Glycophenotype of prostatic carcinomas

Area of Science:

• Biochemistry
• Oncology
• Glycobiology

Background:

• Carbohydrate antigens on tumor cell surfaces influence prostate cancer progression and metastasis.
• Understanding glycosylation changes is crucial for identifying potential biomarkers and therapeutic targets.

Purpose of the Study:

• To investigate alterations in glycosylation patterns in prostatic carcinoma compared to benign prostate tissue.
• To identify specific changes in oligosaccharide sequences and Lewis antigen expression.

Main Methods:

• Comparative lectin-histochemical analysis of 27 prostatic carcinoma and benign prostate samples.
• Utilized fifteen biotinylated lectins and monoclonal antibodies against Lewis antigens.
• Employed a semi-quantitative study to analyze staining intensity and binding patterns.

Main Results:

• Prostatic carcinoma exhibited distinct glycophenotypes with increased staining for several lectins (AAA, UEA-1, DBA, WFA, VVA, HPA, BSA-1B4, MPA, ECA, AHA, CTA).
• Lewis antigens (Lewisa, sialyl Lewisa, sialyl Lewisx) were expressed in carcinomas but absent in benign tissues.
• Observed increased fucosylation, galactosylation, branching, and sialylation on O-glycans in cancer cells.

Conclusions:

• Prostate cancer cells undergo significant glycophenotypic modifications.
• These changes involve altered fucosylation, galactosylation, and sialylation patterns, particularly on O-glycans.
• The expression of Lewis antigens in carcinoma suggests their potential role in cancer development or progression.