Diallyl sulfide induces heme oxygenase-1 through MAPK pathway

Area of Science:

• Biochemistry
• Cell Biology
• Toxicology

Background:

• Diallyl sulfide (DAS) exhibits protective effects against chemically induced liver damage, mutations, and cancer.
• The precise mechanisms underlying DAS's protective actions remain incompletely elucidated.

Purpose of the Study:

• To investigate the molecular mechanisms by which DAS confers protection against cellular damage.
• To determine the role of heme oxygenase-1 (HO-1) in DAS-mediated cytoprotection.

Main Methods:

• HepG2 cells were treated with varying concentrations and durations of DAS.
• Assays were performed to measure HO-1 protein and mRNA levels, Nrf2 activation, MAP kinase (ERK, p38) activity, and reactive oxygen species (ROS) production.
• The impact of N-Acetyl-cysteine on DAS-induced pathways was evaluated.
• Protective effects against hydrogen peroxide and arachidonic acid toxicity were assessed.

Main Results:

• DAS treatment dose- and time-dependently increased HO-1 protein and mRNA levels in HepG2 cells without inducing toxicity.
• DAS enhanced Nrf2 protein expression, nuclear translocation, and DNA-binding activity, alongside activating ERK and p38 MAP kinases.
• DAS stimulated a transient increase in ROS, which was critical for activating the ERK, Nrf2, and HO-1 pathways.
• Induced HO-1 expression conferred protection to HepG2 cells against oxidative and arachidonic acid-induced toxicity.

Conclusions:

• Diallyl sulfide induces heme oxygenase-1 expression through ROS production, with Nrf2 and MAPK signaling pathways mediating this induction.
• The upregulation of HO-1 is a key mechanism contributing to the protective effects of DAS against cellular damage.