Brain gliomas and growth factors: immunohistochemical, immunofluorescence, flow cytometry and RT-PCR profile in pediatric age.

Brain gliomas and growth factors: immunohistochemical, immunofluorescence, flow cytometry and RT-PCR profile in pediatric age. J Biol Regul Homeost Agents. 2019 Sep 10;33(5) Authors: Taurone S, Spoletini M, Chiappetta C, Di Gioia C, Carletti R, Greco A, Agostinelli E, Ralli M, Giangaspero F, Artico M, Pastore FS, Scarpa S, Gobbi P, Di Liddo R Abstract Gliomas represent over 50% of tumors occurring in children. Evidence suggests that glioma stem cells (GSCs), maintained by the transforming growth factor-beta (TGF-β1) pathway, and vascularization substantially contribute to tumor aggressiveness. The identification of important angiogenic factors such as vascular endothelial growth factor (VEGF) may represent a crucial step in the therapeutic approach against tumor growth and metastatic diffusion. The aim of this study was to identify the expression of TGF-β1, VEGF and VEGF-receptors in brain gliomas. Specimens of 16 gliomas and 4 controls from children aged 0.2-14 years were used in the study. Immunohistochemical analysis and gene expression study from specimens was performed. Flow cytometry analysis on GSCs was performed to ascertain the expression of VEGF and VEGF-R2 in the tumor stem cell compartment. Newly diagnosed gliomas mainly showed moderate to strong VEGF immunostaining and increased expression of pro-inflammatory molecules in glioma cells. The proportion of TGF-β1 positive endothelial cells was markedly lower in normal brain vessel...
Source: Journal of Biological Regulators and Homeostatic Agents - Category: Biomedical Science Tags: J Biol Regul Homeost Agents Source Type: research

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The objective of this paper was to obtain monitored tumor-targeted therapeutic nanoparticles (NPs). To that end, theranostic surfactant-coated polymer poly-Lactic-co-Glycolic Acid (PLGA) nanoplatform encapsulating doxorubicin hydrochloride (DOX) and superparamagnetic iron oxide NPs (SPIONs) were developed. Different non-ionic surfactants known as BBB crossing enhancers (Tween 80, Brij-35, Pluronic F68 or Vitamin E-TPGS) were used to develop 4 types of theranostic nanoplatforms, which were characterized in terms of size and morphology by DLS, TEM and STEM-HAADF analyses. Moreover, the 3-month stability test, the therapeutic...
Source: European Journal of Pharmaceutics and Biopharmaceutics - Category: Drugs & Pharmacology Authors: Tags: Eur J Pharm Biopharm Source Type: research
Authors: Wang L, He Z Abstract Glioma, the most common and aggressive type of brain tumor, has a poor prognosis. Glioma stem cells (GSCs) are thought to be responsible for glioma genesis, proliferation, resistance to chemoradiotherapy, and recurrence. Long non-coding RNAs (lncRNAs) have been viewed as a prospective novel target in glioma therapy in recent years due to their functional roles in GSC biological processes. However, how lncRNAs interact with GSCs and the underlining mechanisms associated with these interactions are not yet clear. In this review, we briefly illustrate recent advancements in the functiona...
Source: Medical Science Monitor - Category: Research Tags: Med Sci Monit Source Type: research
ConclusionsWe were able to generate novel pediatric glioma mouse models that can be used to examine selected mutations found in human pediatric gliomas and serve as a pre-clinical tool for testing novel therapeutic targets.Legal entity responsible for the studyThe authors.FundingDKFZ-MOST grant.DisclosureAll authors have declared no conflicts of interest.
Source: Annals of Oncology - Category: Cancer & Oncology Source Type: research
In cancer cells, aberrant DNA methylation is commonly associated with transcriptional alterations, including silencing of tumor suppressor genes. However, multiple epigenetic mechanisms, including polycomb repressive marks, contribute to gene deregulation in cancer. To dissect the relative contribution of DNA methylation–dependent and –independent mechanisms to transcriptional alterations at CpG island/promoter-associated genes in cancer, we studied 70 samples of adult glioma, a widespread type of brain tumor, classified according to their isocitrate dehydrogenase (IDH1) mutation status. We found that most tran...
Source: Genome Research - Category: Genetics & Stem Cells Authors: Tags: RESEARCH Source Type: research
We investigated by immunohistochemistry the clinical significance and the evolution of Oligodendrocyte lineage transcription factor 2 (OLIG2) and cyclin D2 (CCND2) protein expression, two markers highly specific of glioma stem cells, on a cohort of human paired glioblastoma samples comparing initial resections with recurrent tumors after radiation therapy alone or radio ‐chemotherapy with temozolomide according to the Stupp regimen. Our study highlighted for the first time the prognostic value of high nuclear expression of CCND2 at initial surgery which is associated with early mortality and patients for whom nuclear exp...
Source: Cancer Medicine - Category: Cancer & Oncology Authors: Tags: ORIGINAL RESEARCH Source Type: research
Conclusion: KLRC2 could be a novel cellular marker for brain tumor-initiating cells. PMID: 31556357 [PubMed - as supplied by publisher]
Source: Neurological Research - Category: Neurology Tags: Neurol Res Source Type: research
Publication date: December 2019Source: Biomedicine &Pharmacotherapy, Volume 120Author(s): Fan Feng, Moxuan Zhang, Chuanchao Yang, Xueyuan Heng, Xiujie WuAbstractAutophagy, a self-digestion intracellular catabolic process, plays a crucial role in cellular homeostasis under conditions of starvation, oxidative stress and genotoxic stress. The capability of maintaining homeostasis contributes to preventing malignant behavior in normal cells. Many studies have provided compelling evidence that autophagy is involved in brain tumor recurrence and chemotherapy and radiotherapy resistance. Gliomas, as the primary central nervou...
Source: Biomedicine and Pharmacotherapy - Category: Drugs & Pharmacology Source Type: research
In cancer cells, aberrant DNA methylation is commonly associated with transcriptional alterations, including silencing of tumor suppressor genes. However, multiple epigenetic mechanisms, including polycomb repressive marks, contribute to gene deregulation in cancer. To dissect the relative contribution of DNA methylation–dependent and –independent mechanisms to transcriptional alterations at CpG island/promoter-associated genes in cancer, we studied 70 samples of adult glioma, a widespread type of brain tumor, classified according to their isocitrate dehydrogenase (IDH1) mutation status. We found that most tran...
Source: Genome Research - Category: Genetics & Stem Cells Authors: Tags: RESEARCH Source Type: research
Abstract Autophagy, a self-digestion intracellular catabolic process, plays a crucial role in cellular homeostasis under conditions of starvation, oxidative stress and genotoxic stress. The capability of maintaining homeostasis contributes to preventing malignant behavior in normal cells. Many studies have provided compelling evidence that autophagy is involved in brain tumor recurrence and chemotherapy and radiotherapy resistance. Gliomas, as the primary central nervous system (CNS) tumors, are characterized by rapid, aggressive growth and recurrence and have a poor prognosis and bleak outlook even with modern mu...
Source: Biomedicine and pharmacotherapy = Biomedecine and pharmacotherapie - Category: Drugs & Pharmacology Authors: Tags: Biomed Pharmacother Source Type: research
ConclusionsThe present study suggests that overexpression ofCD44 is associated with a poor prognosis for grade II/III glioma patients. Moreover, our findings suggest thatCD44 could serve as a prognostic biomarker in grade II/III glioma patients.
Source: Journal of Neuro-Oncology - Category: Cancer & Oncology Source Type: research
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