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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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Special Features of Adaptive Immunity01:20

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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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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Remembering Pathogen Dose: Long-Term Adaptation in Innate Immunity.

Michael Bauer1, Sebastian Weis2, Mihai G Netea3

  • 1Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Jena, Germany; Integrated Research and Treatment Center, Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.

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Innate immune cells show memory-like responses, adapting to pathogen exposure. Pathogen dose, not just type, influences immune training or tolerance, impacting infectious disease outcomes.

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Area of Science:

  • Immunology
  • Infectious Disease Research
  • Cellular Biology

Background:

  • Innate immune system exhibits memory-like adaptive responses to sequential pathogen exposure.
  • Reported responses include immune sensitization (training) and desensitization (tolerance).
  • Previous research emphasized pathogen type, but pathogen dose's role is under-explored.

Purpose of the Study:

  • To investigate the role of pathogen dose in innate immune memory responses.
  • To propose a dose-dependent model for immune training and tolerance.
  • To explore the influence of environmental stressors on these adaptive immune responses.

Main Methods:

  • Analysis of recent investigations on innate immune responses to sequential pathogen challenge.
  • Conceptual framework development based on pathogen dose as a key determinant.
  • Hypothesizing hormetic responses of immune cells to pathogens and stressors.

Main Results:

  • Pathogen dose, alongside pathogen type, significantly influences innate immune training and tolerance.
  • Innate immune cell training and tolerance are adaptive responses to increasing pathogen load.
  • Environmental stressors modulate pathogen-induced innate immune cell responses.

Conclusions:

  • Pathogen dose is a critical factor in determining innate immune memory-like responses (training vs. tolerance).
  • Innate immune responses to pathogens may follow a hormetic pattern, similar to other stressors.
  • Understanding dose-response relationships is crucial for explaining infectious disease dynamics and host-pathogen interactions.