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. 1988 Sep;95(1):169–176. doi: 10.1111/j.1476-5381.1988.tb16561.x

Leucocyte infiltration and cartilage proteoglycan loss in immune arthritis in the rabbit.

E R Pettipher 1, B Henderson 1, S Moncada 1, G A Higgs 1
PMCID: PMC1854153  PMID: 3265341

Abstract

1. The relationship between phagocytic leucocyte infiltration and cartilage degradation in immune arthritis has been investigated in groups of normal and neutropenic rabbits. 2. Injection of antigen into the knee joints of sensitized control animals induced joint swelling, prostaglandin E2 (PGE2) synthesis, leucocyte accumulation and proteoglycan loss from articular cartilage. 3. Intravenous injection of nitrogen mustard caused a selective depletion of circulating neutrophils and monocytes with little or no effect on platelets or lymphocytes. In neutropenic animals challenged with antigen, there was virtually no joint swelling, PGE2 synthesis or leucocyte infiltration but cartilage proteoglycan loss was unchanged after 1 day and increased by day 4 compared to control animals. 4. The numbers of circulating leucocytes returned to normal 3-4 days after nitrogen mustard treatment and leucocyte infiltration occurred in antigen-challenged joints but this was not accompanied by joint swelling. Subsequent intra-articular injection of PGE2 did, however, cause swelling. 5. Lysosomal enzyme levels in arthritic joint fluids were measured. The levels of beta-glucuronidase, which is released by activated phagocytes, were decreased in neutropenic animals but the levels of N-acetyl-beta-glucosaminidase, which is a marker of tissue damage, were not changed by neutrophil depletion. 6. Intra-articular injections of the cytokine interleukin-1 (IL-1) induced a pattern of leucocyte infiltration and cartilage proteoglycan loss similar to that seen in immune arthritis. In neutropenic animals, IL-1 did not cause significant accumulation of leucocytes in the joint but the loss of proteoglycan from cartilage was unimpaired.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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