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https://www.readbyqxmd.com/read/28719464/nuclear-crx-and-foxj1-expression-differentiates-non-germ-cell-pineal-region-tumors-and-supports-the-ependymal-differentiation-of-papillary-tumor-of-the-pineal-region
#1
Shannon Coy, Adrian M Dubuc, Sonika Dahiya, Keith L Ligon, Alexandre Vasiljevic, Sandro Santagata
Papillary tumor of the pineal region (PTPR) is a neuroepithelial neoplasm first described in 2003. Despite the anatomic association of PTPR with the pineal gland, the features of these tumors resemble those of the ependymal circumventricular subcommissural organ (SCO) of the posterior third ventricle. Given the presumed distinct derivation of PTPR and pineal parenchymal tumors, we hypothesized that expression of lineage-specific transcription factors could distinguish these tumors and provide additional insight into the differentiation of PTPR...
July 17, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28716942/maternal-photoperiod-programs-hypothalamic-thyroid-status-via-the-fetal-pituitary-gland
#2
Cristina Sáenz de Miera, Béatrice Bothorel, Catherine Jaeger, Valérie Simonneaux, David Hazlerigg
In wild mammals, offspring development must anticipate forthcoming metabolic demands and opportunities. Within species, different developmental strategies may be used, dependent on when in the year conception takes place. This phenotypic flexibility is initiated before birth and is linked to the pattern of day length (photoperiod) exposure experienced by the mother during pregnancy. This programming depends on transplacental communication via the pineal hormone melatonin. Here, we show that, in the Siberian hamster (Phodopus sungorus), the programming effect of melatonin is mediated by the pars tuberalis (PT) of the fetal pituitary gland, before the fetal circadian system and autonomous melatonin production is established...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28707354/additive-neurogenesis-supported-by-multiple-stem-cell-populations-mediates-adult-spinal-cord-development-a-spatio-temporal-statistical-mapping-analysis-in-a-teleost-model-of-indeterminate-growth
#3
Ruxandra F Sîrbulescu, Iulian Ilieş, Annette Meyer, Günther K H Zupanc
The knifefish Apteronotus leptorhynchus exhibits indeterminate growth throughout adulthood. This phenomenon extends to the spinal cord, presumably through the continuous addition of new neurons and glial cells. However, little is known about the developmental dynamics of cells added during adult growth. The present work characterizes the structural and functional development of the adult spinal cord in this model organism through a comprehensive quantitative analysis of the spatial and temporal dynamics of new cells at various developmental stages...
July 13, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/28700939/neogenin-recruitment-of-the-wave-regulatory-complex-to-ependymal-and-radial-progenitor-adherens-junctions-prevents-hydrocephalus
#4
Conor J O'Leary, Cathrin C Nourse, Natalie K Lee, Amanda White, Michael Langford, Kai Sempert, Stacey J Cole, Helen M Cooper
Denudation of the ependyma due to loss of cell adhesion mediated by cadherin-based adherens junctions is a common feature of perinatal hydrocephalus. Junctional stability depends on the interaction between cadherins and the actin cytoskeleton. However, the molecular mechanism responsible for recruiting the actin nucleation machinery to the ependymal junction is unknown. Here, we reveal that loss of the netrin/RGM receptor, Neogenin, leads to severe hydrocephalus. We show that Neogenin plays a critical role in actin nucleation in the ependyma by anchoring the WAVE regulatory complex (WRC) and Arp2/3 to the cadherin complex...
July 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28698301/prdm16-is-required-for-the-maintenance-of-neural-stem-cells-in-the-postnatal-forebrain-and-their-differentiation-into-ependymal-cells
#5
Issei S Shimada, Melih Acar, Rebecca J Burgess, Zhiyu Zhao, Sean J Morrison
We and others showed previously that PR domain-containing 16 (Prdm16) is a transcriptional regulator required for stem cell function in multiple fetal and neonatal tissues, including the nervous system. However, Prdm16 germline knockout mice died neonatally, preventing us from testing whether Prdm16 is also required for adult stem cell function. Here we demonstrate that Prdm16 is required for neural stem cell maintenance and neurogenesis in the adult lateral ventricle subventricular zone and dentate gyrus. We also discovered that Prdm16 is required for the formation of ciliated ependymal cells in the lateral ventricle...
