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Updated: Feb 18, 2026

Temporal Quantification of MAPK Induced Expression in Single Yeast Cells
Published on: October 4, 2013
Saccharomyces cerevisiae Hog1 MAP kinase pathway is activated in response to honokiol exposure
1Department of Pharmacology, Medical School of Southeast University, Nanjing, China.
Aim:
The goal of the study was to investigate the cellular tolerance mechanism in response to honokiol exposure.
Methods And Results:
The broth microdilution method was employed to test the sensitivity of different Saccharomyces cerevisiae strains to honokiol. Intracellular levels of reactive oxygen species (ROSs) were determined by DCFH-DA staining. The phosphorylation of Hog1 was evaluated by Western blot analysis. The mRNA expressions of genes involved in the Ras-cyclic AMP (cAMP) pathway were analysed by real-time reverse transcription polymerase chain reaction. We found that the sod1▵ mutant was hypersensitive to honokiol and produced more ROS compared with wild-type and sod2▵ cells. Hog1 was phosphorylated in response to honokiol exposure and deletion of HOG1 increased the sensitivity to honokiol. The expressions of genes involved in the Ras-cAMP pathway were down-regulated after honokiol exposure; exogenous cAMP significantly reduced the phosphorylation of Hog1, although the level was higher than the control level.
Conclusions:
In addition to SOD1, the Ras-cAMP cascade and Hog1 MAP kinase pathway is essential for protecting against honokiol-induced oxidative stress.
Significance And Impact Of The Study:
Our results provide insight into the understanding of the action mechanism of honokiol.
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