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Nix JS, Yuan M, Imada EL, Ames H, Marchionni L, Gutmann DH, Rodriguez FJ. Global microRNA profiling identified miR-10b-5p as a regulator of neurofibromatosis 1 (NF1)-glioma migration. Neuropathol Appl Neurobiol 2020; 47:96-107. [PMID: 32603552 DOI: 10.1111/nan.12641] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 06/14/2020] [Accepted: 06/30/2020] [Indexed: 01/12/2023]
Abstract
AIMS Neurofibromatosis 1 (NF1) is an autosomal-dominant cancer predisposition syndrome caused by loss of function alterations involving the NF1 locus on chromosome 17. The most common brain tumours encountered in affected patients are low-grade gliomas (pilocytic astrocytomas), although high-grade gliomas are also observed at increased frequency. While bi-allelic NF1 loss characterizes these tumours, previous studies have suggested noncoding RNA molecules (microRNA, miR) may have important roles in dictating glioma biology. METHODS To explore the contributions of miRs in NF1-associated gliomas, we analysed five high-grade gliomas (NF1-HGG) and five PAs (NF1-PA) using global microRNA profiling with NanoString-based microarrays followed by functional experiments with glioma cell lines. RESULTS miR-10b-5p, miR-135b-5p, miR-196a-5p, miR-196b-5p, miR-1247-5p and miR-320a (adjusted P < 0.05) were increased> 3-fold in NF1-HGG relative to NF1-PA tumours. In addition, miR-378b and miR-1305 were decreased 6.8- and 6-fold, respectively, whereas miR-451a was increased 2.7-fold (adjusted P < 0.05) in NF1-PAs compared to non-neoplastic NF1 patient brain specimens (n = 2). As miR-10b-5p was the microRNA overexpressed the most in NF1-high-grade glioma compared to NF1-low-grade glioma (5.76 fold), we examined its levels in glioma cell lines. miR-10b-5p levels were highest in adult glioma cell lines and lowest in paediatric low-grade glioma lines (P = 0.02). miR-10b-5p knockdown resulted in decreased invasion in NF1-deficient LN229 high-grade glioma line, whereas its overexpression in the NF1-PA derived line (JHH-NF1-PA1) led to increased invasion. There was no change in cell growth (viability and proliferation). CONCLUSIONS These proof-of-concept experiments support a role for microRNA regulation in NF1-glioma biology.
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Affiliation(s)
- J S Nix
- Departments of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - M Yuan
- Departments of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - E L Imada
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - H Ames
- Department of Pathology, University of Maryland, Baltimore, MD, USA
| | - L Marchionni
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - D H Gutmann
- Department of Neurology, Washington University, St. Louis, Missouri, USA
| | - F J Rodriguez
- Departments of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Departments of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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2
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Chang EC, Zheng Z, Philip L, Burcu C, Lei J, Singh P, Anurag M, Chan D, Li JD, Du XP, Shafaee MN, Banks K, Sacker S, Song W, Nguyen T, Cao J, Chen X, Haricharan S, Kavuri M, Kim BJ, Zhang B, Gutmann DH, Lanman RB, Foulds C, Ellis M. Abstract GS2-02: Direct regulation of estrogen receptor-α (ER) transcriptional activity by NF1. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-gs2-02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Inactivating germline mutations in the NF1 gene (encoding neurofibromin) cause neurofibromatosis type 1. In addition to peripheral nervous system tumors, NF1 patients are at higher risk for other cancers, including breast cancer. Tumor exome-sequencing studies demonstrate that approximately 20% of all human cancers have somatic NF1 mutations. NF1 has been best known for its ability to inactivate Ras as a GAP (GTPase Activating Protein). However, this function is served by a small GAP domain in a very large protein. Recurrent missense mutations inactivating the GAP activity are infrequent. In contrast, it is common to detect frameshift (FS) and nonsense (NS) NF1 mutations, which can create an NF1-null state deleting not only GAP, but also, potentially, undefined NF1 functions whose loss could also drive tumorigenesis.
As we reported at SABCS previously, in 600+ patients treated by tamoxifen adjuvant monotherapy, we found that FS/NS NF1 mutations independently correlate with relapse risk (HR=2.6, p=0.03). To explore this finding, we silenced NF1 in preclinical models of ER+ breast cancer, which markedly enhanced ER transcriptional activities, causing estradiol (E2) hypersensitivity and converted tamoxifen into an agonist (in vitro and in vivo). Most important, these activities depend on ER, but not on NF1's GAP activity. These findings readily explain the poor patient outcomes associated with NS/FS NF1 mutations, and reveal a previously unrecognized function for NF1 in ER regulation.
In the presence of an agonist, liganded ER repels co-repressors and recruits co-activators, while the reverse is true with an antagonist such as tamoxifen. Many co-regulators contain leucine/isoleucine rich motifs, which bind directly to the ligand-binding domain (LBD) in ER. NF1 has several of these motifs that are much more highly conserved in species with a functional ER pathway, and some of these are mutated in cancers (e.g., in our patient cohort). Furthermore, we found that NF1 canbind directly to ER, and that this binding is mediated between the ER LBD and the NF1 leucine-rich regions. Like a classic co-repressor, wildtype NF1 (but not mutants lacking GAP activity or the Leu-rich motif) binds to ER, and is recruited by ER to the ERE in the presence of tamoxifen, but not E2.
Further preclinical treatment studies indicate that while NF1-deficient ER+ breast cancer should not be treated by tamoxifen or AIs, fulvestrant remains effective. Furthermore, when fulvestrant is combined with dabrafinib and trametinib to inhibit Ras effectors Raf and MEK, apoptosis is induced in vitro, and tumor regression is observed in vivo. In conclusion, we have demonstrated that NF1 is a dual negative regulator at the intersection of two potent oncogenic signaling pathways, Ras and ER, and that NF1-deficient ER+ breast cancer patients may be more effectively treated by co-targeting the Ras and ER signaling. These patients, up to 10% of those with advanced ER+ breast cancer, can be readily identified for treatment by ctDNA analysis. A clinical trial is under development.
Citation Format: Chang EC, Zheng Z, Philip L, Burcu C, Lei J, Singh P, Anurag M, Chan D, Li JD, Du XP, Shafaee MN, Banks K, Sacker S, Song W, Nguyen T, Cao J, Chen X, Haricharan S, Kavuri M, Kim B-J, Zhang B, Gutmann DH, Lanman RB, Foulds C, Ellis M. Direct regulation of estrogen receptor-α (ER) transcriptional activity by NF1 [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr GS2-02.
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Affiliation(s)
- EC Chang
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - Z Zheng
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - L Philip
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - C Burcu
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - J Lei
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - P Singh
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - M Anurag
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - D Chan
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - JD Li
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - XP Du
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - MN Shafaee
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - K Banks
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - S Sacker
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - W Song
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - T Nguyen
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - J Cao
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - X Chen
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - S Haricharan
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - M Kavuri
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - B-J Kim
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - B Zhang
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - DH Gutmann
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - RB Lanman
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - C Foulds
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
| | - M Ellis
- Baylor College of Medicine, Houston, TX; Guardant Health, Inc., Redwood City, CA; Washington University School of Medicine, St Louise, MO; The Academy of Medical Science of Zhengzhou University, Zhengzhou, Henan, China; Southwest Medical University, Luzhou, Sichuan, China
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Zheng ZY, Cakar B, Lavere P, Cao J, Yao J, Singh P, Lei JT, Toonen JA, Haricharan S, Anurag M, Shah K, Kavuri M, Chan DW, Chen X, Gutmann DH, Foulds CE, Ellis MJ, Chang EC. Abstract P1-08-01: Regulation of estrogen receptor-α by NF1. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p1-08-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background. Although great strides have been made in targeting the ER pathway for treating ER+ breast cancer, relapse and death is common and is closely linked to resistance to ER-targeting agents. As a result, the majority of deaths from breast cancer still come from ER+ tumors. To discover drivers for endocrine resistance, we have sequenced tumor DNAs from a cohort of >600 patients treated with 5-year tamoxifen (Tam) monotherapy with a median 10.4 years follow up. Our preliminary data show that the worst outcome mutations (Hazard Ratio of ∼3 for relapse) were mostly those of the Neurofibromatosis type 1 (NF1) gene (encoding Neurofibromin), with nonsense/frame shift mutations creating early stop codons.
Germline NF1mutations cause neurofibromatosis type 1, a common inherited disorder that predisposes individuals to both benign and malignant tumors of the nervous system, as well as an increased risk for breast cancer. Analysis of DNA sequencing data has also shown that the NF1 gene is mutated in a wide range of common cancers (e.g., melanoma, lymphoma, and cancers of the lung, breast, and colon). Thus, NF1-deficiency underlies the formation and/or progression of a large number of cancers, so that the development of therapies targeted to NF1-deficient malignancies would have broad impact.
These observations support the hypothesis that NF1 gene inactivation is associated with aggressive tumor behaviors, such as endocrine therapy resistance in breast cancer. The key focus of this study is to define how the NF1 protein neurofibromin, regulates endocrine therapy resistance. Although neurofibromin is best known as a negative regulator for Ras, our data show that it may have other functions.
Method. Our data suggest that many of the identified nonsense/frame shift create a NF1 null state; thus, we have used gene-silencing to recapitulate the effects of such NF1 mutations on the activities of ER+ breast cancer cells. NF1+ and NF1– ER+ breast cancer cells were grown in defined media to measure how estradiol (E2) and Tam impact their growth, transforming activities, and gene expression. The binding between neurofibromin and components of the ER transcriptional pathway was measured biochemically and using the mammalian two-hybrid system.
Results. Our data showed that NF1-silenced cells use Tam as an agonist and can grow with very little E2, and these activities are driven by enhanced recruitment of ER to the ERE, leading to efficient expression of many classic ER-responsive genes. Expressing the NF1-GAP domain does not restore normal responses to Tam and E2 in NF1-silenced cells, suggesting that neurofibromincan regulate ER activity in a Ras-independent manner. To investigate the possibility that neurofibromin can directly regulate ER, we found that it can bind ER; furthermore, neurofibromin was more strongly recruited to the ERE by Tam than by E2.
Conclusion. Our data support a model whereby neurofibromin acts like a co-repressor for ER. As such,NF1 loss may result in more aggressive tumor behaviors by activating, not only the Ras pathways, but also the ER transcriptional pathways. Simultaneous activation of two powerful oncogenic pathways by the loss of a single tumor suppressor may explain why neurofibromin is such a potent tumor suppressor lost in a wide range of cancers.
Citation Format: Zheng Z-Y, Cakar B, Lavere P, Cao J, Yao J, Singh P, Lei JT, Toonen JA, Haricharan S, Anurag M, Shah K, Kavuri M, Chan DW, Chen X, Gutmann DH, Foulds CE, Ellis MJ, Chang EC. Regulation of estrogen receptor-α by NF1 [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P1-08-01.
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Affiliation(s)
- Z-Y Zheng
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - B Cakar
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - P Lavere
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - J Cao
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - J Yao
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - P Singh
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - JT Lei
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - JA Toonen
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - S Haricharan
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - M Anurag
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - K Shah
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - M Kavuri
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - DW Chan
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - X Chen
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - DH Gutmann
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - CE Foulds
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - MJ Ellis
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
| | - EC Chang
- Baylor College of Medicine, Houston, TX; Washington University in St. Louis, St. Louis, MO
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Omrani A, van der Vaart T, Mientjes E, van Woerden GM, Hojjati MR, Li KW, Gutmann DH, Levelt CN, Smit AB, Silva AJ, Kushner SA, Elgersma Y. HCN channels are a novel therapeutic target for cognitive dysfunction in Neurofibromatosis type 1. Mol Psychiatry 2015; 20:1311-21. [PMID: 25917366 PMCID: PMC5603719 DOI: 10.1038/mp.2015.48] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 02/19/2015] [Accepted: 03/09/2015] [Indexed: 12/27/2022]
Abstract
Cognitive impairments are a major clinical feature of the common neurogenetic disease neurofibromatosis type 1 (NF1). Previous studies have demonstrated that increased neuronal inhibition underlies the learning deficits in NF1, however, the molecular mechanism underlying this cell-type specificity has remained unknown. Here, we identify an interneuron-specific attenuation of hyperpolarization-activated cyclic nucleotide-gated (HCN) current as the cause for increased inhibition in Nf1 mutants. Mechanistically, we demonstrate that HCN1 is a novel NF1-interacting protein for which loss of NF1 results in a concomitant increase of interneuron excitability. Furthermore, the HCN channel agonist lamotrigine rescued the electrophysiological and cognitive deficits in two independent Nf1 mouse models, thereby establishing the importance of HCN channel dysfunction in NF1. Together, our results provide detailed mechanistic insights into the pathophysiology of NF1-associated cognitive defects, and identify a novel target for clinical drug development.
