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Ganjibakhsh M, Monshizadeh R, Nasimian A, Aminishakib P, Farzaneh P, Tavakoli Shiraji S, Gharajei A, Rahrotaban S, Baghaei F, Gohari NS. Anti-angiogenic efficacy of aflibercept and bevacizumab in primary oral squamous cell carcinoma cells. J Oral Pathol Med 2018; 47:575-582. [PMID: 29672933 DOI: 10.1111/jop.12717] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/12/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND In recent decades, anti-angiogenic treatment strategy has been well described in cancer treatment. The anti-angiogenic activity of both bevacizumab and aflibercept has been researched on 10 previously established primary oral squamous cell carcinoma (OSCC) cells of an Iranian population with different levels of purity, in an attempt to find the most effective anti-angiogenic-targeted drug. METHODS To investigate and compare the effect of bevacizumab and aflibercept on vascular endothelial growth factor (VEGF) secretion of 10 primary OSCC cells, cell proliferation and viability were assessed by ELISA and MTT assays. In addition, cell migration was studied using scratch assay. RESULTS The results showed that VEGF impressively expressed in all primary cancer cells. Although both drugs significantly reduced the secretion of VEGF, the effect of aflibercept was more prominent. Also, bevacizumab-treated cells migration was lower than the control group and the cells treated with aflibercept showed the lowest migration rate compared to bevacizumab and control groups. CONCLUSION The anti-angiogenic-targeted drugs, especially Af, might be effective in treatment of patients with OSCC in combination with conventional surgical treatments.
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Affiliation(s)
- Meysam Ganjibakhsh
- Human and Animal Cell Bank, Iranian Biological Resource Center (IBRC), ACECR, Tehran, Iran
| | - Roshanak Monshizadeh
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Ahmad Nasimian
- Department of Clinical Biochemistry, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Pouyan Aminishakib
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.,Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Parvaneh Farzaneh
- Human and Animal Cell Bank, Iranian Biological Resource Center (IBRC), ACECR, Tehran, Iran
| | - Sahar Tavakoli Shiraji
- Hematology, Oncology and SCT Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Ata Gharajei
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.,Department of Head and Neck Surgical Oncology and Reconstructive Surgery, The Cancer Institute, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Sedigheh Rahrotaban
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Fereshteh Baghaei
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Neda Sadat Gohari
- Human and Animal Cell Bank, Iranian Biological Resource Center (IBRC), ACECR, Tehran, Iran
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Fan Y, Weng Z, Gao H, Hu J, Wang H, Li L, Liu H. Isoalantolactone Enhances the Radiosensitivity of UMSCC-10A Cells via Specific Inhibition of Erk1/2 Phosphorylation. PLoS One 2015; 10:e0145790. [PMID: 26716456 PMCID: PMC4696678 DOI: 10.1371/journal.pone.0145790] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 12/08/2015] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Although radiotherapy is one of the mainstream approaches for the treatment of head and neck squamous cell carcinoma (HNSCC), this cancer is always associated with resistance to radiation. In this study, the mechanism of action of isoalantolactone as well as its radiosensitizing effect was investigated in UMSCC-10A cells. METHODS The radiosensitization of UMSCC-10A cells treated with isoalantolactone was analyzed by colony formation assay. The radiosensitization effects of isoalantolactone on cell proliferation, cell cycle and apoptosis regulation were examined by BrdU incorporation assay, DNA content assay and flow cytometry, respectively. Western blotting was performed to determine the effects of isoalantolactone combined with radiation on the protein expression of Mek, extracellular signal-regulated kinase (Erk1/2) as well as phosphorylated Mek and Erk1/2. Erk1/2 knockdown by siRNA was used to confirm that isoalantolactone specifically inhibited the activation of Erk1/2 signaling pathway in UMSCC-10A cells. RESULTS Isoalantolactone enhanced the radiosensitivity of UMSCC-10A cells; the sensitivity enhanced ratios (SERs) were 1.44 and 1.63, respectively, for 2.5 and 5 μM. Moreover, isoalantolactone enhanced radiation-induced cell proliferation and apoptosis and cell cycle arrested at G2/M phase. Furthermore, no marked changes were observed in the expression of total Erk1/2 and Mek protein after radiation treatment. However, isoalantolactone was significantly reduced radiation-induced the phosphorylation of Erk1/2, whereas it altered the phosphorylation of Mek to a lesser extent. In addition, the radiosensitivity of UMSCC-10A cells with Erk1/2 knockdown was increased. Isoalantolactone cannot further prevent the proliferation of UMSCC-10A cells with Erk1/2 knockdown which other mechanism regulated cell proliferation. CONCLUSION Our results suggested that isoalantolactone enhanced radiation-induced apoptosis, cell cycle arrested and reduced the cell proliferation of UMSCC-10A cells via specifically inhibited the phosphorylation of Erk1/2. Thus a low concentration of isoalantolactone may be used to overcome the resistance of UMSCC-10A cells to radiation and may be a promising radiosensitizer in cancer therapy.
