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- W1982247105 abstract "Three different approaches are described which provide independent and new evidence that gonadotropin-releasing hormone (GnRH) internalization and GnRH-stimulated LH release are distinct actions of the releasing hormone. 1) Removal of GnRH from medium bathing the pituitary cell cultures resulted in the prompt return of LH release to basal levels. This finding indicated that a continuous supply of externally applied GnRH is required for the stimulation of LH release. 2) Covalent immobilization of D-Lys6-des-Gly10-Pro9-ethylamide GnRH (a GnRH agonist) on agarose beads resulted in a derivative which stimulated LH release with full efficacy. At concentrations of immobilized releasing hormone analog sufficient to evoke gonadotropin release, the quantity of LH release was restricted by the number of beads added. This finding was interpreted as evidence that the attachment of immobilized agonist was stable during the bioassay and indicated that LH release could be stimulated with full efficacy without the requirement for GnRH internalization. 3) Comparative studies using image-intensified microscopy and the cell culture bioassay showed that 100 microM vinblastin markedly inhibited large scale patching and capping of the GnRH receptor (viewed by image-intensified microscopy), but did not alter the EC50 or efficacy of LH release stimulated by GnRH or the agonist described above. These observations indicated that internalization as well as large scale patching and capping of the GnRH receptor are not required for LH release." @default.
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- W1982247105 date "1981-12-01" @default.
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- W1982247105 title "Luteinizing Hormone Release and Gonadotropin-Releasing Hormone (GnRH) Receptor Internalization: Independent Actions of GnRH*" @default.
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- W1982247105 doi "https://doi.org/10.1210/endo-109-6-2040" @default.
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