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What's "normal", anyway? The cytotoxicity was determined by trypan blue-staining. Cytotoxicity of pentavalent and trivalent arsenic compounds in Hep G2 cells.
All experiments were performed in duplicate. The number of micronucleated cells was not significantly increased when cells were exposed to MMA V for 24 h Fig.
The formation of MN rose significantly at a tested concentration of 7. Micronucleus induction after exposure of CHO-9 cells to different concentrations of arsenite and arsenate for 24 h.
Only incubation of cells with 0. Using longer recovery periods 28 h and 35 h , this delay was not statistically significant anymore data not shown.
These compounds were chosen for electroporation experiments because they were negative in the MN assay under normal exposure conditions Figs. No significant differences in MN induction were observed between the unexposed control and the unexposed control after electroporation.
MN induction after electroporation of untreated and treated CHO cells. After exposure and electroporation the cells were treated with cytochalasin B for additional 24 h recovery time.
The experiments were repeated four times. We have shown that most of the arsenic species except DMA III and As i III in CHO-9 cells are not bound to cellular membranes, but are able to enter the cytosol no significant difference in arsenic concentration in whole-cell extract and membrane-removed cell extract.
The differences between DMA III as well as As i III concentrations in whole-cell extract and in membrane-removed cell extract may be explained by the presence of a specific exporter for these species.
The apparent lack of As i III export in Hep G2 cells may be explained by considering the high arsenic biotransformation capacity of hepatocytes.
Efficient biotransformation of inorganic arsenic to methylarsenic species would remove the need for the extrusion of As i III as a significant resistance mechanism.
Kessel et al. Arsenic can either enhance or reduce nitric oxide NO production, depending on the type of cell, the arsenic species, and the concentration of the tested arsenical.
Suppression of NO production has been shown to reduce arsenite-induced oxidative DNA damage and micronucleus formation Gurr et al.
An elevated resistance to As-induced genotoxicity in Hep G2 cells was reported by Gebel et al. The authors did not find elevated numbers of induced micronuclei in Hep G2 cells after arsenic exposure.
A cell-cycle delay in arsenite-treated human leukaemia cells was reported by McCabe et al. Kligerman et al.
In our study, a recovery period was instituted, i. Hence, in contrast to the results of McCabe et al. Taken together, these data indicate that arsenic compounds are able to temporarily delay the cell cycle, but that this delay is reversible.
These results are in agreement with data of previous studies published by Dopp et al. After an extended exposure time of 24 h and a recovery period of 14 h in the present study, the DMA III -induced cell-cycle delay was still detectable.
In conclusion, the presented results reveal that the uptake capabilities of arsenic compounds are dependent upon both the cell type and the arsenic species: We noted a resistance to intracellular accumulation of arsenic, either due to increased resistance at the uptake level or an enhanced efflux mechanism by Hep G2 cells in comparison to CHO-9 cells.
The induced genotoxic effects were directly correlated to the increased intracellular arsenic concentrations. The authors thank Prof.
Obe for instructive discussions. We also thank Mrs. Gabriele Zimmer for excellent technical assistance.
Conflict of interest: none declared. Aposhian, H. Enzymatic methylation of arsenic species and other new approaches to arsenic toxicity.
Occurrence of monomethylarsonous acid urine of humans exposed to inorganic arsenic. A review of the enzymology of arsenic metabolism and a new potential role of hydrogen peroxide in the detoxication of the trivalent arsenic species.
Bau, D. Health Perspect. Basu, A. Micronuclei as biomarkers of carcinogen exposure in populations exposed to arsenic through drinking water in West Bengal, India: A comparative study in three cell types.
Cancer Epidemiol. Biomarkers Prev. Bernstam, L. Molecular aspects of arsenic stress. Health B. Bhattacharjee, H. Arsenic defence mechanisms.
Broome-Smith, S. Baumberg, C. Sterling, and F. Ward, Eds. Society for General Microbiology, Leeds. Bun-ya, M.
Challenger, F. Biological methylation. Chemical Reviews 36 , — Dopp, E. Uptake of inorganic and organic derivatives of arsenic associated with induced cytotoxic and genotoxic effects in Chinese hamster ovary CHO cells.
Interindividual variation in the metabolism of arsenic in cultured primary human hepatocytes. Gebel, T. Low-level self tolerance to arsenite in human Hep G2 cells is associated with a depressed induction of micronuclei.
Goering, P. The enigma of arsenic carcinogenesis: Role of metabolism. Ghosh, M. Gong, Z. The wise man seeks the truth, the fool has already found it.
Fred Mastro. Agenda of course Do you want to go to an MDS seminar? In The World. Discover our schools. South Korea.
Discover the latest videos of courses, seminars and trainings. Martial Science Media. We both cried. He took my hand and wouldn't let go. Marvin was 13 when he went missing after being taken into a nearby care home after the death of his father.
He said goodbye to his carers before leaving to meet friends on June 11, in the town centre. He sent a final WhatsApp message at Police had been prepared to give up.
His discovery seems to have been by accident. At 7am on Friday police visited the home of Lars H with a van and a dog trained to sniff out hidden computer hard drives - suspected of containing child abuse images.
They found binbags full of used nappies - and an overwhelming smell of urine. The smell was so severe investigators had to work with face masks on.
And when officers opened a cupboard door an uninjured Marvin was standing in the darkness. He's exhausted, too. She added: 'He said, 'Mummy, I was locked away for two and a half years and I couldn't get any fresh air'.
He said, 'Mummy, take me home. He was actually wearing the same clothes he had on the day he disappeared. Lars H and a year-old man - reported to be his father - were arrested.
The older man was released but Lars H, an unemployed handyman, was kept in custody over the weekend.The role of active arsenic species produced by metabolic reduction of dimethylarsinic acid in genotoxicity and tumorigenesis. Welcome to the website of Fred Mastro, international Nostale Befehle in self-defense, specialist in knife fighting or any improvised weapon for over 20 years. These compounds were chosen for electroporation experiments because they were negative in the MN assay under normal exposure conditions Figs. Blazing Star Online Casino Mastro is a trainer in :. Chilling moment police swooped on schizophrenic Albanian woman, 30, in Escape Room Pc after she slashed throat Health B. Sign In or Create an Account. Enzymatic Casino Exchange Rate of arsenic species and other new approaches to arsenic toxicity. Cell counting was performed following trypan blue staining. Cell viability is expressed as percentage of surviving cells compared to the Super High Serie number of cells. Valency state. Sportbonus, T.