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  • 1
    Online Resource
    Online Resource
    Rottlerin induces autophagy and apoptotic cell death through a PKC-delta-independent pathway in HT1080 human fibrosarcoma cells: The protective role of autophagy in apoptosis
    Informa UK Limited ; 2008
    In:  Autophagy Vol. 4, No. 5 ( 2008-07), p. 650-658
    Details
    In: Autophagy, Informa UK Limited, Vol. 4, No. 5 ( 2008-07), p. 650-658
    Type of Medium: Online Resource
    ISSN: 1554-8627 , 1554-8635
    URL: Article
    DOI: 10.4161/auto.6057
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2008
    detail.hit.zdb_id: 2262043-6
    SSG: 12
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  • 2
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    Abstract 2867: Docosahexaenoic acid induces autophagy through p53/AMPK/mTOR signaling in human cancer cells
    American Association for Cancer Research (AACR) ; 2011
    In:  Cancer Research Vol. 71, No. 8_Supplement ( 2011-04-15), p. 2867-2867
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 71, No. 8_Supplement ( 2011-04-15), p. 2867-2867
    Abstract: Although Omega 3-polyunsatuarated fatty acids (Omega 3-PUFAs) induce cytotoxicity in several cancer cell lines, the exact mechanisms are not identified yet. In this study, we showed that autophagy is involved in the Omega 3-PUFAs-induced cytotoxicity in cancer cells. Autophagy is characterized by the sequestration of cytoplasmic material within autophagosomes for bulk degradation by lysosomes. We found that docosahexaenoic acid (DHA), an Omega 3-PUFA, induced not only apoptosis but also autophagy in cancer cells. Autophagy was detected after DHA exposure as indicated by induction of LC3 expression, and formation of autophagic vacuolization. We observed that the DHA-induced autophagy was accompanied by loss of p53. Inhibition of p53 by Pifithrin-α or microRNA-p53 significantly increased the DHA-induced autophagy, suggesting that the DHA-induced autophagy is mediated by downregulation of p53. Further experiments showed that the mechanism of the DHA-induced autophagy associated with p53 attenuation, involved an increase in the active form of AMPK which attenuated the mTOR activity as revealed by p27 sequestration. In addition, compelling evidence for the interplay between autophagy and apoptotic cell death induced by DHA is supported by the findings that autophagy inhibition partially decreased the DHA-induced apoptotic cell death and further autophagy induction by p53 inhibitor enhanced apoptosis in response to treatment with DHA in cancer cells. Our results demonstrate that autophagy may be related to the DHA-induced cytotoxicity in cancer cells. [This work was supported by basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (E00026 and R13-2007-020-01000-0]. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 2867. doi:10.1158/1538-7445.AM2011-2867
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM2011-2867
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2011
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    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 3
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    Abstract 4439: Anti-cancer actions of omega-3 polyunsaturated fatty acids in human cervical cancer
    American Association for Cancer Research (AACR) ; 2010
    In:  Cancer Research Vol. 70, No. 8_Supplement ( 2010-04-15), p. 4439-4439
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 70, No. 8_Supplement ( 2010-04-15), p. 4439-4439
    Abstract: Over 90% of human cervical carcinoma is associated with high risk human papillomavirus (HPV), and a number of biological effects that could contribute to cancer suppression by ω3-polyunsaturated fatty acids (ω3-PUFAs) have been reported. However, the anti-cancer effect of ω3-PUFAs on cervical cancer has been not known yet. In this study, we report inhibitory mechanisms of ω3-PUFAs on cell growth and invasion in cervical cancer. DHA inhibited the cell growth in a dose- and time-dependent manner. In flow cytometry analysis, cell cycle of DHA-treated HeLa cells was arrested in G2/M phase and SubG1 cells also increased. Moreover, apoptotic cell death was confirmed by TUNEL assay, the induction of PARP cleavage and down-regulation of Bcl-2. The invasiveness of cells was significantly inhibited by DHA treatment in vitro transwell assay as well. The MMP-9 and MMP-2 promoter activities were decreased after DHA treatment. Cox-2 and VEGF promoter activities were also inhibited by DHA. Furthermore, DHA decreased the levels of reporter