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Published in: BMC Musculoskeletal Disorders 1/2014

Open Access 01-12-2014 | Research article

Immune response associated with Toll-like receptor 4 signaling pathway leads to steroid-induced femoral head osteonecrosis

Authors: Lei Tian, Qi Wen, Xiaoqian Dang, Wulin You, Lihong Fan, Kunzheng Wang

Published in: BMC Musculoskeletal Disorders | Issue 1/2014

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Abstract

Background

Femoral head osteonecrosis is frequently observed in patients treated with excessive corticosteroids. The objective of the current study was to establish a rat model to investigate the disruption of immune response in steroid-induced femoral head osteonecrosis via Toll-like receptor 4 (TLR4) signaling pathway.

Methods

Male SD rats were divided into the treatment group (group A) and the model group (group B) consisting of 24 rats each, and were injected intramuscularly with 20 mg/kg methylprednisolone (MP) for 8 weeks, once a week. The rats in group A were injected intravenously with 7.5 mg/kg TAK242 before each MP administration. A control group (group N) consisted of 12 rats were received saline injection. All animals were sacrificed 8, 10 and 12 weeks from the first MP injection, respectively. Histopathological analysis was performed and the concentration of tartrate-resistant acid phosphatase (TRAP) in serum was tested. The signaling molecules including TLR4, MyD88, NF-κB p65 and MCP-1 were detected by immunohistochemistry, quantitative real-time PCR and Western blot.

Results

Femoral head osteonecrosis was observed in the model rats, and the concentration of TRAP and positive staining of all signaling molecules increased significantly in group B compared with that in group A and group N. Compare with the control group, the mRNA expressions and protein levels of all signaling molecules were enhanced significantly in group B, but no significant in group A.

Conclusions

Corticosteroids can induce femoral head osteonecrosis by disturbing the immune response via TLR4 signaling pathway. These findings suggest that the disruption of immune response play a role in the pathogenesis of osteonecrosis.
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Metadata
Title
Immune response associated with Toll-like receptor 4 signaling pathway leads to steroid-induced femoral head osteonecrosis
Authors
Lei Tian
Qi Wen
Xiaoqian Dang
Wulin You
Lihong Fan
Kunzheng Wang
Publication date
01-12-2014
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2014
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-15-18

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