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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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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Special Features of Adaptive Immunity01:20

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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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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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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 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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Continuous immunotypes describe human immune variation and predict diverse responses.

Kevin J Kaczorowski1,2,3, Karthik Shekhar4, Dieudonné Nkulikiyimfura5

  • 1Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
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PubMed
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Human immune variation is continuous, defined by three key immune cell combinations forming an individual's immunotype. This immunotype predicts functional responses and highlights age and cytomegalovirus status as key influencing factors.

Keywords:
aginghuman immune variationimmune cell compositionsystems immunology

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Area of Science:

  • Immunology
  • Human Physiology
  • Systems Biology

Background:

  • The human immune system comprises diverse, communicating cell populations crucial for systemic responses.
  • Understanding immune system variation is key to personalized medicine and effective immunotherapies.
  • Previous research often categorized immune profiles into discrete groups.

Purpose of the Study:

  • To analyze immune cell population frequencies and functional responses in healthy humans.
  • To determine if human immune variation is continuous or discrete.
  • To define a framework for classifying individual immune profiles (immunotypes) and their predictive capacity.

Main Methods:

  • Analysis of measured immune cell population frequencies in a cohort of healthy individuals.
  • Assessment of immune cell responses to various stimuli, including cytokine stimulation.
  • Statistical modeling to identify key combinations of cell frequencies defining immunotypes.

Main Results:

  • Human immune variation is continuous, not characterized by discrete groups.
  • Three key combinations of immune cell frequencies define an individual's immunotype.
  • Immunotypes predict functional responses to cytokine stimulation.
  • Younger individuals exhibit more homogeneous immunotypes than older individuals.
  • Cytomegalovirus seropositivity is associated with immunotypes characteristic of older individuals.

Conclusions:

  • A continuous model of human immune variation, defined by immunotypes, is proposed.
  • Immunotypes offer a framework for understanding and predicting immune responses.
  • This framework could guide the development of targeted immunotherapies modulating collective immune profiles.