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Proteomic Profiling Revealed Mitochondrial Dysfunction in Photoreceptor Cells under Hyperglycemia.
Christie Hang-I Lam1,2, Jimmy Ka-Wai Cheung1,2, Dennis Yan-Yin Tse1,2,3
1School of Optometry, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
International Journal of Molecular Sciences
|November 11, 2022
Summary
High glucose levels directly harm photoreceptor cells, a key component of the retina, by increasing apoptosis and oxidative stress. This study reveals mitochondrial dysfunction as a critical mechanism in diabetic retinopathy (DR) development.
Area of Science:
- Ophthalmology
- Diabetology
- Cell Biology
- Proteomics
Background:
- Diabetic retinopathy (DR) is a leading cause of blindness, affecting retinal neurons and vasculature.
- Photoreceptor cells, susceptible to diabetic conditions, have been understudied in DR pathogenesis.
- Previous research suggests photoreceptors contribute to DR via inflammatory molecules and reactive oxygen species (ROS).
Purpose of the Study:
- To investigate the direct impact of hyperglycemia on photoreceptor cells.
- To elucidate the underlying molecular mechanisms of high glucose effects on photoreceptors.
- To explore the role of photoreceptors in the pathogenesis of diabetic retinopathy.
Main Methods:
- Utilized a 661w photoreceptor-like cell line to model high glucose exposure.
- Employed a data-independent sequential window acquisition of all theoretical mass spectra (SWATH)-based proteomic approach.
- Analyzed proteomic profile changes induced by high glucose conditions.
Main Results:
- High glucose significantly increased apoptosis and reactive oxygen species (ROS) levels in 661w cells.
- Mitochondrial dysfunction was identified as a major affected pathway.
- Observed increased mitochondrial fission and reduced mitochondrial bioenergetics under high glucose.
Conclusions:
- Hyperglycemia directly induces cellular damage, apoptosis, and oxidative stress in photoreceptors.
- Mitochondrial dysfunction plays a crucial role in high glucose-induced photoreceptor damage.
- Findings support a significant role for photoreceptors in the pathogenesis of diabetic retinopathy.
