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Chang YT, Chiu I, Wang Q, Bustamante J, Jiang W, Rycaj K, Yi S, Li J, Kowalski-Muegge J, Matsui W. Loss of p53 enhances the tumor-initiating potential and drug resistance of clonogenic multiple myeloma cells. Blood Adv 2023; 7:3551-3560. [PMID: 37042949 PMCID: PMC10368840 DOI: 10.1182/bloodadvances.2022009387] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 04/05/2023] [Accepted: 04/05/2023] [Indexed: 04/13/2023] Open
Abstract
Tumor relapse and drug resistance are major factors that limit the curability of multiple myeloma (MM). New regimens have improved overall MM survival rates, but patients with high-risk features continue to have inferior outcomes. Chromosome 17p13 deletion (del17p) that includes the loss of the TP53 gene is a high-risk cytogenetic abnormality and is associated with poor clinical outcomes owing to relatively short remissions and the development of pan-drug resistant disease. Increased relapse rates suggest that del17p enhances clonogenic growth, and we found that the loss of p53 increased both the frequency and drug resistance of tumor-initiating MM cells (TICs). Subsequent RNA sequencing (RNA-seq) studies demonstrated significant activation of the Notch signaling pathway and upregulation of inhibitor of DNA binding (ID1/ID2) genes in p53-knock out (p53-KO) cells. We found that the loss of ID1 or HES-1 expression or treatment with a gamma-secretase inhibitor (GSI) significantly decreased the clonogenic growth of p53-KO but not p53 wild-type cells. GSI treatment in a small set of MM specimens also reduced the clonogenic growth in del17p samples but not in non-del17p samples. This effect was specific as overexpression of the Notch intracellular domain (NICD) rescued the effects of GSI treatment. Our study demonstrates that the Notch signaling and ID1 expression are required for TIC expansion in p53-KO MM cells. These findings also suggest that GSI may be specifically active in patients with p53 mutant MM.
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Affiliation(s)
- Yu-Tai Chang
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Ian Chiu
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
- College of Natural Sciences, The University of Texas at Austin, Austin, TX
| | - Qiuju Wang
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Jorge Bustamante
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Wenxuan Jiang
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Kiera Rycaj
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Song Yi
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - Joey Li
- Department of Oncology, Sydney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jeanne Kowalski-Muegge
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
| | - William Matsui
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas at Austin, Austin, TX
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2
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Fixing the GAP: the role of RhoGAPs in cancer. Eur J Cell Biol 2022; 101:151209. [DOI: 10.1016/j.ejcb.2022.151209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 01/29/2022] [Accepted: 02/08/2022] [Indexed: 12/12/2022] Open
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3
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Fukusumi T, Guo TW, Ren S, Haft S, Liu C, Sakai A, Ando M, Saito Y, Sadat S, Califano JA. Reciprocal activation of HEY1 and NOTCH4 under SOX2 control promotes EMT in head and neck squamous cell carcinoma. Int J Oncol 2020; 58:226-237. [PMID: 33491747 PMCID: PMC7864008 DOI: 10.3892/ijo.2020.5156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 10/08/2020] [Indexed: 12/12/2022] Open
Abstract
Several comprehensive studies have demonstrated that the NOTCH pathway is altered in a bimodal manner in head and neck squamous cell carcinoma (HNSCC). In a previous study, it was found that the NOTCH4/HEY1 pathway was specifically upregulated in HNSCC and promoted epithelial-mesenchymal transition (EMT), and that HEY1 activation supported SOX2 expression. However, the interactions in this pathway have not yet been fully elucidated. The present study investigated the NOTCH4/HEY1/SOX2 axis in HNSCC using in vitro models and the Cancer Genome Atlas (TCGA) database. To explore the association, reporter and ChIP RT-qPCR assays using SOX2-overexpressing (SOX2-OE) cells were performed. The association between NOTCH4 and HEY1 was examined in the same manner using HEY1-overexpressing (HEY1-OE) cells. The results of the in vitro experiments indicated that HEY1 promoted EMT in the HNSCC cells. Furthermore, the overexpression of HEY1 also promoted sphere formation and increased murine xenograft tumorigenicity. Reporter assays and ChIP RT-qPCR experiments indicated that SOX2 regulated HEY1 expression via direct binding of the HEY1 promoter. HEY1 expression significantly correlated with SOX2 expression in primary lung SCC and other SCCs using the TCGA database. HEY1 also regulated NOTCH4 expression to create a positive reciprocal feedback loop. On the whole, the present study demonstrates that HEY1 expression in HNSCC is regulated via the promotion of SOX2 and promotes EMT. The NOTCH4/HEY1 pathway is specifically upregulated via a positive reciprocal feedback loop mediated by the HEY1-medaited regulation of NOTCH4 transcription, and SOX2 correlates with HEY1 expression in SCC from other primary sites.
