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Developmental Cell

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https://read.qxmd.com/read/31080060/high-molecular-weight-hyaluronan-is-a-hippo-pathway-ligand-directing-cell-density-dependent-growth-inhibition-via-par1b
#1
Takuya Ooki, Naoko Murata-Kamiya, Atsushi Takahashi-Kanemitsu, Weida Wu, Masanori Hatakeyama
High-molecular-weight hyaluronan, a major component of the extracellular matrix, is anti-oncogenic, whereas low-molecular-weight hyaluronan is pro-oncogenic, though the mechanisms underlying the size-dependent opposite bioactivities of hyaluronan remain uncertain. We show here that treatment with high-molecular-weight hyaluronan stimulates tumor-suppressive Hippo signaling in breast epithelial cells. Mechanistically, clustering of the CD44 extracellular domain by high-molecular-weight hyaluronan leads to recruitment of the polarity-regulating kinase PAR1b by the CD44 intracellular domain, which results in disruption of the Hippo signaling-inhibitory PAR1b-MST complex...
May 7, 2019: Developmental Cell
https://read.qxmd.com/read/31080059/two-step-maternal-to-zygotic-transition-with-two-phase-parental-genome-contributions
#2
Peng Zhao, Xuemei Zhou, Kun Shen, Zhenzhen Liu, Tianhe Cheng, Danni Liu, Yanbing Cheng, Xiongbo Peng, Meng-Xiang Sun
The maternal-to-zygotic transition (MZT) is an essential developmental turning point in both plants and animals. In plants, the timing of MZT and parental contributions to the zygotic transcriptome remain unclear. Here, by overcoming technical limitations, we characterize the Arabidopsis egg cell, zygote, and embryo transcriptomes across multiple stages. Using these datasets, we demonstrate that MZT occurs during zygote development and is a two-step interrelated process of rapid maternal transcript degradation followed by large-scale de novo transcription...
May 7, 2019: Developmental Cell
https://read.qxmd.com/read/31080058/opposing-gradients-of-microrna-expression-temporally-pattern-layer-formation-in-the-developing-neocortex
#3
Pengcheng Shu, Chao Wu, Xiangbin Ruan, Wei Liu, Lin Hou, Hongye Fu, Ming Wang, Chang Liu, Yi Zeng, Pan Chen, Bin Yin, Jiangang Yuan, Boqin Qiang, Xiaozhong Peng, Weimin Zhong
The precisely timed generation of different neuronal types is a hallmark of development from invertebrates to vertebrates. In the developing mammalian neocortex, neural stem cells change competence over time to sequentially produce six layers of functionally distinct neurons. Here, we report that microRNAs (miRNAs) are dispensable for stem-cell self-renewal and neuron production but essential for timing neocortical layer formation and specifying laminar fates. Specifically, as neurogenesis progresses, stem cells reduce miR-128 expression and miR-9 activity but steadily increase let-7 expression, whereas neurons initially maintain the differences in miRNA expression present at birth...
May 7, 2019: Developmental Cell
https://read.qxmd.com/read/31080057/nf-%C3%AE%C2%BAb-shapes-metabolic-adaptation-by-attenuating-foxo-mediated-lipolysis-in-drosophila
#4
Maral Molaei, Crissie Vandehoef, Jason Karpac
Metabolic and innate immune signaling pathways have co-evolved to elicit coordinated responses. However, dissecting the integration of these ancient signaling mechanisms remains a challenge. Using Drosophila, we uncovered a role for the innate immune transcription factor nuclear factor κB (NF-κB)/Relish in governing lipid metabolism during metabolic adaptation to fasting. We found that Relish is required to restrain fasting-induced lipolysis, and thus conserve cellular triglyceride levels during metabolic adaptation, through specific repression of ATGL/Brummer lipase gene expression in adipose (fat body)...
May 6, 2019: Developmental Cell
https://read.qxmd.com/read/31056345/a-gbf1-dependent-mechanism-for-environmentally-responsive-regulation-of-er-golgi-transport
#5
Mafalda Lopes-da-Silva, Jessica J McCormack, Jemima J Burden, Kimberly J Harrison-Lavoie, Francesco Ferraro, Daniel F Cutler
How can anterograde membrane trafficking be modulated by physiological cues? A screen of Golgi-associated proteins revealed that the ARF-GEF GBF1 can selectively modulate the ER-Golgi trafficking of prohaemostatic von Willebrand factor (VWF) and extracellular matrix (ECM) proteins in human endothelial cells and in mouse fibroblasts. The relationship between levels of GBF1 and the trafficking of VWF into forming secretory granules confirmed GBF1 is a limiting factor in this process. Further, GBF1 activation by AMPK couples its control of anterograde trafficking to physiological cues; levels of glucose control GBF1 activation in turn modulating VWF trafficking into secretory granules...
