Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0006-2952(03)00262-4
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dc.titleRole of tissue transglutaminase in GTP depletion-induced apoptosis of insulin-secreting (HIT-T15) cells
dc.contributor.authorHuo, J.
dc.contributor.authorLi, G.
dc.contributor.authorMetz, S.A.
dc.date.accessioned2011-11-29T09:19:30Z
dc.date.available2011-11-29T09:19:30Z
dc.date.issued2003
dc.identifier.citationHuo, J., Li, G., Metz, S.A. (2003). Role of tissue transglutaminase in GTP depletion-induced apoptosis of insulin-secreting (HIT-T15) cells. Biochemical Pharmacology 66 (2) : 213-223. ScholarBank@NUS Repository. https://doi.org/10.1016/S0006-2952(03)00262-4
dc.identifier.issn00062952
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/29035
dc.description.abstractThe role of tissue transglutaminase (tTG), a calcium-dependent and GTP-modulated enzyme, in apoptotic death induced by GTP depletion in islet β-cells was investigated. GTP depletion and apoptosis were induced by mycophenolic acid (MPA) in insulin-secreting HIT-T15 cells. MPA treatment increased in situ tTG activity (but not protein levels) in a dose- and time-dependent manner in parallel with the induction of apoptosis. MPA-induced increases of both tTG activity and apoptosis were entirely blocked by co-provision of guanosine but not adenosine. MPA-enhanced tTG activity could be substantially reduced by co-exposure to monodansylcadaverine or putrescine (tTG inhibitors), and largely blocked by lowering free Ca2+ concentrations in the culture medium. However, MPA-induced cell death was either not changed or was only slightly reduced under these conditions. By contrast, a pan-caspase inhibitor (Z-VAD-FMK) entirely prevented apoptosis induced by MPA, but did not block the enhanced tTG activity, indicating that GTP depletion can induce apoptosis and activate tTG either independently or as part of a cascade of events involving caspases. Importantly, the morphological changes accompanying apoptosis could be markedly prevented by tTG inhibitors. These findings suggest that the effect of the marked increase in tTG activity in GTP depletion-induced apoptosis of insulin-secreting cells may be restricted to some terminal morphological changes. © 2003 Elsevier Science Inc. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/S0006-2952(03)00262-4
dc.sourceScopus
dc.subjectApoptosis
dc.subjectCaspase
dc.subjectGuanine nucleotides
dc.subjectIslet β-cells
dc.subjectMycophenolic acid
dc.subjectTissue transglutaminase
dc.typeArticle
dc.contributor.departmentNATIONAL UNIVERSITY MEDICAL INSTITUTES
dc.description.doi10.1016/S0006-2952(03)00262-4
dc.description.sourcetitleBiochemical Pharmacology
dc.description.volume66
dc.description.issue2
dc.description.page213-223
dc.description.codenBCPCA
dc.identifier.isiut000184051900004
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