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J Biol Chem, Vol. 274, Issue 25, 18075-18080, June 18, 1999
From the Department of Medicine, University of Iowa College of
Medicine and Veterans Affairs Medical Center,
Iowa City, Iowa 52242
Although many functions of human alveolar
macrophages are altered compared with their precursor cell, the blood
monocyte (monocyte), the reason(s) for these functional changes have
not been determined. We recently reported that human alveolar
macrophages do not express AP-1 DNA binding activity (Monick, M. M., Carter, A. B., Gudmundsson, G., Geist, L. J., and
Hunninghake, G. W. (1998) Am. J. Physiol. 275, L389
Human Alveolar Macrophages Are Markedly Deficient in REF-1
and AP-1 DNA Binding Activity
L397). To determine why alveolar macrophages do not express AP-1
DNA binding activity, we first showed that there was not a decrease in
expression of the FOS and JUN proteins that make up the AP-1 complex.
There was, however, a significant difference in the amounts of the
nuclear protein, REF-1 (which regulates AP-1 DNA binding by altering
the redox status of FOS and JUN proteins), in alveolar macrophages
compared with monocytes. In addition, in vitro
differentiation of monocytes to a macrophage-like cell resulted in
decreased amounts of REF-1. Finally, addition of REF-1 from activated
monocytes to alveolar macrophage nuclear proteins resulted in a marked
increase in AP-1 DNA binding. These studies strongly suggest that the
process of differentiation of monocytes into alveolar macrophages is
associated with a loss of REF-1 and AP-1 activity. This observation may
explain, in part, some of the functional differences observed for
alveolar macrophages compared with monocytes.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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