Macrophages activated by fibrin increase albumin permeability across pulmonary artery endothelial monolayers

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Am. Rev. Respir. Dis.; (United States)

DOI:https://doi.org/10.1164/ajrccm/139.4.940· OSTI ID:6102217

Ferro, T J; Lynch, J J; Malik, A B

We have examined the effects of alveolar macrophages (AM) obtained after challenge with alpha-thrombin on 125I-labeled albumin permeability across ovine pulmonary artery endothelial monolayers. AM were obtained by bronchoalveolar lavage before and after challenging the sheep with alpha-thrombin (80 U/kg). Post-thrombin AM increased 125I-labeled albumin transendothelial permeability, whereas resting AM had no effect (82.7 +/- 7.9% increase versus 17.2 +/- 1.6% increase at the AM:endothelial cell ratio of 1:1; p less than 0.001). The permeability increase was also seen at AM:endothelial cell ratios of 0.2:1 and 5:1. Endothelial permeability to 125I-labeled albumin did not increase after in vitro incubation of macrophages with 10(-8) M thrombin, suggesting that AM are activated as a result of thrombin-induced fibrin microembolism rather than by the alpha-thrombin per se. The increase in permeability was not due to endothelial lysis since macrophages did not cause release of endothelial lactate dehydrogenase. Adherence of AM to the endothelium did not correlate with the ability of AM to increase endothelial permeability. Superoxide anion production was increased when post-thrombin AM were exposed to the endothelial monolayers (30.6 +/- 4.2 nmol/10(6) cells/10 min) compared with production by post-thrombin AM in the absence of endothelial cells (2.5 +/- 0.5 nmol/10(6) cells/10 min). The addition of superoxide dismutase (SOD) blunted the permeability increase induced by AM (32.3 +/- 3.9% increase with SOD versus 84.1 +/- 7.1% increase without SOD; p less than 0.001), indicating that superoxide anion is an important mediator of the macrophage-induced increase in endothelial monolayer permeability.

• Research Organization: Albany Medical College of Union Univ., NY (USA)
• OSTI ID: 6102217
• Journal Information: Am. Rev. Respir. Dis.; (United States), Journal Name: Am. Rev. Respir. Dis.; (United States) Vol. 139:4; ISSN ARDSB
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALBUMINS
ANIMAL CELLS
ANIMAL TISSUES
ANIMALS
ARTERIES
BETA DECAY RADIOISOTOPES
BIOLOGICAL FUNCTIONS
BLOOD VESSELS
BODY
CARDIOVASCULAR SYSTEM
COAGULANTS
CONNECTIVE TISSUE CELLS
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
ENDOTHELIUM
ENZYMES
FIBRIN
FUNCTIONS
HEMATOLOGIC AGENTS
HEMOSTATICS
HYDROLASES
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LAVAGE
MACROPHAGES
MAMMALS
MEMBRANE TRANSPORT
METABOLISM
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
OXIDOREDUCTASES
PEPTIDE HYDROLASES
PERMEABILITY
PHAGOCYTES
PROTEINS
RADIOISOTOPES
RUMINANTS
SCLEROPROTEINS
SERINE PROTEINASES
SHEEP
SOMATIC CELLS
SUPEROXIDE DISMUTASE
THROMBIN
TISSUES
TRACER TECHNIQUES
VERTEBRATES