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Palmitic Acid Induces Müller Cell Inflammation that is Potentiated by Co-treatment with Glucose
Megan E Capozzi1, Meredith J Giblin2, John S Penn3,2,4
1Department of Molecular Physiology and Biophysics at Vanderbilt University, 1301 Medical Center Drive TVC B706-A, Nashville, TN, 37232-0028, USA. megan.e.capozzi@vanderbilt.edu.
Abstract:
Chronic hyperglycemia is thought to be the major stimulator of retinal dysfunction in diabetic retinopathy (DR). Thus, many diabetes-related systemic factors have been overlooked as inducers of DR pathology. Cell culture models of retinal cell types are frequently used to mechanistically study DR, but appropriate stimulators of DR-like factors are difficult to identify. Furthermore, elevated glucose, a gold standard for cell culture treatments, yields little to no response from many primary human retinal cells. Thus, the goal of this project was to demonstrate the effectiveness of the free fatty acid, palmitic acid and compare its use alone and in combination with elevated glucose as a stimulus for human Müller cells, a retinal glial cell type that is activated early in DR pathogenesis and uniquely responsive to fatty acids. Using RNA sequencing, we identified a variety of DR-relevant pathways, including NFκB signaling and inflammation, intracellular lipid signaling, angiogenesis, and MAPK signaling, that were stimulated by palmitic acid, while elevated glucose alone did not significantly alter any diabetes-relevant pathways. Co-treatment of high glucose with palmitic acid potentiated the expression of several DR-relevant angiogenic and inflammatory targets, including PTGS2 (COX-2) and CXCL8 (IL-8).
Insights
Palmitic acid, not high glucose, stimulates Müller cells relevant to diabetic retinopathy (DR). Combining palmitic acid with glucose potentiates DR-related inflammatory and angiogenic factors, offering new insights into DR pathology.
Area of Science:
- Ophthalmology
- Endocrinology
- Cell Biology
Background:
- Diabetic retinopathy (DR) is linked to chronic hyperglycemia, but other systemic factors are overlooked.
- Current cell culture models struggle to replicate DR pathology due to limited responses to elevated glucose.
- Human Müller cells, crucial in early DR, are uniquely responsive to fatty acids.
Purpose of the Study:
- To assess palmitic acid as a stimulus for human Müller cells in DR research.
- To compare palmitic acid alone versus in combination with elevated glucose.
- To identify DR-relevant pathways activated by these stimuli.
Main Methods:
- Utilized RNA sequencing to analyze gene expression in human Müller cells.
- Treated cells with palmitic acid and/or elevated glucose.
- Focused on identifying activated DR-relevant signaling pathways.
Main Results:
- Palmitic acid alone significantly stimulated DR-relevant pathways: NFκB signaling, inflammation, lipid signaling, angiogenesis, and MAPK signaling.
- Elevated glucose alone did not significantly alter diabetes-relevant pathways.
- Combined treatment potentiated expression of angiogenic and inflammatory targets like PTGS2 (COX-2) and CXCL8 (IL-8).
Conclusions:
- Palmitic acid is an effective stimulus for modeling DR pathology in human Müller cells.
- Fatty acids, not just glucose, play a critical role in DR pathogenesis.
- Combined palmitic acid and glucose treatments highlight synergistic effects on key DR pathways, offering therapeutic targets.
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