1
|
Andersen MS, Kofoed MS, Paludan-Müller AS, Pedersen CB, Mathiesen T, Mawrin C, Wirenfeldt M, Kristensen BW, Olsen BB, Halle B, Poulsen FR. Meningioma animal models: a systematic review and meta-analysis. J Transl Med 2023; 21:764. [PMID: 37898750 PMCID: PMC10612271 DOI: 10.1186/s12967-023-04620-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 10/11/2023] [Indexed: 10/30/2023] Open
Abstract
BACKGROUND Animal models are widely used to study pathological processes and drug (side) effects in a controlled environment. There is a wide variety of methods available for establishing animal models depending on the research question. Commonly used methods in tumor research include xenografting cells (established/commercially available or primary patient-derived) or whole tumor pieces either orthotopically or heterotopically and the more recent genetically engineered models-each type with their own advantages and disadvantages. The current systematic review aimed to investigate the meningioma model types used, perform a meta-analysis on tumor take rate (TTR), and perform critical appraisal of the included studies. The study also aimed to assess reproducibility, reliability, means of validation and verification of models, alongside pros and cons and uses of the model types. METHODS We searched Medline, Embase, and Web of Science for all in vivo meningioma models. The primary outcome was tumor take rate. Meta-analysis was performed on tumor take rate followed by subgroup analyses on the number of cells and duration of incubation. The validity of the tumor models was assessed qualitatively. We performed critical appraisal of the methodological quality and quality of reporting for all included studies. RESULTS We included 114 unique records (78 using established cell line models (ECLM), 21 using primary patient-derived tumor models (PTM), 10 using genetically engineered models (GEM), and 11 using uncategorized models). TTRs for ECLM were 94% (95% CI 92-96) for orthotopic and 95% (93-96) for heterotopic. PTM showed lower TTRs [orthotopic 53% (33-72) and heterotopic 82% (73-89)] and finally GEM revealed a TTR of 34% (26-43). CONCLUSION This systematic review shows high consistent TTRs in established cell line models and varying TTRs in primary patient-derived models and genetically engineered models. However, we identified several issues regarding the quality of reporting and the methodological approach that reduce the validity, transparency, and reproducibility of studies and suggest a high risk of publication bias. Finally, each tumor model type has specific roles in research based on their advantages (and disadvantages). SYSTEMATIC REVIEW REGISTRATION PROSPERO-ID CRD42022308833.
Collapse
Affiliation(s)
- Mikkel Schou Andersen
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark.
- BRIDGE (Brain Research - Inter Disciplinary Guided Excellence), University of Southern Denmark, Odense, Denmark.
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
| | - Mikkel Seremet Kofoed
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark
- BRIDGE (Brain Research - Inter Disciplinary Guided Excellence), University of Southern Denmark, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Asger Sand Paludan-Müller
- Nordic Cochrane Centre, Rigshospitalet, Copenhagen University, Copenhagen, Denmark
- Centre for Evidence-Based Medicine Odense (CEBMO) and NHTA: Market Access & Health Economics Consultancy, Copenhagen, Denmark
| | - Christian Bonde Pedersen
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark
- BRIDGE (Brain Research - Inter Disciplinary Guided Excellence), University of Southern Denmark, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Tiit Mathiesen
- Department of Neurosurgery, Rigshospitalet, Copenhagen University, Copenhagen, Denmark
| | - Christian Mawrin
- Department of Neuropathology, Otto-Von-Guericke University, Magdeburg, Germany
| | - Martin Wirenfeldt
- Department of Pathology and Molecular Biology, Hospital South West Jutland, Esbjerg, Denmark
- Department of Regional Health Research, University of Southern, Odense, Denmark
| | | | - Birgitte Brinkmann Olsen
- Clinical Physiology and Nuclear Medicine, Odense University Hospital, Odense, Denmark
