Chromium III Histidinate Exposure Modulates Gene Expression in HaCaT Human Keratinocytes Exposed to Oxidative Stress
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Abstract
While the toxicity of hexavalent chromium is well established, trivalent chromium is an essential nutrient involved in insulin and glucose homeostasis. To study the antioxidant effects of Cr(III)His, cDNA arrays were used to investigate the modulation of gene expression by trivalent chromium histidinate (Cr(III)His) in HaCaT human keratinocytes submitted to hydrogen peroxide (H2O2). Array was composed by a set of 81 expressed sequences tags (ESTs) essentially represented by antioxidant and DNA repair genes. HaCaT were preincubated for 24 h with 50 μM Cr(III)His and were treated with 50 μM H2O2. Total RNAs were isolated immediately or 6 h after the stress. In Cr(III)His preincubated cells, transcripts related to antioxidant family were upregulated (glutathione synthetase, heme oxygenase 2, peroxiredoxin 4). In Cr(III)His preincubated cells and exposed to H2O2, increased expressions of polymerase delta 2 and antioxidant transcripts were observed. Biochemical methods performed in parallel to measure oxidative stress in cells showed that Cr(III)His supplementation before H2O2 stress protected HaCaT from thiol groups decrease and thiobarbituric acid reactive substances increase. In summary, these results give evidence of antioxidant gene expression and antioxidant protection in HaCaT preincubated with Cr(III)His and help to explain the lack of toxicity reported for Cr(III)His.
Keywords
Oxidative stress Hydrogen peroxide Cr(III)His supplementation Gene expression HaCaT TBARS Thiol groupsAbbreviations
- 8-oxodGuo
8-Oxo-7-8-dihydro-2′-deoxyguanosine
- ACTB
Actin, beta
- ANOVA
Analysis of variance
- Cr
Chromium
- Cr(III)
Trivalent chromium
- Cr(III)His
Trivalent chromium histidinate
- Cr(VI)
Hexavalent chromium
- DMSO
Dimethylsulfoxide
- DTNB
5,5′-Dithio-Bis (2-nitrobenzoic acid)
- ECM
Extracellular matrix
- ESTs
Expressed sequence tags
- GADD45A
Growth arrest and DNA-damage-inducible alpha
- GAPDH
Glyceraldehyde-3-phosphate dehydrogenase
- GCLM
Glutamate-cysteine ligase, modifier subunit
- GPX1
Glutathione peroxidase 1
- GSH
Glutathione
- GSR
Glutathione reductase
- GSS
Glutathione synthetase
- GST
Glutathione S-transferase
- H2O2
Hydrogen peroxide
- HMOX2
Heme oxygenase 2
- IKBIA
Nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor, alpha
- MMP2
Matrix metallopeptidase 2
- MTT
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NAC
N-acetyl cysteine
- NER
Nucleotide excision repair
- NFKB1
Nuclear factor of kappa light polypeptide gene enhancer in B-cells 1
- NHEJ
Non-homologous end-joining
- PBS
Phosphate-buffered saline
- PCR
Polymerase chain reaction
- PLA2G5
Phospholipase A2, group V
- POLD2
Polymerase delta 2
- PRDX4
Peroxiredoxin 4
- ROS
Reactive oxygen species
- RPL32
Ribosomal protein L32
- SE
Standard error
- -SH
Thiol groups
- SHC1
Src homology 2 domain containing transforming protein 1
- SOD1
Superoxide dismutase 1
- TBARS
Thiobarbituric acid reactive substances
- TXN
Thioredoxin
- XPC
Xeroderma pigmentosum C
Notes
Acknowledgements
This study was part of a US Department of Agriculture funded study entitled “Insulin potentiating compounds and antioxidant nutrients in the prevention and alleviation of glucose intolerance and diabetes” and the International Agreement between laboratories from Joseph Fourier University, Grenoble, France and the Beltsville Human Nutrition Research Center entitled “Naturally Occurring Insulin Enhancing Factors”.
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