A Novel Bio-marker of Zinc Status

Phase 1

Completed

• Conditions: Zinc Deficiency
• Interventions: Biological: Zinc

• Registration Number: NCT01062347
• Lead Sponsor: International Centre for Diarrhoeal Disease Research, Bangladesh

Brief Summary

Zinc deficiency is a widespread public health problem in developing countries. The true prevalence of this condition remains uncertain because of lack of a specific, sensitive and reliable biomarker for assessment of human zinc status. The most widely used indicator for measuring zinc status is serum zinc level, which, however, is homeostatically regulated and influenced by stress and infection. To explore the possibility of using mRNA levels of zinc responsive genes as an indicator of zinc status, Cao and Cousins suggested metallothionein (MT) mRNA level in monocytes and peripheral blood mononuclear cells as an indicator of recent zinc uptake. However, the usefulness of MT mRNA is also limited because its level is influenced by other metals, such as copper, cadmium and cobalt and it is also affected by stress. Several authors have proposed that expression of zinc transporter genes might be useful markers of Zn status. Evidence shows reduction in dietary zinc content produces a marked increase in intestinal absorption and decrease in intestinal zinc losses. As zinc homeostasis is regulated in the intestine, study of the zinc transporters in this organ may provide indication of recent zinc uptake. Recently, a few studies have begun to investigate the applicability of using white blood cell zinc transporter expression as an indicator of zinc status and found that some of the transporters are zinc responsive. The primary objective of this study is to explore whether the expression of zinc responsive genes, such as zinc transporters in human intestinal mucosal cells, can be used as indicators of zinc status. The specific aims are to compare gene expression in: a) intestinal mucosal cells obtained by duodenal biopsy, b) sloughed intestinal mucosal cells isolated from feces, and c) peripheral blood mononuclear cells (PBMC) in fasting individuals who are receiving their usual diet + placebo or their usual diet + supplemental zinc (20 mg/d for 7 days). Gene expression values from intestinal mucosal cells (biopsy) will be compared between the placebo and zinc supplemented groups. Similar comparison will be done in the cells isolated from stool and PBMCs. This study will also provide an opportunity to compare the relative responsiveness of gene expression and serum zinc concentration following supplementation and to explore the kinetics of any changes in serum zinc concentration. Thus, blood samples will be obtained for measuring serum zinc concentration on two occasions prior to the interventions and at specified intervals during and after the intervention.

Detailed Description

Not available

Study Timeline

• Study Start: 2007-07-01
• Status Verified: 2010-02
• Study First Submitted: 2010-02-03
• Study First Submitted QC: 2010-02-03
• Study First Posted: 2010-02-04
• Primary Completion: 2010-12-31
• Study Completion: 2010-12-31
• Last Update Submitted: 2017-06-06
• Last Update Posted: 2017-06-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: Not specified

Inclusion Criteria

• Healthy, non-smoking

Exclusion Criteria

• Suffering from diarrhea

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
zinc supplementation (20 mg/d, for 7 d)	Zinc	-

Trial Locations

Locations (1)

Mirpur; 🇧🇩 Dhaka, Bangladesh