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Teratogenic effects of cadmium on Bufo arenarum during gastrulation
Abstract:
Developing Bufo arenarum embryos were treated during gastrulation with cadmium chloride in concentrations ranging from 6x10(-7) to 1.5x10(-5)M Cd++ at 20 and 30 degrees C. Initial failures at gastrulation result mainly in axial incurvations, microcephaly, hydropsy and abnormal tail formation. The higher temperature has a dual effect: at high concentrations of Cd early malformations are significantly increased; whereas, at low concentrations the higher temperature prevents alterations.
Insights
Cadmium chloride exposure during Bufo arenarum embryo gastrulation caused malformations. Higher temperatures exacerbated defects at high cadmium concentrations but prevented them at low concentrations.
Area of Science:
- Developmental toxicology
- Amphibian embryology
Background:
- Cadmium is a toxic heavy metal with known teratogenic effects.
- Embryonic development is sensitive to environmental stressors, including temperature and chemical exposure.
Purpose of the Study:
- To investigate the effects of cadmium chloride (CdCl2) on Bufo arenarum embryo development during gastrulation.
- To determine the influence of temperature on cadmium-induced developmental toxicity.
Main Methods:
- Bufo arenarum embryos were exposed to varying concentrations of cadmium chloride (6x10(-7) to 1.5x10(-5)M Cd++) during gastrulation.
- Embryo development was assessed at two different temperatures: 20°C and 30°C.
Main Results:
- Cadmium exposure led to gastrulation failures, resulting in axial incurvations, microcephaly, hydropsy, and abnormal tail formation.
- A higher temperature (30°C) significantly increased malformations at high cadmium concentrations.
- Conversely, the higher temperature mitigated cadmium-induced alterations at low concentrations.
Conclusions:
- Temperature modulates cadmium toxicity during early amphibian development.
- These findings highlight the complex interplay between chemical exposure and environmental factors in developmental processes.