Pharmacological Responses in Cultured Human iPSC-Derived Cortical Neurons Using Multi-Electrode Array
Poster Apr 05, 2016
Aoi Odawara (1,2), Hiroki Katoh (1), Naoki Matsuda (1), Karolina Szczesna (3), Yichen Shi (3), Ryan Arant (4), Hideyasu Jiko (4), Ikuro Suzuki (1)
Human induced pluripotent stem cell (hiPSC)-derived neurons may be used effectively for drug discovery and cell-based therapy. However, this is limited by the immaturity of cultured hiPSC-derived neurons and the lack of established functional evaluation methods. We used a multi-electrode array (MEA) system to investigate the effects of co-culturing astrocytes with hiPSC-derived cortical neurons on long-term culture, spontaneous firing activity, and drug responsiveness. The co-culture facilitated long-term culture of hiPSC-derived neurons over 400 days. Long-term spontaneous firing activity was also observed. After >3 months in culture, we observed synchronous burst firing activity due to synapse transmission within neuronal networks. Compared with rat neurons, hiPSC-derived neurons required a longer time to mature functionally. In drug response studies, addition of the synapse antagonist bicuculline, CNQX and AP5, and the agonist, L-glutamate, a kainic acid, induced significant changes in the firing rate and synchronised burst firing patterns. Furthermore, administration of pentylentetrazole (PTZ) induced epileptiform activity. Anti-epilepsy drugs, phenytoin and sodium valproate, reduced epileptiform activity. These results suggest that long-term electrophysiological measurements in hiPSC-derived neurons using an MEA system may be beneficial for clarifying the functions of human neuronal circuits and drug screening applications.
Spinal muscular atrophy (SMA) is an inheritable cause of infant mortality that is characterized by the loss of lower motor neurons and skeletal muscle atrophy. The degeneration of motor neurons is caused by insufficient levels of survival motor neuron (SMN) protein, which is encoded by two nearly identical genes SMN1 and SMN2. Most cases of SMA harbour homozygous deletions of the SMN1 gene and retain at least one copy of SMN2.READ MORE