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Modification of p21 level and cell cycle distribution by 50 Hz magnetic fields in human SH- SY5Y neuroblastoma cells

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Luukkonen J, Höytö A, Sokka M, Liimatainen A, Syväoja J, Juutilainen J, Naarala J · 2017

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The results suggest that extremely low frequency magnetic field exposure can modulate the G1 cell cycle checkpoint through alterations in p21 protein levels.

Plain English Summary

Summary written for general audiences

This in vitro study examined how 50 Hz magnetic field exposure affects DNA damage responses and cell cycle progression in human neuroblastoma cells. The researchers found that magnetic field pre-exposure decreased p21 protein levels after menadione treatment and altered cell cycle distribution, with increased G1 phase cells and decreased S phase cells.

Why This Matters

p21 is a cyclin-dependent kinase inhibitor critical for cell cycle regulation and DNA damage responses, making it a relevant biomarker for this investigation. The use of menadione as an oxidative stress inducer combined with magnetic field exposure represents a common experimental approach for studying potential synergistic cellular effects.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Luukkonen J, Höytö A, Sokka M, Liimatainen A, Syväoja J, Juutilainen J, Naarala J (2017). Modification of p21 level and cell cycle distribution by 50 Hz magnetic fields in human SH- SY5Y neuroblastoma cells.
Show BibTeX
@article{luukkonen_j_hyt_a_sokka_m_liimatainen_a_syvoja_j_juutilainen_j_naarala_j_ce4125,
  author = {Luukkonen J and Höytö A and Sokka M and Liimatainen A and Syväoja J and Juutilainen J and Naarala J},
  title = {Modification of p21 level and cell cycle distribution by 50 Hz magnetic fields in human SH- SY5Y neuroblastoma cells},
  year = {2017},
  doi = {10.1016/j.tiv.2017.06.030},
  
}
DOI: 10.1016/j.tiv.2017.06.030PubMed: 27646005

Quick Questions About This Study

No, while TCDD briefly increased harmful superoxide molecules in mitochondria immediately after exposure, researchers found no consistent long-term damage to mitochondrial integrity in human neuroblastoma cells at 8 or 15 days post-exposure.
No, TCDD exposure did not cause immediate genetic damage in human SH-SY5Y neuroblastoma cells. Researchers used micronucleus formation tests to assess DNA damage and found no significant immediate effects on genetic material.
Induced genomic instability (IGI) is delayed genetic damage that appears in cell offspring after the original exposure ends. It's considered a potential driving force in cancer development because it creates ongoing DNA damage even after toxin exposure stops.
No, significant induced genomic instability was not observed in this study. Despite causing brief mitochondrial stress, TCDD exposure did not lead to the persistent genetic instability that could promote cancer development in these brain cancer cells.
Mitochondrial superoxide production was significantly increased immediately after TCDD exposure, but effects were inconsistent at later time points. Only slight increases were observed at 15 days, suggesting the cellular stress response was largely temporary.