Abstract
Brain tumor initiating cells (BTICs) co-opt the neuronal high affinity glucose transporter, GLUT3, to withstand metabolic stress. We investigated another mechanism critical to brain metabolism, mitochondrial morphology, in BTICs. BTIC mitochondria were fragmented relative to non-BTIC tumor cell mitochondria, suggesting that BTICs increase mitochondrial fission. The essential mediator of mitochondrial fission, dynamin-related protein 1 (DRP1), showed activating phosphorylation in BTICs and inhibitory phosphorylation in non-BTIC tumor cells. Targeting DRP1 using RNA interference or pharmacologic inhibition induced BTIC apoptosis and inhibited tumor growth. Downstream, DRP1 activity regulated the essential metabolic stress sensor, AMP-activated protein kinase (AMPK), and targeting AMPK rescued the effects of DRP1 disruption. Cyclin-dependent kinase 5 (CDK5) phosphorylated DRP1 to increase its activity in BTICs, whereas Ca2+-calmodulin-dependent protein kinase 2 (CAMK2) inhibited DRP1 in non-BTIC tumor cells, suggesting that tumor cell differentiation induces a regulatory switch in mitochondrial morphology. DRP1 activation correlated with poor prognosis in glioblastoma, suggesting that mitochondrial dynamics may represent a therapeutic target for BTICs.
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Acknowledgements
We appreciate flow cytometry assistance from C. Shemo and S. O'Bryant, and the tissue provided by M. McGraw, the Cleveland Clinic Foundation Tissue Procurement Service and A.E. Sloan (University Hospitals). I. Nakano (Ohio State University) kindly provided the IN528 model. We thank members of the Rich laboratory for critical reading of the manuscript and discussions. We thank A. Janocha for help with using the Seahorse XF Extracellular Flux Analyzer. Special thanks to D. Napier for her histologic expertise. Finally, we thank our funding sources: US National Institutes of Health grants CA154130, CA169117, CA171652, NS087913, NS089272 (J.N.R.), and CA155764, 2P20 RR020171 COBRE pilot grant (C.M.H.) and NS070315 (S.B.); the Research Programs Committees of Cleveland Clinic (J.N.R.); and the James S. McDonnell Foundation (J.N.R.). C.M.H. was supported by the Peter and Carmen Lucia Buck Training Program in Translational Clinical Oncology and the University of Kentucky College of Medicine Physician Scientist Program. The Markey Biospecimen and Tissue Procurement (BSTP) Shared Resource Facility facilitated the construction of tissue microarrays and immunohistochemical studies. The BSTP Shared Resource Facility is supported by the University of Kentucky Markey Cancer Center (P30CA177558).
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Q.X. and J.N.R. designed the experiments, analyzed data and prepared the manuscript. Q.X., Q.W., K.Y.,W.Z., S.M.D., Z.H., X.F. and A.N.F. performed the experiments. W.A.F. and Y.S. performed database analyses. C.M.H. performed pathologic analyses. S.B. and D.F.K. provided scientific input and helped to edit the manuscript.
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Integrated supplementary information
Supplementary Figure 1 Total protein levels of mitochondrial dynamic mediators are not differentially expressed by brain tumor initiating cells.
Total levels of mitochondrial dynamic regulators do not differ within the glioma hierarchy. Immunoblot analysis of DRP1, MFN1, MFN2, and OPA1 in brain tumor initiating cells (BTICs) and non-BTICs isolated from multiple patient-derived glioblastoma xenografts (4302, 387, 3565, and IN528). Images were cropped for presentation. Full-length blots are presented in Supplementary Fig. 12.
Supplementary Figure 2 DRP1 targeting has less minimal effects on non-brain tumor initiating cells and neuroprogenitors.
a, b. Effects of DRP1 knockdown with two independent shRNA constructs on cell proliferation in 387 non-brain tumor initiating cells (non-BTICs) and the ENSA human neural progenitor cell (NPC) line.
Supplementary Figure 3 Mdivi-1 treatment induces tubular mitochondrial morphology.
a. Immunofluorescent staining of the mitochondrial marker TOM20 in 387 and 3565 BTICs treated with DMSO or Mdivi-1. Data are represented as mean ± s.e.m. (387: fragmented, p = 0.0032; tubular, p = 0.0010. 3565: fragmented, p = 0.0092; tubular, p = 0.0015 by Student’s t-test; n = 3). b. Analysis of tumor mitochondrial morphology treated in vivo with Mdivi-1. 16 days after tumor implantation, immunocompromised mice bearing orthotopic 387 BTICs (3 × 105 cells/animal) were treated with Midivi-1 (2.5 mg/kg) or DMSO vehicle control. Mitochondria morphology of brain tumor tissue was assessed by Transmission electron microscopy. At least 30 mitochondria were analyzed per experiment. Scale bars indicate 1 µm. Data are presented as mean ± s.e.m. (p = 0.0353 by Student’s t-test; n = 3).
