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Related Experiment Videos

Cell-penetrating peptides: a comparative membrane toxicity study.

Külliki Saar1, Maria Lindgren, Mats Hansen

  • 1Department of Neurochemistry and Neurotoxicology, Stockholm University, SE10691 Stockholm, Sweden. kyllikis@neurochem.su.se

Analytical Biochemistry
|September 3, 2005
PubMed
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Cell-penetrating peptides (CPPs) show pharmaceutical promise but can cause toxicity. This study evaluated five CPPs on cancer and endothelial cells, finding some peptides safer than others for delivery applications.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Cell-penetrating peptides (CPPs) are promising drug delivery vectors.
  • High concentrations of CPPs can cause cell membrane damage and toxicity.
  • Understanding CPP toxicity is crucial for safe pharmaceutical applications.

Purpose of the Study:

  • To investigate the membrane toxicity of five well-characterized CPPs.
  • To compare the toxicity profiles of CPPs on human cancer and endothelial cell lines.
  • To identify safer CPPs for potential therapeutic use.

Main Methods:

  • Assessed membrane integrity using lactate dehydrogenase (LDH) leakage assay.
  • Measured plasma membrane potential changes with bis-oxonol fluorescence.

Related Experiment Videos

  • Tested five CPPs (pAntp(43-58), pTAT(48-60), pVEC(615-632), MAP, transportan 10) on K562, MDA-MB-231, and endothelial cells.

    • Main Results:

    • pAntp(43-58), pTAT(48-60), and pVEC(615-632) showed low LDH leakage and minimal fluorescence changes.
    • MAP and transportan 10 induced significant LDH leakage (40% in K562/MDA-MB-231 cells) and fluorescence increase.
    • No tested CPPs exhibited hemolytic activity comparable to mastoparan 7.

    Conclusions:

    • CPPs exhibit varying membrane toxicity profiles.
    • pAntp(43-58), pTAT(48-60), and pVEC(615-632) demonstrate a favorable safety profile for delivery applications.
    • Toxicity data is essential for selecting appropriate CPPs in drug development.