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General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Na&#239;ve CD4+ T Cells Using a TGF-&#946;-containing Protocol
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Los nuevos programas de transcripción dependientes de Foxo1 controlan la función de las células T (((reg)

Weiming Ouyang1, Will Liao, Chong T Luo

  • 1Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.

Nature
|November 9, 2012
PubMed
Resumen
Este resumen es generado por máquina.

La caja O1 (Foxo1) es crucial para la función reguladora de las células T (Treg), manteniendo la homeostasis inmune. La eliminación de Foxo1 en las células Treg causa una inflamación grave, destacando su papel esencial más allá del compromiso inicial de las células Treg.

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In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol

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Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
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Published on: August 13, 2013

Área de la Ciencia:

  • Inmunología Inmunología.
  • Biología Molecular Biología Molecular
  • Biología celular Biología celular.

Sus antecedentes:

  • Las células T (Treg) reguladoras, marcadas por Foxp3, mantienen la homeostasis inmune al suprimir las respuestas inmunes.
  • Si bien los factores de transcripción Akt quinasa y Foxo regulan el compromiso temprano de las células Treg, su papel en la función de las células Treg maduras no está claro.

Objetivo del estudio:

  • Investigar el papel de las proteínas Foxo en la homeostasis de las células Treg y la función más allá de la etapa de compromiso.
  • Para determinar si Foxo1 regula la función de las células Treg y la homeostasis inmune.

Principales métodos:

  • Ratones generados con deleción específica de células Treg de Foxo1.1.
  • Se analizó la función de las células Treg, la homeostasis inmune y las respuestas inflamatorias.
  • Se realizó un análisis de todo el genoma de los sitios de unión de Foxo1.

Principales resultados:

  • Las células Treg exhiben altos niveles de Foxo1 y reducen la activación de Akt, la fosforilación de Foxo1 y la exclusión nuclear.
  • La deleción específica de Foxo1 en las células Treg condujo a una enfermedad inflamatoria fatal, similar a la deficiencia de Foxp3 pero sin pérdida de células Treg.
  • Se identificaron ~300 genes diana de Foxo1, incluyendo Ifng, no regulados directamente por Foxp3.

Conclusiones:

  • Foxo1 es un regulador crítico de la función de las células Treg y la homeostasis inmune.
  • La vía de señalización Akt-Foxo1 controla un nuevo programa genético esencial para la función de las células Treg.
  • Foxo1 juega un papel vital en el mantenimiento del equilibrio inmune, independiente del papel de Foxp3 en el número de células Treg.