Perilla ketone increases endothelial cell monolayer permeability in vitro

C. M. Waters, J. S. Alexander, T. R. Harris, F. R. Haselton

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Perilla ketone (PK) is a potent lung toxin that causes increased microvascular permeability pulmonary edema in grazing animals. Because the mechanism of action of PK is not known, we investigated whether PK directly affects endothelial cells. Bovine aortic endothelial cells were grown to confluence on Cytodex-3 microcarrier beads and placed in a chromatographic cell column. Monolayer permeability was evaluated from the elution profiles of three optical tracers: blue dextran (2 x 106 mol wt), sodium fluorescein (NaF, 342 mol wt), and cyanocobalamin (B12, 1,355 mol wt). Perfusion with 1.2 mM PK increased permeability within 15 min to NaF and B12 by 51 ± 6 and 54 ± 11%, respectively. Permeability returned to baseline after PK removal. These in vitro results suggest that PK produces a rapid and reversible increase in endothelial permeability directly. Staining of fixed cells with rhodamine-phalloidin revealed a major disruption of actin microfilaments after PK treatment. Because previous reports suggested that PK may be activated via cytochrome P-450, we attempted to block this using the cytochrome P-450 inhibitor ketoconazole. Ketoconazole alone did not significantly affect permeability, and the combination of PK and ketoconazole resulted in permeability increases similar to those measured for PK alone. This suggests that PK may not require cytochrome P-450 to increase vascular permeability.

Original languageEnglish
Pages (from-to)2493-2501
Number of pages9
JournalJournal of Applied Physiology
Volume74
Issue number5
DOIs
StatePublished - 1993

Keywords

  • actin
  • cell-column chromatography
  • cytochrome P-450
  • indicator- dilution
  • lung toxin

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Fingerprint

Dive into the research topics of 'Perilla ketone increases endothelial cell monolayer permeability in vitro'. Together they form a unique fingerprint.

Cite this