Abstract
Immunization of BALB/c mice with chondroitin sulfate-depleted proteoglycan (aggrecan) of fetal human cartilage produces progressive polyarthritis and ankylosing spondylitis. The development of the disease in genetically susceptible BALB/c mice is dependent upon the expression of both cell-mediated and humoral immune responses against the host mouse cartilage proteoglycan (PG). Although cartilage PGs from various species have many biochemical and immunological similarities, only a select group of PGs from fetal and newborn human, fetal pig and canine articular cartilages, human osteophytes and human chondrosarcomas are able to induce arthritis in BALB/c mice. Arthritis develops only in mice that also develop autoantibodies to self-cartilage PGs, although autoantibodies occasionally are present in non-arthritic animals as well. The protease-sensitive auto/arthritogenic epitope(s) is located in, or close to, the chondroitin sulfate (CS) attachment region of the PG molecule. The primary structure of the core protein is responsible for the autoimmune/arthritogenic effect of this select group of PGs, whereas the core protein epitopes are masked by glycosaminoglycan (GAG)-side chains. The CS side chains seem to inhibit antigen recogni...Continue Reading
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