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  1. Article ; Online: Inhibition of SUMOylation promotes remyelination and reduces IL-17 mediated autoimmune inflammation: Novel approach toward treatment of inflammatory CNS demyelinating disease.

    Kim, Kwang Woon / Ljunggren-Rose, Åsa / Matta, Pranathi / Toki, Shinji / Sriram, Subramaniam

    Journal of neuroimmunology

    2023  Volume 384, Page(s) 578219

    Abstract: Small ubiquitin like modifiers (SUMO) are reversible posttranslational modifiers of intracellular proteins. In the CNS, expression of myelin genes is regulated by state of SUMOylation of their respective transcription factors. In the immune system, ... ...

    Abstract Small ubiquitin like modifiers (SUMO) are reversible posttranslational modifiers of intracellular proteins. In the CNS, expression of myelin genes is regulated by state of SUMOylation of their respective transcription factors. In the immune system, deSUMOylation activates innate immune responses and promotes anti-viral immunity. However, the role played by SUMO in an adaptive immune response and in the development of T cell mediated autoimmune disease has not been previously described. TAK981 is a synthetic small molecule which by forming adducts with SUMO proteins prevents SUMOylation. We examined the expression of myelin genes and their transcription factors following culture with TAK981 in Oligodendrocyte Precursor Cells (OPC). We found that myelin basic protein (MBP), a key myelin protein, is upregulated in OPC in the presence of TAK981. We also found increased expression of transcription factors Sox10 and Myrf, which engage in the expression of MBP. In the Cuprizone model of demyelination/remyelination, animals which were treated with TAK981 showed increased remyelination in areas of demyelination and an increase in the number of maturing oligodendrocytes compared to vehicle treated controls. In in vitro cultures of lymphocytes, TAK981 reduced the expression of TH17 in T cells in mice immunized with MOGp35-55. Following in vivo treatment with TAK981, there was a significant reduction in the clinical and pathological severity in mice immunized to develop experimental allergic encephalitis (EAE). The dual effects of deSUMOylation on remyelination and in regulating an autoimmune adaptive response offers a novel approach to the management of human inflammatory demyelinating diseases such as multiple sclerosis.
    MeSH term(s) Mice ; Humans ; Animals ; Demyelinating Diseases/chemically induced ; Demyelinating Diseases/drug therapy ; Demyelinating Diseases/metabolism ; Remyelination/physiology ; Sumoylation ; Interleukin-17 ; Cell Differentiation ; Myelin Sheath/pathology ; Oligodendroglia/metabolism ; Cuprizone/toxicity ; Inflammation/drug therapy ; Inflammation/metabolism ; Central Nervous System Diseases/metabolism ; Transcription Factors/metabolism ; Mice, Inbred C57BL ; Disease Models, Animal
    Chemical Substances Interleukin-17 ; Cuprizone (5N16U7E0AO) ; Transcription Factors
    Language English
    Publishing date 2023-10-04
    Publishing country Netherlands
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 8335-5
    ISSN 1872-8421 ; 0165-5728
    ISSN (online) 1872-8421
    ISSN 0165-5728
    DOI 10.1016/j.jneuroim.2023.578219
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Overexpression of microRNA-145 inhibits tumorigenesis through autophagy in chemotherapy and radiation resistant neuroblastoma cells.

    Kim, Kwang Woon / Qiao, Jingbo / Kim, Julia Y / Park, Kyungho / Chung, Dai H

    Oncoscience

    2020  Volume 7, Issue 1-2, Page(s) 1–9

    Abstract: MicroRNA-145 (miR-145) plays a suppressive role in the process of tumorigenesis and an important role in induction of autophagy. However, the exact role of miR-145 in therapeutically resistant neuroblastoma cells remain elusive. Herein, we sought to ... ...

