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Title: Telomere length in children environmentally exposed to low-to-moderate levels of lead

Shorter relative telomere length in peripheral blood is a risk marker for some types of cancers and cardiovascular diseases. Several environmental hazards appear to shorten telomeres, and this shortening may predispose individuals to disease. The aim of the present cross-sectional study was to assess the effect of environmental exposure to lead on relative telomere length (rTL) in children. A cohort of 99 8-year-old children was enrolled from 2007–2010. Blood lead concentrations (B-Pb) were measured by graphite furnace atomic absorption spectrometry, and blood rTL was measured by quantitative PCR. The geometric mean of B-Pb was 3.28 μg/dl (range: 0.90–14.2), and the geometric mean of rTL was 1.08 (range: 0.49–2.09). B-Pb was significantly inversely associated with rTL in the children (r{sub S} = − 0.25, p = 0.013; in further analyses both log-transformed-univariate regression analysis β = − 0.13, p = 0.026, and R{sup 2}adj 4%; and β = − 0.12, p = 0.056 when adjusting for mothers' smoking during pregnancy, Apgar score, mother's and father's ages at delivery, sex and mother's education, R{sup 2}adj 12%, p = 0.011). The effect of lead remained significant in children without prenatal tobacco exposure (N = 87, r{sub S} = − 0.24, p = 0.024;more » in further analyses, β = − 0.13, p = 0.029, and R{sup 2}adj 4%). rTL was not affected by sex, the concentrations of other elements in the blood (i.e., cadmium and selenium concentrations), or oxidative injury parameters (total antioxidant status, 8-hydroxydeoxyguanosine and thiobarbituric acid-reactive substances). Lead exposure in childhood appears to be associated with shorter telomeres, which might contribute to diseases, such as cardiovascular disease. The inverse association between blood lead level and the telomeres in children emphasizes the importance of further reducing lead levels in the environment. - Highlights: • This cross-sectional study analyzes the association between environmental lead exposure and telomere length in children. • Blood lead concentrations were inversely associated with relative telomere length in 8-year-old children. • Environmental lead exposure during childhood might contribute to telomere shortening, and in turn, future risk for disease.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Institute of Occupational Medicine and Environmental Health, PL 41-200 Sosnowiec (Poland)
  2. Department of Animal Physiology and Ecotoxicology, University of Silesia, Bankowa str. 9, 40-007 Katowice (Poland)
  3. Institute of Environmental Medicine, Unit of Metals & Health, Box 210, SE-171 77 Stockholm (Sweden)
  4. Department of Biochemistry, Medical University of Silesia, Katowice, SMDZ in Zabrze, 41-808 Zabrze (Poland)
Publication Date:
OSTI Identifier:
22465811
Resource Type:
Journal Article
Resource Relation:
Journal Name: Toxicology and Applied Pharmacology; Journal Volume: 287; Journal Issue: 2; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; ABSORPTION SPECTROSCOPY; ANTIOXIDANTS; BLOOD; CADMIUM; CARDIOVASCULAR DISEASES; CHILDREN; ENVIRONMENTAL EXPOSURE; HAZARDS; INJURIES; LENGTH; NEOPLASMS; OXIDATION; PREGNANCY; PRENATAL EXPOSURE; REGRESSION ANALYSIS; SELENIUM; SMOKES; TELOMERES; TOBACCO