title: Secretory leucocyte proteinase inhibitor is produced by human articular cartilage chondrocytes and intervertebral disc fibrochondrocytes.
abstract: The objective of this study was to examine the expression of the secretory leucocyte proteinase inhibitor (SLPI) gene by human articular cartilage chondrocytes and intervertebral disc fibrochondrocytes. RNA was extracted from human articular cartilage chondrocytes, synovial fibroblasts and fibrochondrocytes of the annulus fibrosus. Expression was analysed by Northern blotting and hybridisation to a SLPI RNA probe. SLPI was isolated from chondrocyte culture supernatant by gel-permeation and cation-exchange chromatography and examined by a solid-phase enzyme-linked immunofiltration assay for SLPI and by SDS/PAGE using Western blotting with polyclonal IgG samples against bronchial mucus leucocyte proteinase inhibitor and SLPI. This identified biochemically and immunologically the major serine proteinase inhibitory protein synthesised by chondrocytes as SLPI. Secretory leucocyte proteinase inhibitor mRNA was detected in RNA preparations from articular cartilage chondrocytes and annulus fibrosus fibrochondrocytes. The results presented here allowed us to deduce that human articular cartilage chondrocytes and intervertebral disc fibrochondrocytes synthesized SLPI whereas human synovial fibroblasts did not.
authors.affiliation: Raymond Purves Bone and Joint Research Laboratories, University of Sydney, Royal North Shore Hospital, Australia.
authors.forename: A S
authors.initials: AS
authors.lastname: Jacoby
authors.forename: J
authors.initials: J
authors.lastname: Melrose
authors.forename: B G
authors.initials: BG
authors.lastname: Robinson
authors.forename: V J
authors.initials: VJ
authors.lastname: Hyland
authors.forename: P
authors.initials: P
authors.lastname: Ghosh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015152:Blotting, Northern; D015153:Blotting, Western; D002358:Cartilage, Articular / Q000166:cytology / Q000378:metabolism*; D002478:Cells, Cultured; D002648:Child; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D005355:Fibrosis / Q000473:pathology; D015870:Gene Expression; D006801:Humans; D007403:Intervertebral Disc / Q000166:cytology / Q000378:metabolism*; D008875:Middle Aged; D053491:Proteinase Inhibitory Proteins, Secretory; D011506:Proteins; D012333:RNA, Messenger / Q000378:metabolism; D016914:Ribonuclease H / Q000737:chemistry; D053481:Secretory Leukocyte Peptidase Inhibitor; D015842:Serine Proteinase Inhibitors / Q000096:biosynthesis* / Q000235:genetics; D013582:Synovial Fluid / Q000166:cytology
chemical_list: D053491:Proteinase Inhibitory Proteins, Secretory; D011506:Proteins; D012333:RNA, Messenger; C506814:SLPI protein, human; D053481:Secretory Leukocyte Peptidase Inhibitor; D015842:Serine Proteinase Inhibitors; D016914:Ribonuclease H