Transcriptional regulation of FOXP3 requires integrated activation of both promoter and CNS regions in tumor-induced CD8+ Treg cells

Abstract T-regulatory cells are an upsurge in the tumor microenvironment and induce immune-evasion. CD4+ Treg cells are well characterized whereas the role of CD8+ Tregs in cancer has recently started to crease attention. Here, we report an augmentation CD8+FOXP3+ Tregs in breast tumor microenvironm...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Sreeparna Chakraborty, Abir K. Panda, Sayantan Bose, Dia Roy, Kirti Kajal, Deblina Guha, Gaurisankar Sa
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
Materias:
R
Q
Acceso en línea:https://doaj.org/article/b98775057ebd4917908002096e8aef98
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
Descripción
Sumario:Abstract T-regulatory cells are an upsurge in the tumor microenvironment and induce immune-evasion. CD4+ Treg cells are well characterized whereas the role of CD8+ Tregs in cancer has recently started to crease attention. Here, we report an augmentation CD8+FOXP3+ Tregs in breast tumor microenvironment. FOXP3, the lineage-specific transcription factor, is a dominant regulator of Treg cell development and function. FOXP3 is induced preferentially by divergent signaling in CD4+ Treg cells. But how FOXP3 is induced and maintained in tumor-CD8+ Tregs is the Cinderella of the investigation. We observed that RUNX3, a CD8+ lineage-specific transcription factor, binds at the FOXP3-promoter to induce its transcription. In addition to promoter activation, involvement of cis-elements CNS1 and CNS2 in the transcriptional regulation of FOXP3 was also evident in these cells. SMAD3 binds to CNS1 region and acts as transcription inducer, whereas GATA3 plays a temporal role in the FOXP3 transcription by differential chromatin modification in CNS regions. In CNS1 region, GATA3 acts as a repressor for FOXP3 in naïve CD8+ T cells. Whereas in CD8+ Tregs, GATA3 binds directly at CNS2 region and persuaded the maintenance of FOXP3. Therefore, the intervention of these concerted transcriptional machinery may have a therapeutic potential in immunotherapy of cancer.