Methamphetamine Treatment Affects Blood and Liver S-Adenosylmethionine (SAM) in Mice: Correlation with Dopamine Depletion in the Striatum(a)
Abstract
Methamphetamine (METH) is a major drug of abuse which causes neurotoxicity by depleting dopamine, its metabolites, high-affinity dopamine uptake sites and tyrosine hydroxylase activity in the striatum. Dopamine depletion and reduced dopamine transit are associated with depression. S-Adenosylmethionine (SAM) is the chief methyl donor used in dopamine and other neurotransmitter metabolism in mammals. Low SAM is associated with depression and other psychological and neurological disorders in humans. SAM is used to treat depression and some other neurological and psychiatric disorders. The present study was designed to determine if single or multiple doses of METH induce alterations in blood or liver SAM in mice and if these correlate with dopamine levels in the striatum. Adult male C57 mice were injected intraperitoneally with either single (1 × 40 mg/kg) or multiple (4 × 10 mg/kg) doses of METH. Animals were sacrificed at various intervals. A single injection of METH resulted in slightly higher blood SAM levels at 4 hr. Multiple doses of METH resulted in decreased hepatic and blood SAM levels at 72 hr. Blood SAM returned to control levels by 1 wk. Published work shows that dopamine levels increase hours after a single injection o...Continue Reading
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