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https://www.readbyqxmd.com/read/27934764/gliogenic-ltp-spreads-widely-in-nociceptive-pathways
#1
M T Kronschläger, R Drdla-Schutting, M Gassner, S D Honsek, H L Teuchmann, J Sandkühler
Learning and memory formation involve long-term potentiation (LTP) of synaptic strength. A fundamental feature of LTP induction in the brain is the need for coincident pre- and postsynaptic activity. This restricts LTP expression to activated synapses only (homosynaptic LTP) and leads to its input specificity. In the spinal cord, we discovered a fundamentally different form of LTP that is induced by glial cell activation and mediated by diffusible, extracellular messengers, including d-serine and tumor necrosis factor (TNF), and that travel long distances via the cerebrospinal fluid, thereby affecting susceptible synapses at remote sites...
December 2, 2016: Science
https://www.readbyqxmd.com/read/27923049/expression-of-lncrnas-in-low-grade-gliomas-and-glioblastoma-multiforme-an-in-silico-analysis
#2
Brian J Reon, Jordan Anaya, Ying Zhang, James Mandell, Benjamin Purow, Roger Abounader, Anindya Dutta
BACKGROUND: Each year, over 16,000 patients die from malignant brain cancer in the US. Long noncoding RNAs (lncRNAs) have recently been shown to play critical roles in regulating neurogenesis and brain tumor progression. To better understand the role of lncRNAs in brain cancer, we performed a global analysis to identify and characterize all annotated and novel lncRNAs in both grade II and III gliomas as well as grade IV glioblastomas (glioblastoma multiforme [GBM]). METHODS AND FINDINGS: We determined the expression of all lncRNAs in over 650 brain cancer and 70 normal brain tissue RNA sequencing datasets from The Cancer Genome Atlas (TCGA) and other publicly available datasets...
December 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27919332/effects-of-ionizing-radiation-on-the-mammalian-brain
#3
Daniela Hladik, Soile Tapio
Epidemiological studies on the atomic-bomb survivors, cancer survivors and occupational cohorts provide strong evidence for multifaceted damage to brain after ionizing radiation. Radiation-induced late effects may manifest as brain tumors or cognitive impairment. Decreased neurogenesis and differentiation, alteration in neural structure and synaptic plasticity as well as increased oxidative stress and inflammation are suggested to contribute to adverse effects in the brain. In addition to neural stems cells, several brain-specific mature cell types including endothelial and glial cells are negatively affected by ionizing radiation...
October 2016: Mutation Research
https://www.readbyqxmd.com/read/27917302/characterization-of-the-blood-brain-barrier-in-pediatric-central-nervous-system-neoplasms
#4
Christopher S Hong, Winson Ho, Martin G Piazza, Abhik Ray-Chaudhury, Zhengping Zhuang, John D Heiss
OBJECTIVE: The normal blood-brain barrier (BBB) is composed of tight junctions between endothelial cells and surrounding astrocyte foot processes. Breakdown of the physiological astrocyte-endothelial cell relationship occurs in adult metastatic and primary brain tumors. However, the astrocyte-endothelial cell relationship has not been studied in pediatric tumors. MATERIALS AND METHODS: Utilizing specimens from cases of pilocytic astrocytoma (n = 5), medulloblastoma (n = 5), and low-grade diffuse astrocytoma (n = 1), immunofluorescence were performed using primary antibodies against CD31, glial fibrillary acidic protein (GFAP), and aquaporin 4 (AQ4)...
2016: Journal of Interdisciplinary Histopathology
https://www.readbyqxmd.com/read/27915062/rosette-forming-glioneuronal-tumor-originating-from-the-spinal-cord-report-of-two-cases-and-literature-review
#5
Lian Duan, Yunkun Zhang, Weilun Fu, Sumin Geng
Rosette-forming glioneuronal tumor (RGNT) is a recently recognized and rarely encountered tumor occurring in the fourth ventricle. Histologically, it is composed by two distinct features: a glial component, resembling pilocytic astrocytoma, and a neurocytic component forming neurocytic rosettes and/or perivascular rosettes. The authors describe two extremely rare cases of RGNT arising from the spinal cord, which were misdiagnosed as ependymoma and astrocytoma preoperatively. Symptoms included dissociated sensory disturbance, episodic pain and fatigue, as well as motor disturbance, had been presented for two years and two months, respectively...
