Effects of perfluorocarbons on surfactant exocytosis and membrane properties in isolated alveolar type II cells.
Respir Res
; 11: 52, 2010 May 09.
Article
em En
| MEDLINE
| ID: mdl-20459693
ABSTRACT
BACKGROUND:
Perfluorocarbons (PFC) are used to improve gas exchange in diseased lungs. PFC have been shown to affect various cell types. Thus, effects on alveolar type II (ATII) cells and surfactant metabolism can be expected, data, however, are controversial.OBJECTIVE:
The study was performed to test two hypotheses (I) the effects of PFC on surfactant exocytosis depend on their respective vapor pressures; (II) different pathways of surfactant exocytosis are affected differently by PFC.METHODS:
Isolated ATII cells were exposed to two PFC with different vapor pressures and spontaneous surfactant exocytosis was measured. Furthermore, surfactant exocytosis was stimulated by either ATP, PMA or ionomycin. The effects of PFC on cell morphology, cellular viability, endocytosis, membrane permeability and fluidity were determined.RESULTS:
The spontaneous exocytosis was reduced by PFC, however, the ATP and PMA stimulated exocytosis was slightly increased by PFC with high vapor pressure. In contrast, Ionomycin-induced exocytosis was decreased by PFC with low vapor pressure. Cellular uptake of FM 1-43 - a marker of membrane integrity - was increased. However, membrane fluidity, endocytosis and viability were not affected by PFC incubation.CONCLUSIONS:
We conclude that PFC effects can be explained by modest, unspecific interactions with the plasma membrane rather than by specific interactions with intracellular targets.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Membrana Celular
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Proteínas Associadas a Surfactantes Pulmonares
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Exocitose
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Células Epiteliais Alveolares
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Fluorocarbonos
Limite:
Animals
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Humans
/
Male
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article