Proteomics Study of Mesenchymal Stem Cell-Like Cells Isolated from Cerebrospinal Fluid of Patients with Meningioma

Background: Cerebrospinal fluid (CSF) contains pro-growth factors that can affect proliferation, migration and differentiation of Mesenchymal Stem Cells (MSCs). Objective: This study aimed to isolate MSC like cells from CSF of patients with meningioma and psudotumorcerebri (PTC) and identify differentially expressed proteins in these cells. Methods: Five patients with newly diagnosed intracranial meningioma and five patients with PTC were recruited in this comparative proteomics study. MSCs were isolated from CSF and validated by mesenchyml and non-mesenchyml fluorochrome antibodies, and flow cytometer analysis. Two- Dimensional Gel Electrophoresis (2-DE) coupled with Mass Spectrometry (MS) was performed to identify differentially expressed proteins. Results: Microscopic views of the isolated cells as well as flow cytometer analysis were found to be compatible with MSC-like cells. Eight distinct protein spots were differentially and reproducibly expressed among the stained gels of two studied groups. The identified proteins were Phosphoglycerate Mutase 1 (PGAM1), LIM and SH3 domain protein (LASP1), peroxiredoxin-6 (PRDX-6), type I cytoskeletal 9 (KRT9), Superoxide Dismutase (SOD), endoplasmin, Stathmin 1 (STMN1), and glutathione S-transferase (GST). Conclusion: This study provides new insights into the plausible role of CSF derived MSCs in cancer progression, and reveals a promising therapeutic opportunity for targeting of MSC proteins in patients with meningioma.