- Department of Surgical Pathology, Zealand University Hospital, Roskilde, Denmark
| | - Bo Halle
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark
- BRIDGE (Brain Research - Inter Disciplinary Guided Excellence), University of Southern Denmark, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Frantz Rom Poulsen
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark
- BRIDGE (Brain Research - Inter Disciplinary Guided Excellence), University of Southern Denmark, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| |
Collapse
|
2
|
Grading Trigone Meningiomas Using Conventional Magnetic Resonance Imaging With Susceptibility-Weighted Imaging and Perfusion-Weighted Imaging. J Comput Assist Tomogr 2022; 46:103-109. [PMID: 35027521 DOI: 10.1097/rct.0000000000001256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To compare conventional magnetic resonance imaging (MRI), susceptibility-weighted imaging (SWI), and perfusion-weighted imaging (PWI) characteristics in different grades of trigone meningiomas. METHODS Thirty patients with trigone meningiomas were enrolled in this retrospective study. Conventional MRI was performed in all patients; SWI (17 cases), dynamic contrast-enhanced PWI (10 cases), and dynamic susceptibility contrast PWI (6 cases) were performed. Demographics, conventional MRI features, SWI- and PWI-derived parameters were compared between different grades of trigone meningiomas. RESULTS On conventional MRI, the irregularity of tumor shape (ρ = 0.497, P = 0.005) and the extent of peritumoral edema (ρ = 0.187, P = 0.022) might help distinguish low-grade and high-grade trigone meningiomas. On multiparametric functional MRI, rTTPmax (1.17 ± 0.06 vs 1.30 ± 0.05, P = 0.048), Kep, Ve, and iAUC demonstrated their potentiality to predict World Health Organization grades I, II, and III trigone meningiomas. CONCLUSIONS Conventional MRI combined with dynamic susceptibility contrast and dynamic contrast-enhanced can help predict the World Health Organization grade of trigone meningiomas.
Collapse
|
3
|
Ansari SF, Shah KJ, Hassaneen W, Cohen-Gadol AA. Vascularity of meningiomas. HANDBOOK OF CLINICAL NEUROLOGY 2020; 169:153-165. [PMID: 32553286 DOI: 10.1016/b978-0-12-804280-9.00010-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Information on the vascular supply to meningiomas is critical to the neurosurgeon. Most meningiomas are supplied by the external carotid artery, though many get pial contribution as well. Angiogenesis is critical for these neoplasms to grow. Vascular endothelial growth factor (VEGF) has been a popular target of research to decrease angiogenesis. Peritumoral brain edema (PTBE) is occasionally seen in meningiomas, which makes surgical resection more challenging. The exact cause of PTBE remains unclear, but a number of factors have been postulated to contribute. Assessment of the vascularity of meningiomas is best carried out with angiography, but noninvasive techniques are improving, diminishing the need for more invasive imaging. Embolization of tumors can be performed to minimize perioperative blood loss and potentially lower surgical morbidity. However, it has not been shown to improve outcomes, and procedural risks exist. Higher grade tumors commonly have higher vascularity. Higher vascular meningiomas are more likely to recur and have higher levels of VEGF. The vascularity of meningiomas remains a topic of interest and is the focus of many research projects.
Collapse
Affiliation(s)
- Shaheryar F Ansari
- Department of Neurological Surgery, Indiana University, Indianapolis, IN, United States
| | - Kushal J Shah
- Department of Neurological Surgery, Indiana University, Indianapolis, IN, United States; Department of Neurosurgery, University of Kansas, Kansas City, MO, United States
| | - Wael Hassaneen
- Department of Neurological Surgery, Indiana University, Indianapolis, IN, United States; Carle Neuroscience Institute, Carle Foundation Hospital, Urbana, IL, United States; Department of Neurosurgery, Carle Illinois College of Medicine, Champaign, IL, United States
| | - Aaron A Cohen-Gadol
- Department of Neurological Surgery, Indiana University, Indianapolis, IN, United States.
| |
Collapse
|
4
|
Cao X, Hao S, Wu Z, Wang L, Jia G, Zhang L, Zhang J. Survival rates, prognostic factors and treatment of anaplastic meningiomas. J Clin Neurosci 2015; 22:828-33. [PMID: 25827863 DOI: 10.1016/j.jocn.2014.11.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 11/19/2014] [Indexed: 11/25/2022]
Abstract
Intracranial anaplastic meningioma is a malignant type of meningioma with a high rate of recurrence and death. Given its rarity, minimal information regarding this tumour is available. Thus, we studied a series of patients with anaplastic meningiomas and analysed the survival rates, prognostic factors and treatment methods associated with these patients. Forty-three anaplastic meningioma cases treated at our hospital between July 2002 and June 2012 were compiled into a single database used to summarise the clinical characteristics from a retrospective review of patient records. Progression free survival (PFS) and overall survival (OS) were analysed as a function of each possible prognostic factor. The 1, 3 and 5 year PFS rates were 90.7%, 51.3%, and 37.0%, respectively, whereas the corresponding values of OS rates were 95.3%, 68.0% and 49.2%, respectively. A number of factors were selected to analyse association with prognosis. Simpson Grade I and II resections exhibited increased PFS rates and radiotherapy improved the OS rate in anaplastic meningiomas. Tumours with homogeneous contrast enhancement on MRI were associated with increased PFS and OS. Sex, age, tumour location, first or transformed anaplastic tumour, pre-operative Karnofsky Performance Scores, tumour volumes and bone involvement had no significant effect on either PFS or OS. MRI homogeneous contrast may be a useful prognostic factor and surgery followed by radiotherapy is recommended for the treatment of anaplastic meningiomas.
Collapse
Affiliation(s)
- Xiaoyu Cao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Shuyu Hao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Zhen Wu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Liang Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Guijun Jia
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Liwei Zhang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China
| | - Junting Zhang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili 6, Dongcheng District, Beijing 100050, People's Republic of China.
| |
Collapse
|
5
|
Hammouche S, Clark S, Wong AHL, Eldridge P, Farah JO. Long-term survival analysis of atypical meningiomas: survival rates, prognostic factors, operative and radiotherapy treatment. Acta Neurochir (Wien) 2014; 156:1475-81. [PMID: 24965072 DOI: 10.1007/s00701-014-2156-z] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 06/05/2014] [Indexed: 11/27/2022]
Abstract
BACKGROUND The rarity and the inconsistent criteria for defining atypical meningioma prior to the WHO 2007 classification made its management and prognostic factors poorly understood. Only few articles have addressed the survival rates of WHO-classified atypical meningiomas. The small number or the disproportionate representation of irradiated patients was a weakness for these articles. This study evaluated whether the extent of surgery and receiving adjuvant radiotherapy after an initial operation along with other patient characteristics influenced the recurrence and survival rates of atypical meningiomas. METHODS The clinical and surgical notes of the 79 patients with grade II atypical meningioma treated at our center over 13 years were retrospectively evaluated. The histology grading was consistent with WHO 2007 classification. The Simpson grading system was used to assess the extent of surgical resection. Kaplan Meier analysis, Cox multivariate regression analysis, and the Log-rank test were conducted using STATA® statistical package. RESULTS The average age at the time of initial operation was 58 years, and 54 % were males. The mean follow-up period was 50 months. In Cox multivariate analysis, only Simpson grading was predictive of recurrence (hazard ratio = 2.22 / 1 increase in Simpson grade. p = 0.003). Simpson grade I patients had a relapse-free survival rate of 97 and 74 % at one and five years, respectively, compared with 88 and 32 % in the subtotal resection group (Simpson grades II to IV). There was no statistically significant correlation between recurrence and subjecting patients to postoperative radiotherapy. Apart from Simpson grade I patients, there was a general trend for worse outcome in irradiated patients. CONCLUSIONS The most important prognostic factor in determining recurrence was Simpson grading. There was no statistically significant impact of adjuvant radiotherapy on the recurrence of atypical meningiomas. Meta-analysis for the existing literature is needed.
Collapse
Affiliation(s)
- Salah Hammouche
- Neurosurgery Department, The Walton Centre for Neurology and Neurosurgery NHS Foundation Trust, Liverpool, L9 7LJ, Merseyside, UK,
| | | | | | | | | |
Collapse
|
6
|
Expression of mesothelioma-related markers in meningiomas: an immunohistochemical study. BIOMED RESEARCH INTERNATIONAL 2014; 2014:968794. [PMID: 24987706 PMCID: PMC4022005 DOI: 10.1155/2014/968794] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/11/2014] [Indexed: 01/18/2023]
Abstract
Background. Meningiomas are common intracranial tumors. Recently, histogenetic and phenotypic similarities between meningiomas and mesotheliomas have been proposed. We were interested in whether these similarities are reflected on the immunohistochemical level, which would add new potentially diagnostic markers for meningiomas.
Methods. The expression of mesothelioma-related markers (D2-40, Calretinin, Keratin 5/6, WT1, and Methotheioma-Ab1) was investigated in 87 cases of meningiomas and compared to EMA expression. Results. 73.6% of meningioma cases were grade I, 20.7% were grade II, and 5.7% were grade III. 83.9% of meningioma cases were classical and 16.1% had special nonmeningothelial features. D2-40 was expressed in 37.9% of cases and was significantly restricted to classical meningiomas. Calretinin and WT1 were negative while Keratin 5/6 and Mesothelioma-Ab1 were weakly expressed in classical variants (5.7% and 3.4%, resp.). EMA was consistently expressed in all cases. Its expression was significantly higher than that of mesothelioma-related markers; this held true also when D2-40 expression was considered separately. Conclusions. Mesothelioma-related markers are not extensively expressed in meningiomas, a finding that argues against their proposed histogenetic and phenotypic similarities. Compared to EMA, the significantly lower expression of mesothelioma-related markers and their restricted expression to classical meningioma variants hamper their potential future use as diagnostic markers for meningioma.
Collapse
|
7
|
Pintea B, Kinfe TM, Baumert BG, Boström J. Earlier and sustained response with incidental use of cardiovascular drugs among patients with low- to medium-grade meningiomas treated with radiosurgery (SRS) or stereotactic radiotherapy (SRT). Radiother Oncol 2014; 111:446-50. [PMID: 24998705 DOI: 10.1016/j.radonc.2014.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 05/05/2014] [Accepted: 05/13/2014] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND PURPOSE Beneficial outcome for cancer treated with radiotherapy (RT) and β-blockers has been reported. We hypothesize a potential combined impact of stereotactic RT with incidental use of cardiovascular drugs also in meningiomas. MATERIALS AND METHODS In 64 patients with 70 intracranial meningiomas (male/female=17/53; median follow-up=2 years) from a prospective database with sustained RT/cardiovascular drug therapy tumor response (progression, stable disease, regression) was evaluated at predefined follow-up intervals of 3, 12 and 24 months based on MR-imaging. For this retrospective cohort analysis stepwise univariate and multivariate analyses for group comparison were performed. Between groups analysis and stepwise uni- and multivariate analysis was performed. RESULTS At one year follow-up there was a significant better tumor response for patients with antihypertensives use (p=0.008) and radiosurgery (SRS) (p=0.054), the difference between patients with and without antihypertensive medication remains significant in multivariate analysis. Two years after RT, only patients with β-blocker use had a significant better response to RT (p=0.032). Additionally, for the use of β-blockers a trend toward significance for early tumor response at 3 months compared to the control group was observed (p(one tailed)=0.059). CONCLUSIONS Our data suggest that concomitant antihypertensive medication (especially β-blockers) may lead to an earlier and sustained response in stereotactic irradiated low- to medium-grade intracranial meningiomas by affecting the β-adrenergic pathways.
Collapse
Affiliation(s)
- Bogdan Pintea
- Department of Neurosurgery, University of Bonn Medical Center, Germany
| | - Thomas M Kinfe
- Department of Neurosurgery, University of Bonn Medical Center, Germany
| | - Brigitta G Baumert
- Department of Radiosurgery and Stereotactic Radiotherapy, MediClin Robert Janker Clinic, Bonn, Germany; Clinical Cooperation Unit Neurooncology, MediClin Robert Janker Clinic & University of Bonn Medical Center, Germany
| | - Jan Boström
- Department of Neurosurgery, University of Bonn Medical Center, Germany; Department of Radiosurgery and Stereotactic Radiotherapy, MediClin Robert Janker Clinic, Bonn, Germany; Clinical Cooperation Unit Neurooncology, MediClin Robert Janker Clinic & University of Bonn Medical Center, Germany.
| |
Collapse
|
8
|
Kılıç K, Avsar T, Akgün E, Özkan A, Toktaş ZO, Şeker A, Kılıç T. Gamma knife radiosurgery inhibits angiogenesis of meningiomas: in vivo rat corneal assay. World Neurosurg 2013; 80:598-604. [PMID: 23851230 DOI: 10.1016/j.wneu.2013.06.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 05/29/2013] [Accepted: 06/14/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE The aim of this study is to reveal inhibitory effect of gamma knife irradiation on angiogenesis of meningiomas using rat corneal angiogenesis assay. METHODS A total of 72 rats were divided into three preliminary groups. Each group, consisting of 24 rats, was implanted to World Health Organization (WHO) grade I (typical), grade II (atypical), and grade III (malignant) meningioma. Each of these three preliminary groups of 24 rats, were then divided into four subgroups, each consisting of 6 rats and subsequently irradiated by gamma knife with dose prescriptions of 0, 14, 18, and 22 Gy. The numbers of vessels that developed around the micropockets of the corneas were counted and photographed on days 5, 10, 15, and 20. RESULTS For WHO grade I meningiomas, 18 and 22 Gy doses (P < 0.001), and for grade II meningiomas, the 22-Gy (P = 0.021) dose were found to inhibit tumor-induced angiogenesis compared with the radiation-free control group. For grade III meningiomas, there was no statistical difference with the control group in any of the doses applied. Our findings demonstrate that gamma knife irradiation may suppress the angiogenic activity of WHO grades I and II meningiomas but not of the grade III meningiomas. CONCLUSIONS For the first time, this study provides an experimental data to show the antiangiogenic effect of gamma knife irradiation on meningiomas.
Collapse
Affiliation(s)
- Kaya Kılıç
- Istanbul Training and Research Hospital, Department of Neurosurgery, Samatya, Turkey
| | | | | | | | | | | | | |
Collapse
|
9
|
Karal-Yilmaz O, Ozkan A, Akgun E, Kukut M, Baysal K, Avsar T, Kilic T. Controlled release of imatinib mesylate from PLGA microspheres inhibit craniopharyngioma mediated angiogenesis. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:147-153. [PMID: 23053813 DOI: 10.1007/s10856-012-4784-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Accepted: 09/27/2012] [Indexed: 06/01/2023]
Abstract
Poly(lactic-co-glycolic acid) microspheres loaded with imatinib mesylate has been developed as a new therapeutic strategy to prevent craniopharyngioma recurrence. Microspheres composed of different lactic/glycolic acid ratios, molecular weights and drug compositions were synthesized and loaded with imatinib mesylate by modified double-emulsion/solvent evaporation technique and subsequently characterized by particle-size distribution, scanning electron microscopy, encapsulation efficiency and in vitro drug release. Inhibitory potential of imatinib containing microspheres on tumor neovascularization was investigated on craniopharyngioma tumor samples by rat cornea angiogenesis assay. Results showed that microspheres in different LA:GA ratios [LA:GA 50:50 (G50), 75:25 (G25), 85:15 (G15)] considerably reduced neovascularization induced by recurrent tumor samples in an in vivo angiogenesis assay (P < 0.01). Our data indicate that local delivery of imatinib mesylate to the post-surgical tumoral cavity using biodegradable microspheres may be a promising biologically selective approach to prevent the recurrence of craniopharyngiomas, via inhibition of neovascularization.
Collapse
Affiliation(s)
- Oksan Karal-Yilmaz
- TUBITAK, Marmara Research Center, Genetic Engineering and Biotechnology Institute, Gebze-Kocaeli, Turkey.
| | | | | | | | | | | | | |
Collapse
|
10
|
Yener U, Avsar T, Akgün E, Şeker A, Bayri Y, Kılıç T. Assessment of antiangiogenic effect of imatinib mesylate on vestibular schwannoma tumors using in vivo corneal angiogenesis assay. J Neurosurg 2012; 117:697-704. [DOI: 10.3171/2012.6.jns112263] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
Angiogenesis and the platelet-derived growth factor (PDGF) pathway are active in the pathogenesis of vestibular schwannomas (VSs). The purpose of this study was to test whether imatinib mesylate (Gleevec), a PDGF receptor (PDGFR) blocker, reduces angiogenic capacity in sporadic VS and in VS associated with neurofibromatosis Type 2 (NF2) using a corneal angiogenesis assay.
Methods
From 121 VS tissue samples stored in the tumor bank at the Marmara University Institute of Neurological Sciences, 10 samples (6 from sporadic cases, 4 from NF2-associated cases) were selected at random for use in this study. Expression of PDGF-A and PDGF-B and their receptors was evaluated in sporadic and NF2-associated VS as well as in glioblastoma (GBM) and normal brain tissue by means of immunohistochemistry and Western blot analysis. Corneal angiogenesis assay was then used to evaluate the angiogenic capacity of tissue specimens from sporadic and NF2-associated VS with and without imatinib treatment as well as positive and negative controls (GBM and normal brain tissue).
Results
The angiogenic potential of the sporadic and NF2-associated VS tumor tissue differed significantly from that of the positive and negative control tissues (p <0.05). Furthermore, NF2-associated VS showed significantly lower angiogenic potential than sporadic VS (p <0.05). Imatinib treatment significantly reduced the angiogenic potential in both the sporadic VS and the NF2-associated VS groups. The level of PDGF-A and PDGFR-α as well as PDGF-B and PDGFR-β expression in sporadic VS and NF2-associated VS also differed significantly (p <0.05) from the levels in controls. Additionally the level of PDGFR-β was significantly higher in sporadic VS than in NF2-associated VS (p <0.05).
Conclusions
The findings of this study indicate that NF2-associated VS has significantly more angiogenic potential than sporadic VS and normal brain tissue. Additionally, imatinib reduces the angiogenic activity of both sporadic and NF2-associated VS. The authors conclude that imatinib may be a potential treatment for VS, especially for NF2-associated lesions that cannot be cured with resection or radiosurgery.
Collapse
Affiliation(s)
- Ulaş Yener
- 1Institute of Neurological Sciences and
- 2Department of Neurosurgery, Faculty of Medicine, Marmara University; and
| | - Timucin Avsar
- 1Institute of Neurological Sciences and
- 3Dr Orhan Öcalgiray Molecular Biology-Biotechnology and Genetics Research Centre, Istanbul Technical University, Istanbul, Turkey
| | | | - Aşkın Şeker
- 1Institute of Neurological Sciences and
- 2Department of Neurosurgery, Faculty of Medicine, Marmara University; and
| | - Yaşar Bayri
- 1Institute of Neurological Sciences and
- 2Department of Neurosurgery, Faculty of Medicine, Marmara University; and
| | - Türker Kılıç
- 1Institute of Neurological Sciences and
- 2Department of Neurosurgery, Faculty of Medicine, Marmara University; and
| |
Collapse
|
11
|
Ozkan A, Guduk M, Atabay KD, Uyar SB, Seker A, Konya D, Pamir MN, Kilic T. High angiogenic potential in an in vivo rat corneal model is associated with shorter disease-free survival in low-grade oligodendrogliomas. J Clin Neurosci 2011; 18:109-13. [DOI: 10.1016/j.jocn.2010.05.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2009] [Revised: 04/07/2010] [Accepted: 05/22/2010] [Indexed: 11/25/2022]
|