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[Lectin receptors in transitional cell tumors of the bladder]
Abstract:
Binding sites for lectins of peanuts, soya-beans and concanavalin A were identified in the tissues of normal human urinary bladder and its transitional cell tumors (31 patients) using the lectin-peroxidase technique. No binding sites for any of the lectins were found in normal urothelium. Receptors for peanut and soya-bean lectins were observed on the plasma membranes of 20% of tumor cells in transitional cell papillomas. A diffuse distribution of those lectins in tumor cell cytoplasm was interpreted as a tendency to malignant transformation of tumor. There were no concanavalin A receptors in tumor cells.
Insights
Lectins from peanuts and soybeans bind to human bladder tumor cells, but not normal urothelium. This binding, especially in the cytoplasm, may indicate a tendency towards malignant transformation in bladder tumors.
Area of Science:
- Biochemistry
- Oncology
- Urology
Context:
- Investigating cell surface and cytoplasmic markers in human urinary bladder tissues.
- Utilizing lectin-peroxidase technique to identify specific carbohydrate-binding proteins.
Purpose:
- To identify and characterize lectin binding sites in normal human urothelium and transitional cell tumors.
- To explore potential correlations between lectin receptor expression and tumor malignancy.
Summary:
- No lectin binding sites were detected in normal human urothelium.
- Peanut and soya-bean lectin receptors were found on the plasma membranes of 20% of transitional cell papilloma cells.
- Diffuse cytoplasmic distribution of peanut and soya-bean lectins in tumor cells suggests a potential marker for malignant transformation; concanavalin A receptors were absent in tumor cells.
Impact:
- Provides insights into the altered glycosylation patterns in bladder cancer.
- Suggests potential diagnostic or prognostic markers based on lectin binding.
- Highlights differences in lectin receptor expression between normal and cancerous bladder tissues.