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Shchegolev YY, Sorokin DV, Scherbakov AM, Andreeva OE, Salnikova DI, Mikhaevich EI, Gudkova MV, Krasil’nikov MA. Exosomes are involved in the intercellular transfer of rapamycin resistance in the breast cancer cells. Bioimpacts 2023; 13:313-321. [PMID: 37645026 PMCID: PMC10460766 DOI: 10.34172/bi.2023.27490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 05/17/2023] [Accepted: 05/20/2023] [Indexed: 08/31/2023]
Abstract
Introduction Resistance to chemotherapy and/or irradiation remains one of the key features of malignant tumors, which largely limits the efficiency of antitumor therapy. In this work, we studied the progression mechanism of breast cancer cell resistance to target drugs, including mTOR blockers, and in particular, we studied the exosome function in intercellular resistance transfer. Methods The cell viability was assessed by the MTT assay, exosomes were purified by successive centrifugations, immunoblotting was used to evaluate protein expression, AP-1 activity was analyzed using reporter assay. Results In experiments on the MCF-7 cell line (breast cancer) and the MCF-7/Rap subline that is resistant to rapamycin, the capability of resistant cell exosomes to trigger a similar rapamycin resistance in the parent MCF-7 cells was demonstrated. Exosome-induced resistance reproduces the changes revealed in MCF-7/Rap resistant cells, including the activation of ERK/AP-1 signaling, and it remains for a long time, for at least several months, after exosome withdrawal. We have shown that both the MCF-7 subline resistant to rapamycin and cells having exosome-triggered resistance demonstrate a stable decrease in the expression of DNMT3A, the key enzyme responsible for DNA methylation. Knockdown of DNMT3A in MCF-7 cells by siRNA leads to partial cell resistance to rapamycin; thus, the DNMT3A suppression is regarded as one of the necessary elements for the development of acquired rapamycin resistance. Conclusion We propose that DNA demethylation followed by increased expression of key genes may be one of the factors responsible for the progression and maintenance of the resistant cell phenotype that includes exosome-induced resistance.
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Affiliation(s)
- Yuri Yu. Shchegolev
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Danila V. Sorokin
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Alexander M. Scherbakov
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Olga E. Andreeva
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Diana I. Salnikova
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Ekaterina I. Mikhaevich
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Margarita V. Gudkova
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
| | - Mikhail A. Krasil’nikov
- Department of Experimental Tumor Biology, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Kashirskoye Shosse 24, Moscow 115522, Russia
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Chakraborty S, Utter MB, Frias MA, Foster DA. Cancer cells with defective RB and CDKN2A are resistant to the apoptotic effects of rapamycin. Cancer Lett 2021; 522:164-170. [PMID: 34563639 DOI: 10.1016/j.canlet.2021.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/28/2021] [Accepted: 09/13/2021] [Indexed: 10/20/2022]
Abstract
Inhibition of mammalian target of rapamycin complex 1 (mTORC1) with rapamycin in the absence of transforming growth factor-β (TGFβ) signaling induces apoptosis in many cancer cell lines. In the presence of TGFβ, rapamycin induces G1 cell cycle arrest; however, in the absence of TGFβ, cells do not arrest in G1 and progress into S-phase where rapamycin is cytotoxic rather than cytostatic. However, we observed that DU145 prostate and NCI-H2228 lung cancer cells were resistant to the cytotoxic effect of rapamycin. Of interest, the rapamycin-resistant DU145 and NCI-H2228 cells have mutations in the RB and CDKN2A tumor suppressor genes. The gene products of RB and CDKN2A (pRb and p14ARF) suppress E2F family transcription factors that promote cell cycle progression from G1 into S. Restoration of wild type RB or inhibition of E2F activity in DU145 and NCI-H2228 cells led to rapamycin sensitivity. These data provide evidence that the combination of mutant RB and mutant CDKN2A in cancer cells leads to rapamycin resistance, which has implications for precision medicine approaches to anti-cancer therapies.
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Affiliation(s)
- Sohag Chakraborty
- Department of Biological Sciences, Hunter College of the City University of New York, New York, NY, USA; Biochemistry Program, Graduate Center of the City University of New York, NY, New York, USA
| | - Matthew B Utter
- Department of Biological Sciences, Hunter College of the City University of New York, New York, NY, USA; Biochemistry Program, Graduate Center of the City University of New York, NY, New York, USA
| | - Maria A Frias
- Department of Biological Sciences, Hunter College of the City University of New York, New York, NY, USA
| | - David A Foster
- Department of Biological Sciences, Hunter College of the City University of New York, New York, NY, USA; Biochemistry Program, Graduate Center of the City University of New York, NY, New York, USA; Department of Pharmacology, Weill Cornell Medicine, New York, NY, USA.
