Competitive reverse transcriptase-polymerase chain reaction shows that dietary zinc supplementation in humans increases monocyte metallothionein mRNA levels

Zinc status is difficult to evaluate in humans. Metallothionein gene expression is transcriptionally regulated by dietary zinc and thus could serve as an assessment parameter based on zinc-dependent function. We used semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR) to establ...

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Veröffentlicht in:The Journal of nutrition Jg. 127; H. 5; S. 694
Hauptverfasser: Sullivan, V K, Cousins, R J
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States 01.05.1997
Schlagworte:
Adult
Analysis of Variance
Base Sequence
Blotting, Northern
Cell Separation
Cells, Cultured
DNA, Complementary - analysis
DNA, Complementary - chemistry
DNA, Complementary - genetics
Electrophoresis, Polyacrylamide Gel
Flow Cytometry - methods
Food, Fortified
Gene Expression Regulation
Gene Expression Regulation, Neoplastic
Humans
Leukemia, Myeloid - blood
Leukemia, Myeloid - metabolism
Leukemia, Myeloid - pathology
Male
Metallothionein - drug effects
Metallothionein - genetics
Metallothionein - metabolism
Monocytes - chemistry
Monocytes - drug effects
Monocytes - metabolism
Polymerase Chain Reaction - methods
RNA, Messenger - analysis
RNA, Messenger - genetics
RNA, Messenger - metabolism
RNA-Directed DNA Polymerase
Tumor Cells, Cultured
Zinc - administration & dosage
Zinc - blood
Zinc - pharmacology
ISSN:0022-3166
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Zusammenfassung:Zinc status is difficult to evaluate in humans. Metallothionein gene expression is transcriptionally regulated by dietary zinc and thus could serve as an assessment parameter based on zinc-dependent function. We used semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR) to establish that MT mRNA is increased in a human monocytic cell line by addition of zinc to the medium. To examine this response in human subjects, a dietary supplement of 50 mg zinc gluconate/d was given for 15 d. Monocytes were purified from venous blood using NycoPrep 1.068. Monocyte purity was determined by flow cytometry using fluorescent anti-human monocyte CD14 antibodies. Total monocyte RNA was extracted and converted to cDNA by reverse transcription. Competitive RT-PCR was used to analyze differences between cDNA levels that are proportional to MT mRNA levels in monocytes from zinc-supplemented and control subjects. RT-PCR oligonucleotide primers were designed to amplify both a 201 bp segment of the human MT cDNA and a 180 bp competitor cDNA template. The 180 bp competitor cDNA template was used for MT cDNA quantitation. The RT-PCR data show that there was a significant increase in monocyte MT mRNA in subjects within 6 d of zinc supplementation, which remained elevated at d 15 of supplementation. In contrast, plasma zinc was greater at d 6 of zinc supplementation, but by d 15 of supplementation, while still elevated, was close to control levels. These data suggest that monocyte MT mRNA levels respond to zinc supplementation and that the response could serve as a more useful assessment variable than plasma zinc for the measurement of zinc status in humans.
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ISSN:0022-3166
DOI:10.1093/jn/127.5.694