Galectin-3 expression in human atherosclerotic lesions

Area of Science:

• Cardiovascular Biology
• Immunology
• Molecular Biology

Background:

• Atherosclerosis is a chronic inflammatory disease characterized by plaque buildup in arteries.
• Galectin-3, a beta-galactoside-binding lectin, has been implicated in various inflammatory processes.

Purpose of the Study:

• To investigate the expression and localization of galectin-3 in human atherosclerotic lesions.
• To determine the cellular sources of galectin-3 within these lesions.

Main Methods:

• Immunohistochemistry using monoclonal antibodies (M3/38 for galectin-3, 1A4 for smooth muscle alpha-actin, HAM56 for macrophages).
• Reverse transcription polymerase chain reaction (RT-PCR) to quantify galectin-3 mRNA levels.
• Western blot analysis to assess galectin-3 protein levels.

Main Results:

• Galectin-3 was detected in advanced atherosclerotic lesions from carotid endarterectomies and lower limb amputations, but not in normal arteries or umbilical cords.
• Galectin-3 was primarily localized to foam cells and macrophages within atherosclerotic plaques.
• Higher galectin-3 expression was observed in carotid lesions compared to lower limb lesions.
• RT-PCR and Western blot confirmed significantly higher galectin-3 transcripts and protein levels in atherosclerotic arteries versus umbilical cord arteries.

Conclusions:

• Increased expression of galectin-3 in atherosclerotic lesions indicates its involvement in atherogenesis.
• Galectin-3's localization in foam cells and macrophages suggests a role in plaque inflammation and development.