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Affiliation(s)
- A Omrani
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - T van der Vaart
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Pediatrics, Erasmus Medical Center, Sophia Children’s Hospital, Rotterdam, The Netherlands
| | - E Mientjes
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - GM van Woerden
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - MR Hojjati
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Physiology, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - KW Li
- Department of Molecular and Cellular Neurobiology, CNCR, Neuroscience Campus Amsterdam, VU University, Amsterdam, The Netherlands
| | - DH Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA
| | - CN Levelt
- Department of Molecular Visual Plasticity, Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, The Netherlands
| | - AB Smit
- Department of Molecular and Cellular Neurobiology, CNCR, Neuroscience Campus Amsterdam, VU University, Amsterdam, The Netherlands
| | - AJ Silva
- Department of Neurobiology, Brain Research Institute, University of California Los Angeles, Los Angeles, CA, USA
| | - SA Kushner
- ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands,Department of Psychiatry, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Y Elgersma
- Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands,ENCORE Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
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Johnson KJ, Fisher MJ, Listernick RL, North KN, Schorry EK, Viskochil D, Weinstein M, Rubin JB, Gutmann DH. Parent-of-origin in individuals with familial neurofibromatosis type 1 and optic pathway gliomas. Fam Cancer 2013; 11:653-6. [PMID: 22829012 DOI: 10.1007/s10689-012-9549-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Neurofibromatosis type 1 (NF1) is one of the most common autosomal dominant cancer syndromes worldwide. Individuals with NF1 have a wide variety of clinical features including a strongly increased risk for pediatric brain tumors. The etiology of pediatric brain tumor development in NF1 is largely unknown. Recent studies have highlighted the contribution of parent-of-origin effects to tumorigenesis in sporadic cancers and cancer predisposition syndromes; however, there is limited data on this effect for cancers arising in NF1. To increase our understanding of brain tumor development in NF1, we conducted a multi-center retrospective chart review of 240 individuals with familial NF1 who were diagnosed with a pediatric brain tumor (optic pathway glioma; OPG) to determine whether a parent-of-origin effect exists overall or by the patient's sex. Overall, 50 % of individuals with familial NF1 and an OPG inherited the NF1 gene from their mother. Similarly, by sex, both males and females were as likely to inherit the NF1 gene from their mother as from their father, with 52 % and 48 % of females and males with OPGs inheriting the NF1 gene from their mother. In conclusion, in contrast to findings from other studies of sporadic cancers and cancer predisposition syndromes, our results indicate no parent-of-origin effect overall or by patient sex for OPGs in NF1.
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Affiliation(s)
- K J Johnson
- Brown School, Washington University in St. Louis, MO 63130, USA.
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Solga AC, Gianino SM, Gutmann DH. NG2-cells are not the cell of origin for murine neurofibromatosis-1 (Nf1) optic glioma. Oncogene 2013; 33:289-99. [PMID: 23318450 DOI: 10.1038/onc.2012.580] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 10/26/2012] [Accepted: 10/26/2012] [Indexed: 01/19/2023]
Abstract
Low-grade glial neoplasms (astrocytomas) represent one of the most common brain tumors in the pediatric population. These tumors frequently form in the optic pathway (optic pathway gliomas, OPGs), especially in children with the neurofibromatosis type 1 (NF1)-inherited tumor predisposition syndrome. To model these tumors in mice, we have previously developed several Nf1 genetically-engineered mouse strains that form optic gliomas. However, there are three distinct macroglial cell populations in the optic nerve (astrocytes, NG2+ (nerve/glial antigen 2) cells and oligodendrocytes). The presence of NG2+ cells in the optic nerve raises the intriguing possibility that these cells could be the tumor-initiating cells, as has been suggested for adult glioma. In this report, we used a combination of complementary in vitro and novel genetically-engineered mouse strains in vivo to determine whether NG2+ cells could give rise to Nf1 optic glioma. First, we show that Nf1 inactivation results in a cell-autonomous increase in glial fibrillary acidic protein+ (GFAP+), but not in NG2+, cell proliferation in vitro. Second, similar to the GFAP-Cre transgenic strain that drives Nf1 optic gliomagenesis, NG2-expressing cells also give rise to all three macroglial lineages in vivo. Third, in contrast to the GFAP-Cre strain, Nf1 gene inactivation in NG2+ cells is not sufficient for optic gliomagenesis in vivo. Collectively, these data demonstrate that NG2+ cells are not the cell of origin for mouse optic glioma, and support a model in which gliomagenesis requires Nf1 loss in specific neuroglial progenitors during embryogenesis.
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Affiliation(s)
- A C Solga
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - S M Gianino
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - D H Gutmann
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
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Vogelbaum MA, Tong JX, Higashikubo R, Gutmann DH, Rich KM. Transfection of C6 glioma cells with the bax gene and increased sensitivity to treatment with cytosine arabinoside. Neurosurg Focus 2012; 3:Article3. [PMID: 17206779 DOI: 10.3171/foc.1997.3.5.6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Genes known to be involved in the regulation of apoptosis include members of the bcl-2 gene family, such as inhibitors of apoptosis (bcl-2 and bcl-xl) and promotors of apoptosis (bax). The authors investigated a potential approach for the treatment of malignant gliomas by using a gene transfection technique to manipulate the level of an intracellular protein involved in the control of apoptosis. The authors transfected the murine bax gene, which had been cloned into a mammalian expression vector, into the C6 rat glioma cell line. Overexpression of the bax gene resulted in a decreased growth rate (average doubling time of 32.96 hours compared with 22.49 hours for untransfected C6, and 23.11 hours for clones transfected with pcDNA3 only), which may be caused, in part, by an increased rate of spontaneous apoptosis (0.77 +/- 0.15% compared with 0.42 +/- 0.08% for the vector-only transfected C6 cell line; p = 0.038, two-tailed Student's t-test). Treatment with 1 microM of cytosine arabinoside (ara-C) resulted in significantly more cells undergoing apoptosis in the cell line overexpressing bax than in the vector-only control cell line (23.57 +/- 2.6% compared with 5.3 +/- 0.7% terminal deoxynucleotidyl transferase--mediated biotinylated--deoxyuridine triphosphate nick-end labeling technique-positive cells; p = 0.007). Furthermore, measurements of growth curves obtained immediately after treatment with 0.5 microM ara-C demonstrated a prolonged growth arrest of at least 6 days in the cell line overexpressing bax. These results can be used collectively to argue that overexpression of bax results in increased sensitivity of C6 cells to ara-C and that increasing bax expression may be a useful strategy, in general, for increasing the sensitivity of gliomas to antineoplastic treatments.
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Affiliation(s)
- M A Vogelbaum
- Department of Neurological Surgery and Neurology, and Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
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Kozono D, Nitta M, Sampetrean O, Kimberly N, Kushwaha D, Merzon D, Ligon K, Zhu S, Zhu K, Kim TH, Kwon CH, Becher O, Saya H, Chen CC, Donovan LK, Birks SM, Bosak V, Pilkington GJ, Mao P, Li J, Joshi K, Hu B, Cheng S, Sobol RW, Nakano I, Li M, Hale JS, Myers JT, Huang AY, Gladson C, Sloan AA, Rich JN, Lathia JD, Hall PE, Li M, Gallagher J, Hale JS, Wu Q, Venere M, Levy E, Rani MS, Huang P, Bae E, Selfridge J, Cheng L, Guvenc H, McLendon RE, Nakano I, Sloan AE, Phillips H, Lai A, Gladson C, Bredel M, Bao S, Hjelmeland A, Lathia JD, Rich JN, Hale JS, Li M, Sinyuk M, Rich JN, Lathia JD, Lathia JD, Li M, Sathyan P, Hale J, Zinn P, Gallagher J, Wu Q, Carson CT, Naik U, Hjelmeland A, Majumder S, Rich JN, Venere M, Wu Q, Song LA, Vasanji A, Tenley N, Hjelmeland AB, Rich JN, Peruzzi P, Bronisz A, Antonio Chiocca E, Godlewski JA, Guryanova OA, Wu Q, Fang X, Rich JN, Bao S, Christel HMC, Benito C, Zoltan G, Aline B, Tilman S, Josephine B, Carolin M, Thomas S, Violaine G, Unterberg A, Capilla-Gonzalez V, Guerrero-Cazares H, Cebrian-Silla A, Garcia-Verdugo JM, Quinones-Hinojosa A, Man J, Shoemake J, Venere M, Rich J, Yu J, He X, DiMeco F, Vescovi AL, Heth JA, Muraszko KM, Fan X, Nguyen SA, Stechishin OD, Luchman HA, Kelly JJ, Cairncross JG, Weiss S, Kim Y, Kim E, Wu Q, Guryanova OO, Hitomi M, Lathia J, Serwanski D, Sloan AE, Robert J, Lee J, Nishiyama A, Bao S, Hjelmeland AB, Rich JN, Liu JK, Wu Q, Hjelmeland AB, Rich JN, Flavahan WA, Kim Y, Li M, Lathia J, Rich J, Hjelmeland A, Fernandez N, Wu M, Bredel M, Das S, Bazzoli E, Pulvirenti T, Oberstadt MC, Perna F, Boyoung W, Schultz N, Huse JT, Fomchenko EI, Voza F, Tabar V, Brennan CW, DeAngelis LM, Nimer SD, Holland EC, Squatrito M, Chen YH, Gutmann DH, Kim SH, Lee MK, Chwae YJ, Yoo BC, Kim KH, Soeda A, Hara A, Iwama T, Park DM, Golebiewska A, Bougnaud S, Stieber D, Brons NH, Vallar L, Hertel F, Bjerkvig R, Niclou SP, Hamerlik P, Lathia JD, Rasmussen R, Fricova D, Rich JN, Jiri B, Schulte A, Kathagen A, Zapf S, Meissner H, Phillips HS, Westphal M, Lamszus K, Sanzey M, Golebiewska A, Stieber D, Niclou SP, Singh SK, Vartanian A, Gumin J, Sulman EP, Lang FF, Zadeh G, Bayin NS, Dietrich A, Abel T, Chao MV, Song HR, Buchholz CJ, Placantonakis D, Esencay M, Zagzag D, Balyasnikova IV, Prasol MS, Ferguson SD, Ahmed AU, Han Y, Lesniak MS, Barish ME, Brown CE, Herrmann K, Argalian S, Gutova M, Tang Y, Annala A, Moats RA, Ghoda LY, Aboody KS, Hitomi M, Gallagher J, Gadani S, Li M, Adkins J, Vsanji A, Wu Q, Soeda A, McLendon R, Chenn A, Hjelmeland A, Park D, Lathia J, Rich J, Dictus C, Friauf S, Valous NA, Grabe N, Muerle B, Unterberg AW, Herold-Mende CC, Lee HK, Finniss S, Buchris E, Ziv-Av A, Casacu S, Xiang C, Bobbit K, Rempel SA, Mikkelsen T, Slavin S, Brodie C, Kim E, Woo DH, Oh Y, Kim M, Nam DH, Lee J, Li Q, Salas S, Pendleton C, Wijesekera O, Chesler D, Wang J, Smith C, Guerrero-Cazares H, Levchenko A, Quinones-Hinojosa A, LaPlant Q, Pitter K, Bleau AM, Helmy K, Werbeck J, Barrett L, Shimizu F, Benezra R, Tabar V, Holland E, Chu Q, Bar E, Orr B, Eberhart CG, Schmid RS, Bash RE, Werneke AM, White KK, Miller CR, Agasse F, Jhaveri N, Hofman FM, Chen TC, Natsume A, Wakabayashi T, Kondo Y, Woo DH, Kim E, Chang N, Nam DH, Lee J, Moon E, Kanai R, Yip S, Kimura A, Tanaka S, Rheinbay E, Cahill D, Curry W, Mohapatra G, Iafrate J, Chi A, Martuza R, Rabkin S, Wakimoto H, Cusulin C, Luchman HA, Weiss S, Gutova M, Frank JA, Annala AJ, Barish ME, Moats RA, Aboody KS. LAB-STEM CELLS. Neuro Oncol 2012. [DOI: 10.1093/neuonc/nos239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Thangarajh M, Gutmann DH. Review: low-grade gliomas as neurodevelopmental disorders: insights from mouse models of neurofibromatosis-1. Neuropathol Appl Neurobiol 2012; 38:241-53. [PMID: 22035280 DOI: 10.1111/j.1365-2990.2011.01230.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Over the past few years, the traditional view of brain tumorigenesis has been revolutionized by advances in genomic medicine, molecular biology, stem cell biology and genetically engineered small-animal modelling. We now appreciate that paediatric brain tumours arise following specific genetic mutations in specialized groups of progenitor cells in concert with permissive changes in the local tumour microenvironment. This interplay between preneoplastic/neoplastic cells and non-neoplastic stromal cells is nicely illustrated by the neurofibromatosis type 1-inherited cancer syndrome, in which affected children develop low-grade astrocytic gliomas. In this review, we will use neurofibromatosis type 1 as a model system to highlight the critical role of growth control pathways, non-neoplastic cellular elements and brain region-specific properties in the development of childhood gliomas. The insights derived from examining each of these contributing factors will be instructive in the design of new therapies for gliomas in the paediatric population.