activity of NF-κB, which is transcription factor that regulates MMPs, Cox-2 and VEGF expression. In in vivo experiments, when human papillomavirus type 16 (HPV16)-transformed mouse TC-1 cells were injected into the tail vein of Fat1 mice (Fat1 transgenic mice express a Caenorhabditis elegans ω3-desaturase converting ω6- to ω3-PUFAs endogenously.) and WT (wild type) mice, lung metastasis of TC-1 cells was dramatically inhibited in Fat1 transgenic mice compared to WT mice. Taken together, these findings provide evidence that ω3-PUFAs may inhibit metastasis as well as cell growth and invasion through suppression of MMPs/COX-2/VEGF expression by inhibition of NF-κB expression in cervical cancer cells, indicating that the utilization of ω3-PUFAs may represent a potential effective therapy for the chemoprevention and treatment of human cervical cancer.[This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government(MEST) (#E00026) and by the Infection Signaling Network Research Center (R13-2007-020-01000-0) at Chungnam National University] . Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 4439.
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM10-4439
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2010
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
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  • 4
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    Radiation-Induced Thymidine Phosphorylase Upregulation in Rectal Cancer Is Mediated by Tumor-Associated Macrophages by Monocyte Chemoattractant Protein–1 From Cancer Cells
    Elsevier BV ; 2009
    In:  International Journal of Radiation Oncology*Biology*Physics Vol. 73, No. 3 ( 2009-3), p. 853-860
    Details
    In: International Journal of Radiation Oncology*Biology*Physics, Elsevier BV, Vol. 73, No. 3 ( 2009-3), p. 853-860
    Type of Medium: Online Resource
    ISSN: 0360-3016
    URL: Article
    DOI: 10.1016/j.ijrobp.2008.07.068
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
    detail.hit.zdb_id: 1500486-7
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  • 5
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    PMA synergistically enhances apicularen A-induced cytotoxicity by disrupting microtubule networks in HeLa cells
    Springer Science and Business Media LLC ; 2014
    In:  BMC Cancer Vol. 14, No. 1 ( 2014-12)
    Details
    In: BMC Cancer, Springer Science and Business Media LLC, Vol. 14, No. 1 ( 2014-12)
    Abstract: Combination therapy is key to improving cancer treatment efficacy. Phorbol 12-myristate 13-acetate (PMA), a well-known PKC activator, increases the cytotoxicity of several anticancer drugs. Apicularen A induces cytotoxicity in tumor cells through disrupting microtubule networks by tubulin down-regulation. In this study, we examined whether PMA increases apicularen A-induced cytotoxicity in HeLa cells. Methods Cell viability was examined by thiazolyl blue tetrazolium (MTT) assays. To investigate apoptotic potential of apicularen A, DNA fragmentation assays were performed followed by extracting genomic DNA, and caspase-3 activity assays were performed by fluorescence assays using fluorogenic substrate. The cell cycle distribution induced by combination with PMA and apicularen A was examined by flow cytometry after staining with propidium iodide (PI). The expression levels of target proteins were measured by Western blotting analysis using specific antibodies, and α-tubulin mRNA levels were assessed by reverse transcription polymerase chain reaction (RT-PCR). To examine the effect of combination of PMA and apicularen A on the microtubule architecture, α-tubulin protein and nuclei were visualized by immunofluorescence staining using an anti-α-tubulin antibody and PI, respectively. Results We found that apicularen A induced caspase-dependent apoptosis in HeLa cells. PMA synergistically increased cytotoxicity and apoptotic sub-G 1 population induced by apicularen A. These effects were completely blocked by the PKC inhibitors Ro31-8220 and Go6983, while caspase inhibition by Z-VAD-fmk did not prevent cytotoxicity. RNA interference using siRNA against PKCα, but not PKCβ and PKCγ, inhibited cytotoxicity induced by combination PMA and apicularen A. PMA increased the apicularen A-induced disruption of microtubule networks by further decreasing α- and β-tubulin protein levels in a PKC-dependent manner. Conclusions These results suggest that the synergy between PMA and apicularen A is involved by PKCα activation and microtubule disruption, and that may inform the development of novel approaches to treat cancer.
