Laboratory Medicine ›› 2025, Vol. 40 ›› Issue (10): 933-940.DOI: 10.3969/j.issn.1673-8640.2025.10.001

    Next Articles

Changes in cathepsin C expression in peripheral blood monocyte subsets of RA patients

LUO Jing, YUAN Jiayi, YAO Xiaoyan, FAN Lieying()   

  1. Department of Clinical LaboratoryShanghai East Hospital,Tongji UniversityShanghai 200120, China
  • Received:2025-03-21 Revised:2025-04-21 Online:2025-10-30 Published:2025-11-07

Abstract:

Objective To investigate the relationship between cathepsin C(CTSC) expression in peripheral blood monocytes of patients with rheumatoid arthritis(RA) and RA. Methods A total of 78 RA patients(RA group),40 osteoarthritis(OA) patients(OA group),38 gout patients(gout group),33 systemic lupus erythematosus(SLE) patients(SLE group),34 Sjögren's syndrome(SS) patients(SS group),35 ankylosing spondylitis(AS) patients(AS group),9 psoriatic arthritis(PsA) patients(PsA group) and 42 healthy subjects(healthy control group) were enrolled from May 2023 to August 2024 at Shanghai East Hospital of Tongji University. The clinical data,including age,gender,rheumatoid factor(RF) and anti-cyclic citrullinated peptide(CCP) antibody determination results,were collected. Flow cytometry was used to determine the expression of CTSC in different cells of peripheral blood in 30 healthy subjects,37 RA patients,21 OA patients and 25 gout patients. Enzyme-linked immunosorbent assay(ELISA) was used to determine serum CTSC levels and the CTSC levels in the synovial fluid of 3 RA patients and 3 OA patients. Results The expression of CTSC in peripheral blood monocytes of RA patients was higher than that in neutrophils and lymphocytes(P<0.05). The expression of CTSC in monocytes of RA group was higher than those in healthy control group,gout group and OA group(P<0.05). In RA group,OA group,gout group and healthy control group,the expression of CTSC in intermediate monocytes(IM) and non-classical monocytes(NCM) was higher than that in classical monocytes(CM)(P<0.05),while there was no statistical significance between IM and NCM(P>0.05). The expression of CTSC in CM,IM and NCM of RA patients was higher than those in OA group,gout group and healthy control group(P<0.05). The CTSC levels in the synovial fluid of 3 RA patients(167,106 and 215 ng·mL-1) were higher than those of 3 OA patients(28,53 and 6 ng·mL-1). The serum CTSC level of RA group was higher than those of OA group,SLE group,AS group and healthy control group(P<0.05). Conclusions CTSC is highly expressed in pro-inflammatory monocytes of RA patients,and it may play a role in the pathogenesis of RA.

Key words: Cathepsin C, Rheumatoid factor, Rheumatoid arthritis, Monocyte, Subset, Diagnosis

CLC Number: