Altered levels of extracellular signal-regulated kinase signaling proteins in postmortem frontal cortex of individuals with mood disorders and schizophrenia.

Journal of Affective Disorders
Peixiong YuanH K Manji

Abstract

The extracellular-regulated protein kinase (ERK) pathway has been implicated in processes such as neuronal plasticity and resilience in psychiatric disorders including major depressive disorder (MDD), bipolar disorder (BPD), and schizophrenia. The extent of the possible involvement of this pathway in psychiatric disorders remains unknown, as does its potential utility as a pharmacological target for the future development of novel therapeutics. Western blot analyses were used to measure levels of different proteins-Rap1, B-Raf, MEK1, MEK2, ERK1/2, RSK1, CREB, NSE, and beta-actin-in the postmortem frontal cortex of individuals with schizophrenia, MDD, and BPD, as well as healthy non-psychiatric controls. Levels of most studied protein members of the ERK cascade were lower in individuals with psychiatric disorders than controls; differences between psychiatric groups were not statistically significant. In general, protein levels were lower in individuals with schizophrenia than in those with BPD or MDD, but protein levels varied across groups. The small number of individuals in each diagnostic group may limit our interpretation of the results. Factors such as postmortem interval, medication status at time of death, and mood state...Continue Reading

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