Non-apoptotic programmed cell death with paraptotic-like features in bleomycin-treated plant cells is suppressed by inhibition of ATM/ATR pathways or NtE2F overexpression
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
22268149
DOI
10.1093/jxb/err439
PII: err439
Knihovny.cz E-resources
- MeSH
- Bleomycin pharmacology MeSH
- Cell Death drug effects MeSH
- Down-Regulation drug effects MeSH
- Gene Expression drug effects MeSH
- DNA Fragmentation drug effects MeSH
- Cell Cycle Checkpoints drug effects MeSH
- Protein Serine-Threonine Kinases genetics metabolism MeSH
- Plant Proteins genetics metabolism MeSH
- Nicotiana cytology drug effects genetics metabolism MeSH
- E2F Transcription Factors genetics metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Bleomycin MeSH
- Protein Serine-Threonine Kinases MeSH
- Plant Proteins MeSH
- E2F Transcription Factors MeSH
In plants, different forms of programmed cell death (PCD) have been identified, but they only partially correspond to those described for animals, which is most probably due to structural differences between animal and plant cells. Here, the results show that in tobacco BY-2 cells, bleomycin (BLM), an inducer of double-strand breaks (DSBs), triggers a novel type of non-apoptotic PCD with paraptotic-like features. Analysis of numerous PCD markers revealed an extensive vacuolization, vacuolar rupture, and chromatin condensation, but no apoptotic DNA fragmentation, fragmentation of the nuclei, or sensitivity to caspase inhibitors. BLM-induced PCD was cell cycle regulated, occurring predominantly upon G(2)/M cell cycle checkpoint activation. In addition, this paraptotic-like PCD was at least partially inhibited by caffeine, a known inhibitor of DNA damage sensor kinases ATM and ATR. Interestingly, overexpression of one NtE2F transcriptional factor, whose homologues play a dual role in animal apoptosis and DNA repair, reduced PCD induction and modulated G(2)/M checkpoint activation in BY-2 cells. These observations provide a solid ground for further investigations into the paraptotic-like PCD in plants, which might represent an ancestral non-apoptotic form of PCD conserved among animals, protists, and plants.
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