Macrophage growth inhibitors derived from the murine peritoneal cavity |
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Authors: | Shing-Erh Yen Carleton C Stewart |
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Institution: | (1) Section of Cancer Biology, Division of Radiation Oncology, Mallinckrodt Institute of Radiology, Washington University School of Medicine, 63110 St. Louis, Missouri;(2) Division of Immunology, St. Jude Children's Research Hospital, 332 North Lauderdale, P. O. Box 318, 38101 Memphis, TN |
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Abstract: | Summary The murine peritoneal cavity contains factors that inhibit the in vitro growth and colony formation of macrophages. The inhibition
of macrophage growth is not due to cell death. In the presence of inhibitors, the growth of colony-forming macrophages is
suppressed, and small clusters are formed as a result of limited proliferation. The more mature mono-nuclear phagocytes (blood
monocytes and peritoneal exudate macrophages) are more sensitive to the overall inhibitory effect of the peritoneal inhibitors
than the less mature bone marrow mononuclear phagocytes. Furthermore, using dialysis and Amicon ultrafiltration, at least
two inhibitors with differential inhibitory effects can be demonstrated. The colony formation of bone marrow mononuclear phagocytes
is suppressed mainly by a protease-resistant, small molecular weight (<1,000) dialyzable inhibitor. In contrast, peritoneal
exudate macrophages are sensitive to both the small molecular weight inhibitor and a protease-sensitive, large molecular weight
(>12,000), nondialyzable inhibitor. The data suggest a possible existence of a dual inhibitor control on the proliferation
of mononuclear phagocytes in vivo. In addition, the in vitro cultured peritoneal exudate cells are capable of producing inhibitors
that mimic the activity of the in vivo inhibitors.
This investigation was supported by Grants CA 09 11(SY) and AI15563(CCS) from the National Institutes of Health, Bethesda,
MD |
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Keywords: | macrophage colony formation inhibitors |
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