Abstract：
:Using optical imaging assays, we investigated the dynamics of acetylcholine receptors (AChRs) at laminin-associated clusters on cultured myotubes in the absence or presence of the nerve-derived clustering factor, agrin. Using fluorescence recovery after photobleaching (FRAP) on fluorescent bungarotoxin-labeled receptors, we found that approximately 9% of original fluorescence was recovered after 8 h as surface AChRs were recruited into clusters. By quantifying the loss of labeled receptors and the recovery of fluorescence after photobleaching, we estimated that the half-life of clustered receptors was approximately 4.5 h. Despite the rapid removal of receptors, the accumulation of new receptors at clusters was robust enough to maintain receptor density over time. We also found that the AChR half-life was not affected by agrin despite its role in inducing the aggregation of AChRs. Interestingly, when agrin was added to myotubes grown on laminin-coated substrates, most new receptors were not directed into preexisting laminin-induced clusters but instead formed numerous small aggregates on the entire muscle surface. Time-lapse imaging revealed that the agrin-induced clusters could be seen as early as 1 h, and agrin treatment resulted in the complete dissipation of laminin-associated clusters by 24 h. These results reveal that while laminin and agrin are involved in the clustering of receptors they are not critical to the regulation of receptor metabolic stability at these clusters, and further argue that agrin is able to rapidly and fully negate the laminin substrate clustering effect while inducing the rapid formation of new clusters.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Bruneau EG,Macpherson PC,Goldman D,Hume RI,Akaaboune Mdoi
10.1016/j.ydbio.2005.09.041subject
Has Abstractpub_date
2005-12-01 00:00:00pages
248-58issue
1eissn
0012-1606issn
1095-564Xpii
S0012-1606(05)00677-9journal_volume
288pub_type
杂志文章abstract：:Mature hamster eggs exhibit repetitive increases in the intracellular Ca2+ concentration ([Ca2+]i) at fertilization, caused by inositol 1,4,5-trisphosphate (InsP3)-induced Ca2+ release (IICR) from stores. Oscillating Ca2+ rises also occurred in inseminated immature oocytes at the germinal vesicle (GV) stage but the pe...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1993.1059
更新日期：1993-03-01 00:00:00
abstract：:One function of the Wingless signaling pathway is to determine the naked, cuticle cell fate choice in the trunk epidermis of Drosophila larvae. The zinc finger protein Teashirt binds to the transactivator domain of Armadillo to modulate Wingless signaling output in the embryonic trunk and contributes to the naked cell...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.2001.0498
更新日期：2002-01-01 00:00:00
abstract：:In the vertebrate head, crucial parts of the sense organs and sensory ganglia develop from special regions, the cranial placodes. Despite their cellular and functional diversity, they arise from a common field of multipotent progenitors and acquire distinct identity later under the influence of local signalling. Here ...
journal_title：Developmental biology
pub_type： 杂志文章,评审
doi：10.1016/j.ydbio.2012.06.028
更新日期：2012-10-01 00:00:00
abstract：:Ca2+-sensitive microelectrodes were used to study changes in cytoplasmic free calcium during progesterone-induced meiotic maturation in Xenopus laevis oocytes. In contrast to previous reports, no changes were detected during the maturation process, although a large activation pulse of Ca2+ was seen when in vitro matur...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(85)90475-0
更新日期：1985-06-01 00:00:00
abstract：:The zebrafish fin is an excellent system to study the mechanisms of dermal bone patterning. Fin rays are segmented structures that form successive bifurcations both during ontogenesis and regeneration. Previous studies showed that sonic hedgehog (shha) may regulate regenerative bone patterning based on its expression ...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2012.03.008
更新日期：2012-05-15 00:00:00
abstract：:Drosophila Polycomb Repressive Complex 2 (PRC2) is a lysine methyltransferase that trimethylates histone H3 lysine 27 (H3K27me3), a modification essential for Polycomb silencing. Mutations in its catalytic subunit, E(Z), that abolish its methyltransferase activity disrupt Polycomb silencing, causing derepression of Po...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2011.12.007
更新日期：2012-04-15 00:00:00
abstract：:The vertebrate eye anlage grows out of the brain and folds into bilayered optic cups. The eye is patterned along multiple axes, precisely controlled by genetic programs, to delineate neural retina, pigment epithelium, and optic stalk tissues. Pax genes encode developmental regulators of key morphogenetic events, with ...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2020.12.020
