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6.
Development ; 132(19): 4247-58, 2005 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-16120638

RESUMO

Numerous lines of evidence suggest that Notch signaling plays a pivotal role in controlling the production of neurons from progenitor cells. However, most experiments have relied on gain-of-function approaches because perturbation of Notch signaling results in death prior to the onset of neurogenesis. Here, we examine the requirement for Notch signaling in the development of the striatum through the analysis of different single and compound Notch1 conditional and Notch3 null mutants. We find that normal development of the striatum depends on the presence of appropriate Notch signals in progenitors during a critical window of embryonic development. Early removal of Notch1 prior to neurogenesis alters early-born patch neurons but not late-born matrix neurons in the striatum. We further show that the late-born striatal neurons in these mutants are spared as a result of functional compensation by Notch3. Notably, however, the removal of Notch signaling subsequent to cells leaving the germinal zone has no obvious effect on striatal organization and patterning. These results indicate that Notch signaling is required in neural progenitor cells to control cell fate in the striatum, but is dispensable during subsequent phases of neuronal migration and differentiation.


Assuntos
Corpo Estriado/embriologia , Receptor Notch1/fisiologia , Receptores Notch/fisiologia , Animais , Padronização Corporal , Corpo Estriado/metabolismo , Camundongos , Morfogênese , Mutação , Neurônios/fisiologia , Receptor Notch1/genética , Receptor Notch3 , Receptores Notch/genética , Transdução de Sinais , Células-Tronco/fisiologia
9.
Science ; 303(5661): 1179-81, 2004 Feb 20.
Artigo em Inglês | MEDLINE | ID: mdl-14976311

RESUMO

PTEN is a tumor suppressor protein that dephosphorylates phosphatidylinositol 3,4,5 trisphosphate and antagonizes the phosphatidylinositol-3 kinase signaling pathway. We show here that PTEN can also inhibit cell migration through its C2 domain, independent of its lipid phosphatase activity. This activity depends on the protein phosphatase activity of PTEN and on dephosphorylation at a single residue, threonine(383). The ability of PTEN to control cell migration through its C2 domain is likely to be an important feature of its tumor suppressor activity.


Assuntos
Movimento Celular/fisiologia , Monoéster Fosfórico Hidrolases/química , Monoéster Fosfórico Hidrolases/fisiologia , Proteínas Supressoras de Tumor/química , Proteínas Supressoras de Tumor/fisiologia , Animais , Células COS , Catálise , Domínio Catalítico , Linhagem Celular Tumoral , Chlorocebus aethiops , Glioma , Humanos , Mutação , PTEN Fosfo-Hidrolase , Fosfoproteínas Fosfatases/química , Fosfoproteínas Fosfatases/metabolismo , Monoéster Fosfórico Hidrolases/genética , Monoéster Fosfórico Hidrolases/metabolismo , Fosforilação , Fosfotreonina/metabolismo , Testes de Precipitina , Estrutura Terciária de Proteína , Proteínas Recombinantes/farmacologia , Deleção de Sequência , Transfecção , Proteínas Supressoras de Tumor/genética , Proteínas Supressoras de Tumor/metabolismo
10.
Dev Biol ; 265(1): 23-32, 2004 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-14697350

RESUMO

Rho GTPases control signal transduction pathways that link cell surface receptors to a variety of intracellular responses. They are best known as regulators of the actin cytoskeleton, but in addition they control cell polarity, gene expression, microtubule dynamics and vesicular trafficking. Through these diverse functions, Rho GTPases influence many aspects of cell behavior. This review will focus specifically on their role in cell migration.


Assuntos
Movimento Celular/fisiologia , Citoesqueleto/fisiologia , Transdução de Sinais/fisiologia , Proteínas rho de Ligação ao GTP/fisiologia , Actinas/metabolismo , Animais , Polaridade Celular/fisiologia , Citoesqueleto/metabolismo , Fosfatidilinositol 3-Quinases/metabolismo
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