1
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Zhou B, Qin Y, Zhou J, Ruan J, Xiong F, Dong J, Huang X, Yu Z, Gao S. Bortezomib suppresses self-renewal and leukemogenesis of leukemia stem cell by NF-ĸB-dependent inhibition of CDK6 in MLL-rearranged myeloid leukemia. J Cell Mol Med 2021; 25:3124-3135. [PMID: 33599085 PMCID: PMC7957264 DOI: 10.1111/jcmm.16377] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/31/2021] [Accepted: 02/03/2021] [Indexed: 12/26/2022] Open
Abstract
Acute myeloid leukaemia (AML) with chromosomal rearrangements involving the H3K4 methyltransferase mixed‐lineage leukaemia (MLL) is an aggressive subtype with low overall survival. Bortezomib (Bort) is first applied in multiple myeloma. However, whether bort possesses anti‐self‐renewal and leukemogenesis of leukaemia stem cell (LSC) in AML with MLL rearrangements is still unclear. Here, we found that bort suppressed cell proliferation and decreased colony formation in human and murine leukaemic blasts. Besides, bort reduced the frequency and function of LSC, inhibited the progression, and extended the overall survival in MLL‐AF9 (MF9) ‐transformed leukaemic mice. Furthermore, bort decreased the percentage of human LSC (CD34+CD38‐) cells and extended the overall survival in AML blasts‐xenografted NOD/SCID‐IL2Rγ (NSG) mice. Mechanistically, cyclin dependent kinase 6 (CDK6) was identified as a bort target by RNA sequencing. Bort reduced the expressions of CDK6 by inhibiting NF ĸB recruitment to the promoter of CDK6, leading to the abolishment of NF ĸB DNA‐binding activity for CDK6 promoter. Overexpression of CDK6 partially rescued bort‐induced anti‐leukemogenesis. Most importantly, bort had little side‐effect against the normal haematological stem and progenitor cell (HSPC) and did not affect CDK6 expression in normal HSPC. In conclusion, our results suggest that bort selectively targets LSC in MLL rearrangements. Bort might be a prospective drug for AML patients bearing MLL rearrangements.
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Affiliation(s)
- Bin Zhou
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yaqian Qin
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jingying Zhou
- Department of Hematology, The Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jichen Ruan
- Department of Hematology, The Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Fang Xiong
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jinglai Dong
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xingzhou Huang
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhijie Yu
- Department of Hematology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Shenmeng Gao
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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2
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Her NG, Kesari S, Nurmemmedov E. Thrombospondin-1 counteracts the p97 inhibitor CB-5083 in colon carcinoma cells. Cell Cycle 2020; 19:1590-1601. [PMID: 32423265 DOI: 10.1080/15384101.2020.1754584] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
p97 has recently emerged as a therapeutic target for cancer due to its essential functions in protein homeostasis. CB-5083 is a first-in-class, potent and selective ATP-competitive p97 inhibitor that induces proteotoxic stress in cancer cells. Potential mechanisms regulating the sensitivity of cells to p97 inhibition remain poorly studied. Here, we demonstrate that Thrombospondin-1 (THBS1) is a CB-5083-upregulated gene that helps confer resistance of HCT116 cells to CB-5083. Our immunoblotting and immunofluorescence data showed that CB-5083 significantly increases the steady-state abundance of THBS1. Blockade of THBS1 induction sensitized cells to CB-5083-mediated growth inhibition. Suppression of THBS1 caused an increase of CB-5083-induced sub-G1 population and caspase 3/7 activity suggesting that its function is linked to the survival of cancer cells in response to p97 inhibition. Altogether our data provide new evidence that THBS1 is important for the susceptibility of cells to p97 inhibition.