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Affiliation(s)
- Takahito Fukusumi
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Theresa W Guo
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Shuling Ren
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Sunny Haft
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Chao Liu
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Akihiro Sakai
- Department of Otolaryngology‑Head and Neck Surgery, Tokai University, School of Medicine, Isehara, Kanagawa 259‑1193, Japan
| | - Mizuo Ando
- Department of Otolaryngology‑Head and Neck Surgery, University of Tokyo, Tokyo 113‑8655, Japan
| | - Yuki Saito
- Department of Otolaryngology‑Head and Neck Surgery, University of Tokyo, Tokyo 113‑8655, Japan
| | - Sayed Sadat
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Joseph A Califano
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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Ding X, Ding C, Wang F, Deng W, Yu M, Meng Q, Sun P. Effects of NOTCH1 signaling inhibitor γ-secretase inhibitor II on growth of cancer stem cells. Oncol Lett 2018; 16:6095-6099. [PMID: 30405755 DOI: 10.3892/ol.2018.9377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 02/12/2018] [Indexed: 12/22/2022] Open
Abstract
The present study aimed to observe the effect of the Notch1 signaling inhibitor γ-secretase inhibitor II (GSI II) on the growth and differentiation of tumor cells. The tumor cell line U87 was grown in serum-free media, and cell growth was evaluated using immunofluorescence. Single-cell wall-adherent growing conditions were prepared, GSI II was added, and the differentiation and growth of single tumor cells was evaluated. Immunofluorescence demonstrated positive results for the expression of Nestin and cluster of differentiation 133. The cell proliferation rate was reduced following the addition of GSI II (P<0.05). GSI II may significantly inhibit the proliferation and differentiation of U87 tumor stem cells.
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Affiliation(s)
- Xiaodong Ding
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Changqing Ding
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Fei Wang
- Department of Neurosurgery, The Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
| | - Wenshuai Deng
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Mingming Yu
- Department of Radiology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Qinghai Meng
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Peng Sun
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
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5
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Fu MH, Wang CY, Hsieh YT, Fang KM, Tzeng SF. Functional Role of Matrix gla Protein in Glioma Cell Migration. Mol Neurobiol 2018; 55:4624-4636. [PMID: 28707070 DOI: 10.1007/s12035-017-0677-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Accepted: 06/28/2017] [Indexed: 11/30/2022]
Abstract
Glioblastoma multiforme (GBM) is the most common and aggressive brain tumor subtype. Despite that metastasis of GBM beyond the central nervous system (CNS) is rare, its malignancy is attributed to the highly infiltration trait, leading to the difficulty of complete surgical excision. Matrix gla protein (MGP) is a vitamin K-dependent small secretory protein, and functions as a calcification inhibitor. The involvement of MGP function in glioma cell dynamics remains to be clarified. The study showed that a low proliferative rat C6 glioma cell line named as C6-2 exhibited faster migratory and invasive capability compared to that observed in a high tumorigenic rat C6 glioma cell line (called as C6-1). Interestingly, C6-2 cells expressed higher levels of MGP molecules than C6-1 cells did. Lentivirus-mediated short hairpin RNA (shRNA) against MGP gene expression (MGP-KD) in C6-2 cells or lentivirus-mediated overexpression of MGP transcripts in C6-1 cells resulted in the morphological alteration of the two cell lines. Moreover, MGP-KD caused a decline in cell migration and invasion ability of C6-2 cells. In contrast, increased expression of MGP in C6-1 cells promoted their cell migration and invasion. The observations were further verified by the results from the implantation of C6-1 and C6-2 cells into ex vivo brain slice and in vivo rat brain. Thus, our results demonstrate that the manipulation of MGP expression in C6 glioma cells can mediate glioma cell migratory activity. Moreover, our findings indicate the possibility that high proliferative glioma cells expressing a high level of MGP may exist and contribute to tumor infiltration and recurrence.
