A comparative study of localization of heat shock protein 27 and heat shock protein 72 in the developmental and degenerative intervertebral discs.

STUDY DESIGN: The lumbar intervertebral discs of 135 subjects after autopsy were immunostained with antihuman heat shock protein 27 (HSP27) monoclonal antibody and antihuman heat shock protein 72 (HSP72) polyclonal antibody. OBJECTIVES: To present the data on metabolic changes that occurred in the chondrocytes of intervertebral discs during development and aging. SUMMARY OF BACKGROUND DATA: Heat shock proteins have been implicated in the progressive degeneration of articular cartilage in joint disease, such as rheumatoid arthritis and osteoarthritis. However, the role and expression of heat shock proteins in human intervertebral discs have received little study. METHODS: One hundred thirty-five specimens of human intervertebral discs were stained with hematoxylin and eosin, alcian blue, and Masson's trichrome and were immunostained with HSP27 and HSP72 by an indirect immunoperoxidase method. The relative amounts of HSP27 and HSP72 deposition were graded according to a semiquantitative scoring system. RESULTS: Heat shock protein 72 accumulated in the cytoplasm of the chondrocytes of both endplate cartilage and nucleus pulposus during gestation and thereafter decreased with aging (age,