更新日期：2021-01-09 00:00:00
abstract：:Stimulation of epithelial cell cycling by the neuropeptide head activator was analyzed in Hydra magnipapillata and compared with the action of head activator on bud formation and tentacle formation during head regeneration. The results obtained indicate that head activator treatment stimulates epithelial cell division...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1996.8491
更新日期：1997-03-01 00:00:00
abstract：:Morphogenesis of the vertebrate head relies on proper dorsal-ventral (D-V) patterning of neural crest cells (NCC) within the pharyngeal arches. Endothelin-1 (Edn1)-induced signaling through the endothelin-A receptor (Ednra) is crucial for cranial NCC patterning within the mandibular portion of the first pharyngeal arc...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2012.08.003
更新日期：2012-11-01 00:00:00
abstract：:A key step in organogenesis of the Drosophila tracheal system is the integration of isolated tracheal metameres into a connected tubular network. The interaction of tracheal cells with surrounding mesodermal cells is crucial in this process. In particular, single mesodermal cells called bridge-cells are essential for ...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2006.04.462
更新日期：2006-08-01 00:00:00
abstract：:The fertilization potential in Phallusia mammillata consisted of an initial rapid depolarization. This initial sperm-triggered depolarization was followed by a phase of membrane depolarization which was of either long or short duration, depending on the eggs. When of long duration, the phase of membrane depolarization...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(92)90108-s
更新日期：1992-10-01 00:00:00
abstract：:The MLH1 protein is required for normal meiosis in mice and its absence leads to failure in maintenance of pairing between bivalent chromosomes, abnormal meiotic division, and ensuing sterility in both sexes. In this study, we investigated whether failure to develop foci of MLH1 protein on chromosomes in prophase woul...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.2002.0708
更新日期：2002-09-01 00:00:00
abstract：:In many non-mammalian vertebrates, adult dentitions result from cyclical rounds of tooth regeneration wherein simple unicuspid teeth are replaced by more complex forms. Therefore and by contrast to mammalian models, the numerical majority of vertebrate teeth develop shape during the process of replacement. Here, we ex...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2013.02.007
更新日期：2013-05-15 00:00:00
abstract：:Pancreatic development depends on the transcription factor Pax6, which controls islet cell differentiation and hormone production. To understand the regulation of Pax6 pancreatic expression, we have identified a minimal Pax6 pancreatic enhancer and show that it contains a composite binding site for Meis and Pbx homeop...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2006.06.030
更新日期：2006-12-15 00:00:00
abstract：:Gr16 (chromosome 2, 6.9 cM) is a dominant, grey egg mutation of the domestic silkmoth, Bombyx mori, which produces an opaque instead of a translucent chorion. To determine the underlying cause of this defect, we examined the effects of the mutation on chorion ultrastructure, protein accumulation, and biosynthesis patt...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1993.1112
更新日期：1993-05-01 00:00:00
abstract：:Neural stem cells are present in specific regions of the adult central nervous system (CNS). Recent evidence suggests that the ciliary epithelium (CE), a CNS derivative, in the adult mammalian eye, harbors a quiescent population of neural stem cells. Here, we report the identification of c-Kit signaling as one of the ...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2004.05.023
更新日期：2004-09-01 00:00:00
abstract：:The midbrain-hindbrain boundary (MHB) acts as a local organizer in the development of the CNS in vertebrates. Previously, we identified an MHB-specific bHLH-WRPW transcriptional repressor gene, Xenopus Hes-related 1 (XHR1), which is initially expressed in the presumptive MHB (pre-MHB) region at the early gastrula stag...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2005.04.020
更新日期：2005-07-01 00:00:00
abstract：:The mammary gland (MG) is a unique organ responsible for milk synthesis, secretion, and involution to prepare the gland for subsequent lactation. The mammary epithelial cells (MECs), which are the milk synthesizing units of the MG, proliferate, differentiate, undergo apoptosis and regenerate following a cyclic pathway...