July 11, 2017: Genes & Development
https://www.readbyqxmd.com/read/28675430/parvalbumin-expressing-ependymal-cells-in-rostral-lateral-ventricle-wall-adhesions-contribute-to-aging-related-ventricle-stenosis-in-mice
#6
Federica Filice, Marco R Celio, Alexandre Babalian, Walter Blum, Viktoria Szabolcsi
Aging-associated ependymal-cell pathologies can manifest as ventricular gliosis, ventricle enlargement or ventricle stenosis. Ventricle stenosis and fusion of the lateral ventricle (LV) walls is associated with a massive decline of the proliferative capacities of the stem cell niche in the affected subventricular zone (SVZ) in aging mice. We examined the brains of adult C57BL/6 mice and found that ependymal cells located in the adhesions of the medial and lateral walls of the rostral LVs upregulated parvalbumin (PV) and displayed reactive phenotype, similarly to injury-reactive ependymal cells...
July 4, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28666954/1700012b09rik-a-foxj1-effector-gene-active-in-ciliated-tissues-of-the-mouse-but-not-essential-for-motile-ciliogenesis
#7
Michael Stauber, Karsten Boldt, Christoph Wrede, Marina Weidemann, Manuela Kellner, Karin Schuster-Gossler, Mark Philipp Kühnel, Jan Hegermann, Marius Ueffing, Achim Gossler
In humans and mice, motile cilia occur on the surface of the embryonic ventral node, on respiratory and ependymal epithelia and in reproductive organs where they ensure normal left-right asymmetry of the organism, mucociliary clearance of airways, homeostasis of the cerebrospinal fluid and fertility. The genetic programme for the formation of motile cilia, thus critical for normal development and health, is switched on by the key transcription factor FOXJ1. In previous microarray screens for murine FOXJ1 effectors, we identified candidates for novel factors involved in motile ciliogenesis, including both genes that are well conserved throughout metazoa and beyond, like FOXJ1 itself, and genes without overt homologues outside higher vertebrates...
June 28, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28658046/induction-of-endogenous-neural-stem-cells-by-extracorporeal-shock-waves-after-spinal-cord-injury
#8
Dong-Chul Shin, Kee-Yong Ha, Young-Hoon Kim, Jang-Woon Kim, Yoo-Kyung Cho, Sang-Il Kim
STUDY DESIGN: Animal experimental study OBJECTIVES.: The purpose of this study is to investigate the effects of extracorporeal shock waves (ESWs) on endogenous neural stem cells (NSCs) proliferation after spinal cord injury (SCI). SUMMARY OF BACKGROUND DATA: Exogenous stem cell transplantation for SCI still has many limitations to be addressed such as ideal cell sources, timing of transplantation, and fate of the transplanted cells. Moreover, the efficacy is another issue due to a peculiar pathologic condition in the chronic phase of SCI...
June 27, 2017: Spine
https://www.readbyqxmd.com/read/28644065/ventricular-pseudodiverticula-from-intraparenchymal-cerebrospinal-fluid-dissection-secondary-to-high-grade-obstructive-hydrocephalus-in-children-magnetic-resonance-imaging-findings
#9
Sonia F Calloni, Bruno P Soares, Thierry Agm Huisman
We report on a series of three children who presented with a focal cerebrospinal fluid collection within the periventricular white matter of the temporal and occipital lobes in the setting of high-grade obstructive hydrocephalus. Magnetic resonance imaging showed a focal defect within the ventricular wall associated with leakage of cerebrospinal fluid into the adjacent white matter. The white matter tracts appeared primarily displaced. This entity should be referred to as ventricular pseudodiverticulum, not lined by ependymal cells, in contrast to a true ventricular diverticulum in which the cerebrospinal fluid is contained by a focal outpouching of the intact ventricular wall lined by a dilated and prolapsed layer of ependymal cells...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28625779/multiple-isoforms-of-nesprin1-are-integral-components-of-ciliary-rootlets
#10
Chloe Potter, Wanqiu Zhu, David Razafsky, Philip Ruzycki, Alexander V Kolesnikov, Teresa Doggett, Vladimir J Kefalov, Ewelina Betleja, Moe R Mahjoub, Didier Hodzic
SYNE1 (synaptic nuclear envelope 1) encodes multiple isoforms of Nesprin1 (nuclear envelope spectrin 1) that associate with the nuclear envelope (NE) through a C-terminal KASH (Klarsicht/Anc1/Syne homology) domain (Figure 1A) [1-4]. This domain interacts directly with the SUN (Sad1/Unc84) domain of Sun proteins [5-7], a family of transmembrane proteins of the inner nuclear membrane (INM) [8, 9], to form the so-called LINC complexes (linkers of the nucleoskeleton and cytoskeleton) that span the entire NE and mediate nuclear positioning [10-12]...
