Abstract
Purpose
Previous studies have shown that the novel microtubule poison, JG-03-14, which binds to the colchicine binding site of tubulin, has the capacity to kill breast tumor cells primarily through the promotion of autophagy. The current work was designed to determine whether autophagy was, in fact, the primary mode of action as well as susceptibility to JG-03-14 in two additional tumor cell models, the B16/F10 murine melanoma cell line and the HCT-116 human colon cancer cell line.
Methods
Drug cytotoxicity was monitored based on viable cell number and clonogenic survival. Apoptosis was assessed by DAPI staining, the TUNEL assay and/or FACS analysis. Autophagy was monitored based on staining with acridine orange, redistribution and punctuation of RFP-LC3 and electron microscopy as well as p62 degradation. Senescence was evaluated based on β-galactosidase staining and alterations in cell morphology. Drug effects were also evaluated in a murine model of B16/F10 cells that localizes to the lungs while peripheral neuropathy was assessed by three complementary behavioral assays.
Results
Both HCT-116 colon cancer cells and B16/F10 melanoma cells were sensitive to JG-03-14 in that the drug demonstrated tumor cell killing. However, there was minimal induction of apoptosis. In contrast, there was clear evidence for autophagy and autophagic flux while the residual surviving cells appeared to be in a state of irreversible senescence. Inhibition of drug-induced autophagy in either the melanoma cells or the colon carcinoma cells was only slightly protective as the cells instead died by apoptosis. JG-03-14 reduced the size of tumor nodules in mice lungs; furthermore, the drug did not promote peripheral neuropathy.
Conclusions
Taken together with evidence for its actions as a vascular disrupting agent, these observations support the potential utility of JG-03-14 to effectively treat malignancies that might be resistant to conventional chemotherapy through evasion of apoptosis.
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Notes
Prior to the combination treatment studies, the toxicity of 3-methyladenine (3-MA), wortmannin, LY-249004, bafilomycin A-1 and chloroquine, all of which have been shown to inhibit autophagy in a variety of experimental systems [44–46], was examined in the B16/F10 and HCT-116 cell lines. Bafilomycin was chosen for the studies in the B16/F10 cells, and chloroquine was chosen for studies in the HCT-116 cells based on the fact that these agents exhibited minimal toxicity at concentrations where autophagy inhibition was evident.
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Acknowledgments
This work was supported, in part, by NIH Grant # 2R15 CA067236-04 to Dr. John Gupton and NIH Grant # RO1 CA135043-01A1 to Dr. David Gewirtz. Electron microscopy was performed at the VCU—Department of Neurobiology and Anatomy Microscopy Facility, supported, in part, with funding from NIH-NINDS Center core grant P30NS047463. We acknowledge the support of the Flow cytometry shared resource facility supported in part by NIH Grant P30CA16059. We are grateful to the Anatomic Pathology Research Services for the histology work. The RFP-LC3 vector was generously provided by Dr. Keith Miskimins at the University of South Dakota and was originally developed by the laboratory of Dr. A.M. Tolkovsky. We are grateful to Dr. Fiorenza Ianzini at the University of Iowa for guidance with the assessment of mitotic catastrophe.
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Biggers, J.W., Nguyen, T., Di, X. et al. Autophagy, cell death and sustained senescence arrest in B16/F10 melanoma cells and HCT-116 colon carcinoma cells in response to the novel microtubule poison, JG-03-14. Cancer Chemother Pharmacol 71, 441–455 (2013). https://doi.org/10.1007/s00280-012-2024-6
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DOI: https://doi.org/10.1007/s00280-012-2024-6