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Li Y, Abounader R. Editorial: GBM stem cells and the brain tumor microenvironment. Front Oncol 2023; 13:1153803. [PMID: 36923429 PMCID: PMC10010165 DOI: 10.3389/fonc.2023.1153803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 02/07/2023] [Indexed: 03/03/2023] Open
Affiliation(s)
- Yunqing Li
- Hugo W. Moser Research Institute at Kennedy Krieger, Baltimore, MD, United States.,Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Roger Abounader
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, VA, United States.,Department of Neurology, University of Virginia, Charlottesville, VA, United States.,University of Virginia National Cancer Institute (NCI)-Designated Comprehensive Cancer Center, Charlottesville, VA, United States
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2
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Zhao K, Schäfer A, Zhang Z, Elsässer K, Culmsee C, Zhong L, Pagenstecher A, Nimsky C, Bartsch JW. Inhibition of Carbonic Anhydrase 2 Overcomes Temozolomide Resistance in Glioblastoma Cells. Int J Mol Sci 2021; 23:157. [PMID: 35008590 PMCID: PMC8745118 DOI: 10.3390/ijms23010157] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/21/2021] [Accepted: 12/22/2021] [Indexed: 12/15/2022] Open
Abstract
About 95% of Glioblastoma (GBM) patients experience tumor relapse as a consequence of resistance to the first-line standard chemotherapy using temozolomide (TMZ). Recent studies reported consistently elevated expression levels of carbonic anhydrase CA2 in recurrent glioblastoma and temozolomide-resistant glioblastoma stem-like cells (GSCs). Here we show that CA2 is preferentially expressed in GSCs and upregulated by TMZ treatment. When expressed in GBM cell lines, CA2 exerts significant metabolic changes reflected by enhanced oxygen consumption and increased extracellular acidification causing higher rates of cell invasion. Notably, GBM cells expressing CA2 respond to combined treatment with TMZ and brinzolamide (BRZ), a non-toxic and potent CA2 inhibitor. Interestingly, brinzolamide was more effective than the pan-CA inhibitor Acetazolamide (ACZ) to sensitize naïve GSCs and TMZ-resistant GSCs to TMZ induced cell death. Mechanistically, we demonstrated that the combined treatment of GBM stem cells with TMZ and BRZ caused autophagy of GBM cell lines and GSCs, reflected by enhanced LC3 cleavage (LC3-II) and p62 reduction. Our findings illustrate the potential of CA2 as a chemo-sensitizing drug target in recurrent GBM and propose a combined treatment of TMZ with CA2 inhibitor to tackle GBM chemoresistance and recurrence.
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Affiliation(s)
- Kai Zhao
- Department of Neurosurgery, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany; (K.Z.); (A.S.); (Z.Z.); (C.N.)
| | - Agnes Schäfer
- Department of Neurosurgery, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany; (K.Z.); (A.S.); (Z.Z.); (C.N.)
| | - Zhuo Zhang
- Department of Neurosurgery, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany; (K.Z.); (A.S.); (Z.Z.); (C.N.)
| | - Katharina Elsässer
- Department of Pharmacology and Clinical Pharmacology, Biochemical-Pharmacological Center, University of Marburg, Karl-von-Frisch-Strasse 2, 35032 Marburg, Germany; (K.E.); (C.C.)
| | - Carsten Culmsee
- Department of Pharmacology and Clinical Pharmacology, Biochemical-Pharmacological Center, University of Marburg, Karl-von-Frisch-Strasse 2, 35032 Marburg, Germany; (K.E.); (C.C.)
- Center for Mind, Brain and Behavior, 35032 Marburg, Germany;
| | - Li Zhong
- College of Bioengineering, Chongqing University, Shazheng Street 174, Shapingba District, Chongqing 400044, China;
| | - Axel Pagenstecher
- Center for Mind, Brain and Behavior, 35032 Marburg, Germany;
- Department of Neuropathology, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany
| | - Christopher Nimsky
- Department of Neurosurgery, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany; (K.Z.); (A.S.); (Z.Z.); (C.N.)