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Affiliation(s)
- Mu-Hui Fu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chih-Yen Wang
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, #1 University Road, Tainan City, 70101, Taiwan
| | - Yun-Ti Hsieh
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, #1 University Road, Tainan City, 70101, Taiwan
| | - Kuan-Min Fang
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, #1 University Road, Tainan City, 70101, Taiwan
| | - Shun-Fen Tzeng
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, #1 University Road, Tainan City, 70101, Taiwan.
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6
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The role of Notch signaling in gastric carcinoma: molecular pathogenesis and novel therapeutic targets. Oncotarget 2017; 8:53839-53853. [PMID: 28881855 PMCID: PMC5581154 DOI: 10.18632/oncotarget.17809] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 04/17/2017] [Indexed: 12/14/2022] Open
Abstract
Notch signaling, an evolutionarily conserved signaling cascade system, is involved in promoting the progression of different types of cancers. Within the past decades, the Notch signaling pathway has increasingly been shown to have a primary role in deciding the fate of cancer cells and cancer stem cells in the stomach. Most components of Notch signaling are strongly expressed at different levels in gastric carcinoma tissue samples and are associated with a considerable number of clinical parameters. Moreover, crosstalk signaling between the Notch pathway and the Wnt, Ras, and NF-κB pathways promotes the process of gastric carcinogenesis. Consequently, this increases proliferation and prevents apoptosis in gastric cancer cells, and it contributes to the induction of angiogenesis and accelerates the progression of the epithelial-to-mesenchymal transition. Although the Notch signaling pathway presents novel therapeutic targets for cancer therapeutic intervention, there is still a dearth of in-depth understanding of the molecular mechanisms of Notch signaling in gastric carcinoma. In this review, we summarize the landscape of the Notch signaling pathway and recent findings on Notch signaling in gastric cancer. Furthermore, advanced studies and clinical treatments targeting the Notch signaling pathway arediscussed.
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7
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HES1 in immunity and cancer. Cytokine Growth Factor Rev 2016; 30:113-7. [PMID: 27066918 DOI: 10.1016/j.cytogfr.2016.03.010] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 03/18/2016] [Accepted: 03/18/2016] [Indexed: 01/06/2023]
Abstract
Hairy and enhancer of split homolog-1 (HES1) is a part of an extensive family of basic helix-loop-helix (bHLH) proteins and plays a crucial role in the control and regulation of cell cycle, proliferation, cell differentiation, survival and apoptosis in neuronal, endocrine, T-lymphocyte progenitors as well as various cancers. HES1 is a transcription factor which is regulated by the NOTCH, Hedgehog and Wnt signalling pathways. Aberrant expression of these pathways is a common feature of cancerous cells. There appears to be a fine and complicated crosstalk at the molecular level between the various signalling pathways and HES1, which contributes to its effects on the immune response and cancers such as leukaemia. Several mechanisms have been proposed, including an enhanced invasiveness and metastasis by inducing epithelial mesenchymal transition (EMT), in addition to its strict requirement for tumour cell survival. In this review, we summarize the current biology and molecular mechanisms as well as its use as a clinical target in cancer therapeutics.
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SUN JIANJUN, WANG ZHENYU, LI LINGSONG, LIU BIN. Peking University - Juntendo University Joint Symposium on Brain and Skin Diseases. JUNTENDO MEDICAL JOURNAL 2016. [DOI: 10.14789/jmj.62.311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- JIANJUN SUN
- Department of Neurosurgery, Peking University Third Hospital
| | - ZHENYU WANG
- Department of Neurosurgery, Peking University Third Hospital
| | - LINGSONG LI
- China Stem Cell Research Center, Peking University Health Science Center
| | - BIN LIU
- Department of Neurosurgery, Peking University Third Hospital
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9
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Abstract
Hes1 is one mammalian counterpart of the Hairy and Enhancer of split proteins that play a critical role in many physiological processes including cellular differentiation, cell cycle arrest, apoptosis and self-renewal ability. Recent studies have shown that Hes1 functions in the maintenance of cancer stem cells (CSCs), metastasis and antagonizing drug-induced apoptosis. Pathways that are involved in the up-regulation of Hes1 level canonically or non-canonically, such as the Hedgehog, Wnt and hypoxia pathways are frequently aberrant in cancer cells. Here, we summarize the recent data supporting the idea that Hes1 may have an important function in the maintenance of cancer stem cells self-renewal, cancer metastasis, and epithelial-mesenchymal transition (EMT) process induction, as well as chemotherapy resistance, and conclude with the possible mechanisms by which Hes1 functions have their effect, as well as their crosstalk with other carcinogenic signaling pathways.