April 23, 2019: Developmental Cell
https://read.qxmd.com/read/31031197/interplay-between-the-kinesin-and-tubulin-mechanochemical-cycles-underlies-microtubule-tip-tracking-by-the-non-motile-ciliary-kinesin-kif7
#6
Shuo Jiang, Nandini Mani, Elizabeth M Wilson-Kubalek, Pei-I Ku, Ronald A Milligan, Radhika Subramanian
The correct localization of Hedgehog effectors to the tip of primary cilia is critical for proper signal transduction. The conserved non-motile kinesin Kif7 defines a "cilium-tip compartment" by localizing to the distal ends of axonemal microtubules. How Kif7 recognizes microtubule ends remains unknown. We find that Kif7 preferentially binds GTP-tubulin at microtubule ends over GDP-tubulin in the mature microtubule lattice, and ATP hydrolysis by Kif7 enhances this discrimination. Cryo-electron microscopy (cryo-EM) structures suggest that a rotated microtubule footprint and conformational changes in the ATP-binding pocket underlie Kif7's atypical microtubule-binding properties...
April 19, 2019: Developmental Cell
https://read.qxmd.com/read/31031198/reductional-meiosis-i-chromosome-segregation-is-established-by-coordination-of-key-meiotic-kinases
#7
Stefan Galander, Rachael E Barton, Weronika E Borek, Christos Spanos, David A Kelly, Daniel Robertson, Juri Rappsilber, Adèle L Marston
Meiosis produces gametes through a specialized, two-step cell division, which is highly error prone in humans. Reductional meiosis I, where maternal and paternal chromosomes (homologs) segregate, is followed by equational meiosis II, where sister chromatids separate. Uniquely during meiosis I, sister kinetochores are monooriented and pericentromeric cohesin is protected. Here, we demonstrate that these key adaptations for reductional chromosome segregation are achieved through separable control of multiple kinases by the meiosis-I-specific budding yeast Spo13 protein...
April 16, 2019: Developmental Cell
https://read.qxmd.com/read/31006647/inter-organ-growth-coordination-is-mediated-by-the-xrp1-dilp8-axis-in-drosophila
#8
Laura Boulan, Ditte Andersen, Julien Colombani, Emilie Boone, Pierre Léopold
How organs scale with other body parts is not mechanistically understood. We have addressed this question using the Drosophila imaginal disc model. When the growth of one disc domain is perturbed, other parts of the disc and other discs slow down their growth, maintaining proper inter-disc and intra-disc proportions. We show here that the relaxin-like Dilp8 is required for this inter-organ coordination. Our work also reveals that the stress-response transcription factor Xrp1 plays a key role upstream of dilp8 in linking organ growth status with the systemic growth response...
April 16, 2019: Developmental Cell
https://read.qxmd.com/read/31006648/an-ectoderm-derived-myeloid-like-cell-population-functions-as-antigen-transporters-for-langerhans-cells-in-zebrafish-epidermis
#9
Xi Lin, Qiuxia Zhou, Changlong Zhao, Guanzhen Lin, Jin Xu, Zilong Wen
Tissue-resident macrophages (TRMs) are highly heterogeneous and engage in a wide range of diverse functions. Yet, the heterogeneities of their origins and functions remain incompletely defined. Here, we report the identification and characterization of an ectoderm-derived myeloid-like cell, which we refer to as metaphocyte. We show that metaphocytes are highly similar to conventional Langerhans cells (cLCs), the resident macrophages in epidermis, in transcriptome, morphology, and anatomic location. However, unlike cLCs, metaphocytes respond neither to tissue injury nor to bacterial infection but rather sample soluble antigens from external environment through transepithelial protrusions and transfer them to cLCs via apoptosis-phagocytosis axis...
April 15, 2019: Developmental Cell
https://read.qxmd.com/read/31006650/an-sh3px1-dependent-endocytosis-autophagy-network-restrains-intestinal-stem-cell-proliferation-by-counteracting-egfr-erk-signaling
#10
Peng Zhang, Andreana N Holowatyj, Taylor Roy, Stephen M Pronovost, Marco Marchetti, Hanbin Liu, Cornelia M Ulrich, Bruce A Edgar
The effect of intracellular vesicle trafficking on stem-cell behavior is largely unexplored. We screened the Drosophila sorting nexins (SNXs) and discovered that one, SH3PX1, profoundly affects gut homeostasis and lifespan. SH3PX1 restrains intestinal stem cell (ISC) division through an endocytosis-autophagy network that includes Dynamin, Rab5, Rab7, Atg1, 5, 6, 7, 8a, 9, 12, 16, and Syx17. Blockages in this network stabilize ligand-activated EGFRs, recycling them via Rab11-dependent endosomes to the plasma membrane...