July 10, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28587745/an-ex-vivo-spinal-cord-injury-model-to-study-ependymal-cells-in-adult-mouse-tissue
#11
Teresa Fernandez-Zafra, Simone Codeluppi, Per Uhlén
Traumatic spinal cord injury is characterized by an initial cell loss that is followed by a concerted cellular response in an attempt to restore the damaged tissue. Nevertheless, little is known about the signaling mechanisms governing the cellular response to injury. Here, we have established an adult ex vivo system that exhibits multiple hallmarks of spinal cord injury and allows the study of complex processes that are difficult to address using animal models. We have characterized the ependymal cell response to injury in this model system and found that ependymal cells can become activated, proliferate, migrate out of the central canal lining and differentiate in a manner resembling the in vivo situation...
June 3, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28554236/anaplastic-ependymoma-with-ganglionic-differentiation-report-of-a-rare-case-and-implications-in-diagnosis
#12
Shilpa Rao, Niveditha Ravindra, Nishanth Sadashiva, Bhagavatula Indira Devi, Vani Santosh
Ependymomas are glial neoplasms with rare cases exhibiting neuronal differentiation. We describe a case of spinal anaplastic ependymoma with ganglionic differentiation in a 28-year-old woman. The ganglionic component was labeled by synaptophysin, whereas the rest of the tumor showed features of an anaplastic ependymoma. Stem cell marker MELK was noted to stain both the neoplastic ependymal and ganglionic components, possibly suggesting a stem cell/progenitor origin for the tumor with subsequent divergent differentiation...
May 1, 2017: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28552073/intrastriatal-injection-of-%C3%AE-synuclein-can-lead-to-widespread-synucleinopathy-independent-of-neuroanatomic-connectivity
#13
Zachary A Sorrentino, Mieu M T Brooks, Vincent Hudson, Nicola J Rutherford, Todd E Golde, Benoit I Giasson, Paramita Chakrabarty
BACKGROUND: Prionoid transmission of α-synuclein (αSyn) aggregates along neuroanatomically connected projections is posited to underlie disease progression in α-synucleinopathies. Here, we specifically wanted to study whether this prionoid progression occurs via direct inter-neuronal transfer and, if so, would intrastriatal injection of αSyn aggregates lead to nigral degeneration. METHODS: To test prionoid transmission of αSyn aggregates along the nigro-striatal pathway, we injected amyloidogenic αSyn aggregates into two different regions of the striatum of adult human wild type αSyn transgenic mice (Line M20) or non-transgenic (NTG) mice and aged for 4 months...
May 29, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/28544147/short-term-fasting-promotes-insulin-expression-in-rat-hypothalamus
#14
Tamara B Dakic, Tanja V Jevdjovic, Mina I Peric, Ivana M Bjelobaba, Milica B Markelic, Bojana S Milutinovic, Iva V Lakic, Nebojsa I Jasnic, Jelena D Djordjevic, Predrag Z Vujovic
In the hypothalamus, insulin takes on many roles involved in energy homoeostasis. Therefore, the aim of this study was to examine hypothalamic insulin expression during the initial phase of the metabolic response to fasting. Hypothalamic insulin content was assessed by both radioimmunoassay and Western blot. The relative expression of insulin mRNA was examined by qPCR. Immunofluorescence and immunohistochemistry were used to determine the distribution of insulin immunopositivity in the hypothalamus. After 6-h fasting, both glucose and insulin levels were decreased in serum but not in the cerebrospinal fluid...
May 20, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28521038/ventricular-zone-disruption-in-human-neonates-with-intraventricular-hemorrhage
#15
James P McAllister, Maria Montserrat Guerra, Leandro Castaneyra Ruiz, Antonio J Jimenez, Dolores Dominguez-Pinos, Deborah Sival, Wilfred den Dunnen, Diego M Morales, Robert E Schmidt, Esteban M Rodriguez, David D Limbrick
To determine if ventricular zone (VZ) and subventricular zone (SVZ) alterations are associated with intraventricular hemorrhage (IVH) and posthemorrhagic hydrocephalus, we compared postmortem frontal and subcortical brain samples from 12 infants with IVH and 3 nonneurological disease controls without hemorrhages or ventriculomegaly. Birth and expiration estimated gestational ages were 23.0-39.1 and 23.7-44.1 weeks, respectively; survival ranges were 0-42 days (median, 2.0 days). Routine histology and immunohistochemistry for neural stem cells (NSCs), neural progenitors (NPs), multiciliated ependymal cells (ECs), astrocytes (AS), and cell adhesion molecules were performed...
