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Feng Wang, Di Fan, Jun Qian, Zhe Zhang, Jianhua Zhu, Jian Chen
Diagnosis of tumour hypoxia is an important aspect in determining the course of tumour therapy. In this study, we developed a novel imaging agent, (99m)Tc-ethylenedicysteine-bis-misonidazole ((99m)Tc-EC-MISO), for diagnosing tumour hypoxia. We used 2-nitroimidazole as a reactant to synthesize the amino derivative of misonidazole (MISO) in the first step and then conjugated the di-amino derivative of MISO to the chelating agent ethylenedicysteine (EC) for labelling (99m)Tc in the second step. (99m)Tc-pertechnetate ((99m)TcO4-) was reduced by tin chloride (SnCl2) for radiolabeling...
2015: Medicinal Chemistry
M Gautier, I Dhennin-Duthille, A S Ay, P Rybarczyk, I Korichneva, H Ouadid-Ahidouch
The aim of this review is to address the recent advances regarding the use of pharmacological agents to target transient receptor potential (TRP) channels in cancer and their potential application in therapeutics. Physiologically, TRP channels are responsible for cation entry (Ca(2+) , Na(+) , Mg(2+) ) in many mammalian cells and regulate a large number of cellular functions. However, dysfunction in channel expression and/or activity can be linked to human diseases like cancer. Indeed, there is growing evidence that TRP channel expression is altered in cancer tissues in comparison with normal ones...
May 2014: British Journal of Pharmacology
G M Yusubalieva, V P Baklaushev, O I Gurina, E B Tsitrin, V P Chekhonin
In experiments on Wistar rats with experimental C6 glioma, the immunohistochemical features of the astroglial reaction over 30 days after implantation were characterized. The formation of a glial border consisting of GFAP-positive reactive astrocytes at the periphery of C6 glioma was observed on postimplantation day 3 and until the death of the experimental animals. Reactive astrocytes encompassed not only the primary gliomal focus, but all tumor invasion foci. Quantitative assessment of astroglial reaction around glioma was carried out with immunofluorescent assay of glial fibrillary acidic protein (GFAP) on cerebral sections...
July 2010: Bulletin of Experimental Biology and Medicine
V J Balcar, A Schousboe, P E Spoerri, J R Wolff
High affinity uptake of [(3)H]l-glutamate was studied in cultures of continuous cell lines, originating either from mouse neuroblastoma or rat glioma, and in two types of primary cultures containing cerebellar granule cells and astrocytes from cerebral cortex, respectively. In the continuous lines, d- and l-aspartate-4-hydroxamate were found to interact preferentially with the uptake of [(3)H]l-glutamate in glioma cells while l-glutamate-5-hydroxamate and 2-aminoadipate interacted more strongly with [(3)H]l-glutamate uptake in neuroblastoma cells, d-Aspartate-4-hydroxyamate, l-glutamate-5-hydroxamate and 2-aminoadipate were inactive as inhibitors of [(3)H]l-glutamate uptake by either granule cells or astrocytes, grown in primary culture, but several other glutamate analogues, which did not differentiate between neuroblastomal and gliomal uptake of [(3)H]l-glutamate, were somewhat stronger inhibitors of [(3)H]l-glutamate uptake in astrocytes as compared to that in granule cells...
1987: Neurochemistry International
Mitsuaki Shirahata, Shigeyuki Oba, Kyoko Iwao-Koizumi, Sakae Saito, Noriko Ueno, Masashi Oda, Nobuo Hashimoto, Shin Ishii, June A Takahashi, Kikuya Kato
Histopathological classification of gliomas is often clinically inadequate due to the diversity of tumors that fall within the same class. The goal of the present study was to identify prognostic molecular features in diffusely infiltrating gliomas using gene expression profiling. We selected 3456 genes expressed in gliomas, including 3012 genes found in a gliomal expressed sequence tag collection. The expression levels of these genes in 152 gliomas (100 glioblastomas, 21 anaplastic astrocytomas, 19 diffuse astrocytomas, and 12 anaplastic oligodendrogliomas) were measured using adapter-tagged competitive polymerase chain reaction, a high-throughput reverse transcription-polymerase chain reaction technique...
