Mechanistic insights into SOCS5-related DNA damage and cellular senescence in diabetic retinopathy

Area of Science:

• Ophthalmology
• Molecular Biology
• Genetics

Background:

• Diabetic retinopathy (DR) is a leading cause of vision loss.
• The underlying molecular mechanisms of DR, particularly involving DNA damage and cellular senescence, require further elucidation.

Purpose of the Study:

• To investigate the mechanistic role of Suppressor of Cytokine Signaling 5 (SOCS5) in the pathogenesis of diabetic retinopathy (DR).
• To identify key molecular players and signaling pathways involved in DR progression.
• To explore potential therapeutic targets for DR intervention.

Main Methods:

• In vitro studies using high glucose (HG)-induced human retinal microvascular endothelial cells (HRMECs).
• In vivo studies utilizing streptozotocin-induced DR mouse models.
• Analysis of SOCS5 expression, DNA damage markers, cellular senescence, and apoptosis.
• Investigation of the POU Class 2 Homeobox 1 (POU2F1)-SOCS5-CDKN1A signaling axis.

Main Results:

• SOCS5 was significantly upregulated in DR.
• SOCS5 knockdown ameliorated retinal tissue damage, vascular leakage, and apoptosis in DR mice.
• SOCS5 reduction decreased DNA damage and cellular senescence in HG-stimulated HRMECs.
• SOCS5 promotes DR by regulating CDKN1A expression, forming a POU2F1-SOCS5-CDKN1A axis.
• Inhibition of POU2F1 and SOCS5 alleviated DR pathology in mice.

Conclusions:

• SOCS5 plays a critical mechanistic role in DR pathogenesis by mediating DNA damage and cellular senescence.
• The novel POU2F1-SOCS5-CDKN1A axis is identified as a key driver of DR.
• Targeting SOCS5 and POU2F1 presents a promising therapeutic strategy for managing diabetic retinopathy.