Acrylamide Toxicology and Neuroprotective Mechanisms

Acrylamide, a type-2 alkene formed during high-temperature cooking and used industrially, exerts neurotoxic effects through covalent modification of critical neuronal proteins and induction of oxidative stress. Its α,β-unsaturated carbonyl moiety reacts preferentially with nucleophilic cysteine thiolates in presynaptic proteins, disrupting vesicle cycling and neurotransmission. Peripheral neuropathies manifest as numbness, ataxia and muscle weakness, while central effects include anxiety and depression-like behaviours. Oxidative damage arising from reactive oxygen species compromises mitochondrial membrane potential, depletes glutathione and triggers lipid peroxidation, DNA fragmentation and apoptosis. Emerging neuroprotective strategies focus on antioxidants and electrophile scavengers—natural polyphenols, melatonin and dietary extracts—that preserve redox balance, stabilise mitochondrial function and inhibit protein adduction. Understanding the interplay between acrylamide’s chemical reactivity and cellular defence systems has paved the way for targeted interventions to mitigate its neurotoxic burden.

Research from Nature Portfolio

Recent studies using adult zebrafish models have characterised acute acrylamide neurotoxicity, revealing dose-dependent impairments in motor coordination alongside depression-like and anxiety phenotypes. Transcriptomic and proteomic analyses demonstrated down-regulation of regeneration-associated genes, altered glial marker expression and formation of specific protein–acrylamide adducts in presynaptic machinery, culminating in reduced monoamine neurotransmitter levels. Separately, an investigation of blackberry digests following in vitro gastrointestinal simulation identified phenolic compounds that attenuate acrylamide-induced oxidative stress. Pretreatment with these digests suppressed intracellular reactive oxygen species, prevented mitochondrial membrane potential decline and restored glutathione levels, thereby reducing cytotoxicity in cell models. These findings underscore both the detailed molecular targets of acrylamide in the nervous system and the promise of dietary antioxidants as protective agents.

Acrylamide Toxicology and Neuroprotective Mechanisms publication trend

The graph below shows the total number of articles in acrylamide toxicology and neuroprotective mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Electrophile: an electron-seeking chemical species that forms covalent bonds with nucleophilic sites in biomolecules.

Covalent adduct: a stable chemical bond formed between a toxicant and a cellular macromolecule such as a protein or DNA.

Reactive oxygen species (ROS): highly reactive oxygen derivatives that can damage lipids, proteins and nucleic acids.

Mitochondrial membrane potential (MMP): the electrochemical gradient across the inner mitochondrial membrane essential for ATP production.

Presynaptic vesicle cycling: the process of neurotransmitter release and vesicle recycling at the neuronal synapse.

References

1. Melatonin Attenuates Oxidative Damage Induced by Acrylamide In Vitro and In Vivo. Oxidative Medicine and Cellular Longevity (2015).
2. Acrylamide acute neurotoxicity in adult zebrafish. Scientific Reports (2018).
3. In vitro gastrointestinal digestion promotes the protective effect of blackberry extract against acrylamide-induced oxidative stress. Scientific Reports (2017).
4. Molecular Mechanism of Acrylamide Neurotoxicity: Lessons Learned from Organic Chemistry. Environmental Health Perspectives (2012).
5. Health effects of occupational exposure to acrylamide using hemoglobin adducts as biomarkers of internal dose.. Scandinavian Journal of Work, Environment & Health (2001).