Abstract:
:This study examined the hypothesis that tumor cells metastatic to the pleura secrete a soluble factor(s) that directly increases endothelial cell permeability. Nitrocellulose filters were endothelialized with bovine pulmonary artery endothelial cells and exposed to conditioned media from either human lung adenocarcinoma (Calu-3), human lung squamous cell carcinoma (SK-MES-1), or control media for 16 h. The diffusional permeability (Pd x 10(-5) cm/sec) to [14C]albumin was then determined for each monolayer with Ussing-type chambers. Both adenocarcinoma conditioned media (ACCM) and squamous cell carcinoma conditioned media (SCCM) caused a two- to threefold increase in endothelial monolayer permeability. The addition of indomethacin (10 micrograms/ml) blocked the observed permeability increase in ACCM but not in SCCM, suggesting that the increase in permeability by ACCM was secondary to the production of prostaglandins. To confirm this, a variety of prostanoids previously shown to be produced by the Calu-3 cell line were added directly to the endothelial monolayer. Prostaglandin F2 alpha (PGF2 alpha) in both low (10 ng/ml) and high (100 ng/ml) concentrations for 16 h resulted in a three- to fourfold increase in permeability. Prostaglandin E2 (PGE2) resulted in a small increase in [14C]albumin permeability but only at high concentrations (100 ng/ml). PGF2 alpha production by the two tumor cell lines was measured using radioimmunoassay. Baseline adenocarcinoma production of PGF2 alpha was 117.5 pmol/10(6) cells and fell to 24.2 pmol/10(6) cells hours following incubation with indomethacin. The decrease in PGF2 alpha occurred in parallel with the changes in permeability. Concomitant, reversible changes in cell shape and F-actin distribution were detected in endothelial cells exposed to ACCM. No significant production of PGF2 alpha by the squamous cell carcinoma cell line was detected. These results suggest that both adenocarcinoma and squamous cell carcinoma secrete a soluble factor(s) that directly increases endothelial cell permeability to albumin and that in the case of adenocarcinoma this soluble factor may be a prostanoid such as PGF2 alpha.
journal_name
Inflammationjournal_title
Inflammationauthors
Payne DK,Fuseler JW,Owens MWdoi
10.1007/BF01534438subject
Has Abstractpub_date
1994-08-01 00:00:00pages
407-17issue
4eissn
0360-3997issn
1573-2576journal_volume
18pub_type
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