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The serotonin 5-HT 2A  receptor (5-HT 2A R) has been receiving increasing attention because its genetic variants have been associated with a variety of neurological diseases. To elucidate the pathogenesis of the neurological diseases associated with 5-HT 2A R gene ( HTR2A ) variants, we have previously established a protocol to induce  HTR2A -expressing neurons from human-induced pluripotent stem cells (hiPSCs). Here, we investigated the maturation stages and electrophysiological properties of  HTR2A -positive neurons induced from hiPSCs and constructed an  HTR2A  promoter-specific reporter lentivirus to label the neurons. We found that neuronal maturity increased over time and that  HTR2A  expression was induced at the late stage of neuronal maturation. Furthermore, we demonstrated successful labelling of the  HTR2A -positive neurons, which had fluorescence and generated repetitive action potentials in response to depolarizing currents and an inward current during the application of TCB-2, a selective agonist of 5-HT 2A Rs, respectively. These results indicated that our in vitro model mimicked the in vivo dynamics of 5-HT 2A R. Therefore, in vitro monitoring of the function of  HTR2A -positive neurons induced from hiPSCs could help elucidate the pathophysiological mechanisms of neurological diseases associated with genetic variations of the  HTR2A  gene.

In vitro monitoring of HTR2A-positive neurons derived from human-induced pluripotent stem cells