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Key Words
- ABC, ATP-binding cassette
- CSCs, cancer stem cells
- CSL, CBF1/ Suppressor of Hairless / Lag1
- EMT, epithelial–mesenchymal transition
- GSI, γ-secretase inhibitor
- HDACs, histone deacetylases
- Hes1
- MAML, Mastermind-like protein family
- MASH-1, Mammalian achaete-scute homolog-1
- NICD, Notch intracellular domain
- Notch signaling pathway
- Runx2, Runt-related protein 2
- TLE, transducin-like Enhancer of split
- bHLH, basic helix-loop-helix
- cancer stem cell
- chemotherapy resistance
- dnMAM, dominant-negative mastermind
- metastasis
- non-canonical Notch
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Chai KM, Wang CY, Liaw HJ, Fang KM, Yang CS, Tzeng SF. Downregulation of BRCA1-BRCA2-containing complex subunit 3 sensitizes glioma cells to temozolomide. Oncotarget 2015; 5:10901-15. [PMID: 25337721 PMCID: PMC4279418 DOI: 10.18632/oncotarget.2543] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Accepted: 09/29/2014] [Indexed: 12/19/2022] Open
Abstract
We previously found that BRCA1-BRCA2-containing complex subunit 3 (BRCC3) was highly expressed in tumorigenic rat glioma cells. However, the functional role of BRCC3 in human glioma cells remains to be characterized. This study indicated that the upregulation of BRCC3 expression was induced in two human malignant glioblastoma U251 and A172 cell lines following exposure to the alkylating agent, temozolomide (TMZ). Homologous recombination (HR)-dependent DNA repair-associated genes (i.e. BRCA1, BRCA2, RAD51 and FANCD2) were also increased in U251 and A172 cells after treatment with TMZ. BRCC3 gene knockdown through lentivirus-mediated gene knockdown approach not only significantly reduced the clonogenic and migratory abilities of U251 and A172 cells, but also enhanced their sensitization to TMZ. The increase in phosphorylated H2AX foci (γH2AX) formation, an indicator of DNA damage, persisted in TMZ-treated glioma cells with stable knockdown BRCC3 expression, suggesting that BRCC3 gene deficiency is associated with DNA repair impairment. In summary, we demonstrate that by inducing DNA repair, BRCC3 renders glioma cells resistant to TMZ. The findings point to BRCC3 as a potential target for treatment of alkylating drug-resistant glioma.
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Affiliation(s)
- Kit Man Chai
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan City, 70101, Taiwan
| | - Chih-Yen Wang
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan City, 70101, Taiwan
| | - Hung-Jiun Liaw
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan City, 70101, Taiwan
| | - Kuan-Min Fang
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan City, 70101, Taiwan
| | - Chung-Shi Yang
- Center for Nanomedicine Research, National Health Research Institutes, Zhunan, 35053, Taiwan
| | - Shun-Fen Tzeng
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan City, 70101, Taiwan
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Fang KM, Liu JJ, Li CC, Cheng CC, Hsieh YT, Chai KM, Lien YA, Tzeng SF. Colchicine derivative as a potential anti-glioma compound. J Neurooncol 2015; 124:403-12. [DOI: 10.1007/s11060-015-1874-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 07/27/2015] [Indexed: 12/28/2022]
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12
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Sun JJ, Wang ZY, Li LS, Yu HY, Xu YS, Wu HB, Luo Y, Liu B, Zheng M, Mao JL, Lou XH. Prevention against diffuse spinal cord astrocytoma: can the Notch pathway be a novel treatment target? Neural Regen Res 2015; 10:244-51. [PMID: 25883623 PMCID: PMC4392672 DOI: 10.4103/1673-5374.152378] [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] [Accepted: 10/04/2014] [Indexed: 11/25/2022] Open
Abstract
This study was designed to investigate whether the Notch pathway is involved in the development of diffuse spinal cord astrocytomas. BALB/c nude mice received injections of CD133+ and CD133− cell suspensions prepared using human recurrent diffuse spinal cord astrocytoma tissue through administration into the right parietal lobe. After 7–11 weeks, magnetic resonance imaging was performed weekly. Xenografts were observed on the surfaces of the brains of mice receiving the CD133+ cell suspension, and Notch-immunopositive expression was observed in the xenografts. By contrast, no xenografts appeared in the identical position on the surfaces of the brains of mice receiving the CD133− cell suspension, and Notch-immunopositive expression was hardly detected either. Hematoxylin-eosin staining and immunohistochemical staining revealed xenografts on the convex surfaces of the brains of mice that underwent CD133+ astrocytoma transplantation. Some sporadic astroglioma cells showed pseudopodium-like structures, which extended into the cerebral white matter. However, it should be emphasized that the subcortex xenograft with Notch-immunopositive expression was found in the fourth mouse received injection of CD133− astrocytoma cells. However, these findings suggest that the Notch pathway plays an important role in the formation of astrocytomas, and can be considered a novel treatment target for diffuse spinal cord astrocytoma.
