Referencia

Nature Communications 8, Article number: 16067 (2017) doi:10.1038/ncomms16067 naturensp 420

Autores

Arantxa Pérez-García, Ester Marina-Zárate, Ángel F. Álvarez-Prado, Jose M. Ligos, Niels Galjart & Almudena R. Ramiro

Resumen

In germinal centres (GC) mature B cells undergo intense proliferation and immunoglobulin gene modification before they differentiate into memory B cells or long-lived plasma cells (PC). GC B-cell-to-PC transition involves a major transcriptional switch that promotes a halt in cell proliferation and the production of secreted immunoglobulins. Here we show that the CCCTC-binding factor (CTCF) is required for the GC reaction in vivo, whereas in vitro the requirement for CTCF is not universal and instead depends on the pathways used for B-cell activation. CTCF maintains the GC transcriptional programme, allows a high proliferation rate, and represses the expression of Blimp-1, the master regulator of PC differentiation. Restoration of Blimp-1 levels partially rescues the proliferation defect of CTCF-deficient B cells. Thus, our data reveal an essential function of CTCF in maintaining the GC transcriptional programme and preventing premature PC differentiation.

Descripción

En el estudio se analizó si el regulador transcripcional CTCF podía jugar un papel en el programa de diferenciación del centro germinal. Se encontró que en ausencia de CTCF, los ratones son incapaces de desarrollar centros germinales en respuesta a inmunización. En ensayos in vitro y mediante técnicas de secuenciación masiva de ARN, se ha descubierto que los linfocitos B deficientes en CTCF tienen su programa transcripcional profundamente alterado, de manera que muchos de los genes no se expresan como sería esperable en células de centro germinal, sino que por el contrario, se asemejan al de células plasmáticas. Por lo tanto, el estudio revela una función esencial de CTCF orquestando los cambios transcripcionales de la diferenciación terminal del linfocito B y contribuye a entender mejor los mecanismos que regulan la respuesta inmune.

 

 

foto de grupo 1

 

REFERENCIA DEL GRUPO INVESTIGADOR

El grupo de investigación ‘Biología de los linfocitos B’ liderado por la Dra. Almudena Ramiro centra su estudio en los mecanismos reguladores y de diversificación que tienen lugar en los centros germinales durante una respuesta inmune, además de interesarse por los procesos linfomagénicos y autoinmunes asociados a los linfocitos B.

Ver más de este artículo aquí.

¿Acabas de publicar un artículo interesante?

Manda la referencia a través de nuestro formulario.  Límite de edad 32 años. Los artículos seleccionados serán destacados como artículos del mes y participarán en el Premio al mejor artículo de jóvenes de la SEBBM, que se entregará en el congreso de la SEBBM (inscripción y alojamiento gratuitos).

Otros "Artículos del mes"

A Mammalian Target of Rapamycin-Perilipin 3 (mTORC1-Plin3) Pathway is essential to Activate Lipophagy and Protects Against Hepatosteatosis

24-09-2021

Background and Aims: NAFLD is the most common hepatic pathology in western countries and no treatment is currently available. NAFLD is characterized by the aberrant hepatocellular accumulation of fatty acids...

Leer más

NF-κB/IKK activation by small extracellular vesicles within the SASP

07-09-2021

Cellular senescence plays an important role in different biological and pathological conditions. Senescent cells communicate with their microenvironment through a plethora of soluble factors, metalloproteases and extracellular vesicles (EV). Although...

Leer más

α-Helical peptidic scaffolds to target α-synuclein toxic species with nanomolar affinity

28-07-2021

α-Synuclein aggregation is a key driver of neurodegeneration in Parkinson's disease and related syndromes. Accordingly, obtaining a molecule that targets α-synuclein toxic assemblies with high affinity is a long-pursued objective...

Leer más

Neutrophil infiltration regulates clock-gene expression to organize daily hepatic metabolism

30-06-2021

Liver metabolism follows diurnal fluctuations through the modulation of molecular clock genes. Disruption of this molecular clock can result in metabolic disease but its potential regulation by immune cells remains...

Leer más

G6PD overexpression protects from oxidative stress and age-related hearing loss

23-05-2021

Aging of the auditory system is associated with the incremental production of reactive oxygen species (ROS) and the accumulation of oxidative damage in macromolecules, which contributes to cellular malfunction, compromises...

Leer más

Renal tubule Cpt1a overexpression protects from kidney fibrosis by restoring mitochondrial homeostasis

25-04-2021

Chronic kidney disease (CKD) remains a major epidemiological, clinical, and biomedical challenge. During CKD, renal tubular epithelial cells (TECs) present a persistent inflammatory and profibrotic response. Fatty acid oxidation (FAO)...

Leer más

Astrocyte-mediated switch in spike timing-dependent plasticity during hippocampal development

29-03-2021

Presynaptic spike timing-dependent long-term depression (t-LTD) at hippocampal CA3-CA1 synapses is evident until the 3rd postnatal week in mice, disappearing during the 4th week. At more mature stages, we found...

Leer más

Ceramide chain length–dependent protein sorting into selective endoplasmic reticulum exit sites

22-02-2021

Protein sorting in the secretory pathway is crucial to maintain cellular compartmentalization and homeostasis. In addition to coat-mediated sorting, the role of lipids in driving protein sorting during secretory transport...

Leer más

Antigen retrieval and clearing for whole-organ immunofluorescence by FLASH

25-01-2021

Advances in light-sheet and confocal microscopy now allow imaging of cleared large biological tissue samples and enable the 3D appreciation of cell and protein localization in their native organ environment...

Leer más

Viral Bcl2s' transmembrane domain interact with host Bcl2 proteins to control cellular apoptosis

08-01-2021

Viral control of programmed cell death relies in part on the expression of viral analogs of the B-cell lymphoma 2 (Bcl2) protein known as viral Bcl2s (vBcl2s). vBcl2s control apoptosis...

Leer más

Socios Protectores