Abstract：
:Insulin-producing beta-cells are present as single cells or in small clusters distributed throughout the pancreas of the Xenopus laevis tadpole. During metamorphic climax when the exocrine pancreas dedifferentiates to progenitor cells, the beta-cells undergo two changes. Insulin mRNA is down regulated at the beginning of metamorphic climax (NF62) and reexpressed again near the end of climax. Secondly, the beta-cells aggregate to form islets. During climax the increase in insulin cluster size is not caused by cell proliferation or by acinar-to-beta-cell transdifferentiation, but rather is due to the aggregation of pre-existing beta-cells. The total number of beta-cells does not change during the 8 days of climax. Thyroid hormone (TH) induction of premetamorphic tadpoles causes an increase in islet size while prolonged treatment of tadpoles with the goitrogen methimazole inhibits this increase. Expression of a dominant negative form of the thyroid hormone receptor (TRDN) driven by the elastase promoter not only protects the exocrine pancreas of a transgenic tadpole from TH-induced dedifferentiation but also prevents aggregation of beta-cells at climax. These transgenic tadpoles do however undergo normal loss and resynthesis of insulin mRNA at the same stage as controls. In contrast transgenic tadpoles with the same TRDN transgene driven by an insulin promoter do not undergo down regulation of insulin mRNA, but do aggregate beta-cells to form islets like controls. These results demonstrate that TH controls the remodeling of beta-cells through cell-cell interaction with dedifferentiating acinar cells and a cell autonomous program that temporarily shuts off the insulin gene.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Mukhi S,Horb ME,Brown DDdoi
10.1016/j.ydbio.2009.01.038subject
Has Abstractpub_date
2009-04-15 00:00:00pages
384-91issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(09)00093-1journal_volume
328pub_type
杂志文章abstract：:The migration and fate of cranial and vagal neural crest-derived progenitor cells (NCPCs) have been extensively studied; however, much less is known about sacral NCPCs particularly in regard to their distribution in the urogenital system. To construct a spatiotemporal map of NCPC migration pathways into the developing...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2017.04.011
更新日期：2017-09-01 00:00:00
abstract：:Summary Sentence: Conditional ablation of AP-2 gamma results in a delay in skin development and abnormal expression of p63, K14, K1, filaggrin, repetin and secreted Ly6/Plaur domain containing 1, key genes required for epidermal development and differentiation. The development of the epidermis, a stratified squamous e...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2008.02.017
更新日期：2008-05-01 00:00:00
abstract：:Proper spatial expression of the wingless (wg) gene in the Drosophila embryonic epidermis is crucial to intrasegmental patterning. Single cell wide wg expression is initiated at the blastoderm stage in response to combinatorial regulation by the pair rule genes. Later, during gastrulation, when the epidermal expressio...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1995.1243
更新日期：1995-08-01 00:00:00
abstract：:N-cadherin is a Ca2+-dependent cell-cell adhesion molecule, which was identified in brain cells of mouse and chicken. In the present study, we have determined the pattern of expression of N-cadherin in chicken embryos at various stages by means of immunohistochemistry. N-cadherin was expressed in cells derived from al...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(87)90119-9
更新日期：1987-03-01 00:00:00
abstract：:We have cloned a Caenorhabditis elegans homologue of the Drosophila gap gene hunchback (hb) and have designated it hbl-1 (hunchback-like). hbl-1 encodes a predicted 982-amino-acid protein, containing two putative zinc-finger domains similar to those of Drosophila Hunchback. The gene is transcribed embryonically, but u...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1998.9096
更新日期：1999-01-15 00:00:00
abstract：:There is a natural curiosity about how organisms give rise to offspring like themselves through a series of reproducible developmental events and how, once mature, these offspring mate and continue the process giving rise the next generation. In the mid-1800s investigators started using gametes and embryos to explore ...
