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Expression of caspase-1 in synovial membrane-like interface tissue around loosened hip prostheses

T F Li1, J Mandelin, M V J Hukkanen

  • 1ORTON Research Institute, the Orthopaedic Hospital of the Invalid Foundation, Helsinki, Finland.

Rheumatology International
|July 12, 2002
PubMed

Insights

Increased caspase-1 (an enzyme) synthesis in tissue around loose hip implants may drive inflammation and bone loss by activating interleukin-1 beta (IL-1beta). This suggests a role for caspase-1 in implant loosening.

Area of Science:

  • Biomedical Engineering
  • Immunology
  • Orthopedics

Background:

  • Implant loosening is a major complication of hip arthroplasty.
  • The role of inflammatory mediators in implant loosening is not fully understood.

Purpose of the Study:

  • To investigate the expression and localization of caspase-1 in synovial membrane-like interface tissue (SMLIT) from loosened hip prostheses.
  • To compare caspase-1 expression in SMLIT with osteoarthritic synovial tissue.

Main Methods:

  • Quantitative analysis of caspase-1 mRNA.
  • Immunohistochemical detection of precursor and active caspase-1 proteins.
  • Double-labeling for caspase-1 with cell markers (macrophages, fibroblasts) and cytokines (IL-1beta, IL-18).

Main Results:

  • Caspase-1 mRNA and protein were detected in both SMLIT and synovial tissue.
  • Higher numbers of caspase-1-positive cells, primarily macrophages and fibroblasts, were found in SMLIT.
  • Increased co-localization of active caspase-1 with IL-1beta was observed in SMLIT.

Conclusions:

  • Caspase-1 synthesis is upregulated in SMLIT associated with loosened hip prostheses.
  • Caspase-1 may contribute to implant loosening by processing IL-1beta, a key factor in osteoclast activation and inflammation.

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