title: 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.
authors.affiliation: National Institute for Occupational Safety and Health, ALOSH, Morgantown, West Virginia.
authors.forename: N
authors.initials: N
authors.lastname: Hahon
authors.forename: J A
authors.initials: JA
authors.lastname: Booth
authors.forename: L
authors.initials: L
authors.lastname: Flowers
mesh_terms: D000818:Animals; D001194:Asbestos / Q000009:adverse effects*; D001564:Benzo(a)pyrene / Q000493:pharmacokinetics / Q000633:toxicity*; D002478:Cells, Cultured; D003031:Coal / Q000009:adverse effects*; D003043:Cocarcinogenesis; D007370:Interferon Type I / Q000096:biosynthesis*; D007668:Kidney / Q000187:drug effects*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D008253:Macaca mulatta; D008297:Male; D008670:Metals / Q000009:adverse effects*; D009975:Orthomyxoviridae / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D014762:Viral Interference
chemical_list: D003031:Coal; D007370:Interferon Type I; D008670:Metals; D001194:Asbestos; D001564:Benzo(a)pyrene