- Center for Mind, Brain and Behavior, 35032 Marburg, Germany;
| | - Jörg W. Bartsch
- Department of Neurosurgery, Uniklinikum Giessen and Marburg (UKGM), University of Marburg, Baldingerstraße, 35033 Marburg, Germany; (K.Z.); (A.S.); (Z.Z.); (C.N.)
- Center for Mind, Brain and Behavior, 35032 Marburg, Germany;
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3
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Shirakawa Y, Hide T, Yamaoka M, Ito Y, Ito N, Ohta K, Shinojima N, Mukasa A, Saito H, Jono H. Ribosomal protein S6 promotes stem-like characters in glioma cells. Cancer Sci 2020; 111:2041-2051. [PMID: 32246865 PMCID: PMC7293102 DOI: 10.1111/cas.14399] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 03/18/2020] [Accepted: 03/20/2020] [Indexed: 12/11/2022] Open
Abstract
Glioblastoma multiforme (GBM), a lethal brain tumor developing in the white matter of the adult brain, contains a small population of GBM stem cells (GSCs), which potentially cause chemotherapeutic resistance and tumor recurrence. However, the mechanisms underlying the pathogenesis and maintenance of GSCs remain largely unknown. A recent study reported that incorporation of ribosomes and ribosomal proteins into somatic cells promoted lineage trans-differentiation toward multipotency. This study aimed to investigate the mechanism underlying stemness acquisition in GBM cells by focusing on 40S ribosomal protein S6 (RPS6). RPS6 was significantly upregulated in high-grade glioma and localized at perivascular, perinecrotic, and border niches in GBM tissues. siRNA-mediated RPS6 knock-down significantly suppressed the characteristics of GSCs, including their tumorsphere potential and GSC marker expression; STAT3 was downregulated in GBM cells. RPS6 overexpression enhanced the tumorsphere potential of GSCs and these effects were attenuated by STAT3 inhibitor (AG490). Moreover, RPS6 expression was significantly correlated with SOX2 expression in different glioma grades. Immunohistochemistry data herein indicated that RPS6 was predominant in GSC niches, concurrent with the data from IVY GAP databases. Furthermore, RPS6 and other ribosomal proteins were upregulated in GSC-predominant areas in this database. The present results indicate that, in GSC niches, ribosomal proteins play crucial roles in the development and maintenance of GSCs and are clinically associated with chemoradioresistance and GBM recurrence.
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Affiliation(s)
- Yuki Shirakawa
- Department of Clinical Pharmaceutical SciencesGraduate School of Pharmaceutical SciencesKumamoto UniversityKumamotoJapan
| | - Takuichiro Hide
- Department of NeurosurgeryKitasato University School of MedicineSagamiharaJapan
| | - Michiko Yamaoka
- Department of Clinical Pharmaceutical SciencesGraduate School of Pharmaceutical SciencesKumamoto UniversityKumamotoJapan
| | - Yuki Ito
- Department of Clinical Pharmaceutical SciencesGraduate School of Pharmaceutical SciencesKumamoto UniversityKumamotoJapan
| | - Naofumi Ito
- Department of Developmental NeurobiologyGraduate School of Life SciencesKumamoto UniversityKumamotoJapan
| | - Kunimasa Ohta
- Department of Developmental NeurobiologyGraduate School of Life SciencesKumamoto UniversityKumamotoJapan
| | - Naoki Shinojima
- Department of NeurosurgeryFaculty of Life SciencesKumamoto UniversityKumamotoJapan
| | - Akitake Mukasa
- Department of NeurosurgeryFaculty of Life SciencesKumamoto UniversityKumamotoJapan
| | - Hideyuki Saito
- Department of Clinical Pharmaceutical SciencesGraduate School of Pharmaceutical SciencesKumamoto UniversityKumamotoJapan
- Department of PharmacyKumamoto University HospitalKumamoto CityJapan
| | - Hirofumi Jono
- Department of Clinical Pharmaceutical SciencesGraduate School of Pharmaceutical SciencesKumamoto UniversityKumamotoJapan
- Department of PharmacyKumamoto University HospitalKumamoto CityJapan
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Xu Q, Hu C, Zhu Y, Wang K, Lal B, Li L, Tang J, Wei S, Huang G, Xia S, Lv S, Laterra J, Jiang Y, Li Y. ShRNA-based POLD2 expression knockdown sensitizes glioblastoma to DNA-Damaging therapeutics. Cancer Lett 2020; 482:126-135. [PMID: 31954770 DOI: 10.1016/j.canlet.2020.01.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 01/08/2020] [Accepted: 01/13/2020] [Indexed: 10/25/2022]
Abstract
