The cytotoxicity of chrysotile asbestos fibers to pulmonary alveolar macrophages. I. Effects of inhibitors of ADP-ribosyl transferase.

Abstract:

:Pulmonary alveolar macrophages exposed to very short chrysotile asbestos fibers present a typical cytotoxic response: extracellular releases of lactate dehydrogenase and beta-galactosidase, and a decrease in cellular ATP content. The objective of this study was to determine if nicotinamide and 3-aminobenzamide, two inhibitors of the ADP-ribosyl transferase, could modify the in vitro toxicity of chrysotile fibers. After 30 min of pre-exposure with each of the two inhibitors, pulmonary alveolar macrophage monolayers were concomitantly exposed for 18 hours to 50 micrograms of fibers. It was observed that, in a dose-effect relationship (5 to 30 mM), nicotinamide was very effective in reducing the extracellular liberation of the marker enzymes. At 30 mM, the enzyme releases in the medium had returned to control values; the restoration of cell viability was confirmed by ATP levels. Up to 5 mM 3-aminobenzamide did not provide any protection against chrysotile cytotoxicity. Nicotinic acid, a structural analogue of nicotinamide, but not an inhibitor of the ADP-ribosyl transferase, also showed no protective effect. Nicotinamide and 3-aminobenzamide increased the intracellular NAD+ pools, respectively by 350% and 250%. However, with or without additives, the chrysotile fibers caused a constant and significant decrease in NAD+ levels (40-55 pmoles). These results suggest that the inhibition of the nuclear ADP-ribosyl transferase is not the major mechanism by which nicotinamide protects pulmonary alveolar macrophages against the toxicity of chrysotile asbestos fibers.

journal_name

Cell Biol Toxicol

authors

Nadeau D,Lane DA

doi

10.1007/BF00141284

subject

Has Abstract

pub_date

1988-03-01 00:00:00

pages

13-30

issue

1

eissn

0742-2091

issn

1573-6822

journal_volume

4

pub_type

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