Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 24
Filtrar
1.
Development ; 147(24)2020 12 21.
Artigo em Inglês | MEDLINE | ID: mdl-33144399

RESUMO

Sense organs acquire their distinctive shapes concomitantly with the differentiation of sensory cells and neurons necessary for their function. Although our understanding of the mechanisms controlling morphogenesis and neurogenesis in these structures has grown, how these processes are coordinated remains largely unexplored. Neurogenesis in the zebrafish olfactory epithelium requires the bHLH proneural transcription factor Neurogenin 1 (Neurog1). To address whether Neurog1 also controls morphogenesis, we analysed the migratory behaviour of early olfactory neural progenitors in neurog1 mutant embryos. Our results indicate that the oriented movements of these progenitors are disrupted in this context. Morphogenesis is similarly affected by mutations in the chemokine receptor gene, cxcr4b, suggesting it is a potential Neurog1 target gene. We find that Neurog1 directly regulates cxcr4b through an E-box cluster located just upstream of the cxcr4b transcription start site. Our results suggest that proneural transcription factors, such as Neurog1, directly couple distinct aspects of nervous system development.


Assuntos
Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética , Morfogênese/genética , Proteínas do Tecido Nervoso/genética , Neurogênese/genética , Mucosa Olfatória/crescimento & desenvolvimento , Receptores CXCR4/genética , Proteínas de Peixe-Zebra/genética , Animais , Elementos E-Box/genética , Embrião não Mamífero , Desenvolvimento Embrionário/genética , Regulação da Expressão Gênica no Desenvolvimento/genética , Mutação/genética , Neurônios/metabolismo , Sítio de Iniciação de Transcrição , Peixe-Zebra/genética , Peixe-Zebra/crescimento & desenvolvimento
2.
Development ; 146(14)2019 07 22.
Artigo em Inglês | MEDLINE | ID: mdl-31273051

RESUMO

Cells perceive their microenvironment through chemical and physical cues. However, how the mechanical signals are interpreted during embryonic tissue deformation to result in specific cell behaviors is largely unknown. The Yap/Taz family of transcriptional co-activators has emerged as an important regulator of tissue growth and regeneration, responding to physical cues from the extracellular matrix, and to cell shape and actomyosin cytoskeletal changes. In this study, we demonstrate the role of Yap/Taz-TEAD activity as a sensor of mechanical signals in the regulation of the progenitor behavior of boundary cells during zebrafish hindbrain compartmentalization. Monitoring of in vivo Yap/Taz activity during hindbrain segmentation indicated that boundary cells responded to mechanical cues in a cell-autonomous manner through Yap/Taz-TEAD activity. Cell-lineage analysis revealed that Yap/Taz-TEAD boundary cells decreased their proliferative activity when Yap/Taz-TEAD activity ceased, which preceded changes in their cell fate from proliferating progenitors to differentiated neurons. Functional experiments demonstrated the pivotal role of Yap/Taz-TEAD signaling in maintaining progenitor features in the hindbrain boundary cell population.


Assuntos
Divisão Celular/genética , Proteínas de Ligação a DNA/fisiologia , Peptídeos e Proteínas de Sinalização Intracelular/fisiologia , Proteínas Nucleares/fisiologia , Rombencéfalo/citologia , Rombencéfalo/embriologia , Células-Tronco/fisiologia , Transativadores/fisiologia , Fatores de Transcrição/fisiologia , Proteínas de Peixe-Zebra/fisiologia , Animais , Animais Geneticamente Modificados , Padronização Corporal/genética , Diferenciação Celular/genética , Movimento Celular/genética , Proteínas de Ligação a DNA/genética , Embrião não Mamífero , Peptídeos e Proteínas de Sinalização Intracelular/genética , Fenômenos Mecânicos , Mecanotransdução Celular/genética , Mecanotransdução Celular/fisiologia , Neurogênese/genética , Proteínas Nucleares/genética , Organogênese/genética , Rombencéfalo/metabolismo , Transdução de Sinais/genética , Células-Tronco/citologia , Fatores de Transcrição de Domínio TEA , Transativadores/genética , Fatores de Transcrição/genética , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional , Proteínas de Sinalização YAP , Peixe-Zebra/embriologia , Peixe-Zebra/genética , Proteínas de Peixe-Zebra/genética
3.
Development ; 145(22)2018 11 22.
Artigo em Inglês | MEDLINE | ID: mdl-30327325

