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| 2. |
- Axmon, Anna, et al.
(author)
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Rapid decline of persistent organochlorine pollutants in serum among young Swedish males
- 2008
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In: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 70:9, s. 1620-1628
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Journal article (peer-reviewed)abstract
- To investigate a possible time trend in serum concentrations of persistent organochlorine pollutants (POPs), representative samples of the young (median age 18 years) Swedish male population were investigated in the years 2000 and 2004. Due to their low age, these men were assumed not to have reached steady state of body burdens of POPs, why their serum concentrations were considered to represent ongoing dietary exposure. Serum concentrations of 2,2',4,4',5,5'-hexachlorobiphenyl (CB-153) and 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethylene (p,p'-DDE), two biomarkers of exposure to POPs, were available for 274 and 223 men, respectively, in 2000 and for 200 men in 2004. The percentage of men with CB-153 or p,p'-DDE below the limit of detection (LOD) was significantly higher in 2004 than in 2000 (30% vs. none, p < 0.001 for CB-153 and 65% vs. 6%, p < 0.001 for p,p'-DDE). Moreover, the median serum concentration of CB-153 decreased from 66ngg(-1) lipid to 19ngg(-1), corresponding to a yearly decrease of about 26%. The analogous analysis was not done for p,p'-DDE since the median serum concentration in 2004 was below the LOD.
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| 3. |
- Rylander, Lars, et al.
(author)
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A simplified precise method for adjusting serum levels of persistent organohalogen pollutants to total serum lipids.
- 2006
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In: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 62:3, s. 333-336
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Journal article (peer-reviewed)abstract
- In order to obtain biomarker values that reflect body burden of persistent organohalogen pollutants (POP), concentrations of lipophilic POP in serum or plasma are generally expressed on a lipid weight basis, and not on a fresh weight basis. There are two different approaches to determine the lipid content in serum and plasma. The gravimetric determination is more expensive, and longer experience is needed as compared with the preferable enzymatic determination. Clinical chemistry laboratories at most hospitals perform enzymatic determinations of cholesterol and triglycerides on a routine basis, whereas analysis of phospholipids is not part of these analyses. In the present study, therefore, we evaluated the association between the sum of measured triglyceride, cholesterol, and phospholipid levels in serum among 617 individuals with the sum of only triglyceride and cholesterol levels. There was a very strong linear association between the sums of serum concentrations of triglycerides and cholesterols and the total lipid concentrations. As much as 97.2% of the variation in total lipid concentrations was explained by the sum of the triglyceride and cholesterol concentrations, with the following regression: Total lipid = 0.9 + 1.3 * (Cholesterol + Triglycerides). Almost identical relationships were recorded in subgroups with men, women and subjects of different age. Thus, total lipid concentrations in blood serum can be accurately estimated by analyzing only cholesterol and triglycerides in the matrix. (c) 2005 Elsevier Ltd. All rights reserved.
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| 4. |
- Rylander, Lars, et al.
(author)
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Associations between CB-153 and p,p'-DDE and hormone levels in serum in middle-aged and elderly men.
- 2006
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In: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 65:3, s. 375-381
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Journal article (peer-reviewed)abstract
- Background: Animal and epidemiologic data indicate that exposure to persistent organochlorine pollutants (POPs) may disrupt the hypothalamus-pituitary-thyroid (HPT) and the hypothalamus-pituitary-gonadal (HPG) axes. We have assessed whether the POP-biomarkers 2,2'4,4',5,5'-hexachlorobiphenyl (CB-153) and 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethene (p,p'-DDE) affect thyrotropin (TSH), thyroid hormones, gonadotropins or sex hormone concentrations in men. Methods: Lipid adjusted serum concentrations of CB-153, and p,p'-DDE, were determined in 196 men (median age 59 years, range 48-82). Hormone analyses in serum were performed with immunoassays. The effect of CB-153 and p,p'-DDE (as continuous or categorized variables) were evaluated by linear regression models, adjusting for potential confounders. Results: There was a significant positive association between p,p'-DDE and TSH. An increase of 100 ng/g lipid of p,p'-DDE corresponded to an increase of 0.03 mU/l (95% Confidence Interval (CI) 0.01, 0.05) in TSH level. The explanatory value (R 2) of the multi-variate model was only 7%. Moreover, there was a significant negative association between p,p'-DDE and estradiol. An increase of 100 ng/g lipid of p,p'-DDE corresponded to a decrease of 0.57 pmol/l (95% CI -1.0, -0.12) in estradiol level. The R-2-value was only 4%. No associations were observed between any of the POP biomarkers and the other hormones. Conclusions: The positive association between p,p'-DDE and TSH and the negative association between p,p'-DDE and estradiol, among middle-aged and elderly men, were not accompanied by associations between the POP-markers and thyroxin, testosterone, and gonadotropins, respectively. The results gives some additional support for that POP exposure may affect HPT- and HPG-axes also in humans, but the overall epidemiological data are still not coherent enough to allow any firm conclusions. (c) 2006 Elsevier Ltd. All rights reserved.
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| 5. |
- Rylander, Lars, et al.