April 12, 2019: Developmental Cell
https://read.qxmd.com/read/31006649/spectraplakin-shot-maintains-perinuclear-microtubule-organization-in-drosophila-polyploid-cells
#11
Tianhui Sun, Yinlong Song, Jianli Dai, Decai Mao, Mengqi Ma, Jian-Quan Ni, Xin Liang, José C Pastor-Pareja
Polyploid cells endoreplicate their DNA through a modified cell cycle that skips mitosis as part of their differentiation programs. Upon cell-cycle exit and differentiation, non-centrosomal sites govern microtubule distribution in most cells. Little is known on how polyploid cells, differentiated but cycling, organize their microtubules. We show that microtubules in Drosophila adipocytes and other polyploid tissues form a dense perinuclear cortex responsible for nuclear size and position. Confirming a relation between this perinuclear cortex and the polyploid endocycle, polyploidization of normally diploid cells was sufficient for cortex formation...
April 12, 2019: Developmental Cell
https://read.qxmd.com/read/31006651/rap1b-promotes-notch-signal-mediated-hematopoietic-stem-cell-development-by-enhancing-integrin-mediated-cell-adhesion
#12
Seung-Sik Rho, Isao Kobayashi, Eri Oguri-Nakamura, Koji Ando, Masakazu Fujiwara, Naomi Kamimura, Hiromi Hirata, Atsuo Iida, Yoshiko Iwai, Naoki Mochizuki, Shigetomo Fukuhara
Hematopoietic stem cells (HSCs) emerge from hemogenic endothelium (HE) within the ventral portion of the dorsal aorta during vertebrate development. In zebrafish, Notch signaling induces HE specification from posterior lateral plate mesoderm (PLPM) cells as they migrate over the ventral surface of the somite. During migration, PLPM cells make close contact with Notch-ligand-expressing somitic cells to acquire HE identity. Herein, we show in zebrafish that the small GTPase Rap1b regulates HSC development by potentiating Notch-mediated HE specification...
April 9, 2019: Developmental Cell
https://read.qxmd.com/read/30982662/macropinocytosis-overcomes-directional-bias-in-dendritic-cells-due-to-hydraulic-resistance-and-facilitates-space-exploration
#13
Hélène D Moreau, Carles Blanch-Mercader, Rafaele Attia, Mathieu Maurin, Zahraa Alraies, Doriane Sanséau, Odile Malbec, Maria-Graciela Delgado, Philippe Bousso, Jean-François Joanny, Raphaël Voituriez, Matthieu Piel, Ana-Maria Lennon-Duménil
The migration of immune cells can be guided by physical cues imposed by the environment, such as geometry, rigidity, or hydraulic resistance (HR). Neutrophils preferentially follow paths of least HR in vitro, a phenomenon known as barotaxis. The mechanisms and physiological relevance of barotaxis remain unclear. We show that barotaxis results from the amplification of a small force imbalance by the actomyosin cytoskeleton, resulting in biased directional choices. In immature dendritic cells (DCs), actomyosin is recruited to the cell front to build macropinosomes...
April 9, 2019: Developmental Cell
https://read.qxmd.com/read/31006646/cerebrovascular-injuries-induce-lymphatic-invasion-into-brain-parenchyma-to-guide-vascular-regeneration-in-zebrafish
#14
Jingying Chen, Jianbo He, Rui Ni, Qifen Yang, Yaoguang Zhang, Lingfei Luo
Damage to regional cerebrovascular networks and neuronal tissues occurs during acute cerebrovascular diseases, such as ischemic stroke. The promotion of vascular regeneration is the most promising therapeutic approach. To understand the cellular and molecular mechanisms underlying brain vascular regeneration, we developed two zebrafish cerebrovascular injury models using genetic ablation and photochemical thrombosis. Although brain parenchyma is physiologically devoid of lymphatic vasculature, we found that cerebrovascular injuries induce rapid ingrowth of meningeal lymphatics into the injured parenchyma...
April 8, 2019: Developmental Cell
https://read.qxmd.com/read/30982664/oncogenic-notch-triggers-neoplastic-tumorigenesis-in-a-transition-zone-like-tissue-microenvironment
#15
Sheng-An Yang, Juan-Martin Portilla, Sonja Mihailovic, Yi-Chun Huang, Wu-Min Deng
During the initial stages of tumorigenesis, the tissue microenvironment where the pro-tumor cells reside plays a crucial role in determining the fate of these cells. Transition zones, where two types of epithelial cells meet, are high-risk sites for carcinogenesis, but the underlying mechanism remains largely unclear. Here, we show that persistent upregulation of Notch signaling induces neoplastic tumorigenesis in a transition zone between the salivary gland imaginal ring cells and the giant cells in Drosophila larvae...
