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Epithelioid macrophages secrete a deactivating factor for superoxide release
Author(s) -
Camarero Valeria C. P. C.,
Junqueira Virginia B.,
Colepicolo Pio,
Karnovsky Manfred L.,
Mariano Mario
Publication year - 1990
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041450313
Subject(s) - superoxide , phorbol , in vitro , chemistry , giant cell , population , microbiology and biotechnology , secretion , epithelioid cell , liberation , biology , biochemistry , immunology , pathology , medicine , protein kinase c , enzyme , immunohistochemistry , environmental health
The release of superoxide anion (O 2 − ) by inflammatory macrophages, multinucleated giant cells, and epithelioid cells, obtained by the insertion of round glass coverslips into the subcutaneous tissue of mice, was investigated. O 2 −was shown to be spontaneously released by cells on the surface of glass coverslips implanted up to 7 days but not by cells obtained 14 or 21 days after coverslip implantation. The formel showed increased O 2 −release when stimulated by phorbol myristate acetate, whereas cells harvested after 14 or 21 days implantation did not. The induction of delayed type hypersensitivity around coverslips implanted for 5 days increased spontaneous O 2 −release by these cells by 40%. On the other hand, when the same protocol was used with coverslips implanted for 14 days, O 2 −release was not detected. These results were viewed in regard to the composition of the cell population at each time point. When coverslips were removed after 14 days of implantation and the cells incubated for 30 minutes in vitro, the medium so conditioned inhibited O 2 −release by cells of 5 day old preparations. This indicates the release by cells on the longer term coverslips of a substance that inhibits O 2 −production by cells of coverslips implanted for 5 days only. This inhibitory activity could be suppressed by treating the conditioned medium with proteases. The factor was, however, heat stable and exerted its effects even when the test cells were exposed to phorbol myristate acetate.