Schizophrenia is a group of severe mental disorders. Icariin is a main active component of Epimedium, possessing therapeutic effects on various neurodegenerative diseases. The present study investigated whether icariin is effective in alleviating schizophrenia-like symptoms and explored its underlying molecular mechanism. A developmental schizophrenia rat model employing 2-week repeated MK-801 administration was established. Icariin was orally administrated 3 time per day for 2 weeks after the MK-801 administration. Open-field test (OFT), novel object recognition (NOR), rotarod, and Morris water maze (MWM) were performed to examine the therapeutic effects of icariin on behavioural abnormalities. Hematoxylin-eosin (HE) staining on hippocampus slices, and MTT assay and Calcein/PI staining on the SK-N-SH cells treated with MK-801 were carried out to assess the neuroprotective effects of icariin. Furthermore, the regulation of icariin on the miR-144-3p/ATP1B2/mTOR signalling pathway was examined by RT-PCR and Western blots. The results showed that icariin alleviated MK-801-induced anxiety and recognition memory deficits in the OFT and NOR, respectively. Additionally, weakened motor coordination caused by MK-801 was restored by icariin. The MWM test also showed that icariin can improve MK-801-induced impaired spatial memory and swimming ability. Furthermore, brain grey matter atrophy, cytotoxicity, and cell apoptosis caused by MK-801 can be eliminated by icariin. Lastly, icariin can regulate the expression of miR-144-3p and ATP1B2, and enhance the phosphorylation of PI3K, Akt, and mTOR. In conclusion, this study revealed that icariin may have therapeutic effects on schizophrenia-like disorders via regulating the miR-144-3p/ATP1B2/mTOR signalling, suggesting that icariin has potential to become an antipsychotic drug.
Keywords: Icariin; MK-801; Risperidone; Schizophrenia; miR-144-3p/ATP1B2/mTOR signalling pathway.
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