    Type of Medium: Online Resource
    ISSN: 1471-2407
    URL: Article
    DOI: 10.1186/1471-2407-14-36
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
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  • 6
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    Abstract 1985: Omega-3 polyunsaturated fatty acids induce cell cytotoxicity through apoptosis and autophgy in brain cancer in vitro and in vivo
    American Association for Cancer Research (AACR) ; 2012
    In:  Cancer Research Vol. 72, No. 8_Supplement ( 2012-04-15), p. 1985-1985
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 72, No. 8_Supplement ( 2012-04-15), p. 1985-1985
    Abstract: One of the most common and biologically aggressive of malignant astrocytic gliomas is glioblastoma (GBM). Studies have revealed a significant role of phosphatidylinositol-3-OH kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) signaling activation during GBM development. Omega-3 polyunsaturated fatty acids (≥3-PUFAs) have been shown to inhibit several cancer cells growth such as breast cancer cells. Here, we examined the anticancer effect of α3-PUFAs in D54 malignant glioma (D54MG) cells. We show that docosahexaenoic acid (DHA), a α3-PUFA, induced apoptosis in D54MG cells, as confirmed by the formation of cleaved PARP, TUNEL assay and cytofluorometric analysis. DHA-treated D54MG cells also showed a significant increase in autophagic activity as revealed by LC3-II elevation, autophagic vesicles formation and autophagy flux assays, suggeting that both apoptosis and autophagy contribute to the DHA-induced tumor cell death. The DHA-induced cell death in D54MG cells was accompained by the activation of AMPK and decrease in the Akt phosphorylation. DHA also decreased the activity of mTOR and the level of its downstream molecule 4EBP as analyzed by the Western blot assay. DHA-induced apoptosis and autophagy were partially blocked by transient overexpression of Akt, supporting the inhibition of Akt being beneficial to the death of GBM cells. In in vivo studies, the growth of implanted murine GBM cells in Fat-1 transgenic mice, that can produce high levels of α3-PUFA, was significantly inhibited, and the apoptotic index was higher compared with wild type mice. Together, these results suggest that α3-FUFAs induce cell cytotoxicity through apoptosis and autophgy in brain cancer. [This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology(2011-0006232).] Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 1985. doi:1538-7445.AM2012-1985
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM2012-1985
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2012
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    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 7
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    Abstract 4457: Omega-3 polyunsaturated fatty acids induce apoptosis cell death and inhibit LPS-induced invasion in PC3 cells
    American Association for Cancer Research (AACR) ; 2010
    In:  Cancer Research Vol. 70, No. 8_Supplement ( 2010-04-15), p. 4457-4457
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 70, No. 8_Supplement ( 2010-04-15), p. 4457-4457
    Abstract: Dietary fat as a potential risk factor for cancer has been the focus of many epidemiologic and basic researchers, but the findings have been inconclusive. Toll-like receptor 4 (TLR4)-mediated signaling has been implicated in tumor cell invasion, survival, and metastasis in a variety of cancers. In this study, we have investigated anticancer action of ω3-PUFAs and effect of ω3-PUFAs on LPS-mediated TLR4 signaling in prostate cancer. DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid) treatment resulted in a dose-dependent reduction of cell viability with apoptosis of PC3 cells as confirmed by TUNEL assay. In contrast, AA (arachidonic acid), a ω6-PUFA, exhibited no significant effect. Moreover, invasiveness of PC3 cells was inhibited in a dose-dependent manner by treatment of DHA, while AA showed no significant effect. In zymography, MMP-2 activity was inhibited by DHA treatment and MMP-9 and MMP-2 promoter activities were also inhibited. DHA inhibited Cox-2 and VEGF promoter activities and NF-kB reporter activity was