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Cytokeratin filament modulation in pulmonary microvessel endothelial cells by vasoactive agents and culture confluency.

Abstract：

:Recently, bovine pulmonary microvascular endothelial cells (PMV) were shown to contain cytokeratin 8 and 19 intermediate filaments (Patton et al., 1990). In this study, we examine the effect of culture contiguity and vasoactive agents on the content and assembly of cytokeratins in PMV. Immunofluorescent staining of PMV cultures show a progressive increase in cytokeratin filament assembly. In freshly plated PMV, keratin appears as hazy staining (less than 4 hr) and later organizes into keratin 'plaques' (4 days) associated with cell-cell contacts; post confluent (greater than 7 days) PMV cultures contain fully assembled cytokeratin filaments which extend to the cell periphery and approach filaments in apposed cells. Vimentin filaments are also present in freshly plated PMV cultures but unlike cytokeratins, become less filamentous at confluency. This cell density-dependent modulation of cytokeratins is also demonstrated by densitometric analysis of autoradiographs of 35S-methionine labeled keratins in which PMV keratin content is elevated at high cell densities, while vimentin content remains constant. Desmoplakins I and II, components of desmosomes, could not be demonstrated in PMV by immunoblotting. PMV treated with permeability modulating agents (4 x 10(-3) M EGTA, 1 microM cytochalasin B, 1 microM bradykinin, 1 microM A23187, and 1 microM PMA) exhibit border retraction and altered keratin filament staining. From these studies we conclude: 1) cytokeratin 8 and 19 containing intermediate filaments are present in confluent PMV cultures with vimentin but without desmosomes, 2) the state of assembly of PMV cytokeratin and vimentin filaments appears to be oppositely affected by culture contiguity, and 3) treatment of monolayers with vasoactive agents alters the state of assembly of cytokeratin filaments. We speculate that modulation of cytokeratin assembly in PMV may be involved in regulation of pulmonary microvascular structure and function.

journal_name

Tissue Cell

journal_title

Tissue & cell

authors

Alexander JS,Patton WF,Yoon MU,Shepro D

doi

10.1016/0040-8166(91)90069-6

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

141-50

issue

2

eissn

0040-8166

issn

1532-3072

pii

0040-8166(91)90069-6

journal_volume

23

pub_type

杂志文章

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