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T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...

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Related Experiment Video

Updated: Jun 2, 2026

Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
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Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro

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Regulatory B cells control dendritic cell functions.

Richard Lo-Man1

  • 1Unite de Regulation Immunitaire et Vaccinologie, Institut Pasteur, Paris, France. richard.lo-man@pasteur.fr

Immunotherapy
|April 29, 2011
PubMed
Summary
This summary is machine-generated.

Regulatory B cells (Bregs) producing IL-10 dampen neonatal immune responses, challenging the immaturity hypothesis. These Bregs control inflammation and dendritic cell function, offering protective mechanisms against autoimmune diseases and chronic inflammation.

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Area of Science:

  • Immunology
  • Neonatal Immunology
  • Regulatory Cell Biology

Background:

  • Regulatory B cells (Bregs) producing Interleukin-10 (IL-10) are recognized for controlling immune responses.
  • Neonatal immune responses to vaccines and adjuvants are often dampened, traditionally attributed to immune immaturity.
  • Emerging evidence suggests immune regulation, not immaturity, underlies these neonatal phenomena.

Purpose of the Study:

  • To investigate the role of IL-10-producing Bregs in the neonatal immune system.
  • To elucidate the mechanisms by which Bregs modulate innate and adaptive immunity in neonates.
  • To explore the potential therapeutic applications of Bregs in inflammatory and autoimmune conditions.

Main Methods:

  • Analysis of innate CD5(+) Bregs in neonatal mice.
  • Assessment of IL-10 production by Bregs following Toll-like receptor (TLR) triggering.
  • Evaluation of Breg-mediated control of innate inflammation and dendritic cell function.
  • Modeling of autoimmune diseases (experimental autoimmune encephalomyelitis) and chronic inflammatory states.

Main Results:

  • Innate CD5(+) Bregs were shown to negatively control innate inflammation and dendritic cell functions in neonatal mice.
  • High levels of IL-10 production by Bregs were observed following TLR triggering.
  • These regulatory mechanisms demonstrated protective effects against lethal inflammation.
  • Breg activity was implicated in controlling experimental autoimmune encephalomyelitis development.

Conclusions:

  • Immune regulation by IL-10-producing Bregs, rather than immaturity, explains dampened neonatal immune responses.
  • These Bregs play a critical role in maintaining immune homeostasis in neonates.
  • The findings suggest potential therapeutic strategies involving Bregs for autoimmune diseases and chronic inflammatory conditions like cancer.