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Affiliation(s)
- Nam-Gu Her
- Division of Radiation Biomedical Research, Korea Institute of Radiological and Medical Sciences , Seoul, Republic of Korea.,Department of Neuro-sciences and Neuro-therapeutics, John Wayne Cancer Institute and Pacific Neuroscience Institute at Providence Saint John's Health Center , Santa Monica, CA, USA
| | - Santosh Kesari
- Institute for Refractory Cancer Research, Current Address: Samsung Medical Center , Seoul, Republic of Korea
| | - Elmar Nurmemmedov
- Institute for Refractory Cancer Research, Current Address: Samsung Medical Center , Seoul, Republic of Korea
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3
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Tang WK, Odzorig T, Jin W, Xia D. Structural Basis of p97 Inhibition by the Site-Selective Anticancer Compound CB-5083. Mol Pharmacol 2018; 95:286-293. [PMID: 30591537 DOI: 10.1124/mol.118.114256] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 12/20/2018] [Indexed: 11/22/2022] Open
Abstract
Inhibition of p97, a key player in the ubiquitin-proteasome degradation pathway, has been proposed as a treatment of cancer. This concept was nearly realized recently when a potent p97 inhibitor, 1-[4-(benzylamino)-5H,7H,8H-pyrano[4,3-d]pyrimidin-2-yl]-2-methyl-1H-indole-4-carboxamide (CB-5083), was developed and demonstrated broad antitumor activity in various tumor models. CB-5083 functions as a competitive inhibitor that binds selectively to the ATP-binding site of the D2 domain, although both the D1 and D2 ATPase sites of p97 are highly similar. Despite its promising anticancer activity, CB-5083 failed its phase I clinical trials due to an unexpected off-target effect, which necessitates further improvement of the inhibitor. In this study, we determined the crystal structure of N-terminal domain-truncated p97 in complex with CB-5083. It provides a structural basis for the specificity of CB-5083 toward the D2 domain, offers an explanation in atomic detail for the mutations that confer resistance to CB-5083, and establishes a foundation for future structure-guided efforts to develop the next generation of p97 inhibitors.
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Affiliation(s)
- Wai Kwan Tang
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Taivan Odzorig
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Whitney Jin
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Di Xia
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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4
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Zhou L, Jiang H, Du J, Li L, Li R, Lu J, Fu W, Hou J. USP15 inhibits multiple myeloma cell apoptosis through activating a feedback loop with the transcription factor NF-κBp65. Exp Mol Med 2018; 50:1-12. [PMID: 30459344 PMCID: PMC6244212 DOI: 10.1038/s12276-018-0180-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 08/21/2018] [Accepted: 09/04/2018] [Indexed: 12/14/2022] Open
Abstract
USP15 has been shown to stabilize transcription factors, to be amplified in many cancers and to mediate cancer cell survival. However, the underlying mechanism by which USP15 regulates multiple myeloma (MM) cell proliferation and apoptosis has not been established. Here, our results showed that USP15 mRNA expression was upregulated in MM patients. USP15 silencing induced MM cell proliferation inhibition, apoptosis, and the expression of nuclear and cytoplasmic NF-κBp65, while USP15 overexpression exhibited an inverse effect. Moreover, in vivo experiments indicated that USP15 silencing inhibited MM tumor growth and NF-κBp65 expression. PDTC treatment significantly inhibited USP15 overexpression-induced cell proliferation, apoptosis inhibition, and NF-κBp65 expression. USP15 overexpression promoted NF-κBp65 expression through inhibition of its ubiquitination, whereas NF-κBp65 promoted USP15 expression as a positive regulator. Taken together, the USP15-NF-κBp65 loop is involved in MM tumorigenesis and may be a potential therapeutic target for MM. Researchers may have found a new target for treatment of multiple myeloma (MM), a common type of blood cancer. MM develops in plasma cells, white blood cells that fight infection, and is very difficult to treat. Ubiquitins, small regulatory proteins which tag proteins for destruction, have been implicated in development of many cancers. Jian Hou at Ren Ji Hospital and Weijun Fu at Changzheng Hospital, both in Shanghai, China, investigated how one ubiquitin, USP15, is involved in MM. Patients with MM showed higher levels of USP15, and MM cells supplied with additional USP15 multiplied more rapidly. Treating MM mice with USP15 inhibitors slowed tumor growth. Further investigation showed that USP15 interacts with another molecule known to be involved in development of many cancers. These results may help to develop alternative treatments for multiple myeloma.
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Affiliation(s)
- Lili Zhou
- Shanghai Jiahui International Hospital Cancer Center, Shanghai, 200233, China.,Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Hua Jiang
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Juan Du
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Lu Li
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Rong Li
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Jing Lu
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Weijun Fu
- Department of Hematology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, 200433, China.
| | - Jian Hou
- Department of Hematology, Renji Hospital affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200127, China.