    Abstract MicroRNA-145 (miR-145) plays a suppressive role in the process of tumorigenesis and an important role in induction of autophagy. However, the exact role of miR-145 in therapeutically resistant neuroblastoma cells remain elusive. Herein, we sought to evaluate the effects of miR-145 overexpression in chemo‑ and radiation-resistant neuroblastoma cells. We hypothesized that miR-145 affects the aggressiveness of resistant cells by enhancing autophagy. We established Cisplatin-resistant (CDDP-R), Vincristine-resistant (Vin-R), and radiation-resistant (Rad-R) neuroblastoma cells and found that miR-145 expression was significantly decreased in the resistant cells compared to the parental cells. Exogenously expression of miR-145 inhibited oncogenic properties such as proliferation, clonogenicity, anchorage-independent growth, cell migration, and tubule formation in the resistant cells. In addition, we also found that an autophagy protein marker, LC3, was only minimally expressed in the resistant cells. In particular, when miR-145 was overexpressed in the resistant cells, LC3 I and II were expressed and an increased punctate fluorescence of LC3 protein was found indicating the induction of autophagy. Taken together, our data suggests that miR-145 inhibits tumorigenesis and aggressiveness via modulation of autophagy in neuroblastoma.
    Language English
    Publishing date 2020-02-01
    Publishing country United States
    Document type Journal Article
    ISSN 2331-4737
    ISSN 2331-4737
    DOI 10.18632/oncoscience.496
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Identification of α-N-catenin as a novel tumor suppressor in neuroblastoma.

    Qiao, Jingbo / Rellinger, Eric J / Kim, Kwang Woon / Powers, Camille M / Lee, Sora / Correa, Hernan / Chung, Dai H

    Oncotarget

    2019  Volume 10, Issue 49, Page(s) 5028–5040

    Abstract: The lost expression of α-catenin has been found in cancers, and reinstalling α-catenin inhibits tumor growth. Here we hypothesized that the α-N-catenin, a homologous member of α-catenin and neural-specific expressed, functions as a novel tumor suppressor ...

    Abstract The lost expression of α-catenin has been found in cancers, and reinstalling α-catenin inhibits tumor growth. Here we hypothesized that the α-N-catenin, a homologous member of α-catenin and neural-specific expressed, functions as a novel tumor suppressor in neural crest-derived tumor, neuroblastoma. We correlated CTNNA2 (encodes α-N-catenin) expression to neuroblastoma disease relapse-free survival probability using publicly accessible human neuroblastoma datasets in R2 platform. The result showed that it negatively correlated to relapse-free survival probability significantly in patients with neuroblastoma with non-MYCN amplified tumor. Conversely, overexpressing CTNNA2 suppressed the neuroblastoma cell proliferation as measuring by the clonogenesis, inhibited anchorage-independent growth with soft agar colony formation assay. Forced expression of CTNNA2 decreased cell migration and invasion. Further, overexpression of CTNNA2 reduced the secretion of angiogenic factor IL-8 and HUVEC tubule formation. Our results show, for the first time, that α-N-catenin is a tumor suppressor in neuroblastoma cells. These findings were further corroborated with
    Language English
    Publishing date 2019-08-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.27096
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Dual-Targeting AKT2 and ERK in cancer stem-like cells in neuroblastoma.

    Kim, Kwang Woon / Kim, Julia Y / Qiao, Jingbo / Clark, Rachael A / Powers, Camille M / Correa, Hernan / Chung, Dai H

    Oncotarget

    2019  Volume 10, Issue 54, Page(s) 5645–5659

    Abstract: Neuroblastoma remains one of the most difficult pediatric solid tumors to treat. In particular, the refractory and relapsing neuroblastomas are highly heterogeneous with diverse molecular profiles. We previously demonstrated that AKT2 plays critical ... ...

    Abstract Neuroblastoma remains one of the most difficult pediatric solid tumors to treat. In particular, the refractory and relapsing neuroblastomas are highly heterogeneous with diverse molecular profiles. We previously demonstrated that AKT2 plays critical roles in the regulation of neuroblastoma tumorigenesis. Here we hypothesize that targeting AKT2 could block the signal transduction pathways enhanced in chemo- and/or radiation-resistant neuroblastoma cancer stem-like cells. We found cell proliferation and survival signaling pathways AKT2/mTOR and MAPK were enhanced in cisplatin (CDDP)- and radiation-resistant neuroblastoma cells. Blocking these two pathways with specific inhibitors, CCT128930 (AKT2 inhibitor) and PD98059 (MEK inhibitor) decreased cell proliferation, angiogenesis, and cell migration in these resistant cells. We further demonstrated that the resistant cells had a higher sphere-forming capacity with increased expression of stem cell markers CD133, SOX2, ALDH, Nestin, Oct4, and Nanog. Importantly, the tumorsphere formation, which is a surrogate assay for self-renewal, was sensitive to the inhibitors of AKT2 and MAPK. Taken together, our findings suggest that CDDP- and radiation-resistant cancer stem-like neuroblastoma cells might serve as a useful tool to improve the understanding of molecular mechanisms of therapeutic resistance. This may aid in the development of more effective novel treatment strategies and better clinical outcomes in patients with neuroblastoma.
    Language English
    Publishing date 2019-09-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.27210
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: PD-1H/VISTA mediates immune evasion in acute myeloid leukemia.

