These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Zinc deficiency enhances the induction of micronuclei and 8-hydroxy-2'-deoxyguanosine via superoxide radical in bone marrow of zinc-deficient rats. Author: Kawasaki I, Suzuki Y, Yanagisawa H. Journal: Biol Trace Elem Res; 2013 Jul; 154(1):120-6. PubMed ID: 23712836. Abstract: The aim of the present study was to examine whether zinc (Zn) deficiency augmented the frequency of micronuclei, an indicator of chromosome aberration, and the induction of 8-hydroxy-2'-deoxyguanosine (8-OHdG), a marker of cellular DNA damage derived from oxidative stress, in rat bone marrow cells or not. Both the frequency of micronuclei and the induction of 8-OHdG were significantly increased in rats fed with a Zn-deficient versus a standard diet for 6 weeks (p < 0.005). The supplementation of Zn with a standard diet for 4 weeks to rats fed with a Zn-deficient diet for 6 weeks restored the enhanced induction of micronuclei and 8-OHdG to levels comparable to those seen in rats fed with a standard diet for 10 weeks, indicating that the shortage of Zn in the body is involved in the induction of micronuclei and 8-OHdG. Again, the membrane-permeable superoxide dismutase mimetic superoxide scavenger, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl, treatment (100 μmol/kg, twice a day) for 10 days prior to the termination of dietary treatment reduced the induction of micronuclei and 8-OHdG in rats fed with a Zn-deficient diet for 6 weeks to levels comparable to those in rats fed with a standard diet for 6 weeks, indicating that superoxide radical participates in the induction of micronuclei and 8-OHdG. In fact, the endogenous superoxide scavenger, Cu/Zn superoxide dismutase, was significantly reduced in the bone marrow cells of rats fed with a Zn-deficient diet for 6 weeks when compared to those of rats fed with a standard diet for 6 weeks (p < 0.005). These observations demonstrate that Zn deficiency elevates the frequency of micronuclei and the induction of 8-OHdG through an increase in the biological action of the superoxide radical. This suggests an increase in carcinogenic initiation resulting from Zn deficiency-induced oxidative stress.[Abstract] [Full Text] [Related] [New Search]