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Affiliation(s)
- Yonggang Fan
- Department of Cell Biology, Liaoning Medical University, Jinzhou, Liaoning, China
| | - Zhiyong Weng
- Department of Cell Biology, Liaoning Medical University, Jinzhou, Liaoning, China
| | - Hongguo Gao
- Department of clinical laboratory, Daqing oilfield general hospital, Daqing, Heilongjiang, China
| | - Jiehua Hu
- Information Center, Logistics college, Naval University of Engineering, Tanggu, Tianjin, China
| | - Hongyan Wang
- Department of clinical laboratory, Daqing oilfield general hospital, Daqing, Heilongjiang, China
| | - Lihua Li
- Department of Cell Biology, Liaoning Medical University, Jinzhou, Liaoning, China
| | - Hua Liu
- Department of Cell Biology, Liaoning Medical University, Jinzhou, Liaoning, China
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Cui Y, Zhang C, Li X, Liu H, Yin B, Xu T, Zhang Y, Wang D. Intravoxel Incoherent Motion Diffusion-weighted Magnetic Resonance Imaging for Monitoring the Early Response to ZD6474 from Nasopharyngeal Carcinoma in Nude Mouse. Sci Rep 2015; 5:16389. [PMID: 26574153 PMCID: PMC4648100 DOI: 10.1038/srep16389] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 10/14/2015] [Indexed: 01/02/2023] Open
Abstract
Early therapeutic effects of anti-angiogenic agent ZD6474 upon nasopharyngeal carcinoma (NPC) in nude mouse were monitored by using intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI). Mice bearing NPC underwent IVIM DWI at baseline and after 1, 3, and 7 days of treatment with ZD6474 or vehicle (n = 12 per group). Parameters of apparent diffusion coefficient (ADC), true diffusion coefficient (D), perfusion fraction (f), and blood pseudodiffusion coefficient (D*) at different time points were compared between the two groups or within the treated group. In the treated group, the perfusion-related parameters f and D* of the tumors decreased significantly on day 1 while the diffusion-related parameters ADC and D were significantly higher beginning on day 3 compared with the control group. The decreases in f on day 1 and D* on day 3 were moderately correlated with the smaller tumor size change on day 7. Moderate correlations were established between MVD and f and D* as well as between increased TUNEL or decreased Ki-67 index and ADC and D. This study supports that IVIM DWI is sensitive to detect the ZD6474-induced changes in NPC in nude mouse and the f parameter could predict early response to anti-angiogenic treatment.
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Affiliation(s)
- Yanfen Cui
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Caiyuan Zhang
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Xiaoming Li
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Huanhuan Liu
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Bing Yin
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Tianyong Xu
- MR Advanced Application and Research Center, GE Healthcare China, Shanghai 201203, China
| | - Yong Zhang
- MR Advanced Application and Research Center, GE Healthcare China, Shanghai 201203, China
| | - Dengbin Wang
- Department of Radiology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
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Lange L, Keppner-Witter S, Grigat J, Spänkuch B. Combinatorial inhibition of Plk1 and PKCβ in cancer cells with different p53 status. Oncotarget 2014; 5:2263-75. [PMID: 24810255 PMCID: PMC4039161 DOI: 10.18632/oncotarget.1897] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 04/11/2014] [Indexed: 01/23/2023] Open
Abstract
PKCβ and Plk1 are fascinating targets in cancer therapy. Therefore, we combined Enzastaurin targeting PKCβ and SBE13 targeting Plk1 to test synergistic effects in cells with different p53 status. We analyzed cell proliferation and apoptosis induction, and did Western blot and FACScan analyses to examine the combined PKCβ and Plk1 inhibition. p53-wild-type cells are more resistant to the combinatorial treatment than p53-deficient cells, which displayed a synergistic reduction of cell proliferation after the combination. HeLa, MCF-7 and HCT116(p53wt) and HCT116(p53-/-) cells differed in their cell cycle distribution after combinatorial treatment in dependence on a functional p53-dependent G1/S checkpoint (p53-deficient cells showed an enrichment in S and G2/M, p53-wild-type cells in G0/G1 phase). hTERT-RPE1 cells did not show the synergistic effects of cancer cells. Thus, we demonstrate for the first time that Plk1 inhibition using SBE13 enhances the effects of Enzastaurin in cancer cells. HCT116(p53wt) and HCT116(p53-/-) cells confirmed the p53-dependence of different effects after Plk1 and PKCβ inhibition observed in HeLa and MCF-7 cells. Obviously, p53 protects cells from the cytotoxicity of Enzastaurin in combination with SBE13. For that reason this combination can be useful to treat p53-deficient cancers, without displaying toxicity to normal cells, which all have functional p53.
