Diabetes and Early Development: Epigenetics, Biological Stress, and Aging

Area of Science:

• Developmental biology and toxicology
• Understanding the molecular mechanisms of birth defects

Background:

• Pregestational diabetes (type 1 and type 2) is a significant risk factor for structural birth defects, including neural tube and congenital heart defects.
• Rodent models accurately replicate human diabetic embryopathy, highlighting hyperglycemia's role in triggering cellular stress pathways.

Purpose of the Study:

• To review the causal events in diabetic embryopathy.
• To propose preventative strategies for maternal diabetes-induced structural birth defects.

Main Methods:

• Review of existing literature on diabetic embryopathy mechanisms.
• Analysis of cellular and molecular pathways affected by maternal hyperglycemia.

Main Results:

• Hyperglycemia induces oxidative stress, apoptosis, endoplasmic reticulum stress, and epigenetic alterations (DNA methylation, miRNA dysregulation).
• Cellular senescence, mitochondrial dysfunction, and impaired autophagy are key contributors to diabetic embryopathy.
• Interventions like blocking oxidative stress, targeting microRNAs (e.g., mir200c, mir322), and using autophagy activators (trehalose) or senomorphics (rapamycin) show promise.

Conclusions:

• Targeting cellular stress, microRNA dysregulation, senescence, autophagy, or mitochondrial dynamics can prevent structural birth defects in diabetic pregnancies.
• Understanding these pathways is crucial for developing effective interventions against diabetic embryopathy.