November 30, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27913619/the-caenorhabditis-elegans-nf2-merlin-molecule-nfm-1-non-autonomously-regulates-neuroblast-migration-and-interacts-genetically-with-the-guidance-cue-slt-1-slit
#6
Matthew P Josephson, Rana Aliani, Megan L Norris, Matthew E Ochs, Mahekta Gujar, Erik A Lundquist
During nervous system development, neurons and their progenitors migrate to their final destinations. In Caenorhabditis elegans, the bilateral Q neuroblasts and their descendants migrate long distances in opposite directions, despite being born in the same posterior region. QR on the right migrates anteriorly and generates the AQR neuron positioned near the head, and QL on the left migrates posteriorly, giving rise to the PQR neuron positioned near the tail. In a screen for genes required for AQR and PQR migration, we identified an allele of nfm-1, which encodes a molecule similar to vertebrate NF2/Merlin, an important tumor suppressor in humans...
December 2, 2016: Genetics
https://www.readbyqxmd.com/read/27900014/pituicytoma-a-report-of-three-cases-and-literature-review
#7
Xiaoyu Yang, Xiaoliang Liu, Wensen Li, Dawei Chen
Pituicytoma is a rare tumor of the sellar and suprasellar regions, arising from the pituicytes, which are specialized glial cells in the neurohypophysis and infundibulum. Due to its rarity, ambiguity persists over the diagnosis, management and prognosis of pituicytoma. The current study presents a case series of three patients, each with a histopathological diagnosis of pituicytoma. A summary of the clinical manifestations, radiological characteristics, histopathological features, treatment strategies and prognoses are presented...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27895759/globose-cystic-olfactory-ensheathing-cell-tumor-a-case-report-and-literature-review
#8
Yaoling Liu, Minghai Wei, Kang Yang, Zeshi Tan, Xu Sun, Xinyu Li, Ningwei Che, Lan Luan, Guanyu Wang, Xiaofeng Wang, Yuqiang Sun, Jian Yin
Olfactory ensheathing cell tumor (OECT) is one of the most rare intracranial, extra-axial tumors located in the anterior cranial fossa. The present study reports a case of a 34-year-old female patient who presented with a history of hyposmia for 1 year, as well as a gradual dizziness and emotional lability for 2 months. Magnetic resonance imaging of the brain revealed a globose, well-defined cystic mass at the midline of the anterior cranial fossa, which was confirmed as an OECT by histology and was completely resected by bifrontal craniotomy...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27893178/comprehensive-genetic-characterization-of-rosette-forming-glioneuronal-tumors-independent-component-analysis-by-tissue-microdissection
#9
Yohei Kitamura, Takashi Komori, Makoto Shibuya, Kentaro Ohara, Yuko Saito, Saeko Hayashi, Aya Sasaki, Eiji Nakagawa, Ryosuke Tomio, Akiyoshi Kakita, Masashi Nakatsukasa, Kazunari Yoshida, Hikaru Sasaki
A rosette-forming glioneuronal tumor (RGNT) is a rare, mixed neuronal-glial tumor characterized by biphasic architecture of glial and neurocytic components. The number of reports of genetic analyses of RGNTs is few. Additionally, the genetic background of the unique biphasic pathological characteristics of such mixed neuronal-glial tumors remains unclear. To clarify the genetic background of RGNTs, we performed separate comprehensive genetic analyses of glial and neurocytic components of five RGNTs, by tissue microdissection...
November 28, 2016: Brain Pathology
https://www.readbyqxmd.com/read/27889895/inflammatory-response-in-the-cns-friend-or-foe
#10
REVIEW
Marta Sochocka, Breno Satler Diniz, Jerzy Leszek
Inflammatory reactions could be both beneficial and detrimental to the brain, depending on strengths of their activation in various stages of neurodegeneration. Mild activation of microglia and astrocytes usually reveals neuroprotective effects and ameliorates early symptoms of neurodegeneration; for instance, released cytokines help maintain synaptic plasticity and modulate neuronal excitability, and stimulated toll-like receptors (TLRs) promote neurogenesis and neurite outgrowth. However, strong activation of glial cells gives rise to cytokine overexpression/dysregulation, which accelerates neurodegeneration...
November 26, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27889433/the-protective-effect-of-curcumin-in-olfactory-ensheathing-cells-exposed-to-hypoxia
#11
Roberta Bonfanti, Teresa Musumeci, Cristina Russo, Rosalia Pellitteri
Curcumin, a phytochemical component derived from the rhizomes of Curcuma longa, has shown a great variety of pharmacological activities, such as anti-inflammatory, anti-tumor, anti-depression and anti-oxidant activity. Therefore, in the last years it has been used as a therapeutic agent since it confers protection in different neurodegenerative diseases, cerebral ischemia and excitotoxicity. Olfactory Ensheathing Cells (OECs) are glial cells of the olfactory system. They are able to secrete several neurotrophic growth factors, promote axonal growth and support the remyelination of damaged axons...
