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Eberlein C, Williamson SC, Hopcroft L, Ros S, Moss JI, Kerr J, van Weerden WM, de Bruin EC, Dunn S, Willis B, Ross SJ, Rooney C, Barry ST. Capivasertib combines with docetaxel to enhance anti-tumour activity through inhibition of AKT-mediated survival mechanisms in prostate cancer. Br J Cancer 2024; 130:1377-1387. [PMID: 38396173 PMCID: PMC11014923 DOI: 10.1038/s41416-024-02614-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/25/2024] [Accepted: 02/02/2024] [Indexed: 02/25/2024] Open
Abstract
BACKGROUND/OBJECTIVE To explore the anti-tumour activity of combining AKT inhibition and docetaxel in PTEN protein null and WT prostate tumours. METHODS Mechanisms associated with docetaxel capivasertib treatment activity in prostate cancer were examined using a panel of in vivo tumour models and cell lines. RESULTS Combining docetaxel and capivasertib had increased activity in PTEN null and WT prostate tumour models in vivo. In vitro short-term docetaxel treatment caused cell cycle arrest in the majority of cells. However, a sub-population of docetaxel-persister cells did not undergo G2/M arrest but upregulated phosphorylation of PI3K/AKT pathway effectors GSK3β, p70S6K, 4E-BP1, but to a lesser extent AKT. In vivo acute docetaxel treatment induced p70S6K and 4E-BP1 phosphorylation. Treating PTEN null and WT docetaxel-persister cells with capivasertib reduced PI3K/AKT pathway activation and cell cycle progression. In vitro and in vivo it reduced proliferation and increased apoptosis or DNA damage though effects were more marked in PTEN null cells. Docetaxel-persister cells were partly reliant on GSK3β as a GSK3β inhibitor AZD2858 reversed capivasertib-induced apoptosis and DNA damage. CONCLUSION Capivasertib can enhance anti-tumour effects of docetaxel by targeting residual docetaxel-persister cells, independent of PTEN status, to induce apoptosis and DNA damage in part through GSK3β.
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Affiliation(s)
- Cath Eberlein
- Bioscience, Early Oncology, AstraZeneca, Alderley Park, UK
| | | | | | - Susana Ros
- Bioscience, Early Oncology, AstraZeneca, Cambridge, UK
| | | | - James Kerr
- Bioscience, Early Oncology, AstraZeneca, Cambridge, UK
| | - Wytske M van Weerden
- Department of Experimental Urology, Josephine Nefkens Institute, Erasmus University Medical Center, Rotterdam, the Netherlands
| | | | - Shanade Dunn
- Bioscience, Early Oncology, AstraZeneca, Cambridge, UK
| | - Brandon Willis
- Bioscience, Early Oncology, AstraZeneca, Boston, MA, USA
| | - Sarah J Ross
- Bioscience, Early Oncology, AstraZeneca, Cambridge, UK
| | | | - Simon T Barry
- Bioscience, Early Oncology, AstraZeneca, Cambridge, UK.
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Rao S, He Z, Wang Z, Yin H, Hu X, Tan Y, Wan T, Zhu H, Luo Y, Wang X, Li H, Wang Z, Hu X, Hong C, Wang Y, Luo M, Du W, Qian Y, Tang S, Xie H, Chen C. Extracellular vesicles from human urine-derived stem cells delay aging through the transfer of PLAU and TIMP1. Acta Pharm Sin B 2024; 14:1166-1186. [PMID: 38487008 PMCID: PMC10935484 DOI: 10.1016/j.apsb.2023.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 03/17/2024] Open
Abstract
Aging increases the risks of various diseases and the vulnerability to death. Cellular senescence is a hallmark of aging that contributes greatly to aging and aging-related diseases. This study demonstrates that extracellular vesicles from human urine-derived stem cells (USC-EVs) efficiently inhibit cellular senescence in vitro and in vivo. The intravenous injection of USC-EVs improves cognitive function, increases physical fitness and bone quality, and alleviates aging-related structural changes in different organs of senescence-accelerated mice and natural aging mice. The anti-aging effects of USC-EVs are not obviously affected by the USC donors' ages, genders, or health status. Proteomic analysis reveals that USC-EVs are enriched with plasminogen activator urokinase (PLAU) and tissue inhibitor of metalloproteinases 1 (TIMP1). These two proteins contribute importantly to the anti-senescent effects of USC-EVs associated with the inhibition of matrix metalloproteinases, cyclin-dependent kinase inhibitor 2A (P16INK4a), and cyclin-dependent kinase inhibitor 1A (P21cip1). These findings suggest a great potential of autologous USC-EVs as a promising anti-aging agent by transferring PLAU and TIMP1 proteins.
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Affiliation(s)
- Shanshan Rao
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Zehui He
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Zun Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
- Xiangya School of Nursing, Central South University, Changsha 410013, China
| | - Hao Yin
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Xiongke Hu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
- Department of Pediatric Orthopedics, Hunan Children's Hospital, University of South China, Changsha 410007, China
| | - Yijuan Tan
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Tengfei Wan
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Hao Zhu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Yi Luo
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Xin Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Hongming Li
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Zhenxing Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Xinyue Hu
- Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Chungu Hong
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Yiyi Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Mingjie Luo
- Xiangya School of Nursing, Central South University, Changsha 410013, China
- School of Nursing, Xinjiang Medical University, Urumqi, Xinjiang 830000, China
| | - Wei Du
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Department of Rehabilitation, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yuxuan Qian
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
| | - Siyuan Tang
- Xiangya School of Nursing, Central South University, Changsha 410013, China
| | - Hui Xie
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Chunyuan Chen
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha 410008, China
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Zhang Y, Liu L, Qi Y, Lou J, Chen Y, Liu C, Li H, Chang X, Hu Z, Li Y, Zhang Y, Feng C, Zhou Y, Zhai Y, Li C. Lactic acid promotes nucleus pulposus cell senescence and corresponding intervertebral disc degeneration via interacting with Akt. Cell Mol Life Sci 2024; 81:24. [PMID: 38212432 PMCID: PMC11071984 DOI: 10.1007/s00018-023-05094-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 01/13/2024]
Abstract
The accumulation of metabolites in the intervertebral disc is considered an important cause of intervertebral disc degeneration (IVDD). Lactic acid, which is a metabolite that is produced by cellular anaerobic glycolysis, has been proven to be closely associated with IVDD. However, little is known about the role of lactic acid in nucleus pulposus cells (NPCs) senescence and oxidative stress. The aim of this study was to investigate the effect of lactic acid on NPCs senescence and oxidative stress as well as the underlying mechanism. A puncture-induced disc degeneration (PIDD) model was established in rats. Metabolomics analysis revealed that lactic acid levels were significantly increased in degenerated intervertebral discs. Elimination of excessive lactic acid using a lactate oxidase (LOx)-overexpressing lentivirus alleviated the progression of IVDD. In vitro experiments showed that high concentrations of lactic acid could induce senescence and oxidative stress in NPCs. High-throughput RNA sequencing results and bioinformatic analysis demonstrated that the induction of NPCs senescence and oxidative stress by lactic acid may be related to the PI3K/Akt signaling pathway. Further study verified that high concentrations of lactic acid could induce NPCs senescence and oxidative stress by interacting with Akt and regulating its downstream Akt/p21/p27/cyclin D1 and Akt/Nrf2/HO-1 pathways. Utilizing molecular docking, site-directed mutation and microscale thermophoresis assays, we found that lactic acid could regulate Akt kinase activity by binding to the Lys39 and Leu52 residues in the PH domain of Akt. These results highlight the involvement of lactic acid in NPCs senescence and oxidative stress, and lactic acid may become a novel potential therapeutic target for the treatment of IVDD.
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Affiliation(s)
- Yuyao Zhang
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Libangxi Liu
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
- Department of Orthopedics, General Hospital of Central Theater Command of PLA, Wuhan, 430000, China
| | - Yuhan Qi
- Institute of Basic Theory of Traditional Chinese Medicine, China Academy of Chinese Medical Science, Beijing, 100000, China
| | - Jinhui Lou
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Yuxuan Chen
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Chao Liu
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Haiyin Li
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Xian Chang
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Zhilei Hu
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Yueyang Li
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Yang Zhang
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Chencheng Feng
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China
| | - Yu Zhai
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China.
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China.
| | - Changqing Li
- Department of Orthopedics, Xinqiao Hospital, Army Military Medical University, Chongqing, 400037, China.
- State Key Laboratory of Trauma, Burn and Combined Injury, Army Military Medical University, Chongqing, 400038, China.
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Zhang P, Wu S, He Y, Li X, Zhu Y, Lin X, Chen L, Zhao Y, Niu L, Zhang S, Li X, Zhu L, Shen L. LncRNA-Mediated Adipogenesis in Different Adipocytes. Int J Mol Sci 2022; 23:ijms23137488. [PMID: 35806493 PMCID: PMC9267348 DOI: 10.3390/ijms23137488] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 06/29/2022] [Accepted: 07/04/2022] [Indexed: 02/01/2023] Open
Abstract
Long-chain noncoding RNAs (lncRNAs) are RNAs that do not code for proteins, widely present in eukaryotes. They regulate gene expression at multiple levels through different mechanisms at epigenetic, transcription, translation, and the maturation of mRNA transcripts or regulation of the chromatin structure, and compete with microRNAs for binding to endogenous RNA. Adipose tissue is a large and endocrine-rich functional tissue in mammals. Excessive accumulation of white adipose tissue in mammals can cause metabolic diseases. However, unlike white fat, brown and beige fats release energy as heat. In recent years, many lncRNAs associated with adipogenesis have been reported. The molecular mechanisms of how lncRNAs regulate adipogenesis are continually investigated. In this review, we discuss the classification of lncRNAs according to their transcriptional location. lncRNAs that participate in the adipogenesis of white or brown fats are also discussed. The function of lncRNAs as decoy molecules and RNA double-stranded complexes, among other functions, is also discussed.
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Affiliation(s)
- Peiwen Zhang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Shuang Wu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Yuxu He
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Xinrong Li
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Yan Zhu
- College of Life Science, China West Normal University, Nanchong 637009, China;
| | - Xutao Lin
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Lei Chen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Ye Zhao
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Lili Niu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Shunhua Zhang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Xuewei Li
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
| | - Li Zhu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
- Correspondence: (L.Z.); (L.S.); Tel.: +86-28-8629-1133 (L.Z. & L.S.)
| | - Linyuan Shen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China; (P.Z.); (S.W.); (Y.H.); (X.L.); (X.L.); (L.C.); (Y.Z.); (L.N.); (S.Z.); (X.L.)
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China
- Correspondence: (L.Z.); (L.S.); Tel.: +86-28-8629-1133 (L.Z. & L.S.)
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Ion Channel Drugs Suppress Cancer Phenotype in NG108-15 and U87 Cells: Toward Novel Electroceuticals for Glioblastoma. Cancers (Basel) 2022; 14:cancers14061499. [PMID: 35326650 PMCID: PMC8946312 DOI: 10.3390/cancers14061499] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 01/07/2023] Open
Abstract
Glioblastoma is a lethal brain cancer that commonly recurs after tumor resection and chemotherapy treatment. Depolarized resting membrane potentials and an acidic intertumoral extracellular pH have been associated with a proliferative state and drug resistance, suggesting that forced hyperpolarization and disruption of proton pumps in the plasma membrane could be a successful strategy for targeting glioblastoma overgrowth. We screened 47 compounds and compound combinations, most of which were ion-modulating, at different concentrations in the NG108-15 rodent neuroblastoma/glioma cell line. A subset of these were tested in the U87 human glioblastoma cell line. A FUCCI cell cycle reporter was stably integrated into both cell lines to monitor proliferation and cell cycle response. Immunocytochemistry, electrophysiology, and a panel of physiological dyes reporting voltage, calcium, and pH were used to characterize responses. The most effective treatments on proliferation in U87 cells were combinations of NS1643 and pantoprazole; retigabine and pantoprazole; and pantoprazole or NS1643 with temozolomide. Marker analysis and physiological dye signatures suggest that exposure to bioelectric drugs significantly reduces proliferation, makes the cells senescent, and promotes differentiation. These results, along with the observed low toxicity in human neurons, show the high efficacy of electroceuticals utilizing combinations of repurposed FDA approved drugs.
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Halkoum R, Salnot V, Capallere C, Plaza C, L'Honoré A, Pays K, Friguet B, Nizard C, Petropoulos I. Glyoxal induces senescence in human keratinocytes through oxidative stress and activation of the AKT/FOXO3a/p27 KIP1 pathway. J Invest Dermatol 2021; 142:2068-2078.e7. [PMID: 34971698 DOI: 10.1016/j.jid.2021.12.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 11/08/2021] [Accepted: 12/07/2021] [Indexed: 01/10/2023]
Abstract
Senescence is a well-characterized cellular state associated with specific markers such as permanent cell proliferation arrest, and the secretion of messenger molecules by cells expressing the Senescence-Associated Secretory Phenotype (SASP). The SASP composition depends on many factors such as the cell type or the nature of the stress that induces senescence. Since the skin constitutes a barrier with the external environment, it is particularly subjected to different types of stresses, and consequently prone to premature cellular aging. The dicarbonyl compounds glyoxal and methylglyoxal are precursors of Advanced Glycation End-products (AGEs), whose presence marks normal and pathological aging. In this study, we demonstrate that glyoxal treatment provokes oxidative stress by increasing reactive oxygen species and AGEs levels and induces senescence in human keratinocytes. Furthermore, glyoxal-induced senescence bears a unique molecular progression profile: an "early-stage" when AKT-FOXO3a-p27KIP1 pathway mediates cell-cycle arrest, and a "late-stage" senescence maintained by the p16INK4/pRb pathway. Moreover, we characterized the resulting secretory phenotype during early senescence by mass spectrometry. Our study provides evidence that glyoxal can affect keratinocyte functions and act as a driver of human skin aging. Hence, senotherapeutics aimed at modulating glyoxal-associated senescence phenotype hold promising potential.
