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Mitomycin C-induced apoptosis in cultured human Tenon's capsule fibroblasts
1Department of Ophthalmology, School of Medicine, Catholic University of Taegu-Hyosung, Korea.
Abstract:
To investigate the mitomycin C-induced apoptotic cell death of fibroblasts, the primarily cultured human Tenon's capsule fibroblasts were exposed to a clinically used dosage of 0.4 mg/ml of mitomycin C for 5 minutes. TUNEL (TdT-mediated dUTP-biotin nick end labeling) assay and electron microscopic studies were performed to determine the extent of mitomycin C-induced apoptosis. A flow cytometric study was performed to quantify the apoptotic cell population over time. The TUNEL stains were positive and electron microscopy showed features of apoptotic cell death in some fibroblasts 3 and 5 days after treatment. Flow cytometric analysis using Annexin V-propidium iodide double staining detected apoptotic cells 3 days after treatment. These apoptotic cell populations increased at 4 days and were sustained for one week. This study revealed that the clinical effects of mitomycin C on fibroblasts may be mediated not only by antiproliferative but also apoptotic cell death to some degree. Therefore, the apoptotic cell death of fibroblasts induced by mitomycin C should be considered to properly understand the mechanism of wound healing after trabeculectomy with adjunctive mitomycin C.
Insights
Mitomycin C induces fibroblast apoptosis, a process crucial for understanding wound healing after glaucoma surgery. This cell death mechanism complements its known antiproliferative effects.
Area of Science:
- Ophthalmology
- Cell Biology
- Pharmacology
Background:
- Mitomycin C is clinically used to prevent scarring after glaucoma surgery.
- Its antiproliferative effects on fibroblasts are well-established.
- The role of apoptosis in Mitomycin C's action requires further elucidation.
Purpose of the Study:
- To investigate Mitomycin C-induced apoptotic cell death in human Tenon's capsule fibroblasts.
- To quantify the extent and duration of apoptosis following clinical Mitomycin C exposure.
Main Methods:
- Primary human Tenon's capsule fibroblasts were treated with a clinical dose of Mitomycin C.
- TUNEL assay and electron microscopy were used to detect apoptosis.
- Flow cytometry with Annexin V/propidium iodide staining quantified apoptotic cell populations over time.
Main Results:
- TUNEL staining and electron microscopy confirmed apoptotic features in fibroblasts 3-5 days post-treatment.
- Flow cytometry detected apoptotic cells by day 3, with increased populations at day 4, sustained for one week.
- Mitomycin C induced significant fibroblast apoptosis in addition to its antiproliferative effects.
Conclusions:
- Mitomycin C induces fibroblast apoptosis, contributing to its clinical effects.
- Understanding Mitomycin C-mediated apoptosis is essential for comprehending wound healing post-trabeculectomy.
- This finding has implications for optimizing glaucoma surgical outcomes.