Exploring hyperglycemia's impact on embryonic development: Insights from the chicken embryo model

Area of Science:

• Developmental Biology
• Teratology
• Endocrinology

Background:

• Pregnancy hyperglycemia is linked to congenital anomalies.
• Existing rodent models have limitations in controlling the embryonic environment.
• A need exists for alternative models to study hyperglycemia's developmental effects.

Purpose of the Study:

• To evaluate the chicken embryo (Gallus gallus) as a model for studying hyperglycemia's impact on early embryonic development.
• To assess developmental outcomes and molecular alterations in chicken embryos exposed to hyperglycemia.
• To investigate potential molecular mechanisms underlying hyperglycemia-induced teratogenicity.

Main Methods:

• Fertilized chicken eggs were exposed to glucose (0.2 and 0.4 mmol) from embryonic day 1 (E1).
• Glucose levels, mortality, and morphological abnormalities were assessed on embryonic day 5 (E5).
• Molecular analyses included gene expression (igf2, glut1) and enzyme activity (Superoxide Dismutase).

Main Results:

• Hyperglycemia significantly increased glucose levels in the embryo's environment and bloodstream.
• High glucose induced developmental toxicity, including increased mortality and defects in optic organs, brain, heart, and neural tube.
• Molecular changes observed: increased igf2, decreased glut1 expression, and reduced Superoxide Dismutase activity, suggesting oxidative stress.

Conclusions:

• The chicken embryo model is suitable for researching hyperglycemia's effects on embryonic development.
• This model provides insights into molecular mechanisms, such as potential protective responses and oxidative stress.
• The chicken embryo serves as a valuable tool for future teratogenic research related to hyperglycemia.