journal_title：Developmental biology
pub_type： 历史文章,杂志文章
doi：10.1016/j.ydbio.2011.06.021
更新日期：2011-10-15 00:00:00
abstract：:Msx1 and Msx2 are highly conserved, Nk-related homeodomain transcription factors that are essential for a variety of tissue-tissue interactions during vertebrate organogenesis. Here we show that combined deficiencies of Msx1 and Msx2 cause conotruncal anomalies associated with malalignment of the cardiac outflow tract...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2007.05.037
更新日期：2007-08-15 00:00:00
abstract：:The Drosophila brain is generated by a complex series of morphogenetic movements. To better understand brain development and to provide a guide for experimental manipulation of brain progenitors, we created a fate map using photoactivated gene expression to mark cells originating within specific mitotic domains and ti...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/s0012-1606(03)00220-3
更新日期：2003-08-01 00:00:00
abstract：:Following their birth in olfactory placode, luteinizing hormone-releasing hormone (LHRH)-containing neurons migrate across the developing cribriform plate and form a dispersed population in the mammalian basal forebrain. The present study reveals the colocalization of unique glycoconjugate antigens (detected with mono...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1993.1045
更新日期：1993-02-01 00:00:00
abstract：:Peptide growth factors can initiate changes in cell fate in Xenopus ectodermal explants and induce the formation of mesoderm. Marker genes expressed in mesoderm allow the analysis of whether, or how much, induction has occurred, but do not tell us what molecules are involved in carrying out the response. In this repor...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1996.0158
更新日期：1996-07-10 00:00:00
abstract：:The molting cycle in insects is regulated by the fluctuating levels of ecdysteroids. Twenty-four hours prior to the pupal molt in Manduca sexta steroid titers are relatively high and they fall to very low levels at 4 hr before the molt. Several physiological events accompanying molts have been shown to require the ris...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1994.1115
更新日期：1994-04-01 00:00:00
abstract：:Cyclic protein-2 (CP-2) is secreted in vitro in substantial amounts by mature rat Sertoli cells in intact Stage VI and Stage VII seminiferous tubules. This stage-dependent secretion has led us to postulate that the biosynthesis of this molecule is stimulated by germ cells at a specific state of development. In order t...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(88)90412-5
更新日期：1988-11-01 00:00:00
abstract：:Cellular interactions with laminin are important for numerous morphogenetic events. In Xenopus, the first of these is neurulation. The integrin alpha6 subunit mediates an attachment of the cells of the neural plate to the underlying basal lamina. A disruption of this interaction results in embryos that fail to neurula...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.2000.9833
更新日期：2000-09-01 00:00:00
abstract：:To examine the relationship between growth hormone (GH) and insulin-like growth factor 1 (IGF1) in controlling postnatal growth, we performed a comparative analysis of dwarfing phenotypes manifested in mouse mutants lacking GH receptor, IGF1, or both. This genetic study has provided conclusive evidence demonstrating t...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.2000.9975
更新日期：2001-01-01 00:00:00
abstract：:The origin and development of mouse kidney vasculature were examined in chorioallantoic grafts of early kidney rudiments and of experimentally induced explants of separated metanephric mesenchymes. Whole kidney rudiments developed into advanced stages, expressed the segment-specific antigenic markers of tubules and th...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(83)90180-x
更新日期：1983-04-01 00:00:00
abstract：:We present a genetic, developmental and molecular analysis of lethal(1)discs large-1[l(1)d.lg-1; Stewart et al., 1972], an oncogene of Drosophila. Mutations in this gene cause the imaginal discs to grow by cell proliferation beyond their normal final size, transform into solid tumors, fuse with one another and the bra...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(89)90092-4
更新日期：1989-07-01 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：:Choroideremia (CHM) is a hereditary eye disease caused by mutations in the X-linked CHM gene. Disruption of the Chm gene in mice resulted in prenatal death of Chm-/Y males and Chm-/Chm+ females that had inherited the mutation from their mothers. Male chimeras and Chm+/Chm- females with paternal transmission of the mut...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2004.04.016
