Identification of a novel set of biomarkers for evaluating phospholipidosis-inducing potential of compounds using rat liver microarray data measured 24-h after single dose administration

Henrik T. Yudate, Toshihiro Kai, Mikio Aoki, Yohsuke Minowa, Toru Yamada, Toru Kimura, Atsushi Ono, Hiroshi Yamada, Yasuo Ohno, Tetsuro Urushidani

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Phospholipid accumulation manifests as an adverse effect of cationic amphiphilic drugs in particular. Detection, however, by histopathology examination is time-consuming and may require repeated administration of compounds for several weeks. To eliminate compounds with potential for inducing phospholipidosis from the discovery pipeline, we have identified and validated a set of biomarkers for predicting the phospholipidosis-inducing potential utilizing a comprehensive rat transcriptome microarray database created by the Japanese Toxicogenomics and Toxicogenomics Informatics Projects (TGP/TGP2) together with in-house data. The set of biomarkers comprising 25 Affymetrix GeneChip probe sets was identified using genetic algorithm optimization on 24-h time-point microarray data from rats treated with single doses of hepatotoxic compounds including amiodarone, clomipramine, haloperidol, hydroxyzine, imipramine, and perhexiline. The set of novel biomarkers represents an early time-point gene-expression pattern characteristic for a condition eventually leading to phospholipidosis. This implies significant advantages in terms of time and resources over currently published biomarkers derived using repeated-dosing late time-point data. The biomarker set was validated by 11 independent compounds. Accuracy, sensitivity, and specificity values were 82%, 67%, and 100%, respectively and the area under the receiver operating characteristic curve was 0.97. These results show that the biomarker set possesses a high classification accuracy for novel compounds. Pathway analysis was carried out for the biomarkers and the detection of pathways related to lipid-metabolism was statistically significant. These pathways most probably reflect lipid metabolism changes associated with phospholipidosis supporting the validity of our novel biomarkers.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalToxicology
Volume295
Issue number1-3
DOIs
Publication statusPublished - May 16 2012
Externally publishedYes

Keywords

  • Biomarker
  • Gene expression
  • Liver
  • Microarray
  • Phospholipidosis
  • Toxicogenomics

ASJC Scopus subject areas

  • Toxicology

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