Download the full-sized PDF
Permanent link (DOI): https://doi.org/10.7939/R36Q1ST4J
This file is in the following communities:
|Biological Sciences, Department of|
This file is in the following collections:
|Journal Articles (Biological Sciences)|
Relationships between PCBs and Thyroid Hormones and Retinol in Female and Male Polar Bears Open Access
- Author or creator
Derocher, Andrew E.
Sørmo, Eugen G.
Skaare, Janneche U.
Jenssen, Bjørn Munro
- Additional contributors
- Type of item
- Journal Article (Published)
We studied the relationships between polychlorinated biphenyls (PCBs) and thyroid hormones (THs) and retinol within two groups of female polar bears (Ursus maritimus), females with cubs of the year (FWCOY) and females without cubs of the year (FWOCOY), and within a group of males. Concentrations of five of the six quantified PCB congeners, i.e., PCB-99, PCB-153, PCB-156, PCB-180, PCB-194 (ΣPCB5), correlated with each other, whereas the concentrations of PCB-118 did not correlate with the other congeners. ΣPCB5 and PCB-118 did not differ between the three different groups of polar bears, and the plasma levels ranged from 16.7 to 203.2 ng/g wet weight (ww) for ΣPCB5 and from 0.09 to 0.93 ng/g ww for PCB-118. PCBs did not affect the retinol status in any of the three groups. In FWCOY, we found negative correlations between ΣPCB5 and the three TH variables free thyroxin (FT4) (r2 = 0.35), free triiodothyronine (FT3) (r2 = 0.30), and the total T4:total T3 ratio (TT4:TT3) (r2 = 0.92). In FWOCOY, ΣPCB5 was negatively correlated to TT4 (r2 = 0.14) and positively correlated to TT3:FT3 (r2 = 0.31), whereas PCB-118 was positively correlated to FT3 (r2 = 0.21) and negatively correlated to TT3:FT3 (r2 = 0.26). In males, ΣPCB5 was negatively correlated to FT3 (r2 = 0.56) and positively correlated to FT4:FT3 (r2 = 0.78), whereas PCB-118 was negatively correlated to FT4:FT3 (r2 = 0.53). Thus, PCBs affected five TH variables in the female polar bears (TT4, FT4, FT3, TT3:FT3, TT4:TT3), but PCBs affected only two TH variables in males (FT3, FT4:FT3). Female polar bears could be more susceptible to TH-related effects of PCBs than are males. PCBs also affected T3 to a larger degree than T4. Key words: Arctic, endocrine disruption, hypothyroid, pollution, Svalbard, Ursus maritimus.
- Date created
- License information
- Reproduced with permission from Environmental Health Perspectives. This item is open access. The source and author(s) must be cited.
- Citation for previous publication
Marte Braathen, Andrew E. Derocher, Øystein Wiig, Eugen G. Sørmo, Elisabeth Lie, Janneche U. Skaare and Bjørn Munro Jenssen. Relationships between PCBs and Thyroid Hormones and Retinol in Female and Male Polar Bears.
Environmental Health Perspectives , Vol. 112, No. 8 (Jun., 2004), pp. 826-833
- Link to related item
- Date Uploaded
- Date Modified
- Audit Status
- Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 161791
Last modified: 2015:10:12 18:32:41-06:00
Original checksum: 96655457e1abf3a4d6b00bc441dd1aff
Well formed: true
File title: workingsci1.qk
File title: workingsci1.qk
File author: Heather Valli
Page count: 8