Effect of infant formula zinc and iron level on zinc absorption, zinc status, and immune function in infant rhesus monkeys

S. Polberger, M. P. Fletcher, T. W. Graham, K. Vruwink, M. Eric Gershwin, B. Lönnerdal

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

To evaluate the effects of marginal zinc (Zn) deficiency on Zn absorption and metabolism, three groups of infant rhesus monkeys (n = 4/group) were fed from birth to 5 months of age either a regular infant formula (5 mg Zn/L) or a low-Zn formula (1 mg Zn/L). Since iron (Fe) intake may affect Zn absorption, the low-Zn formula was given without (1 mg Fe/L) or with Fe fortification (12 mg/L). At monthly intervals, Zn absorption and retention were assessed by gavage feeding with 65Zn and whole-body counting immediately after and on days 4, 7, and 11 after intubation. Blood samples were drawn before dosing for analyses of various potential markers of Zn status. Infants fed low-Zn formula had slower weight gain than controls; however, length growth was similar in all groups. 65Zn retention was considerably higher in both groups fed low-Zn formula (40%) than in the control group (20%), whereas plasma Zn levels were normal in all infants. Plasma metallothionein levels were generally very low and detectable in only 5 samples of 48; however, 4 of these were found in control infants. Neutrophil chemotaxis assessed at the end of the study was impaired in low- Zn infants compared to controls. In addition, low-Zn infants had increased levels of interleukin-2 at the end of the study. No differences were seen between the groups in hemoglobin levels, total white blood cells/absolute neutrophil counts, or plasma activities of 5'-nucleotidase or angiotensin converting enzyme. In conclusion, marginal Zn intake in infant rhesus monkeys resulted in increased Zn retention, which was not enough to completely compensate for the lower Zn intake. The higher level of iron fortification studied did not affect Zn retention significantly.

Original languageEnglish (US)
Pages (from-to)134-143
Number of pages10
JournalJournal of Pediatric Gastroenterology and Nutrition
Volume22
Issue number2
DOIs
StatePublished - 1996

Fingerprint

Infant Formula
infant formulas
Macaca mulatta
Zinc
Iron
zinc
iron
neutrophils
Neutrophils
Whole-Body Counting
5'-nucleotidase
5'-Nucleotidase
Metallothionein
metallothionein
chemotaxis
peptidyl-dipeptidase A

Keywords

  • Immune function
  • Iron
  • Zinc
  • Zinc absorption

ASJC Scopus subject areas

  • Gastroenterology
  • Histology
  • Medicine (miscellaneous)
  • Food Science
  • Pediatrics, Perinatology, and Child Health

Cite this

Effect of infant formula zinc and iron level on zinc absorption, zinc status, and immune function in infant rhesus monkeys. / Polberger, S.; Fletcher, M. P.; Graham, T. W.; Vruwink, K.; Gershwin, M. Eric; Lönnerdal, B.

In: Journal of Pediatric Gastroenterology and Nutrition, Vol. 22, No. 2, 1996, p. 134-143.

Research output: Contribution to journalArticle

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AU - Gershwin, M. Eric

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N2 - To evaluate the effects of marginal zinc (Zn) deficiency on Zn absorption and metabolism, three groups of infant rhesus monkeys (n = 4/group) were fed from birth to 5 months of age either a regular infant formula (5 mg Zn/L) or a low-Zn formula (1 mg Zn/L). Since iron (Fe) intake may affect Zn absorption, the low-Zn formula was given without (1 mg Fe/L) or with Fe fortification (12 mg/L). At monthly intervals, Zn absorption and retention were assessed by gavage feeding with 65Zn and whole-body counting immediately after and on days 4, 7, and 11 after intubation. Blood samples were drawn before dosing for analyses of various potential markers of Zn status. Infants fed low-Zn formula had slower weight gain than controls; however, length growth was similar in all groups. 65Zn retention was considerably higher in both groups fed low-Zn formula (40%) than in the control group (20%), whereas plasma Zn levels were normal in all infants. Plasma metallothionein levels were generally very low and detectable in only 5 samples of 48; however, 4 of these were found in control infants. Neutrophil chemotaxis assessed at the end of the study was impaired in low- Zn infants compared to controls. In addition, low-Zn infants had increased levels of interleukin-2 at the end of the study. No differences were seen between the groups in hemoglobin levels, total white blood cells/absolute neutrophil counts, or plasma activities of 5'-nucleotidase or angiotensin converting enzyme. In conclusion, marginal Zn intake in infant rhesus monkeys resulted in increased Zn retention, which was not enough to completely compensate for the lower Zn intake. The higher level of iron fortification studied did not affect Zn retention significantly.

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