? PROJECT 1 Project 1 focuses on transcriptional and epigenetic mechanisms in the nucleus accumbens (NAc) and ventral tegmental area (VTA), key brain reward regions implicated in depression and other stress-related disorders. Over the past four years, we made significant progress in demonstrating the direct relevance of several modes of chromatin regulation to depression-related phenomena in VTA and NAc both in animal models and, with Project 4, in postmortem human brain. One of the primary rationales for focusing on chromatin mechanisms is their heuristic importance in mediating lifelong consequences of prior behavioral experience. Accordingly, with the Animal Models Core, we optimized a protocol where maternal separation (MS) during postnatal days P11- 20, but not other time windows, increases the susceptibility of male and female mice to subsequent stress in adulthood. This increase in stress susceptibility is latent: without subsequent stress the animals appear normal. This establishes an ideal system in which to study the chromatin mechanisms that mediate a lifelong increase in stress susceptibility, which we refer to colloquially as ?chromatin scars.? RNA-seq, with the Chromatin and Gene Analysis Core, revealed lasting gene expression abnormalities in VTA and NAc in MS-exposed mice before adult stress exposure. We focus here on two of the inferred top upstream regulators of these gene expression abnormalities, two transcription factors, OTX2 in dopamine neurons (DA) of VTA and ESR1 in D2- type medium spiny neurons (MSNs) of NAc. Indeed, we have found that both genes, upon their manipulation in the respective brain area and cell type, drive stress susceptibility. We are now characterizing the underlying mechanisms involved by defining chromatin changes that are induced at specific target genes in concert with alterations in OTX2 or ESR1 to control their lifelong expression in response to early life stress. We are also analyzing a small number of these target genes to understand how their lasting regulation controls the functioning of VTA DA neurons and D2 NAc MSNs to regulate stress susceptibility for a lifetime. Together, these studies are providing new insight into how early life stress controls stress susceptibility in males and females over the life cycle.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Specialized Center (P50)
Project #
5P50MH096890-10
Application #
10118214
Study Section
Special Emphasis Panel (ZMH1)
Project Start
2012-05-01
Project End
2022-02-28
Budget Start
2021-03-01
Budget End
2022-02-28
Support Year
10
Fiscal Year
2021
Total Cost
Indirect Cost
Name
Icahn School of Medicine at Mount Sinai
Department
Type
DUNS #
078861598
City
New York
State
NY
Country
United States
Zip Code
10029
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Aleyasin, Hossein; Flanigan, Meghan E; Golden, Sam A et al. (2018) Cell-Type-Specific Role of ?FosB in Nucleus Accumbens In Modulating Intermale Aggression. J Neurosci 38:5913-5924
Lorsch, Zachary S; Loh, Yong-Hwee Eddie; Purushothaman, Immanuel et al. (2018) Estrogen receptor ? drives pro-resilient transcription in mouse models of depression. Nat Commun 9:1116
Aleyasin, Hossein; Flanigan, Meghan E; Russo, Scott J (2018) Neurocircuitry of aggression and aggression seeking behavior: nose poking into brain circuitry controlling aggression. Curr Opin Neurobiol 49:184-191

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