The TGF-β pathway is activated by 5-fluorouracil treatment in drug resistant colorectal carcinoma cells.
TGF-β pathway is generally associated with the processes of metastasis, angiogenesis and EMT in cancer. Very little is known, however, about the role of TGF-β in cancer drug resistance. In this work, we show a specific activation of the TGF-β pathway in consequence of chemotherapeutic treatment in in vivo and in vitro models of colorectal carcinoma. 5-Fluorouracil (5FU) was able to stimulate the activation of SMAD3 and the transcription of specific genes such as ACVRL1, FN1 and TGFB1. On the other hand, the specific inhibition of TGF-βRI was able to repress the 5FU-induced genes transcription and to restore the sensitivity of chemoresistant cells to the toxic action of the drug, by decreasing the expression of BCL2L1 and ID1 genes. The role of the TGF-β molecule in the chemoresistant colon carcinoma cells' response to 5FU was further demonstrated by conditioned medium (CM) experiments: CM from 5FU-treated chemoresistant cells was able to protect chemosensitive cells against the toxic action of 5FU. In conclusion, these findings showed the pivotal role of TGF-β pathway in colon cancer mechanisms of drug resistance suggesting new possible approaches in diagnosis and treatment of colon cancer patients.
['Romano|Gabriele|G|', 'Santi|Ludovica|L|', 'Bianco|Maria Rosaria|MR|', 'Giuffrè|Maria Rita|MR|', 'Pettinato|Mariateresa|M|', 'Bugarin|Cristina|C|', 'Garanzini|Cristina|C|', 'Savarese|Leonilde|L|', 'Leoni|Silvia|S|', 'Cerrito|Maria Grazia|MG|', 'Leone|Biagio Eugenio|BE|', 'Gaipa|Giuseppe|G|', 'Grassilli|Emanuela|E|', 'Papa|Michele|M|', 'Lavitrano|Marialuisa|M|', 'Giovannoni|Roberto|R|']
D000818:Animals D000970:Antineoplastic Agents D049109:Cell Proliferation D015179:Colorectal Neoplasms D019008:Drug Resistance, Neoplasm D005472:Fluorouracil D045325:HCT116 Cells D006801:Humans D051379:Mice D016212:Transforming Growth Factor beta D023041:Xenograft Model Antitumor Assays
TGF-β 5-fluorouracil SMAD3 chemoresistance colorectal cancer