Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
Utilizza questo identificativo per citare o creare un link a questo documento:
|Titolo:||Corticosteroid inhibition of airway microvascular leakage|
|Autori interni:||BOSCHETTO, Piera|
|Data di pubblicazione:||1991|
|Rivista:||AMERICAN REVIEW OF RESPIRATORY DISEASE|
|Abstract:||We studied the effect of dexamethasone on microvascular leakage (using Evans blue dye as a marker of plasma exudation) induced in rat airways by platelet-activating factor (PAF). Intravenously administered PAF caused a dose-related increase in plasma leakage over the range 0.1 to 1 micrograms/kg. At 500 ng/kg PAF, the response was maximal in the extrapulmonary airways examined with increases in leakage above those in control animals of 312% in the larynx, 295% in the trachea, and 167% in the main bronchi. A maximal response was not achieved in the intrapulmonary airways at the doses of PAF tested: at 1 microgram/kg the increase was 206% above that in control animals. Dexamethasone, given by intraperitoneal injection 24 h and 4 h before PAF at a dose of 0.2 mg/kg on each occasion, partially inhibited leakage induced by PAF (1 microgram/kg) in all airway levels studied by 43 to 65%. At each level the tissue concentration of dye was reduced to a value that was significantly (p less than 0.05) different from either PAF or control values. We also determined whether a high dose (8 mg/kg) of dexamethasone given intraperitoneally would inhibit plasma leakage of dye induced by either PAF or antigen-challenge of sensitized rats. When given 4 h before antigen, dexamethasone completely prevented allergen-induced leakage in the airways showing significant leakage (larynx, trachea, and intrapulmonary airways). Similarly, dexamethasone (4 h before) partially inhibited PAF-induced leakage in the trachea and main bronchi. In summary, in rat airways, both low and high doses of dexamethasone markedly inhibit mediator-induced plasma exudation.|
|Appare nelle tipologie:||03.1 Articolo su rivista|
File in questo prodotto:
Non ci sono file associati a questo prodotto.
- PubMed Central loading...
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.