Meningiomas are classified by the World Health Organization (WHO) in three grades, based on morphological features. Independent of this grading, the presence of calcification in meningiomas influences their growth rate. The messenger RNA of matrix Gla protein (MGP), an extra-hepatic protein with different conformations involved in the homeostasis of ectopic calcification has been found in meningiomas and was shown to be regulated in breast cancer by miR-155-5p, a specific micro RNA. Therefore, we investigated the expression of miR-155-5p and its relationship with local MGP conformations in different grade meningiomas. According to the WHO classification, our 41 samples of meningiomas were stratified in groups WHO I and WHO II. Using real time polymerase chain reaction, we observed a higher miR-155-5p expression in group WHO I versus group WHO II [with a fold change (FC) of 3.83, p=0.027)]. Moreover, the expression of miR-155-5p was higher in calcified tumors compared to non-calcified tumors in all samples (FC=3.01, p=0.047) and in group WHO I (FC=3.65, p=0.048). Utilizing immunohistochemistry, we determined the concurrent presence of all MGP conformations in calcified meningiomas. This study was the first to establish higher miR-155-5p expression in grade WHO I and calcified meningiomas, which could improve molecular classification and targeted therapy and also the presence of all MGP conformations in calcified meningiomas, confirming the existence of an anti-calcification mechanism in meningiomas..
Keywords
- histology
- biochemistry
- molecular biology
- experimental laboratory and clinical studies
Effects of nitroglycerin combined with continuous regional arterial infusion on severe acute pancreatitis, triglyceride, inflammatory factors and prognosis MMP-2 and MMP-9 gene polymorphisms and risk of head and neck carcinomas Proposal of a prediction model for prognosis of patients with acute myocardial infarction after percutaneous coronary intervention based on galectin-3 and soluble growth stimulating expressed gene 2 levels Crinum latifolium extract inhibits lipopolysaccharide-induced inflammation in human macrophages Approaching Risk Management in Medical Laboratories Non-inhibitory effects of the potent antioxidant C-phycocyanin fromPlectonema sp. on thein vitro glycation reactionAssociations of serum expressions of miR-499 and sex determining region Y-box 6 with prognosis of acute myocardial infarction patients Matrix-assisted Laser Desorption Ionization–Time of Flight Mass Spectrometry (MALDI-TOF MS) for subgingival bacteriome identification in a group of treated periodontitis patients: a case series Clinical significance of serum HMGB1 in COPD and correlation with severity of airflow restriction and immune function Snapshot of resistance and virulence features in ESCAPE strains frequently isolated from surgical wound infections in a Romanian hospital