RESUMO

Hippo signaling is a critical pathway that integrates extrinsic and intrinsic mechanical cues to regulate organ size. Despite its essential role in organogenesis, little is known about its role in cell fate specification and differentiation. Here, we unravel a novel and unexpected role of the Hippo pathway effector Taz (wwtr1) in controlling the size, shape and fate of a unique cell in the zebrafish ovary. We show that wwtr1 mutant females are infertile. In teleosts, fertilization occurs through the micropyle, a funnel-like opening in the chorion, formed by a unique enlarged follicle cell, the micropylar cell (MC). We describe here, for the first time, the mechanism that underlies the differentiation of the MC. Our genetic analyses show that Taz is essential for MC fate acquisition and subsequent micropyle formation in zebrafish. We identify Taz as the first bona fide MC marker and show that Taz is specifically and strongly enriched in the MC precursor. Altogether, we performed the first genetic and molecular characterization of the MC and propose that Taz is a key regulator of MC fate.This article has an associated 'The people behind the papers' interview.


Assuntos
Fertilização , Peptídeos e Proteínas de Sinalização Intracelular/metabolismo , Morfogênese , Proteínas Serina-Treonina Quinases/metabolismo , Transdução de Sinais , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra/crescimento & desenvolvimento , Peixe-Zebra/metabolismo , Junções Aderentes/efeitos dos fármacos , Junções Aderentes/metabolismo , Animais , Biomarcadores/metabolismo , Polaridade Celular/efeitos dos fármacos , Forma Celular/efeitos dos fármacos , Citocalasina D/farmacologia , Feminino , Fertilização/efeitos dos fármacos , Infertilidade Feminina/genética , Infertilidade Feminina/patologia , Microtúbulos/efeitos dos fármacos , Microtúbulos/metabolismo , Modelos Biológicos , Morfogênese/efeitos dos fármacos , Mutação/genética , Oócitos/efeitos dos fármacos , Oócitos/metabolismo , Oócitos/patologia , Óvulo/efeitos dos fármacos , Óvulo/metabolismo , Serina-Treonina Quinase 3 , Junções Íntimas/efeitos dos fármacos , Junções Íntimas/metabolismo , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional
4.
Dev Biol ; 434(2): 249-266, 2018 02 15.
Artigo em Inglês | MEDLINE | ID: mdl-29287832

RESUMO

Control of microtubule dynamics is crucial for cell migration. We analyzed regulation of microtubule network dynamics in the zebrafish yolk cell during epiboly, the earliest coordinated gastrulation movement. We labeled microtubules with EMTB-3GFP and EB3-mCherry to visualize and measure microtubule dynamics by TIRF microscopy live imaging. Yolk cell microtubules dynamics is temporally modulated during epiboly progression. We used maternal zygotic Pou5f3 mutant (MZspg) embryos, which develop strong distortions of microtubule network organization and epiboly retardation, to investigate genetic control of microtubule dynamics. In MZspg embryos, microtubule plus-end growth tracks move slower and are less straight compared to wild-type. MZspg embryos have altered steroidogenic enzyme expression, resulting in increased pregnenolone and reduced progesterone levels. We show that progesterone positively affects microtubule plus-end growth and track straightness. Progesterone may thus act as a non-cell-autonomous regulator of microtubule dynamics across the large yolk cell, and may adjust differing demands on microtubule dynamics and stability during initiation and progression phases of epiboly.


Assuntos
Gástrula/embriologia , Gastrulação/efeitos dos fármacos , Microtúbulos/metabolismo , Progesterona/farmacologia , Peixe-Zebra/embriologia , Animais , Gastrulação/fisiologia , Microtúbulos/genética , Peixe-Zebra/genética
5.
BMC Biotechnol ; 19(1): 68, 2019 10 22.
Artigo em Inglês | MEDLINE | ID: mdl-31640669

