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Hormone receptor
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Hormone receptor : ウィキペディア英語版
Hormone receptor
A hormone receptor is a molecule that can bind to a specific hormone. Receptors for peptide hormones tend to be found on the plasma membrane of cells, whereas receptors for lipid-soluble hormones are usually found within the cytoplasm. Upon hormone binding, the receptor can initiate multiple signaling pathways which ultimately lead to changes in the behaviour of the target cells.
== Water-soluble hormone receptors ==
Water-soluble hormones include glycoproteins, catecholamines and peptide hormones composed of polypeptides, e.g. thyroid-stimulating hormone, follicle-stimulating hormone, luteinizing hormone and insulin. These molecules are not lipid-soluble and therefore cannot diffuse through cell membranes. Consequently, receptors for peptide hormones are located on the plasma membrane.
The main two types of transmembrane hormone receptor are the G-protein-coupled receptor and the enzyme-coupled receptor. These receptors generally function via intracellular second messengers, including cyclic AMP (cAMP), cyclic GMP (cGMP), inositol 1,4,5-trisphosphate (IP3) and the calcium (Ca2+)-calmodulin system.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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