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Zhang J, Liu B, Xu C, Ji C, Yin A, Liu Y, Yao Y, Li B, Chen T, Shen L, Wu Y. Cholesterol homeostasis confers glioma malignancy triggered by hnRNPA2B1-dependent regulation of SREBP2 and LDLR. Neuro Oncol 2024; 26:684-700. [PMID: 38070488 PMCID: PMC10995519 DOI: 10.1093/neuonc/noad233] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024] Open
Abstract
BACKGROUND Dysregulation of cholesterol metabolism is a significant characteristic of glioma, yet the underlying mechanisms are largely unknown. N6-methyladenosine (m6A) modification has been implicated in promoting tumor development and progression. The aim of this study was to determine the key m6A regulatory proteins involved in the progression of glioma, which is potentially associated with the reprogramming of cholesterol homeostasis. METHODS Bioinformatics analysis was performed to determine the association of m6A modification with glioma malignancy from The Cancer Genome Atlas and Genotype-Tissue Expression datasets. Glioma stem cell (GSC) self-renewal was determined by tumor sphere formation and bioluminescence image assay. RNA sequencing and lipidomic analysis were performed for cholesterol homeostasis analysis. RNA immunoprecipitation and luciferase reporter assay were performed to determine hnRNPA2B1-dependent regulation of sterol regulatory element-binding protein 2 (SREBP2) and low-density lipoprotein receptor (LDLR) mRNA. The methylation status of hnRNPA2B1 promoter was determined by bioinformatic analysis and methylation-specific PCR assay. RESULTS Among the m6A-regulatory proteins, hnRNPA2B1 was demonstrated the most important independent prognostic risk factor for glioma. hnRNPA2B1 ablation exhibited a significant tumor-suppressive effect on glioma cell proliferation, GSC self-renewal and tumorigenesis. hnRNPA2B1 triggers de novo cholesterol synthesis by inducing HMGCR through the stabilization of SREBP2 mRNA. m6A modification of SREBP2 or LDLR mRNA is required for hnRNPA2B1-mediated mRNA stability. The hypomethylation of cg21815882 site on hnRNPA2B1 promoter confers elevated expression of hnRNPA2B1 in glioma tissues. The combination of targeting hnRNPA2B1 and cholesterol metabolism exhibited remarkable antitumor effects, suggesting valuable clinical implications for glioma treatment. CONCLUSIONS hnRNPA2B1 facilitates cholesterol uptake and de novo synthesis, thereby contributing to glioma stemness and malignancy.
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Affiliation(s)
- Juan Zhang
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Bei Liu
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
- Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, China
- Department of Aerospace Hygiene, School of Aerospace Medicine, Fourth Military Medical University, Xi’an, China
| | - Changwei Xu
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Chenchen Ji
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers and National Clinical Research Center for Digestive Diseases, Fourth Military Medical University, Xi’an, China
| | - Anan Yin
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
- Department of Plastic and Reconstructive Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, China
| | - Yifeng Liu
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Yan Yao
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Bowen Li
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
- Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, China
- Department of Aerospace Hygiene, School of Aerospace Medicine, Fourth Military Medical University, Xi’an, China
| | - Tangdong Chen
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Liangliang Shen
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
- State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers and National Clinical Research Center for Digestive Diseases, Fourth Military Medical University, Xi’an, China
| | - Yuanming Wu
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Shaanxi Provincial Key Laboratory of Clinical Genetics, Fourth Military Medical University, Xi’an, Shaanxi, China
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Yoon J, Grinchuk OV, Kannan S, Ang MJY, Li Z, Tay EXY, Lok KZ, Lee BWL, Chuah YH, Chia K, Tirado Magallanes R, Liu C, Zhao H, Hor JH, Lim JJ, Benoukraf T, Toh TB, Chow EKH, Kovalik JP, Ching J, Ng SY, Koh MJ, Liu X, Verma CS, Ong DST. A chemical biology approach reveals a dependency of glioblastoma on biotin distribution. SCIENCE ADVANCES 2021; 7:eabf6033. [PMID: 34516894 PMCID: PMC8442857 DOI: 10.1126/sciadv.abf6033] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 07/14/2021] [Indexed: 06/13/2023]
Abstract
Glioblastoma (GBM) is a uniformly lethal disease driven by glioma stem cells (GSCs). Here, we use a chemical biology approach to unveil previously unknown GBM dependencies. By studying sulconazole (SN) with anti-GSC properties, we find that SN disrupts biotin distribution to the carboxylases and histones. Transcriptomic and metabolomic analyses of SN-treated GSCs reveal metabolic alterations that are characteristic of biotin-deficient cells, including intracellular cholesterol depletion, impairment of oxidative phosphorylation, and energetic crisis. Furthermore, SN treatment reduces histone biotinylation, histone acetylation, and expression of superenhancer-associated GSC critical genes, which are also observed when biotin distribution is genetically disrupted by holocarboxylase synthetase (HLCS) depletion. HLCS silencing impaired GSC tumorigenicity in an orthotopic xenograft brain tumor model. In GBM, high HLCS expression robustly indicates a poor prognosis. Thus, the dependency of GBM on biotin distribution suggests that the rational cotargeting of biotin-dependent metabolism and epigenetic pathways may be explored for GSC eradication.
