Maternal diabetes affects rat offspring retinal structure and function: Sex-specific vulnerabilities at infancy

Area of Science:

• Neuroscience
• Ophthalmology
• Developmental Biology

Background:

• Maternal diabetes poses risks to offspring brain development.
• The impact of maternal diabetes on the developing retina, a neural tissue, is not well understood.
• This study investigates the effects of maternal diabetes on offspring retinal structure and function.

Purpose of the Study:

• To determine if maternal diabetes adversely affects offspring retina development.
• To identify structural and functional deficits in the retinas of offspring exposed to maternal diabetes.
• To assess the efficacy of insulin treatment in mitigating these effects.

Main Methods:

• Retinal structure and function were assessed in infant Wistar rats.
• Techniques included optical coherence tomography and electroretinography.
• Offspring from control, diabetic, and insulin-treated diabetic dams were studied.

Main Results:

• Maternal diabetes delayed eye-opening in offspring; insulin treatment accelerated it.
• Male offspring showed reduced photoreceptor layer thickness and impaired scotopic b-wave and flicker responses.
• Female offspring exhibited decreased cone arrestin levels, while photoreceptor numbers remained unaffected. Dam insulin therapy prevented photoreceptor changes.

Conclusions:

• Maternal diabetes impacts offspring photoreceptors, potentially causing visual impairments.
• Both male and female offspring exhibit distinct vulnerabilities to maternal hyperglycemia during development.
• Insulin treatment for diabetic dams can protect offspring retinas from these adverse effects.