Aberrations in Cell Signaling Quantified in Diabetic Murine Globes after Injury
Nicholas A Azzari1, Kristen L Segars2, Srikar Rapaka3
1Department of Biochemistry and Cell Biology, Boston University Chobanian and Avedisian School of Medicine, 72 E. Concord St., Boston, MA 02118, USA.
Abstract:
The corneal epithelium is an avascular structure that has a unique wound healing mechanism, which allows for rapid wound closure without compromising vision. This wound healing mechanism is attenuated in diabetic patients, resulting in poor clinical outcomes and recurrent non-healing erosion. We investigated changes in cellular calcium signaling activity during the wound response in murine diabetic tissue using live cell imaging from both ex vivo and in vitro models. The calcium signaling propagation in diabetic cells was significantly decreased and displayed altered patterns compared to non-diabetic controls. Diabetic cells and tissue display distinct expression of the purinergic receptor, P2X7, which mediates the wound healing response. We speculate that alterations in P2X7 expression, interactions with other proteins, and calcium signaling activity significantly impact the wound healing response. This may explain aberrations in the diabetic wound response.
Insights
Diabetic corneal cells show impaired calcium signaling and altered P2X7 receptor expression, hindering wound healing. This research sheds light on diabetic eye disease mechanisms.
Area of Science:
- Ophthalmology
- Cell Biology
- Diabetic Complications
Background:
- The corneal epithelium's rapid wound healing is crucial for vision.
- Diabetes mellitus impairs this healing process, leading to chronic wounds.
Purpose of the Study:
- To investigate cellular calcium signaling and P2X7 receptor expression in diabetic corneal wound healing.
- To understand the mechanisms behind impaired wound repair in diabetic patients.
Main Methods:
- Live cell imaging of ex vivo and in vitro murine diabetic corneal models.
- Analysis of calcium signaling propagation patterns.
- Assessment of P2X7 purinergic receptor expression.
Main Results:
- Diabetic corneal cells exhibited significantly decreased and altered calcium signaling compared to controls.
- Distinct P2X7 purinergic receptor expression patterns were observed in diabetic cells and tissue.
- Impaired calcium signaling and P2X7 expression correlate with poor wound healing.
Conclusions:
- Alterations in P2X7 receptor expression and calcium signaling significantly impact corneal wound healing in diabetes.
- These findings may explain the aberrant wound response observed in diabetic patients.
- Targeting P2X7 and calcium pathways could offer therapeutic strategies for diabetic corneal complications.