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Affiliation(s)
- Jeehyun Yoon
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Oleg V. Grinchuk
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Srinivasaraghavan Kannan
- Biomolecular Modeling and Design Division, Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore 138671, Singapore
| | - Melgious Jin Yan Ang
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
- NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, Singapore 119077, Singapore
| | - Zhenglin Li
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Emmy Xue Yun Tay
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Ker Zhing Lok
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Bernice Woon Li Lee
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - You Heng Chuah
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Kimberly Chia
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Roberto Tirado Magallanes
- Cancer Science Institute of Singapore, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore
| | - Chenfei Liu
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Haonan Zhao
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Jin Hui Hor
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore , Singapore
| | - Jhin Jieh Lim
- Cancer Science Institute of Singapore, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore
| | - Touati Benoukraf
- Cancer Science Institute of Singapore, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore
- Division of BioMedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL A1B 3V6, Canada
| | - Tan Boon Toh
- The N.1 Institute for Health, National University of Singapore, Singapore , Singapore
- Institute for Digital Medicine (WisDM), Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Edward Kai-Hua Chow
- Cancer Science Institute of Singapore, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Jean-Paul Kovalik
- Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Jianhong Ching
- Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Shi-Yan Ng
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore , Singapore
- National Neuroscience Institute, Singapore 308433, Singapore
| | - Ming Joo Koh
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Xiaogang Liu
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Chandra Shekhar Verma
- Biomolecular Modeling and Design Division, Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore 138671, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Derrick Sek Tong Ong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore , Singapore
- National Neuroscience Institute, Singapore 308433, Singapore
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Bi J, Chowdhry S, Wu S, Zhang W, Masui K, Mischel PS. Altered cellular metabolism in gliomas - an emerging landscape of actionable co-dependency targets. Nat Rev Cancer 2020; 20:57-70. [PMID: 31806884 DOI: 10.1038/s41568-019-0226-5] [Citation(s) in RCA: 177] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/31/2019] [Indexed: 12/18/2022]
Abstract
Altered cellular metabolism is a hallmark of gliomas. Propelled by a set of recent technological advances, new insights into the molecular mechanisms underlying glioma metabolism are rapidly emerging. In this Review, we focus on the dynamic nature of glioma metabolism and how it is shaped by the interaction between tumour genotype and brain microenvironment. Recent advances integrating metabolomics with genomics are discussed, yielding new insight into the mechanisms that drive glioma pathogenesis. Studies that shed light on interactions between the tumour microenvironment and tumour genotype are highlighted, providing important clues as to how gliomas respond to and adapt to their changing tissue and biochemical contexts. Finally, a road map for the discovery of potential new glioma drug targets is suggested, with the goal of translating these new insights about glioma metabolism into clinical benefits for patients.
