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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Glutathione protects metastatic melanoma cells against oxidative stress in the murine hepatic microvasculature.

Calcein-labeled B16 melanoma (B16M) cells were injected intraportally, and in vivo video microscopy was used to study the distribution and damage of cancer cells arrested in the liver microvasculature over a period of 4 hours. The contribution of glutathione (GSH)-dependent antioxidant machinery to the possible oxidative stress-resistance mechanism of B16M cell was determined by in vitro incubation with the selective inhibitor of GSH synthesis L-buthionine (S,R)-sulphoximine (BSO) before B16M cell injection in untreated and 0.5-mg/kg lipopolysaccharide (LPS)-treated mice. In addition, untreated and LPS-treated isolated syngeneic hepatic sinusoidal endothelial cells (HSE) were used to determine in vitro their specific contribution to B16M cell damage. Trauma inherent to intrasinusoidal lodgement damaged 35% of B16M cells in both normal and LPS-treated mouse liver. The rest of the arrested B16M cells remained intact in normal liver for at least 4 hours, although their damaged cell percentage significantly (P < .05) increased since the second hour in normal mice injected with BSO-treated cells and since the first hour in LPS-treated mice given untreated cells. Recombinant human interleukin-1 receptor antagonist (rHuIL-1-Ra) given to mice 15 minutes before LPS significantly (P < .05) abrogated B16M cell damage. On the other hand, 40% of the B16M cells co-cultured with unstimulated HSE and 70% of the co-cultured with LPS-treated HSE became sensitive to endothelial cell-mediated damage after BSO treatment. These results demonstrate that a high intracellular level of GSH protects B16M cells from possible in vivo and in vitro sinusoidal cell-mediated oxidative stress, contributing to the mechanism of metastatic cell survival within the hepatic microvasculature.[1]

References

  1. Glutathione protects metastatic melanoma cells against oxidative stress in the murine hepatic microvasculature. Anasagasti, M.J., Martin, J.J., Mendoza, L., Obrador, E., Estrela, J.M., McCuskey, R.S., Vidal-Vanaclocha, F. Hepatology (1998) [Pubmed]
 
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