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https://www.readbyqxmd.com/read/28718615/development-of-nanofiber-sponges-containing-nerve-guidance-conduit-for-peripheral-nerve-regeneration-in-vivo
#1
Binbin Sun, Zi-Fei Zhou, Tong Wu, Weiming Chen, Dawei Li, Hao Zheng, Hany El-Hamshary, Salem S Al-Deyab, Xiumei Mo, Yinxian Yu
In the study of hollow nerve guidance conduit (NGC), the dispersion of regenerated axons always confused the researchers. To address this problem, filler-containing NGC was prepared, which showed better effect in the application of nerve tissue engineering. In this study, nanofiber sponges with abundant macro-pores, high porosity, and superior compressive strength were fabricated by electrospinning and freeze-drying. Poly (l-lactic acid-co-ε-caprolactone)/silk fibroin (PLCL/SF) nanofiber sponges were used as filler to prepare three-dimensional nanofiber sponges-containing (NS-containing) NGC...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28716607/seven-pass-cadherins-celsr1-3
#2
REVIEW
Andre M Goffinet, Fadel Tissir
Cadherin EGF LAG seven-pass G-type receptors 1, 2 and 3 (CELSR1-3) form a family of three atypical cadherins with multiple functions in epithelia and in the nervous system. During the past decade, evidence has accumulated for a key role of CELSR1 in epithelial planar cell polarity (PCP), and for CELSR2 and CELSR3 in ciliogenesis and neural development, especially neuron migration and axon guidance in the central, peripheral and enteric nervous systems. Phenotypes in mutant mice indicate that CELSR proteins work in concert with FZD3 and FZD6, but several questions remain...
July 14, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28715647/the-role-of-netrin-1-in-angiogenesis-and-diabetic-retinopathy-a-promising-therapeutic-strategy
#3
Wenyi Wu, Hetian Lei, Junhui Shen, Luosheng Tang
Netrin-1 is an axon guidance cue and is necessary for neural and vascular development. It is involved in regulating axon guidance for attraction or repulsion, and it has a dual function in endothelial tip cell migration during angiogenesis. Netrin-1 has been shown to play an important role in angiogenesis, cancer progression, and inflammatory disease. Here we review the role of netrin-1 in retinal and angiogenesis development and the associated signaling pathways in diabetic retinopathy. The currently available data suggest that netrin-1 is a promising target for the development of anti-angiogenesis drugs...
May 2017: Discovery Medicine
https://www.readbyqxmd.com/read/28710397/brain-specific-lamellipodin-knockout-results-in-hyperactivity-and-increased-anxiety-of-mice
#4
Cristian Bodo, Cathy Fernandes, Matthias Krause
Lamellipodin (Lpd) functions as an important signalling integrator downstream of growth factor and axon guidance receptors. Mechanistically, Lpd promotes actin polymerization by interacting with F-actin and the actin effectors Ena/VASP proteins and the SCAR/WAVE complex. Thereby, Lpd supports lamellipodia protrusion, cell migration and endocytosis. In the mammalian central nervous system, Lpd contributes to neuronal morphogenesis, neuronal migration during development and its C. elegans orthologue MIG-10 also supports synaptogenesis...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710382/netrin-1-promotes-glioma-growth-by-activating-nf-%C3%AE%C2%BAb-via-unc5a
#5
Jing-Ying Chen, Xiao-Xiao He, Chi Ma, Xin-Min Wu, Xi-Lin Wan, Zhen-Kai Xing, Qing-Qing Pei, Xian-Ping Dong, Dong-Xu Liu, Wen-Cheng Xiong, Xiao-Juan Zhu
Gliomas, a common type of brain tumor, are characterized by aggressive infiltration, making it difficultly to cure by surgery. Netrin-1, an extracellular guidance cue critical for neuronal axon path-finding, has been reported to play an important role in cell invasion and migration in several types of cancers. However, the role of netrin-1 in glioma remains largely unknown. Here, we provide evidence suggested that Netrin-1 has a critical role in glioma growth. We found that netrin-1 was significantly increased in glioma samples and positively correlated with cell proliferation, tumor grade and malignancy...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28703336/a-genome-wide-association-study-reveals-candidate-genes-for-the-supernumerary-nipple-phenotype-in-sheep-ovis-aries
#6
W-F Peng, S-S Xu, X Ren, F-H Lv, X-L Xie, Y-X Zhao, M Zhang, Z-Q Shen, Y-L Ren, L Gao, M Shen, J Kantanen, M-H Li
Genome-wide association studies (GWASs) have been widely applied in livestock to identify genes associated with traits of economic interest. Here, we conducted the first GWAS of the supernumerary nipple phenotype in Wadi sheep, a native Chinese sheep breed, based on Ovine Infinium HD SNP BeadChip genotypes in a total of 144 ewes (75 cases with four teats, including two normal and two supernumerary teats, and 69 control cases with two teats). We detected 63 significant SNPs at the chromosome-wise threshold. Additionally, one candidate region (chr1: 170...
