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The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
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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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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Related Experiment Video

Updated: Apr 16, 2026

Unraveling Key Players of Humoral Immunity: Advanced and Optimized Lymphocyte Isolation Protocol from Murine Peyer's Patches
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Peyer's patch innate lymphoid cells regulate commensal bacteria expansion.

Masaaki Hashiguchi1, Yuji Kashiwakura1, Hidefumi Kojima1

  • 1Department of Immunology, Dokkyo Medical University School of Medicine, Mibu, Tochigi 321-0293, Japan.

Immunology Letters
|March 22, 2015
PubMed
Summary

Innate lymphoid cells (ILCs) in the gut prevent bacterial overgrowth. These ILCs produce key cytokines that control commensal bacteria, maintaining intestinal homeostasis.

Keywords:
Commensal bacteriaIL-22Innate lymphoid cellPeyer's patch

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Microscopic Observation of Lymphocyte Dynamics in Rat Peyer's Patches
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Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Innate lymphoid cells (ILCs) are crucial for maintaining intestinal mucosal integrity.
  • The precise mechanisms by which ILCs regulate commensal bacteria localization remain unclear.

Purpose of the Study:

  • To elucidate the role of Peyer's patch (PP) ILCs in controlling commensal bacterial populations.
  • To investigate the molecular mechanisms underlying ILC-mediated bacterial containment.

Main Methods:

  • Analysis of IL-22 and IFN-γ production by PP ILCs in mice.
  • Assessment of ILC function following antibiotic treatment and cytokine signaling blockade (IL-2, IL-23).
  • Evaluation of antibacterial protein expression (RegIIIβ, RegIIIγ) in intestinal epithelial cells.
  • In vivo depletion of ILCs and T cells to study effects on bacterial composition and localization.

Main Results:

  • PP ILCs spontaneously produce significant amounts of IL-22 and IFN-γ.
  • Antibiotic treatment and blockade of IL-2/IL-23 signaling reduced IL-22 and IFN-γ production by PP ILCs.
  • PP ILCs induce the expression of antibacterial proteins RegIIIβ and RegIIIγ in intestinal epithelial cells.
  • Depletion of ILCs, but not T cells, led to altered gut bacterial composition and proliferation within PPs.

Conclusions:

  • ILCs are essential regulators of commensal bacterial expansion within Peyer's patches.
  • ILC-derived IL-22 and IFN-γ play a critical role in inducing antibacterial defenses.
  • These findings highlight a key mechanism by which the innate immune system maintains gut homeostasis.