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Affiliation(s)
- M Thangarajh
- Department of Neurology, School of Medicine, Washington University, Saint Louis, MO, USA
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Shih CS, Ekoma S, Ho C, Pradhan K, Hwang E, Jakacki R, Fisher M, Kilburn L, Horn M, Vezina G, Rood B, Packer R, Mittal R, Omar S, Khalifa N, Bedir R, Avery R, Hwang E, Acosta M, Hutcheson K, Santos D, Zand D, Kilburn L, Rosenbaum K, Rood B, Packer R, Kalin-Hajdu E, Ospina L, Carret AS, Marzouki M, Decarie JC, Freeman E, Hershon L, Warmuth-Metz M, Zurakowski D, Bison B, Falkenstein F, Gnekow A, Ehrstedt C, Laurencikas E, Bjorklund AC, Stromberg B, Hedborg F, Pfeifer S, Bertin D, Packer RJ, Vallero S, Basso ME, Romano E, Peretta P, Morra I, D'Alonzo G, Fagioli F, Toledano H, Laviv Y, Dratviman-Storobinsky O, Michowiz S, Yaniv I, Cohen IJ, Goldenberg-Cohen N, Muller K, Gnekow A, Warmuth-Metz M, Pietsch T, Zwiener I, Falkenstein F, Meyer FM, Micke O, Hoffmann W, Kortmann RD, Shofty B, Ben-Sira L, Roth J, Constantini S, Shofty B, Weizmann L, Joskowicz L, Kesler A, Ben-Bashat D, Yalon M, Dvir R, Freedman S, Roth J, Ben-Sira L, Constantini S, Bandopadhayay P, Dagi L, Robison N, Goumnerova L, Ullrich N, Opocher E, De Salvo GL, De Paoli A, Simmons I, Sehested A, Walker DA, Picton SV, Gnekow A, Grill J, Driever PH, Azizi AA, Viscardi E, Perilongo G, Cappellano AM, Bouffet E, Silva F, Paiva P, Cavalheiro S, Seixas MT, Silva NS, Antony R, Fraser K, Lin J, Falkenstein F, Kwiecien R, Mirow C, Thieme B, von Hornstein S, Pietsch T, Faldum A, Warmuth-Metz M, Kortmann RD, Gnekow AK, Shofty B, Bokshtein F, Kesler A, Ben-Sira L, Freedman S, Constantini S, Panandiker AP, Klimo P, Thompson C, Armstrong G, Kun L, Boop F, Sanford A, Orge F, Laschinger K, Gold D, Bangert B, Stearns D, Cappellano AM, Senerchia A, Paiva P, Cavalheiro S, Silva F, Silva NS, Gnekow AK, Falkenstein F, Walker D, Perilongo G, Picton S, Grill J, Kortmann RD, Stokland T, van Meeteren AS, Slavc I, Faldum A, de Salvo GL, Fernandez KS, Antony R, Lulla RR, Flores M, Benavides VC, Mitchell C, AlKofide A, Hassonah M, Khafagh Y, Ayas MA, AlFawaz I, Anas M, Barria M, Siddiqui K, Al-Shail E, Fisher MJ, Ullrich NJ, Ferner RE, Gutmann DH, Listernick R, Packer RJ, Tabori U, Hoffman RO, Ardern-Holmes SL, Hummel TR, Hargrave DR, Charrow J, Loguidice M, Balcer LJ, Liu GT, Fisher MJ, Listernick R, Gutmann DH, Ferner RE, Packer RJ, Ullrich NJ, Tabori U, Hoffman RO, Ardern-Holmes SL, Hummel TR, Hargrave DR, Loguidice M, Balcer LJ, Liu GT, Jeeva I, Nelson O, Guy D, Damani A, Gogi D, Picton S, Simmons I, Jeeva I, Picton S, Guy D, Nelson O, Dewsbery S, Gogi D, Simmons I, Sievert AJ, Lang SS, Boucher K, Slaunwhite E, Brewington D, Madsen P, Storm PB, Resnick AC, Hemenway M, Madden J, Macy M, Foreman N, Rush S, Mascelli S, Raso A, Barla A, Nozza P, Biassoni R, Pignatelli S, Cama A, Verri A, Capra V, Garre M, Bergthold G, Piette C, Raquin MA, Dufour C, Varlet P, Dhermain F, Puget S, Sainte-Rose C, Abely M, Canale S, Grill J, Terashima K, Chow K, Jones J, Ahern C, Jo E, Ellezam B, Paulino A, Okcu MF, Su J, Adesina A, Mahajan A, Dauser R, Whitehead W, Lau C, Chintagumpala M, Kebudi R, Tuncer S, Cakir FB, Gorgun O, Agaoglu FY, Ayan I, Darendeliler E, Wolf D, Cohen K, Jeyapalan JN, Morley ICF, Hill AA, Tatevossian RG, Qaddoumi I, Ellison DW, Sheer D, Donson A, Barton V, Birks D, Kleinschmidt-DeMasters BK, Hemenway M, Handler M, Foreman N, Rush S, Tatevossian R, Qaddoumi I, Tang B, Dalton J, Shurtleff S, Punchihewa C, Orisme W, Neale G, Gajjar A, Baker S, Sheer D, Ellison D, Gilheeney S, Jamzadeh A, Winchester M, Yataghene K, De Braganca K, Khakoo Y, Lyden D, Dunkel I, Terasaki M, Eto T, Morioka M, Ho CY, Bar E, Giannini C, Karajannis MA, Zagzag D, Eberhart CG, Rodriguez FJ, Lee Y, Bartels U, Tabori U, Huang A, Bouffet E, Zaky W, Bluml S, Grimm J, Wong K, McComb G, Gilles F, Finlay J, Dhall G, Chen HH, Chen YW, Chang FC, Lin SC, Chang KP, Ho DM, Wong TT, Lee CC, Azizi AA, Fox R, Grill J, Mirow C, Gnekow A, Walker D, Perilongo G, Opocher E, Wheatley K, van Meeteren AYS, Phuakpet K, Tabori U, Bartels U, Huang A, Kulkarni A, Laperriere N, Bouffet E, Epari S, Nair V, Gupta T, Patil P, Moiyadi A, Shetty P, Kane S, Jalali R, Dorris K, Nadi M, Sutton M, Wang L, Stogner K, Li D, Hurwitz B, Stevenson C, Miles L, Kim MO, Fuller C, Hawkins C, Bouffet E, Jones B, Drake J, Fouladi M, Fontebasso AM, Shirinian M, Jones DTW, Quang DAK, Jacob K, Cin H, Witt H, Gerges N, Montpetit A, Brunet S, Lepage P, Klekner A, Lambert S, Kwan T, Hawkins C, Tabori U, Collins VP, Albrecht S, Pfister SM, Jabado N, Arrington D, Manley P, Kieran M, Chi S, Robison N, Chordas C, Ullrich N. LOW GRADE GLIOMAS. Neuro Oncol 2012; 14:i69-i81. [PMCID: PMC3483338 DOI: 10.1093/neuonc/nos092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023] Open
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Kim JH, Song HB, Kim DH, Park KD, Kim JH, Kim JH, Lee BJ, Kim DH, Kim JH, Khatua S, Kalkan E, Brown R, Pearlman M, Vats T, Abela L, Fiaschetti G, Shalaby T, Grunder E, Ma M, Grahlert J, Baumgartner M, Siler U, Nonoguchi N, Ohgaki H, Grotzer M, Adachi JI, Suzuki T, Fukuoka K, Yanagisawa T, Mishima K, Koga T, Matsutani M, Nishikawa R, Sardi I, Giunti L, Bresci C, Cardellicchio S, Da Ros M, Buccoliero AM, Farina S, Arico M, Genitori L, Massimino M, Filippi L, Erdreich-Epstein A, Zhou H, Ren X, Schur M, Davidson TB, Ji L, Sposto R, Asgharzadeh S, Tong Y, White E, Murugesan M, Nimmervoll B, Wang M, Marino D, Ellison D, Finkelstein D, Pounds S, Malkin D, Gilbertson R, Eden C, Ju B, Murugesan M, Phoenix T, Poppleton H, Lessman C, Taylor M, Gilbertson R, Sardi I, la Marca G, Cardellicchio S, Da Ros M, Malvagia S, Giunti L, Fratoni V, Farina S, Arico M, Genitori L, Massimino M, Giovannini MG, Giangaspero F, Badiali M, Gleize V, Paris S, Moi L, Elhouadani S, Arcella A, Morace R, Antonelli M, Buttarelli F, Mokhtari K, Sanson M, Smith S, Ward J, Wilson M, Rahman C, Rose F, Peet A, Macarthur D, Grundy R, Rahman R, Venkatraman S, Birks D, Balakrishnan I, Alimova I, Harris P, Patel P, Foreman N, Vibhakar R, Wu H, Zhou Q, Wang D, Wang G, Dang D, Pencreach E, Nguyen A, Guerin E, Lasthaus C, Guenot D, Entz-Werle N, Unland R, Schlosser S, Farwick N, Plagemann T, Richter G, Juergens H, Fruehwald M, Chien CL, Lee YH, Lin CI, Hsieh JY, Lin SC, Wong TT, Ho DMT, Wang HW, Lagah S, Tan IL, Malcolm S, Grundy R, Rahman R, Majani Y, Smith S, Grundy R, Rahman R, van Vuurden DG, Aronica E, Wedekind LE, Hulleman E, Biesmans D, Bugiani M, Vandertop WP, Kaspers GJL, Wurdinger T, Noske DP, Van der Stoop PM, van Vuurden DG, Shukla S, Wedekind LE, Kuipers GK, Hulleman E, Noske DP, Wurdinger T, Vandertop WP, Slotman BJ, Kaspers GJL, Cloos J, Sun T, Warrington N, Luo J, Ganzhorn S, Tabori U, Druley T, Gutmann D, Rubin J, Castelo-Branco P, Choufani S, Mack S, Galagher D, Zhang C, Lipman T, Zhukova N, Martin D, Merino D, Wasserman J, Samuel C, Alon N, Hitzler J, Wang JCY, Malkin D, Keller G, Dirks PB, Pfister S, Taylor MD, Weksberg R, Tabori U, Leblond P, Meignan S, Dewitte A, Le Tinier F, Wattez N, Lartigau E, Lansiaux A, Hanson R, Gordon I, Zhao S, Camphausen K, Warren K, Warrington NM, Sun T, Gutmann DH, Rubin JB, Nguyen A, Lasthaus C, Jaillet M, Pencreach E, Guerin E, Guenot D, Entz-Werle N, Kovacs Z, Martin-Fiori E, Shalaby T, Grotzer M, Bernasconi M, Werner B, Dyberg C, Baryawno N, Milosevic J, Wickstrom M, Northcott PA, Taylor MD, Kool M, Kogner P, Johnsen JI, Wilson M, Reynolds G, Davies N, Arvanitis T, Peet A, Zoghbi A, Meisterernst M, Fruehwald MC, Kerl K, Orr B, Haffner M, Nelson W, Yegnasubramanian S, Eberhart C, Fotovati A, Abu-Ali S, Wang PS, Deleyrolle L, Lee C, Triscott J, Chen J, Franciosi S, Nakamura Y, Sugita Y, Uchiumi T, Kuwano M, Leavitt B, Singh S, Jury A, Jones C, Wakimoto H, Reynolds B, Pallen C, Dunn S, Fletcher S, Levine J, Li M, Kagawa N, Hirayama R, Chiba Y, Kijima N, Arita H, Kinoshita M, Hashimoto N, Izumoto S, Maruno M, Yoshimine T. BIOLOGY. Neuro Oncol 2012; 14:i7-i15. [PMCID: PMC3483341 DOI: 10.1093/neuonc/nos095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023] Open
