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The existence of an interaction between the adrenal/interrenal axis and the thyroidal axis has since long been established in vertebrates, including fish. However, in contrast to mammals, birds and amphibians, no effort was made in fish to expand these studies beyond the level of measuring plasma thyroid hormones. We therefore set out to examine the acute(More)
In this study, we tried to elucidate the changes in thyroid hormone (TH) receptor beta2 (TRbeta2) expression at the different levels of the hypothalamo-pituitary-thyroidal (HPT) axis during the last week of chicken embryonic development and hatching, a period characterized by an augmented activity of the HPT axis. We quantified TRbeta2 mRNA in retina,(More)
The hatching process in the chicken is accompanied by dramatic changes in plasma thyroid hormones. The cause of these changes, though crucial for hatching and the onset of endothermy, is not known. One hypothesis is that the pituitary gland becomes more sensitive to hypothalamic stimulation during this period. We have tested whether the responsiveness of(More)
The ease of in vivo experimental manipulation is one of the main factors that have made the chicken embryo an important animal model in developmental research, including developmental endocrinology. This review focuses on the development of the thyrotropic, corticotropic and somatotropic axes in the chicken, emphasizing the central role of the pituitary(More)
The last trimester of the embryonic life of chickens is marked by a steady increase in circulating thyroxine (T(4)) levels, reaching a maximum around hatching. We have measured thyroidal mRNA expression levels of several genes involved in the biosynthesis of T(4), namely sodium/iodine symporter (NIS), thyroglobulin (Tg), thyroid peroxidase (TPO),(More)
We report the cloning of the complete coding sequence of the putative chicken type 2 corticotropin-releasing hormone receptor (CRH-R2) by rapid amplification of cDNA ends (RACE). The chicken CRH-R2 is a 412-amino acid 7-transmembrane G protein-coupled receptor, showing 87% identity to the Xenopus laevis and Oncorhynchus keta CRH-R2s, and 78-80% to mammalian(More)
Entanglement of functions between the adrenal (or interrenal) and thyroid axis has been well described for all vertebrates and can be tracked down up to the level of gene expression. Both thyroid hormones and corticosteroids may induce morphological changes leading to metamorphosis climax in the neotenic Mexican axolotl (Ambystoma mexicanum). In a first(More)
TSH and the interaction with its receptor (TSHR) in the thyroid gland play a crucial role in the pituitary-thyroid axis of all vertebrates. Released upon stimulation by TSH, thyroid hormones influence numerous processes in the body and are extremely important during the last week of chicken embryonic development. In this study, we have cloned and(More)
A major life stage transition in birds and other oviparous sauropsids is the hatching of the cleidoic egg. Not unlike amphibian metamorphosis, hatching in these species can be regarded as a transition from a relatively well-protected "aqueous" environment to a more hazardous and terrestrial life outside the egg, a transition in which thyroid hormones (THs)(More)
Pleomorphic adenoma gene 1 (PLAG1) belongs to the PLAG family of zinc finger transcription factors along with PLAG-like 1 and PLAG-like 2. The PLAG1 gene is best known as an oncogene associated with certain types of cancer, most notably pleomorphic adenomas of the salivary gland. While the mechanisms of PLAG1-induced tumorigenesis are reasonably well(More)