Key result
Disease-causing PRG4 mutations lead to undetectable synovial lubricin and prevent essential proprotein convertase cleavage.
Why the study?
The consequences of disease-causing PRG4 mutations on lubricin protein synthesis, secretion, and post-translational processing were not fully understood.
Population
Wild-type synovial fluid and cultured synoviocytes; synovial fluid and cultured synoviocytes from patients with PRG4 mutations; COS-7 cells
Comparison
Disease-causing PRG4 mutations (frameshift, nonsense, deletion of last 8 amino acids) vs wild-type PRG4/lubricin
Design
Preclinical study using polyclonal antibodies and cell expression systems
Authors
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May refine CACP diagnosis; animal data extends molecular insights but leaves therapeutic translation open.
Disease-causing mutations in PRG4 disrupt lubricin synthesis and essential post-translational SPC-mediated cleavage, elucidating the molecular basis of camptodactyly-arthropathy-coxa vara-pericarditis syndrome.
Rhee et al. (2005) studied camptodactyly-arthropathy-coxa vara-pericarditis syndrome. PRG4 mutations vs. Wild-type lubricin was evaluated on Lubricin protein synthesis, secretion, and post-translational processing. Disease-causing PRG4 mutations resulted in undetectable lubricin in patient synovial fluid and prevented essential subtilisin-like proprotein convertase-mediated cleavage in the hemopexin-like domain.
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