(author)
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Intra-individual variations and temporal trends in dioxin levels in human blood 1987-2002
- 2009
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In: Chemosphere. - Oxford : Pergamon Press. - 0045-6535 .- 1879-1298. ; 76:11, s. 1557-1562
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Journal article (peer-reviewed)abstract
- Objectives: In Sweden, an important source for exposure to persistent organochlorine pollutants, such as PCDD and PCDF, is through intake of fatty fish from the Baltic Sea off the Eastern coast of Sweden. The present study assesses temporal trends for human levels of PCDD/F between 1987 and 2002 among 26 men from Sweden. In addition, we investigate the impact of potential determinants (age, relative change in BMI and fish consumption) on the relatively change in individual PCDD/F congener levels between 1987 and 2002. Methods: In 1987, nine of the men did not eat fatty fish from the Baltic Sea, eight had a moderate intake, and nine were high consumers. For the same individuals,blood samples were collected in 1987 as well as in 2002, and the concentrations of seven PCDD and 10 PCDF congeners were analyzed at the same laboratory. Results: The WHO-TEQ levels for PCDD/F did not significantly change over the 15-year period. There were, however, some specific congeners that significantly had changed over time. None of the investigated determinants were associated with the change over time for the specific PCDD/F congeners. Conclusion: The present study may be of importance for risk assessment and setting standards for food contamination with PCDD/F, especially regarding intake of fatty fish from the Baltic Sea.
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| 6. |
- Rylander, Lars, et al.
(author)
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Weight and height at 4 and 7 years of age in children born to mothers with a high intake of fish contaminated with persistent organochlorine pollutants.
- 2007
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In: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 67:3, s. 498-504
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Journal article (peer-reviewed)abstract
- In Sweden the main exposure route for persistent organochlorine pollutants (POP) is through consumption of fatty fish from the Baltic Sea (off the eastern coast). The present study aimed to investigate whether intrauterine exposure for POP may have negative impact on children's weight and height at 4 and 7 years of age, respectively. The study included 174 fishermen's wives from the Swedish east coast who had given birth to an infant with either low (n = 55) or normal (n = 119) birth weight, and 88 and 206 corresponding women from the Swedish west coast (where the fish is less polluted). Comparisons between the east and west coast cohorts were performed. In addition, blood samples were collected among the cast coast women and the concentrations of 2,2',4,4',5,5'-hexachlorobiphenyl (CB-153) in plasma was analyzed and estimated for the year of childbirth. There were no significant differences between the east and west coast cohorts regarding weight and height at 4 and 7 years of age. There were, however, significant negative associations between the estimated plasma concentrations of CB-153 during year of childbirth and weight at 4 and 7 years of age, respectively, among the normal birth weight children. The study gives only very weak support for the hypothesized association.
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| 7. |
- Thuresson, Kaj, et al.
(author)
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Polybrominated diphenyl ether exposure to electronics recycling workers - a follow up study
- 2006
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In: Chemosphere. - : Elsevier BV. - 1879-1298 .- 0045-6535. ; 64:11, s. 1855-1861
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Journal article (peer-reviewed)abstract
- Workers at an electronics recycling plant have previously been shown to have elevated serum levels of polybrominated diphenyl ethers (PBDEs) compared to referents without occupational PBDE exposure. Subsequent structural changes and industrial hygiene measures at the plant were applied to improve the work environment. The present study aims to assess the impact of these work environment changes on the occupational exposure to PBDEs. Blood were drawn from the workers and analyzed at two different laboratories, and serum concentrations of several PBDE congeners were determined by GC/MS or GC/HRMS. Cross-sectional studies were performed prior to (in 1997; N = 19) and after (in 2000; N = 27) workplace improvements. Longitudinal studies were performed on twelve of the workers that were sampled at both occasions. Even though the amount of processed goods had doubled in 2000 as compared to 1997, there was a significant decrease in the serum levels of BDE-183 and BDE-209. For BDE-209 the levels observed in year 2000 were even lower than in referents with no occupational exposure. In contrast to the decrease of higher brominated diphenyl ethers, the concentrations of BDE-47 did not significantly change. For BDE-153, the cross-sectional study indicated no change, whereas the longitudinal follow up indicated a significant increase. This study shows that the industrial hygiene improvements clearly reduced the occupational exposure to BDE-183 and BDE-209 at the plant. Still, the levels of hexa- to nonaBDEs but not BDE-209 were elevated, compared to referents with no occupational exposure. (c) 2006 Elsevier Ltd. All rights reserved.
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| 8. |
- Jakobsson, Kristina, et al.
(author)
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Exposure to polybrominated diphenyl ethers and tetrabromobisphenol A among computer technicians.
- 2002
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In: Chemosphere. - 1879-1298. ; 46:5, s. 709-716
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Journal article (peer-reviewed)abstract
- This study investigates exposure to polybrominated diphenyl ethers (PBDEs) and tetrabromobisphenol A (TBBPA), which are used as flame retardants in electronic equipment, in a group of technicians with intense computer work. Thirteen PBDE congeners and TBBPA were quantified in serum from 19 computer technicians. Previously investigated groups of hospital cleaners with no computer experience, and clerks working full-time at computer screens were used for comparison. The computer technicians had serum concentrations of BDE-153, BDE-183 and BDE-209 that were five times higher than those reported among hospital cleaners and computer clerks. The median levels observed among the computer technicians were 4.1, 1.3, and 1.6 pmol/g lipid weight, respectively. In contrast, for BDE-47 there was no difference between the computer technicians and the others. BDE-100, BDE-203, and three structurally unidentified octa-BDEs and three nona-BDEs, were present in almost all samples from the computer technicians. Further, TBBPA was detected in 8 out of 10 samples. The levels of BDE-153, BDE-183, and one of the octa-BDEs were positively correlated with duration of computer work among technicians. On a group level an exposure gradient was observed, from the least exposed cleaners to the clerks, and to the highest exposed group of computer technicians. A dose (duration of computer work)-response relationship among computer technicians was demonstrated for some higher brominated PBDE congeners. Thus, it is evident that PBDEs used in computers and electronics, including the fully brominated BDE-209, contaminate the work environment and accumulate in the workers tissues.
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