Title

PREDICTIVE VALUE OF HUMAN STEM CELLS FOR DEVELOPMENTAL NEUROTOXICITY TESTING

Introduction

The developing human nervous system is vulnerable to injury because cell growth, proliferation and maturation occur over a prolonged time period in utero and post- partum. Animal models of developmental neurotoxicity (DNT) are costly and have relatively low predictive value for humans.

Purpose

The purpose of this study was to utilize human pluripotent stem cells (hPSCs) in an in vitro model of neurogenesis and test its sensitivity to 4 widely used antiepileptic drugs (AEDs) associated with risks of neurological impairments in humans with perinatal exposure.

Method

The hPSC line TERA2.cl.SP12 was differentiated toward neural phenotypes with retinoic acid. The effects of phenobarbital (PHB), valproic acid (VPA), lamotrigine (LTG) and carbamazepine (CBZ) were examined on stem cell viability by the MTT assay, proliferation and apoptosis by flow cytometry and pluripotency and neurogenesis were investigated by immunocytochemistry.

Results

VPA dose-dependently reduced viable cell number and induced apoptosis whereas only high concentrations of PHB and CBZ induced apoptosis. Of the 4 drugs tested, VPA caused the greatest reduction in cell proliferation. All concentrations of PHB significantly reduced neurogenesis. In contrast, lower concentrations of VPA (10μM and 100μM) increased neurogenesis and only reduced it at the highest concentration tested (1000μM). LTG dose-dependently reduced viable cell number and moderately impaired neurogenesis. Only VPA reduced Oct-4 expression suggesting a reduction in stem cell pluripotency.

Significance

Our model shows differential sensitivity to the 4 antiepileptic drugs investigated, with PHB and VPA having the highest potential risk for DNT; these data correlate well with the increased risk of neurological malformations observed with these agents in epidemiological studies. Additionally, our data corresponds with in vivo data showing that VPA inhibits cell proliferation in the rodent brain and PHB impairs neurogenesis. We therefore report for the first time that the use of hPSCs as an in vitro model of neurogenesis might be a powerful alternative to animal-based methods of DNT testing and enable rapid evaluation of drug safety in the future.

Location

DeRosa University Center, Stockton campus, University of the Pacific

Format

Poster Presentation

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Mar 25th, 10:00 AM Mar 25th, 3:00 PM

PREDICTIVE VALUE OF HUMAN STEM CELLS FOR DEVELOPMENTAL NEUROTOXICITY TESTING

DeRosa University Center, Stockton campus, University of the Pacific

The developing human nervous system is vulnerable to injury because cell growth, proliferation and maturation occur over a prolonged time period in utero and post- partum. Animal models of developmental neurotoxicity (DNT) are costly and have relatively low predictive value for humans.