Polyacrylamide gel substrates that simulate the mechanical stiffness of normal and malignant neuronal tissues increase protoporphyin IX synthesis in glioma cells
| Autor: | Rachel Wan, Yu Sun, Carl Fisher, Lothar Lilge, Carolyn Niu, Reginald Birngruber, Hoda Maleki, Kira Scheffler, Haijiao Liu, Craig A. Simmons |
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| Rok vydání: | 2015 |
| Předmět: |
Pathology
medicine.medical_specialty medicine.medical_treatment Cell Biomedical Engineering Acrylic Resins Protoporphyrins Photodynamic therapy Cell Count Biomaterials chemistry.chemical_compound Tissue culture Glioma Cell Line Tumor medicine Humans Cell Proliferation Protoporphyrin IX Chemistry Cell growth medicine.disease Atomic and Molecular Physics and Optics In vitro Elasticity Electronic Optical and Magnetic Materials medicine.anatomical_structure Cellular Microenvironment Photochemotherapy Cell culture Cancer research Glioblastoma |
| Zdroj: | Journal of biomedical optics. 20(9) |
| ISSN: | 1560-2281 |
| Popis: | Protoporphyrin IX (PPIX) produced following the administration of exogenous 5d-aminolevulinic acid is clinically approved for photodynamic therapy and fluorescence-guided resection in various jurisdictions around the world. For both applications, quantification of PPIX forms the basis for accurate therapeutic dose calculation and identification of malignant tissues for resection. While it is well established that the PPIX synthesis and accumulation rates are subject to the cell’s biochemical microenvironment, the effect of the physical microenvironment, such as matrix stiffness, has received little attention to date. Here we studied the proliferation rate and PPIX synthesis and accumulation in two glioma cell lines U373 and U118 cultured under five different substrate conditions, including the conventional tissue culture plastic and polyacrylamide gels that simulated tissue stiffness of normal brain (1 kPa) and glioblastoma tumors (12 kPa). We found that the proliferation rate increased with substrate stiffness for both cell lines, but not in a linear fashion. PPIX concentration was significantly higher in cells cultured on tissue-simulating gels than on the much stiffer tissue culture plastic for both cell lines. These findings, albeit preliminary, suggest that the physical microenvironment might be an important determinant of tumor aggressiveness and PPIX synthesis in glioma cells. |
| Databáze: | OpenAIRE |
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