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Comparative Study | Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.

Evidence implicating phospholipase as a virulence factor of Candida albicans.

A S Ibrahim, F Mirbod, S G Filler, Y Banno, G T Cole, Y Kitajima, J E Edwards Jr, Y Nozawa, M A Ghannoum
A S Ibrahim
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F Mirbod
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S G Filler
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Y Banno
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G T Cole
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Y Kitajima
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J E Edwards Jr
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Y Nozawa
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M A Ghannoum
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ABSTRACT

Three different approaches were used to investigate the role of extracellular phospholipases in the pathogenicity of Candida albicans. First, we compared 11 blood isolates of this yeast with an equal number of commensal strains isolated from the oral cavities of healthy volunteers. Blood isolates produced significantly more extracellular phospholipase activity than the commensal strains did. Second, two clinical isolates of C. albicans that differed in their levels of virulence in a newborn mouse model were compared for their ability to secrete phospholipases. The invasive strain produced significantly more extracellular phospholipase activity than the noninvasive strain did. Third, nine blood isolates were characterized for their phospholipase and proteinase production, germ tube formation, growth, and adherence to and damage of endothelial cells in vitro. These factors were analyzed subsequently to determine whether they predicted mortality in a mouse model of hematogenously disseminated candidiasis. By proportional hazard analysis, the relative risk of death was 5.6-fold higher (95% confidence interval, 1.672 to 18.84 [P < 0.005]) in the mice infected with the higher-phospholipase-secreting strains than in the low-phospholipase secretors. None of the other putative virulence factors predicted mortality. Characterization of phospholipases secreted by three of the blood isolates showed that these strains secreted both phospholipase B and lysophospholipase-transacylase activities. These results implicate extracellular phospholipase as a virulence factor in the pathogenesis of hematogenous infections caused by C. albicans.

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Evidence implicating phospholipase as a virulence factor of Candida albicans.
A S Ibrahim, F Mirbod, S G Filler, Y Banno, G T Cole, Y Kitajima, J E Edwards Jr, Y Nozawa, M A Ghannoum
Infection and Immunity May 1995, 63 (5) 1993-1998; DOI:

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Evidence implicating phospholipase as a virulence factor of Candida albicans.
A S Ibrahim, F Mirbod, S G Filler, Y Banno, G T Cole, Y Kitajima, J E Edwards Jr, Y Nozawa, M A Ghannoum
Infection and Immunity May 1995, 63 (5) 1993-1998; DOI:
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