Microarray and protein analysis of human pterygium.

Area of Science:

• Ophthalmology
• Molecular Biology
• Genetics

Background:

• Pterygium is a common, sunlight-induced ocular surface lesion that can impair vision.
• Understanding the genetic basis of pterygium is crucial for developing effective treatments.

Purpose of the Study:

• To identify genes associated with pterygium pathogenesis by analyzing global gene expression profiles.
• To compare gene expression in pterygium tissue with autologous conjunctiva, limbal, and corneal tissues.

Main Methods:

• Oligonucleotide microarray hybridization was employed to compare gene expression between pterygium and conjunctiva.
• Reverse transcription polymerase chain reaction (RT-PCR), western blot, and immunohistochemistry were used for further gene characterization.

Main Results:

• Thirty-four genes showed significant expression differences (≥2 fold) between pterygium and conjunctiva.
• Increased expression of fibronectin, macrophage-inflammatory protein-4 (MIP-4), and lipocalin 2 (NGAL) was observed in pterygium.
• Fibronectin and MIP-4 were elevated in pterygium compared to limbus, cornea, and conjunctiva, with MIP-4 found throughout the pterygium tissue.

Conclusions:

• The study identified novel and known genes related to extracellular matrix, inflammation, angiogenesis, fibrosis, and oncogenesis in pterygium.
• Increased lipocalin 2 expression in pterygium correlates with elevated matrix metalloproteinases (MMPs), supporting previous findings.
• Gene expression patterns in pterygium provide insights into its pathogenesis and potential therapeutic targets.