Related Experiment Video
Updated: Jun 12, 2025
07:56
Measuring Skeletal Muscle Thermogenesis in Mice and Rats
Published on: July 27, 2022
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JNK signaling dominance in hyperthermia
Atsushi Enomoto1, Takemichi Fukasawa2
1Laboratory of Molecular Radiology, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
Cell Stress & Chaperones
|May 8, 2025
Summary
Hyperthermia treatment activates JNK signaling by degrading JNK phosphatases. ERK signaling is transiently phosphorylated with ERK phosphatase induction, revealing distinct MAPK responses to heat stress.
Area of Science:
- Biochemistry
- Cellular Biology
- Oncology
Background:
- Hyperthermia is an anticancer therapy that uses heat stress to activate cellular signaling pathways.
- Mitogen-activated protein kinases (MAPKs) are crucial in signal transduction, with ERK, p38, and JNK as major mammalian groups.
- Understanding differential MAPK regulation by temperature is vital for optimizing hyperthermia treatments.
Purpose of the Study:
- To investigate the distinct regulatory mechanisms of extracellular signal-regulated protein kinases (ERK) and c-Jun NH2-terminal kinases (JNK) during hyperthermia.
- To elucidate the temperature-dependent activation patterns of ERK and JNK signaling pathways.
Main Methods:
- Cellular models exposed to controlled hyperthermia.
- Analysis of MAPK phosphorylation and phosphatase activity.
- Western blotting and phosphatase assays to quantify protein levels and activity.
Main Results:
- JNK activation demonstrated a clear temperature-dependent pattern.
- JNK phosphatases were degraded under hyperthermia.
- ERK phosphorylation was transient, accompanied by the induction of ERK phosphatases.
Conclusions:
- Hyperthermia differentially regulates ERK and JNK signaling cascades.
- JNK pathway activation is sustained through phosphatase degradation, while ERK activation is transient.
- These findings provide insights into the molecular mechanisms underlying hyperthermia's effects on cellular signaling.
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