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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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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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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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T Cell Activation and Clonal Selection01:22

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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...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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.
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...
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Defense Against Bacterial Pathogens01:31

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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
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Updated: May 2, 2026

Unraveling Key Players of Humoral Immunity: Advanced and Optimized Lymphocyte Isolation Protocol from Murine Peyer's Patches
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Selección del BCR y maduración de la afinidad en los centros germinales del parche de Peyer

Huan Chen1,2,3, Yuxiang Zhang1,2,3, Adam Yongxin Ye1,2,3

  • 1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA.

Nature
|June 6, 2020
PubMed
Resumen

La microbiota intestinal influye en los repertorios de receptores de células B en los parches de Peyer del ratón, seleccionando anticuerpos clonotípicos específicos reactivos a los glicanos bacterianos. Esta investigación revela cómo los antígenos intestinales persistentes impulsan las respuestas crónicas del centro germinal y la maduración de la afinidad de los anticuerpos.

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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Área de la Ciencia:

  • Inmunología
  • Microbiología
  • La genética

Sus antecedentes:

  • Los receptores de células B (BCR) y los anticuerpos son cruciales para las respuestas inmunológicas, con su diversidad generada por la recombinación V(D) J.
  • Los centros germinales (GC) son sitios de maduración de células B, pero las GC crónicas en los parches de Peyer (PP) y sus repertorios de BCR siguen siendo poco conocidos.
  • La microbiota intestinal tiene un impacto significativo en la inmunidad intestinal, incluido el desarrollo de PP.

Objetivo del estudio:

  • Para elucidar los repertorios fisiológicos de BCR y los patrones de hipermutación somática en ratones PP GC.
  • Investigar el papel de la microbiota intestinal en la configuración de los repertorios de BCR dentro de los PP.
  • Comprender los mecanismos de selección y los procesos de maduración de la afinidad en las GC crónicas de PP.

Principales métodos:

  • Secuenciación de alto rendimiento para analizar el uso del segmento V(D) J y los perfiles de hipermutación somática en GC de ratón PP.
  • Análisis comparativo de los repertorios de BCR en ratones con y sin microbiota intestinal específica.
  • Experimentos de transferencia de microbiota fecal de ratones libres de patógenos específicos a ratones libres de gérmenes.

Principales resultados:

  • Los GC de ratón PP expanden los clonotipos de BCR públicos con CDR3 canónicos, frecuentemente observados debido a sesgos de unión en la recombinación V(D) J.
  • Algunos clonotipos públicos son dependientes de la microbiota y codifican anticuerpos reactivos a los glicanos bacterianos, mientras que otros son independientes.
  • La transferencia fecal restauró los clonotipos dependientes de los gérmenes, implicando directamente la selección de BCR por la microbiota intestinal. Las hipermutaciones somáticas recurrentes indican una maduración de afinidad en los GC de PP.

Conclusiones:

  • Los antígenos intestinales persistentes seleccionan los clonotipos recurrentes de BCR, sembrando respuestas crónicas de PP GC.
  • La microbiota intestinal juega un papel crítico en la configuración de los repertorios BCR y las respuestas inmunes en los parches de Peyer.
  • La maduración de la afinidad ocurre en GCs PP de ratón bajo condiciones homeostáticas, impulsadas por la selección de antígenos.