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Teratogenic effects of benzo[a]pyrene in developing chick embryo
1Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Lucknow, India.
Insights
Benzo[a]pyrene (BP), a carcinogen, causes developmental defects in chick embryos. Exposure via yolk sac injection resulted in growth retardation and birth defects, indicating BP is a teratogen.
Area of Science:
- Developmental toxicology
- Embryology
- Environmental health
Background:
- Benzo[a]pyrene (BP) is a known carcinogen found in environmental pollutants.
- Understanding its impact on embryonic development is crucial for public health.
- Chick embryos offer a viable model for studying teratogenic effects.
Purpose of the Study:
- To investigate the teratogenic effects of benzo[a]pyrene (BP) on developing chick embryos.
- To determine the impact of BP exposure at different developmental stages.
- To explore potential mechanisms underlying BP-induced developmental abnormalities.
Main Methods:
- Developing chick embryos were exposed to varying doses of BP.
- Administration of BP was performed via the yolk sac route.
- Embryonic growth parameters (body weight, crown-rump length, bill length) were measured.
- Teratogenic effects in survivors were documented.
Main Results:
- BP exposure led to significant growth retardation in chick embryos.
- Abnormalities observed included twisted legs, shortened bones, abdominal edema, and short necks.
- BP demonstrated teratogenic effects when administered via yolk sac injection.
- The 'edema syndrome' was identified as a potential mechanism for BP-induced teratogenicity.
Conclusions:
- Benzo[a]pyrene acts as a teratogen in developing chick embryos.
- Yolk sac administration is an effective route for inducing BP-related developmental toxicity.
- The 'edema syndrome' may play a significant role in the teratogenic outcomes observed.
Abstract:
The effect of benzo[a]pyrene (BP), an established carcinogen, on developing chick embryos was investigated. The embryos were exposed in different stages of development to various doses of BP via the yolk sac route. This resulted in retarded growth, as reflected by lower embryonic body weight, reduced crown-rump length and bill length. Abnormal survivors showed remarkably twisted legs with shortening of the bones, abdominal oedema, haematomas, blisters and a short neck. These findings suggest that BP is a teratogen when injected via this route, and the 'oedema syndrome' is a possible mechanism causing teratogenic effects in developing chick embryos when treated with BP.