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Distribution of CPP-Protein Complexes in Freshly Resected Human Tissue Material.

Külliki Saar1, Helgi Saar2, Mats Hansen3

  • 1Institute of Molecular and Cell Biology, University of Tartu; Riia Street 23, 51010 Tartu, Estonia. kulliki.saar@ut.ee.

Pharmaceuticals (Basel, Switzerland)
|October 8, 2016
PubMed
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Cell-penetrating peptides (CPPs) enhanced the distribution of protein complexes in human tissues. These peptides showed a preference for normal tissue over cancerous tissue, suggesting potential for non-malignant gene therapy.

Area of Science:

  • Biomedical Sciences
  • Molecular Biology
  • Drug Delivery Systems

Background:

  • Cell-penetrating peptides (CPPs) are widely studied for drug delivery in cell cultures and animal models.
  • Limited research exists on CPP behavior within human tissues.
  • Understanding CPP distribution in human tissues is crucial for therapeutic applications.

Purpose of the Study:

  • To investigate the tissue distribution of CPP-protein complexes in human gynecological tissues ex vivo.
  • To compare the uptake of two CPPs, transportan and TAT-peptide, in epithelial versus muscular/connective tissues.
  • To evaluate CPP selectivity between cancerous and adjacent normal tissues.

Main Methods:

  • Ex vivo tissue-dipping experiments using human uterine and cervical tissue samples.
Keywords:
carcinomacell-penetrating peptidesex vivotissue selectivity

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  • Complexation of biotinylated CPPs with avidin-β-galactosidase (ABG).
  • Whole-mount X-gal staining for robust detection and visualization of CPP-ABG distribution.

    • Main Results:

    • Both transportan and TAT-peptide enhanced the tissue distribution of ABG.
    • CPPs demonstrated greater enhancement in normal tissues compared to cancerous tissues.
    • A notable selectivity of CPP-ABG complexes for normal tissue was observed in some specimens.

    Conclusions:

    • CPPs can effectively enhance the distribution of protein complexes within human tissues.
    • The observed selectivity for normal tissue suggests potential applications beyond cancer therapy.
    • CPPs may be valuable as local delivery agents for intrauterine gene therapy in benign gynecological conditions.