RESUMO

BACKGROUND: Developmental biology relies to a large extent on the observation and comparison of phenotypic traits through time using high resolution microscopes. In this context, transparent model organisms such as the zebrafish Danio rerio in which developing tissues and organs can be easily observed and imaged using fluorescent proteins have become very popular. One limiting factor however is the acquisition of a sufficient amount of data, in standardized and reproducible conditions, to allow robust quantitative analysis. One way to improve this is by developing mounting methods to increase the number of embryos that can be imaged simultaneously in near-to-identical orientation. RESULTS: Here we present an improved mounting method allowing semi-automated and high-content imaging of zebrafish embryos. It is based on a 3D-printed stamp which is used to create a 2D coordinate system of multiple µ-wells in an agarose cast. Each µ-well models a negative of the average zebrafish embryo morphology between 22 and 96 h-post-fertilization. Due to this standardized and reproducible arrangement, it is possible to define a custom well plate in the respective imaging software that allows for a semi-automated imaging process. Furthermore, the improvement in Z-orientation significantly reduces post-processing and improves comparability of volumetric data while reducing light exposure and thus photo-bleaching and photo-toxicity, and improving signal-to-noise ratio (SNR). CONCLUSIONS: We present here a new method that allows to standardize and improve mounting and imaging of embryos. The 3D-printed stamp creates a 2D coordinate system of µ-wells in an agarose cast thus standardizing specimen mounting and allowing high-content imaging of up to 44 live or mounted zebrafish embryos simultaneously in a semi-automated, well-plate like manner on inverted confocal microscopes. In summary, image data quality and acquisition efficiency (amount of data per time) are significantly improved. The latter might also be crucial when using the services of a microscopy facility.


Assuntos
Embrião não Mamífero/diagnóstico por imagem , Microscopia Confocal/métodos , Impressão Tridimensional , Animais , Razão Sinal-Ruído , Peixe-Zebra
6.
Angew Chem Int Ed Engl ; 58(52): 18957-18963, 2019 12 19.
Artigo em Inglês | MEDLINE | ID: mdl-31693786

RESUMO

Natural products (NPs) from microorganisms have been important sources for discovering new therapeutic and chemical entities. While their corresponding biosynthetic gene clusters (BGCs) can be easily identified by gene-sequence-similarity-based bioinformatics strategies, the actual access to these NPs for structure elucidation and bioactivity testing remains difficult. Deletion of the gene encoding the RNA chaperone, Hfq, results in strains losing the production of most NPs. By exchanging the native promoter of a desired BGC against an inducible promoter in Δhfq mutants, almost exclusive production of the corresponding NP from the targeted BGC in Photorhabdus, Xenorhabdus and Pseudomonas was observed including the production of several new NPs derived from previously uncharacterized non-ribosomal peptide synthetases (NRPS). This easyPACId approach (easy Promoter Activated Compound Identification) facilitates NP identification due to low interference from other NPs. Moreover, it allows direct bioactivity testing of supernatants containing secreted NPs, without laborious purification.


Assuntos
Produtos Biológicos/química , Vias Biossintéticas/genética , Metabolômica/métodos , Humanos
7.
Development ; 141(6): 1282-91, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24595289

RESUMO

The directed migration of cell collectives drives the formation of complex organ systems. A characteristic feature of many migrating collectives is a 'tissue-scale' polarity, whereby 'leader' cells at the edge of the tissue guide trailing 'followers' that become assembled into polarised epithelial tissues en route. Here, we combine quantitative imaging and perturbation approaches to investigate epithelial cell state transitions during collective migration and organogenesis, using the zebrafish lateral line primordium as an in vivo model. A readout of three-dimensional cell polarity, based on centrosomal-nucleus axes, allows the transition from migrating leaders to assembled followers to be quantitatively resolved for the first time in vivo. Using live reporters and a novel fluorescent protein timer approach, we investigate changes in cell-cell adhesion underlying this transition by monitoring cadherin receptor localisation and stability. This reveals that while cadherin 2 is expressed across the entire tissue, functional apical junctions are first assembled in the transition zone and become progressively more stable across the leader-follower axis of the tissue. Perturbation experiments demonstrate that the formation of these apical adherens junctions requires dynamic microtubules. However, once stabilised, adherens junction maintenance is microtubule independent. Combined, these data identify a mechanism for regulating leader-to-follower transitions within migrating collectives, based on the relocation and stabilisation of cadherins, and reveal a key role for dynamic microtubules in this process.


