1. Cartilage degradation by stimulated human neutrophils: reactive oxygen species decrease markedly the activity of proteolytic enzymes
- Author
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Jürgen Schiller, Klaus Arnold, Stefan Benard, Jürgen Arnhold, and Sabine Reichl
- Subjects
Cartilage, Articular ,Proteases ,Magnetic Resonance Spectroscopy ,Cytochalasin B ,Neutrophils ,Swine ,Polymorphonuclear leukocytes ,Clinical Biochemistry ,Stimulation ,In Vitro Techniques ,Biology ,Biochemistry ,Neutrophil Activation ,Arthritis, Rheumatoid ,Onium Compounds ,NMR spectroscopy ,Endopeptidases ,Drug Discovery ,medicine ,Animals ,Humans ,Molecular Biology ,Pharmacology ,chemistry.chemical_classification ,Reactive oxygen species ,Effector ,Cartilage ,Biphenyl Compounds ,MALDI-TOF mass spectrometry ,Proteolytic enzymes ,General Medicine ,N-Formylmethionine Leucyl-Phenylalanine ,Enzyme ,medicine.anatomical_structure ,chemistry ,Culture Media, Conditioned ,Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ,Luminescent Measurements ,Tetradecanoylphorbol Acetate ,Molecular Medicine ,Degradation (geology) ,Proteoglycans ,Cartilage degradation - Abstract
Background: Although neutrophilic granulocytes clearly contribute to cartilage degradation in rheumatic diseases, it is unclear if reactive oxygen species (ROS) or proteolytic enzymes are the most important components in cartilage degradation and how they interact. Results: Neutrophils were stimulated by chemicals conferring a different degree of ROS formation and enzyme release. Supernatants of neutrophils were incubated with thin slices of pig articular cartilage. Supernatants of cartilage were assayed by NMR spectroscopy, MALDI-TOF mass spectrometry and relevant biochemical methods. Stimulation conditions of neutrophils correlated well with the extent of cartilage degradation. Due to the release of different enzymes, cartilage degradation could be best monitored by NMR since mainly low-mass degradation products were formed. Astonishingly, the suppression of the formation of ROS resulted in decreased cartilage degradation. Conclusion: ROS formed by neutrophils are not directly involved in cartilage degradation but influence the activity of proteolytic enzymes, which are the main effectors of cartilage degradation.
- Published
- 2000
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