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Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions
Published on: January 20, 2022
Galectin-3 is associated with prostasomes in human semen
Jennifer L Jones1, Sarika Saraswati, Ashley S Block
1Department of Biochemistry and Molecular Biology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
Glycoconjugate Journal
|October 16, 2009
Summary
Galectin-3, a key protein in immunity and cancer, is identified in human semen and prostasomes. This finding opens new research avenues for galectin-3
Area of Science:
- Reproductive Biology
- Immunology
- Molecular Biology
Background:
- Galectin-3 is a beta-galactoside-binding protein implicated in immunomodulation, cell interactions, cancer, and infectious diseases.
- The role of galectin-3 in the male reproductive system and its presence in seminal components were previously uncharacterized.
Purpose of the Study:
- To identify and characterize galectin-3 within human semen and its associated reproductive tissues.
- To investigate the presence and localization of galectin-3 in prostasomes, key vesicles in seminal plasma.
Main Methods:
- Protein extracts from male reproductive tissues (testis, epididymis, vas deferens, prostate, seminal vesicle) and sperm were analyzed.
- Two-dimensional immunoblotting, affinity purification, and tandem mass spectrometry were employed to identify and characterize galectin-3 in seminal plasma and prostasomes.
- Surface biotinylation was used to determine the localization of galectin-3 on prostasomes.
Main Results:
- Galectin-3 was detected in protein extracts from all analyzed male reproductive tissues and sperm.
- In seminal plasma, galectin-3 was found in both soluble fractions and prostasomes, with five isoelectric variants identified in prostasomes.
- A truncated galectin-3 variant with conserved carbohydrate-binding activity was identified on the prostasome surface, alongside intact galectin-3.
Conclusions:
- The study confirms the presence of galectin-3 throughout the male reproductive tract and within prostasomes.
- The identification of intact and truncated galectin-3 on prostasomes suggests a regulatory role in reproductive functions and disease.
- These findings provide a foundation for exploring galectin-3's involvement in reproduction, infection transmission, and prostate cancer progression.
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