Inhibition by pulmonary surfactant Curosurf of secretory phospholipase A2 expression in guinea-pig alveolar macrophages.
Biochem Pharmacol
; 54(9): 1055-8, 1997 Nov 01.
Article
in En
| MEDLINE
| ID: mdl-9374427
ABSTRACT
Replacement therapy with exogenous surfactant has been proven successful in animal models of acute respiratory distress syndrome (ARDS). Here, we investigated the effect of seminatural surfactant Curosurf on the expression of secretory phospholipase A2 (sPLA2) in guinea-pig alveolar macrophages (AM). The latter produced an sPLA2 activity whose level was markedly reduced when culture medium was supplemented with Curosurf. This effect was concentration-dependent and was accompanied by a decrease in sPLA2 mRNA levels. By contrast, when AM were first cultured for 20 hr and then incubated with Curosurf, no significant change was observed in their sPLA2 activity. Finally, f-Met-Leu-Phe (FMLP)-induced thromboxane B2 release from AM was not altered by Curosurf, indicating that the inhibition of sPLA2 expression cannot be attributed to a nonspecific membraneous effect of Curosurf. These findings show that pulmonary surfactant modulates the expression of sPLA2 in AM and suggest that this effect may account for the clinical efficacy of surfactant replacement therapy in ARDS.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phospholipases A
/
Phospholipids
/
Biological Products
/
Pulmonary Surfactants
/
Macrophages, Alveolar
/
Enzyme Inhibitors
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Biochem Pharmacol
Year:
1997
Document type:
Article
Affiliation country:
France