November 23, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27888831/-extranasal-glioma-surgery-in-a-newborn-a-case-report
#12
Emel Cadallı Tatar, Gökçe Aksoy Yıldırım, Kemal Keseroğlu, Ali Özdek, Güleser Saylam, Mehmet Hakan Korkmaz, Reyhan Polat
Nasal gliomas are rarely seen, congenital, benign and nonhereditary lesions. These are not true tumors that occur due to extradural malposition of ectopic glial tissue during embryologic development. These are generally diagnosed during childbirth and may have an intracranial extension with fibrous stalk. Treatment of these masses that cause nasal obstruction and cosmetic deformity according to location, is total excision. In this case report, we present an extranasal glioma case whose surgery was done when she was 11 days old...
September 2016: Kulak Burun Boğaz Ihtisas Dergisi: KBB, Journal of Ear, Nose, and Throat
https://www.readbyqxmd.com/read/27888042/changes-in-neurotrophic-and-inflammatory-factors-in-the-cerebrospinal-fluid-of-patients-with-postherpetic-neuralgia
#13
Wenxing Zhao, Yong Wang, Qiwu Fang, Jianping Wu, Xinyou Gao, Hui Liu, Liu Cao, Jianxiong An
Inflammatory and neurotrophic factors are involved in postherpetic neuralgia (PHN), but the association of these factors in the cerebrospinal fluid (CSF) with the level of pain is poorly known. The present study aimed to examine the changes in neurotrophic and inflammatory factors in the CSF of patients with PHN and to study the correlation between these factors and the degree of pain. Fifty patients with PHN and 28 patients with hemifacial spasm (as controls) were recruited between May 2015 and March 2016...
November 23, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27881822/lowered-h3k27me3-and-dna-hypomethylation-define-poorly-prognostic-pediatric-posterior-fossa-ependymomas
#14
Jill Bayliss, Piali Mukherjee, Chao Lu, Siddhant U Jain, Chan Chung, Daniel Martinez, Benjamin Sabari, Ashley S Margol, Pooja Panwalkar, Abhijit Parolia, Melike Pekmezci, Richard C McEachin, Marcin Cieslik, Benita Tamrazi, Benjamin A Garcia, Gaspare La Rocca, Mariarita Santi, Peter W Lewis, Cynthia Hawkins, Ari Melnick, C David Allis, Craig B Thompson, Arul M Chinnaiyan, Alexander R Judkins, Sriram Venneti
Childhood posterior fossa (PF) ependymomas cause substantial morbidity and mortality. These tumors lack recurrent genetic mutations, but a subset of these ependymomas exhibits CpG island (CpGi) hypermethylation [PF group A (PFA)], implicating epigenetic alterations in their pathogenesis. Further, histological grade does not reliably predict prognosis, highlighting the importance of developing more robust prognostic markers. We discovered global H3K27me3 reduction in a subset of these tumors (PF-ve ependymomas) analogous to H3K27M mutant gliomas...
November 23, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27879444/histologic-and-immunohistochemical-analyses-of-soft-tissue-sarcomas-from-brca2-mutant-tp53-mutant-zebrafish-are-consistent-with-neural-crest-schwann-cell-origin
#15
L A White, J M Sexton, H R Shive
The zebrafish (Danio rerio) provides a powerful model for analyzing genetic contributors to cancer. Multiple zebrafish lines with cancer-associated genetic mutations develop soft tissue sarcomas that are histologically consistent with malignant peripheral nerve sheath tumor (MPNST). The goal of this study was to determine the phenotype of soft tissue sarcomas in a brca2-mutant/tp53-mutant zebrafish line using immunohistochemical markers that are commonly expressed in mammalian MPNST. We classified 70 soft tissue sarcomas from a brca2-mutant/tp53-mutant zebrafish cohort as MPNST, undifferentiated sarcoma, or other tumor based on histologic features...