also decreased. The expression of TLR4 was confirmed by RT-PCR in PC3 cells and DHA dramatically inhibited the LPS-induced invasion of PC3 cells. In in vivo experiments, when mouse prostate cancer cells (RM1) were injected into the tail vein of Fat1 mice (Fat1 transgenic mice express a Caenorhabditis elegans ω3-desaturase converting ω6- to ω3-PUFAs endogenously.) and WT (wild type mice), lung metastasis was significantly inhibited in Fat1 transgenic mice compared to WT mice. In conclusion, the present study suggests that ω3-PUFAs may inhibit prostate cancer cell growth, and invasion through decrease of MMPs, Cox-2, VEGF and NF-kB reporter activities. Moreover LPS-mediated invasiveness was inhibited by DHA. These findings provide important preclinical evidence and molecular insight for utilization of ω-3 PUFAs for the chemoprevention and treatment of human prostate cancer. [This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Infection Signaling Network Research Center (R13-2007-020-01000-0) at Chungnam National University]. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 4457.
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM10-4457
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2010
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 8
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    Abstract 4175: Reactive oxygen species-dependent ERK and JNK activation is important to docasahexaenoic acid-induced cell cytotoxicity in human ovarian cancer cells
    American Association for Cancer Research (AACR) ; 2012
    In:  Cancer Research Vol. 72, No. 8_Supplement ( 2012-04-15), p. 4175-4175
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 72, No. 8_Supplement ( 2012-04-15), p. 4175-4175
    Abstract: Although abundant experimental evidences show that the Omega-3 polyunsaturated fatty acids (≥3-PUFAs) prevent carcinogenesis, the exact molecular mechanisms of the anti-cancer actions of α3-PUFAs in ovarian cancer remain incompletely understood. In the present study, the effectiveness of docosahexaenoic acid (DHA), a α3-PUFA, against ovarian cancer cells was investigated. We found that DHA induced cell cytotoxicity in three ovarian cancer cells including PA-1, MDAH2774 and ID8. DHA treatment inhibited the cell proliferation of PA-1 cells in a dose- and time-dependent manner. Meanwhile, DHA-treated ovarian cancer cells showed increased levels of caspase-3 activity, Annexin-V staining positive cells, TUNEL-positive cells and the portion of sub-G1 cells, suggesting that DHA-induced cell death is mainly associated with apoptosis. Western blot and immunocytochemistry assays revealed that DHA also remarkably increased the levels of phospho-ERK and phospho-JNK in both cytosol and nucleus. Moreover, knockdown ERK and JNK by small interfering RNAs partially attenuated the apoptosis induced by DHA, indicating that ERK and JNK activation is responsible for the apoptosis in DHA-treated ovarian cancer cells. In addition, we determined that the activation of ERK and JNK was associated with the reactive oxygen species (ROS) production induced by DHA. ROS scavenger, N-acetyl-L-cysteine (NAC), almost completely blocked the ERK and JNK phosphorylation as well as the apoptosis triggered by DHA. Together, these results indicate that DHA induces ROS and the ROS-dependent ERK and JNK activation is important to DHA-induced cell cytotoxicity in human ovarian cancer cells. [This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0006232 and 2011-0003060)]. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 4175. doi:1538-7445.AM2012-4175
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM2012-4175
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2012
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 9
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    Abstract 2071: Docosahexaenoic acid-induced apoptosis is directly linked to mitochondria-mediated reactive oxygen species production in human cervical cancer cells
    American Association for Cancer Research (AACR) ; 2012
    In:  Cancer Research Vol. 72, No. 8_Supplement ( 2012-04-15), p. 2071-2071
    Details
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 72, No. 8_Supplement ( 2012-04-15), p. 2071-2071