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Affiliation(s)
- Rym Halkoum
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Ageing, B2A-IBPS, 75005 Paris, France; LVMH Recherche. Life Science Department, 185 Avenue de Verdun, 45800, Saint Jean de Braye, France
| | - Virginie Salnot
- 3P5 proteom'IC facility, Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Christophe Capallere
- Ashland, Global Skin Research Center, Advanced Skin Research & Bioengineering Dept., Sophia Antipolis, France
| | - Christelle Plaza
- Ashland, Global Skin Research Center, Advanced Skin Research & Bioengineering Dept., Sophia Antipolis, France
| | - Aurore L'Honoré
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Ageing, B2A-IBPS, 75005 Paris, France
| | - Karl Pays
- LVMH Recherche. Life Science Department, 185 Avenue de Verdun, 45800, Saint Jean de Braye, France
| | - Bertrand Friguet
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Ageing, B2A-IBPS, 75005 Paris, France
| | - Carine Nizard
- LVMH Recherche. Life Science Department, 185 Avenue de Verdun, 45800, Saint Jean de Braye, France
| | - Isabelle Petropoulos
- Sorbonne Université, CNRS, INSERM, Institut de Biologie Paris-Seine, Biological Adaptation and Ageing, B2A-IBPS, 75005 Paris, France.
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7
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Abstract
Forkhead box O (FOXO) transcription factors regulate diverse biological processes, affecting development, metabolism, stem cell maintenance and longevity. They have also been increasingly recognised as tumour suppressors through their ability to regulate genes essential for cell proliferation, cell death, senescence, angiogenesis, cell migration and metastasis. Mechanistically, FOXO proteins serve as key connection points to allow diverse proliferative, nutrient and stress signals to converge and integrate with distinct gene networks to control cell fate, metabolism and cancer development. In consequence, deregulation of FOXO expression and function can promote genetic disorders, metabolic diseases, deregulated ageing and cancer. Metastasis is the process by which cancer cells spread from the primary tumour often via the bloodstream or the lymphatic system and is the major cause of cancer death. The regulation and deregulation of FOXO transcription factors occur predominantly at the post-transcriptional and post-translational levels mediated by regulatory non-coding RNAs, their interactions with other protein partners and co-factors and a combination of post-translational modifications (PTMs), including phosphorylation, acetylation, methylation and ubiquitination. This review discusses the role and regulation of FOXO proteins in tumour initiation and progression, with a particular emphasis on cancer metastasis. An understanding of how signalling networks integrate with the FOXO transcription factors to modulate their developmental, metabolic and tumour-suppressive functions in normal tissues and in cancer will offer a new perspective on tumorigenesis and metastasis, and open up therapeutic opportunities for malignant diseases.
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8
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Jiang TX, Ma S, Han X, Luo ZY, Zhu QQ, Chiba T, Xie W, Lin K, Qiu XB. Proteasome activator PA200 maintains stability of histone marks during transcription and aging. Am J Cancer Res 2021; 11:1458-1472. [PMID: 33391545 PMCID: PMC7738882 DOI: 10.7150/thno.48744] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 10/01/2020] [Indexed: 12/13/2022] Open
Abstract
The epigenetic inheritance relies on stability of histone marks, but various diseases, including aging-related disorders, are usually associated with alterations of histone marks. Whether and how the proteasome is responsible for maintaining the histone marks during transcription and aging remain unclear. The core histones can be degraded by the atypical proteasome, which contains the proteasome activator PA200, in an acetylation-dependent manner during somatic DNA damage response and spermiogenesis. Methods: By utilizing a substitute of methionine to label proteins metabolically, we analyzed histone degradation genome-wide by sequencing the DNA fragments following pulse-chase assays. The genome-wide RNA-sequencing analysis was performed to analyze transcription and chromatin-immunoprecipitation (ChIP)-sequencing was used for analyses of histone marks. The experimental models included gene-manipulated cells (including both mouse and yeast), mouse liver, and mice. Results: Degradation of H4 or the transcription-coupled histone variant H3.3 could be suppressed by deletion of PA200 or its yeast ortholog Blm10. The histone deacetylase inhibitor accelerated the degradation rates of H3, while the mutations of the putative acetyl-lysine-binding region of PA200 abolished histone degradation in the G1-arrested cells. Deletion of PA200 dramatically altered deposition of the active transcriptional hallmarks (H3K4me3 and H3K56ac) and transcription, especially during cellular aging. Furthermore, deletion of PA200 or Blm10 accelerated cellular aging. Notably, the PA200-deficient mice displayed a range of aging-related deteriorations, including immune malfunction, anxiety-like behavior and shorter lifespan. Conclusion: PA200 promotes the transcription-coupled degradation of the core histones, and plays an important role in maintaining the stability of histone marks during transcription and aging.
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9
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Russo GL, Stampone E, Cervellera C, Borriello A. Regulation of p27 Kip1 and p57 Kip2 Functions by Natural Polyphenols. Biomolecules 2020; 10:biom10091316. [PMID: 32933137 PMCID: PMC7564754 DOI: 10.3390/biom10091316] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/01/2020] [Accepted: 09/09/2020] [Indexed: 12/14/2022] Open
Abstract
In numerous instances, the fate of a single cell not only represents its peculiar outcome but also contributes to the overall status of an organism. In turn, the cell division cycle and its control strongly influence cell destiny, playing a critical role in targeting it towards a specific phenotype. Several factors participate in the control of growth, and among them, p27Kip1 and p57Kip2, two proteins modulating various transitions of the cell cycle, appear to play key functions. In this review, the major features of p27 and p57 will be described, focusing, in particular, on their recently identified roles not directly correlated with cell cycle modulation. Then, their possible roles as molecular effectors of polyphenols’ activities will be discussed. Polyphenols represent a large family of natural bioactive molecules that have been demonstrated to exhibit promising protective activities against several human diseases. Their use has also been proposed in association with classical therapies for improving their clinical effects and for diminishing their negative side activities. The importance of p27Kip1 and p57Kip2 in polyphenols’ cellular effects will be discussed with the aim of identifying novel therapeutic strategies for the treatment of important human diseases, such as cancers, characterized by an altered control of growth.
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Affiliation(s)
- Gian Luigi Russo
- National Research Council, Institute of Food Sciences, 83100 Avellino, Italy;
- Correspondence: (G.L.R.); (A.B.); Tel.: +39-0825-299-331 (G.L.R.)
| | - Emanuela Stampone
- Department of Precision Medicine, University of Campania “Luigi Vanvitelli”, 81031 Napoli, Italy;
| | - Carmen Cervellera
- National Research Council, Institute of Food Sciences, 83100 Avellino, Italy;
| | - Adriana Borriello
- Department of Precision Medicine, University of Campania “Luigi Vanvitelli”, 81031 Napoli, Italy;
- Correspondence: (G.L.R.); (A.B.); Tel.: +39-0825-299-331 (G.L.R.)
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10
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From tea to treatment; epigallocatechin gallate and its potential involvement in minimizing the metabolic changes in cancer. Nutr Res 2019; 74:23-36. [PMID: 31918176 DOI: 10.1016/j.nutres.2019.12.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 12/02/2019] [Accepted: 12/06/2019] [Indexed: 01/09/2023]
Abstract
As the most abundant bioactive polyphenol in green tea, epigallocatechin gallate (EGCG) is a promising natural product that should be used in the discovery and development of potential drug leads. Due to its association with chemoprevention, EGCG may find a role in the development of therapeutics for prostate cancer. Natural products have long been used as a scaffold for drug design, as their already noted bioactivity can help accelerate the development of novel treatments. Green tea and the EGCG contained within have become associated with chemoprevention, and both in vitro and in vivo studies have correlated EGCG to inhibiting cell growth and increasing the metabolic stress of cancer cells, possibly giving merit to its long utilized therapeutic use in traditional therapies. There is accumulating evidence to suggest EGCG's role as an inhibitor of the phosphatidylinositol 3-kinase/protein kinase B/mammalian target of rapamycin signaling cascade, acting upon major axis points within cancer survival pathways. The purpose of this review is to examine the research conducted on tea along with EGCG in the areas of the treatment of and/or prevention of cancer. This review discusses Camellia sinensis as well as the bioactive phytochemical compounds contained within. Clinical uses of tea are explored, and possible pathways for activity are discussed before examining the evidence for EGCG's potential for acting on these processes. EGCG is identified as being a possible lead phytochemical for future drug design investigations.
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11
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Tano A, Kadota Y, Morimune T, Jam FA, Yukiue H, Bellier JP, Sokoda T, Maruo Y, Tooyama I, Mori M. The juvenility-associated long noncoding RNA Gm14230 maintains cellular juvenescence. J Cell Sci 2019; 132:jcs.227801. [PMID: 30872457 DOI: 10.1242/jcs.227801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 03/05/2019] [Indexed: 12/12/2022] Open
Abstract
Juvenile animals possess distinct properties that are missing in adults. These properties include capabilities for higher growth, faster wound healing, plasticity and regeneration. However, the molecular mechanisms underlying these juvenile physiological properties are not fully understood. To obtain insight into the distinctiveness of juveniles from adults at the molecular level, we assessed long noncoding RNAs (lncRNAs) that are highly expressed selectively in juvenile cells. The noncoding elements of the transcriptome were investigated in hepatocytes and cardiomyocytes isolated from juvenile and adult mice. Here, we identified 62 juvenility-associated lncRNAs (JAlncs), which are selectively expressed in both hepatocytes and cardiomyocytes from juvenile mice. Among these common (shared) JAlncs, Gm14230 is evolutionarily conserved and is essential for cellular juvenescence. Loss of Gm14230 impairs cell growth and causes cellular senescence. Gm14230 safeguards cellular juvenescence through recruiting the histone methyltransferase Ezh2 to Tgif2, thereby repressing the functional role of Tgif2 in cellular senescence. Thus, we identify Gm14230 as a juvenility-selective lncRNA required to maintain cellular juvenescence.
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Affiliation(s)
- Ayami Tano
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Yosuke Kadota
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Takao Morimune
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan.,Department of Pediatrics, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Faidruz Azura Jam
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Haruka Yukiue
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Jean-Pierre Bellier
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Tatsuyuki Sokoda
- Department of Pediatrics, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Yoshihiro Maruo
- Department of Pediatrics, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Ikuo Tooyama
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Masaki Mori
- Molecular Neuroscience Research Center (MNRC), Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
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12
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Chang E, Kim CY. Natural Products and Obesity: A Focus on the Regulation of Mitotic Clonal Expansion during Adipogenesis. Molecules 2019; 24:molecules24061157. [PMID: 30909556 PMCID: PMC6471203 DOI: 10.3390/molecules24061157] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 01/07/2023] Open
Abstract
Obesity is recognized as a worldwide health crisis. Obesity and its associated health complications such as diabetes, dyslipidemia, hypertension, and cardiovascular diseases impose a big social and economic burden. In an effort to identify safe, efficient, and long-term effective methods to treat obesity, various natural products with potential for inhibiting adipogenesis were revealed. This review aimed to discuss the molecular mechanisms underlying adipogenesis and the inhibitory effects of various phytochemicals, including those from natural sources, on the early stage of adipogenesis. We discuss key steps (proliferation and cell cycle) and their regulators (cell-cycle regulator, transcription factors, and intracellular signaling pathways) at the early stage of adipocyte differentiation as the mechanisms responsible for obesity.
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Affiliation(s)
- Eugene Chang
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03760, Korea.
| | - Choon Young Kim
- Department of Food and Nutrition, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Korea.
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13
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Neirijnck Y, Kühne F, Mayère C, Pavlova E, Sararols P, Foti M, Atanassova N, Nef S. Tumor Suppressor PTEN Regulates Negatively Sertoli Cell Proliferation, Testis Size, and Sperm Production In Vivo. Endocrinology 2019; 160:387-398. [PMID: 30576429 DOI: 10.1210/en.2018-00892] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 12/17/2018] [Indexed: 11/19/2022]
Abstract
The IGFs are the major intratesticular factors regulating immature Sertoli cell proliferation and are, therefore, critical to establish the magnitude of sperm production. However, the intratesticular source of IGF production and the downstream signaling pathway mediating IGF-dependent Sertoli cell proliferation remain unclear. Single-cell RNA sequencing on mouse embryonic testis revealed a robust expression of Igf1 and Igf2 in interstitial steroidogenic progenitors, suggesting that IGFs exert paracrine actions on immature Sertoli cells. To elucidate the intracellular signaling mechanism that underlies the proliferative effects of IGFs on immature Sertoli cells, we have generated mice with Sertoli cell-specific deletion of the Pten gene, a negative regulator of the phosphatidylinositol-3 kinase (PI3K)/AKT pathway, alone or together with the insulin receptor (Insr) and the IGF1 receptor (Igf1r). Although ablation of Pten appears dispensable for Sertoli cell proliferation and spermatogenesis, inactivation of Pten in the absence of Insr and Igf1r rescued the Sertoli cell proliferation rate during late fetal development, testis size, and sperm production. Overall, these findings suggest that IGFs secreted by interstitial progenitor cells act in a paracrine fashion to promote the proliferation of immature Sertoli cells through the IGF/PTEN/PI3K pathway.