    Kim, Tae Kon / Han, Xue / Hu, Qianni / Vandsemb, Esten N / Fielder, Carly M / Hong, Junshik / Kim, Kwang Woon / Mason, Emily F / Plowman, R Skipper / Wang, Jun / Wang, Qi / Zhang, Jian-Ping / Badri, Ti / Sanmamed, Miguel F / Zheng, Linghua / Zhang, Tianxiang / Alawa, Jude / Lee, Sang Won / Zeidan, Amer M /
    Halene, Stephanie / Pillai, Manoj M / Chandhok, Namrata S / Lu, Jun / Xu, Mina L / Gore, Steven D / Chen, Lieping

    The Journal of clinical investigation

    2024  Volume 134, Issue 3

    Abstract: Acute myeloid leukemia (AML) presents a pressing medical need in that it is largely resistant to standard chemotherapy as well as modern therapeutics, such as targeted therapy and immunotherapy, including anti-programmed cell death protein (anti-PD) ... ...

    Abstract Acute myeloid leukemia (AML) presents a pressing medical need in that it is largely resistant to standard chemotherapy as well as modern therapeutics, such as targeted therapy and immunotherapy, including anti-programmed cell death protein (anti-PD) therapy. We demonstrate that programmed death-1 homolog (PD-1H), an immune coinhibitory molecule, is highly expressed in blasts from the bone marrow of AML patients, while normal myeloid cell subsets and T cells express PD-1H. In studies employing syngeneic and humanized AML mouse models, overexpression of PD-1H promoted the growth of AML cells, mainly by evading T cell-mediated immune responses. Importantly, ablation of AML cell-surface PD-1H by antibody blockade or genetic knockout significantly inhibited AML progression by promoting T cell activity. In addition, the genetic deletion of PD-1H from host normal myeloid cells inhibited AML progression, and the combination of PD-1H blockade with anti-PD therapy conferred a synergistic antileukemia effect. Our findings provide the basis for PD-1H as a potential therapeutic target for treating human AML.
    MeSH term(s) Animals ; Humans ; Mice ; Bone Marrow ; Immune Evasion ; Immunity, Cellular ; Immunotherapy ; Leukemia, Myeloid, Acute/drug therapy
    Chemical Substances VSIR protein, human ; Vsir protein, mouse
    Language English
    Publishing date 2024-02-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI164325
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: NVP-BEZ-235 enhances radiosensitization via blockade of the PI3K/mTOR pathway in cisplatin-resistant non-small cell lung carcinoma.

    Kim, Kwang Woon / Myers, Carey J / Jung, Dae Kwang / Lu, Bo

    Genes & cancer

    2014  Volume 5, Issue 7-8, Page(s) 293–302

    Abstract: Introduction: Most drug resistant cancer cells also develop resistance to radiation therapy. In this study, we hypothesized that the dual inhibitor of phosphatidylinositol-3 kinase/mammalian target of rapamycin, NVP-BEZ-235, could potentially enhance ... ...

    Abstract Introduction: Most drug resistant cancer cells also develop resistance to radiation therapy. In this study, we hypothesized that the dual inhibitor of phosphatidylinositol-3 kinase/mammalian target of rapamycin, NVP-BEZ-235, could potentially enhance radiosensitization in cisplatin-resistance (CDDP-R) non-small cell lung cancer (NSCLC) cells by disabling autophagy as a mechanism of self-preservation.
    Methods: We used both in vitro and in vivo approaches, including clonogenic assays, Western blotting, molecular analyses of autophagy and apoptosis, a xenograft model of tumor growth, and immunohistochemical analysis.
    Results: Basal p-Akt, p-mTOR and p-S6R proteins were enhanced in CDDP-R NSCLC cells. CDDP-R-resistant NSCLC cells are less radiation sensitive in comparison to parental cells (DER=0.82, p=0.02); BEZ-235 enhanced the radiosensitivity (DER=1.2, p=0.01). In addition, combining BEZ-235/RT showed a dramatic tumor growth delay in a mouse xenograft model. Immunohistochemistry showed that combination therapy yielded 50% decrease in caspase-3 activity. Moreover, cell proliferation was reduced by 87.8% and vascular density by 86.1%. These results were associated with a downregulation of PI3K/mTOR signaling pathway and an increase in autophagy.
    Conclusions: These findings may be utilized as a novel strategy to enhance the efficacy of radiation therapy in drug-selected non-small cell lung cancer exhibiting radioresistance.
    Language English
    Publishing date 2014-08-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2538519-7
    ISSN 1947-6027 ; 1947-6019
    ISSN (online) 1947-6027
    ISSN 1947-6019
    DOI 10.18632/genesandcancer.27
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Autophagy mediates paracrine regulation of vascular endothelial cells.

