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Related Experiment Videos

Generalized blocking in S phase by methotrexate.

J R Savage1, R Prasad

  • 1Medical Research Council, Radiobiology Unit, Didcot, Oxon, Great Britain.

Mutation Research
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Methotrexate (MTX) failed to effectively synchronize hamster fibroblast cells for prometaphase studies. Aged MTX showed no cell cycle perturbation, while new MTX caused general cell cycle slowing, not specific blocking.

Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • High-resolution chromosome banding requires synchronized cell populations, specifically at prometaphase.
  • Methotrexate (MTX) and bromodeoxyuridine (BrdU) release are commonly used to achieve cell cycle synchronization.

Purpose of the Study:

  • To evaluate the efficacy of a methotrexate (MTX) block and bromodeoxyuridine (BrdU) release schedule for enhancing prometaphase cell frequency in Syrian hamster fibroblasts.
  • To analyze the cell cycle perturbation and identify potential blocking sites using replication banding.

Main Methods:

  • Untransformed Syrian hamster fibroblasts were treated with MTX.
  • Cells were released from the MTX block using BrdU.
  • The cell cycle recovery wave was sampled, and sub-phase analysis was performed using BrdU replication bands.

Related Experiment Videos

Main Results:

  • An aged batch of MTX (Sigma, >2 years old) showed no significant cell cycle perturbation.
  • New batches of MTX (Sigma, Lederle) induced fluctuations in mitotic index, suggesting general cell cycle slowing rather than specific blocking.
  • No evidence of a specific cell cycle blocking site was observed with new MTX batches.
  • Cells treated with new MTX continued through the cell cycle in the same order as untreated controls upon release.

Conclusions:

  • The typical MTX block/BrdU release schedule was ineffective in synchronizing Syrian hamster fibroblasts for prometaphase studies.
  • The age and source of MTX can influence its toxicity and cell cycle perturbation effects.
  • Further optimization of synchronization protocols is necessary for high-resolution banding studies in this cell type.