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SMIP004: a compound with antidepressant-like activities in mouse models.
European Journal of Pharmacology 2018 November 29
This study was designed to examine the potency of SMIP004, an inhibitor of S-phase kinase-associated protein 2 (Skp2), to exert antidepressant-like properties in mouse models following acute or chronic administration to C57BL6/J mice. To this end, the tail suspension test (TST), forced swim test (FST), and sucrose preference test (SPT) were utilized and the antidepressant-like activity of SMIP004 at different concentrations or time points in mice with or without chronic unpredictable stress (CUS) treatment were evaluated. Results showed that in the time- and dose-dependent experiment the antidepressant-like activity of SMIP004 in naïve mice occurred at day 11 and at the dosage of 2 and 4mg/kg. SMIP004 (2mg/kg) also produces antidepressant-like activities in naïve mice after three times in a 24-h administration scheme (24, 5, and 1h before the test) but not after acute treatment (1h before the test). Combined SMIP004-fluoxetine administration was found to induce coordinated antidepressant-like effects in naïve mice in the TST and FST. These results seem to be specific because the mice in different experimental groups showed no increased locomotor activity in the open field test. Further, long-term SMIP004 treatment at the dosage of 2 but not 1mg/kg reversed CUS-induced increase in immobility time in the TST and FST as well as CUS-induced decrease in sucrose preference in the SPT, suggesting that SMIP004 can produce antidepressant-like activities at stressed conditions. These results show that SMIP004 displays obvious antidepressant-like activities in all conducted tests, and suggest that SMIP004 might be a novel antidepressant.
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