Roderick SP Benson

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Methylglyoxal is a spontaneous product of glucose metabolism which is known to have cytotoxic actions and to be present in raised concentrations in hyperglycaemia. It could therefore play an important role in glucose toxicity. We have investigated the cytotoxic effects of methylglyoxal on insulin-secreting cells, which are particularly sensitive to glucose(More)
A reduction in cell volume is a fundamental feature of apoptosis. We have characterized changes in cell volume, together with nuclear changes, occurring in dexamethasone-induced apoptosis in CEM-C7A lymphoblastoid cells. Cell volume was measured by electronic cell sizing and flow cytometry, and two distinct phases of volume loss were observed. The first(More)
Kinetic analysis of dexamethasone-induced apoptosis in the human lymphoblastoid cell line CCRF CEM C7A has revealed a point when cells, morphologically indistinguishable from untreated cells, have irreversibly engaged a program leading to death, measured by a loss of clonogenicity. Since all cells that fail to clone eventually died through apoptosis,(More)
Removal of interleukin-3 from murine IC.DP pre-mast cells results in irreversible commitment to apoptosis within 18 hours. To identify early events necessary for the engagement of apoptosis we examined the regulation of intracellular pH (pH(i)). IC.DP cells acidified 2 hours after removal of interleukin-3 (before discernible signs of apoptosis) and by 18(More)
BACKGROUND & AIMS H2O2 causes DNA damage, which activates poly(adenosine diphosphate ribose) polymerase (PARP), a nuclear enzyme that uses nicotinamide adenine dinucleotide (NAD) as a substrate. When DNA strand breaks are extensive, consumption of NAD by PARP can cause adenosine triphosphate depletion. The aim was to study the effect of PARP inhibition on(More)
The role of intracellular acidification in the execution phase of apoptosis is not well understood. Here we examine the effect of Bcl-2 over-expression on intracellular acidification occurring during apoptosis. We found, that in CEM cells, neither DEX nor VP16-induced apoptosis lead to a significant change in intracellular pH (pHi). Furthermore, we found(More)
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