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Intravascular pulmonary macrophages: a novel cell removes particles from blood
Ist Teil von
American journal of physiology. Regulatory, integrative and comparative physiology, 1986-04, Vol.250 (4), p.728-R732
Ort / Verlag
United States
Erscheinungsjahr
1986
Quelle
MEDLINE
Beschreibungen/Notizen
A. E. Warner and J. D. Brain
Clearance of radiolabeled gold colloid from the blood and relative organ
distribution of retained colloid and magnetic iron oxide particles were
compared between rats and calves. When unanesthetized calves 1 wk of age
were injected intravenously with these two particle types, uptake was
predominantly pulmonary. In contrast, in the rat there was overwhelming
hepatic uptake. Similar pulmonary localization of injected particulate
material was found in adult goats. When lung tissue was examined by
electron microscopy, injected iron oxide was found within intravascular
pulmonary macrophages. The mononuclear phagocyte system removes particulate
material of both exogenous and endogenous origin from the circulation;
hepatic and splenic uptake of such material usually predominates. We found
that, unlike the species previously studied, ruminants have actively
phagocytic cells within the pulmonary vasculature. Thus pulmonary
intravascular macrophages constitute an important part of the mononuclear
phagocyte system in some species.