Chick development and high dose of bendiocarb

Area of Science:

• Toxicology
• Developmental Biology
• Neuroscience

Background:

• Carbamate pesticides generally exhibit low vertebrate toxicity, but developmental toxicity data are limited.
• Bendiocarb is a carbamate pesticide requiring further toxicological assessment.

Purpose of the Study:

• To investigate the potential toxicity of bendiocarb on the liver and central nervous system of developing chick embryos.
• To evaluate the impact of bendiocarb exposure on cellular apoptosis and organ integrity during embryonic development.

Main Methods:

• Bendiocarb was administered to chick embryos on embryonic days 3 and 10 via membrana papyracea.
• Macroscopic and microscopic examinations of liver and central nervous system were performed.
• Caspase activity was assessed using immunopositivity staining to detect apoptosis.

Main Results:

• A high rate of embryolethality (94%) was observed following bendiocarb administration on embryonic day 3.
• No macroscopic or microscopic changes were detected in the liver or central nervous system of survived chick embryos.
• Bendiocarb exposure did not result in increased caspase immunopositivity, indicating no significant induction of apoptosis in the surviving embryos.

Conclusions:

• Despite high embryolethality, bendiocarb did not induce observable toxicity in the liver or central nervous system of surviving chick embryos.
• The study suggests that surviving chick embryos may tolerate bendiocarb exposure without significant organ-specific damage or increased apoptosis.
• Further investigation is needed to understand the mechanisms behind the high embryolethality and the lack of apparent organ toxicity in survivors.