Purpose mTORC1 and mTORC2 inhibition by Ku-0063794 could confer profound anticancer effects against cancer cells because it eliminates feedback activation of Akt. Herein, we aimed to determine anticancer effects of docetaxel and Ku-0063794, individually or in combination, against breast cancer cells, especially triple-negative breast cancer (TNBC) cells.
Materials and Methods MCF-7 breast cancer and MDA-MB-231 TNBC cell lines for in vitro studies and mouse xenograft model for in vivo studies were used to investigate the effect of docetaxel, Ku-0063794, or their combination.
Results In the in vitro experiments, combination therapy synergistically reduced cell viability and induced higher apoptotic cell death in breast cancer cells than the individual monotherapies (p < 0.05). Western blot analysis and flow cytometric analysis showed that the combination therapy induced higher apoptotic cell death than the individual monotherapies (p < 0.05). In the in vivo experiment, docetaxel and Ku-0063794 combination therapy reduced the growth of MDA-MB-231 cells xenografted in the nude mice better than in the individual monotherapies (p < 0.05). Immunohistochemistry showed that the combination therapy induced the highest expression of cleaved caspase-3 and the lowest expression of Bcl-xL in the MDA-MB-231 cells xenografted in the nude mice (p < 0.05). Western blot analysis and immunofluorescence, incorporating both in vitro and in vivo experiments, consistently validated that unlike individual monotherapies, docetaxel and Ku-0063794 combination therapy significantly inhibited epithelial-mesenchymal transition (EMT) and autophagy (p < 0.05).
Conclusion These data suggest that docetaxel and Ku-0063794 combination therapy has higher anticancer activities over individual monotherapies against MDA-MB-231 TNBC cells through a greater inhibition of autophagy and EMT.
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Purpose
Radiation-induced oral mucositis limits delivery of high-dose radiation to targeted cancers. Therefore, it is necessary to develop a treatment strategy to alleviate radiation-induced oral mucositis during radiation therapy. We previously reported that inhibiting reactive oxygen species (ROS) generation suppresses autophagy. Irradiation induces autophagy, suggesting that antioxidant treatment may be used to inhibit radiation-induced oral mucositis.
Materials and Methods
We determined whether treatment with N-acetyl cysteine (NAC) could attenuate radiation-induced buccal mucosa damage in vitro and in vivo. The protective effects of NAC against oral mucositis were confirmed by transmission electron microscopy and immunocytochemistry. mRNA and protein levels of DNA damage and autophagy-related genes were measured by quantitative real-time polymerase chain reaction and western blot analysis, respectively.
Results
Rats manifesting radiation-induced oral mucositis showed decreased oral intake, loss of body weight, and low survival rate. NAC intake slightly increased oral intake, body weight, and the survival rate without statistical significance. However, histopathologic characteristics were markedly restored in NAC-treated irradiated rats. LC3B staining of rat buccal mucosa revealed that NAC treatment significantly decreased the number of radiation-induced autophagic cells. Further, NAC inhibited radiation-induced ROS generation and autophagy signaling. In vitro, NAC treatment significantly reduced the expression of NRF2, LC3B, p62, and Beclin-1 in keratinocytes compared with that after radiation treatment.
Conclusion
NAC treatment significantly inhibited radiation-induced autophagy in keratinocytes and rat buccal mucosa and may be a potentially safe and effective option for the prevention of radiation-induced buccal mucosa damage.
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Purpose
Microtubule-associated protein 1 light chain 3B (LC3B) serves as a key component of autophagy, which is associated with the progression of carcinoma. Yet, it is still unclear whether LC3B is also an independent risk factor for intrahepatic cholangiocarcinoma (ICC). We aim to explore the predictive value of LC3B on prognosis of ICC, and to establish a novel and available nomogram to predict relapse-free survival (RFS) and overall survival (OS) for these patients after curative-intent hepatectomy.
Materials and Methods
From August 2004 to March 2017, 105 ICC patients were eligibly enrolled in the Third Affiliated Hospital of Sun Yat-sen University. Preoperative clinical information of enrolled patients was collected. Expression LC3B in the ICC specimen was detected by immunohistochemistry.
Results
The 5-year RFS and OS in this cohort were 15.7% and 29.6%, respectively. On multivariate Cox regression analysis, independent risk factors for 5-year OS were cancer antigen 125, microvascular invasion, LC3B expression and lymph node metastasis. Except for the above 4 factors, neutrophil/lymphocyte ratio and tumor differentiation were independent factors for 5-year RFS. The area under the curve of nomograms for OS and RFS were 0.820 and 0.747, respectively.