journal_title：Developmental biology
pub_type： 杂志文章,评审
doi：10.1016/j.ydbio.2018.11.002
更新日期：2019-01-15 00:00:00
abstract：:In the full grown oocyte of Xenopus laevis, a sodium permeability can be induced by depolarization to positive potential with current injection. Voltage-clamp analysis has shown that depolarization causes a long-lasting modification of the membrane during which voltage-gated sodium channels become functional. In the p...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(83)90302-0
更新日期：1983-10-01 00:00:00
abstract：:In the course of embryogenesis multicellular structures and organs are assembled from constituent cells. One structural component common to many organs is the tube, which consists most simply of a luminal space surrounded by a single layer of epithelial cells. The notochord of ascidian Ciona forms a tube consisting of...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2009.03.015
更新日期：2009-06-15 00:00:00
abstract：:Amphibian embryos from the genus Xenopus are among the best species for understanding early vertebrate development and for studying basic cell biological processes. Xenopus, and in particular the diploid Xenopus tropicalis, is also ideal for functional genomics. Understanding the behavior of genes in this accessible m...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2004.04.023
更新日期：2004-07-15 00:00:00
abstract：:Activation and role of mitogen-activated protein (MAP) kinase (MAPK) during mitosis are still matters of controversy in early embryos. We report here that an ERK-like protein is present and highly phosphorylated in unfertilized sea urchin eggs. This MAPK becomes dephosphorylated after fertilization and a small pool of...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2005.03.008
更新日期：2005-06-01 00:00:00
abstract：:Despite differences in the formation of neural precursors, all arthropod species analyzed so far generate about 30 single precursors (insects/crustaceans) or precursor groups (chelicerates/myriapods) per hemi-segment. In Drosophila, each precursor has a distinct identity conferred by segment polarity and dorso-ventral...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2005.11.029
更新日期：2006-02-15 00:00:00
abstract：:Multiciliated cells (MCCs) differentiate hundreds of motile cilia that beat to drive fluid movement over various kinds of epithelia. In Xenopus, mice and human, the coiled-coil containing protein Mcidas (Mci) has been shown to be a key transcriptional regulator of MCC differentiation. We have examined Mci function in ...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2020.07.005
更新日期：2020-09-15 00:00:00
abstract：:Nuclear receptors (NRs) are a large class of ligand-regulated transcriptional modulators that have been shown to play roles in many developmental processes. The Caenorhabditis elegans genome is predicted to encode a large and divergent family of NR proteins. The functions of most of these genes are unknown. As a first...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1999.9470
更新日期：1999-11-15 00:00:00
abstract：:Cleft palate is one of the most common craniofacial congenital defects in humans. It is associated with multiple genetic and environmental risk factors, including mutations in the genes encoding signaling molecules in the sonic hedgehog (Shh) pathway, which are risk factors for cleft palate in both humans and mice. Ho...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2018.07.003
更新日期：2018-09-01 00:00:00
abstract：:A follicular cDNA library from Bombyx mori (576 clones) was screened to obtain a representative sample of chorion sequences differentially expressed during the early period of choriogenesis. Ten selected sequences were characterized by Northern analysis and by dot blots of stage-specific RNA. Five of these sequences (...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(85)90408-7
更新日期：1985-12-01 00:00:00
abstract：:Notch signaling has a fundamental role in stem cell maintenance and in cell fate choice in the intestine of different species. Canonically, Notch signaling represses the expression of transcription factors of the achaete-scute like (ASCL) or atonal related protein (ARP) families. Identifying the ARP/ASCL genes express...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2013.01.011
更新日期：2013-04-15 00:00:00
abstract：:Expression of cardiac troponin I (TnIcardiac) and slow skeletal troponin I (TnIslow) genes was analyzed at the mRNA and protein level in the developing rat heart. TnIslow mRNA was detectable by in situ hybridization in the embryonic cardiac tube as early as the 13-somite stage (Embryonic Day 10). In contrast, TnIcardi...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1993.1074
更新日期：1993-03-01 00:00:00
abstract：:Spinal cord regenerative ability is lost with development, but the mechanisms underlying this loss are still poorly understood. In chick embryos, effective regeneration does not occur after E13, when spinal cord injury induces extensive apoptotic response and tissue damage. As initial experiments showed that treatment...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2011.04.015
更新日期：2011-07-15 00:00:00
