Related Experiment Videos
Effects of methamphetamine on rat embryos cultured in vitro
Y Yamamoto1, K Yamamoto, H Abiru
1Department of Legal Medicine, Kyoto University Faculty of Medicine, Japan.
Abstract:
Wistar rat embryos were explanted on day 10.5 of gestation and exposed in vitro to methamphetamine (MAMP) at a concentration of 0.1, 0.2, 0.4, 0.6, or 0.8 mM for 24 h, and the direct teratogenic effects of the drug on rat embryos were examined. The viability of cultured embryos was not affected by the MAMP treatment. The yolk sac diameter was reduced at MAMP concentrations of 0.6 and 0.8 mM. The crown-rump length and the somite number of the embryos decreased significantly and dependently on the MAMP concentrations at 0.4-0.8 mM. The protein content was also significantly reduced at 0.4-0.8 mM. The developmental score was decreased in a concentration-dependent manner. The frequency of malformed embryos significantly increased at 0.6 and 0.8 mM. The malformations induced in treated embryos included microcephaly, neural tube defects, incomplete rotation of the body axis, and tortuous spinal cord. Abnormal histological changes such as derangement and necrosis in the neuroepithelial tissue were observed in embryos exposed to high concentration of the drug. Our results revealed the direct embryotoxic and teratogenic effects of MAMP in the rat.
Insights
Methamphetamine (MAMP) exposure directly harms developing Wistar rat embryos, causing developmental delays and malformations. High MAMP concentrations led to significant embryotoxicity and teratogenic effects, including neural tube defects.
Area of Science:
- Developmental toxicology
- Embryology
- Pharmacology
Background:
- Methamphetamine (MAMP) is a potent central nervous system stimulant with known risks.
- Understanding the direct impact of MAMP on embryonic development is crucial for assessing its teratogenic potential.
Purpose of the Study:
- To investigate the direct embryotoxic and teratogenic effects of methamphetamine (MAMP) on Wistar rat embryos in vitro.
- To determine the dose-dependent relationship between MAMP exposure and embryonic malformations.
Main Methods:
- Wistar rat embryos (day 10.5 gestation) were cultured in vitro.
- Embryos were exposed to varying concentrations of MAMP (0.1–0.8 mM) for 24 hours.
- Embryonic viability, yolk sac diameter, crown-rump length, somite number, protein content, developmental score, and malformation frequency were assessed.
Main Results:
- MAMP exposure did not affect embryo viability but reduced yolk sac diameter at higher concentrations (0.6–0.8 mM).
- Significant dose-dependent decreases in crown-rump length, somite number, and protein content were observed at MAMP concentrations of 0.4–0.8 mM.
- Malformation frequency increased significantly at 0.6–0.8 mM MAMP, with observed defects including microcephaly, neural tube defects, and abnormal spinal cord development.
Conclusions:
- Methamphetamine (MAMP) exhibits direct embryotoxic and teratogenic effects on developing Wistar rat embryos.
- MAMP exposure can lead to significant developmental abnormalities and histological damage in a dose-dependent manner.
- These findings highlight the potential risks of MAMP exposure during early gestation.