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Tumor-Specific S/G2-Phase Cell Cycle Arrest of Cancer Cells by Methionine Restriction

  • Robert M. HoffmanEmail author
  • Shuya Yano
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1866)

Abstract

Cancer cells require elevated amounts of methionine (MET) and arrest their growth under conditions of MET restriction (MR). This phenomenon is termed MET dependence. Fluorescence-activated cell sorting (FACS) first indicated that the MET-dependent SV40-transformed cancer cells were arrested in the S and G2 phases of the cell cycle when under MR. This is in contrast to a G1-phase accumulation of cells, which occurs only in MET-supplemented medium at very high cell densities and which is similar to the G1 cell-cycle block which occurs in cultures of normal fibroblasts at high density. When the human PC-3 prostate carcinoma cell line was cultured in MET-free, homocysteine-containing (METHCY+) medium, there was an extreme increment in DNA content without cell division indicating that the cells were blocked in S phase. Recombinant methioninase (rMETase) treatment of cancer cells also selectively trapped cancer cells in S/G2: The cell cycle phase of the cancer cells was visualized with the fluorescence ubiquitination cell cycle indicator (FUCCI). At the time of rMETase-induced S/G2-phase trap, identified by the cancer cells’ green fluorescence by FUCCI imaging, the cancer cells were administered S-phase-dependent chemotherapy drugs, which interact with DNA or block DNA synthesis such as doxorubicin, cisplatin, or 5-fluorouracil (5-FU) and which were highly effective in killing the cancer cells. In contrast, treatment of cancer cells with drugs in the presence of MET, only led to the majority of the cancer cell population being blocked in G0/G1 phase, identified by the cancer cells becoming red fluorescent in the FUCCI system. The G0/G1 blocked cells were resistant to the chemotherapy. MR has the potential for highly effective cell-cycle-based treatment strategy for cancer in the clinic.

Key words

Cancer cells Methionine dependence Methionine restriction Cell cycle Arrest S/G2 phase, chemotherapy 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.AntiCancer, Inc.San DiegoUSA
  2. 2.Department of SurgeryUniversity of CaliforniaSan DiegoUSA

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