Development of a Sol Particle Homogeneous Immunoassay for Measuring Full-Length Selenoprotein P in Human Serum

Mutsumi Tanaka, Yoshiro Saito, Hirofumi Misu, Seiji Kato, Yuki Kita, Yumie Takeshita, Takehiro Kanamori, Toru Nagano, Masatoshi Nakagen, Takeshi Urabe, Toshinari Takamura, Shuichi Kaneko, Kazuhiko Takahashi, Naoto Matsuyama

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Background: Selenoprotein P (SeP), a selenium-rich extracellular glycoprotein, is the primary selenoprotein in the plasma. SeP plays an important role in the maintenance of selenium levels in the peripheral tissues. We developed a new sol particle homogeneous immunoassay (SPIA) for measuring full-length SeP (FL-SeP) levels in the human serum. Methods: We used colloidal gold particles coated with two types of anti-SeP monoclonal antibodies, one recognizing the N-terminal side domain of SeP and the other recognizing the C-terminal side domain. Results: The assay range was 0.2-9 mg/l, and the linearity was excellent. The within-day and between-day coefficients of variation ranged from 0.73% to 2.24% and 0.45% to 1.11%, respectively. Serum samples (n = 200) were examined using the newly developed assay system (employing a Model 7070 Hitachi automatic clinical analyzer) and the conventional enzyme-linked immunosorbent assay. These two methods were compared using the Passing-Bablok regression analysis; the resulting regression equation and correlation coefficient were y = 0.940x + 0.165 and r = 0.954, respectively. Conclusions: Our new SPIA assay is a fully automated homogeneous immunoassay that can be used in conjunction with various commercial analyzers. The assay was sensitive, precise, and suitable for clinical measurement of the FL-SeP in the human serum.

Original languageEnglish
Pages (from-to)114-122
Number of pages9
JournalJournal of Clinical Laboratory Analysis
Issue number2
Publication statusPublished - 2016 Mar 1


  • Colloidal gold
  • Diabetes
  • Homogeneous immunoassay
  • Metformin
  • Selenoprotein P


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