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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 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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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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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
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Related Experiment Video

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Bcl11b is essential for group 2 innate lymphoid cell development.

Jennifer A Walker1, Christopher J Oliphant2, Alexandros Englezakis2

  • 1Medical Research Council (MRC) Laboratory of Molecular Biology, Cambridge CB2 0QH, England, UK jwalker@mrc-lmb.cam.ac.uk anm@mrc-lmb.cam.ac.uk.

The Journal of Experimental Medicine
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Bcl11b is essential for the development of group 2 innate lymphoid cells (ILC2s), which are crucial for immune responses at mucosal surfaces. Its absence impairs ILC2 function and impacts protective immunity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Group 2 innate lymphoid cells (ILC2s) are key players in mucosal immunity, allergic responses, and tissue repair.
  • The developmental pathways and regulatory factors governing ILC2 differentiation are not fully understood.

Purpose of the Study:

  • To investigate the role of Bcl11b, a transcription factor implicated in T cell development, in the differentiation of ILC2s.
  • To elucidate the specific lineage path and transcriptional regulators involved in ILC2 development.

Main Methods:

  • Gene expression analysis of ILC2s.
  • Utilized Bcl11b-tom and Id2-gfp reporter mice for tracking Bcl11b expression.
  • In vivo conditional depletion of Bcl11b and fetal liver chimera reconstitution models.
  • Infection models using Nippostrongylus brasiliensis and Citrobacter rodentium.

Main Results:

  • Bcl11b is expressed in ILC2 precursors and mature ILC2s.
  • ILC2 development is entirely dependent on Bcl11b, as demonstrated by in vivo deletion studies.
  • Absence of Bcl11b leads to an expansion of the RORγt(+) ILC3 population, suggesting negative regulation.
  • Impaired worm expulsion in Nippostrongylus brasiliensis infection due to ILC2 deficiency, while Citrobacter rodentium infection clearance remains efficient.

Conclusions:

  • Bcl11b is a critical transcription factor for ILC2 differentiation.
  • Bcl11b plays a role in regulating the balance between ILC2 and ILC3 populations.
  • Bcl11b is essential for protective immunity mediated by ILC2s during helminth infections.