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Researchers begin to decipher metabolism of sexual assault drug
Date:11/19/2009

It's a naturally occurring brain chemical with an unwieldy name: 4-hydroxybutyrate (4-HB). Taken by mouth, it can be abused or used as a date-rape drug.

Now, a team of Ohio and Michigan scientists have determined new routes by which 4-HB is metabolized by the body. "This is new and important information," said K. Michael Gibson, professor and chair of biological sciences at Michigan Technological University and a member of the research team. "It may provide new clues on how to counteract the drug's effects, or to enhance its metabolism and decrease toxicity for chronic abusers or victims of sexual assault."

Gibson is co-author with Guo-Fang Zhang and others in the laboratory of Prof. Henri Brunengraber from the Department of Nutrition at Case Western Reserve University School of Medicine of a paper published online today by the Journal of Biological Chemistry. Their findings will appear in as "paper of the week" in the the print edition of the weekly journal on Nov. 27, 2009.

4-HB is a derivative of a major brain neurotransmitter in humans and other species. . It occurs naturally in small amounts in the brains of most animals and humans. In a rare genetic metabolic disorder, 4-HB accumulates in extremely high levels, causing significant developmental delays and seizures.

But 4-HBalso called gamma hydroxybutyrate or GHBis best known and most feared when it is taken orally, because it is a drug that impairs the capacity to exercise judgment, like rohypnol and ketamine hydrochloride.. For that reason, it can be used to facilitate acquaintance sexual assault, commonly called date rape.

Analyzing the chemicals produced by the breakdown of 4-HB in mice and rats, Zhang, Gibson and colleagues used very sophisticated mass spectrometry approaches to identify previously unknown enzymes and pathways that appear to act on 4-HB and other similarly structured compounds. They discovered that 4-HB is metabolized by t
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Contact: Jennifer Donovan
jdonovan@mtu.edu
906-487-4521
Michigan Technological University
Source:Eurekalert  

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