July 12, 2017: Animal Genetics
https://www.readbyqxmd.com/read/28701910/the-impact-of-ecological-niche-on-adaptive-flexibility-of-sensory-circuitry
#7
REVIEW
Sarah L Pallas
Evolution and development are interdependent, particularly with regard to the construction of the nervous system and its position as the machine that produces behavior. On the one hand, the processes directing development and plasticity of the brain provide avenues through which natural selection can sculpt neural cell fate and connectivity, and on the other hand, they are themselves subject to selection pressure. For example, mutations that produce heritable perturbations in neuronal birth and death rates, transcription factor expression, or availability of axon guidance factors within sensory pathways can markedly affect the development of form and thus the function of stimulus decoding circuitry...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28700942/a-pml-slit-axis-controls-physiological-cell-migration-and-cancer-invasion-in-the-cns
#8
Valeria Amodeo, Deli A, Joanne Betts, Stefano Bartesaghi, Ying Zhang, Angela Richard-Londt, Matthew Ellis, Rozita Roshani, Mikaella Vouri, Sara Galavotti, Sarah Oberndorfer, Ana Paula Leite, Alan Mackay, Aikaterini Lampada, Eva Wessel Stratford, Ningning Li, David Dinsdale, David Grimwade, Chris Jones, Pierluigi Nicotera, David Michod, Sebastian Brandner, Paolo Salomoni
Cell migration through the brain parenchyma underpins neurogenesis and glioblastoma (GBM) development. Since GBM cells and neuroblasts use the same migratory routes, mechanisms underlying migration during neurogenesis and brain cancer pathogenesis may be similar. Here, we identify a common pathway controlling cell migration in normal and neoplastic cells in the CNS. The nuclear scaffold protein promyelocytic leukemia (PML), a regulator of forebrain development, promotes neural progenitor/stem cell (NPC) and neuroblast migration in the adult mouse brain...
July 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28694018/the-enu-3-protein-family-members-function-in-the-wnt-pathway-parallel-to-unc-6-netrin-to-promote-motor-neuron-axon-outgrowth-in-c-elegans
#9
Roxana Oriana Florica, Victoria Hipolito, Stephen Bautista, Homa Anvari, Chloe Rapp, Suzan El-Rass, Alimohammad Asgharian, Costin N Antonescu, Marie T Killeen
The axons of the DA and DB classes of motor neurons fail to reach the dorsal cord in the absence of the guidance cue UNC-6/Netrin or its receptor UNC-5 in C. elegans. However, the axonal processes usually exit their cell bodies in the ventral cord in the absence of both molecules. Strains lacking functional versions of UNC-6 or UNC-5 have a low level of DA and DB motor neuron axon outgrowth defects. We found that mutations in the genes for all six of the ENU-3 proteins function to enhance the outgrowth defects of the DA and DB axons in strains lacking either UNC-6 or UNC-5...
July 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28692932/axon-guidance-pathways-served-as-common-targets-for-human-speech-language-evolution-and-related-disorders
#10
Huimeng Lei, Zhangming Yan, Xiaohong Sun, Yue Zhang, Jianhong Wang, Caihong Ma, Qunyuan Xu, Rui Wang, Erich D Jarvis, Zhirong Sun
Human and several nonhuman species share the rare ability of modifying acoustic and/or syntactic features of sounds produced, i.e. vocal learning, which is the important neurobiological and behavioral substrate of human speech/language. This convergent trait was suggested to be associated with significant genomic convergence and best manifested at the ROBO-SLIT axon guidance pathway. Here we verified the significance of such genomic convergence and assessed its functional relevance to human speech/language using human genetic variation data...
