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Hydroxylated polychlorinated biphenyls decrease circulating steroids in female polar bears (Ursus maritimus).

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Environmental Research
|March 1, 2015
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Summary
This summary is machine-generated.

Persistent organic pollutants (POPs) like hydroxylated PCBs may disrupt steroid hormone levels in female polar bears. This interference with steroid homeostasis could potentially impact polar bear reproduction, especially alongside climate change.

Keywords:
POPsPolar bearsSteroid hormones

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Area of Science:

  • Environmental Toxicology
  • Endocrinology
  • Arctic Wildlife Biology

Background:

  • Polar bears (Ursus maritimus), as apex Arctic predators, accumulate high levels of persistent organic pollutants (POPs).
  • Certain POPs are known to interfere with endocrine pathways, specifically steroidogenesis, potentially affecting reproductive functions like fertility and implantation.
  • Understanding POPs' impact on polar bear reproduction is crucial due to their ecological role and vulnerability to environmental changes.

Purpose of the Study:

  • To investigate the associations between circulating levels of specific POPs and their metabolites (OH-PCBs, OH-PBDEs) and steroid hormone concentrations in female polar bears.
  • To explore potential links between POP exposure, steroid hormone levels, and reproductive health indicators in this vulnerable species.

Main Methods:

  • Blood samples were collected from 15 female polar bears in Svalbard, Norway.
  • Concentrations of nine key steroid hormones (DHEA, AN, TS, DHT, E1, αE2, βE2, PRE, PRO) were measured.
  • Circulating levels of specific POP compounds and POP-metabolites (OH-PCBs, OH-PBDEs) were quantified and correlated with hormone levels and biological variables.

Main Results:

  • Inverse correlations were observed between circulating pregnenolone (PRE) and androstenedione (AN) levels and hydroxylated PCBs (OH-PCBs).
  • No significant relationships were found between steroid concentrations and other POPs, capture data, or physical condition variables.
  • Findings suggest OH-PCBs may influence AN and PRE levels, potentially interfering with steroid homeostasis and indicating CYP17 as a possible target enzyme.

Conclusions:

  • Hydroxylated PCBs (OH-PCBs) may negatively affect circulating levels of androstenedione (AN) and pregnenolone (PRE) in female polar bears.
  • This disruption of steroid homeostasis by OH-PCBs could interfere with reproductive processes.
  • Combined with climate change and other stressors, OH-PCB exposure may pose a significant threat to the reproductive potential of polar bear populations.