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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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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.
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Dose-Response Relationship: Selectivity and Specificity01:25

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and...
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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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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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Related Experiment Video

Updated: Feb 22, 2026

Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry
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Demographically framing trade-offs between sensitivity and specificity illuminates selection on immunity.

C Jessica E Metcalf1,2, Ann T Tate3, Andrea L Graham4

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. cmetcalf@princeton.edu.

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Summary

The immune system must balance attacking pathogens with avoiding self-attack. Optimal immune sensitivity shifts with risks of infection versus autoimmune disease, influencing evolved defenses across lifespan.

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Epidemiology

Background:

  • The immune system faces a critical challenge: distinguishing between threats requiring activation and situations where activation would be detrimental.
  • Failure to identify pathogens leads to infectious diseases, while misidentifying self results in immunopathology, both carrying severe fitness costs.

Purpose of the Study:

  • To apply epidemiological tools to model the trade-off between immune sensitivity and specificity.
  • To explore the evolutionary implications of immune discrimination under varying mortality risks.

Main Methods:

  • Utilized classic epidemiological models to analyze immune activation trade-offs.
  • Examined how pathogen mortality risk and immunopathology mortality risk influence optimal immune sensitivity.

Main Results:

  • Optimal immune sensitivity increases with higher pathogen mortality risk.
  • Optimal immune sensitivity decreases with increased immunopathology mortality risk.
  • Counterintuitively, optimal sensitivity decreases with increasing lifespan and in later life stages, independent of immunosenescence.

Conclusions:

  • Immune discrimination strategies are shaped by epidemiological contexts and mortality risks.
  • Life expectancy and age-specific immune priorities significantly impact evolved immune defenses.
  • Future research must integrate epidemiological settings and lifestage-specific immune needs to understand immune evolution.