Coinhibition of viral interferon induction by benzo[a]pyrene in association with occupation-related particles.

Abstract:

:Benzo[a]pyrene (B[a]P) in combination with coal, asbestos, or metal particles was studied for its inhibitory effects on interferon-alpha/beta induction by influenza virus in rhesus monkey kidney (LLC-MK2) cell monolayers. B[a]P per se had no adverse effect on the induction process. However, when cell cultures were pretreated with B[a]P that was bioactivated by rat liver S9 homogenate, from 52 to 65% inhibition of interferon induction occurred. Significantly greater (P less than 0.05) depression (coinhibition) of viral interferon induction (greater than 83%) resulted when bioactivated B[a]P was incorporated with coal particles representative of coal rank (anthracite, bituminous, lignite, peat). Coinhibition affected by bioactivated B[a]P was coal rank-independent but any interferon inhibitory activity affected by coal particles per se was coal rank-dependent. When metals (aluminum, aluminum oxide, ferric oxide, nickel, or chromium) or asbestos fibers (chrysotile, crocidolite, anthophyllite, or amosite) were individually mixed with bioactivated B[a]P, coinhibition of cellular interferon synthesis also resulted which was significantly greater (P less than 0.05) than that manifested by bioactivated B[a]P or particles per se. Coinhibition of interferon induction by silicates (Min-U-Sil, DQ-12, hypersthene, or wollastonite) and the bioactivated hydrocarbon was not in evidence although some silicates alone partially inhibited the induction process. Viral interferon induction was inhibited in a dose-response manner by B[a]P (+/- S9) in combination with selected particles. The adsorption of B[a]P to all types of particles was no more than 5.98 micrograms B[a]P/mg of particles and, moreover, less than 0.5% by weight. These findings provide further evidence that bioactivated B[a]P and occupation-related particles act together to coinhibit a biological defense mechanism, the interferon induction phase of the interferon system.

journal_name

Environ Res

journal_title

Environmental research

authors

Hahon N,Booth JA,Flowers L

doi

10.1016/s0013-9351(05)80153-7

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

83-98

issue

1

eissn

0013-9351

issn

1096-0953

pii

S0013-9351(05)80153-7

journal_volume

52

pub_type

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