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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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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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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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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 innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Postnatal Innate Immune Development: From Birth to Adulthood.

Anastasia Georgountzou1, Nikolaos G Papadopoulos1,2

  • 1Allergy and Clinical Immunology Unit, 2nd Pediatric Clinic, National and Kapodistrian University of Athens, Athens, Greece.

Frontiers in Immunology
|August 30, 2017
PubMed
Summary

The innate immune system develops uniquely in early life, with responses varying by age and specific triggers. Understanding this development is key to preventing inflammatory diseases like allergies.

Keywords:
immune trajectoriesimmune-related diseasesinnate immunityinnate ontogenypostnatal development

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Area of Science:

  • Immunology
  • Developmental Biology
  • Pediatrics

Background:

  • Adaptive immunity is known to be underdeveloped in early life, leading to higher disease risks.
  • The maturation patterns of innate immunity components are complex and vary by anatomical site.
  • Cytokine responses in early life are specific to age and toll-like receptor stimulation, influenced by genetics and environment.

Purpose of the Study:

  • To review the current understanding of postnatal innate immune ontogeny.
  • To identify critical research gaps in innate immune development.
  • To explore factors influencing innate immune maturation and disease susceptibility.

Main Methods:

  • Literature review of studies on innate immune development in early life.
  • Analysis of data on cytokine responses and toll-like receptor specificity.
  • Examination of environmental and genetic influences on immune maturation.

Main Results:

  • Innate immune responses show variable maturation trajectories across different cells, molecules, and signaling pathways.
  • Cytokine production during early life is age-dependent and toll-like receptor-specific.
  • Environmental exposures can modify innate immune function and are linked to chronic inflammatory conditions.

Conclusions:

  • Further research into innate immune ontogeny is crucial for understanding and intervening in diseases like respiratory allergies.
  • Understanding the interplay of genetic and environmental factors is essential for predicting and preventing immune-related disorders.
  • Expanding knowledge on postnatal innate immune development will facilitate the development of targeted interventions.