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Affiliation(s)
- Yasmine Neirijnck
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Françoise Kühne
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Chloé Mayère
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Ekaterina Pavlova
- Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Pauline Sararols
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Michelangelo Foti
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Nina Atanassova
- Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Serge Nef
- Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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14
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Fettucciari K, Macchioni L, Davidescu M, Scarpelli P, Palumbo C, Corazzi L, Marchegiani A, Cerquetella M, Spaterna A, Marconi P, Bassotti G. Clostridium difficile toxin B induces senescence in enteric glial cells: A potential new mechanism of Clostridium difficile pathogenesis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2018; 1865:1945-1958. [PMID: 30296499 DOI: 10.1016/j.bbamcr.2018.10.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 10/02/2018] [Accepted: 10/04/2018] [Indexed: 02/06/2023]
Abstract
Clostridium difficile infection (CDI) causes nosocomial/antibiotic-associated diarrhea and pseudomembranous colitis, with dramatic incidence/mortality worldwide. C. difficile virulence factors are toxin A and toxin B (TcdB) which cause cytopathic/cytotoxic effects and inflammation. Until now studies were focused on molecular effects of C. difficile toxins (Tcds) on different cells while unexplored aspect is the status/fate of cells that survived their cytotoxicity. Recently we demonstrated that enteric glial cells (EGCs) are susceptible to TcdB cytotoxicity, but several EGCs survived and were irreversibly cell-cycle arrested and metabolically active, suggesting that EGCs could became senescent. This is important because allowed us to evaluate the not explored status/fate of cells surviving Tcds cytotoxicity, and particularly if TcdB induces senescence in EGCs. Rat-transformed EGCs were treated with 10 ng/ml TcdB for 6 h-48 h, or for 48 h, followed by incubation for additional 4 or 11 days in absence of TcdB (6 or 13 total days). Senescence markers/effectors were examined by specific assays. TcdB induces senescence in EGCs, as demonstrated by the senescence markers: irreversible cell-cycle arrest, senescence-associated-β‑galactosidase positivity, flat morphology, early and persistent DNA damage (ATM and H2AX phosphorylation), p27 overexpression, pRB hypophosphorylation, c‑Myc, cyclin B1, cdc2 and phosphorylated-cdc2 downregulation, Sirtuin‑2 and Sirtuin‑3 overexpression. TcdB-induced EGC senescence is dependent by JNK and AKT activation but independent by ROS, p16 and p53/p21 pathways. In conclusion, TcdB induces senescence in EGCs. The extrapolation of these results to CDI leads to hypothesize that EGCs that survived TcdB, once they have acquired a senescence state, could cause irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), and tumors due to persistent inflammation, transfer of senescence status and stimulation of pre-neoplastic cells.
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Affiliation(s)
- Katia Fettucciari
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy.
| | - Lara Macchioni
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy
| | - Magdalena Davidescu
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy
| | - Paolo Scarpelli
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy
| | - Camilla Palumbo
- Department of Clinical Sciences and Translational Medicine, Tor Vergata University, Rome, Italy
| | - Lanfranco Corazzi
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy
| | - Andrea Marchegiani
- School of Biosciences and Veterinary Medicine, University of Camerino, Macerata, Italy
| | - Matteo Cerquetella
- School of Biosciences and Veterinary Medicine, University of Camerino, Macerata, Italy
| | - Andrea Spaterna
- School of Biosciences and Veterinary Medicine, University of Camerino, Macerata, Italy
| | - Pierfrancesco Marconi
- Department of Experimental Medicine, University of Perugia Medical School, Perugia, Italy
| | - Gabrio Bassotti
- Department of Medicine, University of Perugia Medical School, Perugia, Italy; Gastroenterology and Hepatology Section, Santa Maria della Misericordia Hospital, Perugia, Italy
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15
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Sulforaphane attenuates bisphenol A-induced 3T3-L1 adipocyte differentiation through cell cycle arrest. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.02.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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16
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Chen CY, Chen J, He L, Stiles BL. PTEN: Tumor Suppressor and Metabolic Regulator. Front Endocrinol (Lausanne) 2018; 9:338. [PMID: 30038596 PMCID: PMC6046409 DOI: 10.3389/fendo.2018.00338] [Citation(s) in RCA: 318] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 06/05/2018] [Indexed: 12/19/2022] Open
Abstract
Phosphatase and Tensin Homolog deleted on Chromosome 10 (PTEN) is a dual phosphatase with both protein and lipid phosphatase activities. PTEN was first discovered as a tumor suppressor with growth and survival regulatory functions. In recent years, the function of PTEN as a metabolic regulator has attracted significant attention. As the lipid phosphatase that dephosphorylates phosphatidylinositol-3, 4, 5-phosphate (PIP3), PTEN reduces the level of PIP3, a critical 2nd messenger mediating the signal of not only growth factors but also insulin. In this review, we introduced the discovery of PTEN, the PTEN-regulated canonical and nuclear signals, and PTEN regulation. We then focused on the role of PTEN and PTEN-regulated signals in metabolic regulation. This included the role of PTEN in glycolysis, gluconeogenesis, glycogen synthesis, lipid metabolism as well as mitochondrial metabolism. We also included how PTEN and PTEN regulated metabolic functions may act paradoxically toward insulin sensitivity and tumor metabolism and growth. Further understanding of how PTEN regulates metabolism and how such regulations lead to different biological outcomes is necessary for interventions targeting at the PTEN-regulated signals in either cancer or diabetes treatment.
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Affiliation(s)
- Chien-Yu Chen
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, United States
| | - Jingyu Chen
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, United States
| | - Lina He
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, United States
| | - Bangyan L. Stiles
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, United States
- Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
- *Correspondence: Bangyan L. Stiles
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17
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Nunes AM, Barraza-Flores P, Smith CR, Burkin DJ. Integrin α7: a major driver and therapeutic target for glioblastoma malignancy. Stem Cell Investig 2017; 4:97. [PMID: 29359136 PMCID: PMC5763033 DOI: 10.21037/sci.2017.12.01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 11/29/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Andreia M Nunes
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA
| | - Pamela Barraza-Flores
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA
| | - Christina R Smith
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA
| | - Dean J Burkin
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA
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18
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Yao S, Fan LYN, Lam EWF. The FOXO3-FOXM1 axis: A key cancer drug target and a modulator of cancer drug resistance. Semin Cancer Biol 2017; 50:77-89. [PMID: 29180117 PMCID: PMC6565931 DOI: 10.1016/j.semcancer.2017.11.018] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 10/30/2017] [Accepted: 11/23/2017] [Indexed: 12/11/2022]
Abstract
The FOXO3 and FOXM1 forkhead box transcription factors, functioning downstream of the essential PI3K-Akt, Ras-ERK and JNK/p38MAPK signalling cascades, are crucial for cell proliferation, differentiation, cell survival, senescence, DNA damage repair and cell cycle control. The development of resistance to both conventional and newly emerged molecularly targeted therapies is a major challenge confronting current cancer treatment in the clinic. Intriguingly, the mechanisms of resistance to ‘classical’ cytotoxic chemotherapeutics and to molecularly targeted therapies are invariably linked to deregulated signalling through the FOXO3 and FOXM1 transcription factors. This is owing to the involvement of FOXO3 and FOXM1 in the regulation of genes linked to crucial drug action-related cellular processes, including stem cell renewal, DNA repair, cell survival, drug efflux, and deregulated mitosis. A better understanding of the mechanisms regulating the FOXO3-FOXM1 axis, as well as their downstream transcriptional targets and functions, may render these proteins reliable and early diagnostic/prognostic factors as well as crucial therapeutic targets for cancer treatment and importantly, for overcoming chemotherapeutic drug resistance.
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Affiliation(s)
- Shang Yao
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK
| | - Lavender Yuen-Nam Fan
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK
| | - Eric Wing-Fai Lam
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London W12 0NN, UK.
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19
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Chen RJ, Wu PH, Ho CT, Way TD, Pan MH, Chen HM, Ho YS, Wang YJ. P53-dependent downregulation of hTERT protein expression and telomerase activity induces senescence in lung cancer cells as a result of pterostilbene treatment. Cell Death Dis 2017; 8:e2985. [PMID: 28796247 PMCID: PMC5596539 DOI: 10.1038/cddis.2017.333] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 06/13/2017] [Accepted: 06/19/2017] [Indexed: 12/12/2022]
Abstract
Cellular senescence is characterized by permanent cell cycle arrest, triggered by a variety of stresses, such as telomerase inhibition, and it is recognized as a tumor-suppressor mechanism. In recent years, telomerase has become an important therapeutic target in several cancers; inhibition of telomerase can induce senescence via the DNA damage response (DDR). Pterostilbene (PT), a dimethyl ether analog of resveratrol, possesses a variety of biological functions, including anticancer effects; however, the molecular mechanisms underlying these effects are not fully understood. In this study, we investigated the possible mechanisms of PT-induced senescence through telomerase inhibition in human non-small cell lung cancer cells and delineated the role of p53 in senescence. The results indicated that PT-induced senescence is characterized by a flattened morphology, positive staining for senescence-associated-β galactosidase activity, and the formation of senescence-associated heterochromatic foci. Telomerase activity and protein expression was significantly decreased in H460 (p53 wild type) cells compared with H1299 (p53 null) cells and p53 knockdown H460 cells (H460-p53-). A more detailed mechanistic study revealed that PT-induced senescence partially occurred via a p53-dependent mechanism, triggering inhibition of telomerase activity and protein expression, and leading to the DDR, S phase arrest and, finally, cellular senescence. This study is the first to explore the novel anticancer mechanism of PT senescence induction via the inhibition of telomerase in lung cancer cells.
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Affiliation(s)
- Rong-Jane Chen
- Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Food Safety/Hygiene and Risk Management, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Pei-Hsuan Wu
- Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chi-Tang Ho
- Department of Food Science, Rutgers University, New Brunswick, NJ, USA
| | - Tzong-Der Way
- Department of Biological Science and Technology, College of Life Sciences, China Medical University, Taichung, Taiwan
| | - Min-Hsiung Pan
- Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan.,Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization; Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains; Huanggang Normal University, Huanggang, Hubei, China
| | - Hsiu-Min Chen
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yuan-Soon Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan
| | - Ying-Jan Wang
- Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Food Safety/Hygiene and Risk Management, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Biomedical Informatics, Asia University, Taichung, Taiwan.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan.,Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
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20
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Yamaguchi R, Perkins G. Deconstructing Signaling Pathways in Cancer for Optimizing Cancer Combination Therapies. Int J Mol Sci 2017. [PMCID: PMC5486080 DOI: 10.3390/ijms18061258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A single cancer cell left behind after surgery and/or chemotherapy could cause a recurrence of cancer. It is our belief that the failure of chemotherapies is the failure to induce apoptosis in all cancer cells. Given the extraordinary heterogeneity of cancer, it is very difficult to eliminate all cancer cells with a single agent targeting a particular gene product. Furthermore, combinations of any two or three agents exhibiting some proven efficacy on a particular cancer type have not fared better, often compounding adverse effects without evidence of expected synergistic effects. Thus, it is imperative that a way be found to select candidates that when combined, will (1) synergize, making the combination therapy greater than the sum of its parts, and (2) target all the cancer cells in a patient. In this article, we discuss our experience and relation to current evidence in the cancer treatment literature in which, by deconstructing signaling networks, we have identified a lynchpin that connects the growth signals present in cancer with mitochondria-dependent apoptotic pathways. By targeting this lynchpin, we have added a key component to a combination therapy that sensitizes cancer cells for apoptosis.
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Affiliation(s)
- Ryuji Yamaguchi
- Department of Anesthesia, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
- Correspondence: ; Tel.: +81-72-804-2685
| | - Guy Perkins
- National Center for Microscopy and Imaging Research, School of Medicine, University of California San Diego, La Jolla, CA 92093, USA;
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Identification of differentially expressed proteins in retinoblastoma tumors using mass spectrometry-based comparative proteomic approach. J Proteomics 2017; 159:77-91. [PMID: 28232133 DOI: 10.1016/j.jprot.2017.02.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 01/24/2017] [Accepted: 02/10/2017] [Indexed: 12/17/2022]
Abstract
In India, retinoblastoma is among the top five childhood cancers. Children mostly present with extraocular extension and high risk features that results in unsatisfactory treatment and low survival rate. In addition, lack of potential therapeutic and prognostic targets is another challenge in the management of retinoblastoma. We studied comparative proteome of retinoblastoma patients (HPV positive and negative (n=4 each) and controls (n=4), in order to identify potential retinoblastoma-specific protein targets. 2D-DIGE coupled MALDI-TOF/TOF mass spectrometry identified 39 unique proteins. Highly deregulated proteins were GFAP,RBP3,APOA1,CRYAA,CRABP1,SAG and TF. Gene ontology (Panther 7.0) revealed majority of proteins to be associated with metabolic processes (26%) and catalytic activity (38%). 8 proteins were significantly upregulated in HPV positive vis-a-vis HPV negative cases. Patient group exhibited 12 upregulated and 18 downregulated proteins compared to controls. Pathway and network analysis (IPA software) revealed CTNNB1 as most significantly regulated signalling pathway in HPV positive than HPV negative retinoblastoma. The trends in transcriptional change of 9 genes were consistent with those at proteomic level. The Western blot analysis confirmed the expression pattern of RBP3,GFAP and CRABP1. We suggest GFAP,RBP3,CRABP1,CRYAAA,APOA1 and SAG as prospective targets that could further be explored as potential candidates in therapy and may further assist in studying the disease mechanism. SIGNIFICANCE In this study we evaluated tumor tissue specimens from retinoblastoma patients and identified 39 differentially regulated proteins compared to healthy retina. From these, we propose RBP3, CRABP1, GFAP, CRYAA, APOA1 and SAG as promising proteomic signatures that could further be explored as efficient prognostic and therapeutic targets in retinoblastoma. The present study is not only a contribution to the ongoing endeavour for the discovery of proteomic signatures in retinoblastoma, but, may also act as a starting point for future studies aimed at uncovering novel targets for further therapeutic interventions and improving patient outcomes.
