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Suzuki, N. et al.

Endothelin-3 concentrations in human plasma: the increased concentrations in patients undergoing haemodialysis.

Plasma immunoreactive endothelin-3 (ir-ET-3) concentrations were measured by a sandwich-enzyme immunoassay (sandwich-EIA) for endothelin-3 (ET-3). The assay method consists of two antibodies directed against N-terminal and C-terminal portions of ET-3. It detects as little as 0.1 pg/well of ET-3 without the crossreaction with endothelin-1, endothelin-2 and big ET-3. Plasma ir-ET-3 concentrations were found to be 0.45 +/- 0.07 pg/ml (mean +/- SD) in healthy volunteers, and were increased in patients undergoing haemodialysis (0.83 +/- 0.26 pg/ml, p less than 0.001). In reverse-phase HPLC, ir-ET-3 in normal plasma and in plasma of haemodialysis patients was eluted at the position of authentic ET-3, indicating that ir-ET-3 in plasma detected by the EIA was ET-3 itself. These results suggest that circulating ET-3 exists in normal human plasma and that production and/or metabolism of ET-3 may be altered in patients undergoing haemodialysis.[1]

References

Endothelin-3 concentrations in human plasma: the increased concentrations in patients undergoing haemodialysis. Suzuki, N., Matsumoto, H., Miyauchi, T., Goto, K., Masaki, T., Tsuda, M., Fujino, M. Biochem. Biophys. Res. Commun. (1990) [Pubmed]

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