreted mRNA normally.
  • These cells exhibit defects in providing early protection against influenza infection.

Conclusions:

  • Blimp-1 plays a critical role in regulating immunoglobulin secretion in B-1 cells, distinct from its role in B-2 cells.
  • B-1 and B-2 cells share a common pathway for immunoglobulin secretion regulated by Blimp-1.
  • Blimp-1 deficiency in B-1 cells compromises innate-like immune responses and protection against viral infections.