Related Experiment Video
Updated: May 10, 2026

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)
Published on: May 10, 2016
Phenolic metabolites of benzene induced caspase-dependent cytotoxicities to K562 cells accompanied with decrease in
Yan Wang1, Guang-Yao Zhang, Qing-Ling Han
1School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China.
Benzene metabolites induce K562 cell apoptosis via caspase-8 and reactive oxygen species (ROS). Sialic acid metabolism alterations, particularly with hydroquinone and catechol, contribute to this process, impacting erythropoiesis.
Area of Science:
- Toxicology
- Cell Biology
- Biochemistry
Background:
- Benzene-induced erythropoietic depression is linked to toxic metabolite production.
- Investigating the specific cytotoxic effects of benzene metabolites on erythroid progenitor cells is crucial.
Purpose of the Study:
- To investigate the cytotoxicities of benzene metabolites (phenol, catechol, hydroquinone, 1,2,4-benzenetriol) on K562 cells.
- To elucidate the mechanisms of apoptosis induced by these metabolites, including caspase activation, ROS production, and cell surface changes.
Main Methods:
- Exposure of K562 cells to benzene metabolites.
- Assays for cell viability, apoptosis markers (caspase activity, phosphatidylserine exposure, Fas/FasL expression), reactive oxygen species (ROS) levels, and cell aggregation.
- Analysis of cell surface sialic acid levels and sialidase activity.
- Gene expression analysis of sialidase (Neu3) and sialyltransferase (ST3GAL3) mRNA.
Main Results:
- Benzene metabolites significantly inhibited K562 cell viability and induced apoptosis.
- Metabolites increased caspase-3, -8, and -9 activities, Fas/FasL expression, and ROS levels.
- Hydroquinone, catechol, and 1,2,4-benzenetriol decreased sialic acid and increased sialidase activity, unlike phenol.
- Specific gene expression changes in Neu3 and ST3GAL3 were observed for some metabolites.
Conclusions:
- Benzene metabolites induce K562 cell apoptosis primarily through a caspase-8-dependent pathway and ROS production.
- Sialic acid metabolism and associated enzyme activity changes play a role in the apoptotic process induced by certain benzene metabolites.
More Related Videos
08:49Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
Published on: January 22, 2019
05:27Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products
Published on: December 25, 2016
Related Concept Videos
Electrophilic Aromatic Substitution: Sulfonation of Benzene
Caspases
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Nucleophilic Aromatic Substitution: Elimination–Addition
Reactions at the Benzylic Position: Oxidation and Reduction
NMR Spectroscopy of Benzene Derivatives