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Shingyochi Y, Kanazawa S, Tajima S, Tanaka R, Mizuno H, Tobita M. A Low-Level Carbon Dioxide Laser Promotes Fibroblast Proliferation and Migration through Activation of Akt, ERK, and JNK. PLoS One 2017; 12:e0168937. [PMID: 28045948 PMCID: PMC5207507 DOI: 10.1371/journal.pone.0168937] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 12/08/2016] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Low-level laser therapy (LLLT) with various types of lasers promotes fibroblast proliferation and migration during the process of wound healing. Although LLLT with a carbon dioxide (CO2) laser was also reported to promote wound healing, the underlying mechanisms at the cellular level have not been previously described. Herein, we investigated the effect of LLLT with a CO2 laser on fibroblast proliferation and migration. MATERIALS AND METHODS Cultured human dermal fibroblasts were prepared. MTS and cell migration assays were performed with fibroblasts after LLLT with a CO2 laser at various doses (0.1, 0.5, 1.0, 2.0, or 5.0 J/cm2) to observe the effects of LLLT with a CO2 laser on the proliferation and migration of fibroblasts. The non-irradiated group served as the control. Moreover, western blot analysis was performed using fibroblasts after LLLT with a CO2 laser to analyze changes in the activities of Akt, extracellular signal-regulated kinase (ERK), and Jun N-terminal kinase (JNK), which are signaling molecules associated with cell proliferation and migration. Finally, the MTS assay, a cell migration assay, and western blot analysis were performed using fibroblasts treated with inhibitors of Akt, ERK, or JNK before LLLT with a CO2 laser. RESULTS In MTS and cell migration assays, fibroblast proliferation and migration were promoted after LLLT with a CO2 laser at 1.0 J/cm2. Western blot analysis revealed that Akt, ERK, and JNK activities were promoted in fibroblasts after LLLT with a CO2 laser at 1.0 J/cm2. Moreover, inhibition of Akt, ERK, or JNK significantly blocked fibroblast proliferation and migration. CONCLUSIONS These findings suggested that LLLT with a CO2 laser would accelerate wound healing by promoting the proliferation and migration of fibroblasts. Activation of Akt, ERK, and JNK was essential for CO2 laser-induced proliferation and migration of fibroblasts.
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Affiliation(s)
- Yoshiaki Shingyochi
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
| | - Shigeyuki Kanazawa
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
| | - Satoshi Tajima
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
| | - Rica Tanaka
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
| | - Hiroshi Mizuno
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
| | - Morikuni Tobita
- Department of Plastic and Reconstructive Surgery, Juntendo University School of Medicine, Hongo, Bunkyo-ku, Tokyo, Japan
- * E-mail:
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23
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Nestal de Moraes G, Bella L, Zona S, Burton MJ, Lam EWF. Insights into a Critical Role of the FOXO3a-FOXM1 Axis in DNA Damage Response and Genotoxic Drug Resistance. Curr Drug Targets 2016; 17:164-77. [PMID: 25418858 PMCID: PMC5403963 DOI: 10.2174/1389450115666141122211549] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/06/2014] [Accepted: 11/19/2014] [Indexed: 11/22/2022]
Abstract
FOXO3a and FOXM1 are two forkhead transcription factors with antagonistic roles in cancer and DNA damage response. FOXO3a functions like a typical tumour suppressor, whereas FOXM1 is a potent oncogene aberrantly overexpressed in genotoxic resistant cancers. FOXO3a not only represses FOXM1 expression but also its transcriptional output. Recent research has provided novel insights into a central role for FOXO3a and FOXM1 in DNA damage response. The FOXO3a-FOXM1 axis plays a pivotal role in DNA damage repair and the accompanied cellular response through regulating the expression of genes essential for DNA damage sensing, mediating, signalling and repair as well as for senescence, cell cycle and cell death control. In this manner, the FOXO3a-FOXM1 axis also holds the key to cell fate decision in response to genotoxic therapeutic agents and controls the equilibrium between DNA repair and cell termination by cell death or senescence. As a consequence, inhibition of FOXM1 or reactivation of FOXO3a in cancer cells could enhance the efficacy of DNA damaging cancer therapies by decreasing the rate of DNA repair and cell survival while increasing senescence and cell death. Conceptually, targeting FOXO3a and FOXM1 may represent a promising molecular therapeutic option for improving the efficacy and selectivity of DNA damage agents, particularly in genotoxic agent resistant cancer. In addition, FOXO3a, FOXM1 and their downstream transcriptional targets may also be reliable diagnostic biomarkers for predicting outcome, for selecting therapeutic options, and for monitoring treatments in DNA-damaging agent therapy.
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Affiliation(s)
| | | | | | | | - Eric W-F Lam
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, UK.
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24
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Yamaguchi Y, Madhyastha H, Madhyastha R, Choijookhuu N, Hishikawa Y, Pengjam Y, Nakajima Y, Maruyama M. Arsenic acid inhibits proliferation of skin fibroblasts, and increases cellular senescence through ROS mediated MST1-FOXO signaling pathway. J Toxicol Sci 2016; 41:105-13. [PMID: 26763397 DOI: 10.2131/jts.41.105] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Arsenic exposure through drinking water is a major public health problem. It causes a number of toxic effects on skin. Arsenic has been reported to inhibit cell proliferation in in vitro conditions. However, reports about the molecular mechanisms are limited. Here, we investigated the mechanism involved in arsenic acid-mediated inhibition of cell proliferation using mouse skin fibroblast cell line. The present study found that 10 ppm arsenic acid inhibited cell proliferation, without any effect on cell death. Arsenic acid induced the generation of reactive oxygen species (ROS), resulting in oxidative stress to DNA. It also activated the mammalian Ste20-like protein kinase 1 (MST1); however the serine/threonine kinase Akt was downregulated. Forkhead box O (FOXO) transcription factors are activated through phosphorylation by MST1 under stress conditions. They are inhibited by phosphorylation by Akt through external and internal stimuli. Activation of FOXOs results in their nuclear localization, followed by an increase in transcriptional activity. Our results showed that arsenic induced the nuclear translocation of FOXO1 and FOXO3a, and altered the cell cycle, with cells accumulating at the G2/M phase. These effects caused cellular senescence. Taken together, our results indicate that arsenic acid inhibited cell proliferation through cellular senescence process regulated by MST1-FOXO signaling pathway.
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Affiliation(s)
- Yuya Yamaguchi
- Department of Applied Physiology, Faculty of Medicine, University of Miyazaki
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25
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BRCA1 positively regulates FOXO3 expression by restricting FOXO3 gene methylation and epigenetic silencing through targeting EZH2 in breast cancer. Oncogenesis 2016; 5:e214. [PMID: 27043660 PMCID: PMC4848836 DOI: 10.1038/oncsis.2016.23] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 02/12/2016] [Accepted: 02/17/2016] [Indexed: 01/09/2023] Open
Abstract
BRCA1 mutation or depletion correlates with basal-like phenotype and poor prognosis in breast cancer but the underlying reason remains elusive. RNA and protein analysis of a panel of breast cancer cell lines revealed that BRCA1 deficiency is associated with downregulation of the expression of the pleiotropic tumour suppressor FOXO3. Knockdown of BRCA1 by small interfering RNA (siRNA) resulted in downregulation of FOXO3 expression in the BRCA1-competent MCF-7, whereas expression of BRCA1 restored FOXO3 expression in BRCA1-defective HCC70 and MDA-MB-468 cells, suggesting a role of BRCA1 in the control of FOXO3 expression. Treatment of HCC70 and MDA-MB-468 cells with either the DNA methylation inhibitor 5-aza-2'-deoxycitydine, the N-methyltransferase enhancer of zeste homologue 2 (EZH2) inhibitor GSK126 or EZH2 siRNA induced FOXO3 mRNA and protein expression, but had no effect on the BRCA1-competent MCF-7 cells. Chromatin immunoprecipitation (ChIP) analysis demonstrated that BRCA1, EZH2, DNMT1/3a/b and histone H3 lysine 27 trimethylation (H3K27me3) are recruited to the endogenous FOXO3 promoter, further advocating that these proteins interact to modulate FOXO3 methylation and expression. In addition, ChIP results also revealed that BRCA1 depletion promoted the recruitment of the DNA methyltransferases DNMT1/3a/3b and the enrichment of the EZH2-mediated transcriptional repressive epigenetic marks H3K27me3 on the FOXO3 promoter. Methylated DNA immunoprecipitation assays also confirmed increased CpG methylation of the FOXO3 gene on BRCA1 depletion. Analysis of the global gene methylation profiles of a cohort of 33 familial breast tumours revealed that FOXO3 promoter methylation is significantly associated with BRCA1 mutation. Furthermore, immunohistochemistry further suggested that FOXO3 expression was significantly associated with BRCA1 status in EZH2-positive breast cancer. Consistently, high FOXO3 and EZH2 mRNA levels were significantly associated with good and poor prognosis in breast cancer, respectively. Together, these data suggest that BRCA1 can prevent and reverse FOXO3 suppression via inhibiting EZH2 and, consequently, its ability to recruit the transcriptional repressive H3K27me3 histone marks and the DNA methylases DNMT1/3a/3b, to induce DNA methylation and gene silencing on the FOXO3 promoter.
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26
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Lechman ER, Gentner B, Ng SWK, Schoof EM, van Galen P, Kennedy JA, Nucera S, Ciceri F, Kaufmann KB, Takayama N, Dobson SM, Trotman-Grant A, Krivdova G, Elzinga J, Mitchell A, Nilsson B, Hermans KG, Eppert K, Marke R, Isserlin R, Voisin V, Bader GD, Zandstra PW, Golub TR, Ebert BL, Lu J, Minden M, Wang JCY, Naldini L, Dick JE. miR-126 Regulates Distinct Self-Renewal Outcomes in Normal and Malignant Hematopoietic Stem Cells. Cancer Cell 2016; 29:214-28. [PMID: 26832662 PMCID: PMC4749543 DOI: 10.1016/j.ccell.2015.12.011] [Citation(s) in RCA: 153] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 07/13/2015] [Accepted: 12/21/2015] [Indexed: 12/16/2022]
Abstract
To investigate miRNA function in human acute myeloid leukemia (AML) stem cells (LSC), we generated a prognostic LSC-associated miRNA signature derived from functionally validated subpopulations of AML samples. For one signature miRNA, miR-126, high bioactivity aggregated all in vivo patient sample LSC activity into a single sorted population, tightly coupling miR-126 expression to LSC function. Through functional studies, miR-126 was found to restrain cell cycle progression, prevent differentiation, and increase self-renewal of primary LSC in vivo. Compared with prior results showing miR-126 regulation of normal hematopoietic stem cell (HSC) cycling, these functional stem effects are opposite between LSC and HSC. Combined transcriptome and proteome analysis demonstrates that miR-126 targets the PI3K/AKT/MTOR signaling pathway, preserving LSC quiescence and promoting chemotherapy resistance.
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Affiliation(s)
- Eric R Lechman
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Bernhard Gentner
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy; Hematology and Bone Marrow Transplantation Unit, San Raffaele Hospital, Milan 20132, Italy
| | - Stanley W K Ng
- Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5G 2M9, Canada; The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Erwin M Schoof
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Peter van Galen
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - James A Kennedy
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Silvia Nucera
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy
| | - Fabio Ciceri
- Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy; Hematology and Bone Marrow Transplantation Unit, San Raffaele Hospital, Milan 20132, Italy
| | - Kerstin B Kaufmann
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Naoya Takayama
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Stephanie M Dobson
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Aaron Trotman-Grant
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Gabriela Krivdova
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Janneke Elzinga
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Amanda Mitchell
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Björn Nilsson
- Department of Hematology and Transfusion Medicine, Lund University Hospital, Lund 221 84, Sweden
| | - Karin G Hermans
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Kolja Eppert
- Department of Pediatrics, McGill University and The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - Rene Marke
- Laboratory of Pediatric Oncology, Radboud University Medical Center, Nijmegen, 6500 HB, Netherlands
| | - Ruth Isserlin
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Veronique Voisin
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Gary D Bader
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Peter W Zandstra
- Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5G 2M9, Canada; The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Todd R Golub
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA
| | - Benjamin L Ebert
- Division of Hematology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Jun Lu
- Yale Stem Cell Center, Yale Cancer Center, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Mark Minden
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Jean C Y Wang
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Luigi Naldini
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy
| | - John E Dick
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada; Princess Margaret Cancer Research Tower, Room 8-301, 101 College Street, Toronto M5G 1L7, Canada.