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5
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Shi K, Zhang JZ, Zhao RL, Yang L, Guo D. PSMD7 downregulation induces apoptosis and suppresses tumorigenesis of esophageal squamous cell carcinoma via the mTOR/p70S6K pathway. FEBS Open Bio 2018; 8:533-543. [PMID: 29632807 PMCID: PMC5881544 DOI: 10.1002/2211-5463.12394] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 01/03/2018] [Accepted: 01/12/2018] [Indexed: 12/23/2022] Open
Abstract
PSMD7, a 19S proteasome subunit, is overexpressed in most carcinoma cells. It forms a dimer with PSMD14 that functions in the removal of attached ubiquitin chain. However, there is little knowledge about the cellular mechanism of PSMD7 and its exact biological function, especially in cancer cells. In this study, we explored the role of PSMD7 in proliferation, cell cycle, apoptosis, and proteasomal proteolysis in the esophageal squamous cell carcinoma (ESCC) cell line EC9706. Our results showed that PSMD7 was highly expressed in ESCC cells. Downregulation of PSMD7 by lentivirus‐mediated shRNA led to decreased proliferation, increased cell apoptosis, and reduced proteasomal function. Notably, lower expression level of mTOR and p70S6K and suppressed activity of mTOR/p70S6K pathway were detected after PSMD7 downregulation. By contrast, increased expression of p‐mTORSer2448 and p‐p70S6KThr421/Ser424 was discovered upon PSMD7 overexpression in Het‐1A cells. Furthermore, PSMD7 downregulation contributed to decelerated tumor growth, inhibition of proteasomal function, induced cell apoptosis and attenuated activity of mTOR/p70S6K pathway in vivo. These findings suggest that PSMD7 and the mTOR/p70S6K pathway may be a promising candidate for developing therapies for ESCC.
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Affiliation(s)
- Ke Shi
- Department of Biochemistry and Molecular Biology Henan Medical College China
| | - Jin-Zhong Zhang
- Department of Biochemistry and Molecular Biology Henan Medical College China
| | - Rui-Li Zhao
- Editorial Department of Journal of Henan University of Technology Henan University of Technology Zhengzhou China.,College of Biological Engineering Henan University of Technology Zhengzhou China
| | - Liang Yang
- Department of Microbiology and Immunology and Medicine Henan Medical College China
| | - Dan Guo
- Department of Biochemistry and Molecular Biology Henan Medical College China
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6
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Saeed L, Schmidt TH, Gensler LS, Gross AJ, Fox LP, Scharschmidt TC, Gaensler K, Naik H, Rosenblum MA, Shinkai K. Successful treatment of mucous membrane pemphigoid with bortezomib. JAAD Case Rep 2017; 4:81-83. [PMID: 29387757 PMCID: PMC5771728 DOI: 10.1016/j.jdcr.2017.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Lina Saeed
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Timothy H. Schmidt
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Lianne S. Gensler
- Division of Rheumatology, University of California San Francisco, San Francisco, California
| | - Andrew J. Gross
- Division of Rheumatology, University of California San Francisco, San Francisco, California
| | - Lindy P. Fox
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Tiffany C. Scharschmidt
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Karin Gaensler
- Division of Hematology/Oncology, University of California San Francisco, San Francisco, California
| | - Haley Naik
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Michael A. Rosenblum
- Department of Dermatology, University of California San Francisco, San Francisco, California
| | - Kanade Shinkai
- Department of Dermatology, University of California San Francisco, San Francisco, California
- Correspondence to: Kanade Shinkai, MD, PhD, University of California, San Francisco, Department of Dermatology, 1701 Divisadero Street, 3rd floor, San Francisco, CA 94115.University of California, San FranciscoDepartment of Dermatology1701 Divisadero Street3rd floorSan FranciscoCA94115
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7
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Su L, Suyila Q, Yang L, Li H, Xi Y, Su X. Bax is involved in the anticancer activity of Velcade in colorectal cancer. Exp Ther Med 2017; 14:3179-3183. [PMID: 28912868 DOI: 10.3892/etm.2017.4857] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 06/08/2017] [Indexed: 02/02/2023] Open
Abstract
Numerous chemotherapeutic agents promote tumor cell death by activating the intrinsic apoptosis signaling pathway. This pathway is regulated by mitochondrial dysfunction, which occurs through an intricate process controlled by complex interactions between B-cell lymphoma 2 (Bcl-2) family members and other cellular proteins. Bcl-2-associated X protein (Bax) is a proapoptotic protein that is an essential component of the intrinsic apoptosis signaling pathway. Patients lacking Bax may be less sensitive to chemotherapy due to an impaired intrinsic apoptosis signaling pathway. The present study demonstrated that Bax expression in colorectal cancer (CRC) tissues was typically increased compared with that in adjacent normal tissues. Furthermore, Bax-/- HCT-116 cells exhibited reduced proliferation and colony formation ability compared with Bax+/+ HCT116 cells, although the rate of apoptosis of these cells remained unchanged. However, Bax-/- HCT116 cells became more resistant to apoptosis when treated with Velcade. The results of the present study provide novel insights into the relevance of Bax expression to the prognosis of CRC.