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Affiliation(s)
- Lisa Lange
- Friedrich-Schiller-University, CMB, Institute for Biochemistry, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Sarah Keppner-Witter
- Eberhard-Karls-University, Department of Gynecology, Calwer Straße 7, 72076 Tübingen, Germany
| | - Juline Grigat
- Department of Obstetrics and Gynecology, Medical School, Goethe-University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Birgit Spänkuch
- Friedrich-Schiller-University, CMB, Institute for Biochemistry, Hans-Knöll-Straße 2, 07745 Jena, Germany
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Hsu HW, de Necochea-Campion R, Williams V, Duerksen-Hughes PJ, Simental AA, Ferris RL, Chen CS, Mirshahidi S. Linifanib (ABT-869), enhances cytotoxicity with poly (ADP-ribose) polymerase inhibitor, veliparib (ABT-888), in head and neck carcinoma cells. Oral Oncol 2014; 50:662-9. [PMID: 24735547 DOI: 10.1016/j.oraloncology.2014.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/19/2014] [Accepted: 03/22/2014] [Indexed: 11/17/2022]
Abstract
OBJECTIVES PARP inhibitors (PARPi) may provide an opportunity to gain selective killing of tumor cells which have deficiencies in cellular DNA repair systems. We previously demonstrated linifanib (ABT-869), a multi-receptor tyrosine kinase inhibitor of VEGF and PDGF receptor families, radiosensitized Head and Neck Squamous Cell Carcinoma cells (HNSCC) via inhibiting STAT3 activation. Given that STAT3 can modulate DNA damage response (DDR) pathway, in this study, we evaluate the effects of linifanib to enhance cytotoxicity with the PARPi, veliparib (ABT-888), in HNSCC. MATERIALS AND METHODS UMSCC-22A and UMSCC-22B cells were treated with linifanib (ABT-869) and veliparib (ABT-888). Cell viability, cytotoxicity, apoptosis induction, DNA single strand break (SSB) and double strand break (DSB) damages were examined by MTT assay, colony formation assay, flow cytometry and comet assay. In addition, the expression of DNA homologous recombination repair protein Rad51, γH2AX, a double strand break marker and cleaved PARP, an apoptotic cell death marker, were assessed using western immunoblotting. RESULTS Combination treatment resulted in more cell growth inhibition, induction of apoptosis, DNA damages and double strand breaks, lower expression of Rad51, increase γH2AX expression and PARP cleavage. CONCLUSION These data suggest the possibility of combining targeted therapeutic such as linifanib with veliparib to augment the inhibition of cell growth and apoptosis via synthetic lethality in HNSCC cells. Thus, it may provide a novel therapeutic strategy and improve efficacy and outcome in HNSCC.
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Affiliation(s)
- Heng-Wei Hsu
- Department of Pharmacology, Loma Linda University, Loma Linda, CA, USA; Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA
| | - Rosalia de Necochea-Campion
- LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA; Division of Oncology & Hematology, Loma Linda University, Loma Linda, CA, USA
| | - Vonetta Williams
- Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA
| | | | - Alfred A Simental
- Department of Otolaryngology and Head/Neck Surgery, Loma Linda University, Loma Linda, CA, USA
| | - Robert L Ferris
- Department of Otolaryngology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Chien-Shing Chen
- Department of Medicine, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA; Division of Oncology & Hematology, Loma Linda University, Loma Linda, CA, USA
| | - Saied Mirshahidi
- Department of Medicine, Loma Linda University, Loma Linda, CA, USA; Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA.
