Journal
CELL DEATH AND DIFFERENTIATION
Volume 11, Issue 11, Pages 1204-1212Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.cdd.4401482
Keywords
TNF alpha-induced apoptosis; Mycoplasma fermentans; U937 cell line
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Mycoplasma fermentans ( M. fermentans) was shown to be involved in the alteration of several eukaryotic cell functions (i.e. cytokine production, gene expression), and was suggested as a causative agent in arthritic diseases involving impaired apoptosis. We investigated whether M. fermentans has a pathogenic potential by affecting tumor necrosis factor (TNF)alpha-induced apoptosis in the human myelomonocytic U937 cell line. A significant reduction in the TNFalpha-induced apoptosis (similar to60%) was demonstrated upon either infection with live M. fermentans or by stimulation with non-live M. fermentans. To investigate the mechanism of M. fermentans antiapoptotic effect, the reduction of mitochondrial transmembrane potential (DeltaPsi(m)) and the protease activity of caspase-8 were measured. In the infected cells, the reduction of DeltaPsi(m) was inhibited (similar to75%), and a similar to60% reduction of caspase-8 activity was measured. In conclusion, M. fermentans significantly inhibits TNFalpha-induced apoptosis in U937 cells, and its effect is upstream of the mitochondria and upstream of caspase-8.
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