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Affiliation(s)
- Liya Su
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
| | - Qimuge Suyila
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
| | - Ling Yang
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
| | - Hong Li
- Department of Oncology of The Affiliated People's Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
| | - Yaguang Xi
- Department of Genetics and Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Xiulan Su
- Clinical Medical Research Center of The Affiliated Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010050, P.R. China
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8
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Holbeck SL, Camalier R, Crowell JA, Govindharajulu JP, Hollingshead M, Anderson LW, Polley E, Rubinstein L, Srivastava A, Wilsker D, Collins JM, Doroshow JH. The National Cancer Institute ALMANAC: A Comprehensive Screening Resource for the Detection of Anticancer Drug Pairs with Enhanced Therapeutic Activity. Cancer Res 2017; 77:3564-3576. [PMID: 28446463 PMCID: PMC5499996 DOI: 10.1158/0008-5472.can-17-0489] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/13/2017] [Accepted: 04/24/2017] [Indexed: 12/22/2022]
Abstract
To date, over 100 small-molecule oncology drugs have been approved by the FDA. Because of the inherent heterogeneity of tumors, these small molecules are often administered in combination to prevent emergence of resistant cell subpopulations. Therefore, new combination strategies to overcome drug resistance in patients with advanced cancer are needed. In this study, we performed a systematic evaluation of the therapeutic activity of over 5,000 pairs of FDA-approved cancer drugs against a panel of 60 well-characterized human tumor cell lines (NCI-60) to uncover combinations with greater than additive growth-inhibitory activity. Screening results were compiled into a database, termed the NCI-ALMANAC (A Large Matrix of Anti-Neoplastic Agent Combinations), publicly available at https://dtp.cancer.gov/ncialmanac Subsequent in vivo experiments in mouse xenograft models of human cancer confirmed combinations with greater than single-agent efficacy. Concomitant detection of mechanistic biomarkers for these combinations in vivo supported the initiation of two phase I clinical trials at the NCI to evaluate clofarabine with bortezomib and nilotinib with paclitaxel in patients with advanced cancer. Consequently, the hypothesis-generating NCI-ALMANAC web-based resource has demonstrated value in identifying promising combinations of approved drugs with potent anticancer activity for further mechanistic study and translation to clinical trials. Cancer Res; 77(13); 3564-76. ©2017 AACR.
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Affiliation(s)
- Susan L Holbeck
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Richard Camalier
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - James A Crowell
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Jeevan Prasaad Govindharajulu
- Clinical Pharmacodynamics Program, Applied/Developmental Research Directorate, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Melinda Hollingshead
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Lawrence W Anderson
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Eric Polley
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Larry Rubinstein
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - Apurva Srivastava
- Clinical Pharmacodynamics Program, Applied/Developmental Research Directorate, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Deborah Wilsker
- Clinical Pharmacodynamics Program, Applied/Developmental Research Directorate, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Jerry M Collins
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland
| | - James H Doroshow
- Division of Cancer Treatment and Diagnosis, National Cancer Institute, NIH, Bethesda, Maryland.
- Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland
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9
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Lobo MR, Kukino A, Tran H, Schabel MC, Springer CS, Gillespie GY, Grafe MR, Woltjer RL, Pike MM. Synergistic Antivascular and Antitumor Efficacy with Combined Cediranib and SC6889 in Intracranial Mouse Glioma. PLoS One 2015; 10:e0144488. [PMID: 26645398 PMCID: PMC4672903 DOI: 10.1371/journal.pone.0144488] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 11/19/2015] [Indexed: 12/20/2022] Open
Abstract
Prognosis remains extremely poor for malignant glioma. Targeted therapeutic approaches, including single agent anti-angiogenic and proteasome inhibition strategies, have not resulted in sustained anti-glioma clinical efficacy. We tested the anti-glioma efficacy of the anti-angiogenic receptor tyrosine kinase inhibitor cediranib and the novel proteasome inhibitor SC68896, in combination and as single agents. To assess anti-angiogenic effects and evaluate efficacy we employed 4C8 intracranial mouse glioma and a dual-bolus perfusion MRI approach to measure Ktrans, relative cerebral blood flow and volume (rCBF, rCBV), and relative mean transit time (rMTT) in combination with anatomical MRI measurements of tumor growth. While single agent cediranib or SC68896 treatment did not alter tumor growth or survival, combined cediranib/SC68896 significantly delayed tumor growth and increased median survival by 2-fold, compared to untreated. This was accompanied by substantially increased tumor necrosis in the cediranib/SC68896 group (p<0.01), not observed with single agent treatments. Mean vessel density was significantly lower, and mean vessel lumen area was significantly higher, for the combined cediranib/SC68896 group versus untreated. Consistent with our previous findings, cediranib alone did not significantly alter mean tumor rCBF, rCBV, rMTT, or Ktrans. In contrast, SC68896 reduced rCBF in comparison to untreated, but without concomitant reductions in rCBV, rMTT, or Ktrans. Importantly, combined cediranib/SC68896 substantially reduced rCBF, rCBV. rMTT, and Ktrans. A novel analysis of Ktrans/rCBV suggests that changes in Ktrans with time and/or treatment are related to altered total vascular surface area. The data suggest that combined cediranib/SC68896 induced potent anti-angiogenic effects, resulting in increased vascular efficiency and reduced extravasation, consistent with a process of vascular normalization. The study represents the first demonstration that the combination of cediranib with a proteasome inhibitor substantially increases the anti-angiogenic efficacy produced from either agent alone, and synergistically slows glioma tumor growth and extends survival, suggesting a promising treatment which warrants further investigation.
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Affiliation(s)
- Merryl R. Lobo
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States of America
- Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Ayaka Kukino
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Huong Tran
- Department of Pathology, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Matthias C. Schabel
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Charles S. Springer
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States of America
| | - G. Yancey Gillespie
- Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Marjorie R. Grafe
- Department of Pathology, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Randall L. Woltjer
- Department of Pathology, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Martin M. Pike
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States of America
- Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon, United States of America
- * E-mail:
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10
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Anderson DJ, Le Moigne R, Djakovic S, Kumar B, Rice J, Wong S, Wang J, Yao B, Valle E, Kiss von Soly S, Madriaga A, Soriano F, Menon MK, Wu ZY, Kampmann M, Chen Y, Weissman JS, Aftab BT, Yakes FM, Shawver L, Zhou HJ, Wustrow D, Rolfe M. Targeting the AAA ATPase p97 as an Approach to Treat Cancer through Disruption of Protein Homeostasis. Cancer Cell 2015; 28:653-665. [PMID: 26555175 PMCID: PMC4941640 DOI: 10.1016/j.ccell.2015.10.002] [Citation(s) in RCA: 279] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 08/04/2015] [Accepted: 10/06/2015] [Indexed: 02/06/2023]
Abstract
p97 is a AAA-ATPase with multiple cellular functions, one of which is critical regulation of protein homeostasis pathways. We describe the characterization of CB-5083, a potent, selective, and orally bioavailable inhibitor of p97. Treatment of tumor cells with CB-5083 leads to accumulation of poly-ubiquitinated proteins, retention of endoplasmic reticulum-associated degradation (ERAD) substrates, and generation of irresolvable proteotoxic stress, leading to activation of the apoptotic arm of the unfolded protein response. In xenograft models, CB-5083 causes modulation of key p97-related pathways, induces apoptosis, and has antitumor activity in a broad range of both hematological and solid tumor models. Molecular determinants of CB-5083 activity include expression of genes in the ERAD pathway, providing a potential strategy for patient selection.