更新日期：2004-08-01 00:00:00
abstract：:The mechanisms involved in the formation and the differentiation of the liver remain unclear despite extensive studies. To investigate these events in mouse hepatic development, we have taken advantage of the N-myc mutant mouse line which exhibits abnormal liver development. N-myc mutant embryos die between 11.5 and 1...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1997.8823
更新日期：1998-03-01 00:00:00
abstract：:The epidermis forms a vital barrier composed of stratified keratinocytes and their differentiated products. One of these products, keratin K10, is critical to epidermal integrity, because mutations in k10 lead to abnormal blistering. For the normal expression of k10, differentiation-associated transcription factors C/...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.1999.9460
更新日期：1999-12-01 00:00:00
abstract：:Hox genes are well-known master regulators in developmental morphogenesis along the anteroposterior axis of animals. However, the molecular mechanisms by which Hox proteins regulate their target genes and determine cell fates are not fully understood. The silk gland of Bombyx mori is a tubular tissue divided into seve...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2013.12.002
更新日期：2014-02-01 00:00:00
abstract：:The current gene regulatory network (GRN) for the sea urchin embryo pertains to pregastrular specification functions in the endomesodermal territories. Here we extend gene regulatory network analysis to the adjacent oral and aboral ectoderm territories over the same period. A large fraction of the regulatory genes pre...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2009.02.029
更新日期：2009-05-15 00:00:00
abstract：:Developmental boundaries ensure that cells fated to participate in a particular structure are brought together or maintained at the appropriate locale within developing embryos. Parasegment grooves mark the position of boundaries that separate every segment of the Drosophila embryo into anterior and posterior compartm...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2008.04.026
更新日期：2008-09-15 00:00:00
abstract：:Arthropods, vertebrates, and annelids all have a segmented body. Our recent discovery of involvement of Notch-signalling in spider segmentation revived the discussion on the origin of segmented body plans and suggests the sharing of a common genetic program in a common ancestor. Here, we analysed the spider homologues...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2005.01.024
更新日期：2005-04-01 00:00:00
abstract：:The regulation of Sertoli cell transferrin and sulfated glycoprotein-2 (SGP-2) mRNA levels by vitamin A was studied in vitamin A deficient rats. Vitamin A deficiency differentially affected the levels of these mRNAs. Sertoli cells from vitamin A deficient rats contained 3-fold less transferrin mRNA and 1.8-fold more S...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(87)90167-9
更新日期：1987-06-01 00:00:00
abstract：:We have investigated the regulation of DNA synthesis in the heterokaryons of HL60 human myelomonocytic leukemia cells and NIH3T3 mouse fibroblasts to examine if the differentiated leukemia cells contained a replication inhibiting activity. Cell fusions were performed either by exposing a suspension of mixed cells to a...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/0012-1606(91)90417-2
更新日期：1991-04-01 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：:Actin-related protein 5 (ARP5) is a conserved subunit of the INO80 chromatin-remodeling complex in yeast and mammals. We have characterized the expression and subcellular distribution of Arabidopsis thaliana ARP5 and explored its role in the epigenetic control of multicellular development and DNA repair. ARP5-specific...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2009.08.006
更新日期：2009-11-01 00:00:00
abstract：:The dysgenetic lens (dyl) mouse mutant has mutations in Foxe3, which inactivate DNA binding by the encoded forkhead transcription factor. Here we confirm, by targeted inactivation, that Foxe3 mutations are responsible for the dyl phenotype, which include loss of lens epithelium; a small, cataractic lens; and failure o...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1016/j.ydbio.2006.09.021
更新日期：2007-02-01 00:00:00
abstract：:The mature heart valves and septa are derived from the cardiac cushions which initially form as local outgrowths of mesenchymal cells within the outflow tract and atrioventricular regions. Endocardial cells respond to signals from the overlying myocardium and undergo an epithelial-to-mesenchymal transformation to inva...
journal_title：Developmental biology
pub_type： 杂志文章
doi：10.1006/dbio.2001.0284
更新日期：2001-07-15 00:00:00
