Evidence for thyroid endocrine disruption in wild fish in San Francisco Bay, California, USA. Relationships to contaminant exposures

被引:82
作者
Brar, Navdeep K. [1 ]
Waggoner, Claire [1 ]
Reyes, Jesus A. [2 ]
Fairey, Russell [3 ]
Kelley, Kevin M. [1 ]
机构
[1] Calif State Univ Long Beach, Dept Biol Sci, Environm Endocrinol Lab, Long Beach, CA 90840 USA
[2] Pacific Coast Environm Conservancy, Taft, CA 93268 USA
[3] Moss Landing Marine Labs, Marine Pollut Studies Lab, Moss Landing, CA 95039 USA
关键词
Thyroid; Endocrine disruption; Thyroxine; Aquatic contaminant; Fish; PCB; POLYCHLORINATED-BIPHENYLS PCBS; ENVIRONMENTAL CONTAMINANTS; HORMONE; CHEMICALS; RESPONSES; GROWTH; TRANSTHYRETIN; DEIODINATION; AROCLOR-1254; MECHANISMS;
D O I
10.1016/j.aquatox.2009.10.023
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
It is well documented that many coastal and estuarine environments adjacent to developed and industrialized urban centers, such as the San Francisco Bay Area, are significantly contaminated by anthropogenic chemicals. However, it is not well understood to what extent existing contaminants, many with continuing inflows into the environment, may impact exposed wildlife. This study provided an initial characterization of thyroid endocrine-related effects and their relationship to accumulated contaminants in two indigenous fish species sampled from different San Franicsco Bay Area study sites. Plasma concentrations of thyroxine (T4) were significantly reduced in fish sampled from highly impacted locations such as Oakland Inner Harbor and San Leandro Bay as compared with fish from other locations representing relatively lower human impact, including Bodega Bay, Redwood City and a remote site on Santa Catalina Island. Triiodothyronine (T3) levels also varied significantly by location, with differing T3/T4 ratios in fish from some locations suggestive of altered peripheral deiodinase activity. The changes in thyroid endocrine parameters were significantly correlated with hepatic concentrations of certain environmental contaminants. A large number of polychlorinated biphenyl (PCB) congeners, both co-planar (dioxin-like) and non-co-planar, exhibited significant inverse correlations with T4 levels in the fish, while in contrast, T3 and T3/T4 ratio were positively correlated with PCB exposures. The positive correlation between T3/T4 ratio and PCBs supports the hypothesis that environmental PCBs may alter T4 deiodination or turnover, actions of PCBs reported in laboratory experiments. Some relationships between chlorinated pesticides including DDT and chlordanes, but fewer relationships with PAHs, were also observed. Together, these findings indicate that the thyroid endocrine system is exhibiting alterations associated with different aquatic environments in the San Francisco Bay Area, which are significantly related to current-day exposures of the fish to contaminant chemicals such as PCBs. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:203 / 215
页数:13
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