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Zhang ZW, Guo RW, Lv JL, Wang XM, Ye JS, Lu NH, Liang X, Yang LX. MicroRNA-99a inhibits insulin-induced proliferation, migration, dedifferentiation, and rapamycin resistance of vascular smooth muscle cells by inhibiting insulin-like growth factor-1 receptor and mammalian target of rapamycin. Biochem Biophys Res Commun 2017; 486:414-422. [PMID: 28315335 DOI: 10.1016/j.bbrc.2017.03.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 03/13/2017] [Indexed: 10/20/2022]
Abstract
Patients with type 2 diabetes mellitus (T2DM) are characterized by insulin resistance and are subsequently at high risk for atherosclerosis. Hyperinsulinemia has been associated with proliferation, migration, and dedifferentiation of vascular smooth muscle cells (VSMCs) during the pathogenesis of atherosclerosis. Moreover, insulin-like growth factor-1 receptor (IGF-1R) and mammalian target of rapamycin (mTOR) have been demonstrated to be the underlying signaling pathways. Recently, microRNA-99a (miR-99a) has been suggested to regulate the phenotypic changes of VSMCs in cancer cells. However, whether it is involved in insulin-induced changes of VSCMs has not been determined. In this study, we found that insulin induced proliferation, migration, and dedifferentiation of mouse VSMCs in a dose-dependent manner. Furthermore, the stimulating effects of high-dose insulin on proliferation, migration, and dedifferentiation of mouse VSMCs were found to be associated with the attenuation of the inhibitory effects of miR-99a on IGF-1R and mTOR signaling activities. Finally, we found that the inducing effect of high-dose insulin on proliferation, migration, and dedifferentiation of VSMCs was partially inhibited by an active mimic of miR-99a. Taken together, these results suggest that miR-99a plays a key regulatory role in the pathogenesis of insulin-induced proliferation, migration, and phenotype conversion of VSMCs at least partly via inhibition of IGF-1R and mTOR signaling. Our results provide evidence that miR-99a may be a novel target for the treatment of hyperinsulinemia-induced atherosclerosis.
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Affiliation(s)
- Zi-Wei Zhang
- Department of Postgraduate, Kunming Medical University, Yunnan, 650500, China; Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Rui-Wei Guo
- Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Jin-Lin Lv
- Department of Postgraduate, Kunming Medical University, Yunnan, 650500, China; Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Xian-Mei Wang
- Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Jin-Shan Ye
- Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Ni-Hong Lu
- Department of Postgraduate, Kunming Medical University, Yunnan, 650500, China; Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Xing Liang
- Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China
| | - Li-Xia Yang
- Department of Cardiology, Kunming General Hospital of Chengdu Military Area, China.
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Ito H, Ichiyanagi O, Naito S, Bilim VN, Tomita Y, Kato T, Nagaoka A, Tsuchiya N. GSK-3 directly regulates phospho-4EBP1 in renal cell carcinoma cell-line: an intrinsic subcellular mechanism for resistance to mTORC1 inhibition. BMC Cancer 2016; 16:393. [PMID: 27387559 PMCID: PMC4936323 DOI: 10.1186/s12885-016-2418-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 06/27/2016] [Indexed: 01/05/2023] Open
Abstract
Background The phosphoinositide 3-kinase (PI3K)/Akt/mammalian target of rapamycin 1 (mTORC1) signaling pathway is aberrantly activated in renal cell carcinoma (RCC). We previously demonstrated glycogen synthase kinase-3β (GSK-3β) positively regulated RCC proliferation. The aim of this study was to evaluate the role of GSK-3 in the PI3K/Akt/mTORC1 pathway and regulation of the downstream substrates, eukaryotic translation initiation factor 4E-binding protein 1 (4EBP1), ribosomal protein S6 kinase (S6K), and ribosomal protein S6 (S6RP). Methods We used human RCC cell lines (ACHN, Caki1, and A498) and, as normal controls, human renal proximal tubular epithelial cell (HRPTEpC) and non-tumorous kidney tissues that were obtained surgically for treatment of RCC patients. Rapamycin-resistant ACHN (ACHN/RR) cells were generated with chronic exposure of ACHN to rapamycin ranging from 1nM finally to 1 μM. Cell viability, cell cycling and direct interaction between GSK-3β and 4EBP1 were evaluated with MTS assay, flowcytometry and in vitro kinase assay with recombinant GSK-3β and 4EBP1products, respectively. Protein expression and phosphorylation of molecules associated with the PI3K/Akt/mTORC1 pathway were examined by immunoblotting. Effects of drug combination were determined as the combination index with CompuSyn software. Results Overexpression and phosphorylation of 4EBP1 and S6RP together with GSK-3 activation were observed in RCC cell lines, but not in human normal kidney cells and tissues. Cell proliferation, p4EBP1 and pS6RP were strongly suppressed by GSK-3 inhibition. Rapamycin and LY294002 sufficiently decreased pS6RP, but only moderately p4EBP1. In vitro kinase assays showed that recombinant GSK-3β phosphorylated recombinant 4EBP1, and the effect was blocked by GSK-3 inhibitors. Different from rapamycin, AR- A014418 remarkably inhibited cell proliferation, and rapidly suppressed p4EBP1 and pS6RP in ACHN and ACHN/RR (in 30 min to 1 h). AR- A014418 and rapamycin combination showed additivity at lower concentrations, but antagonism at higher concentrations. Conclusions GSK-3β could directly phosphorylate 4EBP1 and activate the mTORC1 downstream signaling cascades to enhance protein biosynthesis and cell proliferation in RCC cell lines independent of rapamycin sensitivity. The direct GSK-3β/4EBP1 pathway might be an important subcellular mechanism as an inherent equipment for RCC cells to acquire clinical chemoresistance to mTORC1 inhibitors. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2418-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hiromi Ito
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan.
| | - Osamu Ichiyanagi
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan
| | - Sei Naito
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan
| | - Vladimir N Bilim
- Division of Urology, Department of Regenerative and Transplant Medicine, Niigata Graduate School of Medical and Dental Sciences, 1-757, Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan
| | - Yoshihiko Tomita
- Division of Urology, Department of Regenerative and Transplant Medicine, Niigata Graduate School of Medical and Dental Sciences, 1-757, Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan
| | - Tomoyuki Kato
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan
| | - Akira Nagaoka
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan
| | - Norihiko Tsuchiya
- Department of Urology, Yamagata University Faculty of Medicine, 2-2-2 Iida-Nishi, Yamagata, 990-9585, Japan
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