    Kim, Kwang Woon / Paul, Pritha / Qiao, Jingbo / Chung, Dai H

    Laboratory investigation; a journal of technical methods and pathology

    2013  Volume 93, Issue 6, Page(s) 639–645

    Abstract: Gastrin-releasing peptide (GRP) is a proangiogenic ligand secreted by tumors and acts directly upon binding to GRP receptor in endothelial cells. Angiogenesis plays a critical role in the pathology of various diseases, including cancer, as the formation ... ...

    Abstract Gastrin-releasing peptide (GRP) is a proangiogenic ligand secreted by tumors and acts directly upon binding to GRP receptor in endothelial cells. Angiogenesis plays a critical role in the pathology of various diseases, including cancer, as the formation of new blood vessels potentiates the rate of tumor growth and dissemination. GRP increases the migration of endothelial cells, but much is unknown about its role on endothelial cell proliferation and survival, as well as the signaling pathways involved. In the present study, we showed that GRP increases endothelial cell proliferation and tubule formation. There was a time-dependent increase in the levels of phosphorylated AKT, mammalian target of rapamycin (mTOR), and S6R in human umbilical vein endothelial cells treated with GRP. Interestingly, GRP treatment decreased the expression of proautophagic factors, ATG5, BECN1, and LC3 proteins. GRP also attenuated rapamycin-induced formation of autophagosomes. Moreover, overexpression of ATG5 or BECN1 significantly decreased tubule formation induced by exogenous GRP, whereas siRNA against ATG5 or BECN1 resulted in increased tubule formation with GRP treatment. Our results show that GRP inhibits the process of autophagy in vascular endothelial cells, thereby increasing endothelial cell proliferation and tubule formation. Here, we describe a novel role of GRP in the regulation of autophagy of endothelial cells, thereby providing a potential new therapeutic strategy in targeting angiogenesis during cancer progression.
    MeSH term(s) Apoptosis Regulatory Proteins/metabolism ; Autophagy ; Autophagy-Related Protein 5 ; Beclin-1 ; Cell Proliferation ; Coculture Techniques ; Endothelial Cells/physiology ; Endothelium, Vascular/growth & development ; Gastrin-Releasing Peptide/physiology ; Gene Expression Regulation ; Human Umbilical Vein Endothelial Cells ; Humans ; Membrane Proteins/metabolism ; Microtubule-Associated Proteins/metabolism ; Neovascularization, Pathologic ; Paracrine Communication ; Phosphatidylinositol 3-Kinases/metabolism ; Proto-Oncogene Proteins c-akt/metabolism ; Signal Transduction ; TOR Serine-Threonine Kinases/metabolism
    Chemical Substances ATG5 protein, human ; Apoptosis Regulatory Proteins ; Autophagy-Related Protein 5 ; BECN1 protein, human ; Beclin-1 ; Membrane Proteins ; Microtubule-Associated Proteins ; Gastrin-Releasing Peptide (80043-53-4) ; MTOR protein, human (EC 2.7.1.1) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; TOR Serine-Threonine Kinases (EC 2.7.11.1)
    Language English
    Publishing date 2013-04-22
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 80178-1
    ISSN 1530-0307 ; 0023-6837
    ISSN (online) 1530-0307
    ISSN 0023-6837
    DOI 10.1038/labinvest.2013.57
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: LAIR-1 agonism as a therapy for acute myeloid leukemia.

    Lovewell, Rustin R / Hong, Junshik / Kundu, Subhadip / Fielder, Carly M / Hu, Qianni / Kim, Kwang Woon / Ramsey, Haley E / Gorska, Agnieszka E / Fuller, Londa S / Tian, Linjie / Kothari, Priyanka / Paucarmayta, Ana / Mason, Emily F / Meza, Ingrid / Manzanarez, Yanira / Bosiacki, Jason / Maloveste, Karla / Mitchell, Ngan / Barbu, Emilia A /
    Morawski, Aaron / Maloveste, Sebastien / Cusumano, Zac / Patel, Shashank J / Savona, Michael R / Langermann, Solomon / Myint, Han / Flies, Dallas B / Kim, Tae Kon

    The Journal of clinical investigation

    2023  Volume 133, Issue 22

    Abstract: Effective eradication of leukemic stem cells (LSCs) remains the greatest challenge in treating acute myeloid leukemia (AML). The immune receptor LAIR-1 has been shown to regulate LSC survival; however, the therapeutic potential of this pathway remains ... ...

