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

Abstract

Pregestational diabetes, either type 1 or type 2 diabetes, induces structural birth defects including neural tube defects and congenital heart defects in human fetuses. Rodent models of type 1 and type 2 diabetic embryopathy have been established and faithfully mimic human conditions. Hyperglycemia of maternal diabetes triggers oxidative stress in the developing neuroepithelium and the embryonic heart leading to the activation of proapoptotic kinases and excessive cell death. Oxidative stress also activates the unfolded protein response and endoplasmic reticulum stress. Hyperglycemia alters epigenetic landscapes by suppressing histone deacetylation, perturbing microRNA (miRNA) expression, and increasing DNA methylation. At cellular levels, besides the induction of cell apoptosis, hyperglycemia suppresses cell proliferation and induces premature senescence. Stress signaling elicited by maternal diabetes disrupts cellular organelle homeostasis leading to mitochondrial dysfunction, mitochondrial dynamic alteration, and autophagy impairment. Blocking oxidative stress, kinase activation, and cellular senescence ameliorates diabetic embryopathy. Deleting the mir200c gene or restoring mir322 expression abolishes maternal diabetes hyperglycemia-induced senescence and cellular stress, respectively. Both the autophagy activator trehalose and the senomorphic rapamycin can alleviate diabetic embryopathy. Thus, targeting cellular stress, miRNAs, senescence, or restoring autophagy or mitochondrial fusion is a promising approach to prevent poorly controlled maternal diabetes-induced structural birth defects. In this review, we summarize the causal events in diabetic embryopathy and propose preventions for this pathological condition.

Key Points

• Maternal diabetes induces structural birth defects.

• Kinase signaling and cellular organelle stress are critically involved in neural tube defects.

• Maternal diabetes increases DNA methylation and suppresses developmental gene expression.

• Cellular apoptosis and senescence are induced by maternal diabetes in the neuroepithelium.

• microRNAs disrupt mitochondrial fusion leading to congenital heart diseases in diabetic pregnancy.

Keywords

pregestational diabetes - neural tube defects - congenital heart defects - DNA methylation - histone acetylation - ER stress - autophagy - mitochondrial dynamics - microRNA - senescence

Publication History

Received: 13 May 2024

Accepted: 26 August 2024

Accepted Manuscript online:
29 August 2024

Article published online:
27 September 2024

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