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A hormone receptor is a receptor molecule that binds to a specific hormone. Hormone receptors are a wide family of proteins made up of receptors for thyroid and steroid hormones, retinoids and Vitamin D, and a variety of other receptors for various ligands, such as fatty acids and prostaglandins. [1] Hormone receptors are of mainly two classes.
A steroid hormone receptor is a protein molecule located either within the cell cytoplasm or nucleus that specifically binds to steroid hormones, such as estrogen, progesterone, and testosterone, leading to the activation or suppression of gene expression and subsequent cellular responses. This interaction is crucial for mediating the ...
The thyroid hormone receptor (TR) [1] is a type of nuclear receptor that is activated by binding thyroid hormone. [2] ... The THRA gene is located on chromosome 17. [4]
Examples are the class of nuclear receptors located in the cell nucleus and cytoplasm and the IP 3 receptor located on the endoplasmic reticulum.The ligands that bind to them are usually intracellular second messengers like inositol trisphosphate (IP 3) and extracellular lipophilic hormones like steroid hormones.
For steroid or thyroid hormones, their receptors are located inside the cell within the cytoplasm of the target cell. These receptors belong to the nuclear receptor family of ligand-activated transcription factors. To bind their receptors, these hormones must first cross the cell membrane. They can do so because they are lipid-soluble.
In the absence of hormone, estrogen receptors are predominantly located in the cytoplasm. [15] Hormone binding triggers a series of events, beginning with the migration of the receptor from the cytoplasm to the nucleus. This is followed by the dimerization of the receptor, where two receptor molecules join together.
The thyrotropin receptor (or TSH receptor) is a receptor (and associated protein) that responds to thyroid-stimulating hormone (also known as "thyrotropin") and stimulates the production of thyroxine (T4) and triiodothyronine (T3).
The androgen receptor (AR), also known as NR3C4 (nuclear receptor subfamily 3, group C, member 4), is a type of nuclear receptor [9] that is activated by binding any of the androgenic hormones, including testosterone and dihydrotestosterone, [10] in the cytoplasm and then translocating into the nucleus.