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Various stressors rapidly activate the p38-MAPK signaling pathway in Mytilus galloprovincialis (Lam.)

Catherine Gaitanaki1, Erene Kefaloyianni, Athina Marmari

  • 1Department of Animal and Human Physiology, School of Biology, Faculty of Sciences, University of Athens, Panepistimioupolis, Athens, Greece.

Molecular and Cellular Biochemistry
|July 2, 2004
PubMed

Insights

The marine bivalve M. galloprovincialis activates the p38-MAPK pathway in response to various stressors like oxidative stress and changes in salinity. This study reveals the pathway

Area of Science:

  • Marine Biology
  • Cell Signaling
  • Environmental Stress Response

Background:

  • The p38-MAPK pathway is crucial for cellular responses to stress.
  • Understanding stress signaling in marine invertebrates is vital for ecotoxicology.

Purpose of the Study:

  • To investigate the activation of the p38-MAPK pathway in the marine bivalve M. galloprovincialis under various stress conditions.
  • To elucidate the role of p38-MAPK in vivo stress response in marine invertebrates.

Main Methods:

  • Exposure of M. galloprovincialis to oxidative stress (H2O2), aerial exposure, osmotic stress (sorbitol, salinity changes), and hypertonicity.
  • Quantification of p38-MAPK phosphorylation levels using Western blotting or similar techniques.
  • Inhibition of p38-MAPK activity using SB203580.

Main Results:

  • Oxidative stress and aerial exposure induced biphasic p38-MAPK phosphorylation.
  • SB203580 inhibited stress-induced p38-MAPK phosphorylation.
  • Changes in salinity and hypertonicity also modulated p38-MAPK activity, demonstrating in vivo pathway activation.

Conclusions:

  • The p38-MAPK pathway is specifically activated by diverse environmental stressors in M. galloprovincialis.
  • This study provides the first evidence of in vivo p38-MAPK activation by multiple stressors in a marine invertebrate.
  • The findings highlight the conserved role of p38-MAPK in stress response across different organisms.

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