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Summary
Oral laetrile caused skeletal malformations in hamster offspring due to cyanide release. Intravenous laetrile did not cause these effects, and thiosulfate protected against oral laetrile toxicity.
Area of Science:
- Toxicology
- Developmental Biology
- Pharmacology
Background:
- Laetrile, a compound found in apricot kernels, has been investigated for potential health benefits.
- Concerns exist regarding the safety of Laetrile, particularly during pregnancy.
- The metabolic fate and teratogenic potential of Laetrile require further elucidation.
Purpose of the Study:
- To investigate the teratogenic effects of orally and intravenously administered Laetrile in pregnant hamsters.
- To determine the role of cyanide in Laetrile-induced embryopathy.
- To assess the protective effects of thiosulfate against Laetrile toxicity.
Main Methods:
- Pregnant hamsters were administered Laetrile orally or intravenously.
- Offspring skeletal development was examined for malformations.
- In situ cyanide concentrations were measured in maternal and embryonic tissues.
- Thiosulfate was administered to assess its protective role.
Main Results:
- Oral Laetrile administration resulted in significant skeletal malformations in offspring.
- Intravenous Laetrile administration did not produce embryopathic effects.
- Oral Laetrile significantly increased in situ cyanide concentrations.
- Thiosulfate administration protected embryos from the teratogenic effects of oral Laetrile.
Conclusions:
- The teratogenic effects of oral Laetrile are likely mediated by cyanide released via bacterial beta-glucosidase activity.
- Intravenous administration bypasses this metabolic pathway, thus avoiding teratogenicity.
- These findings highlight the importance of metabolic activation in Laetrile's toxicity and suggest a mechanism for its teratogenic potential.