We have attempted to find the putative global minimum structures of Morse clusters for cluster size N=81-160 as a function of the range of the potential (with potential range rho0>or=3.0). Moreover, compared to the results for N<or=80 listed in the Cambridge Cluster Database, a number of new putative global minima are given. A structural and conformational analysis of M100 for different rho0 wa...

Eukaryotic cells devoid of mitochondrial DNA (rho0 cells) were originally generated under artificial growth conditions utilizing ethidium bromide. The chemical is known to intercalate preferentially with the mitochondrial double-stranded DNA thereby interfering with enzymes of the replication machinery. Rho0 cell lines are highly valuable tools to study human mitochondrial disorders because the...

The mammalian plasma membrane (PM) NADH-oxidoreductase (PMOR) system is a multi-enzyme complex located in the plasma membrane of all eukaryotic cells, harboring at least two distinct activities, the plasma membrane NADH-ferricyanide reductase and the NADH-oxidase. To assess the behaviour of the two activities of the PMOR system, we measured the NADH-ferricyanide reductase and NADH-oxidase activ...

In the present study, we used mitochondrial DNA-depleted Jurkat subclones (rho0 cells) to demonstrate that Fas agonistic Ab (CH-11), at the concentrations that evoke apoptotic death of the parental Jurkat cells, induced necrosis mainly through generation of excess reactive oxygen species, lysosomal rupture, and sequential activation of cathepsins B and D, and in minor part through activation of...

Mitochondrial DNA (mtDNA) mutations are frequently found in a variety of tumors. However, the role of mtDNA mutations in tumor behavior is poorly understood. We explored the effects of mtDNA mutations on tumor phenotype employing mtDNA-depleted SK-Hep1 rho0 hepatoma cells. Expression of hypoxia inducible factor (HIF)-2alpha mRNA was markedly increased in rho0 cells compared to control cells. Pr...

OBJECTIVES To understand the role of mitochondrial respiration in cisplatin sensitivity, we have employed wild-type and mitochondrial DNA depleted Rho0 yeast cells. MATERIALS AND METHODS Wild type and Rho0 yeast cultured in fermentable and non-fermentable sugar containing media, were studied for their sensitivity against cisplatin by monitoring growth curves, oxygen consumption, pH changes in...

The purpose of this study was to evaluate the impact of mitochondrial DNA (mtDNA) on radiation sensitivity under hypoxic conditions. The cell lines used were rho+ and rho0, which carry wild-type mtDNA and no mtDNA, respectively. The rho0 cells do not utilize oxygen because they lack the capacity to carry out oxidative phosphorylation. To confirm the role played by mtDNA in different cell lines,...

Objective(s): To understand the role of mitochondrial respiration in cisplatin sensitivity, we have employed wild-type and mitochondrial DNA depleted Rho0 yeast cells. Materials and Methods: Wild type and Rho0 yeast cultured in fermentable and non-fermentable sugar containing media, were studied for their sensitivity against cisplatin by monitoring growth curves, oxygen consumption, pH changes ...

objective(s): to understand the role of mitochondrial respiration in cisplatin sensitivity, we have employed wild-type and mitochondrial dna depleted rho0 yeast cells. materials and methods: wild type and rho0 yeast cultured in fermentable and non-fermentable sugar containing media, were studied for their sensitivity against cisplatin by monitoring growth curves, oxygen consumption, ph changes ...

Hypoxia-inducible factor (HIF) mediates a large number of transcriptional responses to hypoxia and has an important role in processes that include angiogenesis and erythropoiesis. The HIF DNA binding complex consists of 2 basic-helix-loop-helix PAS proteins designated alpha and beta subunits. Regulation occurs principally through the alpha subunits, which are stabilized and activated in hypoxia...