Supplementary Figure 4 Activation of AMPK inhibits proliferation and promotes apoptosis in brain tumor initiating cells.
a. Continuous measurement of oxygen consumption rate (OCR) of BTICs (T387) expressing non-targeting (NT) control shRNA, shDrp1#1, or shDrp1#2 was performed with the Seahorse system. Data are shown as mean ± s.e.m. (shDrp1#1: p = 0.0022; shDrp1#2: p = 0.0012 by Student’s t-test; n = 3). b. Effects of treatment with the selective AMPK activator AICAR on cell proliferation in 387 brain tumor-initiating cells (BTICs). Data are shown as mean ± s.e.m. (shDrp1#1: p = 0.0022; shDrp1#2: p = 0.0012 by repeated measures ANOVA; n = 3). c. Immunoblot shows increased cleaved PARP following AICAR treatment of 387 BTICs. Images were cropped for presentation. Full-length blots are presented in Supplementary Fig. 12.
Supplementary Figure 5 Cyclin-dependent kinase 5 (CDK5) inhibition reprograms BTIC mitochondrial morphology.
a. Immunofluorescent staining of the mitochondrial marker TOM20 in 387 and 3565 BTICs treated with DMSO, Roscovitine or BMS-265246. b. Data are represented as mean ± s.e.m. (387: roscovitine: fragmented, p = 0.0041; tubular, p = 0.0010. 3565, roscovitine: fragmented, p = 0.0049; tubular: p = 0.0017 by Student’s t-test; n = 3).
Supplementary Figure 6 Cyclin-dependent kinase 5 (CDK5) maintains brain tumor initiating cells (BTICs).
a. Effects of CDK5 knockdown with two independent lentiviral shRNA constructs on cell proliferation in two BTIC models. Data are represented as mean ± s.e.m. (387, p < 0.0001; 3565, p < 0.0001 by repeated measures ANOVA; n = 4). b. In vitro extreme limiting dilution assays (ELDA) to single cells demonstrate that knockdown of CDK5 in two BTIC models decreases the frequency of tumorsphere formation (387: p = 3.4 × 10−13; 3565: p = 2.2 × 10−8 by ANOVA). c. Proposed model of CDK5 regulation of DRP1 in BTICs.
Supplementary Figure 7 Ca2+–calmodulin-dependent protein kinase 2 (CAMK2) inhibits DRP1 in non-brain tumor initiating cells.
a. Lysates of 387 non-brain tumor initiating cells (non-BTICs) treated with the pan-CAMK inhibitor KN93 or DMSO vehicle control were immunoblotted with the indicated antibodies. Images were cropped for presentation. Full-length blots are presented in Supplementary Fig. 12. b. Lysates of 387 NSTCs treated Autocamtide-2-Related Inhibitory Peptide (AIP), a CAMK2 specific inhibitor, or ddH2O vehicle control were immunoblotted with the indicated antibodies. c. Immunoblot analysis of CAMK1, CAMK2, stem and differentiation markers in BTICs and non-BTICs isolated from multiple patient-derived glioma xenografts (4302, 387, and 3565). d. Immunofluorescent staining of TOM20 in 387 and 3565 non-BTICs treated with AIP or ddH2O vehicle control. Data are represented as mean ± s.e.m. (387: fragmented, p = 0.0028; tubular, p = 0.0050. 3565: fragmented, p = 0.0036; tubular, p = 0.0031 by Student’s t-test; n = 3). e. Proposed model of DRP1 regulation in non-BTICs by CAMK2.
Supplementary Figure 8 Multivariate analysis of AMPK, CDK5 and CAMK2 informs poor prognosis across mixed-grade gliomas.
Analysis of REMBRANDT data indicates that low AMPK + high CDK5 + low CAMK2 mRNA expression correlates with poor glioma patient survival. Top: p < 0.0001; bottom: p = 0.0002 by log-rank analysis.
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Xie, Q., Wu, Q., Horbinski, C. et al. Mitochondrial control by DRP1 in brain tumor initiating cells. Nat Neurosci 18, 501–510 (2015). https://doi.org/10.1038/nn.3960
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DOI: https://doi.org/10.1038/nn.3960
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