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Methionine Restriction, Not Cysteine Restriction, Is a Cancer-specific Vulnerability.

Yuta Miyashi1,2,3, Kohei Mizuta1,2,3, Yohei Asano1,2

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|December 30, 2025
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Methionine restriction (MR) selectively targets cancer cells, unlike cysteine restriction (CR), which harms both normal and cancer cells. CR is not a cancer-specific vulnerability, limiting its therapeutic potential for inducing ferroptosis.

Keywords:
143B osteosarcoma cellsCysteineHCT116 colon cancer cellsHT1080 fibrosarcoma cellsHs27 human normal fibroblastscancer-specific vulnerabilityco-culturedependencemethionine

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Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Ferroptosis induction via cysteine restriction (CR) is a recent research focus in cancer.
  • Methionine restriction (MR) is an established cancer-specific vulnerability.

Purpose of the Study:

  • To compare the cancer-specific vulnerability of cysteine restriction (CR) against methionine restriction (MR).
  • To evaluate the therapeutic potential of CR for inducing ferroptosis in cancer cells.

Main Methods:

  • Co-culture of human cancer cell lines (HCT116, 143B, HT1080) with normal human fibroblasts (Hs27).
  • Culturing cells in media with depleted methionine, cysteine, or both.
  • Microscopic visualization of cell viability and proliferation.

Main Results:

  • Cysteine restriction (CR) demonstrated toxicity to both normal fibroblasts and cancer cell lines.
  • Methionine restriction (MR) was toxic exclusively to cancer cells, sparing normal fibroblasts.
  • Combined CR and MR exhibited toxicity to both normal and cancer cells.

Conclusions:

  • Methionine restriction (MR) represents a cancer-specific vulnerability.
  • Cysteine restriction (CR) is toxic to both normal and cancer cells, lacking cancer specificity.
  • CR is unlikely to be an effective cancer therapy for inducing ferroptosis due to its non-specific toxicity.