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Plasma testosterone-binding proteins in the developing rat
Steroids
|September 1, 1981
Summary
Two testosterone-binding proteins were identified in male rat plasma, showing distinct molecular weights and high affinity for androgens. Their concentrations change significantly during early development, with one form disappearing by 5 weeks.
Area of Science:
- Endocrinology
- Biochemistry
- Molecular Biology
Background:
- Testosterone-binding proteins play a crucial role in regulating androgen activity.
- Understanding the developmental expression of these proteins is key to comprehending male reproductive physiology.
Purpose of the Study:
- To identify and characterize testosterone-binding proteins in developing male rats.
- To investigate the developmental changes in the concentration and forms of these proteins.
Main Methods:
- Analysis of male rat plasma using Sephadex G-200 gel filtration chromatography.
- Assessment of binding affinities for androgens, estrogens, and corticoids.
Main Results:
- Two distinct testosterone-binding proteins with similar binding characteristics were identified.
- Protein concentrations peaked around 20 days postpartum, with significant developmental changes observed.
- A higher molecular weight form disappeared by 5 weeks, while a lower molecular weight form persisted at reduced levels.
Conclusions:
- Male rats express at least two testosterone-binding proteins with high androgen affinity during early development.
- The expression and forms of these proteins undergo significant dynamic changes postnatally.
- These findings contribute to understanding the regulation of androgens during male rat maturation.