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27
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Gong C, Fujino K, Monteiro LJ, Gomes AR, Drost R, Davidson-Smith H, Takeda S, Khoo US, Jonkers J, Sproul D, Lam EWF. FOXA1 repression is associated with loss of BRCA1 and increased promoter methylation and chromatin silencing in breast cancer. Oncogene 2015; 34:5012-24. [PMID: 25531315 PMCID: PMC4430311 DOI: 10.1038/onc.2014.421] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 10/01/2014] [Accepted: 11/15/2014] [Indexed: 12/11/2022]
Abstract
FOXA1 expression correlates with the breast cancer luminal subtype and patient survival. RNA and protein analysis of a panel of breast cancer cell lines revealed that BRCA1 deficiency is associated with the downregulation of FOXA1 expression. Knockdown of BRCA1 resulted in the downregulation of FOXA1 expression and enhancement of FOXA1 promoter methylation in MCF-7 breast cancer cells, whereas the reconstitution of BRCA1 in Brca1-deficent mouse mammary epithelial cells (MMECs) promoted Foxa1 expression and methylation. These data suggest that BRCA1 suppresses FOXA1 hypermethylation and silencing. Consistently, the treatment of MMECs with the DNA methylation inhibitor 5-aza-2'-deoxycitydine induced Foxa1 mRNA expression. Furthermore, treatment with GSK126, an inhibitor of EZH2 methyltransferase activity, induced FOXA1 expression in BRCA1-deficient but not in BRCA1-reconstituted MMECs. Likewise, the depletion of EZH2 by small interfering RNA enhanced FOXA1 mRNA expression. Chromatin immunoprecipitation (ChIP) analysis demonstrated that BRCA1, EZH2, DNA methyltransferases (DNMT)1/3a/3b and H3K27me3 are recruited to the endogenous FOXA1 promoter, further supporting the hypothesis that these proteins interact to modulate FOXA1 methylation and repression. Further co-immunoprecipitation and ChIP analysis showed that both BRCA1 and DNMT3b form complexes with EZH2 but not with each other, consistent with the notion that BRCA1 binds to EZH2 and negatively regulates its methyltransferase activity. We also found that EZH2 promotes and BRCA1 impairs the deposit of the gene silencing histone mark H3K27me3 on the FOXA1 promoter. These associations were validated in a familial breast cancer patient cohort. Integrated analysis of the global gene methylation and expression profiles of a set of 33 familial breast tumours revealed that FOXA1 promoter methylation is inversely correlated with the transcriptional expression of FOXA1 and that BRCA1 mutation breast cancer is significantly associated with FOXA1 methylation and downregulation of FOXA1 expression, providing physiological evidence to our findings that FOXA1 expression is regulated by methylation and chromatin silencing and that BRCA1 maintains FOXA1 expression through suppressing FOXA1 gene methylation in breast cancer.
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Affiliation(s)
- C Gong
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
- Department of Pathology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - K Fujino
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
- Department of Obstetrics & Gynecology, Faculty of Medicine, Juntendo University, Bunkyoku, Tokyo, Japan
| | - L J Monteiro
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - A R Gomes
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - R Drost
- Division of Molecular Pathology and Cancer Genomics Centre Netherlands, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - H Davidson-Smith
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - S Takeda
- Department of Obstetrics & Gynecology, Faculty of Medicine, Juntendo University, Bunkyoku, Tokyo, Japan
| | - U S Khoo
- Department of Pathology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - J Jonkers
- Division of Molecular Pathology and Cancer Genomics Centre Netherlands, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - D Sproul
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK
| | - E W-F Lam
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
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28
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Sung SY, Wu IH, Chuang PH, Petros JA, Wu HC, Zeng HJ, Huang WC, Chung LWK, Hsieh CL. Targeting L1 cell adhesion molecule expression using liposome-encapsulated siRNA suppresses prostate cancer bone metastasis and growth. Oncotarget 2015; 5:9911-29. [PMID: 25294816 PMCID: PMC4259447 DOI: 10.18632/oncotarget.2478] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The L1 cell adhesion molecule (L1CAM) has been implicated in tumor progression of many types of cancers, but its role in prostate cancer and its application in targeted gene therapy have not been investigated. Herein, we demonstrated that the L1CAM was expressed in androgen-insensitive and highly metastatic human prostate cancer cell lines. The correlation between L1CAM expression and prostate cancer metastasis was also validated in serum samples of prostate cancer patients. Knockdown of L1CAM expression in prostate cancer cells by RNA interference significantly decreased their aggressive behaviors, including colony formation, migration and invasion in vitro, and tumor formation in a metastatic murine model. These anti-malignant phenotypes of L1CAM-knockdown cancer cells were accompanied by G0/G1 cell cycle arrest and suppression of matrix metalloproteinase (MMP)-2 and MMP-9 expression and nuclear factor NF-κB activation. In vivo targeting of L1CAM expression using liposome-encapsulated L1CAM siRNAs effectively inhibited prostate cancer growth in mouse bone, which was associated with decreased L1CAM expression and cell proliferation by tumor cells. These results provide the first evidence for L1CAM being a major contributor to prostate cancer metastasis and translational application of siRNA-based L1CAM-targeted therapy.
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Affiliation(s)
- Shian-Ying Sung
- The Ph.D. Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan. Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan. These authors contributed equally to this work
| | - I-Hui Wu
- Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan. These authors contributed equally to this work
| | - Pei-Hsin Chuang
- Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan. These authors contributed equally to this work
| | - John A Petros
- Department of Urology, Emory University, Atlanta, GA, USA. Department of Urology, Atlanta VA Medical Center, Decatur GA, USA
| | - Hsi-Chin Wu
- School of Medicine, China Medical University, Taichung, Taiwan
| | - Hong-Jie Zeng
- The Ph.D. Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Wei-Chien Huang
- Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan
| | - Leland W K Chung
- Department of Urology, Emory University, Atlanta, GA, USA. Department of Medicine, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Chia-Ling Hsieh
- The Ph.D. Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan. Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan. Department of Urology, Emory University, Atlanta, GA, USA. Department of Biotechnology, Asia University, Wufeng, Taichung, Taiwan
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29
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Liu S, Wang X, Zhao Q, Liu S, Zhang H, Shi J, Li N, Lei X, Zhao H, Deng Z, Cao Y, Ning L, Xia G, Duan E. Senescence of human skin-derived precursors regulated by Akt-FOXO3-p27(KIP¹)/p15(INK⁴b) signaling. Cell Mol Life Sci 2015; 72:2949-60. [PMID: 25753771 PMCID: PMC11113525 DOI: 10.1007/s00018-015-1877-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 02/26/2015] [Accepted: 02/27/2015] [Indexed: 12/17/2022]
Abstract
Multipotent skin-derived precursors (SKPs) are dermal stem cells with the capacity to reconstitute the dermis and other tissues, such as muscles and the nervous system. Thus, the easily available human SKPs (hSKPs) hold great promises in regenerative medicine. However, long-term expansion is difficult for hSKPs in vitro. We previously demonstrated that hSKPs senesced quickly under routine culture conditions. To identify the underlying mechanisms so as to find an effective way to expand hSKPs, time-dependent microarray analysis of gene expression in hSKPs during in vitro culture was performed. We found that the senescence of hSKPs had a unique gene expression pattern that differs from reported typical senescence. Subsequent investigation ruled out the role of DNA damage and classical p53 and p16(INK4a) signaling in hSKP senescence. Examination of cyclin-dependent kinase inhibitors revealed the involvement of p15(INK4b) and p27(KIP1). Further exploration about upstream signals indicated the contribution of Akt hypo-activity and FOXO3 to hSKP senescence. Forced activation of Akt and knockdown of FOXO3, p15(INK4b) and p27(KIP1) effectively inhibited hSKP senescence and promoted hSKP proliferation. The unique senescent phenotype of human dermal stem cells and the role of Akt-FOXO3-p27(KIP1)/p15(INK4b) signaling in regulating hSKP senescence provide novel insights into the senescence and self-renewal regulation of adult stem cells. The present study also points out a way to propagate hSKPs in vitro so as to fulfill their promises in regenerative medicine.
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Affiliation(s)
- Shuang Liu
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Xinyue Wang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Qian Zhao
- State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan Xilu, Haidian District, Beijing, 100193 China
| | - Shu Liu
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Huishan Zhang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Junchao Shi
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Na Li
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Xiaohua Lei
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Huashan Zhao
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Zhili Deng
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Yujing Cao
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Lina Ning
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
| | - Guoliang Xia
- State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan Xilu, Haidian District, Beijing, 100193 China
| | - Enkui Duan
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101 China
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30
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Carnero A, Blanco-Aparicio C, Kondoh H, Lleonart ME, Martinez-Leal JF, Mondello C, Ivana Scovassi A, Bisson WH, Amedei A, Roy R, Woodrick J, Colacci A, Vaccari M, Raju J, Al-Mulla F, Al-Temaimi R, Salem HK, Memeo L, Forte S, Singh N, Hamid RA, Ryan EP, Brown DG, Wise JP, Wise SS, Yasaei H. Disruptive chemicals, senescence and immortality. Carcinogenesis 2015; 36 Suppl 1:S19-37. [PMID: 26106138 PMCID: PMC4565607 DOI: 10.1093/carcin/bgv029] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 08/04/2014] [Accepted: 08/05/2014] [Indexed: 12/16/2022] Open
Abstract
Carcinogenesis is thought to be a multistep process, with clonal evolution playing a central role in the process. Clonal evolution involves the repeated 'selection and succession' of rare variant cells that acquire a growth advantage over the remaining cell population through the acquisition of 'driver mutations' enabling a selective advantage in a particular micro-environment. Clonal selection is the driving force behind tumorigenesis and possesses three basic requirements: (i) effective competitive proliferation of the variant clone when compared with its neighboring cells, (ii) acquisition of an indefinite capacity for self-renewal, and (iii) establishment of sufficiently high levels of genetic and epigenetic variability to permit the emergence of rare variants. However, several questions regarding the process of clonal evolution remain. Which cellular processes initiate carcinogenesis in the first place? To what extent are environmental carcinogens responsible for the initiation of clonal evolution? What are the roles of genotoxic and non-genotoxic carcinogens in carcinogenesis? What are the underlying mechanisms responsible for chemical carcinogen-induced cellular immortality? Here, we explore the possible mechanisms of cellular immortalization, the contribution of immortalization to tumorigenesis and the mechanisms by which chemical carcinogens may contribute to these processes.