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Keir ST, Reardon DA, Friedman HS, Bigner DD, Lee DY, Kaul A, Pong WW, Gianino SM, White CR, Emnett RJ, Gutmann DH, Robinson JP, VanBrocklin M, Jydstrup-McKinney A, Saxena L, Holmen SL, Price RL, Song J, Bingmer K, Zimmerman P, Rivera A, Oglesbee M, Yi JY, Kaur B, Cook C, Kwon CH, Chiocca EA, Hu Y, Chaturbedi A, Nelson J, Linskey ME, Zhou YH, Sarabia-Estrada R, Molina CA, Jimenez-Estrada I, Gokaslan ZL, Witham TF, Wolinsky JP, Bydon A, Sciubba DM, Luchman A, Stechishin O, Weljie A, Blough M, Kelly J, Nguyen S, Hassam R, Livingstone D, Cseh O, Hoc HD, Cairncross JG, Weiss S, Monje M, Mitra SS, Freret ME, Edwards MS, Weissman IL, Beachy PA, Ozawa T, Charles NA, Huse JT, Helmy K, Squatrito M, Holland EC, Kennedy BC, Sonabend A, Lei L, Guarnieri P, Leung R, Soderquist C, Yun J, Bruce J, Canoll P, Castelli M, Lei L, Sonabend A, Kennedy B, Guarnieri P, Rosenfeld S, Bruce J, Canoll P, Balvers RK, Kloezeman JJ, Heijsman D, Kremer A, French PJ, Dirven CM, Leenstra S, Lamfers ML, Lazovic J, Soto H, Piccioni D, Chou A, Li S, Prins R, Liau L, Cloughesy T, Lai A, Pope W, Johns TG, Day B, Wilding A, Stringer B, Boyd AW, Li P, Mcellin B, Maddie M, Wohlfeld B, Kernie S, Kim R, Maher EA, Bachoo R. TUMOR MODELS (IN VIVO/IN VITRO). Neuro Oncol 2011. [DOI: 10.1093/neuonc/nor165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Moriera F, So K, Gould P, Kamnasaran D, Jensen RL, Hussain I, Gutmann DH, Gorovets D, Kastenhuber ER, Pentsova E, Nayak L, Huse JT, van den Bent MJ, Gravendeel LA, Gorlia T, Kros JM, Wesseling P, Teepen J, Idbaih A, Sanson M, Smitt PAS, French PJ, Zhang W, Zhang J, Hoadley K, Carter B, Li S, Kang C, You Y, Jiang C, Song S, Jiang T, Chen C, Grimm C, Weiler M, Claus R, Weichenhan D, Hartmann C, Plass C, Weller M, Wick W, Jenkins RB, Sicotte H, Xiao Y, Fridley BL, Decker PA, Kosel ML, Kollmeyer TM, Fink SR, Rynearson AL, Rice T, McCoy LS, Smirnov I, Tehan T, Hansen HM, Patoka JS, Prados MD, Chang SM, Berger MS, Lachance DH, Wiencke JK, Wiemels JL, Wrensch MR, Gephart MH, Lee E, Kyriazopoulou-Panagiotopoulou S, Milenkovic L, Xun X, Hou Y, Kui W, Edwards M, Batzoglou S, Jun W, Scott M, Hobbs JE, Tipton J, Zhou T, Kelleher NL, Chandler JP, Schwarzenberg J, Czernin J, Cloughesy T, Ellingson B, Geist C, Phelps M, Chen W, Nakada M, Hayashi Y, Obuchi W, Ohtsuki S, Watanabe T, Ikeda C, Misaki K, Kita D, Hayashi Y, Uchiyama N, Terasaki T, Hamada JI, Hiddingh L, Tops B, Hulleman E, Kaspers GJL, Vandertop WP, Wesseling P, Noske DP, Wurdinger T, Jeuken JW, See AP, Hwang T, Shin D, Shin JH, Gao Y, Lim M, Hutterer M, Michael M, Gerold U, Karin S, Ingrid G, Florian D, Armin M, Eugen T, Eberhard G, Gunther S, Cook RW, Oelschlager K, Sevim H, Chung L, Wheeler HT, Baxter RC, McDonald KL, Chaturbedi A, Yu L, Zhou YH, Chaturbedi A, Wong A, Fatuyi R, Linskey ME, Zhou YH, Lavon I, Shahar T, Zrihan D, Granit A, Ram Z, Siegal T, Brat DJ, Cooper LA, Gutman DA, Chisolm CS, Appin C, Kong J, Kurc T, Van Meir EG, Saltz JH, Moreno CS, Abuhusain HJ, McDonald KL, Don AS, Nagarajan RP, Johnson BE, Olshen AB, Smirnov I, Xie M, Wang J, Sundaram V, Paris P, Wang T, Costello JF, Sijben AE, Boots-Sprenger SH, Boogaarts J, Rijntjes J, Geitenbeek JM, van der Palen J, Bernsen HJ, Wesseling P, Jeuken JW, Schnell O, Adam SA, Eigenbrod S, Kretzschmar HA, Tonn JC, Schuller U, Schwarzenberg J, Cloughesy T, Czernin J, Geist C, Phelps M, Chen W, Sperduto PW, Kased N, Roberge D, Xu Z, Shanley R, Luo X, Sneed PK, Chao ST, Weil RJ, Suh J, Bhatt A, Jensen AW, Brown PD, Shih HA, Kirkpatrick J, Gaspar LE, Fiveash JB, Chiang V, Knisely JP, Sperduto CM, Lin N, Mehta MP, Kwatra MM, Porter TM, Brown KE, Herndon JE, Bigner DD, Dahlrot RH, Kristensen BW, Hansen S, Sulman EP, Cahill DP, Wang M, Won M, Hegi ME, Mehta MP, Aldape KD, Gilbert MR, Sadr ES, Tessier A, Sadr MS, Alshami J, Sabau C, Del Maestro R, Neal ML, Rockne R, Trister AD, Swanson KR, Maleki S, Back M, Buckland M, Brazier D, McDonald K, Cook R, Parker N, Wheeler H, Jalbert L, Elkhaled A, Phillips JJ, Yoshihara HA, Parvataneni R, Srinivasan R, Bourne G, Chang SM, Cha S, Nelson SJ, Aldape KD, Gilbert M, Cahill D, Wang M, Won M, Hegi M, Colman H, Mehta M, Sulman E, Elkhaled A, Jalbert L, Constantin A, Phillips J, Yoshihara H, Srinivasan R, Bourne G, Chang SM, Cha S, Nelson S, Gunn S, Reveles XT, Tirtorahardjo B, Strecker MN, Fichtel L. -OMICS AND PROGNOSTIC MARKERS. Neuro Oncol 2011. [DOI: 10.1093/neuonc/nor167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Payton JE, Schmidt J, Yu J, Lusis EA, Watson MA, Gutmann DH. Genome-wide polymorphism analysis demonstrates a monoclonal origin of pilocytic astrocytoma. Neuropathol Appl Neurobiol 2011; 37:321-5. [DOI: 10.1111/j.1365-2990.2010.01109.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Zhan Y, Modi N, Stewart AM, Hieronimus RI, Liu J, Gutmann DH, Chadee DN. Regulation of mixed lineage kinase 3 is required for Neurofibromatosis-2-mediated growth suppression in human cancer. Oncogene 2011; 30:781-9. [PMID: 20890305 PMCID: PMC3017676 DOI: 10.1038/onc.2010.453] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [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: 05/18/2010] [Revised: 08/04/2010] [Accepted: 08/25/2010] [Indexed: 12/25/2022]
Abstract
The Neurofibromatosis-2 (NF2) tumor suppressor merlin negatively regulates cell proliferation in numerous cell types. We have previously shown that the NF2 protein (merlin/schwannomin) associates with mixed lineage kinase 3 (MLK3), a mitogen-activated protein kinase (MAPK) kinase kinase that is required for the proliferation of normal and neoplastic cells. In this study, we show that merlin inhibits MLK3 activity, as well as the activation of its downstream effectors, B-Raf, extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK). The ability of merlin to regulate MLK3 activity requires a direct association between MLK3 and residues in the C-terminal region of merlin. Merlin integrates Rho GTPase family signaling with MAPK activity by inhibiting the binding between MLK3 and its upstream activator, Cdc42. Furthermore, we demonstrate that MLK3 is required for merlin-mediated suppression of cell proliferation and invasion. Collectively, these results establish merlin as a potent inhibitor of MLK3, ERK and JNK activation in cancer, and provide a mechanistic link between deregulated MAPK and Rho GTPase signaling in NF2 growth control.
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Affiliation(s)
- Y Zhan
- Department of Biological Sciences, University of Toledo, Toledo, OH, USA
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16
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Abstract
Traditionally, cancer studies have primarily focused on mutations that activate growth or survival pathways in susceptible pre-neoplastic/neoplastic cells. However, recent research has revealed a critical role for non-neoplastic cells within the tumor microenvironment in the process of cancer formation and progression. In addition, the existence of regional and developmental variations in susceptible cell types and supportive microenvironments support a model of tumorigenesis in which the dynamic symbiotic relationship between neoplastic and non-neoplastic cell types dictate where and when cancers form and grow. In this review, we highlight advances in neurofibromatosis type 1 (NF1) genetically engineered mouse brain tumor (glioma) modeling to reveal how cellular and molecular heterogeneity in both the pre-neoplastic/neoplastic and non-neoplastic cellular compartments contribute to gliomagenesis and glioma growth.
