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di Maro, G.* ; Salerno, P.* ; Unger, K.* ; Orlandella, F.M.* ; Monaco, M.* ; Chiappetta, G.* ; Thomas, G.* ; Oczko-Wojciechowska, M.* ; Masullo, M.* ; Jarzab, B.* ; Santoro, M.* ; Salvatore, G.*

Anterior gradient protein 2 promotes survival, migration and invasion of papillary thyroid carcinoma cells.

Mol. Cancer 13:160 (2014)

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Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.

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BACKGROUND: Through a transcriptome microarray analysis, we have isolated Anterior gradient protein 2 (AGR2) as a gene up-regulated in papillary thyroid carcinoma (PTC). AGR2 is a disulfide isomerase over-expressed in several human carcinomas and recently linked to endoplasmic reticulum (ER) stress. Here, we analyzed the expression of AGR2 in PTC and its functional role. METHODS: Expression of AGR2 was studied by immunohistochemistry and real time PCR in normal thyroids and in PTC samples. The function of AGR2 was studied by knockdown in PTC cells and by ectopic expression in non-transformed thyroid cells. The role of AGR2 in the ER stress was analyzed upon treatment of cells, expressing or not AGR2, with Bortezomib and analyzing by Western blot the expression levels of GADD153. RESULTS: PTC over-expressed AGR2 at mRNA and protein levels. Knockdown of AGR2 in PTC cells induced apoptosis and decreased migration and invasion. Ectopic expression of AGR2 in non-transformed human thyroid cells increased migration and invasion and protected cells from ER stress induced by Bortezomib. CONCLUSIONS: AGR2 is a novel marker of PTC and plays a role in thyroid cancer cell survival, migration, invasion and protection from ER stress.

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