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Mechanisms in thyroid eye disease - the TSH receptor interacts directly with the IGF-1 receptor.
Endocrinology
January 2025
Thyroid Research Unit, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.
The pathogenesis of Thyroid Eye Disease (TED) has been suggested as due to signal enhancement in orbital fibroblasts as a result of autoantibody-induced, synergistic, interaction between the TSH receptor (TSHR) and the IGF-1 receptor (IGF-1R). This interaction has been explained by a "receptor cross talk", mediated via β-arrestin binding. Here, we have examined if this interaction can be mediated via direct receptor contact using modeling and experimental approaches.
View Article and Find Full Text PDFEctopic Thyrotropin-Secreting Tumor in the Nasopharynx Causing Central Hyperthyroidism.
JCEM Case Rep
January 2025
Section of Endocrinology and Investigative Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College, London W12 ONN, UK.
We report a 31-year-old man with diarrhea and tachycardia. Diagnostic workup confirmed raised free thyroid hormones with unsuppressed thyroid stimulating hormone (TSH). Laboratory assay and medication interference were excluded.
View Article and Find Full Text PDFTranscriptomic landscape of hyperthyroidism in mice overexpressing thyroid-Stimulating hormone.
iScience
January 2025
Medical Research Institute KITANO HOSPITAL, PIIF Tazuke-kofukai, Kita-ku, Osaka 530-8480, Japan.
Activation of thyroid-stimulating hormone receptor (TSHR) fundamentally leads to hyperthyroidism. To elucidate TSHR signaling, we conducted transcriptome analyses for hyperthyroid mice that we generated by overexpressing TSH. TSH overexpression drastically changed their thyroid transcriptome.
View Article and Find Full Text PDFThe glycoprotein hormones of humans, produced in the pituitary and acting through receptors in the gonads to support reproduction and in the thyroid gland for metabolism, have co-evolved from invertebrate counterparts . These hormones are heterodimeric cystine-knot proteins; and their receptors bind the cognate hormone at an extracellular domain and transmit the signal of this binding through a transmembrane domain that interacts with a heterotrimeric G protein. Structures determined for the human receptors as isolated for cryogenic electron microscopy (cryo-EM) are all monomeric despite compelling evidence for their functioning as dimers .
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