November 22, 2016: Veterinary Pathology
https://www.readbyqxmd.com/read/27877908/an-immuno-wall-microdevice-exhibits-rapid-and-sensitive-detection-of-idh1-r132h-mutation-specific-to-grade-ii-and-iii-gliomas
#16
Akane Yamamichi, Toshihiro Kasama, Fumiharu Ohka, Hiromichi Suzuki, Akira Kato, Kazuya Motomura, Masaki Hirano, Melissa Ranjit, Lushun Chalise, Michihiro Kurimoto, Goro Kondo, Kosuke Aoki, Noritada Kaji, Manabu Tokeshi, Toshio Matsubara, Takeshi Senga, Mika K Kaneko, Hidenori Suzuki, Masahito Hara, Toshihiko Wakabayashi, Yoshinobu Baba, Yukinari Kato, Atsushi Natsume
World Health Organization grade II and III gliomas most frequently occur in the central nervous system (CNS) in adults. Gliomas are not circumscribed; tumor edges are irregular and consist of tumor cells, normal brain tissue, and hyperplastic reactive glial cells. Therefore, the tumors are not fully resectable, resulting in recurrence, malignant progression, and eventual death. Approximately 69-80% of grade II and III gliomas harbor mutations in the isocitrate dehydrogenase 1 gene (IDH1), of which 83-90% are found to be the IDH1-R132H mutation...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27867915/surgical-resection-of-non-glial-tumors-in-the-motor-cortex
#17
Seong-Jong Lee, Sun-Chul Hwang, Soo Bin Im, Bum-Tae Kim
BACKGROUND: Direct surgery to resect tumors in the motor cortex could improve neurological symptoms or cause novel motor weakness. The present study describes the neurological outcomes of patients after the surgical resection of non-glial tumors in the primary motor cortex. METHODS: The present study included 25 patients who had pathologically confirmed non-glial tumors in the motor cortex for which they underwent surgery. Tumor location was verified using anatomical landmarks on preoperative magnetic resonance imaging scans...
October 2016: Brain Tumor Research and Treatment
https://www.readbyqxmd.com/read/27867119/glioblastoma-secondary-to-meningioma-a-case-report-and-literature-review
#18
Pauline Sahuc, Christophe Joubert, Anh-Tuan Nguyen, Bernard Fouet, Delphine Wybrecht, Anthony Faivre, Philippe Alla, Arnaud Dagain
BACKGROUND: The pathophysiologies underlying meningioma and glioma are quite distinct. The coexistence of those two lesions in a same patient is rare, and that at the same location is even more exceptional. CASE DESCRIPTION: We report a case of a 79-year-old man initially presenting a meningioma that was treated by complete excision of the lesion. The patient had two relapses at the same site in which glioblastoma was confirmed histopathologically. CONCLUSIONS: Glial transformation meningiomas remains a contentious issue, with coincidental occurrence being the most prevalent explanation...
November 17, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27863440/patient-derived-glioblastoma-stem-cells-respond-differentially-to-targeted-therapies
#19
Pratik Kanabur, Sujuan Guo, Gary R Simonds, Deborah F Kelly, Robert G Gourdie, Scott S Verbridge, Zhi Sheng
The dismal prognosis of glioblastoma is, at least in part, attributable to the difficulty in eradicating glioblastoma stem cells (GSCs). However, whether this difficulty is caused by the differential responses of GSCs to drugs remains to be determined. To address this, we isolated and characterized ten GSC lines from established cell lines, xenografts, or patient specimens. Six lines formed spheres in a regular culture condition, whereas the remaining four lines grew as monolayer. These adherent lines formed spheres only in plates coated with poly-2-hydroxyethyl methacrylate...
November 16, 2016: Oncotarget
https://www.readbyqxmd.com/read/27860162/desmoplastic-infantile-astrocytoma-ganglioglioma-with-rare-braf-v600d-mutation
#20
Ashley Greer, Nicholas K Foreman, Andrew Donson, Kurtis D Davies, B K Kleinschmidt-DeMasters
BACKGROUND: Desmoplastic infantile astrocytoma (DIA) and desmoplastic infantile gangliogliomas (DIGs) are rare, massive, cystic and solid tumors of infants usually found in superficial cerebral hemispheres. They manifest prominent desmoplastic stroma, admixed neoplastic astrocytes, primitive-appearing small cells, and additional neoplastic ganglion cells in the case of DIGs. While v-Raf murine sarcoma viral oncogene homolog B (BRAF) mutation is found in up to 50% of pediatric gangliogliomas, two recent studies found that it was rare in DIA/DIGs; we sought to assess BRAF status in DIA/DIGs from our institution...
November 10, 2016: Pediatric Blood & Cancer
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