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Affiliation(s)
- Junfeng Bi
- Ludwig Institute for Cancer Research, University of California San Diego, La Jolla, CA, USA
| | - Sudhir Chowdhry
- Ludwig Institute for Cancer Research, University of California San Diego, La Jolla, CA, USA
| | - Sihan Wu
- Ludwig Institute for Cancer Research, University of California San Diego, La Jolla, CA, USA
| | - Wenjing Zhang
- Ludwig Institute for Cancer Research, University of California San Diego, La Jolla, CA, USA
| | - Kenta Masui
- Department of Pathology, Tokyo Women's Medical University, Tokyo, Japan
| | - Paul S Mischel
- Ludwig Institute for Cancer Research, University of California San Diego, La Jolla, CA, USA.
- Department of Pathology, UCSD School of Medicine, La Jolla, CA, USA.
- Moores Cancer Center, UCSD School of Medicine, La Jolla, CA, USA.
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4
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Stigmasterol activates Cdc42-Arp2 and Erk1/2-Creb pathways to enrich glutamatergic synapses in cultures of brain neurons. Nutr Res 2018; 56:71-78. [DOI: 10.1016/j.nutres.2018.04.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 04/26/2018] [Accepted: 04/27/2018] [Indexed: 12/30/2022]
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5
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Jayalakshmi K, Sonkar K, Behari A, Kapoor VK, Sinha N. Lipid profiling of cancerous and benign gallbladder tissues by 1H NMR spectroscopy. NMR IN BIOMEDICINE 2011; 24:335-342. [PMID: 22945290 DOI: 10.1002/nbm.1594] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Revised: 05/24/2010] [Accepted: 07/04/2010] [Indexed: 06/01/2023]
Abstract
Qualitative and quantitative (1) H NMR analysis of lipid extracts of gallbladder tissue in chronic cholecystitis (CC, benign) (n = 14), xanthogranulomatous cholecystitis (XGC, intermediate) (n = 9) and gallbladder cancer (GBC, malignant) (n = 8) was carried out to understand the mechanisms involved in the transformation of benign gallbladder tissue to intermediate and malignant tissue. The results revealed alterations in various tissue lipid components in gallbladder in CC, XGC and GBC. The difference in the nature of lipid components in benign and malignant disease may aid in the identification of the biological pathways involved in the etiopathogenesis of GBC. This is the first study on lipid profiling of gallbladder tissue by (1) H NMR spectroscopy, and has possible implications for the development of future diagnostic approaches.
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6
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Srivastava NK, Pradhan S, Gowda GAN, Kumar R. In vitro, high-resolution 1H and 31P NMR based analysis of the lipid components in the tissue, serum, and CSF of the patients with primary brain tumors: one possible diagnostic view. NMR IN BIOMEDICINE 2010; 23:113-122. [PMID: 19774696 DOI: 10.1002/nbm.1427] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In vitro, high-resolution (1)H and (31)P NMR based qualitative and quantitative analyses of the lipid components of the tissue, serum, and CSF of patients with primary brain tumors were performed. Proton NMR spectra of the lipid extract of serum (blood specimen collected before the surgical procedure) and surgically discarded tissue showed that the total cholesterol (T.CHOL) and choline containing phospholipids (PL) were significantly higher in quantity in medulloblastoma and glioblastoma multiforme as compared to normal subjects. Serum lipid extracts of grade II/ III gliomas showed a higher quantity of PL than normal subjects. Cholesterol esters (CHOLest) were detectable in the tissue lipid extract of the patients with tumors and absent in normal tissue. There was a reduction in the quantity of CHOLest in the serum lipid extract of the tumor patients as compared to normal subjects. Ratio of PL to T.CHOL in serum lipid extract showed a significant difference between different grades of tumors versus normal subjects, while, a significant difference was observed only in medulloblastoma versus normal subjects in tissue lipid extract. Ratio of CHOL to CHOLest distinguishes the different grades of tumors versus normal subjects as well as between different grades of tumors (except medulloblastoma versus glioblastoma). The ratio of the Ph (total phospholipids except phosphatidylcholine) to PC (phosphatidylcholine) in (31)P NMR based study showed a significant difference in all grades of tumors (except medulloblastoma) in normal subjects in tissue lipid extract as well as between different grades of tumors. Medulloblastoma could be differentiated from glioblastoma as well as from normal subjects in serum lipid extract by the ratio of the Ph to PC. Proton NMR spectra of the lipid extract of CSF showed that the CHOL, CHOLest, and PL were present in the patients with tumors, although these were absent in the patients with meningitis, motor neuron disease, and mitochondrial myopathies as well as in normal subjects. PL and T.CHOL provided discrimination between different grades of tumors (except glioblastoma versus medulloblastoma) in the lipid extract of the CSF. This study suggests the role of lipid estimation in CSF and serum as a complementary diagnostic tool for the evaluation of brain tumors preoperatively. NMR-based lipid estimation of post-surgical tumor tissue may also contribute to differentiating the tumor types.
