Validation of an autotaxin enzyme immunoassay in human serum samples and its application to hypoalbuminemia differentiation

Kazuhiro Nakamura, Koji Igarashi, Kazufumi Ide, Ryunosuke Ohkawa, Shigeo Okubo, Hiromitsu Yokota, Akiko Masuda, Noriko Oshima, Takumi Takeuchi, Masaomi Nangaku, Shinichi Okudaira, Hiroyuki Arai, Hitoshi Ikeda, Junken Aoki, Yutaka Yatomi

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

Background: Autotaxin (ATX), a tumor cell motility-stimulating factor, regulates the blood concentrations of lysophosphatidic acid (LPA), an important and multi-functional bioactive lipid, through its lysophospholipase D activity (lysoPLD). The introduction of ATX measurements into clinical laboratory testing is urgently needed. Methods: Anti-human ATX monoclonal antibodies were produced by immunization of recombinant human ATX expressed in a baculovirus system. An immunoassay for the quantitative determination of ATX was established, and human serum samples were assayed. Results: The within-run and between-run precision, interference, detection limit, and linearity studies were satisfactory. The central 95 percentile reference interval for the serum ATX antigen concentration in healthy subjects was 0.468-1.134 mg/l (n = 120) and was strongly correlated with the serum lysoPLD activity. The ATX concentration was significantly (p < 0.001) higher in women (0.625-1.323 mg/l) than in men (0.438-0.914 mg/l). The serum ATX concentrations were increased in patients with chronic liver diseases and decreased in postoperative prostate cancer patients but were not altered in nephrosis patients. Thus, serum ATX antigen concentrations could be used to discriminate these hypoalbuminemia conditions. Conclusions: The present ATX antigen assay may be useful for clinical laboratory testing.

Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalClinica Chimica Acta
Volume388
Issue number1-2
DOIs
Publication statusPublished - 2008 Feb 1

Keywords

  • Autotaxin
  • Enzyme immunoassay
  • Hypoalbuminemia
  • Lysophosphatidic acid
  • Lysophospholipase D
  • Serum

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical

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