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Lipid droplet accumulation and adipophilin expression in follicular thyroid carcinoma

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Title: Lipid droplet accumulation and adipophilin expression in follicular thyroid carcinoma
Authors: Hayakawa, Michiyo Browse this author
Taylor, J. Nicholas Browse this author
Nakao, Ryuta Browse this author
Mochizuki, Kentaro Browse this author
Sawai, Yuki Browse this author
Hashimoto, Kosuke Browse this author
Tabata, Koji Browse this author
Kumamoto, Yasuaki Browse this author
Fujita, Katsumasa Browse this author
Konishi, Eiichi Browse this author
Hirano, Shigeru Browse this author
Tanaka, Hideo Browse this author
Komatsuzaki, Tamiki Browse this author →KAKEN DB
Harada, Yoshinori Browse this author
Keywords: Follicular neoplasm
Follicular thyroid carcinoma
Follicular thyroid adenoma
Lipid droplet
Issue Date: 15-Jan-2023
Publisher: Elsevier
Journal Title: Biochemical and biophysical research communications
Volume: 640
Start Page: 192
End Page: 201
Publisher DOI: 10.1016/j.bbrc.2022.12.007
Abstract: Follicular neoplasms of the thyroid include follicular thyroid carcinoma (FTC) and follicular thyroid adenoma (FTA). However, the differences in cytological findings between FTC and FTA remain undetermined. Here, we aimed to evaluate the accumulation of lipid droplets (LDs) and the expression of adipophilin (perilipin 2/ADRP/ADFP), a known LD marker, in cultured FTC cells. We also immunohistochemically compared adipophilin expression in the FTC and FTA of resected human thyroid tissues. Cultured FTC (FTC-133 and RO82W-1) possessed increased populations of LDs compared to thyroid follicular epithelial (Nthy-ori 3-1) cells. In vitro treatment with phosphatidylinositol-3-kinase (PI3K)/Akt/ mammalian target of rapamycin (mTOR) signaling inhibitors (LY294002, MK2206, and rapamycin) in FTC-133 cells downregulated the PI3K/Akt/mTOR/sterol regulatory element-binding protein 1 (SREBP1) signaling pathway, resulting in a significant reduction in LD accumulation. SREBP1 is a master transcription factor that controls lipid metabolism. Fluorescence immunocytochemistry revealed adipophilin expression in the LDs of FTC-133 cells. Immunohistochemical analysis of surgically resected human thyroid tissues revealed significantly increased expression of adipophilin in FTC compared with FTA and adjacent non-tumorous thyroid epithelia. Taken together, LDs and adipophilin were abundant in cultured FTC; the evaluation of adipophilin expression can help distinguish FTC from FTA in surgical specimens. (c) 2022 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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