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Basic Science and Pathogenesis.

Carmen J Narvaez1, JoEllen Welsh2

  • 1SUNY Albany, RENSSELAER, NY, USA.

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Summary
This summary is machine-generated.

Menaquinone-4 (MK4), a form of vitamin K2, protects against ferroptosis, a cell death pathway implicated in Alzheimer's disease. This study shows MK4 enhances neuronal survival by suppressing ferroptosis in HT22 cells.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Ferroptosis, an iron-dependent cell death, contributes to neuronal loss in Alzheimer's disease (AD).
  • Glutathione Peroxidase-4 (GPX4) normally prevents ferroptosis, but its activity decreases with age.
  • Menaquinone-4 (MK4), a vitamin K2 form, can suppress ferroptosis via enzymatic reduction to MK4-H.

Purpose of the Study:

  • To investigate if MK4 suppresses ferroptosis in HT22 neuronal cells.
  • To determine MK4's efficacy in both proliferating and differentiated neuronal models.

Main Methods:

  • HT22 cells were treated with ferroptosis inducers (RSL3, FIN56, sulfasalazine, glutamate) with or without MK4.
  • Cell viability, morphology, and lipid peroxidation (Liperfluo) were assessed.
  • Expression of GPX4 and MK4-metabolizing enzymes (FSP1, VKORC1, VKORC1L1) was analyzed via Western blotting.

Main Results:

  • MK4 (0.05µM) significantly reduced cell death and lipid peroxidation induced by RSL3.
  • MK4 demonstrated protective effects in neurospheres and differentiated HT22 cells.
  • MK4 also protected against ferroptosis induced by sulfasalazine, glutamate, and FIN56, indicating broad efficacy.

Conclusions:

  • MK4 (vitamin K2) effectively suppresses ferroptosis across multiple induction pathways in HT22 cells.
  • GPX4 and MK4-metabolizing enzymes are expressed in HT22 cells, suggesting a cooperative role in ferroptosis suppression.
  • MK4 holds potential for promoting neuronal survival in conditions involving ferroptosis.