AI Article Synopsis
- Thyroid hormones are crucial for the metamorphosis of anuran (frogs) and flatfish, driving this developmental change.
- The study investigates the regulation of flatfish metamorphosis, focusing on the hypothalamus-pituitary-thyroid (HPT) axis, emphasizing differences in teleosts compared to other vertebrates.
- Results indicate that the traditional regulatory hormones, thyroid releasing hormone (trh) and corticotrophin releasing hormone (crh), do not change during sole metamorphosis, challenging existing assumptions about their role in thyroid hormone production.
Article Abstract
Anuran and flatfish metamorphosis are tightly regulated by thyroid hormones that are the necessary and sufficient factors that drive this developmental event. In the present study whole mount in situ hybridization (WISH) and quantitative PCR in sole are used to explore the central regulation of flatfish metamorphosis. Central regulation of the thyroid in vertebrates is mediated by the hypothalamus-pituitary-thyroid (HPT) axis. Teleosts diverge from other vertebrates as hypothalamic regulation in the HPT axis is proposed to be through hypothalamic inhibition although the regulatory factor remains enigmatic. The dynamics of the HPT axis during sole metamorphosis revealed integration between the activity of the thyrotrophes in the pituitary and the thyroid follicles. No evidence was found supporting a role for thyroid releasing hormone (trh) or corticotrophin releasing hormone (crh) in hypothalamic control of TH production during sole metamorphosis. Intriguingly the results of the present study suggest that neither hypothalamic trh nor crh expression changes during sole metamorphosis and raises questions about the role of these factors and the hypothalamus in regulation of thyrotrophs.
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| http://dx.doi.org/10.1016/j.mce.2014.12.025 | DOI Listing |
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