Chimeric viruses between SIVmac and various HIV-1 isolates have biological properties that are similar to those of the parental HIV-1.

Important note: Information in this article was accurate in 1997. The state of the art may have changed since the publication date.

Chimeric viruses between SIVmac and various HIV-1 isolates have biological properties that are similar to those of the parental HIV-1.

AIDS. 1996 Oct;10(12):1331-7. Unique Identifier : AIDSLINE MED/97057722
Kuwata T; Shioda T; Igarashi T; Ido E; Ibuki K; Enose Y; Stahl-Hennig C; Hunsmann G; Miura T; Hayami M; Institute for Virus Research, Kyoto University, Japan.

Abstract: OBJECTIVE: To examine the biological properties of HIV-1/SIVmac chimeric viruses from HIV-1 isolates that have different replication rates, cell tropisms and cytopathicities. DESIGN AND METHODS: Four chimeric viruses with gag, pol, vif, vpx, nef and long terminal repeats of SIVmax and vpr, tat, rev, vpu and env of various HIV-1 isolates were constructed and compared in vitro. Cynomolgus monkeys were inoculated with two chimeras that were replicative in monkey peripheral blood mononuclear cells (PBMC). RESULTS: The type-specific neutralization of the chimeras by monoclonal antibodies 0.5 beta and mu 5.5, which recognize V3 of HIV-1IIIB and HIV-1MN respectively, was observed to be similar to those of the parental viruses, HIV-1NL432, HIV-1HAN2 and HIV-1SF13. The chimeras constructed from HIV-1SF2 and HIV-1SF13, which were isolates from the same individual but from different disease stages, reflected their parental properties, that is, the isolate from the later stage was rapid-high replicating, was more cytopathic and had a wider host range. Chimeras constructed from HIV-1HAN2' HIV-1SF13 and HIV-1NL432 were infectious to macaque monkeys, although the monkeys infected with the chimera from HIV-1SF13 showed lower virus loads and shorter viremic periods than those infected with the others. CONCLUSIONS: Chimeras have in vitro properties that are similar to those of their parental HIV-1 isolates, but their growth in macaque PBMC was dependent on which HIV-1 isolate was used. Evaluation of a vaccine by challenging with viruses possessing different antigenicities has become possible in macaque monkeys using newly constructed chimeras.

Keywords: *Chimera *HIV-1/GENETICS *HIV-1/PHYSIOLOGY *SIV/GENETICS *SIV/PHYSIOLOGY
970530
M9751983

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