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Immunological characterization of pulmonary intravascular macrophagesPulmonary intravascular macrophages (PIMs) are lung macrophages found apposed to the endothelium of pulmonary capillaries. In many species, they are responsible for the clearance of blood-borne particulates and pathogens; however, little else is known about their roles as immunologic effector cells. We compared PIMs with pulmonary alveolar macrophages (PAMs) to determine the relative immunological activities of these two cell populations. Our results suggested that both populations possess similar phagocytic and bactericidal activities. In assays measuring cytotoxicity, PIMs were more cytotoxic than PAMs against virally infected target cells; however, differences between these macrophage populations were not as marked when noninfected targets were used. LPS-stimulated PIMs produced more T-cell proliferative cytokines than PAMs, and both populations of nonstimulated macrophages produced similar amounts of the cytokines. In contrast, PAMs produced more TNF alpha and NO2- than PIMs when both populations were stimulated with LPS; however, nonstimulated PAMs and PIMs produced similar amounts of TNF alpha and NO2. These data suggest that bovine PIMs are immunologically active. Differences between the degrees of activity of PIMs and PAMs indicate that these macrophage populations may have different roles in lung surveillance.
Document ID
20050000654
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chitko-McKown, C. G.
(Kansas State University Manhattan 66056)
Reddy, D. N.
Chapes, S. K.
McKown, R. D.
Blecha, F.
Spooner, B. S.
Date Acquired
August 22, 2013
Publication Date
July 1, 1992
Publication Information
Publication: Regional immunology
Volume: 4
Issue: 4
ISSN: 0896-0623
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cell Biology
Non-NASA Center

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