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Affiliation(s)
- Niraj Kumar Srivastava
- Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow 226014, India
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7
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Schaller B, Rüegg SJ. Brain tumor and seizures: pathophysiology and its implications for treatment revisited. Epilepsia 2003; 44:1223-32. [PMID: 12919395 DOI: 10.1046/j.1528-1157.2003.05203.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Seizures affect approximately 50% of patients with primary and metastatic brain tumors. Partial seizures have the highest incidence, followed by secondarily generalized, depending on histologic subtype, location, and tumor extent. The underlying pathophysiologic mechanisms of tumor-associated seizures are poorly understood and include theories of altered peritumoral amino acids, regional metabolism, pH, neuronal or glial enzyme and protein expression, as well as immunologic activity. An involvement of changed distribution and function of N-methyl-d-aspartate subclass of glutamate receptors also has been suggested. The often unpredictable responses to seizures after surgical tumor removal add substantial evidence that multiple factors are involved. The therapy of tumor-related seizures is far from perfect. Several factors contribute to these treatment difficulties, such as tumor growth and drug interactions; however, one of the main reasons for poor seizure control may result from the insufficient or even absent influence of the currently available antiepileptic drugs (AEDs) on most of the pathophysiologic mechanisms of tumor-related seizures. Studies are needed to elucidate more clearly the pathophysiologic mechanisms of tumor-related seizures and to identify and develop the optimal AEDs.
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8
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Ji B, Peacock G, Lu DR. Synthesis of cholesterol-carborane conjugate for targeted drug delivery. Bioorg Med Chem Lett 2002; 12:2455-8. [PMID: 12161156 DOI: 10.1016/s0960-894x(02)00426-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The cholesterol-carborane conjugate has been designed and synthesized to selectively deliver boron to tumor cells by means of reconstituted low-density lipoprotein. The chemical stability and cytotoxicity of the new compound have been examined. Several methods have been evaluated for incorporation of the compound into LDL.
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Affiliation(s)
- Bingqing Ji
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, GA 30602, Athens, USA
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9
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Shibata Y, Matsumura A, Yoshida F, Yamamoto T, Nakai K, Nose T, Sakata I, Nakajima S. Competitive uptake of porphyrin and LDL via the LDL receptor in glioma cell lines: flow cytometric analysis. Cancer Lett 2001; 166:79-87. [PMID: 11295290 DOI: 10.1016/s0304-3835(00)00717-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We examined the simultaneous uptake of porphyrin and (LDL) by four established cell lines of glioma and normal fibroblasts using flow cytometry (FCM). The results indicated porphyrin and LDL showed competitive conjugation with the LDL receptor. These results support the theory of the porphyrin uptake via the LDL receptor.
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Affiliation(s)
- Y Shibata
- Department of Neurosurgery, University of Tsukuba, Tsukuba, 305-8575, Ibaraki, Japan
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10
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Sparks DL, Lue LF, Martin TA, Rogers J. Neural tract tracing using Di-I: a review and a new method to make fast Di-I faster in human brain. J Neurosci Methods 2000; 103:3-10. [PMID: 11074091 DOI: 10.1016/s0165-0270(00)00291-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The use of Di-I in tract-tracing is briefly reviewed and a novel delayed-fixation approach to neural tract-tracing in the postmortem human adult brain is reported. Using the new approach, fast Di-I, a highly lipophilic fluorescent dye was injected into a particular region or nucleus and labelled tracts were followed for distances of some 20-40 mm. The procedure required approximately 36 h, yielding dye penetration rates of 1.0 mm/h or more. This contrasts with previous Di-I, silver impregnation, and horseradish peroxidase protocols, where the tracer penetration rate is typically 0.003 mm/h or less, and the distance traversed amounts to only a few mm even after months of incubation. The new method hinges on the simple consideration that aldehyde fixation, which is normally employed prior to administration of the marker, crosslinks membrane proteins and impedes dye diffusion. The short postmortem samples used in our protocol permit delaying fixation until after the dye has had time to penetrate, dramatically increasing the length and scope of neural circuits that can be traced. Using these methods, for example, we have confirmed the presence of an ipsilateral olivocerebellar climbing fiber projection in the human.
