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Ascorbic acid and ascorbate-2-phosphate decrease HIF activity and malignant properties of human melanoma cells.

Sarah L Miles1, Adam P Fischer2, Sandeep J Joshi3

  • 1Department of Biochemistry and Microbiology, Joan C. Edwards School of Medicine, Marshall University, One John Marshall Drive, Huntington, WV, 25755, USA. kittlaus1@marshall.edu.

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This summary is machine-generated.

Ascorbic acid (AA) and its analog A2P reduce hypoxia-inducible factor-1 alpha (HIF-1α) in melanoma, decreasing cancer cell invasion. This suggests AA plays a key role in regulating HIF-1α and offers potential therapeutic avenues for melanoma treatment.

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Area of Science:

  • Oncology
  • Biochemistry
  • Molecular Biology

Background:

  • Hypoxia-inducible factor-1 alpha (HIF-1α) is implicated in melanoma development.
  • Ascorbic acid (AA) is a cofactor for HIF-1α regulatory enzymes (PHD, FIH).
  • Depleted intra-tumoral AA may impair HIF-1α regulation in melanoma.

Purpose of the Study:

  • To assess ascorbic acid's (AA) ability to reduce HIF-1α protein and transcriptional activity in metastatic melanoma.
  • To evaluate the impact of AA on melanoma cell invasiveness.

Main Methods:

  • HIF-1α protein levels assessed by Western blot.
  • Transcriptional activity measured using HIF-1 HRE-luciferase reporter assays.
  • Melanoma cells treated with AA and ascorbate 2-phosphate (A2P); PHD2 knockdown performed using siRNA; Matrigel invasion assays conducted.

Main Results:

  • Both AA and A2P inhibited HIF-1α stabilization and activity under various conditions.
  • AA reduced normoxic HIF-1α even when PHD2 was depleted.
  • A2P significantly reduced melanoma cell invasion through Matrigel.

Conclusions:

  • Ascorbic acid (AA) and A2P effectively reduce HIF-1α in metastatic melanoma.
  • AA supports PHD/FIH activity and may have additional non-PHD/FIH roles in HIF-1α regulation.
  • A2P's potential to inhibit melanoma progression and enhance therapy warrants further study.