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Article

Thyroid-Stimulating Hormone Stimulation Tests in the Bottlenose Dolphin (Tursiops truncatus)

1
National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, CA 92106, USA
2
Department of Biology, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94928, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Lance Miller
J. Zool. Bot. Gard. 2021, 2(2), 265-272; https://doi.org/10.3390/jzbg2020018
Received: 1 May 2021 / Revised: 20 May 2021 / Accepted: 21 May 2021 / Published: 26 May 2021
(This article belongs to the Special Issue Cetaceans: Conservation, Health, and Welfare)
Stimulation of the thyroid with thyroid-stimulating hormone (TSH) is a potentially useful diagnostic of thyroid dysfunction, but little is known about the response of the thyroid to TSH stimulation in bottlenose dolphins (Tursiops truncatus). To better characterize the response of the dolphin thyroid to TSH stimulation, five adult dolphins participated in a TSH stimulation study. Dolphins voluntarily beached onto a padded mat and were given a 1.5 mg intramuscular injection of human recombinant TSH. Blood samples collected the day prior, at multiple intervals the day of, and daily for three days after the injection were analyzed via radioimmunoassay for free and total triiodothyronine (fT3 and tT3), and free and total thyroxine (fT4 and tT4). Significant increases in circulating fT3, fT4, and tT4 were observed with peaks occurring for all hormones the day after the TSH injection; maximal increases were 44%, 47%, and 23% for each hormone, respectively. Temporal patterns in the hormones potentially reflected feedback mechanisms countering the surge in fT3 following stimulation. Though recombinant human TSH was effective at stimulating hormone release, it is likely that use of dolphin or dolphin-derived TSH would enhance the clinical utility of the stimulation test, as would the development of antibodies specific to dolphin TSH. View Full-Text
Keywords: thyroid stimulation; thyroxine; triiodothyronine; cetacean thyroid stimulation; thyroxine; triiodothyronine; cetacean
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MDPI and ACS Style

Houser, D.S.; Champagne, C.; Crocker, D.E. Thyroid-Stimulating Hormone Stimulation Tests in the Bottlenose Dolphin (Tursiops truncatus). J. Zool. Bot. Gard. 2021, 2, 265-272. https://doi.org/10.3390/jzbg2020018

AMA Style

Houser DS, Champagne C, Crocker DE. Thyroid-Stimulating Hormone Stimulation Tests in the Bottlenose Dolphin (Tursiops truncatus). Journal of Zoological and Botanical Gardens. 2021; 2(2):265-272. https://doi.org/10.3390/jzbg2020018

Chicago/Turabian Style

Houser, Dorian S., Cory Champagne, and Daniel E. Crocker. 2021. "Thyroid-Stimulating Hormone Stimulation Tests in the Bottlenose Dolphin (Tursiops truncatus)" Journal of Zoological and Botanical Gardens 2, no. 2: 265-272. https://doi.org/10.3390/jzbg2020018

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