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Angling for Thyroid Answers: Study Links PBDEs to Hormone Disruption in Male Sport-Fish Consumers

View Article: PubMed Central

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Levels of polybrominated diphenyl ethers (PBDEs) measured in human samples have increased in recent years, but the health effects of these compounds are not well studied... A new study significantly expands this knowledge base by analyzing PBDE exposure among a large cohort of male sport-fish consumers and concluding that these exposures are associated with increased thyroglobulin antibodies and increased thyroxine (T4) in adult males independent of PCB exposure... Researchers gathered data on the subjects’ levels of fish consumption, medical diseases, and use of medications, and took serum samples that were tested for PBDEs, PCBs, and DDE, a metabolite of DDT that may affect thyroid hormones... Total and free T4 and triiodothyronine (T3) were measured in serum and urine... PBDE concentrations were positively associated with increased T4 and reverse T3, and inversely correlated with total T3 and thyroid-stimulating hormone (TSH)... An observed increase in thyroglobulin antibodies in men with the highest PBDE exposures may indicate an increased susceptibility to autoimmune thyroiditis among people who have been exposed to PBDEs, according to the authors... The findings of a positive association of PBDEs with T4 are not consistent with results of animal studies that have shown decreased T4 in rats and mice exposed to PBDE... However, the results do align with those of several smaller human studies... The authors speculate the disparity may be attributable to the fact that, while thyroid hormone regulation is similar among vertebrates, some functions differ by species... A major strength of the study is the measurement of the effects of PBDEs on multiple hormones and the consideration of other environmental exposures that can affect thyroid hormones... The authors point out that their findings provide a rationale for future mechanistic studies related to PBDE exposure, including how those exposures may be linked to changes in thyroid hormone metabolism and binding of T4 to serum-binding proteins.

No MeSH data available.


EPA data show that contaminant levels in fish from Lake Michigan (above) and the other Great Lakes, while still high, have declined consistently since 1990.
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f1-ehp-116-a532a: EPA data show that contaminant levels in fish from Lake Michigan (above) and the other Great Lakes, while still high, have declined consistently since 1990.


Angling for Thyroid Answers: Study Links PBDEs to Hormone Disruption in Male Sport-Fish Consumers
EPA data show that contaminant levels in fish from Lake Michigan (above) and the other Great Lakes, while still high, have declined consistently since 1990.
© Copyright Policy - public-domain
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2599785&req=5

f1-ehp-116-a532a: EPA data show that contaminant levels in fish from Lake Michigan (above) and the other Great Lakes, while still high, have declined consistently since 1990.

View Article: PubMed Central

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Levels of polybrominated diphenyl ethers (PBDEs) measured in human samples have increased in recent years, but the health effects of these compounds are not well studied... A new study significantly expands this knowledge base by analyzing PBDE exposure among a large cohort of male sport-fish consumers and concluding that these exposures are associated with increased thyroglobulin antibodies and increased thyroxine (T4) in adult males independent of PCB exposure... Researchers gathered data on the subjects’ levels of fish consumption, medical diseases, and use of medications, and took serum samples that were tested for PBDEs, PCBs, and DDE, a metabolite of DDT that may affect thyroid hormones... Total and free T4 and triiodothyronine (T3) were measured in serum and urine... PBDE concentrations were positively associated with increased T4 and reverse T3, and inversely correlated with total T3 and thyroid-stimulating hormone (TSH)... An observed increase in thyroglobulin antibodies in men with the highest PBDE exposures may indicate an increased susceptibility to autoimmune thyroiditis among people who have been exposed to PBDEs, according to the authors... The findings of a positive association of PBDEs with T4 are not consistent with results of animal studies that have shown decreased T4 in rats and mice exposed to PBDE... However, the results do align with those of several smaller human studies... The authors speculate the disparity may be attributable to the fact that, while thyroid hormone regulation is similar among vertebrates, some functions differ by species... A major strength of the study is the measurement of the effects of PBDEs on multiple hormones and the consideration of other environmental exposures that can affect thyroid hormones... The authors point out that their findings provide a rationale for future mechanistic studies related to PBDE exposure, including how those exposures may be linked to changes in thyroid hormone metabolism and binding of T4 to serum-binding proteins.

No MeSH data available.