Assuntos
Polaridade Celular/fisiologia , Peixe-Zebra/embriologia , Junções Aderentes/genética , Junções Aderentes/fisiologia , Animais , Animais Geneticamente Modificados , Padronização Corporal/genética , Padronização Corporal/fisiologia , Caderinas/genética , Caderinas/metabolismo , Movimento Celular/genética , Movimento Celular/fisiologia , Polaridade Celular/genética , Proteínas de Fluorescência Verde/genética , Proteínas de Fluorescência Verde/metabolismo , Sistema da Linha Lateral/citologia , Sistema da Linha Lateral/embriologia , Sistema da Linha Lateral/metabolismo , Microtúbulos/genética , Microtúbulos/fisiologia , Organogênese/genética , Organogênese/fisiologia , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Peixe-Zebra/genética , Peixe-Zebra/metabolismo , Proteínas de Peixe-Zebra/genética , Proteínas de Peixe-Zebra/metabolismo
8.
Development ; 139(24): 4571-81, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23136387

RESUMO

During development, morphogenetic processes require a precise coordination of cell differentiation, cell shape changes and, often, cell migration. Yet, how pattern information is used to orchestrate these different processes is still unclear. During lateral line (LL) morphogenesis, a group of cells simultaneously migrate and assemble radially organized cell clusters, termed rosettes, that prefigure LL sensory organs. This process is controlled by Fibroblast growth factor (FGF) signalling, which induces cell fate changes, cell migration and cell shape changes. However, the exact molecular mechanisms induced by FGF activation that mediate these changes on a cellular level are not known. Here, we focus on the mechanisms by which FGFs control apical constriction and rosette assembly. We show that apical constriction in the LL primordium requires the activity of non-muscle myosin. We demonstrate further that shroom3, a well-known regulator of non-muscle myosin activity, is expressed in the LL primordium and that its expression requires FGF signalling. Using gain- and loss-of-function experiments, we demonstrate that Shroom3 is the main organizer of cell shape changes during rosette assembly, probably by coordinating Rho kinase recruitment and non-muscle myosin activation. In order to quantify morphogenesis in the LL primordium in an unbiased manner, we developed a unique trainable 'rosette detector'. We thus propose a model in which Shroom3 drives rosette assembly in the LL downstream of FGF in a Rho kinase- and non-muscle myosin-dependent manner. In conclusion, we uncovered the first mechanistic link between patterning and morphogenesis during LL sensory organ formation.


Assuntos
Fatores de Crescimento de Fibroblastos/metabolismo , Sistema da Linha Lateral/embriologia , Mecanorreceptores/fisiologia , Proteínas dos Microfilamentos/fisiologia , Morfogênese/genética , Proteínas de Peixe-Zebra/fisiologia , Peixe-Zebra/embriologia , Animais , Animais Geneticamente Modificados , Diferenciação Celular/genética , Diferenciação Celular/fisiologia , Movimento Celular/genética , Movimento Celular/fisiologia , Polaridade Celular/genética , Embrião não Mamífero , Fatores de Crescimento de Fibroblastos/fisiologia , Sistema da Linha Lateral/metabolismo , Sistema da Linha Lateral/fisiologia , Mecanorreceptores/citologia , Mecanorreceptores/metabolismo , Proteínas dos Microfilamentos/genética , Proteínas dos Microfilamentos/metabolismo , Morfogênese/fisiologia , Miosinas/metabolismo , Transdução de Sinais/genética , Transdução de Sinais/fisiologia , Distribuição Tecidual/genética , Peixe-Zebra/genética , Proteínas de Peixe-Zebra/genética , Proteínas de Peixe-Zebra/metabolismo
9.
Curr Opin Cell Biol ; 18(1): 102-7, 2006 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-16352429

RESUMO

The directed migration of cells drives the formation of many complex organ systems. Although in this morphogenetic context cells display a strong preference for migrating in organized, cohesive groups, little is known about the mechanisms that coordinate their movements. Recent studies on several model systems have begun to dissect the organization of these migrating tissues in vivo and have shown that cell guidance is mediated by a combination of chemical and mechanical cues.


