Abstract:
:The peritoneal mesothelium acts as a regulator of serosal responses to injury, infection, and neoplastic diseases. After inflammation of the serosal surfaces, proinflammatory cytokines induce an "activated" mesothelial cell phenotype, the mitochondrial aspect of which has not previously been studied. After incubation of cultured human peritoneal mesothelial cells with interleukin (IL)-1beta for 48 h, respiratory activity of suspended cells was analyzed by high-resolution respirometry. Citrate synthase (CS) and lactate dehydrogenase (LDH) activities were determined by spectrophotometry. Treatment with IL-1beta resulted in a significant decline of respiratory capacity (p < 0.05). Respiratory control ratios (i.e., uncoupled respiration at optimum carbonyl cyanide p-trifluoromethoxyphenylhydrazone concentration divided by oligomycin inhibited respiration measured in unpermeabilized cells) remained as high as 11, indicating well-coupled mitochondria and functional integrity of the inner mitochondrial membrane. Whereas respiratory capacities of the cells declined in proportion with decreased CS activity (p < 0.05), LDH activity increased (p < 0.05). Taken together, these results indicate that IL-1beta exposure of peritoneal mesothelial cells does not lead to irreversible defects or inhibition of specific components of the respiratory chain, but is associated with a decrease of mitochondrial content of the cells that is correlated with an increase in LDH (and thus glycolytic) capacity.
journal_name
Cell Biochem Biophysjournal_title
Cell biochemistry and biophysicsauthors
Stadlmann S,Renner K,Pollheimer J,Moser PL,Zeimet AG,Offner FA,Gnaiger Edoi
10.1385/CBB:44:2:179subject
Has Abstractpub_date
2006-01-01 00:00:00pages
179-86issue
2eissn
1085-9195issn
1559-0283pii
CBB:44:2:179journal_volume
44pub_type
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