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Hsu HW, Wall NR, Hsueh CT, Kim S, Ferris RL, Chen CS, Mirshahidi S. Combination antiangiogenic therapy and radiation in head and neck cancers. Oral Oncol 2013; 50:19-26. [PMID: 24269532 DOI: 10.1016/j.oraloncology.2013.10.003] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 09/24/2013] [Accepted: 10/02/2013] [Indexed: 02/02/2023]
Abstract
Tumor angiogenesis is a hallmark of advanced cancers and promotes invasion and metastasis. Over 90% of head and neck squamous cell carcinomas (HNSCC) express angiogenic factors such as vascular endothelial growth factor (VEGF). Several preclinical studies support the prognostic implications of angiogenic markers for HNSCC and currently this is an attractive treatment target in solid tumors. Since radiotherapy is one of the most commonly used treatments for HNSCC, it is imperative to identify the interactions between antiangiogenic therapy and radiotherapy, and to develop combination therapy to improve clinical outcome. The mechanisms between antiangiogenic agents and ionizing radiation are complicated and involve many interactions between the vasculature, tumor stroma and tumor cells. The proliferation and metastasis of tumor cells rely on angiogenesis/blood vessel formation. Rapid growing tumors will cause hypoxia, which up-regulates tumor cell survival factors, such as hypoxia-inducing factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF), giving rise to more tumor proliferation, angiogenesis and increased radioresistance. Thus, agents that target tumor vasculature and new tumor vessel formation can modulate the tumor microenvironment to improve tumor blood flow and oxygenation, leading to enhanced radiosensitivity. In this review, we discuss the mechanisms of how antiangiogenic therapies improve tumor response to radiation and data that support this combination strategy as a promising method for the treatment of HNSCC in the future.
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Affiliation(s)
- Heng-Wei Hsu
- Department of Pharmacology, Loma Linda University, Loma Linda, CA, USA; Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA
| | - Nathan R Wall
- Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA; Department of Biochemistry, Loma Linda University, Loma Linda, CA, USA
| | - Chung-Tsen Hsueh
- Division of Oncology & Hematology, Loma Linda University, Loma Linda, CA, USA
| | - Seungwon Kim
- Department of Otolaryngology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Robert L Ferris
- Department of Otolaryngology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Chien-Shing Chen
- Department of Medicine, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA; Division of Oncology & Hematology, Loma Linda University, Loma Linda, CA, USA
| | - Saied Mirshahidi
- Department of Medicine, Loma Linda University, Loma Linda, CA, USA; Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA; LLU Cancer Center Biospecimen Laboratory, Loma Linda University, Loma Linda, CA, USA.
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Saba NS, Levy LS. Protein kinase C-beta inhibition induces apoptosis and inhibits cell cycle progression in acquired immunodeficiency syndrome-related non-hodgkin lymphoma cells. J Investig Med 2013; 60:29-38. [PMID: 21997316 DOI: 10.2310/jim.0b013e318237eb55] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Acquired immunodeficiency syndrome (AIDS)-related non-Hodgkin lymphoma (NHL) constitutes an aggressive variety of lymphomas characterized by increased extranodal involvement, relapse rate, and resistance to chemotherapy. Protein kinase C-beta (PKCβ) targeting showed promising results in preclinical and clinical studies involving a wide variety of cancers, but studies describing the role of PKCβ in AIDS-NHL are primitive if not lacking. METHODS In the present study, 3 AIDS-NHL cell lines were examined: 2F7 (AIDS-Burkitt lymphoma), BCBL-1 (AIDS-primary effusion lymphoma), and UMCL01-101 (AIDS-diffuse large B-cell lymphoma). RESULTS Immunoblot analysis demonstrated expression of PKCβ1 and PKCβ2 in 2F7 and UMCL01-101 cells, and PKCβ1 alone in BCBL-1 cells. The viability of 2F7 and BCBL-1 cells decreased significantly in the presence of PKCβ-selective inhibitor at half-maximal inhibitory concentration of 14 and 15 μmol/L, respectively, as measured by tetrazolium dye reduction assay. In contrast, UMCL01-101 cells were relatively resistant. As determined using flow cytometric deoxynucleotidyl transferase dUTP nick-end labeling assay with propidium iodide staining, the responsiveness of sensitive cells was associated with apoptotic induction and cell cycle inhibition. Protein kinase C-beta-selective inhibition was observed not to affect AKT phosphorylation but to induce a rapid and sustained reduction in the phosphorylation of glycogen synthase kinase-3 beta, ribosomal protein S6, and mammalian target of rapamycin in sensitive cell lines. CONCLUSIONS The results indicate that PKCβ plays an important role in AIDS-related NHL survival and suggest that PKCβ targeting should be considered in a broader spectrum of NHL. The observations in BCBL-1 were unexpected in the absence of PKCβ2 expression and implicate PKCβ1 as a regulator in those cells.