Assuntos
Comunicação Celular , Embrião não Mamífero/fisiologia , Morfogênese , Animais , Biomarcadores , Movimento Celular , Quimiotaxia , Mecanotransdução Celular
10.
Methods Mol Biol ; 2218: 169-183, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33606231

RESUMO

In some animal species, fertilization occurs through a funnel-like canal called the "micropyle." In teleost fishes, the micropyle is formed by a very specialized follicle cell, called the micropylar cell (MC). Very little is known about the mechanisms underlying the specification and differentiation of the MC, a unique cell among hundreds that compose the follicle cell layer. The Hippo pathway effector Taz is essential for this process and is the first reported MC marker. Here, we describe a method to identify and mark the micropylar cell following the immunostaining procedure on cryosections or combining it with the RNA in situ hybridization on whole-mount follicles.


Assuntos
Folículo Ovariano/fisiologia , Peixe-Zebra/fisiologia , Animais , Diferenciação Celular/fisiologia , Feminino , Fertilização/fisiologia , Masculino , Oócitos/metabolismo , Oócitos/fisiologia , Folículo Ovariano/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Serina-Treonina Quinase 3 , Transdução de Sinais/fisiologia , Peixe-Zebra/metabolismo , Proteínas de Peixe-Zebra/metabolismo
11.
Dev Biol ; 327(2): 566-77, 2009 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-19152797

RESUMO

Patterning of the vertebrate hindbrain involves a segmentation process leading to the formation of seven rhombomeres along the antero-posterior axis. While recent studies have shed light on the mechanisms underlying progressive subdivision of the posterior hindbrain into individual rhombomeres, the early events involved in anterior hindbrain patterning are still largely unknown. In this paper we demonstrate that two zebrafish Iroquois transcription factors, Irx7 and Irx1b, are required for the proper formation and specification of rhombomeres 1 to 4 and, in particular, for krox20 activation in r3. We also show that Irx7 functionally interacts with Meis factors to activate the expression of anterior hindbrain markers, such as hoxb1a, hoxa2 and krox20, ectopically in the anterior neural plate. Then, focusing on krox20 expression, we show that the effect of Irx7 and Meis1.1 is mediated by element C, a conserved cis-regulatory element involved in krox20 activation in the hindbrain. Together, our data point to an essential function of Iroquois transcription factors in krox20 activation and, more generally, in anterior hindbrain specification.


Assuntos
Padronização Corporal/fisiologia , Proteína 2 de Resposta de Crescimento Precoce/metabolismo , Proteínas de Homeodomínio/metabolismo , Rombencéfalo , Fatores de Transcrição/metabolismo , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra , Animais , Biomarcadores/metabolismo , Proteína 2 de Resposta de Crescimento Precoce/genética , Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Homeodomínio/genética , Hibridização In Situ , Proteína Meis1 , Placa Neural/anatomia & histologia , Placa Neural/fisiologia , Elementos Reguladores de Transcrição , Rombencéfalo/anatomia & histologia , Rombencéfalo/embriologia , Fatores de Transcrição/genética , Peixe-Zebra/anatomia & histologia , Peixe-Zebra/embriologia , Peixe-Zebra/metabolismo , Proteínas de Peixe-Zebra/genética
12.
Cell Rep ; 32(3): 107932, 2020 07 21.
Artigo em Inglês | MEDLINE | ID: mdl-32698004

RESUMO

Cilia and the intraflagellar transport (IFT) proteins involved in ciliogenesis are associated with congenital heart diseases (CHDs). However, the molecular links between cilia, IFT proteins, and cardiogenesis are yet to be established. Using a combination of biochemistry, genetics, and live-imaging methods, we show that IFT complex B proteins (Ift88, Ift54, and Ift20) modulate the Hippo pathway effector YAP1 in zebrafish and mouse. We demonstrate that this interaction is key to restrict the formation of the proepicardium and the myocardium. In cellulo experiments suggest that IFT88 and IFT20 interact with YAP1 in the cytoplasm and functionally modulate its activity, identifying a molecular link between cilia-related proteins and the Hippo pathway. Taken together, our results highlight a noncanonical role for IFT complex B proteins during cardiogenesis and shed light on a mechanism of action for ciliary proteins in YAP1 regulation.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas de Transporte/metabolismo , Proteínas de Ciclo Celular/metabolismo , Flagelos/metabolismo , Coração/embriologia , Organogênese , Proteínas Serina-Treonina Quinases/metabolismo , Transativadores/metabolismo , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra/embriologia , Animais , Transporte Biológico , Proteínas Morfogenéticas Ósseas/metabolismo , Cílios/metabolismo , Células HEK293 , Células HeLa , Humanos , Camundongos Endogâmicos C57BL , Pericárdio/metabolismo , Ligação Proteica , Transdução de Sinais , Proteínas de Sinalização YAP
13.
Curr Opin Genet Dev ; 57: 54-60, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-31430686

