Insect virus: assays for toxic effects and transformation potential in mammalian cells

P C Hartig, M A Chapman, G G Hatch, C Y Kawanishi
1989 Applied and Environmental Microbiology  
The nuclear polyhedrosis virus of Autographa californica (AcNPV) was evaluated by using in vitro test systems for toxicity and transforming potential in mammalian cells. Mass cell cultures of CV-1 and W138 cells appeared unaffected by AcNPV at a multiplicity of infection of 5. Human foreskin cells grew more slowly after inoculation but eventually produced healthy monolayers. The sensitivities of the inhibition of reproductive survivability assays were greater and demonstrated slight AcNPV
more » ... ty to CV-1, W138, and human foreskin cells. Toxicity was not ameliorated when gradient-purified or psoralen-inactivated virus was used, suggesting that the toxic component of the preparation is part of the virion or copurifies with it. AcNPV was not toxic to and did not transform BALB/c 3T3 cells or primary cell cultures derived from Syrian hamster embryo cells (SHE). Unlike the BALB/c 3T3 transformation assay, the SHE assay detected no spontaneous transformants. The SHE transformation assay can employ simian adenovirus 7 as a positive control. SHE are transformed by numerous viruses and so are useful in assessment protocols. This study suggests that in vitro assessment of viral pesticide toxicity should employ the inhibition of reproductive survivability assay and that transformation assessment is best done with the SHE-simian adenovirus 7 procedure. APPL. ENVIRON. MICROBIOL. on May 7, 2020 by guest Downloaded from
doi:10.1128/aem.55.8.1916-1920.1989 fatcat:khxgv3vrs5bnnojbcsjnfxrwku