Aerosolized lipopolysaccharide increases pulmonary clearance of 99mTc- DTPA in rabbits

M. A. Brown, R. C. Lantz, R. Sobonya, L. C. Devine, L. A. Lentz, R. J. Lemen

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Bacterial endotoxins alter the permeability of endothelium, but little is known of their effect on epithelium. We exposed specific pathogen-free rabbits to aerosolized Pseudomonas aeruginosa LPS or saline and performed serial measurements of RL, Cdyn, BP, WBC count and differential, and platelet counts. Pulmonary 99mTc-DTPA half-life was measured 4, 6, or 8 h after exposure. The animals were sacrificed and BAL performed. Background and PMA- stimulated superoxide production was measured from individual AM using electrooptical determination of reduction of NBT. Lung tissue was processed for light microscopy and ratio of wet to dry weight. 99mTc-DTPA half-life was significantly shorter in LPS-exposed animals at 6 h (p < 0.05) and 8 h (p < 0.001). There were no differences in Cdyn, RL, BP, WBC, differential, platelet, or BAL cell count at any time between groups. No histologic changes or differences in lung wet to dry weight ratios were found. PMA-stimulated AM superoxide production was significantly increased (p < 0.01) in LPS-exposed animals. This effect was time dependent and could be duplicated in AM from control animals following a 4-h incubation with LPS, lavage fluid from LPS- exposed animals, or recombinant murine TNF. These results demonstrate that aerosolized Pseudomonas LPS increases pulmonary epithelial permeability and primes AM superoxide production.

Original languageEnglish (US)
Pages (from-to)1462-1468
Number of pages7
JournalAmerican Review of Respiratory Disease
Volume146
Issue number6
DOIs
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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