    Abstract Effective eradication of leukemic stem cells (LSCs) remains the greatest challenge in treating acute myeloid leukemia (AML). The immune receptor LAIR-1 has been shown to regulate LSC survival; however, the therapeutic potential of this pathway remains unexplored. We developed a therapeutic LAIR-1 agonist antibody, NC525, that induced cell death of LSCs, but not healthy hematopoietic stem cells in vitro, and killed LSCs and AML blasts in both cell- and patient-derived xenograft models. We showed that LAIR-1 agonism drives a unique apoptotic signaling program in leukemic cells that was enhanced in the presence of collagen. NC525 also significantly improved the activity of azacitidine and venetoclax to establish LAIR-1 targeting as a therapeutic strategy for AML that may synergize with standard-of-care therapies.
    MeSH term(s) Animals ; Humans ; Leukemia, Myeloid, Acute/drug therapy ; Leukemia, Myeloid, Acute/metabolism ; Hematopoietic Stem Cells/metabolism ; Signal Transduction ; Disease Models, Animal ; Neoplastic Stem Cells/metabolism
    Language English
    Publishing date 2023-11-15
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI169519
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  9. Article ; Online: The zinc ionophore PCI-5002 radiosensitizes non-small cell lung cancer cells by enhancing autophagic cell death.

    Kim, Kwang Woon / Speirs, Christina K / Jung, Dae Kwang / Lu, Bo

    Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer

    2011  Volume 6, Issue 9, Page(s) 1542–1552

    Abstract: Introduction: A major focus of cancer research is to identify compounds that sensitize resistant cancer cells to radiation treatment. Lung cancer cells, in particular, have high rates of radioresistance that lead to treatment failure. We have previously ...

    Abstract Introduction: A major focus of cancer research is to identify compounds that sensitize resistant cancer cells to radiation treatment. Lung cancer cells, in particular, have high rates of radioresistance that lead to treatment failure. We have previously shown that the autophagy induced in the context of decreased apoptosis confers radiosensitivity to prostate and lung cancer cells. Zinc supplementation has antiapoptotic effects in cell culture. In addition, the accumulation of zinc in response to oxidative stress has been associated with increased autophagy in astrocyte and breast cancer cells.
    Methods: In this study, we hypothesized that the zinc ionophore PCI-5002 radiosensitizes lung cancer cells by inducing autophagic cell death. To test this hypothesis, we used a combination of in vitro and in vivo approaches, including clonogenic assays to test for radiosensitivity, biochemical analyses of apoptosis and autophagy, and a xenograft mouse model of tumor growth.
    Results: We found that PCI-5002 reduced clonogenic survival in treated cells compared with untreated cells (0.03% versus 0.1% surviving fraction, p < 0.001). The increased radiosensitive fraction of PCI-5002-treated cells was accompanied by increased autophagy. PCI-5002 treatment also reduced caspase-3 cleavage. In an irradiated xenograft mouse model, the tumor growth of irradiated, PCI-5002-treated mice was slower than untreated, irradiated mice (25 days versus 22 days to reach a 1.0 cm tumor size).
    Conclusions: PCI-5002 treatment sensitizes lung cancer cells to radiation, both in vitro and in vivo. This data suggest that PCI-5002 could potentially treat radioresistant/locally advanced lung cancer by amplifying the effects of radiotherapy.
    MeSH term(s) Animals ; Apoptosis/drug effects ; Apoptosis/radiation effects ; Autophagy/drug effects ; Autophagy/radiation effects ; Carcinoma, Non-Small-Cell Lung/drug therapy ; Carcinoma, Non-Small-Cell Lung/pathology ; Carcinoma, Non-Small-Cell Lung/radiotherapy ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Cell Proliferation/radiation effects ; Cells, Cultured ; Cesium Radioisotopes ; Coordination Complexes/pharmacology ; Cytochromes c/metabolism ; Embryo, Mammalian/cytology ; Embryo, Mammalian/drug effects ; Embryo, Mammalian/radiation effects ; Female ; Fibroblasts/drug effects ; Fibroblasts/metabolism ; Fibroblasts/radiation effects ; Gamma Rays ; Humans ; Immunoblotting ; Ionophores/pharmacology ; Lung Neoplasms/drug therapy ; Lung Neoplasms/pathology ; Lung Neoplasms/radiotherapy ; Mice ; Mice, Knockout ; Mice, Nude ; Radiation-Sensitizing Agents/pharmacology ; Xenograft Model Antitumor Assays ; Zinc/metabolism ; bcl-2 Homologous Antagonist-Killer Protein/physiology ; bcl-2-Associated X Protein/physiology
    Chemical Substances Bak1 protein, mouse ; Bax protein, mouse ; Cesium Radioisotopes ; Coordination Complexes ; Ionophores ; PCI 5002 ; Radiation-Sensitizing Agents ; bcl-2 Homologous Antagonist-Killer Protein ; bcl-2-Associated X Protein ; Cytochromes c (9007-43-6) ; Zinc (J41CSQ7QDS)
    Language English
    Publishing date 2011-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2432037-7
    ISSN 1556-1380 ; 1556-0864
    ISSN (online) 1556-1380
    ISSN 1556-0864
    DOI 10.1097/JTO.0b013e3182208fac
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: M867, a novel selective inhibitor of caspase-3 enhances cell death and extends tumor growth delay in irradiated lung cancer models.

