title: Comparison of the acute inflammation induced by calcium pyrophosphate dihydrate, apatite and mixed crystals in the rat air pouch model of a synovial space.
abstract: Pure monoclinic or triclinic calcium pyrophosphate dihydrate (CPPD) crystals, apatite crystals or mixtures of these crystals were injected into the synovial-like space created by the rat air pouch to compare the acute inflammation induced by these crystals. Fluids were withdrawn 6 h after injection and examined for leukocyte counts, protease, prostaglandin E2 (PGE2) and tumor necrosis factor (TNF) levels. CPPD crystals (especially monoclinic CPPD) induced higher numbers of leukocytes, and more protease, PGE2 and TNF than apatite. CPPD seemed to play a predominant role in the acute inflammation induced by mixed crystals.
authors.affiliation: University of Pennsylvania School of Medicine, Philadelphia.
authors.forename: W
authors.initials: W
authors.lastname: Watanabe
authors.forename: D G
authors.initials: DG
authors.lastname: Baker
authors.forename: H R
authors.initials: HR
authors.lastname: Schumacher
mesh_terms: D000818:Animals; D001031:Apatites / Q000009:adverse effects*; D002131:Calcium Pyrophosphate / Q000009:adverse effects*; D003460:Crystallization; D015232:Dinoprostone / Q000032:analysis; D004195:Disease Models, Animal; D010450:Endopeptidases / Q000378:metabolism; D007958:Leukocyte Count; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012867:Skin / Q000187:drug effects* / Q000473:pathology; D013582:Synovial Fluid / Q000737:chemistry; D013583:Synovial Membrane / Q000187:drug effects* / Q000473:pathology; D013585:Synovitis / Q000139:chemically induced* / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
chemical_list: D001031:Apatites; D014409:Tumor Necrosis Factor-alpha; D010450:Endopeptidases; D015232:Dinoprostone; D002131:Calcium Pyrophosphate