The protective role of (-)-epigallocatechin-3-gallate in thrombin-induced neuronal cell apoptosis and JNK-MAPK activation

Neuroreport. 2015 May 6;26(7):416-23. doi: 10.1097/WNR.0000000000000363.

Abstract

(-)-Epigallocatechin-3-gallate (EGCG), the major polyphenolic component of green tea, has anti-inflammatory and antioxidant properties and provides neuroprotection against central nervous system diseases. Yet, it is not known whether EGCG may be neuroprotective against intracerebral hemorrhage. In this study, we used a simplified in-vitro model of thrombin neurotoxicity to test whether EGCG provides neuroprotection against thrombin-associated toxicity. Exposure of primary cortical neurons to thrombin (100 U/ml) caused dose-dependent and time-dependent cytotoxicity. Cell Counting Kit 8 and lactate dehydrogenase were used to monitor cell viability after exposure of neurons to thrombin or EGCG and after EGCG pretreatment. Flow cytometric analysis and western blotting demonstrated that thrombin-induced neuron degeneration occurs through apoptosis. A concentration of 25 μM EGCG significantly abolished thrombin-induced toxicity and prevented apoptosis by suppressing c-Jun-N-terminal kinase (JNK) phosphorylation, and the JNK inhibitor SP600125 reduced thrombin-induced caspase 3 activation and apoptosis. These data suggest that EGCG may have protective effects against thrombin-induced neuroapoptosis by inhibiting the activation of JNK, leading to caspase 3 cleavage. EGCG is a novel candidate neuroprotective agent against intracerebral hemorrhage-induced neurotoxicity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anthracenes / pharmacology
  • Apoptosis / drug effects*
  • Apoptosis / physiology
  • Caspase 3 / metabolism
  • Catechin / analogs & derivatives*
  • Catechin / pharmacology
  • Cell Survival / drug effects
  • Cell Survival / physiology
  • Cells, Cultured
  • Cerebral Cortex / drug effects
  • Cerebral Cortex / physiology
  • Dose-Response Relationship, Drug
  • Enzyme Inhibitors / pharmacology
  • L-Lactate Dehydrogenase / metabolism
  • MAP Kinase Kinase 4 / antagonists & inhibitors
  • MAP Kinase Kinase 4 / metabolism
  • Neurons / drug effects*
  • Neurons / physiology
  • Neuroprotective Agents / pharmacology*
  • Phosphorylation / drug effects
  • Rats
  • Thrombin / toxicity*
  • Time Factors

Substances

  • Anthracenes
  • Enzyme Inhibitors
  • Neuroprotective Agents
  • pyrazolanthrone
  • Catechin
  • epigallocatechin gallate
  • L-Lactate Dehydrogenase
  • MAP Kinase Kinase 4
  • Thrombin
  • Casp3 protein, rat
  • Caspase 3