4.6 Article

Aerobic exercise suppresses hepatocellular carcinoma by downregulating dynamin-related protein 1 through PI3K/AKT pathway

Journal

JOURNAL OF INTEGRATIVE MEDICINE-JIM
Volume 19, Issue 5, Pages 418-427

Publisher

ELSEVIER
DOI: 10.1016/j.joim.2021.08.003

Keywords

Aerobic exercise; Hepatocellular carcinoma; Dynamin-related protein; PI3K; AKT pathway

Funding

  1. National Natural Science Foundation of China [81503632]
  2. Youth Startup Fund of the First Affiliated Hospital of Naval Medical University [2019QNB05]

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Exercise can partially suppress the development of liver cancer by regulating the key protein of mitochondrial division, DRP1, through the PI3K/AKT pathway.
Objective: Exercise, as a common non-drug intervention, is one of several lifestyle choices known to reduce the risk of cancer. Mitochondrial division has been reported to play a key role in the occurrence and transformation of hepatocellular carcinoma (HCC). This study investigated whether exercise could regulate the occurrence and development of HCC through mitosis. Methods: Bioinformatics technology was used to analyze the expression level of dynamin-related protein 1 (DRP1), a key protein of mitochondrial division. The effects of DRP1 and DRP1 inhibitor (mdivi-1) on the proliferation and migration of liver cancer cells BEL-7402 were observed using cell counting kit-8, plate colony formation, transwell cell migration, and scratch experiments. Enzyme-linked immunosorbent assay, Western blot and real-time polymerase chain reaction were used to detect the expression of DRP1 and its downstream phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT) pathway. A treadmill exercise intervention was tested in a nude mouse human liver cancer subcutaneous tumor model expressing different levels of DRP1. The size and weight of subcutaneous tumors in mice were detected before and after exercise. Results: The expression of DRP1 in liver cancer tissues was significantly upregulated compared with nor-mal liver tissues (P < 0.001). The proliferation rate and the migration of BEL-7402 cells in the DRP1 over-expression group were higher than that in the control group. The mdivi-1 group showed an inhibitory effect on the proliferation and migration of BEL-7402 cells at 50 lmol/L. Aerobic exercise was able to inhibit the expression of DRP1 and decrease the size and weight of subcutaneous tumors. Moreover, the expression of phosphorylated PI3K (p-PI3K) and phosphorylated AKT (p-AKT) decreased in the exer-cise group. However, exercise could not change p-PI3K and p-AKT levels after knocking down DRP1 or using mdivi-1 on subcutaneous tumor. Conclusion: Aerobic exercise can suppress the development of tumors partially by regulating DRP1 through PI3K/AKT pathway. (C) 2021 Shanghai Yueyang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine. Published by ELSEVIER B.V. All rights reserved.

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