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T Cell Types and Functions01:24

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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.
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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.
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B Cell Activation and Differentiation01:24

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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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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Video Experimental Relacionado

Updated: Jun 10, 2025

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
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La señalización de neuropéptidos orquesta la diferenciación de las células T

Yu Hou1,2,3, Linyu Sun1,3, Martin W LaFleur1,4

  • 1Gene Lay Institute of Immunology and Inflammation, Brigham and Women's Hospital, Mass General Hospital and Harvard Medical School, Boston, MA, USA.

Nature
|October 16, 2024
PubMed
Resumen

Las neuronas regulan la diferenciación de las células T auxiliares 1 (TH1) a través del neuropéptido CGRP. Este circuito neuroinmune mejora las respuestas antivirales promoviendo la actividad de las células TH1 durante la infección.

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Área de la Ciencia:

  • Inmunología
  • La neurociencia
  • Biología molecular

Sus antecedentes:

  • El equilibrio entre las células T auxiliares 1 (TH1) y otros subconjuntos de células TH es crucial para una inmunidad antiviral y antitumoral efectiva.
  • Los mecanismos precisos que rigen la diferenciación celular TH1 siguen siendo incompletamente entendidos.

Objetivo del estudio:

  • Investigar la regulación dinámica de la diferenciación celular TH1 in vitro y in vivo.
  • Identificar los reguladores clave de la determinación del destino de las células TH1.

Principales métodos:

  • Se utilizó un sistema de cultivo celular dicotómico TH1-TH2 para la identificación del regulador.
  • Se emplean pantallas CRISPR in vitro e in vivo para la validación sistemática de las funciones reguladoras.
  • Se analizó el papel de la proteína 3 modificadora de la actividad de los receptores (RAMP3) y la señalización del péptido relacionado con el gen de la calcitonina (CGRP).

Principales resultados:

  • RAMP3 juega un papel intrínseco de la célula en la diferenciación celular TH1.
  • La señalización extracelular de CGRP a través del receptor RAMP3-CALCRL restringe TH2 y promueve la diferenciación TH1 a través de la activación de CREB y ATF3.
  • ATF3 induce la expresión de Stat1, un regulador crítico de TH1.
  • El CGRP neuronal interactúa con la RAMP3 de las células T durante la infección viral, mejorando las respuestas antivirales de las células TH1 y CD8+.

Conclusiones:

  • Se identificó un circuito neuroinmune que involucra CGRP neuronal y RAMP3 de células T en la determinación del destino de las células TH1.
  • Se demostró que la señalización de CGRP promueve la diferenciación TH1 y mejora la inmunidad antiviral.
  • Se estableció un nuevo mecanismo para la participación neuronal en respuestas inmunes adaptativas durante las infecciones virales.