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The Role of Protein and Calorie Restriction in Outcome From Salmonella Infection in Mice

Department of Surgery, University of Miami School of Medicine, Miami, Florida

George F. Babcock, PHD

Department of Surgery, University of Cincinnati Medical Center, and Shriners Burns Institute, Cincinnati, Ohio

J. Wesley Alexander, MD, ScD

Department of Surgery, University of Cincinnati Medical Center, and Shriners Burns Institute, Cincinnati, Ohio

We studied the separate effects of protein and calorie restriction in mice challenged with Salmonella typhimurium, an intracellular pathogen eliminated by cell-mediated immunity. Female A/J mice (n = 73) were placed on one of eight solid diets for 3 weeks. Animals were weighed at the beginning and the end of the feeding period. Diets were adjusted by two factors. The total amount of protein in the diet was 1%, 5%, 20%, or 40% by weight. The diets were fed to half the mice in quantities of 3 g and to the other half at 1.5 g per mouse per day. At the end of 3 weeks, mice were injected intraperitoneally with bacteria and mortality was observed for 2 weeks. Mortality was related to protein intake and was significantly higher in the 1% and 5% groups ( ²: p = .0021). However, mortality was lower in the calorie-restricted groups (²: p = .0242). Although caloric intake did not affect cell-mediated immunity, the response to 2,4-dinitrofluorobenzene was greater in the low protein groups. Lymphoproliferative responses in the mixed lymphocyte response were not affected by either caloric or protein intake. Lymphoproliferative responses to both lipopolysaccharide and phytohemagglutinin were affected by dietary protein but not by caloric intake; proliferative responses were higher in the low-protein groups. We conclude that protein restriction can increase mortality in this model. On the other hand, short-term calorie restriction can improve survival. (Journal of Parenteral and Enteral Nutrition 16:561-565, 1992)

Journal of Parenteral and Enteral Nutrition, Vol. 16, No. 6, 561-565 (1992)
DOI: 10.1177/0148607192016006561


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