PMID: 16615858Apr 18, 2006Paper

H2O2 intensifies CN(-)-induced apoptosis in pea leaves

Biochemistry. Biokhimii︠a︡
V D SamuilovA V Nesov

Abstract

H2O2 intensifies CN(-)-induced apoptosis in stoma guard cells and to lesser degree in basic epidermal cells in peels of the lower epidermis isolated from pea leaves. The maximum effect of H2O2 on guard cells was observed at 10(-4) M. By switching on non-cyclic electron transfer in chloroplasts menadione and methyl viologen intensified H2O2 generation in the light, but prevented the CN--induced apoptosis in guard cells. The light stimulation of CN- effect on guard cell apoptosis cannot be caused by disturbance of the ribulose-1,5-bisphosphate carboxylase function and associated OH* generation in chloroplasts with participation of free transition metals in the Fenton or Haber-Weiss type reactions as well as with participation of the FeS clusters of the electron acceptor side of Photosystem I. Menadione and methyl viologen did not suppress the CN(-)-induced apoptosis in epidermal cells that, unlike guard cells, contain mitochondria only, but not chloroplasts. Quinacrine and diphenylene iodonium, inhibitors of NAD(P)H oxidase of cell plasma membrane, had no effect on the respiration and photosynthetic O2 evolution by leaf slices, but prevented the CN(-)-induced guard cell death. The data suggest that NAD(P)H oxidase of guard cell p...Continue Reading

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Citations

Jun 19, 2007·Biochemistry. Biokhimii︠a︡·L A Vasil'evV D Samuilov
Nov 11, 2008·Biochemistry. Biokhimii︠a︡·V D SamuilovL A Vasil'ev
Nov 18, 2009·Biochemistry. Biokhimii︠a︡·L A Vasil'evV D Samuilov
Jul 17, 2010·Biochemistry. Biokhimii︠a︡·D B KiselevskyV D Samuilov
Nov 22, 2011·Biochemistry. Biokhimii︠a︡·L A Vasil'evV D Samuilov

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis

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