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  • 1
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    Clinical efficacy of a RAF inhibitor needs broad target blockade in BRAF-mutant melanoma (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-09-09
    Description: B-RAF is the most frequently mutated protein kinase in human cancers. The finding that oncogenic mutations in BRAF are common in melanoma, followed by the demonstration that these tumours are dependent on the RAF/MEK/ERK pathway, offered hope that inhibition of B-RAF kinase activity could benefit melanoma patients. Herein, we describe the structure-guided discovery of PLX4032 (RG7204), a potent inhibitor of oncogenic B-RAF kinase activity. Preclinical experiments demonstrated that PLX4032 selectively blocked the RAF/MEK/ERK pathway in BRAF mutant cells and caused regression of BRAF mutant xenografts. Toxicology studies confirmed a wide safety margin consistent with the high degree of selectivity, enabling Phase 1 clinical trials using a crystalline formulation of PLX4032 (ref. 5). In a subset of melanoma patients, pathway inhibition was monitored in paired biopsy specimens collected before treatment initiation and following two weeks of treatment. This analysis revealed substantial inhibition of ERK phosphorylation, yet clinical evaluation did not show tumour regressions. At higher drug exposures afforded by a new amorphous drug formulation, greater than 80% inhibition of ERK phosphorylation in the tumours of patients correlated with clinical response. Indeed, the Phase 1 clinical data revealed a remarkably high 81% response rate in metastatic melanoma patients treated at an oral dose of 960 mg twice daily. These data demonstrate that BRAF-mutant melanomas are highly dependent on B-RAF kinase activity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948082/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948082/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bollag, Gideon -- Hirth, Peter -- Tsai, James -- Zhang, Jiazhong -- Ibrahim, Prabha N -- Cho, Hanna -- Spevak, Wayne -- Zhang, Chao -- Zhang, Ying -- Habets, Gaston -- Burton, Elizabeth A -- Wong, Bernice -- Tsang, Garson -- West, Brian L -- Powell, Ben -- Shellooe, Rafe -- Marimuthu, Adhirai -- Nguyen, Hoa -- Zhang, Kam Y J -- Artis, Dean R -- Schlessinger, Joseph -- Su, Fei -- Higgins, Brian -- Iyer, Raman -- D'Andrea, Kurt -- Koehler, Astrid -- Stumm, Michael -- Lin, Paul S -- Lee, Richard J -- Grippo, Joseph -- Puzanov, Igor -- Kim, Kevin B -- Ribas, Antoni -- McArthur, Grant A -- Sosman, Jeffrey A -- Chapman, Paul B -- Flaherty, Keith T -- Xu, Xiaowei -- Nathanson, Katherine L -- Nolop, Keith -- K24 CA097588/CA/NCI NIH HHS/ -- P50 CA093372/CA/NCI NIH HHS/ -- P50 CA093372-01/CA/NCI NIH HHS/ -- R01 CA118871/CA/NCI NIH HHS/ -- R01 CA118871-01A1/CA/NCI NIH HHS/ -- England -- Nature. 2010 Sep 30;467(7315):596-9. doi: 10.1038/nature09454.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plexxikon Inc., 91 Bolivar Drive, Berkeley, California 94710, USA. gbollag@plexxikon.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20823850" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Dogs ; Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors/metabolism ; Humans ; Indoles/administration & dosage/adverse effects/chemistry/*therapeutic use ; MAP Kinase Signaling System/drug effects ; Macaca fascicularis ; Melanoma/*drug therapy/*enzymology/genetics/pathology ; Models, Molecular ; Mutant Proteins/antagonists & inhibitors/chemistry/genetics/metabolism ; Mutation/*genetics ; Neoplasm Metastasis ; Phosphorylation/drug effects ; Positron-Emission Tomography ; Proto-Oncogene Proteins B-raf/*antagonists & ; inhibitors/chemistry/genetics/metabolism ; Rats ; Substrate Specificity ; Sulfonamides/administration & dosage/adverse effects/chemistry/*therapeutic use ; Xenograft Model Antitumor Assays
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    RAF inhibitors that evade paradoxical MAPK pathway activation (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-10-16
    Description: Oncogenic activation of BRAF fuels cancer growth by constitutively promoting RAS-independent mitogen-activated protein kinase (MAPK) pathway signalling. Accordingly, RAF inhibitors have brought substantially improved personalized treatment of metastatic melanoma. However, these targeted agents have also revealed an unexpected consequence: stimulated growth of certain cancers. Structurally diverse ATP-competitive RAF inhibitors can either inhibit or paradoxically activate the MAPK pathway, depending whether activation is by BRAF mutation or by an upstream event, such as RAS mutation or receptor tyrosine kinase activation. Here we have identified next-generation RAF inhibitors (dubbed 'paradox breakers') that suppress mutant BRAF cells without activating the MAPK pathway in cells bearing upstream activation. In cells that express the same HRAS mutation prevalent in squamous tumours from patients treated with RAF inhibitors, the first-generation RAF inhibitor vemurafenib stimulated in vitro and in vivo growth and induced expression of MAPK pathway response genes; by contrast the paradox breakers PLX7904 and PLX8394 had no effect. Paradox breakers also overcame several known mechanisms of resistance to first-generation RAF inhibitors. Dissociating MAPK pathway inhibition from paradoxical activation might yield both improved safety and more durable efficacy than first-generation RAF inhibitors, a concept currently undergoing human clinical evaluation with PLX8394.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Chao -- Spevak, Wayne -- Zhang, Ying -- Burton, Elizabeth A -- Ma, Yan -- Habets, Gaston -- Zhang, Jiazhong -- Lin, Jack -- Ewing, Todd -- Matusow, Bernice -- Tsang, Garson -- Marimuthu, Adhirai -- Cho, Hanna -- Wu, Guoxian -- Wang, Weiru -- Fong, Daniel -- Nguyen, Hoa -- Shi, Songyuan -- Womack, Patrick -- Nespi, Marika -- Shellooe, Rafe -- Carias, Heidi -- Powell, Ben -- Light, Emily -- Sanftner, Laura -- Walters, Jason -- Tsai, James -- West, Brian L -- Visor, Gary -- Rezaei, Hamid -- Lin, Paul S -- Nolop, Keith -- Ibrahim, Prabha N -- Hirth, Peter -- Bollag, Gideon -- England -- Nature. 2015 Oct 22;526(7574):583-6. doi: 10.1038/nature14982. Epub 2015 Oct 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plexxikon Inc., 91 Bolivar Drive, Berkeley, California 94710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26466569" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line, Tumor ; Enzyme Activation/drug effects ; Female ; Genes, ras/genetics ; Heterocyclic Compounds, 2-Ring/adverse effects/pharmacology ; Humans ; Indoles/adverse effects/pharmacology ; MAP Kinase Signaling System/*drug effects/genetics ; Mice ; Mitogen-Activated Protein Kinases/*metabolism ; Models, Biological ; Mutation/genetics ; Protein Kinase Inhibitors/adverse effects/*pharmacology ; Proto-Oncogene Proteins B-raf/*antagonists & inhibitors/genetics ; Sulfonamides/adverse effects/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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