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Affiliation(s)
- W W Pong
- Department of Neurology, Washington University School of Medicine, St Louis, MO 63110, USA
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17
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Jensen RL, Gilliespie D, Ajewung N, Faure R, Kamnasaran D, Ajewung N, Poirier D, Kamnasaran D, Tamura K, Wakimoto H, Rabkin SD, Martuza RL, Shah K, Hashizume R, Aoki Y, Serwer LP, Drummond D, Noble C, Park J, Bankiewicz K, James DC, Gupta N, Agerholm-Larsen B, Iversen HK, Jensen KS, Moller J, Ibsen P, Mahmood F, Gehl J, Corem E, Ram Z, Daniels D, Last D, Shneor R, Salomon S, Perlstein B, Margel S, Mardor Y, Charest G, Fortin D, Mathieu D, Sanche L, Paquette B, Li HF, Hashizume R, Aoki Y, Hariono S, Dasgupta T, Kim JS, Haas-Kogan D, Weiss WA, Gupta N, James CD, Waldman T, Nicolaides T, Ozawa T, Rao S, Sun H, Ng C, De La Torre J, Santos R, Prados M, James CD, Butowski N, Michaud K, Solomon DA, Li HF, Kim JS, Prados MD, Ozawa T, Waldman T, James CD, Pandya H, Gibo D, Debinski W, Vinchon-Petit S, Jarnet D, Jadaud E, Feuvret L, Garcion E, Menei P, Chen R, Yu JC, Liu C, Jaffer ZM, Chabala JC, Winssinger N, Rubenstein AE, Emdad L, Kothari H, Qadeer Z, Binello E, Germano I, Hirschberg H, Baek SK, Kwon YJ, Sun CH, Li SC, Madsen S, Debinski W, Liu T, Wang SW, Gibo DM, Fan QW, Cheng C, Hackett C, Feldman M, Houseman BT, Houseman BT, Nicolaides T, James CD, Haas-Kogan D, Oakes SA, Debnath J, Shokat KM, Weiss WA, Sai K, Chen F, Qiu Z, Mou Y, Zhang X, Yang Q, Chen Z, Patel TR, Zhou J, Piepmeier JM, Saltzman WM, Banerjee S, Kaul A, Gianino SM, Christians U, Gutmann DH, Wu J, Shen R, Puduvalli V, Koul D, Alfred Yung WK, Yun J, Sonabend A, Stuart M, Yanagihara T, Dashnaw S, Brown T, McCormick P, Romanov A, Sebastian M, Canoll P, Bruce JN, Piao L, Joshi K, Lee RJ, Nakano I, Madsen SJ, Chou CC, Blickenstaff JW, Sun CH, Zhou YH, Hirschberg H, Tome CML, Wykosky J, Palma E, Debinski W, Nduom E, Machaidze R, Kaluzova M, Wang Y, Nie S, Hadjipanayis C, Saito R, Nakamura T, Sonoda Y, Kumabe T, Tominaga T, Lun X, Zemp F, Zhou H, Stechishin O, Kelly JJ, Weiss S, Hamilton MG, Cairncross G, Rabinovich BA, Bell J, McFadden G, Senger DL, Forsyth PA, Kang P, Jane EP, Premkumar DR, Pollack IF, Yoo JY, Haseley A, Bratasz A, Powell K, Chiocca EA, Kaur B, Johns TG, Ferruzzi P, Mennillo F, De Rosa A, Rossi M, Giordano C, Magrini R, Benedetti G, Pericot GL, Magnoni L, Mori E, Thomas R, Tunici P, Bakker A, Yoo JY, Pradarelli J, Kaka A, Alvarez-Breckenridge C, Pan Q, Teknos T, Chiocca EA, Kaur B, Cen L, Ostrem JL, Schroeder MA, Mladek AC, Fink SR, Jenkins RB, Sarkaria JN, Madhankumar AB, Slagle-Webb B, Park A, Pang M, Klinger M, Harbaugh KS, Sheehan JM, Connor JR, Chen TC, Wang W, Hofman FM, Serwer LP, Michaud K, Drummond DC, Noble CO, Park JW, Ozawa T, James CD, Serwer LP, Noble CO, Michaud K, Drummond DC, Ozawa T, Zhou Y, Marks JD, Bankiewicz K, Park JW, James CD, Alonso MM, Gomez-Manzano C, Cortes-Santiago N, Roche FP, Fueyo J, Johannessen TCA, Grudic A, Tysnes BB, Nigro J, Bjerkvig R, Joshi AD, Parsons W, Velculescu VE, Riggins GJ, Bindra RS, Jasin M, Powell SN, Fu J, Koul D, Shen RJ, Colman H, Lang FF, Jensen MR, Alfred Yung WK, Friedman GK, Haas M, Cassady KA, Gillespie GY, Nguyen V, Murphy LT, Beauchamp AS, Hollingsworth CK, Debinski W, Mintz A, Pandya H, Garg S, Gibo D, Kridel S, Debinski W, Conrad CA, Madden T, Ji Y, Colman H, Priebe W, Seleverstov O, Purow BW, Grant GA, Wilson C, Campbell M, Humphries P, Li S, Li J, Johnson A, Bigner D, Dewhirst M, Sarkaria JN, Cen L, Pokorny JL, Mladek AC, Kitange GJ, Schroeder MA, Carlson BL, Suphangul M, Petro B, Mukhtar L, Baig MS, Villano J, Mahmud N, Keir ST, Reardon DA, Watson M, Shore GC, Bigner DD, Friedman HS, Keir ST, Gururangan S, Reardon DA, Bigner DD, Friedman HS. Pre-clinical Experimental Therapeutics and Pharmacology. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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18
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Ilhan A, Wagner L, Maj M, Woehrer A, Czech T, Heinzl H, Marosi C, Base W, Preusser M, Jeuken JW, Navis AC, Sijben A, Boots-Sprenger SH, Bleeker FE, Gijtenbeek JM, Wesseling P, Seyed Sadr E, Tessier A, Seyed Sadr M, Alshami J, Anan M, Sabau C, Del Maestro R, Agnihotri S, Gajadhar A, Wolf A, Mischel PM, Hawkins C, Guha A, Guan X, Chance MR, Barnholtz-Sloan JS, Larson JD, Rodriguez FJ, Demer AM, Sarver AL, Dubac A, Jenkins RB, Dupuy AJ, Copeland NG, Jenkins NA, Taylor MD, Largaespada DA, Lusis EA, Stuart JE, Scheck AC, Coons SW, Lal A, Perry A, Gutmann DH, Barnholtz-Sloan JS, Adams MD, Cohen M, Devine K, Wolinsky Y, Bambakidis N, Selman W, Miller R, Sloan AE, Suchorska B, Mehrkens JH, Eigenbrod S, Eroes CA, Tonn JC, Kretzschmar HA, Kreth FW, Buczkowicz P, Bartels U, Morrison A, Zarghooni M, Bouffet E, Hawkins C, Kollmeyer TM, Wrensch M, Decker PA, Xiao Y, Rynearson AL, Fink S, Kosel ML, Johnson DR, Lachance DH, Yang P, Fridley BL, Wiemels J, Wiencke J, Jenkins RB, Zhou YH, Hess KR, Yu L, Raj VR, Liu L, Alfred Yung WK, Hutchins LF, Linskey ME, Roldan G, Kachra R, McIntyre JB, Magliocco A, Easaw J, Hamilton M, Northcott PA, Van Meter T, Eberhart C, Weiss W, Rutka JT, Gupta N, Korshunov A, French P, Kros J, Michiels E, Kloosterhof N, Hauser P, Montange MF, Jouvet A, Bouffet E, Jung S, Kim SK, Wang KC, Cho BK, Di Rocco C, Massimi L, Leonard J, Scheurlen W, Pfister S, Robinson S, Yang SH, Yoo JY, Cho DG, Kim HK, Kim SW, Lee SW, Fink S, Kollmeyer T, Rynearson A, Decker P, Sicotte H, Yang P, Jenkins R, Lai A, Kharbanda S, Tran A, Pope W, Solis O, Peale F, Forrest W, Purjara K, Carrillo J, Pandita A, Ellingson B, Bowers C, Soriano R, Mohan S, Yong W, Aldape K, Mischel P, Liau L, Nghiemphu P, James CD, Prados M, Westphal M, Lamszus K, Cloughesy T, Phillips H, Thon N, Kreth S, Eigenbrod S, Lutz J, Ledderose C, Tonn JC, Kretzschmar H, Kreth FW, Mokhtari K, Ducray F, Kros JM, Gorlia T, Idbaih A, Marie Y, Taphoorn M, Wesseling P, Brandes AA, Hoang-Xuan K, Delattre JY, Van den Bent M, Sanson M, Lavon I, Shahar T, Granit A, Smith Y, Nossek E, Siegal T, Ram Z, Marko NF, Quackenbush J, Weil RJ, Ducray F, Criniere E, Idbaih A, Paris S, Marie Y, Carpentier C, Houillier C, Dieme M, Adam C, Hoang-Xuan K, Delattre JY, Duyckaerts C, Sanson M, Mokhtari K, Zinn PO, Kozono D, Kasper EM, Warnke PC, Chin L, Chen CC, Saito K, Mukasa A, Saito N, Stieber D, Lenkiewicz E, Evers L, Vallar L, Bjerkvig R, Barrett M, Niclou SP, Gorlia T, Brandes A, Stupp R, Rampling R, Fumoleau P, Dittrich C, Campone M, Twelves C, Raymond E, Lacombe D, van den Bent MJ, Potter N, Ashmore S, Karakoula K, Ward S, Suarez-Merino B, Luxsuwong M, Thomas DG, Darling J, Warr T, Gutman DA, Cooper L, Kong J, Chisolm C, Van Meir EG, Saltz JH, Moreno CS, Brat DJ, Brennan CW, Brat DJ, Aldape KD, Cohen M, Lehman NL, McLendon RE, Miller R, Schniederjan M, Vandenberg SR, Weaver K, Phillips S, Pierce L, Christensen B, Smith A, Zheng S, Koestler D, Houseman EA, Marsit CJ, Wiemels JL, Nelson HH, Karagas MR, Wrensch MR, Kelsey KT, Wiencke JK, Al-Nedawi K, Meehan B, Micallef J, Guha A, Rak J. -Omics and Prognostic Markers. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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19
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Kim KY, Ju WK, Hegedus B, Gutmann DH, Ellisman MH. Ultrastructural characterization of the optic pathway in a mouse model of neurofibromatosis-1 optic glioma. Neuroscience 2010; 170:178-88. [PMID: 20600672 DOI: 10.1016/j.neuroscience.2010.06.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 06/08/2010] [Accepted: 06/09/2010] [Indexed: 12/30/2022]
Abstract
The purpose of this study was to investigate the progression of changes in retinal ganglion cells and optic nerve glia in neurofibromatosis-1 (NF1) genetically-engineered mice with optic glioma. Optic glioma tumors were generated in Nf1+/- mice lacking Nf1 expression in GFAP+ cells (astrocytes). Standard immunohistochemistry methods were employed to identify astrocytes (GFAP, S100beta), proliferating progenitor cells (sox2, nestin), microglia (Iba1), endothelial cells (CD31) and retinal ganglion cell (RGC) axons (Neurofilament 68k) in Nf1+/-, Nf1(GFAP)CKO (wild-type mice with Nf1 loss in glial cells), and Nf1+/-(GFAP)CKO (Nf1+/- mice with Nf1 loss in glial cells) mice. Ultrastructural changes in the optic chiasm and nerve were assessed by electron microscopy (EM). RGC were counted in whole retina preparations using high-resolution, mosaic confocal microscopy following their delineation by retrograde FluoroGold labeling. We found that only Nf1+/-(GFAP)CKO mice exhibited gross pre-chiasmatic optic nerve and chiasm enlargements containing aggregated GFAP+/nestin+ and S100beta+/sox2+ cells (neoplastic glia) as well as increased numbers of blood vessels and microglia. Optic gliomas in Nf1+/-(GFAP)CKO mice contained axon fiber irregularities and multilamellar bodies of degenerated myelin. EM and EM tomographic analyses showed increased glial disorganization, disoriented axonal projections, profiles of degenerating myelin and structural alterations at nodes of Ranvier. Lastly, we found reduced RGC numbers in Nf1+/-(GFAP)CKO mice, supporting a model in which the combination of optic nerve Nf1 heterozygosity and glial cell Nf1 loss results in disrupted axonal-glial relationships, subsequently culminating in the degeneration of optic nerve axons and loss of their parent RGC neurons.
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Affiliation(s)
- K Y Kim
- Center for Research in Biological Systems, National Center for Microscopy and Imaging Research and Department of Neurosciences, University of California San Diego School of Medicine, La Jolla, CA 92037, USA
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Yu J, Deshmukh H, Gutmann RJ, Emnett RJ, Rodriguez FJ, Watson MA, Nagarajan R, Gutmann DH. Alterations of BRAF and HIPK2 loci predominate in sporadic pilocytic astrocytoma. Neurology 2009; 73:1526-31. [PMID: 19794125 DOI: 10.1212/wnl.0b013e3181c0664a] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
OBJECTIVE Independent studies have previously demonstrated that both the HIPK2 and BRAF genes are amplified and rearranged, respectively, in pilocytic astrocytomas (PAs). The purpose of this study was to further investigate the frequency of BRAF and HIPK2 alterations in PAs, the concordance of these events, and their relationship to clinical phenotype. METHODS We performed extensive characterization by array-based copy number assessment (aCGH), HIPK2 copy number analysis, and BRAF rearrangement and mutation analysis in a set of 79 PAs, including 9 tumors from patients with neurofibromatosis type 1 (NF1). RESULTS We identified 1 of 3 previously identified BRAF rearrangements in 42/70 sporadic PAs. An additional 2 tumors with no rearrangement also exhibited BRAF mutation, including a novel 3-base insertion. As predicted from the genomic organization at this locus, 22/36 tumors with BRAF rearrangement also exhibited corresponding HIPK2 amplification. However, 14/36 tumors with BRAF rearrangement had no detectable HIPK2 gene amplification and 6/20 tumors demonstrated HIPK2 amplification without apparent BRAF rearrangement or mutation. Only 12/70 PAs lacked detectable BRAF or HIPK2 alterations. Importantly, none of the 9 PA tumors from NF1 patients exhibited BRAF rearrangement or mutation. CONCLUSIONS BRAF rearrangement represents the most common genetic alteration in sporadic, but not neurofibromatosis type 1-associated, pilocytic astrocytomas (PAs). These findings implicate BRAF in the pathogenesis of these common low-grade astrocytomas in children, and suggest that PAs arise either from NF1 inactivation or BRAF gain of function.
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Affiliation(s)
- J Yu
- Department of Pathology, Washington University School of Medicine, Box 8111, 660 South Euclid Avenue, Saint Louis, MO 63110, USA
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21
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Dickinson PJ, Surace EI, Cambell M, Higgins RJ, Leutenegger CM, Bollen AW, Lecouteur RA, Gutmann DH. Expression of the Tumor Suppressor Genes NF2, 4.1B, and TSLC1 in Canine Meningiomas. Vet Pathol 2009; 46:884-92. [PMID: 19429976 DOI: 10.1354/vp.08-vp-0251-d-fl] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Meningiomas are common primary brain tumors in dogs; however, little is known about the molecular genetic mechanisms involved in their tumorigenesis. Several tumor suppressor genes have been implicated in meningioma pathogenesis in humans, including the neurofibromatosis 2 ( NF2), protein 4.1B ( 4.1 B), and tumor suppressor in lung cancer-1 ( TSLC1) genes. We investigated the expression of these tumor suppressor genes in a series of spontaneous canine meningiomas using quantitative real-time reverse transcription polymerase chain reaction (RT-PCR) ( NF2; n = 25) and western blotting (NF2/merlin, 4.1B, TSLC1; n = 30). Decreased expression of 4.1B and TSLC1 expression on western blotting was seen in 6/30 (20%) and in 15/30 (50%) tumors, respectively, with 18/30 (60%) of meningiomas having decreased or absent expression of one or both proteins. NF2 gene expression assessed by western blotting and RT-PCR varied considerably between individual tumors. Complete loss of NF2 protein on western blotting was not seen, unlike 4.1B and TSLC1. Incidence of TSLC1 abnormalities was similar to that seen in human meningiomas, while perturbation of NF2 and 4.1B appeared to be less common than reported for human tumors. No association was observed between tumor grade, subtype, or location and tumor suppressor gene expression based on western blot or RT-PCR. These results suggest that loss of these tumor suppressor genes is a frequent occurrence in canine meningiomas and may be an early event in tumorigenesis in some cases. In addition, it is likely that other, as yet unidentified, genes play an important role in canine meningioma formation and growth.
