Related Experiment Videos
Androgen receptors in osteoblast-like cell lines
E S Orwoll1, L Stribrska, E E Ramsey
1Portland VA Medical Center, Oregon 97207.
Calcified Tissue International
|September 1, 1991
Summary
Osteoblastic cells possess specific androgen receptors, crucial for understanding how androgens influence bone remodeling. These findings in human and rat cell lines pave the way for further research into androgenic effects on bone.
Area of Science:
- Endocrinology
- Bone Biology
- Cellular and Molecular Biology
Background:
- Androgens significantly impact bone remodeling, but the underlying mechanisms are not fully understood.
- The potential presence of sex steroid receptors in osteoblastic cells is a recent area of investigation.
Purpose of the Study:
- To investigate the presence and characteristics of specific, high-affinity androgen receptors in osteoblastic cell lines.
- To determine if these receptors are similar to those found in classical androgen target tissues.
Main Methods:
- Examined human (Saos-2, U2-OS) and rat (UMR-106.01) osteoblastic cell lines for androgen binding.
- Assessed binding affinity (KD) and receptor concentration (sites/cell).
- Utilized enzyme-linked receptor immunoassay to detect estrogen and progesterone receptors.
Main Results:
- All studied cell lines exhibited specific, high-affinity androgen binding sites (KD = 1.6 - 2.5 x 10(-10) M).
- Human cell lines showed higher androgen receptor concentrations (1277-1605 sites/cell) than the rat cell line (74 sites/cell).
- Estrogen receptors were undetectable in all cell lines; progesterone receptors were found in human lines.
Conclusions:
- Osteoblastic cell lines possess functional androgen receptors comparable to those in classical target tissues.
- These cell lines serve as valuable models for studying androgen regulation of osteoblast function and bone remodeling.