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M94A3206.TXT
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1994-10-25
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Document 3206
DOCN M94A3206
TI Immune response and variation in provirus level during early phase of
FIV-infected cats.
DT 9412
AU Ohkura T; Iwa S; Tanabe-Tochikura A; Tamura T; Sato N; Kurimura T; Dept.
of Pathology, Research Institute for Microbial Deseases,; Osaka
University, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):129 (abstract no. PA0136). Unique
Identifier : AIDSLINE ICA10/94369369
AB OBJECTIVE: To gain a better understanding of how the antibody in plasma
and the provirus in PBMC vary in early phase of infection of SPF cats
with FIV, we have analyzed the FIV and SPF cat system as an animal model
of AIDS. METHODS: After i.v. inoculation of FIV (KYO-1 strain) to 5 SPF
cats, the titer of antibody in plasma and the level of proviral DNA in
PBMC was followed for 15 weeks. The total antibody response to FIV was
analyzed by immunoprecipitation, and the level of total antibody was
calculated from cpm of 35S labeled antigen bound with Protein A
Sepharose CL4B beads. The anti-gp42 titer in plasma was further assayed
with Vet Red Test (AGEN) by the mixture of plasma sample and red blood
cells of a normal cat. Proviral DNA in PBMC was detected by PCR for gag
region of FIV. RESULTS: Overt primary disease was not observed during
the experiment, but anti-gp42 was first detected in week 1-2 after
infection, aNd then the anti-gp42 titer gradually increased with the
level of total antibody. The results of immunoprecipitation indicated
the antibody to FIV env protein expressed at 2-3 weeks after infection.
Proviral DNA was first detectable in week 2-3 after infection and then
the DNA level evidently fluctuated. DISCUSSION AND CONCLUSIONS: By 3
weeks after infection, proviral state in PBMC was established and then
the level of proviral DNA in PBMC fluctuated significantly forming 2-3
peaks up to the end of experimental period, but the titer of antigen to
gp42 gradually increased after first detection of 1-2 weeks after
infection. Those results indicate that the antibody response to gp42 is
earlier than the first detection of proviral DNA, and then the titer of
anti-gp42 elevated continuously suggesting antigen stimulation
irrelevant of fluctuation in proviral DNA level.
DE Acquired Immunodeficiency Syndrome/MICROBIOLOGY Animal Antibodies,
Viral/*BIOSYNTHESIS/BLOOD Antibody Formation Cats Disease Models,
Animal DNA, Viral/*BLOOD Feline Acquired Immunodeficiency
Syndrome/*IMMUNOLOGY Genes, gag Human Immunodeficiency Virus,
Feline/IMMUNOLOGY/ISOLATION & PURIF/ *PHYSIOLOGY
Lymphocytes/*MICROBIOLOGY Polymerase Chain Reaction/METHODS
Proviruses/IMMUNOLOGY/ISOLATION & PURIF/*PHYSIOLOGY Virus Replication
MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).