2007
DOI: 10.1016/j.freeradbiomed.2007.02.034
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Safety of trivalent chromium complexes: No evidence for DNA damage in human HaCaT keratinocytes

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Cited by 51 publications
(49 citation statements)
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“…Similar to Cr(VI), oxidative stress, and namely the generation of OH • via a Fenton-driven reaction with hydrogen peroxide, has been indicated as one of the mechanisms responsible for Cr(III)-mediated DNA damage (Valavanidis et al, 2005); the reduction in DNA adduct formation (isolated calf thymus DNA) caused by the combined exposure to Cr(III)-H 2 O 2 and various free radical scavengers would lend further support to this hypothesis. However, in vitro experiments with human keratinocytes performed with various Cr(III) supplements (histidinate, picolinate and chloride) did not disclose oxidative DNA damage but even pointed to a protective (antioxidant) effect brought about by the metal when cells were concomitantly exposed to hydrogen peroxide (Hininger et al, 2007). The role of the oxidative stress in the Cr(VI)-Cr(III)-mediated mutagenicity was also previously questioned by other researchers (Zhitkovich et al, 2001 bw); however, the concentrations measured in the embryos (8 to 20 μg kg -1 ) were of the same order of magnitude as those normally found in tissues (liver, kidney) of food-producing species fed with Cr(III)-supplemented diets.…”
Section: Genotoxicity and Carcinogenicitymentioning
confidence: 95%
“…Similar to Cr(VI), oxidative stress, and namely the generation of OH • via a Fenton-driven reaction with hydrogen peroxide, has been indicated as one of the mechanisms responsible for Cr(III)-mediated DNA damage (Valavanidis et al, 2005); the reduction in DNA adduct formation (isolated calf thymus DNA) caused by the combined exposure to Cr(III)-H 2 O 2 and various free radical scavengers would lend further support to this hypothesis. However, in vitro experiments with human keratinocytes performed with various Cr(III) supplements (histidinate, picolinate and chloride) did not disclose oxidative DNA damage but even pointed to a protective (antioxidant) effect brought about by the metal when cells were concomitantly exposed to hydrogen peroxide (Hininger et al, 2007). The role of the oxidative stress in the Cr(VI)-Cr(III)-mediated mutagenicity was also previously questioned by other researchers (Zhitkovich et al, 2001 bw); however, the concentrations measured in the embryos (8 to 20 μg kg -1 ) were of the same order of magnitude as those normally found in tissues (liver, kidney) of food-producing species fed with Cr(III)-supplemented diets.…”
Section: Genotoxicity and Carcinogenicitymentioning
confidence: 95%
“…Крім цього, встановлено, що хлорид хрому може інгібувати утво рення Н 2 О 2 , який пригнічує діяльність СОД [18,19].…”
Section: +unclassified
“…However, recent studies have questioned the safety of certain supplemental trivalent Cr complexes (26). Comparative studies of chromium(III) picolinate and niacin-bound chromium(III), two popular dietary supplements, have revealed that chromium(III) picolinate produces significantly more oxidative stress and DnA damage (27)(28)(29)(30).…”
Section: Evaluation Of Insulin Binding and Signaling Activity Of Newlmentioning
confidence: 99%