January 2009: Cancer Science
A Sharif, P Legendre, V Prévot, C Allet, L Romao, J-M Studler, H Chneiweiss, M-P Junier
An instability of the mature cell phenotype is thought to participate to the formation of gliomas, primary brain tumors deriving from astrocytes and/or neural stem cells. Transforming growth factor alpha (TGFalpha) is an erbB1 ligand overexpressed in the earliest stages of gliomas, and exerts trophic effects on gliomal cells and astrocytes. Here, we questioned whether prolonged TGFalpha exposure affects the stability of the normal mature astrocyte phenotype. We first developed astrocyte cultures devoid of residual neural stem cells or progenitors...
April 26, 2007: Oncogene
D A Eavarone, X Yu, R V Bellamkonda
Recent advances in liposome technology have shown promise relative to the introduction of chemotherapeutic agents with reduced toxicity, extended longevity, and potential for cell-specific targeting. In this study we report the engineering of a liposomal delivery system for the chemotherapeutic drug doxorubicin. The system was targeted specifically to C6 glioma in vitro by coupling transferrin to the distal ends of liposomal polyethylene glycol (PEG) chains. The transferrin receptor is overexpressed on glioma, with the extent of overexpression correlated to the severity of the tumor...
July 2000: Journal of Biomedical Materials Research
H E Kim, J H Oh, S K Lee, Y J Oh
We used the rat C6 gliomal cell line to investigate the potential role of ginsenoside Rh2 (G-Rh2) in brain tumor. G-Rh2 induced many apoptotic manifestations in C6 gliomal cells as evidenced by changes in cell morphology, generation of DNA fragmentation, activation of caspase and production of reactive oxygen species (ROS). As a result, cotreatment with antioxidants or a broad-spectrum caspase inhibitor, N-benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone effectively attenuated G-Rh2-induced cell death. However, specific cleavage of poly(ADP-ribose)polymerase into 85 kDa protein was not detected as demonstrated in many other apoptotic paradigms...
1999: Life Sciences
X Collet, O Francone, F Besnard, C J Fielding
The ability of different human and rat brain cell lines (neuronal and gliomal) to secrete lecithin:cholesterol acyltransferase (LCAT) was examined. Of these, the strongly secreting human gliomal (U343 and U251) cell lines were selected for a detailed study of enzymatic and structural properties of the secreted LCAT. Both plasma- and brain-derived enzymes are inhibited by DTNB (90%) and are activated by apolipoprotein A-I. LCAT mRNA was measured in these cell lines at levels similar to that found in HepG2 cells...
April 29, 1999: Biochemical and Biophysical Research Communications
R L Kohl, J R Perez-Polo, W B Quay
Human neuroblastoma SK-N-SH-SY5Y (5Y) and rat glioma (C6) cells were cultured with supplemental methionine, glycine, or serine for three to six days. Serine hydroxmethyltransferase (SHMT: L-serine: tetrahydrofolate 5, 10-hydroxymethyltransferase, EC 2.12.1) was assayed radiometrically in whole cell homogenates, crude supernatant fractions and crude particulate fractions. No significant changes in specific activity or cellular morphology were noted at methionine, glycine, or serine concentrations up to 16 mM...
1980: Journal of Neuroscience Research
G Grunberger, W L Lowe, A McElduff, R P Glick
The insulin receptor from human brain tumors of glial origin was examined for the first time using intact cells (from an established cultured human glioblastoma cell line) and partially purified solubilized membranes (from cultured cells and freshly isolated human brain tumors). The structure of the glial insulin receptor subunits was assessed by affinity cross-linking of 125I-insulin with the alpha-subunit of the receptor, neuraminidase treatment of the cross-linked receptor, behavior of the receptor on lectin columns, and electrophoretic mobility of the phosphorylated beta-subunit...
March 1986: Journal of Clinical Investigation
M Salcman
The many options neurologic surgeons have for the treatment of malignant gliomas are reviewed. Although virtually no malignant gliomal tumor can be cured by surgical resection alone, in the majority of cases, some combination of open resection or stereotactic surgery can produce a diagnosis, ameliorate symptoms, decrease the intracranial pressure, improve neurologic status, remove most of the tumor, and deliver other therapeutic agents. The techniques of both open resection and stereotactic surgery are discussed...
January 1990: Neurosurgery Clinics of North America
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