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1
Research and Development and Manufacturing Department for Diagnostics, Diagnostic Science Division, Shionogi & Co., Ltd., 2-5-1, Mishima, Settsu, Osaka 566-0022, Japan.
2
First Department of Internal Medicine, Miyazaki Medical
College, 5200, Kihara, Kiyotake, Miyazaki 889-1601, Japan.
3
National Cardiovascular Center Research Institute,
5-7-1, Fujishirodai, Suita, Osaka 565-0873, Japan.
a Address correspondence to this author at: R & D Manufacturing Department for Diagnostics, Diagnostic Science Division, Shionogi & Co., Ltd., 2-5-1, Mishima, Settsu, Osaka 566-0022, Japan. Fax 81 6 6319 4109; e-mail hideki.ohta{at}shionogi.co.jp.
Adrenomedullin (AM) is a potent hypotensive peptide. Plasma contains mature-type AM (m-AM), which is amidated at the carboxy terminus, and an intermediate, AM-Gly. We developed a one-step two-site IRMA specific for determining human m-AM with monoclonal antibodies. The detection limit was 0.5 pmol/L, and the working range (CV <15%) was 1300 pmol/L. Dilution of plasma samples showed good linearity. The recovery of added AM was 91118%. The intra- and interassay imprecision values (CVs) were 4.48.2% and 5.58.3%, respectively. The assay had no cross-reactivity with AM-Gly or other peptides similar to AM. The mean (± SD) plasma human m-AM concentration of 61 healthy subjects was 1.18 ± 0.65 pmol/L. In conclusion, our IRMA makes it possible to specifically measure m-AM, using a small amount of plasma sample (0.2 mL) by a one-step overnight assay without prior extraction. Our simplified method would be suitable for clinical studies on AM, especially when large numbers of samples must be processed.
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