Abstract
Background High-fat diets (HFDs) adversely influence glutamate metabolism and neurotransmission. The precise role of the group II metabotropic glutamate receptors (mGluR2/3) antagonist on spatial memory deficit following consumption of HFD has not yet been clarified. Therefore, in this study, we examined the effects of post-training administration of mGluR2/3 antagonism; LY341495 on spatial memory in rats fed with HFD by using Morris Water Maze (MWM) task. Intraperitoneal injection (i.p) injection of LY341495 was done 30 minutes before retention test. Results Our results showed that HFD did not have any effect on memory acquisition. There were not significant differences in escape latency and swimming distance between experimental groups (P>0.05, Two-way ANOVA). Our finding showed that consumption of an HFD leads to spatial memory impairment. There were significant differences in time spent in target zone between experimental groups [F (3, 20) = 7.031, P=0.0021, one-way ANOVA]. Also, LY341495 improved HFD-induced reference memory impairment. HFD animals treated with LY341495 spent more time in the target zone in compare with HFD animals (P= 0.0449). Conclusions Our results suggested that prolonged consumption of high-fat diet has no effects on the acquisition of spatial learning, but can impair memory retention of the adult male rats and post-training administration of LY341495 can improve HFD-induced reference memory impairment.
Environmental enrichment ameliorated high-fat diet-induced Aβ deposition and memory deficit in APP transgenic mice