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Affiliation(s)
- P. J. Dickinson
- Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA
| | - E. I. Surace
- Department of Neurology, Washington University School of Medicine, St. Louis, MO
| | - M. Cambell
- Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA
| | - R. J. Higgins
- Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California Davis, Davis, CA
| | - C. M. Leutenegger
- Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA
| | - A. W. Bollen
- Department of Pathology, School of Medicine, University of California San Francisco, San Francisco, CA
| | - R. A. Lecouteur
- Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA
| | - D. H. Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO
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Filion C, Motoi T, Olshen AB, Laé M, Emnett RJ, Gutmann DH, Perry A, Ladanyi M, Labelle Y. The EWSR1/NR4A3 fusion protein of extraskeletal myxoid chondrosarcoma activates the PPARG nuclear receptor gene. J Pathol 2009; 217:83-93. [PMID: 18855877 DOI: 10.1002/path.2445] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The NR4A3 nuclear receptor is implicated in the development of extraskeletal myxoid chondrosarcoma (EMC), primitive sarcoma unrelated to conventional chondrosarcomas, through a specific fusion with EWSR1 resulting in an aberrant fusion protein that is thought to disrupt the transcriptional regulation of specific target genes. We performed an expression microarray analysis of EMC tumours expressing the EWSR1/NR4A3 fusion protein, comparing their expression profiles to those of other sarcoma types. We thereby identified a set of genes significantly overexpressed in EMC relative to other sarcomas, including PPARG and NDRG2. Western blot or immunohistochemical analyses confirm that PPARG and NDRG2 are expressed in tumours positive for EWSR1/NR4A3. Bioinformatic analysis identified a DNA response element for EWSR1/NR4A3 in the PPARG promoter, and band-shift experiments and transient transfections indicate that EWSR1/NR4A3 can activate transcription through this element. Western blots further show that an isoform of the native NR4A3 receptor lacking the C-terminal domain is very highly expressed in tumours positive for EWSR1/NR4A3, and co-transfections of this isoform along with EWSR1/NR4A3 indicate that it may negatively regulate the activity of the fusion protein on the PPARG promoter. These results suggest that the overall expression of PPARG in EMC may be regulated in part by the balance between EWSR1/NR4A3 and NR4A3, and that PPARG may play a crucial role in the development of these tumours. The specific up-regulation of PPARG by EWSR1/NR4A3 may also have potential therapeutic implications.
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Affiliation(s)
- C Filion
- Human and Molecular Genetic Research Unit, Saint-François d'Assise Hospital Research Center, CHUQ, Quebec, Qc, Canada
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Gutmann DH, Bajenaru ML, Hedrick N, Wu Y, Fink L, Zhu Y, Parada L. Astrocyte-specific neurofibromatosis 1 gene deletion is insufficient for astrocytoma formation in mice. J Neurochem 2008. [DOI: 10.1046/j.1471-4159.81.s1.48_4.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
Cervical cord compression from cervical root neurofibromas represents an important clinical problem in patients with neurofibromatosis type 1 (NF1), but is rarely reported. The aim of this study was to describe the clinical presentation and follow-up of children and adults with NF1 and cervical cord compression. A retrospective review of clinical records and neuroimaging studies from two large tertiary care centres between 1996 and 2006 was performed. 13 patients with NF1 and cervical cord compression were identified. Age at presentation ranged from 9 to 61 years. The most common presentation was progressive quadriparesis. 11 of 13 patients underwent cervical decompression and subtotal resection of the associated neurofibroma. The majority of patients had recovery of neurological function and no further clinical progression. Progressive neurological deficit (typically quadriparesis), rather than neuroimaging appearances, should dictate the need for surgery.
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Affiliation(s)
- J R Leonard
- Department of Neurosurgery, St Louis Children's Hospital and Washington University School of Medicine, St Louis, Missouri, USA
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25
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Sandsmark DK, Pelletier C, Weber JD, Gutmann DH. Mammalian target of rapamycin: master regulator of cell growth in the nervous system. Histol Histopathol 2007; 22:895-903. [PMID: 17503347 DOI: 10.14670/hh-22.895] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mammalian target of rapamycin (mTOR) is a highly conserved serine/threonine protein kinase that regulates a number of diverse biologic processes important for cell growth and proliferation, including ribosomal biogenesis and protein translation. In this regard, hyperactivation of the mTOR signaling pathway has been demonstrated in numerous human cancers, including a number of inherited cancer syndromes in which individuals have an increased risk of developing benign and malignant tumors. Three of these inherited cancer syndromes (Lhermitte-Duclos disease, neurofibromatosis type 1, and tuberous sclerosis complex) are characterized by significant central nervous system dysfunction and brain tumor formation. Each of these disorders is caused by a genetic mutation that disrupts the expression of proteins which negatively regulate mTOR signaling, indicating that the mTOR signaling pathway is critical for appropriate brain development and function. In this review, we discuss our current understanding of the mTOR signaling pathway and its role in promoting ribosome biogenesis and cell growth. We suggest that studies of this pathway may prove useful in identifying molecular targets for biologically-based therapies of brain tumors associated with these inherited cancer syndromes as well as sporadic central nervous system tumors.
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Affiliation(s)
- D K Sandsmark
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
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Abstract
Tumor suppressor in lung cancer-1 (TSLC1) loss is common in many human cancers, including meningioma. In this study, we demonstrate that TSLC1 protein and RNA expression is lost in 60% to 65% of high-grade gliomas, and that TSLC1 reintroduction into glioma cells results in growth suppression. Moreover, Tslc1 loss in mice results in increased astrocyte proliferation in vivo and in vitro. These data indicate that TSLC1 functions as a glioma tumor suppressor.
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Affiliation(s)
- S S Houshmandi
- Department of Neurology, Washington University School of Medicine, Box 8111; 660 S. Euclid Avenue, St. Louis, MO 63110, USA
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27
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Leonard JR, Perry A, Rubin JB, King AA, Chicoine MR, Gutmann DH. The role of surgical biopsy in the diagnosis of glioma in individuals with neurofibromatosis-1. Neurology 2006; 67:1509-12. [PMID: 17060590 DOI: 10.1212/01.wnl.0000240076.31298.47] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Most gliomas in neurofibromatosis type 1 (NF1) are pilocytic astrocytomas (PAs) of the optic pathway occurring in young children. However, some individuals develop gliomas that lack the typical NF1-associated clinical features or radiographic appearance. We identified 17 atypical presentations from a review of 100 patients with NF1-associated gliomas. Biopsy showed that 9 were not classic PAs. These data highlight the value of biopsy in NF1-associated gliomas with unusual clinical or radiographic presentations.
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Affiliation(s)
- J R Leonard
- Department of Neurology, St. Louis Children's Hospital and Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA
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Sharma MK, Watson MA, Lyman M, Perry A, Aldape KD, Deák F, Gutmann DH. Matrilin-2 expression distinguishes clinically relevant subsets of pilocytic astrocytoma. Neurology 2006; 66:127-30. [PMID: 16401863 DOI: 10.1212/01.wnl.0000188667.66646.1c] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Using whole genome expression microarray technology to discover clinically relevant biomarkers for pilocytic astrocytoma (PA), the authors identified matrilin-2 as a unique mRNA overexpressed in PA. Matrilin-2 protein expression was similarly elevated in the majority of sporadic PA, but in only one neurofibromatosis 1-associated PA with an unusually aggressive clinical phenotype. These results suggest that matrilin-2 may be a specific and clinically useful biomarker for discriminating between indolent and clinically aggressive PA.
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Affiliation(s)
- M K Sharma
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
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Mangoura D, Sun Y, Li C, Singh D, Gutmann DH, Flores A, Ahmed M, Vallianatos G. Phosphorylation of neurofibromin by PKC is a possible molecular switch in EGF receptor signaling in neural cells. Oncogene 2006; 25:735-45. [PMID: 16314845 DOI: 10.1038/sj.onc.1209113] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Children with neurofibromatosis (NF1) typically develop central nervous system (CNS) abnormalities, including aberrant proliferation of astrocytes and formation of benign astrocytomas. The NF1 gene encodes neurofibromin, a Ras-GAP, highly expressed in developing neural cells; the mechanism of regulation of neurofibromin as a Ras-GAP, remains however unknown. We now show that, in response to EGF, neurofibromin is in vivo phosphorylated on serine residues by PKC-alpha, in human, rat, and avian CNS cells and cell lines. EGF-induced PKC phosphorylation was prominent in the cysteine/serine-rich domain (CSRD) of neurofibromin, which lies in the N-terminus and upstream of the Ras-GAP domain (GRD), and this modification significantly increased the association of neurofibromin with actin in co-immunoprecipitations. In addition, we show that Ras activation in response to EGF was significantly lowered when C62B cells overexpressed a construct encoding both CSRD + GRD. Moreover, when PKC-alpha was downregulated, the Ras-GAP activity of CSRD + GRD was significantly diminished, whereas overexpressed GRD alone acted as a weaker GAP and in a PKC-independent manner. Most importantly, functional Ras inhibition and EGF signaling shifts were established at the single cell level in C6-derived cell lines stably overexpressing CSRD + GRD, when transient co-overexpression of Ras and PKC-depletion prior to stimulation with EGF-induced mitosis. Taken together, these data provide the first evidence of a functional, allosteric regulation of GRD by CSRD, which requires neurofibromin phosphorylation by PKC and association with the actin cytoskeleton. Our data may suggest a novel mechanism for regulating biological responses to EGF and provide a new aspect for the understanding of the aberrant proliferation seen in the CNS of children with NF1.
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Affiliation(s)
- D Mangoura
- Department of Pediatrics, The University of Chicago, Chicago, IL, USA. and Neurosciences Division, Institute for Biomedical Research, Athens, Greece
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Abstract
Identification of new optic pathway tumors (OPTs) and progression of pre-existing OPTs in children with neurofibromatosis 1 (NF1) have been reported infrequently after age 6. The authors present eight children with NF1 (mean age 12.2 years) seen in three NF1 centers who had either late-onset (four of eight) or late-progressive (seven of eight) OPT. Continued monitoring of individuals with NF1 into adulthood for the development of OPTs and for progression of known OPTs is warranted.
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Affiliation(s)
- R Listernick
- Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
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Chen Y, Gutmann DH, Haipek CA, Martinsen BJ, Bronner-Fraser M, Krull CE. Characterization of chicken Nf2/merlin indicates regulatory roles in cell proliferation and migration. Dev Dyn 2004; 229:541-54. [PMID: 14991710 DOI: 10.1002/dvdy.20002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [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] [Indexed: 11/07/2022] Open
Abstract
The neurofibromatosis 2 (NF2) tumor suppressor protein merlin, or schwannomin, functions as a negative growth regulator such that inactivating mutations in Nf2 predispose humans to tumors. In addition, merlin has a critical role during embryonic development. Nf2-deficient mice die early during embryogenesis, with defects in gastrulation and extraembryonic tissues. To investigate the function of Nf2/merlin during embryonic development, we first identified the homologous Nf2 gene in chicken (cNf2) and examined the distribution of chicken merlin (c-merlin) during myogenesis. cNf2 encoded a full-length mRNA of 1,770 nucleotides and a protein of 589 residues. C-merlin shared high sequence homology and common protein motifs with vertebrate and Drosophila merlins. In addition, cNF2 functions as a negative growth regulator similar to human and Drosophila merlin in vitro. In vivo, c-merlin was expressed diffusely in the forming dermomyotome but down-regulated in migratory muscle precursors in the forelimb. As muscle formed in the limb, c-merlin expression was up-regulated. As an initial examination of c-merlin function during myogenesis, c-merlin was ectopically expressed in muscle precursors and the effects on muscle development were examined. We show that ectopic merlin expression reduces the proliferation of muscle precursors as well as their ability to migrate effectively in limb mesoderm. Collectively, these results demonstrate that c-merlin is developmentally regulated in migrating and differentiating myogenic cells, where it functions as a negative regulator of both muscle growth and motility.
