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14 August 2019 : Laboratory Research  

Irisin Enhances Doxorubicin-Induced Cell Apoptosis in Pancreatic Cancer by Inhibiting the PI3K/AKT/NF-κB Pathway

Jiayu Liu12ABCDEF, Yibing Huang12ACDF, Yu Liu3ACEG*, Yuxin Chen12ACEG

DOI: 10.12659/MSM.917625

Med Sci Monit 2019; 25:6085-6096

Abstract

BACKGROUND: Irisin, a myokine released from skeletal muscle following exercise, has been shown to affect the proliferation of some cancer cells and chemosensitivity of anticancer drugs like doxorubicin (DOX). However, the effects of irisin on chemosensitivity in pancreatic cancer (PC) cells have not been studied.

MATERIAL AND METHODS: In this study, the effects of irisin co-treatment with DOX or gemcitabine (GEM) on MIA PaCa-2, BxPC-3 PC cells, and H9c2 cardiomyocytes were investigated. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, flow cytometry, and TUNEL (TdT-mediated dUTP nick-end labeling) assays were conducted to evaluate cytotoxicity induced by DOX or GEM. Fluorescence microscopy and flow cytometry experiments were performed to assess the intracellular accumulation of DOX. Cellular levels of apoptosis-related protein expression and protein phosphorylation were determined by Western blot analyses.

RESULTS: The results showed that irisin can increase the chemosensitivity of PC cells to DOX or GEM. The analyses of apoptosis indicated that irisin enhances DOX-induced cellular apoptosis by increasing the expression of cleaved PARP (poly ADP-ribose polymerase) and cleaved caspase-3, and reducing the expression of B cell lymphoma/lewkmia-2 (BCL-2) and B cell lymphoma-extra large (BCL-xL) in PC cells but not in H9c2 cells. Irisin attenuated serine/threonine kinase AKT (protein kinase B/PKB) phosphorylation and inhibited the activation of nuclear factor κB (NF-κB) signaling in PC cells.

CONCLUSIONS: Irisin can potentiate the cytotoxicity of doxorubicin in PC cells without increasing cardiotoxicity, possibly through inactivating the PI3K/AKT/NF-κB signaling pathway.

Keywords: Apoptosis Inducing Factor, Doxorubicin, Pancreatic Neoplasms, Antineoplastic Combined Chemotherapy Protocols, Cell Death, Deoxycytidine, Drug Synergism, Fibronectins, Myocytes, Cardiac, Phosphatidylinositol 3-Kinases, Phosphorylation, Proto-Oncogene Proteins c-akt

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750