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M9620727.TXT
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1996-02-26
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Document 0727
DOCN M9620727
TI The restricted IgG1 antibody response to maedi visna virus is seen
following infection but not following immunization with recombinant gag
protein.
DT 9602
AU Bird P; Reyburn HT; Blacklaws BA; Allen D; Nettleton P; Yirrell DL; Watt
N; Sargan D; McConnell I; Department of Veterinary Pathology, University
of Edinburgh, UK.
SO Clin Exp Immunol. 1995 Nov;102(2):274-80. Unique Identifier : AIDSLINE
MED/96069875
AB Maedi-visna (MVV) is a retrovirus of the subfamily lentivirinae which
includes HIV, simian immunodeficiency virus (SIV) and feline
immunodeficiency virus (FIV). Infection of its natural host, the sheep,
does not cause overt immunodeficiency, but rather a chronic inflammatory
disease. However, subtle immunological changes following infection have
been reported including a sheep IgG1 subclass-restricted
MVV-neutralizing antibody. Here we demonstrate by Western blotting that
there is no IgG2 serum antibody response to any MVV antigen after MVV
infection, in contrast to infection with the parapox virus Orf, when
serum IgG2 anti-Orf antibody is readily detected. By ELISA, the IgG1
antibody titres to Orf are higher than to MVV, but the minimum MVV serum
antibody IgG1/IgG2 ratio is significantly raised compared with that for
Orf virus antibody in the same sheep, indicating that the IgG2 defect in
MVV infection cannot be accounted for by differences in the sensitivity
of the Orf and MVV ELISA. Serum IgG2 anti-MVV gag p. 25 can be detected
in both normal and MVV-infected sheep following immunization with
purified recombinant MVV gag p 25 protein in Freund's complete adjuvant.
The failure to make an IgG2 MVV-specific antibody indicates that
immunological dysfunction can arise with macrophage tropic lentiviruses,
and it may aid viral persistence.
DE Animal Antibodies, Viral/*BIOSYNTHESIS Antigens, Viral/IMMUNOLOGY
Gene Products, gag/*IMMUNOLOGY IgG/*BIOSYNTHESIS Immunization
Immunoglobulin Isotypes/IMMUNOLOGY Orf Virus/IMMUNOLOGY Recombinant
Proteins/IMMUNOLOGY Sheep Sheep Diseases/IMMUNOLOGY Support, Non-U.S.
Gov't Time Factors Visna/*IMMUNOLOGY Visna-Maedi Virus/*IMMUNOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).