KMID : 0613820100200081249
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Journal of Life Science 2010 Volume.20 No. 8 p.1249 ~ p.1253
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Sericin Enhances Secretion of Thyroglobulin in the Thyrocytes
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Jin Cho-Yi
Kim Seung-Hwan Yeo Joo-Hong Kwon O-Yu Kwon Ki-Sang Goo Tae-Won Yun Eun-Young Yu Kweon Choi Jong-Soon Song Seong-Hee Go Young-Hwa
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Abstract
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Sericin is a type of high molecular weight water-soluble glycoprotein surrounding fibroin (silk protein) that has been used as a cell culture supplement and accelerates cell proliferation in various serum-free media. The purpose of this study was to investigate the enhancing effect of thyroglobulin (Tg) secretion by sericin in thyrocytes, FRTL-5 cells. While Tg-mRNA expression was not enhanced, a secreted form of Tg was obviously increased by sericin. In this status, expression of both endoplasmic reticulum (ER) molecular chaperones (Bip & calreticulin) and ER membrane proteins (IRE1, PERK & ATF6) was enhanced. The proximal step of IRE1, XBP1 mRNA splicing was slightly detected however, the proximal step of PERK, phosphorylation of eIF2¥á, was changeless. In addition, sericin enhanced cell viability by the MTT assay. The above results showing the ability of sericin to promote protein production demonstrated its potential usefulness as a new biomaterial.
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KEYWORD
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Sericin, thyroglobulin, ER molecular chaperone
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