Time-course Study of High Fat Diet Induced Alterations in Spatial Memory, Hippocampal JNK, P38, ERK and Akt Activity

Overview

Journal Metab Brain Dis

Publisher Springer

Specialties Endocrinology
Neurology

Date 2018 Dec 16

PMID 30552557

Citations 8

Authors

Zahra Abbasnejad

Behzad Nasseri

Homeira Zardooz

Rasoul Ghasemi

Affiliations

Soon will be listed here.

Abstract

Consumption of high fat diet (HFD) is a health concern in modern societies, which participate in wide range of diseases. One underlying mechanism in the HFD mediated pathologies is disruption of insulin signaling activity. It is believed that HFD activates several stress signaling molecules such as MAPKs signaling pathway and these molecules participate in harmful effects in different cell populations including hippocampal cells. However, the activity of MAPKs signaling molecules are time dependent, even causing some opposing effects. Given that, MAPKs activity fluctuate with time of stress, there is less cleared how different lengths of HFD consumption can affect hippocampal MAPK. To test how duration of HFD consumption affect hippocampal MAPKs and insulin signaling activity and animal's cognitive function, rats were fed with HFD for different lengths (up to 6 months) and after each point spatial memory performances of animals was tested, then the peripheral indices of insulin resistance and hippocampal MAPKs and insulin signaling activity was evaluated. Results showed that while different time courses of HFD, up to 6 months, did not bring about significant spatial memory impairment, meanwhile the peripheral insulin sensitivity as well as hippocampal insulin and MAPKs signaling showed significant fluctuations during the different time courses of high fat diet regime. These results showed that neuronal responses to HFD is not constant and differ in a time-dependent manner, it seems that in acute phase molecular responses aimed to compensate the HFD stress but in chronic states these responses failed and devastating effects of stress began.

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