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Alcohol alters rat adrenomedullary function and stress response
Patricia Patterson-Buckendahl1, Gregory Blakley, Lucia Kubovcakova
1Center of Alcohol Studies, Rutgers University, 607 Allison Road, Piscataway, NJ 08854, USA. buckendp@rci.rutgers.edu
Annals of the New York Academy of Sciences
|July 9, 2004
Summary
Chronic alcohol consumption, even at lower doses, significantly increases adrenal catecholamine synthesis enzymes in rats. This adaptation may enhance physiological stress responses and potentially influence aggressive behavior.
Area of Science:
- Neuroscience
- Endocrinology
- Pharmacology
Background:
- The impact of alcohol intoxication on the sympatho-adrenomedullary system's response to stress is understudied.
- Previous research indicated that high ethanol (EtOH) intake elevates adrenal catecholamine synthesis enzyme gene expression, further increased by acute stress.
Purpose of the Study:
- To investigate if chronic exposure to lower concentrations of ethanol alters the sympatho-adrenomedullary system response to mild stressors.
- To examine the effects of different durations and concentrations of alcohol consumption on adrenal catecholamine synthesis enzyme gene expression.
Main Methods:
- Rats were administered 10% EtOH for 4 weeks or 6% EtOH for 7 weeks, with or without wire mesh restraint (WMR).
- Gene expression of key catecholamine synthesizing enzymes (tyrosine hydroxylase, dopamine beta-hydroxylase, phenylethanolamine-N-methyl transferase) in the adrenal glands was measured.
- Control groups included ad libitum and pair-fed rats.
Main Results:
- Alcohol consumption significantly increased tyrosine hydroxylase gene expression (80-90%) in both experiments.
- 6% EtOH consumption increased dopamine beta-hydroxylase and phenylethanolamine-N-methyl transferase gene expression, while 10% EtOH did not.
- Wire mesh restraint decreased the alcohol-induced elevation of all three enzyme gene expressions.
Conclusions:
- Chronic alcohol consumption upregulates adrenal catecholamine synthesis, potentially enhancing physiological stress responses.
- This adaptation may have implications for survival during stress and could contribute to behavioral changes like aggression.