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DNA damage and p53-mediated growth arrest in human cells treated with platinum nanoparticles

P V Asharani1, Ng Xinyi, M Prakash Hande

  • 1Department of Chemistry, Faculty of Science, 3 Science Drive 3, National University of Singapore, Singapore. phsmph@nus.edu.sg

Nanomedicine (London, England)
|December 23, 2009
PubMed
Abstract

Insights

Platinum nanoparticles (Pt-NPs) enter human cells, causing DNA damage and apoptosis via p53 activation. Some cells recover, suggesting potential for Pt-NP-based anticancer therapies.

Area of Science:

  • Nanomedicine
  • Cellular Biology
  • Toxicology

Background:

  • Platinum-based drugs are vital therapeutics.
  • Understanding platinum nanoparticle (Pt-NP) cellular mechanisms is crucial.
  • Pt-NPs (5-8 nm) are investigated for their biological effects.

Purpose of the Study:

  • Investigate Pt-NP uptake in human cells.
  • Evaluate Pt-NP bioactivity, including cytotoxicity and genotoxicity.
  • Analyze Pt-NP effects on protein expression.

Main Methods:

  • Synthesized and characterized polyvinyl alcohol-capped Pt-NPs.
  • Incubated Pt-NPs with human cells.
  • Assessed metabolic activity, genome integrity, cell cycle, and protein expression.

Main Results:

  • Pt-NPs diffused into the cytoplasm.
  • Pt-NP exposure induced DNA damage, S-phase arrest, and apoptosis.
  • p53 pathway activation (p53, p-p53, p21) was observed, with PCNA downregulation.

Conclusions:

  • Genotoxic stress from Pt-NPs activates the p53/p21 pathway, causing growth arrest and apoptosis.
  • Cellular recovery and colony formation indicate resilience.
  • Pt-NPs show promise for developing novel anticancer agents with surface modifications.

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