S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Journal Papers (저널논문_전기·정보공학부)
Low-density neuronal networks cultured using patterned poly-l-lysine on microelectrode arrays
- Jun, Sang Beom; Hynd, Matthew R.; Dowell-Mesfin, Natalie; Smith, Karen L.; Turner, James N.; Shain, William; Kim, Sung June
- Issue Date
- J Neurosci Meth 2007;160:317-26
- Synaptic activity recorded from low-density networks of cultured rat hippocampal neurons was monitored using microelectrode arrays (MEAs).
Neuronal networks were patterned with poly-l-lysine (PLL) using microcontact printing ( CP). Polydimethysiloxane (PDMS) stamps were
fabricated with relief structures resulting in patterns of 2 m-wide lines for directing process growth and 20 m-diameter circles for cell soma
attachment. These circles were aligned to electrode sites. Different densities of neurons were plated in order to assess the minimal neuron density
required for development of an active network. Spontaneous activity was observed at 10–14 days in networks using neuron densities as low as
200 cells/mm2. Immunocytochemistry demonstrated the distribution of dendrites along the lines and the location of foci of the presynaptic protein,
synaptophysin, on neuron somas and dendrites. Scanning electron microscopy demonstrated that single fluorescent tracks contained multiple
processes. Evoked responses of selected portions of the networks were produced by stimulation of specific electrode sites. In addition, the neuronal
excitability of the network was increased by the bath application of high K+ (10–12 mM). Application of DNQX, an AMPA antagonist, blocked
all spontaneous activity, suggesting that the activity is excitatory and mediated through glutamate receptors.
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