RESUMO

Collective cell migration plays essential roles in embryogenesis and also contributes to disease states. Recent years have seen immense progress in understanding mechanisms and overarching concepts of collective cell migration. Self-organization of moving groups emerges as an important common feature. This includes self-generating gradients, internal chemotaxis or mechanotaxis and contact-dependent polarization within migrating cell groups. Here, we will discuss these concepts and their applications to classical models of collective cell migration. Further, we discuss new models and paradigms of collective cell migration and elaborate on open questions and future challenges. Answering these questions will help to expand our appreciation of this exciting theme in developmental cell biology and contribute to the understanding of disease states.


Assuntos
Movimento Celular/genética , Polaridade Celular/genética , Desenvolvimento Embrionário/genética , Animais , Quimiotaxia/genética , Biologia do Desenvolvimento/tendências , Humanos
14.
Nat Commun ; 10(1): 4113, 2019 09 11.
Artigo em Inglês | MEDLINE | ID: mdl-31511517

RESUMO

Intra-organ communication guides morphogenetic processes that are essential for an organ to carry out complex physiological functions. In the heart, the growth of the myocardium is tightly coupled to that of the endocardium, a specialized endothelial tissue that lines its interior. Several molecular pathways have been implicated in the communication between these tissues including secreted factors, components of the extracellular matrix, or proteins involved in cell-cell communication. Yet, it is unknown how the growth of the endocardium is coordinated with that of the myocardium. Here, we show that an increased expansion of the myocardial atrial chamber volume generates higher junctional forces within endocardial cells. This leads to biomechanical signaling involving VE-cadherin, triggering nuclear localization of the Hippo pathway transcriptional regulator Yap1 and endocardial proliferation. Our work suggests that the growth of the endocardium results from myocardial chamber volume expansion and ends when the tension on the tissue is relaxed.


Assuntos
Endocárdio/crescimento & desenvolvimento , Miocárdio/metabolismo , Transdução de Sinais , Peixe-Zebra/embriologia , Animais , Antígenos CD/metabolismo , Fenômenos Biomecânicos , Caderinas/metabolismo , Núcleo Celular/metabolismo , Proliferação de Células , Tamanho Celular , Proteínas do Citoesqueleto/metabolismo , Endocárdio/citologia , Átrios do Coração/citologia , Átrios do Coração/metabolismo , Proteína Homeobox Nkx-2.5/metabolismo , Junções Intercelulares/metabolismo , Modelos Biológicos , Mutação/genética , Transativadores/metabolismo , Proteínas Wnt/metabolismo , Proteínas de Sinalização YAP , Proteínas de Peixe-Zebra/metabolismo
15.
Nat Commun ; 9(1): 3660, 2018 09 10.
Artigo em Inglês | MEDLINE | ID: mdl-30202007

RESUMO

Kidney injury is a common complication of severe disease. Here, we report that injuries of the zebrafish embryonal kidney are rapidly repaired by a migratory response in 2-, but not in 1-day-old embryos. Gene expression profiles between these two developmental stages identify cxcl12a and myca as candidates involved in the repair process. Zebrafish embryos with cxcl12a, cxcr4b, or myca deficiency display repair abnormalities, confirming their role in response to injury. In mice with a kidney-specific knockout, Cxcl12 and Myc gene deletions suppress mitochondrial metabolism and glycolysis, and delay the recovery after ischemia/reperfusion injury. Probing these observations in zebrafish reveal that inhibition of glycolysis slows fast migrating cells and delays the repair after injury, but does not affect the slow cell movements during kidney development. Our findings demonstrate that Cxcl12 and Myc facilitate glycolysis to promote fast migratory responses during development and repair, and potentially also during tumor invasion and metastasis.


