Related Experiment Video
Updated: Jun 26, 2026

Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
Published on: March 24, 2023
Acrylamide: Consideration of species differences and nonlinear processes in estimating risk and safety for human
M L Gargas1, C R Kirman, L M Sweeney
1The Sapphire Group, Inc, Dayton, OH, United States.
Abstract:
Acrylamide in cooked foods results in wide-spread, low-level human exposure. Potential risks from dietary intake remain unclear due to apparent conflicting results from cancer bioassays conducted in rats that reported tumors and epidemiology studies that are suggestive but provide little or no evidence of increased cancer. Risk estimation often includes two common assumptions: (1) tumor response rates in test species can be extrapolated systematically to estimate human response rates and (2) tumor rates observed following high-dose exposures can be linearly extrapolated to predict response rates following low-dose exposures. The validity of these assumptions was evaluated for acrylamide based upon the examination of relevant toxicokinetic and toxicodynamic differences between humans and rats, including sources of nonlinearity that modify high to low dose extrapolation of cancer incidence. Important species differences and sources of nonlinearity are identified, and recommendations for addressing them within the quantitative framework of a PBTK/TD model are discussed. These differences are likely to estimate risk levels up to several orders of magnitude lower in humans than in rats. Quantitative inclusion of these TK/TD factors will more closely estimate actual human cancer risk derived from high-dose rodent studies, since detoxification processes for acrylamide and glycidamide appear adequately protective against toxicity from human dietary doses.
More Related Videos
Related Concept Videos
Physical Properties of Amines
Toxicity Testing in Animals
Mutagenicity and Carcinogenicity
Toxic Reactions: Overview
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Drug Toxicity: Risk factors