    Kim, Kwang Woon / Moretti, Luigi / Lu, Bo

    PloS one

    2008  Volume 3, Issue 5, Page(s) e2275

    Abstract: Background: Lung cancer remains the leading cause of cancer death worldwide. Radioresistance of lung cancer cells results in unacceptable rate of loco-regional failure. Although radiation is known to induce apoptosis, our recent study showed that ... ...

    Abstract Background: Lung cancer remains the leading cause of cancer death worldwide. Radioresistance of lung cancer cells results in unacceptable rate of loco-regional failure. Although radiation is known to induce apoptosis, our recent study showed that knockdown of pro-apoptotic proteins Bak and Bax resulted in an increase in autophagic cell death and lung cancer radiosensitivity in vitro. To further explore the potential of apoptosis inhibition as a way to sensitize lung cancer for therapy, we tested M867, a novel chemical and reversible caspase-3 inhibitor, in combination with ionizing radiation in vivo and in vitro.
    Methods and findings: M867 reduced clonogenic survival in H460 lung cancer cells (DER = 1.27, p = 0.007) compared to the vehicle-treated treated cells. We found that administration of M867 with ionizing radiation in an in vivo mouse hind limb lung cancer model was well tolerated, and produced a significant tumor growth delay compared to radiation alone. A dramatic decrease in tumor vasculature was observed with M867 and radiation using von Willebrand factor staining. In addition, Ki67 index showed >5-fold reduction of tumor proliferation in the combination therapy group, despite the reduced levels of apoptosis observed with terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling staining. Radiosensitizing effect of M867 through inhibiting caspases was validated using caspase-3/-7 double-knockout (DKO) mouse embryonic fibroblasts (MEF) cell model. Consistent with our previous study, autophagy contributed to the mechanism of increased cell death, following inhibition of apoptosis. In addition, matrigel assay showed a decrease in in vitro endothelial tubule formation during the M867/radiation combination treatment.
    Conclusions: M867 enhances the cytotoxic effects of radiation on lung cancer and its vasculature both in vitro and in vivo. M867 has the potential to prolong tumor growth delay by inhibiting tumor proliferation. Clinical trials are needed to determine the potential of this combination therapy in patients with locally advanced lung cancer.
    MeSH term(s) Animals ; Apoptosis/drug effects ; Autophagy ; Base Sequence ; Caspase Inhibitors ; Cell Line, Tumor ; Cysteine Proteinase Inhibitors/pharmacology ; Humans ; Lung Neoplasms/blood supply ; Lung Neoplasms/pathology ; Lung Neoplasms/radiotherapy ; Mice ; Mice, Knockout ; Oxadiazoles/pharmacology ; Pyrazines/pharmacology ; RNA, Small Interfering ; Radiation Tolerance ; Transplantation, Heterologous
    Chemical Substances Caspase Inhibitors ; Cysteine Proteinase Inhibitors ; M867 compound ; Oxadiazoles ; Pyrazines ; RNA, Small Interfering
    Language English
    Publishing date 2008-05-28
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0002275
    Database MEDical Literature Analysis and Retrieval System OnLINE

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