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Renata Gabriel Fontinele1, Valquiria Barboza Mariotti, Amanda Messias Vazzoleré
1Department of Surgery, School of Veterinary Medicine and Animal Science, University of São Paulo, Brazil. renata.fontenele@globo.com
Microscopy Research and Technique
|February 13, 2013
Summary
Ovariectomy in rats caused significant changes in tibial articular cartilage, particularly the superficial layer. However, regular aerobic exercise appeared to mitigate these estrogen-deficiency-induced effects.
Area of Science:
- Biomedical Science
- Orthopedics
- Endocrinology
Background:
- Ovariectomy leads to estrogen deficiency, impacting various tissues.
- Articular cartilage health is crucial for joint function and is susceptible to hormonal changes.
Purpose of the Study:
- To investigate the effects of ovariectomy on the articular cartilage structure of the tibial proximal epiphysis in Wistar rats.
- To determine if aerobic physical exercise influences these ovariectomy-induced cartilage alterations.
Main Methods:
- Six-month-old female Wistar rats were divided into three groups: Control (CG), Ovariectomy and Sedentary (OSG), and Ovariectomy and Trained (OTG).
- The OTG group underwent 3 months of aerobic physical activity.
- Histological sections stained with Hematoxylin and Eosin, and Picrosirius were analyzed.
Main Results:
- Ovariectomy increased articular cartilage thickness in the superficial layer in sedentary rats compared to trained rats.
- Chondrocyte nuclear volume in the superficial and medium layers, and overall epiphysial cartilage, was reduced in ovariectomized groups compared to controls.
- Volume density of collagen fibers increased in ovariectomized groups, with higher values in the trained group compared to the sedentary group.
Conclusions:
- Estrogen deficiency due to ovariectomy significantly alters tibial cartilage structure, especially the superficial layer.
- Aerobic physical exercise demonstrated a protective effect, partially alleviating the negative impacts of estrogen deficiency on articular cartilage.
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