Propofol specifically inhibits mitochondrial membrane potential but not complex I NADH dehydrogenase activity, thus reducing cellular ATP biosynthesis and migration of macrophages.

Abstract:

:Propofol is a widely used intravenous anesthetic agent. Our previous study showed that a therapeutic concentration of propofol can modulate macrophage functions. Mitochondria play critical roles in the maintenance of macrophage activities. This study attempted to evaluate further the effects of mitochondria on the propofol-induced suppression of macrophage functions using mouse macrophage-like Raw 264.7 cells as the experimental model. Macrophages were exposed to a clinically relevant concentration of propofol for 1, 6, and 24 h. Analysis by the Trypan blue exclusion method revealed that propofol was not cytotoxic to macrophages. Exposure of macrophages to propofol did not affect mitochondrial NADH dehydrogenase activity of complex I. However, analysis of flow cytometry showed that propofol significantly decreased the mitochondrial membrane potential of macrophages. Cellular levels of ATP in macrophages were significantly reduced after propofol administration. In parallel with the dysfunction of mitochondria, the chemotactic analysis showed that exposure to propofol significantly inhibited the migration of macrophages. This study shows that a therapeutic concentration of propofol can specifically reduce the mitochondrial membrane potential, but there is no such effect on complex I NADH dehydrogenase activity. Modulation of the mitochondrial membrane potential may decrease the biosynthesis of cellular ATP and thus reduce the chemotactic activity of macrophages. This study provides in vitro data to validate mitochondrial dysfunction as a possible critical cause for propofol-induced immunosuppression of macrophage functions.

journal_name

Ann N Y Acad Sci

authors

Wu GJ,Tai YT,Chen TL,Lin LL,Ueng YF,Chen RM

doi

10.1196/annals.1338.019

subject

Has Abstract

pub_date

2005-05-01 00:00:00

pages

168-76

eissn

0077-8923

issn

1749-6632

pii

1042/1/168

journal_volume

1042

pub_type

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