Limbal epithelial stem-microenvironmental alteration leads to pterygium development.
Prosun Das1, Arjun Gokani, Ketaki Bagchi
1Stem Cell Research and Application Unit, Department of Biochemistry and Medical Biotechnology, Calcutta School of Tropical Medicine, 108 C R Avenue, Kolkata, 700073, India.
Molecular and Cellular Biochemistry
|January 7, 2015
Summary
Pterygium is linked to changes in the limbal stem cell niche, causing ocular surface issues. This study reveals a disrupted stem-microenvironmental network, leading to abnormal cell growth in the cornea.
Area of Science:
- Ophthalmology
- Stem Cell Biology
- Tissue Homeostasis
Background:
- Tissue homeostasis depends on regulated stem cell activity within a specific microenvironment.
- Dysregulation of the stem cell niche can lead to disease development.
- Limbal epithelial stem cells (LESCs) are crucial for maintaining corneal integrity.
Purpose of the Study:
- To investigate microenvironmental alterations in LESCs during pterygium development compared to healthy corneas.
- To understand the relationship between stem cells and their niche in the context of ocular surface disorders.
Main Methods:
- Clinical evaluation of pterygium patients for ocular surface abnormalities.
- Histology and scanning electron microscopy to assess structural changes in LESCs and their niche.
- Analysis of gene and receptor expression (TGFβ-R1, EGF-R1, IL6-Rα, IL2-Rα, TERT, Cyclin-D1, PCNA).
Main Results:
- Pterygium exhibited ocular surface disorders including corneal vascularization and limbal thickening.
- Structural abnormalities were observed in LESCs and niche components.
- Aberrant expression of key receptors (TGFβ-R1, EGF-R1, IL6-Rα, IL2-Rα) indicated a disrupted stem-microenvironmental network.
- Increased expression of proliferation markers (TERT, Cyclin-D1, PCNA) in pterygium epithelial cells.
Conclusions:
- Pterygium is associated with limbal microenvironmental anomalies.
- The stem-microenvironmental network is disrupted in pterygium, leading to hyperproliferation of limbal epithelial cells.
- This disruption contributes to the pathogenesis of pterygium and loss of corneal homeostasis.
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