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Affiliation(s)
- Nakhle S Saba
- Section of Hematology and Medical Oncology, Department of Medicine, Tulane University School of Medicine, New Orleans, LA, USA
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Linifanib (ABT-869) enhances radiosensitivity of head and neck squamous cell carcinoma cells. Oral Oncol 2013; 49:591-7. [PMID: 23490884 DOI: 10.1016/j.oraloncology.2013.02.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 02/05/2013] [Accepted: 02/14/2013] [Indexed: 11/23/2022]
Abstract
OBJECTIVES Novel targeted therapeutic strategies to overcome radio-resistance of cancer cells traditionally treated with radiation may improve patient survival with the added benefit of reduced systemic toxicity. Herein, we tested the feasibility of Linifanib (ABT-869), a multi-receptor tyrosine kinase inhibitor of members of vascular endothelial growth factor (VEGF) and platelet derived growth factor (PDGF) receptor families, on radio-sensitization of Head and Neck Squamous Cell Carcinoma (HNSCC). MATERIALS AND METHODS UMSCC-22A and UMSCC-22B cells were treated with Linifanib and γ-radiation response was determined. Cell viability, cytotoxicity, apoptosis induction and cell cycle distribution were examined by MTT assay, colony formation assay and flow cytometry. In addition, expression of STAT3 and downstream signaling proteins were assessed using western immunoblotting. RESULTS Treatment with Linifanib resulted in cell growth inhibition, G2/M cell cycle arrest, induction of cell death via apoptosis, reduced phosphorylation of STAT3, which has been linked to radio-resistance, lower expression of cyclin D1, survivin and increased PARP cleavage. In addition, Linifanib overcame the radio-resistance of the cell lines and significantly enhanced radiation-induced cytotoxicity (p<0.05). CONCLUSION These data suggest the possibility of combining targeted therapeutic such as Linifanib with radiation to enhance inhibition of cell growth and apoptosis in HNSCC cells. Thus, it may provide a novel therapeutic strategy and improve efficacy of radiation against HNSCC in the future.
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Hoang B, Reilly RM, Allen C. Block copolymer micelles target Auger electron radiotherapy to the nucleus of HER2-positive breast cancer cells. Biomacromolecules 2012; 13:455-65. [PMID: 22191486 DOI: 10.1021/bm201479t] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Intracellular trafficking of Auger electron emitting radionuclides to perinuclear and nuclear regions of cells is critical to realizing their full therapeutic potential. In the present study, block copolymer micelles (BCMs) were labeled with the Auger electron emitter indium-111 ((111)In) and loaded with the radiosensitizer methotrexate. HER2 specific antibodies (trastuzumab fab) and nuclear localization signal (NLS; CGYGPKKKRKVGG) peptides were conjugated to the surface of the BCMs to direct uptake in HER2 expressing cells and subsequent localization in the cell nucleus. Cell uptake and intracellular distribution of the multifunctional BCMs were evaluated in a panel of breast cancer cell lines with different levels of HER2 expression. Indeed cell uptake was found to be HER2 density dependent, confirming receptor-mediated internalization of the BCMs. Importantly, conjugation of NLS peptides to the surface of BCMs was found to result in a significant increase in nuclear uptake of the radionuclide (111)In. Successful nuclear targeting was shown to improve the antipoliferative effect of the Auger electrons as measured by clonogenic assays. In addition, a significant radiation enhancement effect was observed by concurrent delivery of low-dose MTX and (111)In in all breast cancer cell lines evaluated.
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Affiliation(s)
- Bryan Hoang
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario, Canada M5S 3M2
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