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[Bone metabolism in aromatase-knockout mice]
1Department of Biochemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Science.
Abstract:
Aromatase is the sole enzyme which converts androgen into estrogen. We have reported that aromatase-knockout (ArKO) mice showed bone loss by increased bone resorption not only in female but also in male mice, suggesting essential roles of estrogen in bone metabolism in both sexes. When ArKO mice were orchidectomized (ORX) to induce a double deficiency of estrogen and androgen, ORX/ArKO mice showed severe osteopenia. In females, estrogen is major sex steroid for bone turnover. However, estrogen and androgen may play distinct roles in bone turnover of male mice before and after reaching sexual maturity.
Insights
Estrogen is crucial for bone health in both male and female mice. Aromatase knockout mice lacking estrogen experienced significant bone loss, highlighting estrogen's vital role in maintaining bone metabolism.
Area of Science:
- Endocrinology and Bone Metabolism
- Reproductive Biology
Context:
- Aromatase is the key enzyme in estrogen synthesis from androgens.
- Estrogen plays a critical role in bone metabolism for both sexes.
- Aromatase-knockout (ArKO) mice models are used to study estrogen deficiency effects.
Purpose:
- To investigate the distinct roles of estrogen and androgen in male bone turnover.
- To assess the impact of combined estrogen and androgen deficiency on bone health.
- To understand the consequences of aromatase deficiency on bone resorption and bone density.
Summary:
- Aromatase-knockout (ArKO) mice exhibited increased bone resorption and bone loss, indicating estrogen's essential role in bone metabolism in both male and female mice.
- Orchidectomized ArKO (ORX/ArKO) mice, with a double deficiency in estrogen and androgen, developed severe osteopenia.
- These findings suggest that while estrogen is vital for bone turnover, androgen may also play a distinct role in male bone health, particularly before and after sexual maturity.
Impact:
- Estrogen is essential for maintaining bone density and preventing bone loss in both sexes.
- The study highlights the complex interplay between estrogen and androgen in regulating male bone metabolism.
- Understanding these hormonal roles is crucial for developing therapeutic strategies for bone diseases.
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