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Altered gut barrier function to Candida during parenteral nutrition.

We hypothesize that catheter-related sepsis with Candida during total parenteral nutrition (TPN) is caused by Candida translocation from the gut. Fifty male Sabra rats weighing 330 +/- 40 g were randomized into four groups and put into metabolic cages: group 1 (n = 16), nonoperated free-feeding controls; group 2 (n = 10), infused with normal saline and free feeding; group 3 (n = 14), infused with TPN solution for a total of 36 kcal and 1.5 g g protein.100 g-1 body wt.day-1;group 4 (n = 10), same TPN regimen as group 3 but also receiving oral and intravenous antibiotics. On day 7, all animals received 1.5 x 10(10) viable Candida albicans CBS 562 cells by gavage, and 24 h later, the number of Candida colony-forming units in blood, mesenteric lymph nodes, and kidneys was determined. No growth of Candida was detected in group 1 or group 2. Positive Candida cultures were found in the blood, mesenteric lymph nodes, and kidneys of groups 3 and 4, although levels reached statistical significance only for mesenteric lymph nodes in group 3. Because Candida growth occurred exclusively in groups receiving TPN and bowel rest, we conclude that altered gut-barrier function to Candida occurs during TPN and speculate that Candida sepsis during TPN might be the result of Candida translocation from the gut due to the combination of high-density Candida colonization and favorable local conditions in the gut induced by TPN and bowel rest.