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Dynamic changes in prefrontal cortex gene expression following lysergic acid diethylamide administration
Charles D Nichols1, Efrain E Garcia, Elaine Sanders-Bush
1Department of Pharmacology, Vanderbilt University School of Medicine, 8148 Medical Research Building Three, Nashville, TN 37232-8548, USA. charles.nichols@vanderbilt.edu
Brain Research. Molecular Brain Research
|March 26, 2003
Summary
Lysergic acid diethylamide (LSD) alters gene expression in the rat prefrontal cortex, primarily through the 5-HT2A receptor. This research offers insights into LSD
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Lysergic acid diethylamide (LSD) is a potent psychoactive substance known to induce transient alterations in perception, mood, and behavior.
- LSD-induced behavioral changes share similarities with symptoms observed in mental disorders like schizophrenia.
- Understanding LSD's molecular mechanisms, particularly gene expression changes, is crucial for insights into both drug effects and psychiatric conditions.
Purpose of the Study:
- To comprehensively analyze the dynamic gene expression profiles in the rat prefrontal cortex following LSD administration.
- To investigate the dose-dependent effects of LSD on the expression of specific genes.
- To elucidate the roles of serotonin receptors 5-HT(1A) and 5-HT(2A) in mediating LSD-induced gene expression.
Main Methods:
- RNase protection analysis was employed to quantify the expression levels of identified LSD-responsive genes in rat prefrontal cortex.
- Dose-response experiments were conducted to characterize the relationship between LSD dosage and gene expression.
- Pharmacological studies using receptor-specific antagonists for 5-HT(1A) and 5-HT(2A) were performed to determine receptor involvement.
Main Results:
- Gene expression responses to LSD were found to be dynamic, with some genes showing rapid induction and decay, while others exhibited slower changes.
- Two distinct classes of gene expression responses were observed based on dosage: maximal stimulation at lower doses versus continued increase at higher doses.
- The majority of LSD-induced gene expression increases were mediated by the 5-HT(2A) receptor, although two genes' expression was not dependent on either 5-HT(1A) or 5-HT(2A) receptors.
Conclusions:
- LSD induces complex and dynamic changes in gene expression within the rat prefrontal cortex.
- The 5-HT(2A) receptor plays a significant role in mediating the majority of LSD's effects on gene expression.
- These findings contribute to understanding the molecular underpinnings of LSD's psychoactive effects and may offer insights into schizophrenia.