Bone strength is reduced in a neonatal androgenized rat model

Area of Science:

• Endocrinology
• Bone Biology
• Reproductive Science

Background:

• Polycystic ovary syndrome (PCOS) is a complex endocrine disorder with debated effects on bone health.
• An androgenized rodent model was utilized to investigate PCOS-related bone changes.
• The study focused on microarchitecture, mechanical strength, and bone remodeling markers.

Purpose of the Study:

• To investigate the impact of androgens on bone microarchitecture, mechanical strength, and remodeling in an androgenized rat model of PCOS.
• To assess bone changes in rats with intact ovaries (SHAM) and after oophorectomy (OVX).

Main Methods:

• Wistar rats were androgenized using testosterone propionate from days 2-5 of life.
• Androgenized rats exhibited chronic anovulation, mimicking PCOS features.
• Ovariectomy or SHAM procedures were performed on Day 100, with follow-up for 180 days.

Main Results:

• Androgenized SHAM rats showed increased trabecular bone mass but decreased cortical area and femur strength.
• Bone resorption marker (CTX) was diminished, suggesting altered bone remodeling.
• Micro-CT revealed divergence between trabecular and cortical bone profiles.

Conclusions:

• PCOS model rats experienced reduced femur strength due to decreased cortical thickness and area, despite enhanced trabecular bone.
• Ovariectomy in androgenized rats slowed cortical bone loss, preserving bone resistance and thickness compared to controls.