PMID- 23462230 OWN - NLM STAT- MEDLINE DCOM- 20140123 LR - 20211021 IS - 1092-8529 (Print) IS - 1092-8529 (Linking) VI - 18 IP - 5 DP - 2013 Oct TI - Second messenger/signal transduction pathways in major mood disorders: moving from membrane to mechanism of action, part I: major depressive disorder. PG - 231-41 LID - 10.1017/S1092852913000059 [doi] AB - The etiopathogenesis and treatment of major mood disorders have historically focused on modulation of monoaminergic (serotonin, norepinephrine, dopamine) and amino acid [gamma-aminobutyric acid (GABA), glutamate] receptors at the plasma membrane. Although the activation and inhibition of these receptors acutely alter local neurotransmitter levels, their neuropsychiatric effects are not immediately observed. This time lag implicates intracellular neuroplasticity as primary in the mechanism of action of antidepressants and mood stabilizers. The modulation of intracellular second messenger/signal transduction cascades affects neurotrophic pathways that are both necessary and sufficient for monoaminergic and amino acid-based treatments. In this review, we will discuss the evidence in support of intracellular mediators in the pathophysiology and treatment of preclinical models of despair and major depressive disorder (MDD). More specifically, we will focus on the following pathways: cAMP/PKA/CREB, neurotrophin-mediated (MAPK and others), p11, Wnt/Fz/Dvl/GSK3beta, and NFkappaB/DeltaFosB. We will also discuss recent discoveries with rapidly acting antidepressants, which activate the mammalian target of rapamycin (mTOR) and release of inhibition on local translation via elongation factor stimulation. Throughout this discourse, we will highlight potential intracellular targets for therapeutic intervention. Finally, future clinical implications are discussed. FAU - Niciu, Mark J AU - Niciu MJ AD - 1 National Institutes of Health (NIH)/National Institute of Mental Health (NIMH), Experimental Therapeutics and Pathophysiology Branch (ETPB), Intramural Research Program, Bethesda, Maryland, USA. FAU - Ionescu, Dawn F AU - Ionescu DF FAU - Mathews, Daniel C AU - Mathews DC FAU - Richards, Erica M AU - Richards EM FAU - Zarate, Carlos A Jr AU - Zarate CA Jr LA - eng GR - Z99 MH999999/Intramural NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Intramural PT - Review DEP - 20130305 PL - United States TA - CNS Spectr JT - CNS spectrums JID - 9702877 SB - IM MH - Depressive Disorder, Major/*metabolism MH - Humans MH - Second Messenger Systems/*physiology MH - Signal Transduction/physiology PMC - PMC4955397 MID - NIHMS435405 EDAT- 2013/03/07 06:00 MHDA- 2014/01/24 06:00 PMCR- 2016/07/21 CRDT- 2013/03/07 06:00 PHST- 2013/03/07 06:00 [entrez] PHST- 2013/03/07 06:00 [pubmed] PHST- 2014/01/24 06:00 [medline] PHST- 2016/07/21 00:00 [pmc-release] AID - S1092852913000059 [pii] AID - 10.1017/S1092852913000059 [doi] PST - ppublish SO - CNS Spectr. 2013 Oct;18(5):231-41. doi: 10.1017/S1092852913000059. Epub 2013 Mar 5.