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Affiliation(s)
- D L Sparks
- Haldeman Laboratory for Alzheimers Disease, Roberts Center for Alzheimer's Research, Sun Health Research Institute, Sun City, AZ 85372, USA.
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11
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Matsumura A, Shibata Y, Yamamoto T, Yoshida F, Isobe T, Nakai K, Hayakawa Y, Kiriya M, Shimojo N, Ono K, Sakata I, Nakajima S, Okumura M, Nose T. A new boronated porphyrin (STA-BX909) for neutron capture therapy: an in vitro survival assay and in vivo tissue uptake study. Cancer Lett 1999; 141:203-9. [PMID: 10454263 DOI: 10.1016/s0304-3835(99)00105-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A new boronated porphyrin compound (STA-BX909) was developed as a possible agent for boron neutron capture therapy. The boron concentration was measured by an in vivo rat experimental brain tumor model and an in vitro cell culture study. This agent was compared to sodium borocaptate (BSH) which has been used in clinical trials of boron neutron capture therapy. In the 9L rat brain tumor model, STA-BX909 achieved a higher boron tumor/blood ratio 24 h after injection in comparison to BSH. A boron concentration study in cultured glioma cell lines (U-251, U-87, 9L) demonstrated an increased boron concentration as a function of exposure time to STA-BX909, while the boron concentration remained stable with increasing exposure time to BSH. Use of a colony forming assay with thermal neutron irradiation revealed more cytotoxicity with STA-BX909 than BSH when the same concentration of 10B was administered. We concluded that STA-BX909 may be an effective drug for use in boron neutron capture therapy and that it merits further investigation.
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Affiliation(s)
- A Matsumura
- Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
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12
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Grieb P, Ryba MS, Jagielski J, Gackowski W, Paczkowski P, Chrapusta SJ. Serum cholesterol in cerebral malignancies. J Neurooncol 1999; 41:175-80. [PMID: 10222438 DOI: 10.1023/a:1006131418126] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Reduced blood cholesterol levels were reported in patients with a variety of malignant peripheral tumors. This fact is likely related to increased cholesterol demand by proliferating tumor cells. The question arises whether this 'tumor-associated hypocholesterolemia' occurs also in patients with brain tumors, and--if it does not--whether its absence can be related to the location of the tumors. We have compared fasting serum total cholesterol levels among three groups of patients: 52 patients with gliomas, 56 patients with symptomatic metastatic brain tumors, and 50 patients harboring malignant tumors of peripheral location but showing no clinical signs of brain metastases. Patients in the last group, despite being--on an average--more age-advanced, had lower total serum cholesterol levels than either the patients with gliomas, or the patients with brain metastases. No difference in the cholesterol levels was found between the two latter groups, and a majority of these patients had borderline or elevated cholesterol levels. This apparent absence of 'tumor-associated hypocholesterolemia' in brain tumor patients may be related to either brain tumors' ability to synthesize cholesterol de novo and their reduced dependence on peripheral cholesterol supply, the existence of brain tumor-blood barrier, effect of medications used to counteract brain edema and seizures, or a combination of these factors.
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Affiliation(s)
- P Grieb
- Laboratory of Experimental Pharmacology, Polish Academy of Sciences Medical Research Centre, Warsaw, Poland.
