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A cell-penetrating MARCKS mimetic selectively triggers cytolytic death in glioblastoma

Abstract

Glioblastoma (GBM) is an aggressive malignancy with limited effectiveness of standard of care therapies including surgery, radiation, and temozolomide chemotherapy necessitating novel therapeutics. Unfortunately, GBMs also harbor several signaling alterations that protect them from traditional therapies that rely on apoptotic programmed cell death. Because almost all GBM tumors have dysregulated phosphoinositide signaling as part of that process, we hypothesized that peptide mimetics derived from the phospholipid binding domain of Myristoylated alanine-rich C-kinase substrate (MARCKS) could serve as a novel GBM therapeutic. Using molecularly classified patient-derived xenograft (PDX) lines, cultured in stem-cell conditions, we demonstrate that cell permeable MARCKS effector domain (ED) peptides potently target all GBM molecular classes while sparing normal human astrocytes. Cell death mechanistic testing revealed that these peptides produce rapid cytotoxicity in GBM that overcomes caspase inhibition. Moreover, we identify a GBM-selective cytolytic death mechanism involving plasma membrane targeting and intracellular calcium accumulation. Despite limited relative partitioning to the brain, tail-vein peptide injection revealed tumor targeting in intracranially implanted GBM PDX. These results indicate that MARCKS ED peptide therapeutics may overcome traditional GBM resistance mechanisms, supporting further development of similar agents.

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Fig. 1: MARCKS ED mimetic cytotoxicity in GBM.
Fig. 2: MED2 is similarly cytotoxic to adherent or suspension cells and induces cytoplasmic retraction and Annexin-V positive blebbing.
Fig. 3: MED2 cytotoxic effects are resistant to caspase inhibition.
Fig. 4: TAT-ED mimetic triggers rapid and sustained increases in intracellular calcium in GBM as compared to NHAs.
Fig. 5: MARCKS TAT-ED mimetic binds in a punctate manner near the plasma membrane and preferentially accumulates inside GBM in vitro.
Fig. 6: MED2 crosses the blood–brain barrier concentrating in periventricular brain regions of tumor-naïve mice or orthotopic-implanted tumors.

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Data presented in this manuscript are available from the corresponding author upon request.

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Acknowledgements

A special thanks to Neil A. Durso, Ph.D. from ThermoFisher for assistance with time-lapse and calcium imaging using CellInsight Cx7 instrument. ChemoMetec loaned us the Xcyto10 image cytometer for initial work and provided microscope slides, BlueMask-1, and DAPI reagents but no financial compensation. We would also like to acknowledge the UAB Nanostring Laboratory in the Department of Radiation Oncology, directed by Eddy S. Yang, MD, PhD and managed by Debbie Della Manna, as well as the UAB Kinome Core for the molecular analyses services performed in the Supplementary data.

Funding

This work was supported by funding from the National Institutes of Health (the UAB MSTP training Grant: T32GM008361 and the UAB Training Program in Brain Tumor Biology: T32NS048039), the American Cancer Society RSG-14-071-01-TBG, the UAB Physician Scientist Training Program Medical Student Summer Research Training Program, and an intramural research grant from the UAB Department of Radiation Oncology.

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Correspondence to Christopher D. Willey.

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RTP is an employee at ChemoMetec and assisted in the use of Xcyto10, aided in Xcyto10 data analysis, and reviewed the manuscript. Unrelated to this work, but for full disclosure, CDW is a part time consultant with LifeNet Health and Varian Medical Systems.

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Eustace, N.J., Anderson, J.C., Warram, J.M. et al. A cell-penetrating MARCKS mimetic selectively triggers cytolytic death in glioblastoma. Oncogene 39, 6961–6974 (2020). https://doi.org/10.1038/s41388-020-01511-9

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