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- W981058498 abstract "Ribosome inactivating proteins (RIPs) are a family of plant proteins that depurinate the major rRNA, inhibiting the protein synthesis. RIPs are divided into type 1, single chain proteins with enzymatic activity, and type 2 RIPs (toxic and non-toxic), with the enzymatic chain linked to a binding chain. RIPs have been used alone or as toxic component of immunotoxins for experimental therapy of many diseases. The knowledge of cell death pathway(s) induced by RIPs could be useful for clarifying the mechanisms induced by RIPs and for designing specific immunotherapy.The topic of the current study was (i) the determination of the amino acid sequence of the type 2 RIP stenodactylin. The comparison with other RIPs showed that the A chain is related to other toxic type 2 RIPs. whereas the B chain is more related to the non-toxic type 2 RIPs. This latter result is surprising because stenodactylin is actually the most toxic type 2 RIP known; (ii) the study of the cell death mechanisms induced by stenodactylin in human neuroblastoma cells (NB100). High doses of stenodactylin can activate the effector caspases (perhaps through the DNA damage and/or intrinsic/extrinsic pathways) and also cause ROS generation. Low doses cause a caspase-dependent apoptosis, mainly via extrinsic pathway. Moreover, the activation of caspases precedes the inhibition of protein synthesis; (iii) the investigation of the cell death pathway induced by the non-toxic type 2 RIPs ebulin l and nigrin b. These RIPs demonstrated high enzymatic activity in a cell-free system, but they lack high cytotoxicity. These preliminary studies demonstrate that the cell death mechanism induced by the two non-toxic RIPs is partially caspase-dependent apoptosis, but other mechanisms seem to be involved" @default.
- W981058498 created "2016-06-24" @default.
- W981058498 creator A5075942078 @default.
- W981058498 date "2013-05-16" @default.
- W981058498 modified "2023-09-27" @default.
- W981058498 title "Pathogenesis of cell toxicity by plant toxins" @default.
- W981058498 doi "https://doi.org/10.6092/unibo/amsdottorato/5247" @default.
- W981058498 hasPublicationYear "2013" @default.
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