Total RNA was isolated from primary cells or human hippocampal tissue using Direct-zol RNA MicroPrep and Direct-zol RNA Miniprep respectively according to manufacturer’s protocol (Zymo Research Corp, CA, USA). Total RNA concentrations were determined using a spectrophotometer (NanoDrop Lite, ThermoScientific, CA, USA). Purity of samples was assessed with 2100 bioanalyzer (Agilent, CA, USA). cDNA was produced from 1000 ng RNA using NCODE Vilo cDNA synthesis kit (microRNAs) or SuperScript III First-Strand Synthesis kit (mRNAs) following manufacturer’s protocol (Life Technologies, CA, USA). SYBR green detection for RT-PCR detailed protocol described previously [14 (link),17 (link)]. The TargetScan prediction software was utilized to identify microRNAs that had conserved 8mer, 7mer or 6mer target sites on the 3’ UTR of SLCI1A2.