Sequential Epiphyseal Cartilage Changes of Femoral Heads in C57BL/6 Female Mice Treated with Excessive Glucocorticoids.

Abstract:

OBJECTIVE:Excessive use of glucocorticoids (GCs) may cause adverse effects on the skeletal system in children. However, only a few studies have reported the effects of GCs on the epiphyseal cartilage. This study aimed to uncover the subsequent epiphyseal cartilage changes of immature femoral heads after excessive GC treatment in a mouse model and explain the pathological changes preliminarily. DESIGN:Female C57BL/6 mice were divided into control and model (excessive GC treatment) groups. The structure of the femoral heads was evaluated by using micro-computed tomography, hematoxylin-eosin staining, and safranin staining analyses. Immunohistochemistry was used to detect angiogenesis and cartilage metabolism. Western blotting and TUNEL staining were used to examine epiphyseal cartilage chondrocyte apoptosis. Primary chondrocytes were isolated from the femoral heads of healthy mice for in vitro studies. The effects of GCs on chondrocyte apoptosis and metabolism were determined by flow cytometry and Western blotting. RESULTS:The epiphyseal cartilage ossification had started at 4 weeks posttreatment in a portion of mice; the ossification presented as a sequential process in the model group, while the epiphyseal cartilage maintained an unossified state in the control group. Vascular invasion into the epiphyseal cartilage of the model mice was observed at 4 weeks posttreatment. GCs induced chondrocyte apoptosis and altered chondrocyte metabolism in the epiphyseal cartilage. CONCLUSIONS:The epiphyseal cartilage ossification accelerated in the femoral heads of female C57BL/6 mice after excessive GC treatment. Increased chondrocyte apoptosis, altered chondrocyte metabolism, as well as increased vascular invasion, are the potential factors influencing epiphyseal cartilage ossification.

journal_name

Cartilage

journal_title

Cartilage

authors

Jin S,Yang L,Meng C,He Y,Ma K,Huang W,Wang H

doi

10.1177/1947603520978574

subject

Has Abstract

pub_date

2020-12-03 00:00:00

pages

1947603520978574

eissn

1947-6035

issn

1947-6043

pub_type

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