Resilience to Diabetic Retinopathy (RDR) Is Associated with a Pre-Retinopathy Transcriptional Program Induced by...

Area of Science:

• Ophthalmology
• Molecular Biology
• Genetics

Background:

• Diabetic retinopathy (DR) is a leading cause of vision loss.
• Resilience to DR (RDR) is a transient protective state observed in early diabetes mellitus (DM).
• Understanding the molecular mechanisms underlying RDR is crucial for developing new therapeutic strategies.

Purpose of the Study:

• To define gene expression changes associated with the acquisition and loss of RDR in individual retinal cell types.
• To investigate the role of Müller cells in RDR.
• To identify molecular pathways involved in RDR.

Main Methods:

• Induction of type 1 diabetes mellitus (DM) in male C57Bl6J mice using streptozotocin.
• Single-cell RNA sequencing of retinas from mice with DM for 5 or 15 days, and age-matched controls.
• Bioinformatic analysis to identify differentially expressed genes and pathway enrichments.

Main Results:

• Acquisition of RDR after 5 days of DM was linked to altered gene expression in a subset of retinal cells, predominantly Müller cells.
• Pathway analysis revealed enhanced protective mechanisms, including phagocytosis, integrin signaling, and interferon-mediated defense.
• This pro-protection gene expression surge subsided by day 15 of DM, coinciding with waning RDR.

Conclusions:

• A short duration of DM, even without causing DR, profoundly alters gene expression in retinal cells, particularly Müller cells.
• These molecular changes represent an activation of defense programs rather than a prelude to damage.
• The temporal correlation between RDR and Müller cell defense activation provides a molecular basis for the retina's transient health during early DM.