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Tibia bone properties at different time course of ovariectomized rats.

Zairin Noor¹, Nia Kania², Bambang Setiawan³

¹Research Center for Osteoporosis, Department of Orthopaedic and Traumatology, Ulin General Hospital, Medical Faculty, Lambung Mangkurat University, Jl. A. Yani Km 2 No.43, Banjarmasin, South Kalimantan Indonesia.

Journal of Diabetes and Metabolic Disorders

|October 16, 2014

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Ovariectomy in rats decreased bone turnover markers and altered bone structure, but did not change bone mineral elements. This study offers insights into postmenopausal bone loss mechanisms.

Area of Science:

Bone Biology and Disease
Endocrinology
Biomaterials Science

Background:

The ovariectomized rat model simulates postmenopausal osteoporosis, characterized by estrogen deficiency and accelerated bone loss.
Human studies suggest hypermineralization and increased calcium in hydroxyapatite crystals in osteoporosis patients.
This research investigates the temporal effects of ovariectomy on bone turnover, mineral composition, crystal structure, and microarchitecture.

Purpose of the Study:

To examine the impact of ovariectomy on tibia bone turnover markers over time.
To analyze changes in bone mineral elements, hydroxyapatite crystal structure, mesostructure, and histomorphometry following ovariectomy.
To understand the time-course effects of estrogen deficiency on bone health in a rat model.

Main Methods:

Keywords:

Osteoblast Osteoclast Osteoporosis Trabecular Turn over

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Ovariectomy was performed on Wistar female rats, with groups followed for one and two months.
Serum osteocalcin (OC) and C-telopeptide of type I collagen (CTX) were quantified using ELISA.
Bone mineral elements, hydroxyapatite crystal structure, and mesostructure were analyzed using X-Ray Fluorescence, X-Ray Diffraction, and Scanning Electron Microscopy, respectively.
Histomorphometry was performed using BoneJ software, with statistical analysis by ANOVA.

Main Results:

Serum OC and CTX levels significantly decreased one and two months post-ovariectomy compared to controls.
Bone mineral elements (Ca, P, Fe, Cu, Zn, Ni) and their ratios remained unchanged.
Significant alterations were observed in hydroxyapatite crystal structure and tibia bone mesostructure, including reduced trabecular volume and number, and increased thickness and spacing.
Histomorphometric analysis revealed significant decreases in trabecular bone volume and number, with increased thickness and spacing post-ovariectomy.

Conclusions:

Ovariectomy in rats leads to decreased serum osteocalcin within two months, without affecting bone mineral elements.
Significant changes in hydroxyapatite crystal lattice parameters and trabecular bone properties indicate altered bone quality.
The findings highlight structural changes in bone rather than mineral content alterations as key effects of ovariectomy-induced bone loss.