Contrary to conferring cardioprotection in male animals, acute ethanol causes estrogen (E2)-dependent myocardial depression in females. Despite progress made during the previous award, the molecular mechanisms for this health related problem remain unresolved. We hypothesize that E2-mediated accumulation of ethanol-derived acetaldehyde (ACA) creates environment conducive to paradoxical transformation of E2 into a pro-inflammatory hormone. We will focus on myocardial catalase and mitochondrial aldehyde dehydrogenase 2 (mit-ALDH2) because E2 enhancement of their physiological activity confers cardioprotection and both enzymes regulate myocardial ethanol-derived ACA balance;catalase catalyzes ethanol oxidation to ACA and mit-ALDH2 detoxifies ACA. We hypothesize that E2 enhancement of myocardial catalase activity could result in higher ethanol-derived ACA. Subsequently, competition of higher ACA level with more cytotoxic substrates for mit-ALDH2 leads to accumulation of cytotoxic aldehydes (oxidative stress and myocardial dysfunction). We further hypothesize that E2 mediates these cellular effects via nongenomic estrogen receptor (ER) signaling. To test our novel hypotheses, we will employ a multidisciplinary approach that encompasses integrative, cellular, molecular and pharmacological studies to address the following specific aims.
Aim 1 studies will test the hypothesis that enhancement of nongenomic rapid ER signaling mediates ethanol-evoked oxidative stress and myocardial depression in female rats.
Aim 2 studies will elucidate the role of ACA generating (ADH, catalase) and aldehyde detoxifying (mit-ALDH2) enzymes in the E2-dependent oxidative stress and myocardial depression caused by ethanol.
Aim 3 studies will test the novel hypothesis that ethanol/ACA- evoked eNOS/nNOS uncoupling plays pivotal role in the paradoxical transformation of E2 into proinflammatory hormone in the myocardium and vasculature. These studies will further our understanding of the molecular mechanisms for the E2-dependent myocardial dysfunction caused by acute alcohol and will allow identification of novel targets for new interventions for the treatment/prevention of cardiovascular anomalies caused by alcohol in females.

Public Health Relevance

Given the steady rise in acute alcohol consumption by young women, the proposed research is clinically relevant because it: (i) elucidates how estrogen transforms ethanol-evoked cardio-protection into cardiodepression in females;(ii) identifies alcohol use as potential contributor to the disappointing outcomes with estrogen in clinical studies;(iii) identifies the estrogen receptor subtype(s) implicated in the higher physiological activity of the cardioprotective enzyme, myocardial mit-ALDH2 in females.

Agency
National Institute of Health (NIH)
Institute
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
Type
Research Project (R01)
Project #
5R01AA014441-08
Application #
8494461
Study Section
Neurotoxicology and Alcohol Study Section (NAL)
Program Officer
Orosz, Andras
Project Start
2003-08-01
Project End
2016-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
8
Fiscal Year
2013
Total Cost
$314,450
Indirect Cost
$95,321
Name
East Carolina University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
607579018
City
Greenville
State
NC
Country
United States
Zip Code
27858
Yao, Fanrong; Abdel-Rahman, Abdel A (2017) Estrogen Receptors ? and ? Play Major Roles in Ethanol-Evoked Myocardial Oxidative Stress and Dysfunction in Conscious Ovariectomized Rats. Alcohol Clin Exp Res 41:279-290
Matouk, Asmaa I; Taye, Ashraf; El-Moselhy, Mohamed A et al. (2017) The Effect of Chronic Activation of the Novel Endocannabinoid Receptor GPR18 on Myocardial Function and Blood Pressure in Conscious Rats. J Cardiovasc Pharmacol 69:23-33
Steagall, Rebecca J; Yao, Fanrong; Shaikh, Saame Raza et al. (2017) Estrogen receptor ? activation enhances its cell surface localization and improves myocardial redox status in ovariectomized rats. Life Sci 182:41-49
Yao, Fanrong; Abdel-Rahman, Abdel A (2017) Combined Catalase and ADH Inhibition Ameliorates Ethanol-Induced Myocardial Dysfunction Despite Causing Oxidative Stress in Conscious Female Rats. Alcohol Clin Exp Res 41:1541-1550
Abdel-Rahman, Abdel A (2017) Influence of sex on cardiovascular drug responses: role of estrogen. Curr Opin Pharmacol 33:1-5
Fouda, Mohamed A; Abdel-Rahman, Abdel A (2017) Endothelin Confers Protection against High Glucose-Induced Neurotoxicity via Alleviation of Oxidative Stress. J Pharmacol Exp Ther 361:130-139
El-Sayed, Shaimaa S; Zakaria, Mohamed N M; Abdel-Ghany, Rasha H et al. (2016) Cystathionine-? lyase-derived hydrogen sulfide mediates the cardiovascular protective effects of moxonidine in diabetic rats. Eur J Pharmacol 783:73-84
Yao, Fanrong; Abdel-Rahman, Abdel A (2016) Estrogen receptor ER? plays a major role in ethanol-evoked myocardial oxidative stress and dysfunction in conscious female rats. Alcohol 50:27-35
Ibrahim, Badr Mostafa; Abdel-Rahman, Abdel A (2015) A pivotal role for enhanced brainstem Orexin receptor 1 signaling in the central cannabinoid receptor 1-mediated pressor response in conscious rats. Brain Res 1622:51-63
El-Mas, Mahmoud M; Abdel-Rahman, Abdel A (2015) Estrogen modulation of the ethanol-evoked myocardial oxidative stress and dysfunction via DAPK3/Akt/ERK activation in male rats. Toxicol Appl Pharmacol 287:284-92

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