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Regional localization of methaqualone in rat brain
Research Communications in Chemical Pathology and Pharmacology
|December 1, 1978
Summary
Methaqualone (MTQ) distributes throughout rat brain regions, with the highest concentration found in the pineal gland. Significant MTQ levels persist in the brain for at least 3 hours post-administration.
Area of Science:
- Pharmacology
- Neuroscience
- Drug Metabolism
Background:
- Methaqualone is a sedative-hypnotic drug with known central nervous system effects.
- Understanding its distribution in the brain is crucial for comprehending its pharmacological actions and potential toxicity.
Purpose of the Study:
- To investigate the distribution pattern of orally administered methaqualone-14C in various rat brain regions.
- To determine the time course of methaqualone concentration in the brain.
Main Methods:
- Rats were administered methaqualone-14C orally at a dose of 25 mg/kg.
- Brain tissue samples from different regions were collected at specific time points.
- Radioactivity, representing methaqualone concentration, was measured using liquid scintillation counting.
Main Results:
- Peak methaqualone concentration in rat brain areas was achieved at 1.5 hours post-administration.
- The highest concentration was observed in the pineal gland (8.2 microgram/g).
- Methaqualone levels in other brain regions, including the cortex, pituitary, hypothalamus, hippocampus, mid-brain, medulla-pons, striatum, and cerebellum, ranged from 2 to 3.5 microgram/g.
- Significant methaqualone concentrations were still detectable in all examined brain regions at 3 hours.
Conclusions:
- Methaqualone exhibits relatively uniform distribution across various rat brain regions due to its lipophilic nature.
- The drug's presence in the brain persists for several hours, suggesting sustained central nervous system exposure.