β2-Adrenergic receptor expression in subchondral bone of patients with varus knee osteoarthritis

Open Medicine

Guo Haohui¹  Wang Jian¹  Yang Xiaochun¹  Ma Long¹  Jin Qunhua¹  Zhao Xin¹  Jian Li²  Meng Zhiqiang³  Liang Xuegang³  Yang Lvlin³ 

[1] Department of Orthopedics Ward 3, The General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia, China;Department of Pathology, The General Hospital of Ningxia Medical University, Yinchuan, 750004, Ningxia, China;Department of The General Hospital of Ningxia Medical University, Ningxia Medical University, Yinchuan, 750004, Ningxia, China;

关键词: osteoarthritis;    β2-adrenergic receptor;    mechanical stresses;    subchondral bone;    bone remodeling;   

DOI  :  10.1515/med-2022-0498

来源: DOAJ

【 摘 要 】

An important causative factor in osteoarthritis (OA) is the abnormal mechanical stress-induced bone remodeling of the subchondral bone. β2-adrenergic receptor (Adrb2) plays a major role in mechanical stresses that induce bone remodeling. The medial tibial plateau (MTP) and lateral tibial plateau (LTP) of patients with varus Knee osteoarthritis (KO) bear different mechanical stresses. The present study aimed to investigate the expression of Adrb2 in medial tibial plateau subchondral bone (MTPSB) and lateral tibial plateau subchondral bone (LTPSB) in patients with varus KO. A total of 30 tibial plateau samples from patients undergoing total knee arthroplasty for varus KO and MTPSB and LTPSB were studied. Statistical analysis was performed using paired sample t-tests. Safranin O-Fast Green staining and Micro-computed tomography showed significant differences in the bone structure between MTPSB and LTPSB. Tartrate-resistant acid phosphatase (TRAP)-positive cell density in MTPSB was higher than that in LTPSB. Immunohistochemistry, reverse transcription-quantitative polymerase chain reaction, and Western blot analysis revealed that compared to LTPSB, the levels of Adrb2, tyrosine hydroxylase (TH), and osteocalcin increased significantly in MTPSB. Double-labeling immunofluorescence showed Adrb2 was present in the majority of TRAP-positive multinuclear cells of the MTPSB. The expression of Adrb2 and TH was significantly higher in MTPSB than in LTPSB, confirming the involvement of these molecules in the development of OA.

【 授权许可】

Unknown