Studies on neuronal differentiation and signalling processes with a novel impedimetric biosensor

• Published in: Biosensors & bioelectronics Vol. 26; no. 4; pp. 1407 - 1413
• Main Authors: Valero, T., Moschopoulou, G., Kintzios, S., Hauptmann, P., Naumann, M., Jacobs, T.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 15-12-2010; Elsevier
• Subjects: Animals; Biological and medical sciences; Biosensing Techniques - instrumentation; Biosensing Techniques - methods; Biosensors; Biotechnology; Cell Count; Cell Differentiation; Cell Line; Cell Survival; Cells, Immobilized; Collagen; Culture Media, Serum-Free; Dielectric Spectroscopy; Electrical impedance spectroscopy; Fundamental and applied biological sciences. Psychology; Impedimetric biosensor; Laminin; Methods. Procedures. Technologies; Mice; Neural differentiation; Neurons - cytology; Neurons - physiology; Signal Transduction; Three-dimensional cell culture; Various methods and equipments; Three-dimensional cell culture; Laminin; Impedimetric biosensor; Neural differentiation; Electrical impedance spectroscopy; Collagen; Spectrometry; Three dimensional culture; Biosensor; Differentiation; Operating process; Electrical impedance
• ISSN: 0956-5663; 1873-4235
• DOI: 10.1016/j.bios.2010.07.066

The differentiation of neural cells is an important process during the development of the central nervous system. Studies on the mechanisms of the differentiation process is of special importance, e.g. in the field of regenerative medicine. In this contribution the cellular differentiation of gel matrix embedded neuronal cells was studied. The three-dimensional organization of neuronal cells represents a new cellular model system closer to the physiology than conventional two-dimensional cell cultures. Neuro2a (N2a) neuroblastoma cells were immobilized in different gel matrices and the grade of differentiation was compared. Furthermore, the impact of the cell number and selected differentiation factors were analyzed. Experimental results revealed that gel matrices based on collagen–laminin mixtures in contact with serum free medium enable neural differentiation. Therefore, collagen–laminin gels appear as a suitable three-dimensional model for drug screening in developmental neurobiology. Following optimization of the immobilization process, a novel impedimetric sensor and electrical impedance spectroscopy technique was applied to on-line monitor the differentiation process by means of changes in the dielectric and conductive properties. Experimental results showed an increase in the impedance magnitude that can be mainly attributed to differentiating cells accompanied by an increase in the specific resistivity of the bare gel mixture.