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Immunological Memory01:23

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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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...
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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Opsonophagocytic Killing Assay to Assess Immunological Responses Against Bacterial Pathogens
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Memory B cells and pneumococcal antibody after splenectomy.

Heather Wasserstrom1, James Bussel, Lony C-L Lim

  • 1Departments of Medicine, Pediatrics and the Immunology Institute, Mount Sinai Medical Center, New York City, NY 10029, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 21, 2008
PubMed
Summary

Splenectomy may not solely cause reduced IgM antibody levels and memory B cells. Age-related loss of immune function in extra-splenic sites could be a factor in impaired immunity post-splenectomy.

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Area of Science:

  • Immunology
  • Microbiology

Background:

  • Splenectomized patients face increased risk of infections from encapsulated bacteria.
  • Reduced antibody (Ab) production, particularly IgM, is observed post-splenectomy.
  • This may be linked to fewer IgM-positive CD27-positive memory B cells.

Purpose of the Study:

  • To investigate the relationship between memory B cell subsets and antibody responses in vaccinated splenectomized individuals compared to healthy controls.
  • To determine if splenectomy alone or other factors contribute to impaired B cell function and antibody production.

Main Methods:

  • Analysis of CD27+ memory B cell subsets, IgG, and IgM pneumococcal Ab responses.
  • Comparison between 26 vaccinated splenectomized subjects (autoimmunity and spherocytosis) and healthy controls.

Main Results:

  • Splenectomized autoimmune subjects had fewer total, isotype-switched, and IgM+ CD27+ memory B cells than controls.
  • No significant difference in memory B cell subsets was found between controls and splenectomized subjects with spherocytosis.
  • IgG Ab responses did not differ between groups. IgM Ab production was lower in splenectomized autoimmune subjects compared to controls, but similar to subjects with spherocytosis.
  • No correlation was observed between memory B cell subsets and Ab responses.

Conclusions:

  • Splenectomy alone may not fully explain the observed reduction in memory B cells and IgM antipneumococcal Ab.
  • Age-related decline in extra-splenic immune cell function might contribute to impaired immunity in older splenectomized patients.
  • Further research is needed to elucidate the complex factors affecting immune function after splenectomy.