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1994-09-05
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Document 0821
DOCN M9480821
TI Susceptibility of mice with MAIDS to cytomegalovirus retinitis at times
relative to Th1/Th2 shift.
DT 9410
AU Dix RD; Cray C; Cousins SW; Bascom Palmer Eye Institute, University of
Miami School of; Medicine, FL.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:623 (abstract no. V-32). Unique
Identifier : AIDSLINE ASM94/94313124
AB Prior to absolute decline in CD4+ T cell number in late-stage AIDS,
HIV-1 infection produces a relative immune dysregulation caused by a
shift in CD4+ T helper (Th) function from a mechanism that promotes
cell-mediated immunity (Th1 response) to one that favors humoral
immunity (Th2 response). Theoretically, this dysregulation predisposes
to opportunistic infections. Mice with retrovirus-induced
immunodeficiency syndrome (MAIDS) also exhibit a Th1/Th2 shift that
becomes evident approximately 3 wks after retrovirus infection. We
therefore explored the susceptibility of mice with MAIDS to murine
cytomegalovirus (MCMV) retinitis at times relative to Th1/Th2 shift.
Groups of adult C57BL/6 mice were infected with a mixture of murine
retroviruses (LP-BM5 MuLV); control animals received PBS. At 2 wks
(MAIDS-2), 4 wks (MAIDS-4), and 12 wks (MAIDS-12), MuLV-infected and
age-matched control mice were inoculated by subretinal injection with
MCMV and compared 10 days postinfection for evidence of MCMV replication
and typical retinitis. When compared with immunocompetent controls,
MAIDS-4 and MAIDS-12 mice demonstrated increased ocular MCMV titers.
Whereas the frequency of typical necrotizing retinitis in MAIDS-12
animals was 88%, retinitis was not observed in immunocompetent, MAIDS-2
or MAIDS-4 animals. Nonetheless, evidence of retinal infection without
retinitis was observed in 0%, 12% and 70% of immunocompetent, MAIDS-2,
and MAIDS-4 animals, respectively. We conclude that although typical
MCMV retinitis cannot be induced at time of initial Th1/Th2 shift,
increased MCMV replication and evidence of retinal infection is
observed.
DE Animal Antibody Formation Comparative Study Cytomegalovirus
Retinitis/*IMMUNOLOGY Disease Susceptibility Immunity, Cellular Mice
Murine Acquired Immunodeficiency Syndrome/*COMPLICATIONS/ *IMMUNOLOGY
Muromegalovirus T-Lymphocytes, Helper-Inducer/*IMMUNOLOGY Time Factors
T4 Lymphocytes/*IMMUNOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).