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Affiliation(s)
- Jian-Jun Sun
- Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China
| | - Zhen-Yu Wang
- Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China
| | - Ling-Song Li
- China Stem Cell Research Center, Peking University Health Science Center, Peking University, Beijing, China
| | - Hai-Yan Yu
- Clinical Stem Cell Center, Peking University Third Hospital, Peking University, Beijing, China
| | - Yong-Sheng Xu
- Clinical Stem Cell Center, Peking University Third Hospital, Peking University, Beijing, China ; Clinical Laboratory of Tissue & Cell Research Center, Department of Biotech Treatment, Logistics College of Chinese People's Armed Police Force, Tianjin, China
| | - Hai-Bo Wu
- Department of Neuroradiology, Peking University Third Hospital, Peking University, Beijing, China
| | - Yi Luo
- Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China
| | - Bin Liu
- Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China
| | - Mei Zheng
- Department of Neurology, Peking University Third Hospital, Peking University, Beijing, China
| | - Jin-Long Mao
- Neurosurgical Department, Peking Union Medical College Hospital, Beijing, China
| | - Xiao-Hui Lou
- Department of Neurosurgery, Rui'an People's Hospital, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
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Wang CY, Yang SH, Tzeng SF. MicroRNA-145 as one negative regulator of astrogliosis. Glia 2014; 63:194-205. [PMID: 25139829 DOI: 10.1002/glia.22743] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 08/01/2014] [Indexed: 11/09/2022]
Abstract
Astrogliosis occurs at the lesion site within days to weeks after spinal cord injury (SCI) and involves the proliferation and hypertrophy of astrocytes, leading to glia scar formation. Changes in gene expression by deregulated microRNAs (miRNAs) are involved in the process of central nervous system neurodegeneration. Here, we report that mir-145, a miRNA enriched in rat spinal neurons and astrocytes, was downregulated at 1 week and 1 month after SCI. Our in vitro studies using astrocytes prepared from neonatal spinal cord tissues indicated that potent inflammagen lipopolysaccharide downregulated mir-145 expression in astrocytes, suggesting that SCI-triggered inflammatory signaling pathways could play the inhibitory role in astrocytic mir-145 expression. To induce overexpression of mir-145 in astrocytes at the spinal cord lesion site, we developed a lentivirus-mediated pre-miRNA delivery system using the promoter of glial fibrillary acidic protein (GFAP), an astrocyte-specific intermediate filament. The results indicated that astrocyte-specific overexpression of mir-145 reduced astrocytic cell density at the lesion border of the injured spinal cord. In parallel, overexpression of mir-145 reduced the size of astrocytes and the number of related cell processes, as well as cell proliferation and migration. Through a luciferase reporter system, we found that GFAP and c-myc were the two potential targets of mir-145 in astrocytes. Together, the findings demonstrate the novel role of mir-145 in the regulation of astrocytic dynamics, and reveal that the downregulation of mir-145 in astrocytes is a critical factor inducing astrogliosis after SCI. GLIA 2015;63:194-205.
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Affiliation(s)
- Chih-Yen Wang
- Department of Life Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan
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