Glioblastoma (GBM) has limited therapeutic options. DNA repair mechanisms contribute GBM cells to escape therapies and re-establish tumor growth. Multiple studies have shown that POLD2 plays a critical role in DNA replication, DNA repair and genomic stability. We demonstrate for the first time that POLD2 is highly expressed in human glioma specimens and that expression correlates with poor patient survival. siRNA or shRNA POLD2 inhibited GBM cell proliferation, cell cycle progression, invasiveness, sensitized GBM cells to chemo/radiation-induced cell death and reversed the cytoprotective effects of EGFR signaling. Conversely, forced POLD2 expression was found to induce GBM cell proliferation, colony formation, invasiveness and chemo/radiation resistance. POLD2 expression associated with stem-like cell subsets (CD133+ and SSEA-1+ cells) and positively correlated with Sox2 expression in clinical specimens. Its expression was induced by Sox2 and inhibited by the forced differentiation of GBM neurospheres. shRNA-POLD2 modestly inhibited GBM neurosphere-derived orthotopic xenografts growth, when combined with radiation, dramatically inhibited xenograft growth in a cooperative fashion. These novel findings identify POLD2 as a new potential therapeutic target for enhancing GBM response to current standard of care therapeutics.
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Affiliation(s)
- Qingfu Xu
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, 510623, PR China; Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, PR China; Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA; Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA
| | - Chengchen Hu
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA; Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA
| | - Yan Zhu
- Department of Ultrasonography, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, 510623, PR China; Department of Obstetrics and Gynecology, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, PR China
| | - Kimberly Wang
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA
| | - Bachuchu Lal
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA
| | - Lichao Li
- Department of Neurosurgery, The First Hospital of Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Junhai Tang
- Department of Neurosurgery, Third Military Medical University, Chongqing, 400037, PR China
| | - Shuang Wei
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA
| | - Guohao Huang
- Department of Neurosurgery, Third Military Medical University, Chongqing, 400037, PR China
| | - Shuli Xia
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA; Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA
| | - Shengqing Lv
- Department of Neurosurgery, Third Military Medical University, Chongqing, 400037, PR China
| | - John Laterra
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA; Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA; Department of Oncology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA; Department of Neuroscience, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA
| | - Yugang Jiang
- Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, PR China
| | - Yunqing Li
- Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, 21205, USA; Department of Neurology, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD, 21287, USA.
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5
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Alrfaei BM, Clark P, Vemuganti R, Kuo JS. MicroRNA miR-100 Decreases Glioblastoma Growth by Targeting SMARCA5 and ErbB3 in Tumor-Initiating Cells. Technol Cancer Res Treat 2020; 19:1533033820960748. [PMID: 32945237 PMCID: PMC7502994 DOI: 10.1177/1533033820960748] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/12/2020] [Accepted: 08/28/2020] [Indexed: 01/09/2023] Open
Abstract
Glioblastoma multiforme (GBM) is the most aggressive and most frequently diagnosed malignant human glioma. Despite the best available standard of care (surgery, radiation, and chemotherapy), the median survival of GBM patients is less than 2 years. Many recent studies have indicated that microRNAs (miRNAs) are important for promoting or reducing/limiting GBM growth. In particular, we previously showed that GBMs express decreased levels of miR-100 relative to control tissue and that restoring miR-100 expression reduced GBM tumorigenicity by modulating SMRT/NCOR2 (Nuclear Receptor Corepressor 2). Here, we demonstrate that miR-100 overexpression decreases expression of the stem cell markers, nestin and L1CAM, and decreases proliferation of GBM tumor-initiating cells (cancer stem cells). We further show that miR-100-mediated anti-tumorigenic activity limits the activity of SMARCA5 and its downstream target STAT3 (known as mTOR-STAT3-Notch pathway). In addition, we report ErbB3 (Her3) as a putative miR-100 target, including inhibition of its downstream AKT and ERK signaling pathways.