July 7, 2017: Brain and Language
https://www.readbyqxmd.com/read/28691197/loss-of-dcc-in-the-spinal-cord-is-sufficient-to-cause-a-deficit-in-lateralized-motor-control-and-the-switch-to-a-hopping-gait
#11
Jimmy Peng, Julien Ferent, Qingyu Li, Mingwei Liu, Ronan Vinicius da Silva, Hanns Ulrich Zeilhofer, Artur Kania, Ying Zhang, Frédéric Charron
BACKGROUND: Humans with heterozygous mutations in the axon guidance receptor DCC display congenital mirror movements (MMs), which are involuntary movements of body parts, such as fingers, on one side of the body that mirror voluntary movement of the opposite side. In mice, the homozygous Dcc(kanga) mutant allele causes synchronous MM-like hindlimb movements during locomotion, resulting in hopping. In both human and mice, the neuroanatomical defect responsible for the deficit in lateralized motor control remains to be elucidated...
July 10, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28689759/amplification-of-f-actin-disassembly-and-cellular-repulsion-by-growth-factor-signaling
#12
Jimok Yoon, Sang Bum Kim, Giasuddin Ahmed, Jerry W Shay, Jonathan R Terman
Extracellular cues that regulate cellular shape, motility, and navigation are generally classified as growth promoting (i.e., growth factors/chemoattractants and attractive guidance cues) or growth preventing (i.e., repellents and inhibitors). Yet, these designations are often based on complex assays and undefined signaling pathways and thus may misrepresent direct roles of specific cues. Here, we find that a recognized growth-promoting signaling pathway amplifies the F-actin disassembly and repulsive effects of a growth-preventing pathway...
July 3, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28689049/the-spatiotemporal-relationships-between-chondroitin-sulfate-proteoglycans-and-terminations-of-calcitonin-gene-related-peptide-and-parvalbumin-immunoreactive-afferents-in-the-spinal-cord-of-mouse-embryos
#13
Liqing Wang, Chao Yu, Jun Wang, Hui Zhao, Sun-On Chan
Chondroitin sulfate (CS) proteoglycans (PGs) are a family of complex molecules in the extracellular matrix and cell surface that regulate axon growth and guidance during development of the central nervous system. In this study, the expression of CSPGs was investigated in the mouse spinal cord at late embryonic and neonatal stages using CS-56 antibody. CS immunoreactivity was observed abundantly in ventral regions of spinal cord of embryonic day (E) 15 embryos. At E16 to E18, CS expression spread dorsally, but never reached the superficial layers of the dorsal horn...
July 5, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28679208/spatially-selective-dissection-of-signal-transduction-in-neurons-grown-on-netrin-1-printed-nanoarrays-via-segmented-fluorescence-fluctuation-analysis
#14
Angelica A Gopal, Sebastien G Ricoult, Stephanie N Harris, David Juncker, Timothy E Kennedy, Paul W Wiseman
Axonal growth cones extend during neural development in response to precise distributions of extracellular cues. Deleted in Colorectal Cancer (DCC), a receptor for the chemotropic guidance cue netrin-1, directs F-actin reorganization and is essential for mammalian neural development. To elucidate how the extracellular distribution of netrin-1 influences the distribution of DCC and F-actin within axonal growth cones, we patterned nanoarrays of substrate bound netrin-1 using lift off nanocontact printing. The distribution of DCC and F-actin in embryonic rat cortical neuron growth cones was then imaged using total internal reflection fluorescence (TIRF) microscopy...
July 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28677863/netrin-1-and-multiple-sclerosis-a-new-biomarker-for-neuroinflammation
#15
P Mulero, C Córdova, M Hernández, R Martín, B Gutiérrez, J C Muñoz, N Redondo, I Gallardo, N Téllez, M L Nieto
BACKGROUND AND PURPOSE: Netrin-1, an axon guidance protein, reduces serum levels of pro-inflammatory mediators and stabilizes the blood-brain barrier limiting the entrance of immune cells into the central nervous system. The aim was to investigate its presence in the experimental autoimmune encephalomyelitis (EAE) model and in multiple sclerosis (MS) patients with and without clinical activity. METHODS: Netrin-1 levels were evaluated in EAE mouse tissues. Afterwards, serum netrin-1 was cross-sectionally quantified in 90 patients with different MS phenotypes and 30 control subjects...
