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Program - Society of Toxicology

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50 th Anniversary Annual Meeting and ToxExpo<br />

<strong>Program</strong> Description (Continued)<br />

Wednesday<br />

Abstract # Abstract #<br />

#2452 2:07 USING NEURAL PROGENITOR CELLS<br />

IN HIGH-THROUGHPUT SCREENS FOR<br />

DEVELOPMENTAL NEUROTOXICANTS:<br />

TRIUMPHS AND TRAGEDIES. ​T. J. Shafer, M.<br />

Culbreth, J. M. Breier and W. R. Mundy. Integrated<br />

Systems <strong>Toxicology</strong>, U.S. EPA, Research Triangle<br />

Park, NC.<br />

#2453 2:39 TRENDS OF THE IPSC TECHNOLOGY<br />

FOR BIOMEDICAL RESEARCH AND CELL<br />

THERAPY: POTENTIAL OF PROTEIN-<br />

INDUCED IPSCS. ​K. Kim. McLean Hospital/<br />

Harvard Medical School, Belmont, MA. Sponsor: A.<br />

Bowman.<br />

#2454 3:11 IN VITRO MODELS OF ANGELMAN<br />

AND PRADER-WILLI SYNDROME VIA<br />

INDUCED PLURIPOTENT STEM CELL<br />

TECHNOLOGY. ​M. Lalande. Genetics and<br />

Developmental Biology, University <strong>of</strong> Connecticut<br />

Health Center, Farmington, CT.<br />

#2455 3:43 PATIENT-DERIVED STEM CELLS AS<br />

A TRANSLATIONAL MODEL FOR<br />

NEUROTOXICOLOGICAL RISK. ​A. B.<br />

Bowman. Neurology, Vanderbilt University,<br />

Nashville, TN.<br />

Wednesday Afternoon, March 9<br />

1:30 PM to 4:15 PM<br />

Room 145<br />

Toxicity Testing: State <strong>of</strong> Science and Strategies to<br />

Improve Public Health<br />

Symposium Session: The Use <strong>of</strong> Epidemiological Data and<br />

PBPK Modeling in a Risk Assessment: Manganese As a Case<br />

Study<br />

Chairperson(s): Harvey J. Clewell, The Hamner Institutes for Health<br />

Sciences, Research Triangle Park, NC, and Daniel Krewski, University <strong>of</strong><br />

Ottawa, Ottawa, Ontario, Canada.<br />

Sponsor:<br />

Metals Specialty Section<br />

Endorsed by:<br />

Biological Modeling Specialty Section<br />

Neurotoxicology Specialty Section<br />

Risk Assessment Specialty Section<br />

Manganese (Mn) is an essential element that is neurotoxic at high exposures.<br />

In recent years there has been increasing use <strong>of</strong> PBPK modeling in quantitative<br />

risk assessments to support animal-to-human extrapolation when human<br />

risk estimates are based on animal studies. However, any risk assessment<br />

for the neurological effects <strong>of</strong> Mn would likely be based on epidemiological<br />

data from occupational exposures to inhaled Mn in dust. Nevertheless, the<br />

risk assessment for manganese (Mn) provides an opportunity to apply PBPK<br />

modeling in a different aspect <strong>of</strong> quantitative risk assessment: replacing<br />

default uncertainty factors with chemical-specific adjustment factors. The<br />

critical issues in a Mn risk assessment based on occupational epidemiology<br />

data are the nature and extent <strong>of</strong> the uncertainty factors that should be<br />

applied to account for uncertainties regarding interindividual variability,<br />

susceptible sub-populations, duration <strong>of</strong> exposure, and different forms<br />

