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1996-03-04
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Document 0706
DOCN M9640706
TI Elevated aspartic proteinase secretion and experimental pathogenicity of
Candida albicans isolates from oral cavities of subjects infected with
human immunodeficiency virus.
DT 9604
AU De Bernardis F; Chiani P; Ciccozzi M; Pellegrini G; Ceddia T; D'Offizzi
G; Quinti I; Sullivan PA; Cassone A; Department of Bacteriology and
Medical Mycology, Istituto; Superiore di Sanita, Rome, Italy.
SO Infect Immun. 1996 Feb;64(2):466-71. Unique Identifier : AIDSLINE
MED/96145065
AB Isolates of Candida albicans from the oral cavities of subjects at
different stages of human immunodeficiency virus (HIV) infection or
uninfected controls were examined for (i) production of aspartic
proteinase(s), a putative virulence-associated factor(s); (ii) the
presence in the fungal genome of two major genes (SAP1 and SAP2) of the
aspartic proteinase family; and (iii) experimental pathogenicity in a
murine model of systemic infection. It was found that the fungal
isolates from symptomatic patients secreted, on average, up to eightfold
more proteinase than the isolates from uninfected or HIV-infected but
asymptomatic subjects. This differential property was stably expressed
by the strains even after years of maintenance in stock cultures.
Moreover, representative high-proteinase isolates were significantly
more pathogenic for mice than low-proteinase isolates of C. albicans.
The characters high proteinase and increased virulence were not
associated with a single molecular type or category identifiable through
DNA fingerprinting or pulsed-field electrophoretic karyotype, and both
SAP1 and SAP2 genes were present in both categories of isolates, on the
same respective chromosomes. In conclusion, our data suggest that during
HIV infection more-virulent strains or biotypes of C. albicans which are
identifiable by direct analysis of virulence determinants are selected.
It also appears that the biotype switch to increased aspartic proteinase
and virulence properties occurs before the HIV-infected subject enters
the symptomatic stage and overt AIDS.
DE Animal Aspartic Proteinases/GENETICS/*SECRETION Candida
albicans/ENZYMOLOGY/*PATHOGENICITY Genes, Fungal Human HIV
Infections/*MICROBIOLOGY Male Mice Mouth/*MICROBIOLOGY Rabbits
Support, Non-U.S. Gov't Virulence JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).