The cytotoxicity of the ajoene analogue BisPMB in WHCO1 oesophageal cancer cells is mediated by CHOP/GADD153

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dc.contributor.authorSiyo, Vuyolwethuen_ZA
dc.contributor.authorSchafer, Georgiaen_ZA
dc.contributor.authorHunter, Rogeren_ZA
dc.contributor.authorGrafov, Andriyen_ZA
dc.contributor.authorGrafova, Irynaen_ZA
dc.contributor.authorNieger, Martinen_ZA
dc.contributor.authorKatz, Arieh A.en_ZA
dc.contributor.authorParker, M. Iqbalen_ZA
dc.contributor.authorKaschula, Catherine H.en_ZA
dc.date.accessioned2018-01-23T07:33:07Z
dc.date.available2018-01-23T07:33:07Z
dc.date.issued2017-05-28
dc.descriptionCITATION: Siyo, V., et al. 2017. The cytotoxicity of the ajoene analogue BisPMB in WHCO1 oesophageal cancer cells is mediated by CHOP/GADD153. Molecules, 22(6):892, doi:10.3390/molecules22060892.
dc.descriptionThe original publication is available at http://www.mdpi.com
dc.description.abstractENGLISH ABSTRACT: Garlic is a food and medicinal plant that has been used in folk medicine since ancient times for its beneficial health effects, which include protection against cancer. Crushed garlic cloves contain an array of small sulfur-rich compounds such as ajoene. Ajoene is able to interfere with biological processes and is cytotoxic to cancer cells in the low micromolar range. BisPMB is a synthetic ajoene analogue that has been shown in our laboratory to have superior cytotoxicity to ajoene. In the current study we have performed a DNA microarray analysis of bisPMB-treated WHCO1 oesophageal cancer cells to identify pathways and processes that are affected by bisPMB. The most significantly enriched biological pathways as assessed by gene ontology, KEGG and ingenuity pathway analysis were those involving protein processing in the endoplasmic reticulum (ER) and the unfolded protein response. In support of these pathways, bisPMB was found to inhibit global protein synthesis and lead to increased levels of ubiquitinated proteins. BisPMB also induced alternate splicing of the transcription factor XBP-1; increased the expression of the ER stress sensor GRP78 and induced expression of the ER stress marker CHOP/GADD153. CHOP expression was found to be central to the cytotoxicity of bisPMB as its silencing with siRNA rendered the cells resistant to bisPMB. The MAPK proteins, JNK and ERK1/2 were activated following bisPMB treatment. However JNK activation was not critical in the cytotoxicity of bisPMB, and ERK1/2 activation was found to play a pro-survival role. Overall the ajoene analogue bisPMB appears to induce cytotoxicity in WHCO1 cells by activating the unfolded protein response through CHOP/GADD153.en_ZA
dc.description.urihttp://www.mdpi.com/1420-3049/22/6/892
dc.description.versionPublisher's version
dc.format.extent19 pages : illustrationsen_ZA
dc.identifier.citationSiyo, V., et al. 2017. The cytotoxicity of the ajoene analogue BisPMB in WHCO1 oesophageal cancer cells is mediated by CHOP/GADD153. Molecules, 22(6):892, doi:10.3390/molecules22060892
dc.identifier.issn1420-3049 (online)
dc.identifier.otherdoi:10.3390/molecules22060892
dc.identifier.urihttp://hdl.handle.net/10019.1/103075
dc.language.isoen_ZAen_ZA
dc.publisherMDPI
dc.rights.holderAuthors retain copyright
dc.subjectCancer -- Preventionen_ZA
dc.subjectCytotoxic antibioticsen_ZA
dc.subjectOesophagus -- Cancer cellsen_ZA
dc.subjectUnfolding of proteinsen_ZA
dc.titleThe cytotoxicity of the ajoene analogue BisPMB in WHCO1 oesophageal cancer cells is mediated by CHOP/GADD153en_ZA
dc.typeArticleen_ZA
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