Purification of Gekko Small Peptide Fraction and Its Effect of Inducing Apoptosis of EC 9706 Esophageal Cancer Cells by Inhibiting PI3K/Akt/GLUT1 Signaling Pathway

Xing-zhi Lv,Rui-fang Li,Zhongjie Li,Jiangang Wang

Published 2021 in Chemistry and Biodiversity

ABSTRACT

This study aimed to isolate and purify a cytotoxic extraction from Gekko japonicus, identify its components and determine its cytotoxic activity in vitro. We isolated and identified the most potent cytotoxic Gekko small peptide LH‐20‐15. The identification and analysis of peptide sequences of LH‐20‐15 were performed by de novo peptide sequencing, and two new peptides were found. LH‐20‐15 significantly inhibited the proliferation of human esophageal squamous carcinoma EC 9706 cells in a dose‐dependent manner. Furthermore, LH‐20‐15 induced apoptosis in esophageal cancer cells by activating the mitochondrial apoptotic pathway. Further research showed that LH‐20‐15 inhibited the PI3 K/Akt/GLUT1 signaling pathway. In conclusion, LH‐20‐15 from Gekko japonicus is a peptide mixture and may inhibit EC 9706 cell proliferation and induce apoptosis by activating the mitochondrial apoptotic pathway. It also regulates glucose metabolism by targeting the PI3 K/Akt/GLUT1 signaling pathway. These small peptides could be new sources of natural cytotoxic ingredients against esophageal cancer with potential drug values.

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