<strong>of</strong> Mn. We will describe the epidemiological evidence for the neurotoxic<br />

effects <strong>of</strong> Mn and explore the use <strong>of</strong> PBPK models for Mn in adult and<br />

perinatal animals and humans to predict the effect <strong>of</strong> key sources <strong>of</strong> uncertainty<br />

on the target tissue Mn dose, elucidate the dose-dependent mode <strong>of</strong><br />

action for the neurological effects <strong>of</strong> Mn, and quantify the impact <strong>of</strong> human<br />

variability, life-stage, and other uncertainties on risks estimated from occupational<br />

epidemiology studies.<br />

#2456 1:30 THE USE OF EPIDEMIOLOGICAL<br />

DATA AND PBPK MODELING IN A RISK<br />

ASSESSMENT: MANGANESE AS A CASE<br />

STUDY. ​H. J. Clewell 1 , M. Andersen 1 , V. Tait 2 ,<br />

H. Roels 3 and W. Boyes 4 . 1 The Hamner Institutes<br />

for Health Sciences, Research Triangle Park,<br />

NC, 2 University <strong>of</strong> Ottawa, Ottawa, ON, Canada,<br />

3<br />

Université Catholique de Louvain, Brussels,<br />

Belgium and 4 U.S. EPA, Research Triangle Park, NC.<br />

1:30 INTRODUCTION. ​Harvey Clewell<br />

#2457 1:35 COLLECTION OF CHEMICAL-<br />

SPECIFIC TOXICOLOGICAL AND<br />

PHARMACOKINETIC DATA TO IMPROVE<br />

RISK ASSESSMENTS BASED ON<br />

EPIDEMIOLOGY: EXAMPLE OF MN. ​W. K.<br />

Boyes. U.S. EPA, Research Triangle Park, NC.<br />

#2458 2:07 BIOMARKERS OF EXPOSURE TO<br />

MANGANESE AND PROSPECTIVE<br />

STUDIES OF ITS NEUROTOXIC EFFECTS<br />

IN OCCUPATIONAL COHORTS. ​H. A.<br />

Roels. Louvain Centre <strong>of</strong> <strong>Toxicology</strong> and Applied<br />

Pharmacology, Université catholique de Louvain,<br />

Brussels, Belgium. Sponsor: H. Clewell.<br />

#2459 2:39 THE USE OF PBPK MODELS FOR MONKEY<br />

AND HUMAN TO INVESTIGATE THE DOSE-<br />

RESPONSE FOR THE NEUROLOGICAL<br />

EFFECTS OF MN. ​H. J. Clewell 1 , J. D.<br />

Schroeter 1 , M. Yoon 1 , A. Nong 1 , M. D. Taylor 2 and<br />

M. E. Andersen 1 . 1 The Hamner Institutes for Health<br />

Sciences, Research Triangle Park, NC and 2 Afton<br />

Chemical, Richmond, VA.<br />

#2460 3:11 APPLICATION OF PBPK MODELING TO<br />

EVALUATE SAFE EXPOSURES TO A TOXIC<br />

BUT ESSENTIAL METAL. ​M. E. Andersen.<br />

Computational Biology, The Hamner Institutes for<br />

Health Sciences, Research Triangle Park, NC.<br />

#2461 3:43 HAZARD ASSESSMENT FOR THE<br />

ESSENTIAL ELEMENT MANGANESE<br />

BASED ON TOXICOLOGICAL,<br />

EPIDEMIOLOGICAL, AND MECHANISTIC<br />

DATA: SUSCEPTIBLE SUB-POPULATIONS<br />

AND INTER-INDIVIDUAL VARIABILITY. ​<br />

V. Tait 1,2 , F. Salehi 2 , M. Croteau 2 , N. Karyakina 1,2 ,<br />

N. Shilnikova 2 , A. Ngom 2 and D. Krewski 2,1 . 1 Risk<br />

Sciences International Inc., Ottawa, ON, Canada<br />

and 2 University <strong>of</strong> Ottawa, Ottawa, ON, Canada.<br />

Sponsor: M. Andersen.<br />

332<br />

Education-Career Development Sessions<br />

Exhibitor Hosted Sessions<br />

Featured Sessions<br />

Historical Highlights<br />

Informational Sessions<br />

Platform Sessions

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