Abstract
Human polymorphonuclear leukocytes (PMN) phagocytosing opsonized antigen-antibody complexes, produce dialyzable species of activated oxygen which are capable of partially suppressing the elastase-inhibiting capacity (EIC) of whole human serum or purified human alpha1-proteinase inhibitor. Serum EIC was partially protially protected by superoxide dismutase, catalase, or mannitol, suggesting that hydroxyl radical, formed by interaction of superoxide radical and hydrogen peroxide, might be responsible for this effect. NaN3 also partly protected EIC, implicating myeloperoxidase-mediated reactions as well. An artificial superoxide rradical-generating system, involving xanthine and xanthine-oxidase, could be substituted for phagocytosing PMN with resultant EIC suppression. These results are consistent with previous demonstrations of the release of potent oxidants by stimulated PMN, as well as earlier studies from our laboratory showing sensitivity of alpha1-proteinase inhibitor to inactivation by oxidants. Oxidative inactivation of proteinase inhibitors in the microenvironment of PMN accumulating at sites of inflammation may allow proteases released from these cells to more readily damage adjacent connective tissue structures.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- BEERS R. F., Jr, SIZER I. W. A spectrophotometric method for measuring the breakdown of hydrogen peroxide by catalase. J Biol Chem. 1952 Mar;195(1):133–140. [PubMed] [Google Scholar]
- Blondin J., Janoff A. The role of lysosomal elastase in the digestion of Escherichia coli proteins by human polymorphonuclear leukocytes: experiments with living leukocytes. J Clin Invest. 1976 Oct;58(4):971–979. doi: 10.1172/JCI108551. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Carp H., Janoff A. Possible mechanisms of emphysema in smokers. In vitro suppression of serum elastase-inhibitory capacity by fresh cigarette smoke and its prevention by antioxidants. Am Rev Respir Dis. 1978 Sep;118(3):617–621. doi: 10.1164/arrd.1978.118.3.617. [DOI] [PubMed] [Google Scholar]
- Janoff A., Scherer J. Mediators of inflammation in leukocyte lysosomes. IX. Elastinolytic activity in granules of human polymorphonuclear leukocytes. J Exp Med. 1968 Nov 1;128(5):1137–1155. doi: 10.1084/jem.128.5.1137. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Johnston R. B., Jr, Keele B. B., Jr, Misra H. P., Lehmeyer J. E., Webb L. S., Baehner R. L., RaJagopalan K. V. The role of superoxide anion generation in phagocytic bactericidal activity. Studies with normal and chronic granulomatous disease leukocytes. J Clin Invest. 1975 Jun;55(6):1357–1372. doi: 10.1172/JCI108055. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McCord J. M., Day E. D., Jr Superoxide-dependent production of hydroxyl radical catalyzed by iron-EDTA complex. FEBS Lett. 1978 Feb 1;86(1):139–142. doi: 10.1016/0014-5793(78)80116-1. [DOI] [PubMed] [Google Scholar]
- McCord J. M. Free radicals and inflammation: protection of synovial fluid by superoxide dismutase. Science. 1974 Aug 9;185(4150):529–531. doi: 10.1126/science.185.4150.529. [DOI] [PubMed] [Google Scholar]
- McCord J. M., Fridovich I. Superoxide dismutase. An enzymic function for erythrocuprein (hemocuprein). J Biol Chem. 1969 Nov 25;244(22):6049–6055. [PubMed] [Google Scholar]
- Salin M. L., McCord J. M. Free radicals and inflammation. Protection of phagocytosine leukocytes by superoxide dismutase. J Clin Invest. 1975 Nov;56(5):1319–1323. doi: 10.1172/JCI108208. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Weiss S. J., Rustagi P. K., LoBuglio A. F. Human granulocyte generation of hydroxyl radical. J Exp Med. 1978 Feb 1;147(2):316–323. doi: 10.1084/jem.147.2.316. [DOI] [PMC free article] [PubMed] [Google Scholar]