Conclusion
The nomograms based on LC3B can be considered as effective models to predict postoperative survival for ICC patients.
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Cancer Res Treat. 2019;51(2):451-463. Published online June 6, 2018
Purpose
Pim kinases are highly conserved serine/threonine kinases, and different expression patterns of each isoform (Pim-1, Pim-2, and Pim-3) have been observed in various types of human cancers, including gastric cancer. AZD1208 is a potent and selective inhibitor that affects all three isoforms of Pim. We investigated the effects of AZD1208 as a single agent and in combination with an Akt inhibitor in gastric cancer cells.
Materials and Methods
The antitumor activity of AZD1208 with/without an Akt inhibitor was evaluated in a large panel of gastric cancer cell lines through growth inhibition assays. The underlying mechanism was also examined by western blotting, immunofluorescence assay, and cell cycle analysis.
Results
AZD1208 treatment decreased gastric cancer cell proliferation rates and induced autophagy only in long-term culture systems. Light chain 3B (LC3B), a marker of autophagy, was increased in sensitive cells in a dose-dependent manner with AZD1208 treatment, which suggested that the growth inhibition effect of AZD1208 was achieved through autophagy, not apoptosis. Moreover, we found that cells damaged by Pim inhibition were repaired by activation of the DNA damage repair pathway, which promoted cell survival and led the cells to become resistant to AZD1208. We also confirmed that the combination of an Akt inhibitor with AZD1208 produced a highly synergistic effect in gastric cancer cell lines.
Conclusion
Treatment with AZD1208 alone induced considerable cell death through autophagy in gastric cancer cells. Moreover, the combination of AZD1208 with an Akt inhibitor showed synergistic antitumor effects through regulation of the DNA damage repair pathway.
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Purpose
Everolimus only inhibits mammalian target of rapamycin complex 1 (mTORC1), whereas Ku0063794 inhibits both mTORC1 and mTORC2. Although they have similar anticancer effects, their combination has a synergistic effect against hepatocellular carcinoma (HCC) cells. We aimed to determine the mechanism underlying the synergistic effects of everolimus and Ku0063794 associated with autophagy in HCC cells.
Materials and Methods
We compared the effects of everolimus and Ku0063794, individually or in combination, on both the in vitro and in vivo models of HCCs.
Results
HepG2 cells treated with both agents had significantly lower rates of cell proliferation and higher apoptosis than the individual monotherapies (p < 0.05). Autophagic studies consistently indicated that, unlike the monotherapies, the combination therapy significantly reduced autophagy (p < 0.05). Autophagic blockage directly promoted the pro-apoptotic effects of combination therapy, suggesting autophagy as the survival mechanism of HCC cells. Unlike the monotherapies, combination therapy showed the potential to inhibit sirtuin 1 (SIRT1), the positive regulator of autophagy. SIRT1 overexpression abrogated the autophagy-inhibiting and pro-apoptotic effects of combination therapy. In a nude mouse xenograft model, the shrinkage of tumors was more prominent in mice treated with combination therapy than in mice treated with the respective monotherapies (p < 0.05). The immunohistochemical and immunofluorescence stains of the tumor obtained from the xenograft model showed that combination therapy had the potential of reducing autophagy and promoting apoptosis.
Conclusion
The combination of everolimus and Ku0063794 potentiates anticancer effects on HCCs through a decrease in autophagy, which is prompted by SIRT1 downregulation.
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Na Kong, Wei Tao, Xiang Ling, Junqing Wang, Yuling Xiao, Sanjun Shi, Xiaoyuan Ji, Aram Shajii, Silvia Tian Gan, Na Yoon Kim, Dan G. Duda, Tian Xie, Omid C. Farokhzad, Jinjun Shi Science Translational Medicine.2019;[Epub] CrossRef
Purpose
The purpose of this study is to examine the role of the double-stranded RNA (dsRNA) activated Toll–interleukin-1 receptor domain-containing adaptor inducing interferon β (TRIF) signal pathway in triggering apoptosis in hepatocellular carcinoma (HCC) cells.