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13
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Fujimori H, Matsumura A, Yamamoto T, Shibata Y, Yoshizawa T, Nakagawa K, Yoshii Y, Nose T, Sakata I, Nakajima S. Tumor specific contrast enhancement study of Mn-metalloporphyrin (ATN-10)--comparison of rat brain tumor model, cytotoxic and vasogenic edema models. ACTA NEUROCHIRURGICA. SUPPLEMENT 1998; 70:167-9. [PMID: 9416311 DOI: 10.1007/978-3-7091-6837-0_51] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
ATN-10, Mn-metalloporphyrin, has been developed as a tumor selective contrast agent for magnetic resonance (MR) imaging. To investigate the tumor specificity of ATN-10, we produced three experimental in vivo models; rat bran tumor (9L glioma) model, vasogenic (cold injury) and cytotoxic brain edema (24-hour MCA occlusion) models. The time course of contrast enhancement was compared after intravenous injection of ATN-10 or Gd-DTPA, measuring the signal intensity of the region of interest. After ATN-10 administration, the 9L glioma model showed early (5 min) and delayed (24 hr-) peak enhancement whereas the cold injury model showed only early enhancement and the 24-hour MCA occlusion model did not show significant enhancement. After Gd-DTPA administration, all three models showed similar pattern of only early enhancement. As a contrast agent for MR imaging, ATN-10 showed different behavior than Gd-DTPA in demonstrating the blood-brain barrier disruption and moreover ATN-10 showed selective enhancement in experimental brain tumors.
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Affiliation(s)
- H Fujimori
- Department of Neurosurgery, University of Tsukuba, Japan
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14
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Notarnicola M, Linsalata M, Caruso MG, Cavallini A, Di Leo A. Low density lipoprotein receptors and polyamine levels in human colorectal adenocarcinoma. J Gastroenterol 1995; 30:705-9. [PMID: 8963386 DOI: 10.1007/bf02349635] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The low density lipoprotein receptor (LDLR) is a cell surface protein that binds with LDL, providing the cell with cholesterol for new membrane synthesis. Rapidly growing cells have high numbers of LDLRs, and these proteins have also been detected in neoplastic samples of human colorectal mucosa. Polyamines, putrescine, spermidine, and spermine, play an important role in cellular growth, and studies on colorectal cancers have demonstrated higher polyamine levels in neoplastic mucosa samples than in surrounding mucosa. The aim of this study was to investigate LDLR and polyamine levels in the neoplastic tissue of 43 patients (28 males and 15 females) with colorectal adenocarcinoma, using enzymatic immunoassay and high performance liquid chromatography, respectively. Specimens of neoplastic mucosa were considered LDLR-positive or LDLR-negative when the amount of bound human anti-LDLR antibody detected was equal or higher or lower than the cut-off value (0.5 ng of bound anti-LDLR Ab/mg protein), respectively. Twenty-one subjects were LDLR-positive and 22 LDLR-negative. Polyamine levels (nmol/g tissue) were higher in LDLR-positive specimens; this increase was significant for total polyamines (P < 0.05). These findings, reporting the presence of increased polyamine content in LDLR-positive colorectal neoplastic specimens, suggest an association between LDLR levels and gastrointestinal neoplastic proliferative activity.
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Affiliation(s)
- M Notarnicola
- Scientific Institute for Digestive Diseases, I.R.C.C.S. "S. de Bellis", Castellana, Italy
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Leppälä J, Kallio M, Nikula T, Nikkinen P, Liewendahl K, Jääskeläinen J, Savolainen S, Gylling H, Hiltunen J, Callaway J. Accumulation of 99mTc-low-density lipoprotein in human malignant glioma. Br J Cancer 1995; 71:383-7. [PMID: 7841057 PMCID: PMC2033577 DOI: 10.1038/bjc.1995.78] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Low-density lipoprotein (LDL) uptake in gliomas was studied to find out if LDL has potential as a drug carrier of boron, especially for boron neutron capture therapy. Single photon emission tomography (SPET) was performed 2 h and 20 h after intravenous injection of autologous 99mTc-labelled LDL in four patients with untreated and five patients with recurrent glioma. 99mTc-LDL uptake was compared with the uptake of 99mTc-labelled human serum albumin (HSA), an established blood pool marker. The intra- and peritumoral distributions of radioactivity in the SPET images were not identical for radiolabelled LDL and HSA. The mean LDL tumour to brain ratio, determined from transversal SPET slices at 20 h post injection, was 1.5 in untreated and 2.2 in recurrent gliomas; the corresponding ratios for HSA were 1.6 and 3.4. The brain to blood ratio remained constant at 2 h and 20 h in both types of tumours. These data are not consistent with highly selective, homogeneous uptake of LDL in gliomas. However, the different tumoral distribution and rate of uptake of 99mTc-LDL, as compared with 99mTc-HSA, indicate that the uptake of LDL is different from that of HSA and that further studies on the mechanism of LDL uptake in glioma are warranted.
