Cadmium, mercury, and lead in kidney cortex are not associated with urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) in living kidney donors. 2014

Mohammad Bakhtiar Hossain, and Lars Barregard, and Gerd Sallsten, and Karin Broberg
Division of Occupational and Environmental Medicine, Department of Laboratory Medicine, Lund University, SE 22185, Lund, Sweden, Bakhtiar.Hossain@med.lu.se.

OBJECTIVE Cadmium in urine is positively associated with urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) concentrations, a sensitive marker of oxidative DNA damage. We determined whether kidney concentrations of cadmium, mercury, and lead, which may generate oxidative DNA damage, were associated with urinary 8-oxodG or not. METHODS 8-OxodG was measured in separate 24 h and overnight urine samples from Swedish healthy adult kidney donors (N = 152) using LC-MS/MS. Concentrations of metals were measured in kidney biopsies (N = 109) by ICP-MS. RESULTS The median 8-oxodG concentrations (adjusted to specific gravity) in 24 h and overnight samples were 13.5 and 15.3 nmol/L; 8-oxodG excretion rates in 24 h and overnight samples were 0.93 and 0.86 nmol/h. In multivariable linear regression analyses, we did not find any association between 8-oxodG concentrations or rates and elements in the kidney. The 24-h 8-oxodG concentrations were positively associated with serum ferritin (β = 0.048, p < 0.0001), body weight (β = 0.13, p = 0.0019), and inversely with gender (β = -3.34, p = 0.0024). Similar associations with 8-oxodG excretion rates were stronger. Smoking was positively associated with 24-h 8-oxodG excretion rates (β = 0.26, p = 0.0090), but not with overnight samples. CONCLUSIONS Neither cadmium, nor mercury or lead in the kidney contributed to urinary 8-oxodG concentrations in non-occupationally exposed subjects. The iron status was positively associated with urinary 8-oxodG, particularly in women.

UI MeSH Term Description Entries
D007501 Iron A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN. Iron-56,Iron 56
D007668 Kidney Body organ that filters blood for the secretion of URINE and that regulates ion concentrations. Kidneys
D007854 Lead A soft, grayish metal with poisonous salts; atomic number 82, atomic weight 207.2, symbol Pb.
D008297 Male Males
D008628 Mercury A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D002104 Cadmium An element with atomic symbol Cd, atomic number 48, and atomic weight 112.41. It is a metal and ingestion will lead to CADMIUM POISONING.
D003849 Deoxyguanosine A nucleoside consisting of the base guanine and the sugar deoxyribose.
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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