Materials and Methods
First, siRNA targeted autophagy–related gene LC3 (pU6H1-LC3 siRNA and siLC3) and a dsRNA used as a Toll-like receptor 3 (TLR3) ligand was constructed and synthesized, respectively. Then, a human HCC cell line was transfected with dsRNA, siLC3, and cotransfected with siLC3 and dsRNA (siLC3+dsRNA), respectively. Finally, quantification real-time polymerase chain reaction, western blotting, and immunofluorescence staining were used in the HCC line (SMMC7721), and MTT assay, flow cytometry, terminal deoxynucleotidyl transferase-mediated dUTP nick-end-labeling, and transmission electron microscopy were used in an HCC xenograft model of nude mice. Human umbilical vein endothelial cell tube forming assay, color Doppler ultrasonographic flow image examination, and CD34-positive microvessel density were used in vitro and in vivo.
Results
Compared with untreated cells, the protein and mRNA expression of TLR3 and TRIF was up-regulated, in order, siLC3+dsRNA, dsRNA, and siLC3. Expression of LC3 was obviously down-regulated and the autophagosomes were significantly decreased in siLC3+dsRNA and siLC3, whereas in dsRNA (p < 0.05). LC3 and TRIF colocation was observed in HepG2 cells. Decreased cell viability, increased apoptosis, decrease in xenograft tumor volume, and angiogenesis potential were also observed in order (p < 0.05).
Conclusion
Suppression of intracellular autophagy resulted in decreased degradation of TRIF protein, which can promote triggering of apoptosis by the TLR3-TRIF pathway. dsRNA and siLC3 could play anticancer roles in coordination.
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Purpose
Autophagy is one of the ways to degrade unfolded proteins after endoplasmic reticulum (ER) stress. The purpose of this study is to determine whether a blockade of autophagy leads to aggravated endoplasmic reticulum stress, which then induces cells apoptosis in HeLa cells treated with paclitaxel.
Materials and Methods
Autophagy activation and the proapoptotic effects were characterized using monodansylcadaverine labeling and Hoechest staining, respectively. A Western blot analysis was used to detect the expression of apoptotic and autophagy-related genes. A flow cytometry was used to assess the cell apoptosis ratio.
Results
Paclitaxel exposure induced the aggregation of autophagosomes in the cytoplasms of cervical cancer HeLa cells. The expression of Beclin 1 and LC3 II were upregulated, but p62 was downregulated, which suggests that autophagy was promoted by paclitaxel. On the other hand, the expression of GRP78 obviously increased, suggesting that ER stress was induced after paclitaxel treatment. The cell proliferation assay indicated that a knockdown of Beclin 1 sensitized HeLa cells to paclitaxel. Furthermore, paclitaxel-mediated apoptotic cell death was further potentiated by the pretreatment with autophagy inhibitor chloroquine or small interfering RNA against Beclin 1. These results suggest that an induction of autophagy by paclitaxel may induce cell survival rather than cell death in HeLa cells; moreover, inhibition of autophagy led to an aggravated ER stress and an induction of downstream apoptosis.
Conclusion
Our results reveal autophagy induced by paclitaxel conferred protection of tumor cells against apoptosis, and blockade of autophagy subsequently aggravated ER stress, enhancing the apoptosis associated with paclitaxel treatment in HeLa cells.
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Purpose Radiation-induced autophagy has been shown to play two different roles, in malignant glioma (MG) cells, cytocidal or cytoprotective. However, neither the role of radiation-induced autophagy for cell death nor the existence of autophagy-induced apoptosis, a well-known cell-death pathway after irradiation, has been verified yet. Materials and Methods We observed both temporal and dose-dependent response patterns of autophagy and apoptosis to radiation in MG cell lines. Additionally, we investigated the role of autophagy in apoptosis through knockdown of autophagy-related proteins. Results Autophagic activity measured by staining of acidic vesicle organelles and Western blotting of LC-3 protein increased in proportion to radiation dose from day 1 to 5 after irradiation. Apoptosis measured by annexin-V staining and Western blotting of cleaved poly(ADP-ribose) polymerase demonstrated relatively late appearance 3 days after irradiation that increased for up to 7 days. Blocking of pan-caspase (Z-VAD-FMK) did not affect apoptosis after irradiation, but silencing of Atg5 effectively reduced radiation-induced autophagy, which decreased apoptosis significantly. Inhibition of autophagy in Atg5 knockdown cells was shown to be beneficial for cell survival. Stable transfection of GFP-LC3 cells was observed after irradiation. Annexin-V was localized in cells bearing GFP-LC3 punctuated spots, indicating autophagy in immunofluorescence. Some of these punctuated GFP-LC3 bearing cells formed conglomerated spots and died in final phase. Conclusion These findings suggest that autophagy appears earlier than apoptosis after irradiation and that a portion of the apoptotic population that appears later is autophagy-dependent. Thus, autophagy is a pathway to cell death after irradiation of MG cells.
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