High glucose changes extracellular adenosine triphosphate levels in rat retinal cultures

Area of Science:

• Ophthalmology
• Neuroscience
• Cell Biology

Background:

• Diabetic retinopathy (DR) is a leading cause of adult blindness.
• Diabetes triggers retinal inflammation via microglial activation and inflammatory mediators.
• The precise mechanism linking diabetes to retinal inflammation remains unclear.

Purpose of the Study:

• To investigate the effect of high glucose on extracellular adenosine triphosphate (ATP) levels in retinal cell cultures.
• To explore the role of purinergic signaling in high-glucose-induced retinal inflammation.

Main Methods:

• Cultured retinal cells exposed to high glucose (hyperglycemia model).
• Measured extracellular ATP levels following depolarizing stimuli.
• Assessed ATP degradation and intracellular calcium concentrations.
• Utilized botulinum neurotoxin A and calcium removal to investigate mechanisms.

Main Results:

• High glucose significantly increased extracellular ATP release after stimulation.
• ATP elevation was dependent on extracellular calcium and sensitive to botulinum neurotoxin A.
• Degradation of extracellular ATP was reduced in high-glucose conditions.
• High glucose enhanced intracellular calcium concentration changes.

Conclusions:

• High glucose disrupts the retinal purinergic system by increasing ATP exocytosis and reducing degradation.
• Elevated extracellular ATP in diabetic retinas may promote inflammation contributing to DR pathogenesis.