July 5, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28671693/transcriptomic-analysis-of-purified-human-cortical-microglia-reveals-age-associated-changes
#16
Thais F Galatro, Inge R Holtman, Antonio M Lerario, Ilia D Vainchtein, Nieske Brouwer, Paula R Sola, Mariana M Veras, Tulio F Pereira, Renata E P Leite, Thomas Möller, Paul D Wes, Mari C Sogayar, Jon D Laman, Wilfred den Dunnen, Carlos A Pasqualucci, Sueli M Oba-Shinjo, Erik W G M Boddeke, Suely K N Marie, Bart J L Eggen
Microglia are essential for CNS homeostasis and innate neuroimmune function, and play important roles in neurodegeneration and brain aging. Here we present gene expression profiles of purified microglia isolated at autopsy from the parietal cortex of 39 human subjects with intact cognition. Overall, genes expressed by human microglia were similar to those in mouse, including established microglial genes CX3CR1, P2RY12 and ITGAM (CD11B). However, a number of immune genes, not identified as part of the mouse microglial signature, were abundantly expressed in human microglia, including TLR, Fcγ and SIGLEC receptors, as well as TAL1 and IFI16, regulators of proliferation and cell cycle...
July 3, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28666936/human-induced-pluripotent-stem-cell-hipsc-derived-neurons-respond-to-convulsant-drugs-when-co-cultured-with-hipsc-derived-astrocytes
#17
Misawa Niki Ishii, Koji Yamamoto, Masanobu Shoji, Asano Asami, Yuji Kawamata
Accurate risk assessment for drug-induced seizure is expected to be performed before entering clinical studies because of its severity and fatal damage to drug development. Induced pluripotent stem cell (iPSC) technology has allowed the use of human neurons and glial cells in toxicology studies. Recently, several studies showed the advantage of co-culture system of human iPSC (hiPSC)-derived neurons with rodent/human primary astrocytes regarding neuronal functions. However, the application of hiPSC-derived neurons for seizure risk assessment has not yet been fully addressed, and not at all when co-cultured with hiPSC-derived astrocytes...
June 27, 2017: Toxicology
https://www.readbyqxmd.com/read/28663736/a-mechanistic-end-to-end-concussion-model-that-translates-head-kinematics-to-neurologic-injury
#18
Laurel J Ng, Vladislav Volman, Melissa M Gibbons, Pi Phohomsiri, Jianxia Cui, Darrell J Swenson, James H Stuhmiller
Past concussion studies have focused on understanding the injury processes occurring on discrete length scales (e.g., tissue-level stresses and strains, cell-level stresses and strains, or injury-induced cellular pathology). A comprehensive approach that connects all length scales and relates measurable macroscopic parameters to neurological outcomes is the first step toward rationally unraveling the complexity of this multi-scale system, for better guidance of future research. This paper describes the development of the first quantitative end-to-end (E2E) multi-scale model that links gross head motion to neurological injury by integrating fundamental elements of tissue and cellular mechanical response with axonal dysfunction...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28662516/integrated-high-throughput-analysis-identifies-gsk3-as-a-crucial-determinant-of-p53-mediated-apoptosis-in-lung-cancer-cells
#19
Yu Zhang, Chenyang Zhu, Bangyao Sun, Jiawei Lv, Zhonghua Liu, Shengwang Liu, Hai Li
BACKGROUND/AIMS: p53 dysfunction is frequently observed in lung cancer. Although restoring the tumour suppressor function of p53 is recently approved as a putative strategy for combating cancers, the lack of understanding of the molecular mechanism underlying p53-mediated lung cancer suppression has limited the application of p53-based therapies in lung cancer. METHODS AND RESULTS: Using RNA sequencing, we determined the transcriptional profile of human non-small cell lung carcinoma A549 cells after treatment with two p53-activating chemical compounds, nutlin and RITA, which could induce A549 cell cycle arrest and apoptosis, respectively...
June 30, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28660665/integrated-microrna-and-gene-expression-profiling-reveals-the-crucial-mirnas-in-curcumin-anti-lung-cancer-cell-invasion
#20
Jian-Wei Zhan, De-Min Jiao, Yi Wang, Jia Song, Jin-Hong Wu, Li-Jun Wu, Qing-Yong Chen, Sheng-Lin Ma
BACKGROUND: Curcumin (diferuloylmethane) has chemopreventive and therapeutic properties against many types of tumors, both in vitro and in vivo. Previous reports have shown that curcumin exhibits anti-invasive activities, but the mechanisms remain largely unclear. METHODS: In this study, both microRNA (miRNA) and messenger RNA (mRNA) expression profiles were used to characterize the anti-metastasis mechanisms of curcumin in human non-small cell lung cancer A549 cell line...
June 29, 2017: Thoracic Cancer
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