Assuntos
Quimiocina CXCL12/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Nefropatias/metabolismo , Proteínas Proto-Oncogênicas/metabolismo , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra/genética , Animais , Animais Geneticamente Modificados , Movimento Celular , Metabolismo Energético , Deleção de Genes , Perfilação da Expressão Gênica , Glicólise , Homeostase , Rim/lesões , Rim/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Transdução de Sinais , Tretinoína/química
16.
Dev Cell ; 40(6): 523-536.e6, 2017 03 27.
Artigo em Inglês | MEDLINE | ID: mdl-28350986

RESUMO

Endothelial cells (ECs) line the inside of blood vessels and respond to mechanical cues generated by blood flow. Mechanical stimuli regulate the localization of YAP by reorganizing the actin cytoskeleton. Here we demonstrate blood-flow-mediated regulation of endothelial YAP in vivo. We indirectly monitored transcriptional activity of Yap1 (zebrafish YAP) and its spatiotemporal localization in living zebrafish and found that Yap1 entered the nucleus and promoted transcription in response to blood flow. In cultured human ECs, laminar shear stress induced nuclear import of YAP and its transcriptional activity in a manner independent of Hippo signaling. We uncovered a molecular mechanism by which flow induced the nuclear translocation of YAP through the regulation of filamentous actin and angiomotin. Yap1 mutant zebrafish showed a defect in vascular stability, indicating an essential role for Yap1 in blood vessels. Our data imply that endothelial Yap1 functions in response to flow to maintain blood vessels.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Vasos Sanguíneos/metabolismo , Células Endoteliais/metabolismo , Hemorreologia , Fosfoproteínas/metabolismo , Transativadores/metabolismo , Proteínas de Peixe-Zebra/metabolismo , Actinas/metabolismo , Animais , Núcleo Celular/metabolismo , Células Endoteliais da Veia Umbilical Humana/metabolismo , Humanos , Peptídeos e Proteínas de Sinalização Intercelular , Proteínas de Membrana , Perfusão , Proteínas Serina-Treonina Quinases/metabolismo , Transporte Proteico , Serina-Treonina Quinase 3 , Resistência ao Cisalhamento , Transdução de Sinais/genética , Estresse Mecânico , Fatores de Transcrição , Transcrição Gênica , Ativação Transcricional/genética , Proteínas de Sinalização YAP , Peixe-Zebra/embriologia , Peixe-Zebra/genética
17.
J Comp Neurol ; 492(3): 289-302, 2005 Nov 21.
Artigo em Inglês | MEDLINE | ID: mdl-16217788

RESUMO

Iroquois genes are involved in many patterning processes during development. In particular, they act as prepattern genes to control proneural gene expression both in Drosophila and in vertebrates. In this paper, we have analyzed the expression during embryogenesis of the 11 zebrafish Iroquois genes, with special interest for nervous system formation and patterning. During the first 2 days of development, Iroquois genes are expressed in distinct domains in the neuroepithelium, as well as in groups of neuronal progenitors and neurons. They are also expressed at different stages of placodal development. These expression patterns are similar to the patterns of the murine irx genes and also show features specific to teleosts. For the zebrafish Iroquois gene family, we find both specific patterns and patterns conserved within a cluster, between paralogues, or in most genes of the family. Overall, these expression data suggest functions for the Iroquois family of transcription factors in neural and placodal patterning, neurogenesis, and neuronal specification.


Assuntos
Padronização Corporal , Sistema Nervoso Central , Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Homeodomínio/genética , Morfogênese , Proteínas de Peixe-Zebra/genética , Peixe-Zebra , Animais , Sistema Nervoso Central/anatomia & histologia , Sistema Nervoso Central/embriologia , Clonagem Molecular , Estruturas Embrionárias/anatomia & histologia , Estruturas Embrionárias/metabolismo , Proteínas de Homeodomínio/metabolismo , Hibridização In Situ , Família Multigênica , Neurônios/citologia , Neurônios/metabolismo , Isoformas de Proteínas/genética , Isoformas de Proteínas/metabolismo , Células-Tronco/citologia , Células-Tronco/metabolismo , Peixe-Zebra/embriologia , Peixe-Zebra/genética , Proteínas de Peixe-Zebra/metabolismo
18.
Elife ; 4: e08201, 2015 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-26335201

