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[Androgen binding by skeletal muscle nuclei]
Summary
Researchers identified specific androgen receptors in rat skeletal muscle nuclei. These receptors are proteins that bind to 3H-19-nortestosterone, with DNA stabilizing their structure.
Area of Science:
- Endocrinology
- Molecular Biology
- Biochemistry
Context:
- Investigates the binding characteristics of androgens in rat skeletal muscle.
- Focuses on the interaction of 3H-19-nortestosterone with isolated nuclei and nuclear extracts.
Purpose:
- To characterize the binding affinity and capacity of androgen receptors in rat skeletal muscle.
- To determine the proteinaceous nature of nuclear androgen receptors and the influence of DNA.
Summary:
- Specific binding of 3H-19-nortestosterone to rat skeletal muscle nuclei and 0.4 M KCl nuclear extracts was observed.
- Dissociation constants (Kd) were measured at approximately 11.6 nM and 9.9 nM, respectively.
- Nuclear androgen receptors were confirmed as proteins through enzymatic digestion, with DNA exhibiting a stabilizing effect.
Impact:
- Provides insights into the molecular mechanisms of androgen action in skeletal muscle.
- Characterizes androgen receptor properties, crucial for understanding muscle growth and maintenance.
- Demonstrates that DNase treatment enhances the extraction of nuclear androgen receptors.