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Affiliation(s)
| | | | | | | | - Julie Rice
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | - Steve Wong
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | - Jinhai Wang
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | - Bing Yao
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | | | | | | | | | | | - Zhi Yong Wu
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | - Martin Kampmann
- Department of Cellular and Molecular Pharmacology and Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Yuwen Chen
- Department of Cellular and Molecular Pharmacology and Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Jonathan S Weissman
- Department of Cellular and Molecular Pharmacology and Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Blake T Aftab
- Division of Hematology & Oncology, Department of Medicine, Helen Diller Family Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | | | | | - Han-Jie Zhou
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
| | | | - Mark Rolfe
- Cleave Biosciences, Inc., Burlingame, CA 94010, USA
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11
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Abstract
Breast cancer is the most common malignancy in women and a significant cause of morbidity and mortality. Sub-types of breast cancer defined by the expression of steroid hormones and Her2/Neu oncogene have distinct prognosis and undergo different therapies. Besides differing in their phenotype, sub-types of breast cancer display various molecular lesions that participate in their pathogenesis. BRCA1 is one of the common hereditary cancer predisposition genes and encodes for an ubiquitin ligase. Ubiquitin ligases or E3 enzymes participate together with ubiquitin activating enzyme and ubiquitin conjugating enzymes in the attachment of ubiquitin (ubiquitination) in target proteins. Ubiquitination is a post-translational modification regulating multiple cell functions. It also plays important roles in carcinogenesis in general and in breast carcinogenesis in particular. Ubiquitin conjugating enzymes are a central component of the ubiquitination machinery and are often perturbed in breast cancer. This paper will discuss ubiquitin and ubiquitin-like proteins conjugating enzymes participating in breast cancer pathogenesis, their relationships with other proteins of the ubiquitination machinery and their role in phenotype of breast cancer sub-types.
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Affiliation(s)
- Ioannis A Voutsadakis
- Centre Pluridisciplinaire d'Oncologie, BH06, University Hospital of Lausanne, Lausanne, Switzerland.
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12
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Liu CY, Shiau CW, Kuo HY, Huang HP, Chen MH, Tzeng CH, Chen KF. Cancerous inhibitor of protein phosphatase 2A determines bortezomib-induced apoptosis in leukemia cells. Haematologica 2012; 98:729-38. [PMID: 22983581 DOI: 10.3324/haematol.2011.050187] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The multiple cellular targets affected by proteasome inhibition implicate a potential role for bortezomib, a first-in-class proteasome inhibitor, in enhancing antitumor activities in hematologic malignancies. Here, we examined the antitumor activity and drug targets of bortezomib in leukemia cells. Human leukemia cell lines were used for in vitro studies. Drug efficacy was evaluated by apoptosis assays and associated molecular events assessed by Western Blot. Gene silencing was performed by small interference RNA. Drug was tested in vivo in xenograft models of human leukemia cell lines and in primary leukemia cells. Clinical samples were assessed by immunohistochemical staining. Bortezomib differentially induced apoptosis in leukemia cells that was independent of its proteasome inhibition. Cancerous inhibitor of protein phosphatase 2A, a cellular inhibitor of protein phosphatase 2A, mediated the apoptotic effect of bortezomib. Bortezomib increased protein phosphatase 2A activity in sensitive leukemia cells (HL-60 and KG-1), but not in resistant cells (MOLT-3 and K562). Bortezomib's downregulation of cancerous inhibitor of protein phosphatase 2A and phospho-Akt correlated with its drug sensitivity. Furthermore, cancerous inhibitor of protein phosphatase 2A negatively regulated protein phosphatase 2A activity. Ectopic expression of CIP2A up-regulated phospho-Akt and protected HL-60 cells from bortezomib-induced apoptosis, whereas silencing CIP2A overcame the resistance to bortezomib-induced apoptosis in MOLT3 and K562 cells. Importantly, bortezomib exerted in vivo antitumor activity in HL-60 xenografted tumors and induced cell death in some primary leukemic cells. Cancerous inhibitor of protein phosphatase 2A was expressed in leukemic blasts from bone marrow samples. Cancerous inhibitor of protein phosphatase 2A plays a major role in mediating bortezomib-induced apoptosis in leukemia cells.
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Affiliation(s)
- Chun-Yu Liu
- Institute of Biopharmaceutical Sciences, National Yang-Ming Universit, Taipei, Taiwan
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