April 4, 2019: Developmental Cell
https://read.qxmd.com/read/30982665/nipsnap1-and-nipsnap2-act-as-eat-me-signals-for-mitophagy
#16
Yakubu Princely Abudu, Serhiy Pankiv, Benan John Mathai, Alf Håkon Lystad, Christian Bindesbøll, Hanne Britt Brenne, Matthew Yoke Wui Ng, Bernd Thiede, Ai Yamamoto, Thaddaeus Mutugi Nthiga, Trond Lamark, Camila V Esguerra, Terje Johansen, Anne Simonsen
The clearance of damaged or dysfunctional mitochondria by selective autophagy (mitophagy) is important for cellular homeostasis and prevention of disease. Our understanding of the mitochondrial signals that trigger their recognition and targeting by mitophagy is limited. Here, we show that the mitochondrial matrix proteins 4-Nitrophenylphosphatase domain and non-neuronal SNAP25-like protein homolog 1 (NIPSNAP1) and NIPSNAP2 accumulate on the mitochondria surface upon mitochondrial depolarization. There, they recruit proteins involved in selective autophagy, including autophagy receptors and ATG8 proteins, thereby functioning as an "eat me" signal for mitophagy...
April 3, 2019: Developmental Cell
https://read.qxmd.com/read/30982661/mir205hg-is-a-long-noncoding-rna-that-regulates-growth-hormone-and-prolactin-production-in-the-anterior-pituitary
#17
Qiumei Du, Ashley R Hoover, Igor Dozmorov, Prithvi Raj, Shaheen Khan, Erika Molina, Tsung-Cheng Chang, Maria Teresa de la Morena, Ondine B Cleaver, Joshua T Mendell, Nicolai S C van Oers
MicroRNAs (miRNAs) are processed from primary miRNA transcripts (pri-miRNAs), many of which are annotated as long noncoding RNAs (lncRNAs). We assessed whether MIR205HG, the host gene for miR-205, has independent functions as an lncRNA. Comparing mice with targeted deletions of MIR205HG and miR-205 revealed a functional role for the lncRNA in the anterior pituitary. Mice lacking MIR205HG had a temporal reduction in Pit1, growth hormone, and prolactin. This was mediated, in part, through the ability of this lncRNA to bind and regulate the transcriptional activity of Pit1 in conjunction with Zbtb20...
April 3, 2019: Developmental Cell
https://read.qxmd.com/read/30956008/the-long-non-coding-rna-lep-5-promotes-the-juvenile-to-adult-transition-by-destabilizing-lin-28
#18
Karin C Kiontke, R Antonio Herrera, Edward Vuong, Jintao Luo, Erich M Schwarz, David H A Fitch, Douglas S Portman
Biological roles for most long non-coding RNAs (lncRNAs) remain mysterious. Here, using forward genetics, we identify lep-5, a lncRNA acting in the C. elegans heterochronic (developmental timing) pathway. Loss of lep-5 delays hypodermal maturation and male tail tip morphogenesis (TTM), hallmarks of the juvenile-to-adult transition. We find that lep-5 is a ∼600 nt cytoplasmic RNA that is conserved across Caenorhabditis and possesses three essential secondary structure motifs but no essential open reading frames...
April 2, 2019: Developmental Cell
https://read.qxmd.com/read/30982660/loss-of-sirtuin-1-alters-the-secretome-of-breast-cancer-cells-by-impairing-lysosomal-integrity
#19
Arash Latifkar, Lu Ling, Amrit Hingorani, Eric Johansen, Amdiel Clement, Xiaoyu Zhang, John Hartman, Claudia Fischbach, Hening Lin, Richard A Cerione, Marc A Antonyak
The NAD+ -dependent deacetylase Sirtuin 1 (SIRT1) is down-regulated in triple-negative breast cancer. To determine the mechanistic basis by which reduced SIRT1 expression influences processes related to certain aggressive cancers, we examined the consequences of depleting breast cancer cells of SIRT1. We discovered that reducing SIRT1 levels decreased the expression of one particular subunit of the vacuolar-type H+ ATPase (V-ATPase), which is responsible for proper lysosomal acidification and protein degradation...
April 1, 2019: Developmental Cell
https://read.qxmd.com/read/30956009/ceh-60-pbx-and-unc-62-meis-coordinate-a-metabolic-switch-that-supports-reproduction-in-c-elegans
#20
Robert H Dowen
The molecular basis of how animals integrate metabolic, developmental, and environmental information before committing resources to reproduction is an unresolved issue in developmental biology. In C. elegans, adult animals reallocate fat stores from intestinal cells to the germline via low-density lipoprotein (LDL)-like particles to promote embryogenesis. Here, I demonstrate that two conserved homeodomain transcription factors, CEH-60/PBX and UNC-62/MEIS, coordinate a transcriptional network that supports reproduction while suppressing longevity and stress-response pathways...
March 29, 2019: Developmental Cell
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