May 1, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28511899/signaling-pathways-to-and-from-the-hypophysial-pars-tuberalis-an-important-center-for-the-control-of-seasonal-rhythms
#16
REVIEW
Horst-Werner Korf
Seasonal (circannual) rhythms play an important role for the control of body functions (reproduction, metabolism, immune responses) in nearly all living organisms. Also humans are affected by the seasons with regard to immune responses and mental functions, the seasonal affective disorder being one of the most prominent examples. The hypophysial pars tuberalis (PT), an important interface between the hypophysial pars distalis and neuroendocrine centers in the brain, plays an essential role in the regulation of seasonal functions and may even be the seat of the circannual clock...
May 13, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28502321/cytomegalovirus-in-the-human-dentate-gyrus-and-its-impact-on-neural-progenitor-cells-report-of-two-cases
#17
Ju-Yoon Yoon, Brett Danielson, Derek Mathis, Jason Karamchandani, David G Munoz
Congenital cytomegalovirus (CMV) infection in the 2nd and 3rd trimester results in catastrophic CNS abnormalities. This susceptibility is thought to result from the high proportion of neural stem cells in the developing brain. In immunocompromised adults, CNS infection by CMV preferentially affects ependymal surfaces, from where it expands to involve the parenchyma. Experimental models of murine CMV infection demonstrate viral tropism for the dentate gyrus (DG) and subventricular zone, the areas in which adult neurogenesis occurs...
May 15, 2017: Clinical Neuropathology
https://www.readbyqxmd.com/read/28501652/a-new-adenovector-system-for-implementing-thymulin-gene-therapy-for-inflammatory-disorders
#18
María F Zappa-Villar, Micaela López-León, Joaquín Pardo, Mariana Costa, Rosana Crespo, Mireille Dardenne, Rodolfo G Goya, Paula C Reggiani
Thymulin is a thymic peptide possessing anti-inflammatory effects. In order to manipulate thymulin expression in gene therapy studies, we built a bidirectional regulatable two-vector Tet-Off system and the corresponding control system. The experimental two-vector system, ETV, consists of a recombinant adenovector (RAd) harboring an expression cassette centered on a Tet-Off bidirectional promoter flanked by a synthetic gene for thymulin and the gene for humanized Green Fluorescent Protein (hGFP). The second adenovector of this system, RAd-tTA, constitutively expresses the regulatory protein tTA...
May 11, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28500065/loss-of-mpdz-impairs-ependymal-cell-integrity-leading-to-perinatal-onset-hydrocephalus-in-mice
#19
Anja Feldner, M Gordian Adam, Fabian Tetzlaff, Iris Moll, Dorde Komljenovic, Felix Sahm, Tobias Bäuerle, Hiroshi Ishikawa, Horst Schroten, Thomas Korff, Ilse Hofmann, Hartwig Wolburg, Andreas von Deimling, Andreas Fischer
Hydrocephalus is a common congenital anomaly. LCAM1 and MPDZ (MUPP1) are the only known human gene loci associated with non-syndromic hydrocephalus. To investigate functions of the tight junction-associated protein Mpdz, we generated mouse models. Global Mpdz gene deletion or conditional inactivation in Nestin-positive cells led to formation of supratentorial hydrocephalus in the early postnatal period. Blood vessels, epithelial cells of the choroid plexus, and cilia on ependymal cells, which line the ventricular system, remained morphologically intact in Mpdz-deficient brains...
July 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28470423/rat-brain-glucose-transporter-2-insulin-receptor-and-glial-expression-are-acute-targets-of-intracerebroventricular-streptozotocin-risk-factors-for-sporadic-alzheimer-s-disease
#20
A Knezovic, A Loncar, J Homolak, U Smailovic, J Osmanovic Barilar, L Ganoci, N Bozina, P Riederer, Melita Salkovic-Petrisic
Accumulated evidence suggests that the insulin-resistant brain state and cerebral glucose hypometabolism might be the cause, rather than the consequence, of the neurodegeneration found in a sporadic Alzheimer's disease (sAD). We have explored whether the insulin receptor (IR) and the glucose transporter-2 (GLUT2), used here as their markers, are the early targets of intracerebroventricularly (icv) administered streptozotocin (STZ) in an STZ-icv rat model of sAD, and whether their changes are associated with the STZ-induced neuroinflammation...
June 2017: Journal of Neural Transmission
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