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ENOX2 target for the anticancer isoflavone ME-143.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • The ECTO-NOX (ENOX) protein family includes ENOX2 (tNOX), a cancer-specific cell surface protein implicated in tumor growth.
  • Synthetic isoflavones are being investigated for their anticancer properties.
  • ME-143 (NV-143) is a synthetic isoflavone undergoing clinical evaluation for cancer treatment.

Purpose of the Study:

  • To investigate the molecular mechanism of ME-143's anticancer activity.
  • To determine ME-143's effect on ENOX2 protein activity and binding.
  • To assess ME-143's impact on cancer cell growth and cell cycle progression.

Main Methods:

  • Assessed the inhibitory effects of ME-143 on ENOX2's oxidative and protein disulfide-thiol interchange activities.
  • Measured the binding affinity (Kd) of ME-143 to purified recombinant ENOX2.
  • Evaluated ME-143's impact on cancer cell growth (EC50) and cell cycle traversal.
  • Compared ME-143's effects on ENOX2 with its effects on the constitutive ENOX1 (CNOX) protein.

Main Results:

  • ME-143 inhibited ENOX2 activity with EC50s in the range of 20-50 nM.
  • ME-143 bound to ENOX2 with a dissociation constant (Kd) of 43 nM.
  • Inhibition of ENOX2's protein disulfide-thiol interchange activity correlated with suppressed cancer cell enlargement and cell cycle progression.
  • ME-143 did not affect the activity of ENOX1 (CNOX) in either cancer or non-cancer cells.

Conclusions:

  • ME-143 is a potent inhibitor of the cancer-specific ENOX2 protein.
  • The binding affinity of ME-143 to ENOX2 is significantly higher than that of phenoxodiol.
  • ME-143's inhibition of ENOX2 activity underlies its efficacy in inhibiting cancer cell growth and progression.