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Androphilic proteins in the human prostate
The Prostate. Supplement
|January 1, 1981
Summary
Human prostate cytosol contains dihydrotestosterone-binding proteins distinct from R1881 and R5020 binders. Nuclear extracts suggest a lack of progestin receptors in the prostate, with dihydrotestosterone binding differing between normal and pathological tissues.
Area of Science:
- Endocrinology
- Molecular Biology
- Urology
Background:
- Androgen and progestin receptors play critical roles in prostate physiology and pathology.
- Understanding the specific binding proteins for androgens like dihydrotestosterone (DHT) and synthetic steroids like R1881 and R5020 is crucial for prostate cancer research.
- Previous studies have characterized steroid-binding proteins, but their specific roles and distribution in the human prostate require further elucidation.
Purpose of the Study:
- To characterize and compare the binding properties of dihydrotestosterone (DHT), R1881, and R5020 in human prostate cytosols and nuclear extracts.
- To investigate potential differences in steroid-binding protein expression between normal and pathological prostate tissues.
- To determine the cellular localization of R1881-binding sites within the human prostate.
Main Methods:
- Cytosol and nuclear extracts were prepared from human prostate tissues.
- Radioligand binding assays were performed using [3H]dihydrotestosterone, [3H]R1881, and [3H]R5020 to assess binding affinities and capacities.
- Histochemical staining was employed to visualize the cellular distribution of R1881-binding sites.
Main Results:
- Dihydrotestosterone-binding proteins in prostate cytosols differed from R1881 and R5020-binding proteins.
- R1881 and R5020 binding proteins in cytosol were similar, with R1881 sites largely capable of binding R5020.
- Nuclear extracts showed equal binding for DHT and R1881, but not R5020, suggesting no significant progestin receptor presence. DHT binding was higher in normal prostates than pathological ones.
- R1881 binding was localized to epithelial and malignant cells, excluding stromal cells.
Conclusions:
- The human prostate cytosol contains distinct dihydrotestosterone-binding proteins.
- Evidence suggests the absence of a functional progestin receptor in the human prostate nuclear compartment.
- Differences in DHT binding between normal and pathological prostates, along with specific cellular localization of R1881 binding, may have implications for understanding prostate cancer development and progression.