Abstract
The subcellular localization of parathyroid hormone (PTH) in the normal human parathyroid glands with particular reference to microwave antigen retrieval was investigated using peroxidase-labeled PTH antibody, immunohistochemical, and immunoelectron microscopic methods. The results revealed that PTH granules existed mainly as pro-PTH on the trans side of Golgi and in the regions adjacent to Golgi apparatus. Only a small proportion of secretory granules were stored near the plasma membrane. Microwave irradiation was essential for the immunodetection of PTH. As the irradiative time extended from 1 to 30 min, the staining intensity increased, and the subcellular preservation decreased. Microwave irradiation for 15 mm (with the sections in citrate buffer) with a power output of 500 W is the most ideal for PTH antigen retrieval, as well as for subcellular preservation.
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