Sulfite Toxicity Assessment in Biological Systems
Summary
Sulfites, in the form of sulphur dioxide and its hydrated salts, are extensively employed as preservatives, antioxidants and processing aids across the food, pharmaceutical and industrial sectors. In biological systems, endogenously produced sulfite is normally oxidised to sulfate by mitochondrial sulphite oxidase, preventing accumulation. Toxicity arises when exposure overwhelms detoxification pathways, leading to formation of reactive sulphur trioxide radical anions, oxidative stress, protein-DNA adducts and inflammatory cascades. Assessment of sulfite toxicity integrates chemical analysis of exposure levels, in vitro assays of cell viability and free-radical generation, in vivo inhalation or ingestion studies with histopathology and bronchoalveolar lavage fluid markers, and emerging omics-based profiling of genetic and metabolic responses. Variations in species-specific enzymatic capacities, co-exposures to potentiating agents and the form of sulphur compound all influence outcome. Globally, rigorous evaluation of sulfite toxicity underpins regulatory limits in food safety, guides clinical monitoring of hypersensitive individuals and informs industrial hygiene standards for airborne sulphur dioxide.
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Sulfite Toxicity Assessment in Biological Systems publication trend
The graph below shows the total number of articles in sulfite toxicity assessment in biological systems across all publications each year (not limited to Nature Index journals).
Technical terms
Sulfite (SO₃²⁻): The conjugate base of sulfurous acid, used industrially as a preservative and generated in vivo following inhalation of sulfur dioxide.
Reactive sulfur trioxide radical anion (SO₃•⁻): A sulphur-centred free radical formed during enzymatic or chemical oxidation of sulfite, implicated in oxidative tissue damage.
Retromer complex: A multimeric protein assembly that mediates endosomal sorting and recycling of membrane proteins, critical for cellular responses to toxic insults.
Bronchoalveolar lavage fluid (BALF): Fluid collected from the lower respiratory tract to assess cellular injury and inflammatory markers following inhalation exposures.
Metaplasia: A reversible adaptive change in which one differentiated cell type is replaced by another in response to chronic injury or stress.
References
- The formation of sulfur trioxide radical anion during the prostaglandin hydroperoxidase-catalyzed oxidation of bisulfite (hydrated sulfur dioxide).. Journal of Biological Chemistry (1982).
- Potentiation of Sodium Metabisulfite Toxicity by Propylene Glycol in Both in Vitro and in Vivo Systems. Frontiers in Pharmacology (2018).
- Retromer Complex and PI3K Complex II-Related Genes Mediate the Yeast (Saccharomyces cerevisiae) Sodium Metabisulfite Resistance Response. Cells (2021).
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