Abstract
We adapted a rat model of gastrointestinal candidiasis for studies of in vivo gastric colonization withCandida albicans. Whereas normal rats cleared a single intragastric inoculum of 5×106 C. albicans from the stomach within 4 hours, rats pretreated with chloramphenicol and gentamicin achieved stable gastric colonization for at least 5 days after administration of this inoculum. We next used this model to study host modifications hypothesized to alter gastric colonization. A first group received dilute HCl 4 hr before yeast inoculation, to induce acute superficial gastric erosions; another group was treated with glucocorticosteroid beginning 12 days before yeast inoculation; and another group received famotidine therapy beginning 3 days before yeast inoculation, to neutralize gastric acidity. Recovery of yeasts from stomachs was significantly different from the control group only in rats treated with steroids; greater colonization was found in the rats so treated. In a final group of experiments, we attempted to inhibit in vivo gastric colonization with yeasts by preincubation of yeasts in vitro with a polyclonal antiserum raised in rabbits against heat-killedC. albicans. We were not able to demonstrate inhibition of gastric colonization by preincubation with this antiserum in this model system.
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Greenfield, R.A., Joyce, W.A. Gastric colonization withCandida albicans . Mycopathologia 122, 1–5 (1993). https://doi.org/10.1007/BF01103702
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DOI: https://doi.org/10.1007/BF01103702