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Related Concept Videos

Cells of the Adaptive Immune Response01:23

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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 development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
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Immunity is a crucial biological concept about our body's inherent capacity to prevent infections and diseases. A complex network of cells and tissues collectively known as the immune system facilitates this natural defense mechanism. The immune system plays an integral role in maintaining our health and well-being, shielding us from potential health threats.
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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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Innate lymphoid cell development.

Maryam Ghaedi1, Fumio Takei2

  • 1Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.

The Journal of Allergy and Clinical Immunology
|May 9, 2021
PubMed
Summary

Innate lymphoid cells (ILCs) develop from progenitors in bone marrow and peripheral tissues. This review details their differentiation, critical developmental windows, and origins for tissue immunity.

Keywords:
ILCsInnate lymphoid cellsdevelopmentprogenitorstranscription factors

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Area of Science:

  • Immunology
  • Developmental Biology

Background:

  • Innate lymphoid cells (ILCs) are crucial immune cells at barrier surfaces, regulating homeostasis and immunity.
  • ILCs are classified into three groups (ILC1, ILC2, ILC3) based on effector functions mirroring T cells.
  • ILC development from progenitors in adult mouse bone marrow is well-studied, with identified progenitors in peripheral tissues.

Purpose of the Study:

  • To review the stepwise differentiation of mouse ILC progenitors into mature ILCs.
  • To highlight critical time windows during ILC development.
  • To discuss the relative contributions of bone marrow and tissue-derived ILC progenitors to the mature ILC pool.

Main Methods:

  • This review synthesizes existing research on ILC development.
  • Focuses on transcription factor-directed differentiation pathways.
  • Examines studies identifying ILC progenitors in bone marrow and peripheral tissues.

Main Results:

  • ILC development is a stepwise process guided by specific transcription factors.
  • Distinct critical time windows exist for ILC development.
  • Both bone marrow and peripheral tissues serve as sources for ILC progenitors.

Conclusions:

  • Understanding ILC progenitor origins and differentiation is key to their role in immunity.
  • Perinatal development and tissue residency are significant aspects of ILC biology.
  • Further research into ILC progenitor contributions can inform immune regulation strategies.