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Affiliation(s)
- Y Chen
- Division of Biological Sciences,University of Missouri-Colombia, Colombia, Missouri 65211, USA
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Gutmann DH, James CD, Poyhonen M, Louis DN, Ferner R, Guha A, Hariharan S, Viskochil D, Perry A. Molecular analysis of astrocytomas presenting after age 10 in individuals with NF1. Neurology 2003; 61:1397-400. [PMID: 14638962 DOI: 10.1212/wnl.61.10.1397] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Fifteen to 20% of children with neurofibromatosis type 1 (NF1) develop low-grade astrocytomas. Although brain tumors are less common in teenagers and adults with NF1, recent studies have suggested that patients with NF1 are at a significantly increased risk of developing astrocytomas. OBJECTIVE S: To investigate the genetic basis for astrocytoma development in patients with NF1 beyond the first decade of life. METHODS The authors performed molecular genetic analyses of 10 NF1-associated astrocytomas representing all World Health Organization (WHO) malignancy grades using fluorescence in situ hybridization, loss of heterozygosity, immunohistochemistry, and direct sequencing. RESULTS Later-onset NF1-associated astrocytomas, unlike histologically identical sporadic astrocytomas, exhibit NF1 inactivation, supporting a direct association with NF1 rather than a chance occurrence. Furthermore, some of these astrocytomas have homozygous NF1 deletion. In addition, genetic changes observed in high-grade sporadic astrocytomas, including TP53 mutation and CDKN2A/p16 deletion, are also seen in NF1-associated high-grade astrocytomas. CONCLUSIONS Neurofibromatosis type 1-associated astrocytomas occurring in patients older than 10 years exhibit genetic changes observed in sporadic high-grade astrocytomas. Patients with neurofibromatosis type 1 and germline NF1 deletions may be at risk for developing late-onset astrocytomas.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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33
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Gutmann DH, Winkeler E, Kabbarah O, Hedrick N, Dudley S, Goodfellow PJ, Liskay RM. Mlh1 deficiency accelerates myeloid leukemogenesis in neurofibromatosis 1 (Nf1) heterozygous mice. Oncogene 2003; 22:4581-5. [PMID: 12881715 DOI: 10.1038/sj.onc.1206768] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Defects in DNA mismatch repair (MMR) have been implicated in the genesis of a diverse set of human cancers. Recent studies have suggested that one of the targets of MMR is the neurofibromatosis 1 (NF1) gene. To evaluate the contribution of Mlh1 MMR deficiency to Nf1 tumorigenesis, Mlh1-/-;Nf1+/- mice were generated. All Mlh1-/-;Nf1+/- mice (n=21) were dead by 260 days compared to none of the Nf1+/- mice. In all, 50% of the Mlh1-/-;Nf1+/- mice were dead at 150 days compared to 252 days for Mlh1-/- mice. Nine of the Mlh1-/-;Nf1+/- mice were found to harbor intrathoracic NOS2-immunoreactive myeloid leukemias similar to the hematopoietic malignancies observed in older Nf1+/- mice. As expected, significant microsatellite instability was observed in six of six tumors and neurofibromin expression was lost in all tumors analysed. These results suggest that MMR deficiency can accelerate myeloid leukemogenesis in Nf1+/- mice, presumably by inactivating Nf1 gene expression.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, St Louis, MO 63110, USA.
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Gutmann DH, Rasmussen SA, Wolkenstein P, MacCollin MM, Guha A, Inskip PD, North KN, Poyhonen M, Birch PH, Friedman JM. Gliomas presenting after age 10 in individuals with neurofibromatosis type 1 (NF1). Neurology 2002; 59:759-61. [PMID: 12221173 DOI: 10.1212/wnl.59.5.759] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Children with neurofibromatosis 1 (NF1) often develop low-grade gliomas, but brain tumors are infrequently encountered in adults with NF1. The authors present evidence from two clinical series, one including patients known to have NF1 and another focusing on adults with new onset brain tumors, that suggests an association between NF1 and symptomatic gliomas in older individuals. They also summarize the clinical data on 17 adolescents or adults with NF1 and symptomatic gliomas. The findings suggest that individuals with NF1 are at increased risk of developing gliomas throughout their lives.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Baser ME, De Rienzo A, Altomare D, Balsara BR, Hedrick NM, Gutmann DH, Pitts LH, Jackler RK, Testa JR. Neurofibromatosis 2 and malignant mesothelioma. Neurology 2002; 59:290-1. [PMID: 12136076 DOI: 10.1212/wnl.59.2.290] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Mutations of the neurofibromatosis 2 (NF2) tumor suppressor gene cause the inherited disorder NF2 and are also common in malignant mesothelioma, which is not a characteristic feature of NF2. The authors report an asbestos-exposed person with NF2 and malignant mesothelioma. Immunohistochemical analysis of the mesothelioma confirmed loss of expression of the NF2 protein, and comparative genomic hybridization revealed losses of chromosomes 14, 15, and 22, and gain of 7. The authors propose that a person with a constitutional mutation of an NF2 allele is more susceptible to mesothelioma.
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Packer RJ, Gutmann DH, Rubenstein A, Viskochil D, Zimmerman RA, Vezina G, Small J, Korf B. Plexiform neurofibromas in NF1: toward biologic-based therapy. Neurology 2002; 58:1461-70. [PMID: 12041525 DOI: 10.1212/wnl.58.10.1461] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Neurofibromatosis type 1 (NF1) is one of the most common neurogenetic diseases affecting adults and children. Neurofibromas are one of the most common of the protean manifestations of NF1. Plexiform neurofibromas, which will frequently cause cosmetic abnormalities, pain, and neurologic deficits, are composed of "neoplastic" Schwann cells accompanied by other participating cellular and noncellular components. There is increasing evidence that loss of NF1 expression in neoplastic Schwann cells is associated with elevated levels of activated RAS, supporting the notion that the NF1 gene product, neurofibromin, acts as a growth regulator by inhibiting ras growth-promoting activity. In addition, there is increasing evidence that other cooperating events, which may be under cytokine modulation, are important for neurofibroma development and growth. Treatment of plexiform neurofibromas has been empiric, with surgery being the primary option for those with progressive lesions causing a major degree of morbidity. The efficacy of alternative treatment approaches, including the use of antihistamines, maturation agents, and antiangiogenic drugs, has been questionable. More recently, biologic-based therapeutic approaches, using drugs that target the molecular genetic underpinnings of plexiform neurofibromas or cytokines believed important in tumor growth, have been initiated. Evaluation of such trials is hindered by the unpredictable natural history of plexiform neurofibromas and difficulties in determining objective response in tumors that are notoriously large and irregular in shape. Innovative neuroimaging techniques and the incorporation of quality-of-life scales may be helpful in evaluation of therapeutic interventions. The ability to design more rational therapies for NF1-associated neurofibromas is heavily predicated on an improved understanding of the molecular and cellular biology of the cells involved in neurofibroma formation and growth.
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Affiliation(s)
- R J Packer
- Department of Neurology, Children's National Medical Center, George Washington University, Washington, DC 20010, USA.
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37
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Gutmann DH, Wu YL, Hedrick NM, Zhu Y, Guha A, Parada LF. Heterozygosity for the neurofibromatosis 1 (NF1) tumor suppressor results in abnormalities in cell attachment, spreading and motility in astrocytes. Hum Mol Genet 2001; 10:3009-16. [PMID: 11751683 DOI: 10.1093/hmg/10.26.3009] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Individuals with the neurofibromatosis 1 (NF1) tumor predisposition syndrome develop low-grade pilocytic astrocytomas at an increased frequency. Previously, we demonstrated that astrocytes from mice heterozygous for a targeted mutation in the Nf1 gene (Nf1+/- astrocytes) exhibit a cell autonomous growth advantage associated with increased RAS pathway activation. In this report, we extend our initial characterization of the effect of reduced Nf1 gene expression on astrocyte function by demonstrating that Nf1+/- astrocytes exhibit decreased cell attachment, actin cytoskeletal abnormalities during the initial phases of cell spreading, and increased cell motility. Whereas these cytoskeletal abnormalities were also observed in Nf1-/- astrocytes, astrocytes expressing a constitutively active RAS molecule showed increased cell motility and abnormal actin cytoskeleton organization during cell spreading, but exhibited normal cell attachment. Based on ongoing gene expression profiling experiments on human astrocytoma tumors, we demonstrate increased expression of two proteins implicated in cell attachment, spreading and motility (GAP43 and T-cadherin) in Nf1+/- and Nf1-/- astrocytes. These results support the emerging notion that tumor suppressor gene heterozygosity results in abnormalities in cell function that may contribute to the pathogenesis of non-tumor phenotypes in NF1.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, Box 8111, 660 South Euclid Avenue, St Louis, MO 63110, USA.
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Abstract
Cancer can result from any number of abnormalities in the control of cell-cycle progression, intracellular signaling and transduction of extracellular cues. Many insights into the crucial events that govern the regulation of cell growth have derived from studies of the gene products mutated in inherited cancer syndromes. Recent work on the neurofibromatosis 2 (NF2) tumor suppressor gene suggests that this negative growth regulator might function by modulating growth factor and extracellular matrix (ECM) signals that trigger Rac1-dependent cytoskeleton-associated processes. In this article, we propose a molecular model for NF2 protein (merlin) function in the light of these and related new findings.
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Affiliation(s)
- L S Sherman
- Vontz Center for Molecular Studies, Dept of Cell Biology, Neurobiology and Anatomy, University of Cincinnati College of Medicine, Cincinnati, OH, USA
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Abstract
The development of cancer involves a myriad of genetic changes that impact on multiple processes important for the orderly regulation of cell growth and differentiation. Genes whose protein products are disrupted during neoplastic transformation are termed "tumor suppressor genes" (TSGs). Many of these TSGs are associated with familial cancer predisposition syndromes, in which affected individuals have an increased risk of certain malignancies. Studies on the mechanism of action for known TSGs have revealed three intracellular loci of critical importance: environmental sensing and signal initiation, signal propagation and transduction, and cell cycle control. The neurofibromatosis 1 and neurofibromatosis 2 genes are discussed as illustrative examples of tumor suppressors that function at the levels of signal transduction and environmental sensing, respectively.
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Affiliation(s)
- E J Uhlmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
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40
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Perry A, Giannini C, Raghavan R, Scheithauer BW, Banerjee R, Margraf L, Bowers DC, Lytle RA, Newsham IF, Gutmann DH. Aggressive phenotypic and genotypic features in pediatric and NF2-associated meningiomas: a clinicopathologic study of 53 cases. J Neuropathol Exp Neurol 2001; 60:994-1003. [PMID: 11589430 DOI: 10.1093/jnen/60.10.994] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Pediatric and NF2-associated meningiomas are uncommon and poorly characterized in comparison to sporadic adult cases. In order to elucidate their molecular features, we analyzed MIB-1, progesterone receptor (PR), NF2, merlin, DAL-1, DAL-1 protein, and chromosomal arms 1p and 14q in 53 meningiomas from 40 pediatric/NF2 patients using immunohistochemistry and dual-color fluorescence in situ hybridization (FISH). Fourteen pediatric (42%) patients, including 5 previously undiagnosed patients, had NF2. The remaining 19 (58%) did not qualify. All 7 of the adult patients had NF2. Meningioma grading revealed 21 benign (40%), 26 atypical (49%), and 6 anaplastic (11%) examples. Other aggressive findings included high mitotic index (32%), high MIB-1 LI (37%), aggressive variant histology (e.g. papillary, clear cell) (25%), brain invasion (17%), recurrence (39%), and patient death (17%). FISH analysis demonstrated deletions of NF2 in 82%, DAL-1 in 82%, 1p in 60%, and 14q in 66%. NF2-associated meningiomas did not differ from sporadic pediatric tumors except for a higher frequency of merlin loss in the former (p = 0.020) and a higher frequency of brain invasion in the latter (p = 0.007). Thus, although pediatric and NF2-associated meningiomas share the common molecular alterations of their adult, sporadic counterparts, a higher fraction are genotypically and phenotypically aggressive. Given the high frequency of undiagnosed NF2 in the pediatric cases, a careful search for other features of this disease is warranted in any child presenting with a meningioma.
