Aberrant upregulation of CaSR promotes pathological new bone formation in ankylosing spondylitis.
Xiang LiSiwen ChenZaiying HuDongying ChenJianru WangZemin LiZihao LiHaowen CuiGuo DaiLei LiuHaitao WangKuibo ZhangZhaomin ZhengZhongping ZhanHui LiuPublished in: EMBO molecular medicine (2020)
Pathological new bone formation is a typical pathological feature in ankylosing spondylitis (AS), and the underlying molecular mechanism remains elusive. Previous studies have shown that the calcium-sensing receptor (CaSR) is critical for osteogenic differentiation while also being highly involved in many inflammatory diseases. However, whether it plays a role in pathological new bone formation of AS has not been reported. Here, we report the first piece of evidence that expression of CaSR is aberrantly upregulated in entheseal tissues collected from AS patients and animal models with different hypothetical types of pathogenesis. Systemic inhibition of CaSR reduced the incidence of pathological new bone formation and the severity of the ankylosing phenotype in animal models. Activation of PLCγ signalling by CaSR promoted bone formation both in vitro and in vivo. In addition, various inflammatory cytokines induced upregulation of CaSR through NF-κB/p65 and JAK/Stat3 pathways in osteoblasts. These novel findings suggest that inflammation-induced aberrant upregulation of CaSR and activation of CaSR-PLCγ signalling in osteoblasts act as mediators of inflammation, affecting pathological new bone formation in AS.
Keyphrases
- ankylosing spondylitis
- poor prognosis
- oxidative stress
- signaling pathway
- rheumatoid arthritis
- diabetic rats
- cell proliferation
- end stage renal disease
- mesenchymal stem cells
- machine learning
- newly diagnosed
- high glucose
- bone marrow
- gene expression
- immune response
- binding protein
- peritoneal dialysis
- pi k akt
- patient reported outcomes
- endothelial cells
- nuclear factor