Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Filtrar
Más filtros

Banco de datos
Tipo de estudio
Tipo del documento
País de afiliación
Intervalo de año de publicación
1.
Cell ; 139(4): 791-801, 2009 Nov 13.
Artículo en Inglés | MEDLINE | ID: mdl-19914171

RESUMEN

Understanding how cells polarize and coordinate tubulogenesis during organ formation is a central question in biology. Tubulogenesis often coincides with cell-lineage specification during organ development. Hence, an elementary question is whether these two processes are independently controlled, or whether proper cell specification depends on formation of tubes. To address these fundamental questions, we have studied the functional role of Cdc42 in pancreatic tubulogenesis. We present evidence that Cdc42 is essential for tube formation, specifically for initiating microlumen formation and later for maintaining apical cell polarity. Finally, we show that Cdc42 controls cell specification non-cell-autonomously by providing the correct microenvironment for proper control of cell-fate choices of multipotent progenitors. For a video summary of this article, see the PaperFlick file with the Supplemental Data available online.


Asunto(s)
Proteínas Activadoras de GTPasa/metabolismo , Organogénesis , Páncreas/embriología , Animales , Polaridad Celular , Células Epiteliales/metabolismo , Laminina/metabolismo , Ratones , Ratones Noqueados , Páncreas/citología , Páncreas/metabolismo , Páncreas Exocrino/citología , Páncreas Exocrino/embriología , Páncreas Exocrino/metabolismo , Células Madre/metabolismo , Quinasas Asociadas a rho/metabolismo
2.
Clin Sci (Lond) ; 137(13): 995-1011, 2023 07 14.
Artículo en Inglés | MEDLINE | ID: mdl-37384590

RESUMEN

Mice with deletion of Cyp2c70 have a human-like bile acid composition, display age- and sex-dependent signs of hepatobiliary disease and can be used as a model to study interactions between bile acids and the gut microbiota in cholestatic liver disease. In the present study, we rederived Cyp2c70-/- mice as germ-free (GF) and colonized them with a human or a mouse microbiota to investigate whether the presence of a microbiota can be protective in cholangiopathic liver disease associated with Cyp2c70-deficiency. GF Cyp2c70-/- mice showed reduced neonatal survival, liver fibrosis, and distinct cholangiocyte proliferation. Colonization of germ-free breeding pairs with a human or a mouse microbiota normalized neonatal survival of the offspring, and particularly colonization with mouse microbiota from a conventionally raised mouse improved the liver phenotype at 6-10 weeks of age. The improved liver phenotype in conventionalized (CD) Cyp2c70-/- mice was associated with increased levels of tauro-ursodeoxycholic acid (TUDCA) and UDCA, resulting in a more hydrophilic bile acid profile compared with GF and humanized Cyp2c70-/- mice. The hydrophobicity index of biliary bile acids of CD Cyp2c70-/- mice was associated with changes in gut microbiota, liver weight, liver transaminases, and liver fibrosis. Hence, our results indicate that neonatal survival of Cyp2c70-/- mice seems to depend on the establishment of a gut microbiota at birth, and the improved liver phenotype in CD Cyp2c70-/- mice may be mediated by a larger proportion of TUDCA/UDCA in the circulating bile acid pool and/or by the presence of specific bacteria.


Asunto(s)
Ácidos y Sales Biliares , Microbioma Gastrointestinal , Hepatopatías , Animales , Femenino , Masculino , Ratones , Animales Recién Nacidos , Ácidos y Sales Biliares/metabolismo , Hepatopatías/metabolismo , Hepatopatías/mortalidad , Análisis de Supervivencia , Ratones Noqueados
3.
Development ; 141(3): 685-96, 2014 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-24449844

RESUMEN

Delamination plays a pivotal role during normal development and cancer. Previous work has demonstrated that delamination and epithelial cell movement within the plane of an epithelium are associated with a change in cellular phenotype. However, how this positional change is linked to differentiation remains unknown. Using the developing mouse pancreas as a model system, we show that ß cell delamination and differentiation are two independent events, which are controlled by Cdc42/N-WASP signaling. Specifically, we show that expression of constitutively active Cdc42 in ß cells inhibits ß cell delamination and differentiation. These processes are normally associated with junctional actin and cell-cell junction disassembly and the expression of fate-determining transcription factors, such as Isl1 and MafA. Mechanistically, we demonstrate that genetic ablation of N-WASP in ß cells expressing constitutively active Cdc42 partially restores both delamination and ß cell differentiation. These findings elucidate how junctional actin dynamics via Cdc42/N-WASP signaling cell-autonomously control not only epithelial delamination but also cell differentiation during mammalian organogenesis.


Asunto(s)
Actinas/metabolismo , Diferenciación Celular , Células Secretoras de Insulina/metabolismo , Células Secretoras de Insulina/patología , Transducción de Señal , Proteína Neuronal del Síndrome de Wiskott-Aldrich/metabolismo , Proteína de Unión al GTP cdc42/metabolismo , Animales , Animales Recién Nacidos , Embrión de Mamíferos/metabolismo , Embrión de Mamíferos/patología , Epitelio/metabolismo , Humanos , Hiperglucemia/metabolismo , Hiperglucemia/patología , Uniones Intercelulares/metabolismo , Uniones Intercelulares/patología , Ratones , Ratas , Imagen de Lapso de Tiempo
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA