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Zohdy YM, Saini M, Heit J, Neill S, Morales-Vargas B, Hoang K, Pradilla G, Garzon-Muvdi T. Comparison of Resection Assisting Devices in the Process of Collecting Brain Tumor Tissue for Basic Research: Microdebrider Versus Ultrasonic Aspirator. World Neurosurg 2024; 181:e384-e391. [PMID: 37852473 DOI: 10.1016/j.wneu.2023.10.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 10/20/2023]
Abstract
INTRODUCTION Brain tumors display significant inter and intratumoral heterogeneity, impacting disease progression and outcomes. Preserving surgically resected tissue is vital for ensuring accurate research results to enhance understanding of tumor pathophysiology. This study evaluates tissue integrity and viability of tissue resected using 2 surgical devices for tumor resection: a mechanical microdebrider (MD) and an ultrasonic aspirator (UA). METHODS Tumor samples were obtained from patients undergoing surgical resection of primary and secondary intracranial tumors. Cell viability was assessed, and histopathological analysis of Hematoxylin and Eosin -stained tissues was performed. Adherent monolayer and neurospheres cell cultures were established from paired samples. RNA isolation and quantitative polymerase chain reaction of housekeeping genes were conducted to compare genetic integrity. RESULTS The cellular viability was comparable between samples obtained using both the MD and the UA, with a mean viability of 75.2% ± 15.6 and 70.7% ± 16.8, respectively (P = 0.318). Histopathological evaluation indicated no discernible differences in cellular integrity between the devices. Cell culture success rates and growth characteristics were similar for both devices. RNA concentration and integrity were well-maintained in both MD and UA samples, with no significant differences (P = 0.855). Quantitative polymerase chain reaction analysis of housekeeping genes showed consistent results across matched tissues from both devices and different tumor pathologies. CONCLUSIONS Surgical handheld devices provide valuable, high-quality tissue samples for research. Surgeon preference, tumor pathology, and anatomical location dictate device choice. Both MD and UA devices are reliable for obtaining quality tissue specimens, facilitating translational neuro-oncology research.
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Affiliation(s)
- Youssef M Zohdy
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Manpreet Saini
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Jeremy Heit
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Stewart Neill
- Department of Pathology, Emory University, Atlanta, Georgia, USA
| | | | - Kimberly Hoang
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
| | - Gustavo Pradilla
- Department of Neurosurgery, Emory University, Atlanta, Georgia, USA
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Wedemeyer MA, Muskens I, Strickland BA, Aurelio O, Martirosian V, Wiemels JL, Weisenberger DJ, Wang K, Mukerjee D, Rhie SK, Zada G. Epigenetic dysregulation in meningiomas. Neurooncol Adv 2022; 4:vdac084. [PMID: 35769412 PMCID: PMC9234763 DOI: 10.1093/noajnl/vdac084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Background Meningiomas are the most common primary brain tumor. Though typically benign with a low mutational burden, tumors with benign histology may behave aggressively and there are no proven chemotherapies. Although DNA methylation patterns distinguish subgroups of meningiomas and have higher predictive value for tumor behavior than histologic classification, little is known about differences in DNA methylation between meningiomas and surrounding normal dura tissue. Methods Whole-exome sequencing and methylation array profiling were performed on 12 dura/meningioma pairs (11 WHO grade I and 1 WHO grade II). Single-nucleotide polymorphism (SNP) genotyping and methylation array profiling were performed on an additional 19 meningiomas (9 WHO grade I, 5 WHO grade II, 4 WHO grade III). Results Using multimodal studies of meningioma/dura pairs, we identified 4 distinct DNA methylation patterns. Diffuse DNA hypomethylation of malignant meningiomas readily facilitated their identification from lower-grade tumors by unsupervised clustering. All clusters and 12/12 meningioma-dura pairs exhibited hypomethylation of the gene promoters of a module associated with the craniofacial patterning transcription factor FOXC1 and its upstream lncRNA FOXCUT. Furthermore, we identified an epigenetic continuum of increasing hypermethylation of polycomb repressive complex target promoters with increasing histopathologic grade. Conclusion These findings support future investigations of the role of epigenetic dysregulation of FOXC1 and cranial patterning genes in meningioma formation as well as studies of the utility of polycomb inhibitors for the treatment of malignant meningiomas.
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Affiliation(s)
- Michelle A Wedemeyer
- Department of Neurosurgery, University of California San Francisco, Benioff Children’s Hospitals, San Francisco, California, USA
| | - Ivo Muskens
- Children’s Cancer Research Laboratory, Center of Genetic Epidemiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Ben A Strickland
- Department of Neurosurgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Oscar Aurelio
- Department of Neurosurgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA,Brain Tumor Center, University of Southern California, Los Angeles, California, USA
| | - Vahan Martirosian
- Brain Tumor Center, University of Southern California, Los Angeles, California, USA
| | - Joseph L Wiemels
- Children’s Cancer Research Laboratory, Center of Genetic Epidemiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Daniel J Weisenberger
- Department of Biochemistry and Molecular Medicine, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Kai Wang
- Department of Pathology and Laboratory Medicine, Children’s Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Debraj Mukerjee
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Suhn K Rhie
- Suhn K. Rhie, PhD, Department of Biochemistry and Molecular Medicine, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA ()
| | - Gabriel Zada
- Corresponding Authors: Gabriel Zada, MD, MS, Department of Neurosurgery, Keck School of Medicine, University of Southern California, 1200 N State Street, Los Angeles, CA 90033, USA ()
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Deshpande K, Martirosian V, Nakamura BN, Iyer M, Julian A, Eisenbarth R, Shao L, Attenello F, Neman J. Neuronal exposure induces neurotransmitter signaling and synaptic mediators in tumors early in brain metastasis. Neuro Oncol 2021; 24:914-924. [PMID: 34932815 DOI: 10.1093/neuonc/noab290] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Brain metastases (BM) are responsible for neurological decline and poor overall survival. Although the pro-metastatic roles of glial cells, and the acquisition of neuronal attributes in established BM tumors have been described, there are no studies that investigate the initial interplay between neurons and brain-seeking tumor cells. The aim of this study was to characterize early tumor-neuron interactions and the induced CNS-adaptive changes in tumor cells prior to macro-colonization. METHODS Utilizing pure neuronal cultures and brain-naïve and patient-derived BM tumor cells, we surveyed the early induction of mediators of neurotransmitter (NT) and synaptic signaling in breast and lung tumor cells. Reliance on microenvironmental GABA in breast-to-brain metastatic cells (BBMs) was assessed in vitro and in vivo. RESULTS Co-culture with neurons induces early expression of classical NT receptor genes (HTR4, GRIA2, GRIN2B, GRM4, GRM8, DRD1) and neuronal synaptic mediators (CNR1, EGR2, ARC, NGFR, NRXN1) in breast and lung cancer cells. NT-dependent classification of tumor cells within the neuronal niche shows breast cancer cells become GABAergic responsive brain metastases (GRBMs) and transition from relying on autocrine GABA, to paracrine GABA from adjacent neurons; while autocrine Dopaminergic breast and lung tumor cells persist. In vivo studies confirm reliance on paracrine GABA is an early CNS-acclimation strategy in breast cancer. Moreover, neuronal contact induces early resurgence in Reelin expression in tumor cells through epigenetic activation, facilitating CNS adaptation. CONCLUSION Tumor-neuron interactions allow for CNS-adaptation early in the course of brain metastasis.
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Affiliation(s)
- Krutika Deshpande
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Vahan Martirosian
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Brooke Naomi Nakamura
- Department of Medicine, Division of Gastrointestinal and Liver Diseases, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA
| | - Mukund Iyer
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Alex Julian
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Rachel Eisenbarth
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Ling Shao
- Department of Medicine, Division of Gastrointestinal and Liver Diseases, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Frank Attenello
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Josh Neman
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, USA.,USC Brain Tumor Center, University of Southern California, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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