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Affiliation(s)
- Amancio Carnero
- *To whom correspondence should be addressed. Tel: +34955923111; Fax: +34955923101;
| | - Carmen Blanco-Aparicio
- Spanish National Cancer Research Center, Experimental Therapuetics Department, Melchor Fernandez Almagro, 3, 28029 Madrid, Spain
| | - Hiroshi Kondoh
- Department of Geriatric Medicine, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku Kyoto 606-8507, Japan
| | - Matilde E. Lleonart
- Institut De Recerca Hospital Vall D’Hebron, Passeig Vall d’Hebron, 119–129, 08035 Barcelona, Spain
| | | | - Chiara Mondello
- Istituto di Genetica Molecolare, CNR, Via Abbiategrasso 207, 27100 Pavia, Italy
| | - A. Ivana Scovassi
- Istituto di Genetica Molecolare, CNR, Via Abbiategrasso 207, 27100 Pavia, Italy
| | - William H. Bisson
- Environmental and Molecular Toxicology, Environmental Health Science Center, Oregon State University, Corvallis, OR 97331, USA
| | - Amedeo Amedei
- Department of Experimental and Clinical Medicine, University of Firenze, Italy, Florence 50134, Italy
| | - Rabindra Roy
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jordan Woodrick
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Annamaria Colacci
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, Bologna 40126, Italy
| | - Monica Vaccari
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, Bologna 40126, Italy
| | - Jayadev Raju
- Toxicology Research Division, Bureau of Chemical Safety Food Directorate, Health Products and Food Branch Health Canada, Ottawa, Ontario K1A0K9, Canada
| | - Fahd Al-Mulla
- Department of Pathology, Kuwait University, Safat 13110, Kuwait
| | | | - Hosni K. Salem
- Urology Department, kasr Al-Ainy School of Medicine, Cairo University, El Manial, Cairo 12515, Egypt
| | - Lorenzo Memeo
- Mediterranean Institute of Oncology, Viagrande 95029, Italy
| | - Stefano Forte
- Mediterranean Institute of Oncology, Viagrande 95029, Italy
| | - Neetu Singh
- Centre for Advanced Research, King George’s Medical University, Chowk, Lucknow, Uttar Pradesh 226003, India
| | - Roslida A. Hamid
- Department of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor 43400, Malaysia
| | - Elizabeth P. Ryan
- Department of Environmental and Radiological Health Sciences, Colorado State University/Colorado School of Public Health, Fort Collins, CO 80523-1680, USA
| | - Dustin G. Brown
- Department of Environmental and Radiological Health Sciences, Colorado State University/Colorado School of Public Health, Fort Collins, CO 80523-1680, USA
| | - John Pierce Wise
- The Wise Laboratory of Environmental and Genetic Toxicology, Maine Center for Toxicology and Environmental Health, Department of Applied Medical Sciences, University of Southern Maine, 96 Falmouth Street, Portland, ME 04104, USA and
| | - Sandra S. Wise
- The Wise Laboratory of Environmental and Genetic Toxicology, Maine Center for Toxicology and Environmental Health, Department of Applied Medical Sciences, University of Southern Maine, 96 Falmouth Street, Portland, ME 04104, USA and
| | - Hemad Yasaei
- Brunel Institute of Cancer Genetics and Pharmacogenomics, Health and Environment Theme, Institute of Environment, Health and Societies, Brunel University London, Kingston Lane, Uxbridge, UB8 3PH, UK
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31
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Liu S, Wang X, Zhao Q, Liu S, Zhang H, Shi J, Li N, Lei X, Zhao H, Deng Z, Cao Y, Ning L, Xia G, Duan E. Senescence of human skin-derived precursors regulated by Akt-FOXO3-p27KIP1/p15INK4b signaling. Cell Mol Life Sci 2015. [DOI: doi 10.1007/s00018-015-1877-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Zhang J, Wang M, Zhang Z, Luo Z, Liu F, Liu J. Celecoxib derivative OSU-03012 inhibits the proliferation and activation of hepatic stellate cells by inducing cell senescence. Mol Med Rep 2014; 11:3021-6. [PMID: 25482718 DOI: 10.3892/mmr.2014.3048] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 11/14/2014] [Indexed: 11/05/2022] Open
Abstract
Liver fibrosis may lead to portal hypertension, liver failure or hepatocellular carcinoma, and predominantly results from the proliferation and activation of hepatic stellate cells. OSU‑03012, a non‑cyclooxygenase‑inhibiting celecoxib derivative, has been previously demonstrated to promote apoptosis in certain cell types, however, its function in hepatic fibrosis remains unclear. In the current study, the inhibitory effect of OSU‑03012 on the proliferation of the LX2 human hepatic stellate cell line was evaluated by cell counting kit‑8 assay. Reverse transcription‑quantitative polymerase chain reaction was performed in order to examine the expression of α‑smooth muscle actin and type I collagen, which are representative of LX2 cell activation. The senescence of LX2 cells was measured by senescence‑associated β‑galactosidase staining, and the cell cycle and apoptosis levels were assessed by flow cytometry. The impact of senescence‑associated signaling on protein expression was assessed by western blot analysis. OSU‑03012 was observed to inhibit cell proliferation and prevent the secretion of profibrotic factors in LX2 cells in a dose‑dependent manner. Furthermore, the results demonstrated that OSU‑03012 inhibited the proliferation and activation of LX2 via the induction of cell senescence at the G1 phase, rather than via cell apoptosis. The induction of senescence may be via the upregulation of p16, p21 and p27. In conclusion, the current study provided insight into the pharmacological mechanisms of OSU‑03012 in preventing the proliferation and activation of hepatic stellate cells through cell senescence. The current study supports the theory that OSU‑03012 is a novel agent for potential use against liver fibrosis.
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Affiliation(s)
- Jun Zhang
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
| | - Miao Wang
- Department of Gastroenterology, Shanghai East Hospital, Shanghai Tongji University School of Medicine, Shanghai 200120, P.R. China
| | - Zuowei Zhang
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
| | - Zhongguang Luo
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
| | - Fei Liu
- Department of Gastroenterology, Shanghai East Hospital, Shanghai Tongji University School of Medicine, Shanghai 200120, P.R. China
| | - Jie Liu
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
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Siddharth S, Mohapatra P, Preet R, Das D, Satapathy SR, Choudhuri T, Kundu CN. Induction of apoptosis by 4-(3-(tert-butylamino)imidazo[1,2-α]pyridine-2-yl) benzoic acid in breast cancer cells via upregulation of PTEN. Oncol Res 2014; 21:1-13. [PMID: 24330847 DOI: 10.3727/096504013x13786659070190] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
We have previously reported that 4-(3-(tert-butylamino)imidazo[1,2-α]pyridine-2-yl)benzoic acid, a bicyclic N-fused aminoimidazoles derivative (BNFA-D), possesses anticancer potentiality against breast and kidney cancer cells with minimal toxicities to corresponding normal cells. Here, we explored the mechanism of action of BNFA-D in breast cancer cells using multiple cell-based assays such as MTT, DAPI, FACS, Western blot, and immunoprecipitation. BNFA-D caused apoptosis by upregulating PTEN leading to inhibition of Wnt/TCF signaling cascade and arresting S phase in breast cancer cells. Expression levels of β-catenin, cyclin D1, C-MYC, and phospho-AKT (Ser(473)) decreased with simultaneous increase in the levels of GSK3β, CK1, and PTEN in BNFA-D-treated MCF-7 cells. Interestingly, silencing of PTEN in breast cancer cells reversed the phenomenon of Wnt/TCF signaling cascade inhibition after BNFA-D treatment.
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Affiliation(s)
- Sumit Siddharth
- Cancer Biology Division, KIIT School of Biotechnology, KIIT University, Bhubaneswar, Odisha, India
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Patel A, Burton DGA, Halvorsen K, Balkan W, Reiner T, Perez-Stable C, Cohen A, Munoz A, Giribaldi MG, Singh S, Robbins DJ, Nguyen DM, Rai P. MutT Homolog 1 (MTH1) maintains multiple KRAS-driven pro-malignant pathways. Oncogene 2014; 34:2586-96. [PMID: 25023700 PMCID: PMC4294948 DOI: 10.1038/onc.2014.195] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 05/16/2014] [Accepted: 05/28/2014] [Indexed: 12/19/2022]
Abstract
Oncogenic RAS promotes production of reactive oxygen species (ROS), which mediate pro-malignant signaling but can also trigger DNA damage-induced tumor suppression. Thus RAS-driven tumor cells require redox-protective mechanisms to mitigate the damaging aspects of ROS. Here, we show that MutT Homolog 1 (MTH1), the mammalian 8-oxodGTPase that sanitizes oxidative damage in the nucleotide pool, is important for maintaining several KRAS-driven pro-malignant traits in a nonsmall cell lung carcinoma (NSCLC) model. MTH1 suppression in KRAS-mutant NSCLC cells impairs proliferation and xenograft tumor formation. Furthermore, MTH1 levels modulate KRAS-induced transformation of immortalized lung epithelial cells. MTH1 expression is upregulated by oncogenic KRAS and correlates positively with high KRAS levels in NSCLC human tumors. At a molecular level, in p53-competent KRAS-mutant cells, MTH1 loss provokes DNA damage and induction of oncogene-induced senescence. In p53-nonfunctional KRAS-mutant cells, MTH1 suppression does not produce DNA damage but reduces proliferation and leads to an adaptive decrease in KRAS expression levels. Thus, MTH1 not only enables evasion of oxidative DNA damage and its consequences, but can also function as a molecular rheostat for maintaining oncogene expression at optimal levels. Accordingly, our results indicate MTH1 is a novel and critical component of oncogenic KRAS-associated malignancy and its inhibition is likely to yield significant tumor-suppressive outcomes in KRAS-driven tumors.
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Affiliation(s)
- A Patel
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - D G A Burton
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - K Halvorsen
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - W Balkan
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - T Reiner
- Geriatric Research, Education and Clinical Center, Bruce W. Carter Veterans Affairs Medical Center, Miami, FL, USA
| | - C Perez-Stable
- 1] Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA [2] Geriatric Research, Education and Clinical Center, Bruce W. Carter Veterans Affairs Medical Center, Miami, FL, USA [3] Sylvester Comprehensive Cancer Center, University of Miami Leonard M. Miller School of Medicine, FL, USA
| | - A Cohen
- 1] Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA [2] David and Sheila Fuente Graduate Program in Cancer Biology, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - A Munoz
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - M G Giribaldi
- Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - S Singh
- Department of Surgery, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - D J Robbins
- 1] Sylvester Comprehensive Cancer Center, University of Miami Leonard M. Miller School of Medicine, FL, USA [2] Department of Surgery, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - D M Nguyen
- 1] Sylvester Comprehensive Cancer Center, University of Miami Leonard M. Miller School of Medicine, FL, USA [2] Department of Surgery, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | - P Rai
- 1] Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA [2] Sylvester Comprehensive Cancer Center, University of Miami Leonard M. Miller School of Medicine, FL, USA
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35
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Lan A, Du J. Potential role of Akt signaling in chronic kidney disease. Nephrol Dial Transplant 2014; 30:385-94. [PMID: 24891436 DOI: 10.1093/ndt/gfu196] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Renal fibrosis, particularly tubulointerstitial fibrosis, is the common final outcome of almost all chronic kidney diseases. However, the mechanisms involved in the development of renal fibrosis are poorly understood. The Akt (also known as protein kinase B, PKB) family is serine/threonine protein kinases that play critical roles in regulating growth, proliferation, survival, metabolism and other cellular activities. Cytokines, high-glucose medium, transforming growth factor-β1 or advanced glycation end-products activate Akt in different renal cells. Increased Akt activation has been found in experimental tubulointerstitial fibrosis. In addition, Akt activation is also an important node in diverse signaling cascades involved in kidney damage. These data give evidence for a role for Akt in renal fibrosis, but no reviews are available on the role of Akt in the process. Thus, our aim is to review the role of Akt activation and signaling in renal fibrosis.
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Affiliation(s)
- Aiping Lan
- The Key Laboratory of Remodeling-related Cardiovascular Diseases, Ministry of Education, Beijing An Zhen Hospital, Institute of Heart Lung and Blood Vessel Diseases, Capital Medical University, Beijing 100029, China
| | - Jie Du
- The Key Laboratory of Remodeling-related Cardiovascular Diseases, Ministry of Education, Beijing An Zhen Hospital, Institute of Heart Lung and Blood Vessel Diseases, Capital Medical University, Beijing 100029, China
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36
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Myatt SS, Kongsema M, Man CWY, Kelly DJ, Gomes AR, Khongkow P, Karunarathna U, Zona S, Langer JK, Dunsby CW, Coombes RC, French PM, Brosens JJ, Lam EWF. SUMOylation inhibits FOXM1 activity and delays mitotic transition. Oncogene 2013; 33:4316-29. [PMID: 24362530 PMCID: PMC4096495 DOI: 10.1038/onc.2013.546] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 10/16/2013] [Accepted: 11/18/2013] [Indexed: 12/22/2022]
Abstract
The forkhead box transcription factor FOXM1 is an essential effector of G2/M-phase transition, mitosis and the DNA damage response. As such, it is frequently deregulated during tumorigenesis. Here we report that FOXM1 is dynamically modified by SUMO1 but not by SUMO2/3 at multiple sites. We show that FOXM1 SUMOylation is enhanced in MCF-7 breast cancer cells in response to treatment with epirubicin and mitotic inhibitors. Mutation of five consensus conjugation motifs yielded a SUMOylation-deficient mutant FOXM1. Conversely, fusion of the E2 ligase Ubc9 to FOXM1 generated an auto-SUMOylating mutant (FOXM1-Ubc9). Analysis of wild-type FOXM1 and mutants revealed that SUMOylation inhibits FOXM1 activity, promotes translocation to the cytoplasm and enhances APC/Cdh1-mediated ubiquitination and degradation. Further, expression of the SUMOylation-deficient mutant enhanced cell proliferation compared with wild-type FOXM1, whereas the FOXM1-Ubc9 fusion protein resulted in persistent cyclin B1 expression and slowed the time from mitotic entry to exit. In summary, our findings suggest that SUMOylation attenuates FOXM1 activity and causes mitotic delay in cytotoxic drug response.
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Affiliation(s)
- S S Myatt
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - M Kongsema
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - C W-Y Man
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, SAR China
| | - D J Kelly
- 1] Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK [2] Photonics Group, Department of Physics, Imperial College London, London, UK
| | - A R Gomes
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - P Khongkow
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - U Karunarathna
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - S Zona
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - J K Langer
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - C W Dunsby
- Photonics Group, Department of Physics, Imperial College London, London, UK
| | - R C Coombes
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
| | - P M French
- Photonics Group, Department of Physics, Imperial College London, London, UK
| | - J J Brosens
- Division of Reproductive Health, Warwick Medical School, Clinical Sciences Research Laboratories, University Hospital, Coventry, UK
| | - E W-F Lam
- Department of Surgery and Cancer, Imperial College London, Imperial Centre for Translational and Experimental Medicine (ICTEM), London, UK
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37
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Zeng N, Yang KT, Bayan JA, He L, Aggarwal R, Stiles JW, Hou X, Medina V, Abad D, Palian BM, Al-Abdullah I, Kandeel F, Johnson DL, Stiles BL. PTEN controls β-cell regeneration in aged mice by regulating cell cycle inhibitor p16ink4a. Aging Cell 2013; 12:1000-11. [PMID: 23826727 DOI: 10.1111/acel.12132] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2013] [Indexed: 12/31/2022] Open
Abstract
Tissue regeneration diminishes with age, concurrent with declining hormone levels including growth factors such as insulin-like growth factor-1 (IGF-1). We investigated the molecular basis for such decline in pancreatic β-cells where loss of proliferation occurs early in age and is proposed to contribute to the pathogenesis of diabetes. We studied the regeneration capacity of β-cells in mouse model where PI3K/AKT pathway downstream of insulin/IGF-1 signaling is upregulated by genetic deletion of Pten (phosphatase and tensin homologue deleted on chromosome 10) specifically in insulin-producing cells. In this model, PTEN loss prevents the decline in proliferation capacity in aged β-cells and restores the ability of aged β-cells to respond to injury-induced regeneration. Using several animal and cell models where we can manipulate PTEN expression, we found that PTEN blocks cell cycle re-entry through a novel pathway leading to an increase in p16(ink4a), a cell cycle inhibitor characterized for its role in cellular senescence/aging. A downregulation in p16(ink4a) occurs when PTEN is lost as a result of cyclin D1 induction and the activation of E2F transcription factors. The activation of E2F transcriptional factors leads to methylation of p16(ink4a) promoter, an event that is mediated by the upregulation of polycomb protein, Ezh2. These analyses establish a novel PTEN/cyclin D1/E2F/Ezh2/p16(ink4a) signaling network responsible for the aging process and provide specific evidence for a molecular paradigm that explain how decline in growth factor signals such as IGF-1 (through PTEN/PI3K signaling) may control regeneration and the lack thereof in aging cells.