RESUMO

During development, proliferation must be tightly controlled for organs to reach their appropriate size. While the Hippo signaling pathway plays a major role in organ growth control, how it senses and responds to increased cell density is still unclear. In this study, we use the zebrafish lateral line primordium (LLP), a group of migrating epithelial cells that form sensory organs, to understand how tissue growth is controlled during organ formation. Loss of the cell junction-associated Motin protein Amotl2a leads to overproliferation and bigger LLP, affecting the final pattern of sensory organs. Amotl2a function in the LLP is mediated together by the Hippo pathway effector Yap1 and the Wnt/ß-catenin effector Lef1. Our results implicate for the first time the Hippo pathway in size regulation in the LL system. We further provide evidence that the Hippo/Motin interaction is essential to limit tissue size during development.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Membrana/metabolismo , Transativadores/metabolismo , Fatores de Transcrição/metabolismo , Proteínas de Peixe-Zebra/metabolismo , Peixe-Zebra/crescimento & desenvolvimento , Angiomotinas , Animais , Proliferação de Células , Células Epiteliais/fisiologia , Proteínas de Sinalização YAP , Peixe-Zebra/genética
19.
PLoS One ; 4(6): e5824, 2009 Jun 08.
Artigo em Inglês | MEDLINE | ID: mdl-19503807

RESUMO

The chemokine stromal cell-derived factor-1 (SDF1) was originally identified as a pre-B cell stimulatory factor but has been recently implicated in several other key steps in differentiation and morphogenesis. In addition, SDF1 as well as FGF signalling pathways have recently been shown to be involved in the control of epimorphic regeneration. In this report, we address the question of a possible interaction between the two signalling pathways during adult fin regeneration in zebrafish. Using a combination of pharmaceutical and genetic tools, we show that during epimorphic regeneration, expression of sdf1, as well as of its cognate receptors, cxcr4a, cxcr4b and cxcr7 are controlled by FGF signalling. We further show that, Sdf1a negatively regulates the expression of fgf20a. Together, these results lead us to propose that: 1) the function of Fgf in blastema formation is, at least in part, relayed by the chemokine Sdf1a, and that 2) Sdf1 exerts negative feedback on the Fgf pathway, which contributes to a transient expression of Fgf20a downstream genes at the beginning of regeneration. However this feedback control can be bypassed since the Sdf1 null mutants regenerate their fin, though slower. Very few mutants for the regeneration process were isolated so far, illustrating the difficulty in identifying genes that are indispensable for regeneration. This observation supports the idea that the regeneration process involves a delicate balance between multiple pathways.


Assuntos
Quimiocina CXCL12/metabolismo , Extremidades/fisiologia , Fatores de Crescimento de Fibroblastos/metabolismo , Regulação da Expressão Gênica , Regeneração , Animais , Diferenciação Celular , Quimiocinas/metabolismo , Extremidades/patologia , Modelos Biológicos , Mutação , Receptores CXCR/metabolismo , Transdução de Sinais , Peixe-Zebra , Proteínas de Peixe-Zebra/metabolismo
20.
Development ; 136(8): 1305-15, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19279138

RESUMO

Nuclear movements play an essential role in metazoan development. Although the intracellular transport mechanisms underlying nuclear movements have been studied in detail, relatively little is known about signals from surrounding cells and tissues controlling these movements. Here, we show that, in gastrulating zebrafish embryos, convergence movements of nuclei within the yolk syncytial layer (YSL) are guided by mesoderm and endoderm progenitors migrating along the surface of the yolk towards the dorsal side of the developing gastrula. Progenitor cells direct the convergence movements of internal yolk syncytial nuclei (iYSN) by modulating cortical flow within the YSL in which the iYSN are entrained. The effect of mesoderm and endoderm progenitors on the convergence movement of iYSN depends on the expression of E-cadherin, indicating that adhesive contact between the cells and the YSL is required for the mesendoderm-modulated YSL cortical flow mediating nuclear convergence. In summary, our data reveal a crucial function for cortical flow in the coordination of syncytial nuclear movements with surrounding cells and tissues during zebrafish gastrulation.


Assuntos
Núcleo Celular/metabolismo , Gema de Ovo/metabolismo , Células Gigantes/metabolismo , Peixe-Zebra/embriologia , Peixe-Zebra/metabolismo , Animais , Caderinas/genética , Caderinas/metabolismo , Movimento Celular , Embrião não Mamífero/citologia , Embrião não Mamífero/embriologia , Embrião não Mamífero/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Células Gigantes/citologia , Microscopia Eletrônica de Transmissão , Células-Tronco/citologia , Células-Tronco/metabolismo , Peixe-Zebra/genética
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA