Alcohol use disorders, generally known as alcoholism, have taken emotional and financial tolls on American society, cutting across ages, races, ethnicities, and genders, with over 17 million Americans meeting the diagnostic criteria for alcohol abuse or dependence. Clinical data demonstrate alterations in brain structure and function in chronic alcoholics, injuries that may promote the individual s decline to meeting diagnostic criteria for alcohol dependence. Alcohol dependence is characterized by cycles of repeated high alcohol intake and negative emotional consequences of withdrawal that contribute to excessive drinking and susceptibility to relapse. There is a high likelihood that alcohol-dependent individuals will relapse to drinking even after long periods of abstinence, making treatment options challenging. One promising approach for the treatment of relapse to drinking is the identification of mechanisms that contribute to alcohol-induced reductions in brain mass and neurodegeneration. Recent evidence demonstrates that alcohol-induced neurodegeneration is affected by the decreased production of neural and glial progenitors in the adult brain. In the proposed studies, our research will specifically focus on alcohol s effects on the birth and survival of progenitors (glial stem cells and gliogenesis) in the medial prefrontal cortex (mPFC), a brain region implicated in the acute reinforcing effects of alcohol and relapse to alcohol-seeking behavior. Preliminary evidence from our laboratory demonstrated that excessive drinking in a rodent model of alcohol vapor-induced dependence decreased the proliferation and survival of adult-generated mPFC progenitors. Such regulation was not observed in nondependent alcohol self-administering rats, suggesting that the mPFC gliogenic niche is more vulnerable to dysregulation of the homeostatic system during dependence. These results raise a number of fundamental questions about the neuroplastic changes that contribute to alcohol dependence and the neuroplastic mechanisms that underlie the relapse stage of alcoholism. Therefore, this proposal will identify whether reduced gliogenesis in the mPFC could be a vulnerability factor for alcohol dependence and relapse. Animal models of excessive drinking during vapor-induced alcohol dependence and nondependent drinking will be used to (1) determine the cellular mechanisms underlying reduced mPFC plasticity during alcohol dependence (Specific Aim 1), (2) determine impairments in memory and cognitive function dependent on the mPFC during alcohol dependence (Specific Aim 2), and (3) demonstrate a causal relationship between newly born glial progenitors and relapse to alcohol seeking (Specific Aim 3). Immunohistochemical, biochemical, neuroanatomical, and behavioral measures will be used to determine the functional relationships between neocortical gliogenesis and alcohol dependence. The proposed aims will reveal new vulnerability markers for alcohol dependence and impart significant information about targets for medication development.

Public Health Relevance

In the past decade, about 17 million Americans met the diagnostic criteria for alcoholism, cutting across age, race, ethnicity and gender, and eventual dependence to alcohol has increased mortality, morbidity, and economic costs. Psychopathology of the medial prefrontal cortex has been implicated in such dependence-like syndromes. In this proposal, using a well established rodent model of alcohol dependence we will begin to identify the cellular mechanisms underlying dependence-induced decreases in medial prefrontal cortical plasticity, and determine a causal role for the newly generated prefrontocortical glia in alcohol use disorders.

Agency
National Institute of Health (NIH)
Institute
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
Type
Research Project (R01)
Project #
1R01AA020098-01A1
Application #
8237688
Study Section
Neurotoxicology and Alcohol Study Section (NAL)
Program Officer
Regunathan, Soundar
Project Start
2012-09-25
Project End
2017-08-31
Budget Start
2012-09-25
Budget End
2013-08-31
Support Year
1
Fiscal Year
2012
Total Cost
$303,442
Indirect Cost
$128,442
Name
Scripps Research Institute
Department
Type
DUNS #
781613492
City
La Jolla
State
CA
Country
United States
Zip Code
92037
Mandyam, Chitra D; Somkuwar, Sucharita S; Oliver, Robert J et al. (2018) New Neurons in the Dentate Gyrus Promote Reinstatement of Methamphetamine Seeking. J Exp Neurosci 12:1179069518779625
Dutta, Rahul R; Taffe, Michael A; Mandyam, Chitra D (2018) Chronic administration of amphetamines disturbs development of neural progenitor cells in young adult nonhuman primates. Prog Neuropsychopharmacol Biol Psychiatry 85:46-53
Takashima, Yoshio; Mandyam, Chitra D (2018) The role of hippocampal adult neurogenesis in methamphetamine addiction. Brain Plast 3:157-168
Takashima, Yoshio; Fannon, McKenzie J; Galinato, Melissa H et al. (2018) Neuroadaptations in the dentate gyrus following contextual cued reinstatement of methamphetamine seeking. Brain Struct Funct 223:2197-2211
Galinato, Melissa H; Takashima, Yoshio; Fannon, McKenzie J et al. (2018) Neurogenesis during Abstinence Is Necessary for Context-Driven Methamphetamine-Related Memory. J Neurosci 38:2029-2042
Galinato, M H; Lockner, J W; Fannon-Pavlich, M J et al. (2018) A synthetic small-molecule Isoxazole-9 protects against methamphetamine relapse. Mol Psychiatry 23:629-638
Fannon, McKenzie J; Mysore, Karthik K; Williams, Jefferson et al. (2018) Hippocampal neural progenitor cells play a distinct role in fear memory retrieval in male and female CIE rats. Neuropharmacology 143:239-249
Staples, Miranda C; Fannon, McKenzie J; Mysore, Karthik K et al. (2017) Dietary restriction reduces hippocampal neurogenesis and granule cell neuron density without affecting the density of mossy fibers. Brain Res 1663:59-65
Somkuwar, Sucharita S; Vendruscolo, Leandro F; Fannon, McKenzie J et al. (2017) Abstinence from prolonged ethanol exposure affects plasma corticosterone, glucocorticoid receptor signaling and stress-related behaviors. Psychoneuroendocrinology 84:17-31
Somkuwar, Sucharita S; Fannon, McKenzie J; Bao Nguyen, Tran et al. (2017) Hyper-oligodendrogenesis at the vascular niche and reduced blood-brain barrier integrity in the prefrontal cortex during protracted abstinence. Neuroscience 362:265-271

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