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Affiliation(s)
- Ni Zeng
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Kai-Ting Yang
- Department of Biochemistry; Keck School of Medicine; University of Southern California; Los Angeles CA 90033 USA
| | - Jennifer-Ann Bayan
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Lina He
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Richa Aggarwal
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Joseph W. Stiles
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Xiaogang Hou
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Vivian Medina
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Danny Abad
- Islet Transplant Center; City of Hope; Duarte CA 91010 USA
| | - Beth M. Palian
- Department of Biochemistry; Keck School of Medicine; University of Southern California; Los Angeles CA 90033 USA
| | | | - Fouad Kandeel
- Islet Transplant Center; City of Hope; Duarte CA 91010 USA
| | - Deborah L. Johnson
- Department of Biochemistry; Keck School of Medicine; University of Southern California; Los Angeles CA 90033 USA
| | - Bangyan L. Stiles
- Pharmacology and Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
- Department of Pathology; Keck School of Medicine; University of Southern California; Los Angeles CA 90033 USA
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38
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Marques L, Thorsteinsdóttir S. Dynamics of Akt activation during mouse embryo development: distinct subcellular patterns distinguish proliferating versus differentiating cells. Differentiation 2013; 86:48-56. [PMID: 23968884 DOI: 10.1016/j.diff.2013.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 06/21/2013] [Accepted: 07/03/2013] [Indexed: 12/19/2022]
Abstract
Akt is a highly conserved serine-threonine protein kinase which has been implicated in a wide variety of cellular functions, from the regulation of growth and metabolism, to activation of pro-survival pathways and cell proliferation, and promotion of differentiation in specific cell types. However, very little is known about the spatial and temporal pattern of Akt activity within cells and whether this pattern changes as cells enter and proceed in their differentiation programs. To address this issue we profiled Akt activation in E8.5-E13.5 mouse embryos and in C2C12 cells. We used a commercial antibody against Akt, phosphorylated on one of its activating residues, Thr-308, and performed high resolution confocal imaging of the immunofluorescence in labeled embryos. We observe strong Akt activity during mitosis in the dermomyotome, the neuroepithelium and some mesenchymal cells. This burst of activity fills the whole cell except for heterochromatin-positive areas in the nucleus. A surge in activity during mitosis is also observed in subconfluent C2C12 cells. Later on in the differentiation programs of skeletal muscle and neural cells, derivatives of the dermomyotome and neuroepithelium, respectively, we find robust, sustained Akt activity in the cytoplasm, but not in the nucleus. Concomitantly with skeletal muscle differentiation, Akt activity becomes concentrated in the sarcomeric Z-disks whereas developing neurons maintain a uniform cytoplasmic pattern of activated Akt. Our findings reveal unprecedented cellular and subcellular details of Akt activity during mouse embryo development, which is spatially and temporally consistent with proposed functions for Akt in mitosis and myogenic and neural differentiation and/or survival. Our results thus demonstrate a subcellular change in the pattern of Akt activation when skeletal muscle and neural progenitor cells cease dividing and progress in their differentiation programs.
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Affiliation(s)
- Luís Marques
- Centro de Biologia Ambiental/Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; Instituto Gulbenkian de Ciência, Oeiras, Portugal.
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39
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Kim SM, Park JH, Kim KD, Nam D, Shim BS, Kim SH, Ahn KS, Choi SH, Ahn KS. Brassinin induces apoptosis in PC-3 human prostate cancer cells through the suppression of PI3K/Akt/mTOR/S6K1 signaling cascades. Phytother Res 2013; 28:423-31. [PMID: 23686889 DOI: 10.1002/ptr.5010] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 03/18/2013] [Accepted: 04/10/2013] [Indexed: 01/08/2023]
Abstract
The oncogenic PI3K/Akt/mammalian target of rapamycin (mTOR) signaling axis and its downstream effector, the ribosomal protein S6 kinase 1 (S6K1) play a key role in mediating cell survival in various tumor cells. Here, we investigated the effects of brassinin (BSN), a phytoalexin first identified as a constituent of cabbage, on the PI3K/Akt/mTOR/S6K1 activation, cellular proliferation, and apoptosis in PC-3 human prostate cancer. BSN exerted a significant dose-dependent cytotoxicity and reduced constitutive phosphorylation of Akt against androgen-independent PC-3 cells as compared to androgen-dependent LNCaP cells. Moreover, knockdown of androgen receptor (AR) by small interfering RNA enhanced the potential effect of BSN on induction of apoptosis in LNCaP cells. BSN clearly suppressed the constitutive activation of PI3K/Akt/mTOR/S6K1 signaling cascade, which correlated with the induction of apoptosis as characterized by accumulation of cells in subG1 phase, positive Annexin V binding, TUNEL staining, loss of mitochondrial membrane potential, down-regulation of antiapoptotic and proliferative proteins, activation of caspase-3, and cleavage of PARP. Additionally, BSN could block broad-spectrum inhibition of PI3K/Akt/mTOR/S6K1 axes, and aberrant Akt activation by pcDNA3-myr-HA-Akt1 plasmid could not prevent the observed suppressive effect of BSN on constitutive mTOR activation. Finally, overexpression of Bcl-2 also attenuated BSN-mediated apoptosis in PC-3 cells. Taken together, our findings suggest that BSN can interfere with multiple signaling cascades involved in tumorigenesis and might be provided as a potential therapeutic candidate for both the prevention and treatment of prostate cancer.
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Affiliation(s)
- Sung-Moo Kim
- College of Korean Medicine, Kyung Hee University, 1 Hoegi-Dong Dongdaemun-Gu, Seoul, 130-701, Republic of Korea
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Brosens JJ, Lam EWF. Progesterone and FOXO1 signaling: harnessing cellular senescence for the treatment of ovarian cancer. Cell Cycle 2013; 12:1660-1. [PMID: 23708447 PMCID: PMC3713121 DOI: 10.4161/cc.25070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Affiliation(s)
- Jan J Brosens
- Division of Reproductive Health, Clinical Sciences Research Laboratories, University Hospital, Warwick Medical School, Coventry, UK.
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Müller R, Fischer C, Wilmes T, Heimrich B, Distel V, Klugbauer N, Meyer DK. Phosphoinositide-3-kinases p110α and p110β mediate S phase entry in astroglial cells in the marginal zone of rat neocortex. Front Cell Neurosci 2013; 7:24. [PMID: 23504389 PMCID: PMC3596864 DOI: 10.3389/fncel.2013.00024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 02/25/2013] [Indexed: 11/13/2022] Open
Abstract
In cells cultured from neocortex of newborn rats, phosphoinositide-3-kinases of class I regulate the DNA synthesis in a subgroup of astroglial cells. We have studied the location of these cells as well as the kinase isoforms which facilitate the S phase entry. Using dominant negative (dn) isoforms as well as selective pharmacological inhibitors we quantified S phase entry by nuclear labeling with bromodeoxyuridine (BrdU). Only in astroglial cells harvested from the marginal zone (MZ) of the neocortex inhibition of phosphoinositide-3-kinases reduced the nuclear labeling with BrdU, indicating that neocortical astroglial cells differ in the regulation of proliferation. The two kinase isoforms p110α and p110β were essential for S phase entry. p110α diminished the level of the p27Kip1 which inactivates the complex of cyclin E and CDK2 necessary for entry into the S phase. p110β phosphorylated and inhibited glycogen synthase kinase-3β which can prevent S-phase entry. Taken together, both isoforms mediated S phase in a subgroup of neocortical astroglial cells and acted via distinct pathways.
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Affiliation(s)
- Rabea Müller
- Institute of Experimental and Clinical Pharmacology und Toxicology, Albert-Ludwigs-University Freiburg Freiburg, Germany
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Kim SW, Kim SM, Bae H, Nam D, Lee JH, Lee SG, Shim BS, Kim SH, Ahn KS, Choi SH, Sethi G, Ahn KS. Embelin inhibits growth and induces apoptosis through the suppression of Akt/mTOR/S6K1 signaling cascades. Prostate 2013; 73:296-305. [PMID: 22887478 DOI: 10.1002/pros.22574] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Accepted: 07/05/2012] [Indexed: 12/16/2022]
Abstract
BACKGROUND Akt/mTOR/S6K1 signaling cascades play an important role both in the survival and proliferation of tumor cells. METHODS In the present study, we investigated the effects of embelin (EB), identified primarily from the Embelia ribes plant, on the Akt/mTOR/S6K1 activation, associated gene products, cellular proliferation, and apoptosis in human prostate cancer cells. RESULTS EB exerted significant cytotoxic and suppressive effects on Akt and mTOR activation against androgen-independent PC-3 cells as compared to androgen-dependent LNCaP cells. Moreover, EB suppressed the constitutive activation of Akt/mTOR/S6K1 signaling cascade, which correlated with the induction of apoptosis as characterized by accumulation of cells in subG1 phase, positive Annexin V binding, down-regulation of anti-apoptotic (Bcl-2, Bcl-xL, survivin, IAP-1, and IAP-2) and proliferative (cyclin D1) proteins, activation of caspase-3, and cleavage of PARP. We also observed that EB can significantly enhance the apoptotic effects of a specific pharmacological Akt inhibitor when used in combination and also caused broad inhibition of all the three kinases in Akt/mTOR/S6K1 signaling axis in PC-3 cells. CONCLUSIONS EB inhibits multiple signaling cascades involved in tumorigenesis and can be used as a potential therapeutic candidate for both the prevention and treatment of prostate cancer.
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Affiliation(s)
- Seong Won Kim
- College of Oriental Medicine and Institute of Oriental Medicine, Kyung Hee University, Seoul, Republic of Korea
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Pericacho M, Velasco S, Prieto M, Llano E, López-Novoa JM, Rodríguez-Barbero A. Endoglin haploinsufficiency promotes fibroblast accumulation during wound healing through Akt activation. PLoS One 2013; 8:e54687. [PMID: 23349951 PMCID: PMC3547945 DOI: 10.1371/journal.pone.0054687] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Accepted: 12/17/2012] [Indexed: 01/03/2023] Open
Abstract
Accurate regulation of dermal fibroblast function plays a crucial role in wound healing. Many fibrotic diseases are characterized by a failure to conclude normal tissue repair and the persistence of fibroblasts inside lesions. In the present study we demonstrate that endoglin haploinsufficiency promotes fibroblast accumulation during wound healing. Moreover, scars from endoglin-heterozygous (Eng+/−) mice show persisting fibroblasts 12 days after wounding, which could lead to a fibrotic scar. Endoglin haploinsufficiency results in increased proliferation and migration of primary cultured murine dermal fibroblasts (MDFs). Moreover, Eng+/− MDF have diminished responses to apoptotic signals compared with control cells. Altogether, these modifications could explain the augmented presence of fibroblasts in Eng+/− mice wounds. We demonstrate that endoglin expression regulates Akt phosphorylation and that PI3K inhibition abolishes the differences in proliferation between endoglin haploinsufficient and control cells. Finally, persistent fibroblasts in Eng+/− mice wound co-localize with a greater degree of Akt phosphorylation. Thus, endoglin haploinsufficiency seems to promote fibroblast accumulation during wound healing through the activation of the PI3K/Akt pathway. These studies open new non-Smad signaling pathway for endoglin regulating fibroblast cell function during wound healing, as new therapeutic opportunities for the treatment of fibrotic wounds.
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Affiliation(s)
- Miguel Pericacho
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
| | - Soraya Velasco
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
| | - Marta Prieto
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
| | - Elena Llano
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
| | - José M. López-Novoa
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
- Biomedical Research Institute of Salamanca, Salamanca, Spain
| | - Alicia Rodríguez-Barbero
- Renal and Cardiovascular Physiopathology Unit, Instituto “Reina Sofía” de Investigación Nefrológica, Departamento de Fisiología y Farmacología, Universidad de Salamanca, Salamanca, Spain
- Biomedical Research Institute of Salamanca, Salamanca, Spain
- * E-mail:
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Troiani T, Martinelli E, Morgillo F, Capasso A, Nappi A, Sforza V, Ciardiello F. Targeted approach to metastatic colorectal cancer: what comes beyond epidermal growth factor receptor antibodies and bevacizumab? Ther Adv Med Oncol 2013; 5:51-72. [PMID: 23323147 PMCID: PMC3539274 DOI: 10.1177/1758834012462462] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The prognosis of patients with cancer remains poor in spite of the advances obtained in recent years with new therapeutic agents, new approaches in surgical procedures and new diagnostic methods. The discovery of a plethora of cellular targets and the rational generation of selective targeting agents has opened an era of new opportunities and extraordinary challenges. The specificity of these agents renders them capable of specifically targeting the inherent abnormalities of cancer cells, potentially resulting in less toxicity than traditional nonselective cytotoxics. Among the many new types of rationally designed agents are therapeutics targeting various strategic facets of growth signal transduction, malignant angiogenesis, survival, metastasis and cell-cycle regulation. The evaluation of these agents is likely to require some changes from the traditional drug development paradigms to realize their full potential. Inhibition of the epidermal growth factor receptor and the vascular endothelial growth factor have provided proof of principle that disruption of signal cascades in patients with colorectal cancer has therapeutic potential. This experience has also taught us that resistance to such rationally developed targeted therapeutic strategies is common. In this article, we review the role of signal transduction in colorectal cancer, introduce promising molecular targets, and outline therapeutic approaches under development.
