Kinase PIM1 governs ferroptosis to reduce retinal microvascular endothelial cell dysfunction triggered by high...

Area of Science:

• Cell Biology
• Molecular Biology
• Ophthalmology

Background:

• High glucose levels induce cellular stress and apoptosis, contributing to diabetic retinopathy.
• The Pim-1 proto-oncogene, serine/threonine kinase (PIM1) has been implicated in cellular stress responses.

Purpose of the Study:

• To investigate the role and regulatory mechanism of PIM1 in high glucose-induced human retinal microvascular endothelial cell (hRMEC) dysfunction.
• To explore PIM1's influence on ferroptosis in the context of diabetic retinopathy.

Main Methods:

• hRMECs were exposed to high glucose conditions.
• PIM1 expression was manipulated (overexpressed).
• Cellular responses including inflammatory factors, oxidative stress, migration, tube formation, tight junction proteins, and ferroptosis markers were assessed. Erastin, a ferroptosis inducer, was used to confirm mechanisms.

Main Results:

• High glucose downregulated PIM1 expression in hRMECs.
• PIM1 overexpression mitigated high glucose-induced inflammation, oxidative stress, and impaired cell migration/tube formation.
• PIM1 overexpression preserved tight junction protein levels and reduced markers of ferroptosis, including intracellular iron and lipid peroxidation.
• Erastin treatment reversed the protective effects of PIM1, confirming ferroptosis mediation.

Conclusions:

• PIM1 plays a protective role against high glucose-induced hRMEC dysfunction.
• PIM1 ameliorates diabetic retinopathy pathology by inhibiting ferroptosis.
• Targeting PIM1 may represent a novel therapeutic strategy for diabetic retinopathy.