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Affiliation(s)
- J Leppälä
- Department of Neurosurgery, University of Helsinki, Finland
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Murakami M, Kuratsu J, Mihara Y, Matsuno K, Ushio Y. Histochemical study of alkaline phosphatase in primary human brain tumors: diagnostic implications for meningiomas and neurinomas. Neurosurgery 1993; 32:180-4; discussion 184. [PMID: 8382347 DOI: 10.1227/00006123-199302000-00005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Histochemical analysis of frozen, thin sections revealed the distribution of alkaline phosphatase (ALPase) in 47 primary intracranial neoplasms in humans. The cytoplasm of meningioma cells exhibited the strongest ALPase reactivity. Pretreatment of these materials by levamisol indicated that the isozymes of ALPase had the characteristic liver-bone-kidney form. In meningiomas and astrocytomas, there was no particular relationship between ALPase activity and malignancy. In neurinomas, there was weak ALPase reactivity in a few neoplastic cells. These findings are suggestive of diagnostic implications for fibroblastic meningiomas and neurinomas at the light microscopic level.
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Affiliation(s)
- M Murakami
- Department of Neurosurgery, Kumamoto University Medical School, Japan
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Abstract
Apolipoprotein (apo) E is a predominant protein in developing mammalian brain and in damaged peripheral nerve. Of particular interest is the observation that astrocytes in the central nervous system cease to produce apoE after nerve damage, whereas an increase in apoE production results after peripheral nerve injury. Differences in the response to injury with regard to the production of apoE may be related to dissimilarities in the abilities of the central and peripheral nervous systems to regenerate. As there are few data concerning the regulation of apoE gene expression in extrahepatic tissues, we employed a human astrocytoma cell line (CCF-STTG1) as a model to study apoE production in astrocytes. CCF-STTG1 cells secreted apoE constitutively in serum-free media. Cholesterol added to the media as cholesterol:phospholipid liposomes (2-100 micrograms/ml) or as human plasma LDL increased the amount of apoE secreted into the media, but had little or no effect on the relative abundance of apoE mRNA. By contrast, the commercially available triglyceride-phospholipid emulsion Intralipid added at dilutions of 1:50 to 1:500 caused a total inhibition of apoE secretion by the cells, but again, little change was noted in the relative abundance of apoE mRNA. Insulin (5 micrograms/ml) caused a 45-55% reduction in the amount of apoE secreted by the astrocytoma cells. Glucagon (5 micrograms/ml), on the other hand, did not increase apoE secretion, and apoE mRNA concentrations were not affected by either hormone treatment. ApoE was secreted from the astrocytoma cells associated with particles of plasma VLDL to IDL and HDL size. After feeding the cells with 20 micrograms/ml cholesterol as cholesterol:phospholipid liposomes, an increased proportion of apoE was secreted associated with the larger VLDL to IDL size particles, with a concomitant decrease in the proportion associated with the smaller HDL-size particles. When cells were incubated with 5 micrograms/ml insulin, most of the apoE was associated with the HDL-size particles. When cholesterol:phospholipid liposomes were added in the presence of insulin virtually all of the secreted apoE was found associated with the VLDL to IDL size particles. In summary, the regulation of apoE production in CCF-STTG1 cells in many respects resembles that of other cells, including hepatocytes. However, it is clear that there remain to be identified cell specific factors which regulate apoE production in astrocytes. The CCF-STTG1 cell line promises to provide a suitable model to investigate these questions.
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Affiliation(s)
- E S Krul
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
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