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Affiliation(s)
- Teresa Troiani
- Oncologia Medica and Immunologia Clinica, Dipartimento Medico-Chirurgico di Internistica Clinica e Sperimentale F. Magrassi e A. Lanzara, Seconda Università degli Studi di Napoli, Napoli, Italy
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Ling H, Samarasinghe S, Kulasiri D. Computational experiments reveal the efficacy of targeting CDK2 and CKIs for significantly lowering cellular senescence bar for potential cancer treatment. Biosystems 2012; 111:71-82. [PMID: 23254306 DOI: 10.1016/j.biosystems.2012.12.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 11/29/2012] [Accepted: 12/06/2012] [Indexed: 01/19/2023]
Abstract
Lowering the threshold of cellular senescence, the process employed by cells to thwart abnormal cell proliferation, though inhibition of CDK2 or Skp2 (regulator of CDK inhibitors) has been recently suggested as a potential avenue for cancer treatment. In this study, we employ a published mathematical model of G1/S transition involving the DNA-damage signal transduction pathway to conduct carefully constructed computational experiments to highlight the effectiveness of manipulating cellular senescence in inhibiting damaged cell proliferation. We first demonstrate the suitability of the mathematical model to explore senescence by highlighting the overlap between senescence pathways and those involved in G1/S transition and DNA damage signal transduction. We then investigate the effect of CDK2 deficiency on senescence in healthy cells, followed by effectiveness of CDK2 deficiency in triggering senescence in DNA damaged cells. For this, we focus on the behaviour of CycE, whose peak response indicates G1/S transition, for several reduced CDK2 levels in healthy as well as two DNA-damage conditions to calculate the probability (β) or the percentage of CDK2 deficient cells passing G1/S checkpoint ((1-β) indicates level of senescence). Results show that 50% CDK2 deficiency can cause senescence in all healthy cells in a fairly uniform cell population; whereas, most healthy cells (≈67%) in a heterogeneous population escape senescence. This finding is novel to our study. Under both low- and high-DNA damaged conditions, 50% CDK deficiency can cause 65% increase in senescence in a heterogeneous cell population. Furthermore, the model analyses the relationship between CDK2 and its CKIs (p21, p27) to help search for other effective ways to bring forward cellular senescence. Results show that the degradation rate of p21 and initial concentration of p27 are effective in lowering CDK2 levels to lower the senescence threshold. Specifically, CDK2 and p27 are the most effective in triggering senescence while p21 having a smaller influence. While receiving experimental support, these findings specify in detail the inhibitory effects of CKIs. However, simultaneous variation of CDK2 and CKIs produces a dramatic reduction of damage cells passing the G1/S with CDK2&p27 combination causing senescence in almost all damaged cells. This combined effect of CDK2&CKIs on senescence is a novel contribution in this study. A review of the crucial protein complexes revealed that the concentration of active CycE/CDK2-p that controls cell cycle arrest provides support for the above findings with CycE/CDK2-p undergoing the largest reduction (over 100%) under the combined CDK2&CKI conditions leading to the arrest of most of the damaged cells. Our study thus provides quantitative assessments for the previously published qualitative findings on senescence and highlights new avenues for bringing forward senescence bar.
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Affiliation(s)
- Hong Ling
- Centre for Advanced Computational Solutions (C-fACS), Molecular Biosciences Department, Lincoln University, Christchurch, New Zealand.
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Li J, Yu L, Zhao Y, Fu G, Zhou B. Thymosin β4 reduces senescence of endothelial progenitor cells via the PI3K/Akt/eNOS signal transduction pathway. Mol Med Rep 2012; 7:598-602. [PMID: 23151623 DOI: 10.3892/mmr.2012.1180] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Accepted: 10/30/2012] [Indexed: 11/06/2022] Open
Abstract
We previously demonstrated that thymosin β4 (Tβ4) regulates a variety of endothelial progenitor cell (EPC) functions, including cell migration, proliferation, survival and angiogenesis. However, the effect of Tβ4 on the senescence of circulating EPCs remains unclear. In the present study, the effect of Tβ4 on EPC senescence and the signal transduction pathways involved in this process was investigated. Circulating EPCs isolated from healthy volunteers were cultured in the absence or presence of Tβ4 and various signal cascade inhibitors. Tβ4 inhibited EPC senescence in a concentration‑dependent manner. In addition, Tβ4 increased telomerase activity and expression of telomerase reverse transcriptase mRNA in EPCs. Tβ4 also regulated the expression of p21, p27 and cyclin D1. The effects of Tβ4 on EPC senescence were eliminated by the phosphoinositide 3'‑kinase (PI3K) inhibitor, wortmannin and the endothelial nitric oxide synthase inhibitor, L‑nitroarginine methyl ester hydrochloride (L‑NAME). In conclusion, the inhibitory effect on EPC senescence mediated by Tβ4 may be attributed, at least in part, to activation of the PI3K‑Akt‑eNOS signaling pathway.
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Affiliation(s)
- Juan Li
- Department of Cardiology, Biomedical Research (Therapy) Center, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, Zhejiang, P.R. China
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Sarangi U, Paithankar KR, Kumar JU, Subramaniam V, Sreedhar AS. 17AAG Treatment Accelerates Doxorubicin Induced Cellular Senescence: Hsp90 Interferes with Enforced Senescence of Tumor Cells. Drug Target Insights 2012; 6:19-39. [PMID: 22915839 PMCID: PMC3422084 DOI: 10.4137/dti.s9943] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Hsp90 chaperone has been identified as an attractive pharmacological target to combat cancer. However, some metastatic tumors either fail to respond to Hsp90 inhibition or show recovery necessitating irreversible therapeutic strategies. In response to this enforced senescence has been proposed as an alternate strategy. Here, we demonstrate that inhibiting Hsp90 with 17AAG sensitizes human neuroblastoma to DNA damage response mediated cellular senescence. Among individual and combination drug treatments, 17AAG pre-treatment followed by doxorubicin treatment exhibited senescence-like characteristics such as increased nucleus to cytoplasm ratio, cell cycle arrest, SA-β-gal staining and the perpetual increase in SAHF. Doxorubicin induced senescence signaling was mediated by p53-p21(CIP/WAF-1) and was accelerated in the absence of functional Hsp90. Sustained p16(INK4a) and H3K4me3 expressions correlating with unaffected telomerase activation annulled replicative senescence and appraised stress induced senescence. Despite increases in [(ROS)i] and [(Ca(2+))i], a concomitant increase in cellular antioxidant defense system suggested oxidation independent senescence activation. Sustained activation of survival (Akt) and proliferative (ERK1/2) kinases fosters robustness of cells. Invigorating senescent cells with growth factor or snooping with mTOR or PI3 kinase inhibitors compromised cell survival but not senescence. Intriguingly, senescence-associated secretory factors from the senescence cells manifested established senescence in neuroblastoma, which offers clinical advantage to our approach. Our study discusses tumor selective functions of Hsp90 and discusses irrefutable strategies of Hsp90 inhibition in anticancer treatments.
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Affiliation(s)
- Upasana Sarangi
- CSIR Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India
| | - Khande Rao Paithankar
- CSIR Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India
| | - Jonnala Ujwal Kumar
- CSIR Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India
| | - Vaidyanathan Subramaniam
- CSIR Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India
| | - Amere Subbarao Sreedhar
- CSIR Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India
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Mechanical stretch and PI3K signaling link cell migration and proliferation to coordinate epithelial tubule morphogenesis in the zebrafish pronephros. PLoS One 2012; 7:e39992. [PMID: 22815719 PMCID: PMC3399848 DOI: 10.1371/journal.pone.0039992] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 06/05/2012] [Indexed: 12/31/2022] Open
Abstract
Organ development leads to the emergence of organ function, which in turn can impact developmental processes. Here we show that fluid flow-induced collective epithelial migration during kidney nephron morphogenesis induces cell stretch that in turn signals epithelial proliferation. Increased cell proliferation was dependent on PI3K signaling. Inhibiting epithelial proliferation by blocking PI3K or CDK4/Cyclin D1 activity arrested cell migration prematurely and caused a marked overstretching of the distal nephron tubule. Computational modeling of the involved cell processes predicted major morphological and kinetic outcomes observed experimentally under a variety of conditions. Overall, our findings suggest that kidney development is a recursive process where emerging organ function "feeds back" to the developmental program to influence fundamental cellular events such as cell migration and proliferation, thus defining final organ morphology.
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Choi KM, Lee YS, Sin DM, Lee S, Lee MK, Lee YM, Hong JT, Yun YP, Yoo HS. Sulforaphane inhibits mitotic clonal expansion during adipogenesis through cell cycle arrest. Obesity (Silver Spring) 2012; 20:1365-71. [PMID: 22282047 DOI: 10.1038/oby.2011.388] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Obesity is a risk factor for numerous metabolic disorders such as type 2 diabetes, hypertension, and coronary heart disease. Adipocyte differentiation is triggered by adipocyte hyperplasia, which leads to obesity. In this study, the inhibitory effect of sulforaphane, an isothiocyanate, on adipogenesis in 3T3-L1 cells was investigated. Sulforaphane decreased the accumulation of lipid droplets stained with Oil Red O and inhibited the elevation of triglycerides in the adipocytes (half-maximal inhibitory concentration = 7.3 µmol/l). The expression of peroxisome proliferator-activated receptor γ (PPARγ) and CCAAT/enhancer-binding protein α (C/EBPα), major transcription factors for adipocyte differentiation, was significantly reduced by sulforaphane. The major effects of sulforaphane on the inhibition of adipocyte differentiation occurred during the early stage of adipogenesis. Thus, the expression of C/EBPβ, an early-stage biomarker of adipogenesis, decreased in a concentration-dependent manner when the adipocytes were exposed to sulforaphane (0, 5, 10, and 20 µmol/l). The proliferation of adipocytes treated with 20 µmol/l sulforaphane for 24 and 48 h was also suppressed. These results indicate that sulforaphane may specifically affect mitotic clonal expansion to inhibit adipocyte differentiation. Sulforaphane arrested the cell cycle at the G(0)/G(1) phase, increased p27 expression, and decreased retinoblastoma (Rb) phosphorylation. Additionally, sulforaphane modestly decreased the phosphorylation of ERK1/2 and Akt. Our results indicate that the inhibition of early-stage adipocyte differentiation by sulforaphane may be associated with cell cycle arrest at the G(0)/G(1) phase through upregulation of p27 expression.
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Affiliation(s)
- Kyeong-Mi Choi
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju, South Korea
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GSK3 inactivation is involved in mitochondrial complex IV defect in transforming growth factor (TGF) β1-induced senescence. Exp Cell Res 2012; 318:1808-19. [PMID: 22652454 DOI: 10.1016/j.yexcr.2012.04.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Revised: 04/23/2012] [Accepted: 04/24/2012] [Indexed: 01/07/2023]
Abstract
Transforming growth factor β1 (TGF β1) induces Mv1Lu cell senescence by persistently producing mitochondrial reactive oxygen species (ROS) through decreased complex IV activity. Here, we investigated the molecular mechanism underlying the effect of TGF β1 on mitochondrial complex IV activity. TGF β1 progressively phosphorylated the negative regulatory sites of both glycogen synthase kinase 3 (GSK3) α and β, corresponding well to the intracellular ROS generation profile. Pre-treatment of N-acetyl cysteine, an antioxidant, did not alter this GSK3 phosphorylation (inactivation), whereas pharmacological inhibition of GSK3 by SB415286 significantly increased mitochondrial ROS, implying that GSK3 phosphorylation is an upstream event of the ROS generation. GSK3 inhibition by SB415286 decreased complex IV activity and cellular O(2) consumption rate and eventually induced senescence of Mv1Lu cell. Similar results were obtained with siRNA-mediated knockdown of GSK3. Moreover, we found that GSK3 not only exists in cytosol but also in mitochondria of Mv1Lu cell and the mitochondrial GSK3 binds complex IV subunit 6b which has no electron carrier and is topologically located in the mitochondrial intermembrane space. Involvement of subunit 6b in controlling complex IV activity and overall respiration rate was proved with siRNA-mediated knockdown of subunit 6b. Finally, TGF β1 treatment decreased the binding of the subunit 6b to GSK3 and subunit 6b phosphorylation. Taken together, our results suggest that GSK3 inactivation is importantly involved in TGF β1-induced complex IV defects through decreasing phosphorylation of the subunit 6b, thereby contributing to senescence-associated mitochondrial ROS generation.
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