Zinc deficiency and IL-6 -174G/C polymorphism in old people from different European countries: Effect of zinc supplementation. ZINCAGE study

Eugenio Mocchegiani, Robertina Giacconi, Laura Costarelli, Elisa Muti, Catia Cipriano, Silvia Tesei, Sara Pierpaoli, Cinzia Giuli, Roberta Papa, Fiorella Marcellini, Nazzarena Gasparini, Romeo Pierandrei, Francesco Piacenza, Ermina Mariani, Daniela Monti, George Dedoussis, Stavroula Kanoni, Georges Herbein, Tamas Fulop, Lothar RinkJolanta Jajte, Marco Malavolta

Research output: Contribution to journalArticlepeer-review

Abstract

IL-6 SNP at position -174 is associated with age-related diseases characterized by an impaired Zn status. This polymorphism seems also relevant in regulating the expression of proteins, such as Metallothioneins (MT), involved in the modulation of Zn homeostasis. Since high IL-6 levels in elderly induce hypozinchemia, the IL-6-174 SNP may be useful to identify old subjects who are at risk for Zn deficiency. The objectives of this study are: (1) to choose old subjects who effectively need Zn supplementation and (2) to study the effect of Zn supplementation on Zn, immune and psychological status in genetically selected subjects. For this purpose, a baseline study comprising 895 healthy old subjects recruited in Central-Northern and Southern European Countries was carried out by evaluating their dietary intake, psychological and immune parameters as well as their Zn status. A Zn supplementation trial was performed in 110 old subjects selected on the basis of their plasma Zn levels and IL-6 SNP. After correcting for age and Zn intake, C- carriers displayed higher MT and lower levels of several parameters related to zinc status (plasma Zn, erythrocyte Zn and NO-induced release of Zn in PBMC) than C+ carriers. Better NK cell cytotoxicity and psychological functions (PSS, MMSE) were also found in C+ than C- carriers strictly related to the zinc status. However, independently by the polymorphism, all subjects with plasma zinc ≤10.5 μM showed the worst immune response and psychological functions. Supplementation was carried out in C+ and C- carriers with stable low plasma zinc levels (≤10.5 μM at baseline and at 1 year follow-up) and in C- carriers with unstable plasma zinc (≤10.5 μM at baseline and >10.5 μM at 1 year follow-up). C+ carriers with plasma zinc >10.5 μM were not supplemented because showing the best immune and psychological conditions. After 48 ± 2 days of supplementation with 10 mg/day of Zn-aspartate, the NO-induced release of Zn, erythrocyte Zn and NK cell cytotoxicity increased in all groups selected for supplementation, including C- with unstable plasma zinc. In conclusion, the sole assessment of plasma Zn level is not reliable to exclude C- carriers from Zn supplementation. A possible explanation for the conflicting data on the identification of IL-6-174G as a "risk allele" based on different dietary intake in the studied population is also suggested.

Original languageEnglish
Pages (from-to)433-444
Number of pages12
JournalExperimental Gerontology
Volume43
Issue number5
DOIs
Publication statusPublished - May 2008

Keywords

  • Ageing
  • Genetic screening
  • IL-6 polymorphisms
  • Metallothioneins
  • Zinc status

ASJC Scopus subject areas

  • Ageing
  • Medicine(all)

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