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Affiliation(s)
- Bahauddeen M. Alrfaei
- Department of Neurological Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Cellular and Molecular Pathology Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Department of Cellular Therapy and Cancer Res, King Abdullah Int’l Medical Research Center (KAIMRC), King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Riyadh, Saudi Arabia
| | - Paul Clark
- Department of Neurological Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Raghu Vemuganti
- Department of Neurological Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Cellular and Molecular Pathology Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Neuroscience Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA
| | - John S. Kuo
- Department of Neurological Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Cellular and Molecular Pathology Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Neuroscience Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Department of Neurosurgery, Dell Medical School, The University of Texas at Austin, Austin, TX, USA
- Mulva Clinic for the Neurosciences, The University of Texas at Austin, Austin, TX, USA
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6
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da Silva B, Irving BK, Polson ES, Droop A, Griffiths HBS, Mathew RK, Stead LF, Marrison J, Williams C, Williams J, Short SC, Scarcia M, O'Toole PJ, Allison SJ, Mavria G, Wurdak H. Chemically induced neurite-like outgrowth reveals a multicellular network function in patient-derived glioblastoma cells. J Cell Sci 2019; 132:jcs.228452. [PMID: 31515278 DOI: 10.1242/jcs.228452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 09/02/2019] [Indexed: 12/22/2022] Open
Abstract
Tumor stem cells and malignant multicellular networks have been separately implicated in the therapeutic resistance of glioblastoma multiforme (GBM), the most aggressive type of brain cancer in adults. Here, we show that small-molecule inhibition of RHO-associated serine/threonine kinase proteins (ROCKi) significantly promoted the outgrowth of neurite-like cell projections in cultures of heterogeneous patient-derived GBM stem-like cells. These projections formed de novo-induced cellular network (iNet) 'webs', which regressed after withdrawal of ROCKi. Connected cells within the iNet web exhibited long range Ca2+ signal transmission, and significant lysosomal and mitochondrial trafficking. In contrast to their less-connected vehicle control counterparts, iNet cells remained viable and proliferative after high-dose radiation. These findings demonstrate a link between ROCKi-regulated cell projection dynamics and the formation of radiation-resistant multicellular networks. Our study identifies means to reversibly induce iNet webs ex vivo, and may thereby accelerate future studies into the biology of GBM cellular networks.
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Affiliation(s)
| | | | - Euan S Polson
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Alastair Droop
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
- Leeds Institute for Data Analytics, University of Leeds, Leeds, LS2 9JT, UK
| | - Hollie B S Griffiths
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Ryan K Mathew
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
- Department of Neurosurgery, Leeds General Infirmary, Leeds, LS1 3EX, UK
| | - Lucy F Stead
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Joanne Marrison
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Courtney Williams
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | | | - Susan C Short
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | | | - Peter J O'Toole
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Simon J Allison
- School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, UK
| | - Georgia Mavria
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Heiko Wurdak
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
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Vehlow A, Klapproth E, Storch K, Dickreuter E, Seifert M, Dietrich A, Bütof R, Temme A, Cordes N. Adhesion- and stress-related adaptation of glioma radiochemoresistance is circumvented by β1 integrin/JNK co-targeting. Oncotarget 2017; 8:49224-37. [PMID: 28514757 DOI: 10.18632/oncotarget.17480] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 04/12/2017] [Indexed: 11/25/2022] Open
Abstract
Resistance of cancer stem-like and cancer tumor bulk cells to radiochemotherapy and destructive infiltration of the brain fundamentally influence the treatment efficiency to cure of patients suffering from Glioblastoma (GBM). The interplay of adhesion and stress-related signaling and activation of bypass cascades that counteract therapeutic approaches remain to be identified in GBM cells. We here show that combined inhibition of the adhesion receptor β1 integrin and the stress-mediator c-Jun N-terminal kinase (JNK) induces radiosensitization and blocks invasion in stem-like and patient-derived GBM cultures as well as in GBM cell lines. In vivo, this treatment approach not only significantly delays tumor growth but also increases median survival of orthotopic, radiochemotherapy-treated GBM mice. Both, in vitro and in vivo, effects seen with β1 integrin/JNK co-inhibition are superior to the monotherapy. Mechanistically, the in vitro radiosensitization provoked by β1 integrin/JNK targeting is caused by defective DNA repair associated with chromatin changes, enhanced ATM phosphorylation and prolonged G2/M cell cycle arrest. Our findings identify a β1 integrin/JNK co-dependent bypass signaling for GBM therapy resistance, which might be therapeutically exploitable.
