Carbohydrate binding proteins galectin-1 and galectin-3 in human trabecular meshwork

Area of Science:

• Ophthalmology
• Molecular Biology
• Cell Biology

Background:

• Galectins are carbohydrate-binding proteins involved in cell-cell and cell-matrix interactions.
• Their role in ocular tissues, specifically the trabecular meshwork and Schlemm's canal, is not well understood.

Purpose of the Study:

• To investigate the expression of galectin-1 and galectin-3 in the human trabecular meshwork and Schlemm's canal.
• To determine if galectin expression differs between normal and glaucomatous eyes.

Main Methods:

• Human trabecular meshwork tissues were obtained from donor eyes.
• Gene and protein expression of galectin-1 and galectin-3 were analyzed using RT-PCR and Western blot.
• Immunohistochemistry was performed on normal and glaucomatous tissues.

Main Results:

• Messenger RNA (mRNA) and protein for galectin-1 (14 kDa) and galectin-3 (31 kDa) were detected in the ocular outflow pathway.
• Immunostaining confirmed the presence of galectin-1 and galectin-3 in the trabecular meshwork, Schlemm's canal lining cells, and extracellular spaces.
• No significant differences in the location or intensity of galectin-1 and galectin-3 expression were observed between normal, primary open-angle glaucoma (POAG), and pseudoexfoliation (PEX) samples.

Conclusions:

• Galectin-1 and galectin-3 are expressed in the human trabecular meshwork of both normal and glaucomatous eyes.
• The presence of these galectins in the ocular outflow pathway suggests a potential role in regulating intraocular pressure and aqueous humor dynamics.