title: A 96-well flow cytometric screening assay for detecting in vitro phospholipidosis-induction in the drug discovery phase.
abstract: Drug-induced phospholipidosis is caused by lysosomal accumulation of the drug, resulting in the disturbance of phospholipid degradation and a consequent excessive phospholipid accumulation. Depending on the type and number of tissues affected, phospholipidosis occurrence in test animals can raise safety issues, which may be critical for the risk assessment. Safety profiling of potential phospholipidosis-inducing drugs in the drug discovery phase can predict these late obstructions of drug development. For this purpose, a flow cytometric assay based on the difference in fluorescent phospholipid accumulation in a human monocyte cell line was initially established. Modifying the assay studying degradation of the fluorescent phospholipids instead of accumulation drastically improved sensitivity. By testing various phospholipidosis-inducers and negative compounds, it was found that the assay could detect the occurrence of phospholipidosis by a 2-fold difference in fluorescence compared to control cells, demonstrating the superior sensitivity of the novel approach. Implementation of a higher throughput 96-well flow cytometric set up did not affect the sensitivity of detection or the reproducibility of the assay. Based on an extended test set of reference compounds a profiling approach was introduced, by which we show we can rank our drug candidates according to their phospholipidosis-inducing potential.
authors.affiliation: Global Preclinical Development, Johnson&Johnson Pharmaceutical Research and Development (J&JPRD), 2340 Beerse, Belgium. nmesens@prdbe.jnj.com
authors.forename: Mesens
authors.initials: M
authors.lastname: Natalie
authors.forename: Steemans
authors.initials: S
authors.lastname: Margino
authors.forename: Hansen
authors.initials: H
authors.lastname: Erik
authors.forename: Peters
authors.initials: P
authors.lastname: Annelieke
authors.forename: Verheyen
authors.initials: V
authors.lastname: Geert
authors.forename: Vanparys
authors.initials: V
authors.lastname: Philippe
mesh_terms: D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical / Q000379:methods*; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D008064:Lipidoses / Q000139:chemically induced* / Q000378:metabolism; D009000:Monocytes / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D010743:Phospholipids / Q000378:metabolism; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D018675:Toxicity Tests / Q000379:methods*; D015262:Xenobiotics / Q000494:pharmacology*
chemical_list: D010743:Phospholipids; D015262:Xenobiotics