Propofol regulates miR-1-3p/IGF1 axis to inhibit the proliferation and accelerates apoptosis of colorectal cancer cells

Abstract

This study aimed to clarify the mechanism of propofol on proliferation and apoptosis of colorectal cancer (CRC) cell. SW620 and HCT15 cells were exposed to different concentrations of propofol, the proliferation and apoptotic rate, were measured by MTT, colony formation and flow cytometry assays, respectively. The expressions of miR-1-3p and insulin-like growth factors 1 (IGF1) were examined by real-time polymerase chain reaction (RT-qPCR). Western bolt was employed to quantify the protein levels of IGF1 and apoptotic proteins. The molecular interaction between miR-1-3p and IGF1 was validated using dual-luciferase reporter assay. A xenograft tumor model was established to further assess the effects of propofol on CRC in vivo. Propofol dramatically decreased the proliferation and elevated apoptotic rate of CRC cells. RT-qPCR assay demonstrated that miR-1-3p was downregulated in CRC cells, and could be strikingly increased by propofol. Importantly, miR-1-3p inhibited IGF-1 expression through interacting with its 3'-UTR region, thus inactivating AKT/mTOR signals. Gain or loss of functional study revealed that miR-1-3p downregulation remarkedly diminished the anti-tumor roles of propofol by directly inhibiting IGF1. In vivo study showed that propofol inhibited tumor growth by regulating miR-1-3p/IGF1 axis. Our data eventually elucidated that propofol suppressed CRC progression by promoting miR-1-3p which targeted IGF1. These results might provide a scientific basis for the application of propofol on the clinical surgery and the prognosis of patients with CRC.

Keywords: AKT/mTOR signaling; colorectal cancer; insulin-like growth factor 1; miR-1-3p; propofol.