Urinary retinol excretion and kidney function in children with shigellosis

Amal K. Mitra, Jose O. Alvarez, Lisa Guay-Woodford, George J. Fuchs, M. A. Wahed, Charles B. Stephensen

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

Background: Acute infections, including diarrhea, are associated with an increased risk of vitamin A deficiency. Urinary retinol excretion during such infections may contribute to this risk. The mechanism accounting for urinary retinol loss has not been clearly defined. Objective: This study attempted to determine whether urinary retinol loss in children with acute infection is associated with impaired kidney function, particularly impaired tubular protein reabsorption. Design: Urinary retinol excretion and kidney function were examined in 66 hospitalized children 5 mo to 5 y of age with acute Shigella dysentery. Results: Urinary retinol loss occurred in 59% of children and was substantial (>0.1 μmol/d) in 8% of them. Children with more severe disease excreted higher concentrations of urinary retinol; those with a body temperature ≥40°C excreted a mean of 0.10 ± 0.18 μmol/d compared with 0.005 ± 0.008 μmol/d for other children (P < 0.0001). Children with more severe disease also had impaired tubular reabsorption of low-molecular- weight proteins [β2-microglobulin and retinol binding protein (RBP)], although other measures of tubular and glomerular function were not similarly impaired. In multiple regression analysis, severity of disease indicators were the best predictors of tubular reabsorption of β2-microglobulin (R2 = 0.53) whereas tubular reabsorption of β2-microglobulin and RBP were found to be the best predictors of urinary retinol loss (R2 = 0.69). Conclusions: A significant amount of retinol was excreted in the urine in children with shigellosis: 8% excreted >0.10 μmol/d (15% of the daily metabolic requirement). Impaired tubular reabsorption of low-molecular-weight proteins, such as RBP transporting retinol, appeared to be the cause of this urinary retinol loss.

Original languageEnglish (US)
Pages (from-to)1095-1103
Number of pages9
JournalAmerican Journal of Clinical Nutrition
Volume68
Issue number5
StatePublished - Nov 1998

Keywords

  • α-acid glycoprotein
  • Albuminuria
  • C-reactive protein
  • Children
  • Fever
  • Kidney function
  • Malnutrition
  • Retinol
  • Retinol binding protein
  • Shigella dysenteriae
  • Shigellosis
  • Urinary excretion

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

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    Mitra, A. K., Alvarez, J. O., Guay-Woodford, L., Fuchs, G. J., Wahed, M. A., & Stephensen, C. B. (1998). Urinary retinol excretion and kidney function in children with shigellosis. American Journal of Clinical Nutrition, 68(5), 1095-1103.