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Mol Med Rep. 2018 Feb;17(2):2952-2956. doi: 10.3892/mmr.2017.8272. Epub 2017 Dec 12.

Insulin-like growth factor 1 inhibits autophagy of human colorectal carcinoma drug-resistant cells via the protein kinase B/mammalian target of rapamycin signaling pathway.

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Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China.


Insulin-like growth factor 1 (IGF-1) is reported to inhibit autophagy of human colorectal carcinoma cells (HCT); however, little is known regarding the mechanisms underlying the inhibitory effect of IGF-1 on autophagy in HCT resistant strains. The present study aimed to analyze the inhibitory effect of IGF-1 on the autophagy of HCT resistant strains and its potential underlying mechanisms. The viability and apoptosis of HCT-8 colon cancer cells were analyzed, and expression levels of relevant genes and proteins were investigated using reverse transcription-quantitative polymerase chain reaction and western blot analysis, respectively. Treatment of cells with IGF-1 induced apoptosis. IGF-1 treatment activated protein kinase B (AKT), which may inhibit autophagy via the AKT/mammalian target of rapamycin signaling pathway. Following inhibition of autophagy, drug resistant cells became sensitive to apoptosis induced by 5-fluorouracil.

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