    Abstract: Reactive oxygen species (ROS) produced by docosahexaenoic acid (DHA) have an important function in cancer cell death. However, the exact mechanism of ROS production, after DHA stimulation, is not clearly understood. Here, we determined that elevated levels of ROS generated by mitochondrial respiration is directly associated with DHA-induced cervical cancer cell death. The levels of caspase 3 activity, TUNEL-positive staining cells and Sub-G1 portion were markedly increased in DHA-treated cancer cells, suggesting that apoptosis is responsible for the DHA-induced cervical cancer cell death. Furthermore, DHA was able to induce both mitochondrial complex I substrate- and complex II substrate-supported mitochondrial ROS production in isolated mitochondria from rodent liver. Meanwhile, a reduction in oxygen consumption rate and an increase in mitochondrial ROS production as measured by MitoSOX, were also observed in DHA-treated cancer cells, indicating that DHA can directly act on mitochondrial respiration and enhance ROS generation. The role of DHA-induced mitochondrial ROS production in apoptosis was further identified by the findings that DHA reduced the mitochondrial membrane potential, resulting in cardiolipin oxidation and cytochrome c release from mitochondria, and that N-acetylcysteine, an antioxidant almost completely blocked these processes as well as ROS production occurred in mitochondria and remarkably reversed the apoptotic cell death triggered by DHA. From the results presented here, we conclude that mitochondria actively participate in the DHA-induced apoptotic cell death by the generation of mitochondrial ROS. (This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (2011-0006232 and 2011-0003060)). Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 2071. doi:1538-7445.AM2012-2071
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    URL: Article
    DOI: 10.1158/1538-7445.AM2012-2071
    RVK:
    XA 36000
    RVK:
    XA 10000
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2012
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  • 10
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    Gabexate Mesilate Inhibits Colon Cancer Growth, Invasion, and Metastasis by Reducing Matrix Metalloproteinases and Angiogenesis
    American Association for Cancer Research (AACR) ; 2004
    In:  Clinical Cancer Research Vol. 10, No. 13 ( 2004-07-01), p. 4517-4526
    Details
    In: Clinical Cancer Research, American Association for Cancer Research (AACR), Vol. 10, No. 13 ( 2004-07-01), p. 4517-4526
    Abstract: Gabexate mesilate (GM), a synthetic protease inhibitor, has an antiproteinase activity on various types of plasma serine proteases. However, its role on matrix metalloproteinases (MMPs) has not been identified. In this study, we investigated the effect of GM on MMPs and on the invasion and metastasis of human colon cancer cell lines and neoangiogenesis. The activities of MMPs secreted from these cells were significantly reduced by GM but unaffected by the serine protease inhibitor aprotinin. GM directly inhibited purified progelatinase A derived from T98G human glioblastoma cells. In vitro, GM significantly reduced the invasive ability of colon cancer cells but not cellular motility, whereas aprotinin affected neither. Liver metastatic ability and tumorigenic potential in nude mice were remarkably reduced on treatment with GM. Immunohistochemical analysis of GM-treated tumors in mice showed a marked increase in apoptosis and a significant reduction in tumor angiogenesis. Human umbilical vein endothelial cell proliferation, tube formation, and neoangiogenesis in the rabbit cornea and Matrigel implanted in mice were significantly inhibited by GM. These results suggest that GM is a novel inhibitor of MMPs and that it may inhibit the invasion and metastasis of human colon cancer cells by blocking MMPs and neoangiogenesis.
    Type of Medium: Online Resource
    ISSN: 1078-0432 , 1557-3265
    URL: Article
    DOI: 10.1158/1078-0432.CCR-04-0084
    RVK:
    XA 36791
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2004
    detail.hit.zdb_id: 1225457-5
    detail.hit.zdb_id: 2036787-9
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