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Androgen receptors in bone-forming tissue.
B Noble1, J Routledge, H Stevens
1University of Cambridge School of Clinical Medicine (Bone Research Group), Level 4, Addenbrooke's Hospital, Cambridge, UK.
Hormone Research
|March 30, 1999
Summary
Androgen receptors (AR) are present in human growth plates and osteoblasts. AR translocation to the nucleus in osteoblasts may depend on differentiation and culture conditions.
Area of Science:
- Endocrinology
- Cell Biology
- Orthopedics
Background:
- Androgen receptors (AR) play a role in various physiological processes.
- Understanding AR localization and function in bone cells is crucial for skeletal development and health.
Purpose of the Study:
- To investigate the presence and localization of androgen receptors in human growth plate chondrocytes and osteoblasts.
- To examine the translocation of AR into the nucleus of osteoblasts in response to androgens.
Main Methods:
- Immunohistochemical staining of AR in human growth plate sections and cultured osteoblasts.
- Culturing human osteoblasts with androgens (5alpha-dihydrotestosterone, methyltrienolone) and assessing AR localization via microscopy.
Main Results:
- AR were predominantly found in the cytoplasm of chondrocytes in the human growth plate.
- Osteoblasts and osteocytes exhibited numerous AR, primarily in the cytoplasm.
- Androgen stimulation induced AR translocation into the nucleus in osteoblasts from some, but not all, specimens.
Conclusions:
- Androgen receptors are present in human growth plate chondrocytes and osteoblasts.
- Osteoblasts derived from osteoarthritic patients show AR translocation to the nucleus upon androgen exposure.
- The capacity for AR nuclear translocation in osteoblasts may be influenced by cellular differentiation and culture conditions.
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