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8
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Hsu CC, Chang WC, Hsu TI, Liu JJ, Yeh SH, Wang JY, Liou JP, Ko CY, Chang KY, Chuang JY. Suberoylanilide hydroxamic acid represses glioma stem-like cells. J Biomed Sci 2016; 23:81. [PMID: 27863490 PMCID: PMC5116136 DOI: 10.1186/s12929-016-0296-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/03/2016] [Indexed: 01/07/2023] Open
Abstract
Background Glioma stem-like cells (GSCs) are proposed to be responsible for high resistance in glioblastoma multiforme (GBM) treatment. In order to find new strategies aimed at reducing GSC stemness and improving GBM patient survival, we investigated the effects and mechanism of a histone deacetylases (HDACs) inhibitor, suberoylanilide hydroxamic acid (SAHA), since HDAC activity has been linked to cancer stem-like cell (CSC) abundance and properties. Methods Human GBM cell lines were plated in serum-free suspension cultures allowed for sphere forming and CSC enrichment. Subsequently, upon SAHA treatment, the stemness markers, cell proliferation, and viability of GSCs as well as cellular apoptosis and senescence were examined in order to clarify whether inhibition of GSCs occurs. Results We demonstrated that SAHA attenuated cell proliferation and diminished the expression stemness-related markers (CD133 and Bmi1) in GSCs. Furthermore, at high concentrations (more than 5 μM), SAHA triggered apoptosis of GSCs accompanied by increases in both activation of caspase 8- and caspase 9-mediated pathways. Interestingly, we found that a lower dose of SAHA (1 μM and 2.5 μM) inhibited GSCs via cell cycle arrest and induced premature senescence through p53 up-regulation and p38 activation. Conclusion SAHA induces apoptosis and functions as a potent modulator of senescence via the p38-p53 pathway in GSCs. Our results provide a perspective on targeting GSCs via SAHA treatment, and suggest that SAHA could be used as a potent agent to overcome drug resistance in GBM patients. Electronic supplementary material The online version of this article (doi:10.1186/s12929-016-0296-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Che-Chia Hsu
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, 11031, Taiwan.,Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Wen-Chang Chang
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, 11031, Taiwan
| | - Tsung-I Hsu
- Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Jr-Jiun Liu
- Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan.,National Institute of Cancer Research, National Health Research Institutes, 367 Sheng-Li Road, Tainan, 70456, Taiwan
| | - Shiu-Hwa Yeh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli, 35053, Taiwan
| | - Jia-Yi Wang
- Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, 11031, Taiwan
| | - Jing-Ping Liou
- School of Pharmacy, Taipei Medical University, Taipei, 11031, Taiwan
| | - Chiung-Yuan Ko
- Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Kwang-Yu Chang
- National Institute of Cancer Research, National Health Research Institutes, 367 Sheng-Li Road, Tainan, 70456, Taiwan.
| | - Jian-Ying Chuang
- Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan. .,Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taipei, 11031, Taiwan.
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