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Affiliation(s)
- A Perry
- Divisions of Neuropathology, Washington University School of Medicine, St. Louis, Missouri 63110-1093, USA
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41
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Arbiser JL, Yeung R, Weiss SW, Arbiser ZK, Amin MB, Cohen C, Frank D, Mahajan S, Herron GS, Yang J, Onda H, Zhang HB, Bai X, Uhlmann E, Loehr A, Northrup H, Au P, Davis I, Fisher DE, Gutmann DH. The generation and characterization of a cell line derived from a sporadic renal angiomyolipoma: use of telomerase to obtain stable populations of cells from benign neoplasms. Am J Pathol 2001; 159:483-91. [PMID: 11485907 PMCID: PMC1850536 DOI: 10.1016/s0002-9440(10)61720-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Angiomyolipomas are benign tumors of the kidney derived from putative perivascular epithelioid cells, that may undergo differentiation into cells with features of melanocytes, smooth muscle, and fat. To gain further insight into angiomyolipomas, we have generated the first human angiomyolipoma cell line by sequential introduction of SV40 large T antigen and human telomerase into human angiomyolipoma cells. These cells show phenotypic characteristics of angiomyolipomas, namely differentiation markers of smooth muscle (smooth muscle actin), adipose tissue (peroxisome proliferator-activator receptor gamma, PPARgamma), and melanocytes (microophthalmia, MITF), thus demonstrating that a single cell type can exhibit all of these phenotypes. These cells should serve as a valuable tool to elucidate signal transduction pathways underlying renal angiomyolipomas.
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Affiliation(s)
- J L Arbiser
- Department of Dermatology, Emory University School of Medicine, 1639 Pierce Drive, Atlanta, GA 30322, USA.
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Abstract
Ezrin, radixin, and moesin (ERM proteins), as well as the neurofibromatosis 2 (NF2) tumor suppressor merlin/schwannomin, all belong to the protein 4.1 family, yet only merlin is a tumor suppressor in Schwann cells. To gain insight into the possible functions of ERM proteins in Schwann cells, we examined their localization in peripheral nerve, because we have previously shown that merlin is found in paranodes and in Schmidt-Lanterman incisures. All three ERM proteins were highly expressed in the microvilli of myelinating Schwann cells that surround the nodal axolemma as well as in incisures and cytoplasmic puncta in the vicinity of the node. In all of these locations, ERM proteins were colocalized with actin filaments. In contrast, ERM proteins did not surround nodes in the CNS. The colocalization of ERM proteins with actin indicates that they have functions different from those of merlin in myelinating Schwann cells.
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Affiliation(s)
- S S Scherer
- Department of Neurology, The University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104-6077, USA.
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Perry A, Roth KA, Banerjee R, Fuller CE, Gutmann DH. NF1 deletions in S-100 protein-positive and negative cells of sporadic and neurofibromatosis 1 (NF1)-associated plexiform neurofibromas and malignant peripheral nerve sheath tumors. Am J Pathol 2001; 159:57-61. [PMID: 11438454 PMCID: PMC1850421 DOI: 10.1016/s0002-9440(10)61673-2] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although plexiform neurofibroma (PN) is thought to represent a benign neoplasm with the potential for malignant transformation (malignant peripheral nerve sheath tumor; MPNST), its neoplastic nature has been difficult to prove due to cellular heterogeneity, which hampers standard molecular genetic analysis. Its mixed composition typically includes Schwann cells, fibroblasts, perineurial-like cells, and mast cells. Although NF1 loss of heterozygosity has been reported in subsets of PNs, it remains uncertain which cell type(s) harbor these alterations. Using a dual-color fluorescence in situ hybridization and immunohistochemistry technique, we studied NF1 gene status in S-100 protein-positive and -negative cell subpopulations in archival paraffin-embedded specimens from seven PNs, two atypical PNs, one cellular/atypical PN, and eight MPNSTs derived from 13 patients, seven of which had neurofibromatosis type 1 (NF1). NF1 loss was detected in four of seven PNs and one atypical PN, with deletions entirely restricted to S-100 protein-immunoreactive Schwann cells. In contrast, all eight MPNSTs harbored NF1 deletions, regardless of S-100 protein expression or NF1 clinical status. Our results suggest that the Schwann cell is the primary neoplastic component in PNs and that S-100 protein-negative cells in MPNST represent dedifferentiated Schwann cells, which harbor NF1 deletions in both NF1-associated and sporadic tumors.
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Affiliation(s)
- A Perry
- Departments of Pathology and Neurology, Washington University School of Medicine, St. Louis, Missouri 63110-1093, USA.
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45
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Abstract
Neurofibromatosis 2 (NF2) is a tumor predisposition syndrome in which affected individuals develop nervous system tumors at an increased frequency. The most common tumor in individuals with NF2 is the schwannoma, which is composed of neoplastic Schwann cells lacking NF2 gene expression. Moreover, inactivation of the NF2 gene is observed in nearly all sporadic schwannomas, suggesting that the NF2 gene is a critical growth regulator for Schwann cells. In an effort to gain insights into the function of the NF2 gene product, merlin or schwannomin, we performed a detailed functional analysis of eight naturally occurring non-conservative missense mutations in the NF2 gene. Using a regulatable expression system in rat schwannoma cells, we analyzed proliferation, actin cytoskeleton-mediated events and merlin folding. In this report, we demonstrate that mutations clustered in the predicted alpha-helical region did not impair the function of merlin whereas those in either the N- or C-terminus of the protein rendered merlin inactive as a negative growth regulator. These results suggest that the key functional domains of merlin lie within the highly conserved FERM domain and the unique C-terminus of the protein.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, Box 8111, 660 South Euclid Avenue, St Louis, MO 63110, USA.
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46
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Ding H, Roncari L, Shannon P, Wu X, Lau N, Karaskova J, Gutmann DH, Squire JA, Nagy A, Guha A. Astrocyte-specific expression of activated p21-ras results in malignant astrocytoma formation in a transgenic mouse model of human gliomas. Cancer Res 2001; 61:3826-36. [PMID: 11325859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Activation of the p21-ras signaling pathway from aberrantly expressed receptors promotes the growth of malignant human astrocytomas. We developed a transgenic mouse astrocytoma model using the glial fibrillary acidic protein (GFAP) promoter to express oncogenic V(12)Ha-ras, specifically in astrocytes. The development of GFAP-immunoreactive astrocytomas was directly proportional to the level of V(12)Ha-ras transgene expression. Chimeras expressing high levels of V(12)Ha-ras in astrocytes died from multifocal malignant astrocytomas within 2 weeks, whereas those with moderate levels went to germ-line transmission. Ninety-five percent of these mice died from solitary or multifocal low- and high-grade astrocytomas within 2-6 months. These transgenic astrocytomas are pathologically similar to human astrocytomas, with a high mitotic index, nuclear pleomorphism, infiltration, necrosis, and increased vascularity. Derivative astrocytoma cells are tumorigenic upon inoculation in another host. The transgenic astrocytomas exhibit additional molecular alterations associated with human astrocytomas, including a decreased or absent expression of p16, p19, and PTEN as well as overexpression of EGFR, MDM2, and CDK4. Cytogenetic analysis revealed consistent clonal aneuploidies of chromosomal regions syntenic with comparable loci altered in human astrocytomas. Therefore, this transgenic mouse astrocytoma model recapitulates many of the molecular histopathological and growth characteristics of human malignant astrocytomas in a reproducible, germ-line-transmitted, and high-penetrance manner.
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Affiliation(s)
- H Ding
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, M5G 1X5 Canada
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Abstract
Progress in understanding the biology of the neurofibromatoses (NF1 and NF2) offers hope for the development of new, effective methods of treatment. In May 2000, the National Institute of Neurological Disorders and Stroke (NINDS) hosted a workshop that included leading researchers and clinicians from the NF community. The goal of the meeting was to assess current knowledge and identify priorities for future research. Needs identified included the development of better animal models, further study of the function of the NF1 and NF2 genes, and investigation of the role of modifier genes. The participants agreed that it will also be important to define further the natural history of NF1 and NF2 and to develop an infrastructure to support clinical trials. They also discussed the possible creation of research consortia and NF centers to promote the integration of basic and clinical research.
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Affiliation(s)
- M MacCollin
- Neuroscience Center MGH East, Charlestown, Massachusetts, USA
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Morrison H, Sherman LS, Legg J, Banine F, Isacke C, Haipek CA, Gutmann DH, Ponta H, Herrlich P. The NF2 tumor suppressor gene product, merlin, mediates contact inhibition of growth through interactions with CD44. Genes Dev 2001; 15:968-80. [PMID: 11316791 PMCID: PMC312675 DOI: 10.1101/gad.189601] [Citation(s) in RCA: 383] [Impact Index Per Article: 16.7] [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] [Indexed: 11/24/2022]
Abstract
The neurofibromatosis-2 (NF2) gene encodes merlin, an ezrin-radixin-moesin-(ERM)-related protein that functions as a tumor suppressor. We found that merlin mediates contact inhibition of growth through signals from the extracellular matrix. At high cell density, merlin becomes hypo-phosphorylated and inhibits cell growth in response to hyaluronate (HA), a mucopolysaccharide that surrounds cells. Merlin's growth-inhibitory activity depends on specific interaction with the cytoplasmic tail of CD44, a transmembrane HA receptor. At low cell density, merlin is phosphorylated, growth permissive, and exists in a complex with ezrin, moesin, and CD44. These data indicate that merlin and CD44 form a molecular switch that specifies cell growth arrest or proliferation.
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Affiliation(s)
- H Morrison
- Forschungszentrum Karlsruhe, Institute of Toxicology and Genetics, and University of Karlsruhe, Institute of Genetics, 76021 Karlsruhe, Germany
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Abstract
BACKGROUND Individuals affected with neurofibromatosis 1 (NF1) develop juvenile pilocytic astrocytomas (JPA) at an increased frequency, suggesting that the NF1 gene product, neurofibromin, functions as a negative growth regulator for astrocytes. Previously, the authors demonstrated that NF1-associated astrocytomas exhibit deletions and loss of NF1 gene expression on the DNA and protein levels. However, little is known about additional genetic events in clinically and radiographically progressive NF1-associated pilocytic astrocytomas. OBJECTIVE/METHODS To understand the potential role of cooperating genetic events in the development of these low-grade tumors, the authors used immunohistochemistry and selected confirmatory Western blots to examine nine symptomatic NF1-associated pilocytic astrocytomas for gene products whose expression patterns are altered in fibrillary astrocytomas. RESULTS The authors demonstrate that p53, p16, retinoblastoma (RB), epidermal growth factor receptor (EGFR), cyclin-dependent kinase 4 (CDK4), platelet-derived growth factor A (PDGF-A) and PDGF receptor alpha (PDGF-Ralpha) protein expression profiles are not altered in NF1-associated pilocytic astrocytomas. Similar to their sporadic counterparts, NF1-associated JPA also strongly expressed PEN5, a marker of post-O2A stage oligodendroglial precursor cells. CONCLUSIONS These results suggest that NF1-associated pilocytic astrocytomas lack the genetic changes typically associated with the more clinically aggressive fibrillary astrocytomas and lay the foundation for future studies to identify NF1 JPA-specific alterations.
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Affiliation(s)
- J Li
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA
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Gutmann DH, Hirbe AC, Huang ZY, Haipek CA. The protein 4.1 tumor suppressor, DAL-1, impairs cell motility, but regulates proliferation in a cell-type-specific fashion. Neurobiol Dis 2001; 8:266-78. [PMID: 11300722 DOI: 10.1006/nbdi.2000.0376] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The neurofibromatosis 2 (NF2) tumor suppressor belongs to the Protein 4.1 family of molecules that link the actin cytoskeleton to cell surface glycoproteins. We have previously demonstrated that the NF2 protein, merlin, can suppress cell growth in vitro and in vivo as well as impair actin cytoskeleton-associated processes, such as cell spreading, attachment, and motility. Recently, we determined that expression of a second Protein 4.1 tumor suppressor, DAL-1, was lost in 60% of sporadic meningiomas, but not schwannomas. In this report, we demonstrate that DAL-1 suppresses cell proliferation in meningioma, but not schwannoma cells. Similar to merlin, DAL-1 interacts with other ERM proteins and betaII-spectrin, but not the merlin interactor protein, SCHIP-1. In addition, we report the identification of the full-length DAL-1 tumor suppressor, termed KIAA0987. Collectively, these results suggest that the two Protein 4.1 meningioma tumor suppressors, merlin and DAL-1, may be functionally distinct proteins with different mechanisms of action.
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Affiliation(s)
- D H Gutmann
- Department of Neurology, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, Missouri 63110, USA
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