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Related Experiment Videos

Calcitonin-derived carrier peptides.

I Neundorf1, A G Beck-Sickinger

  • 1Institute of Biochemistry, Faculty of Bioscience, Pharmacy and Psychology, University of Leipzig, Brüderstr. 34, D-04103 Leipzig, Germany.

Current Pharmaceutical Design
|November 25, 2005
PubMed
Summary

Carrier peptides like human calcitonin (hCT) fragment hCT(9-32) can deliver molecules into cells. Studies reveal its interaction with cell membranes suggests an endocytotic pathway for cellular uptake.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Medicine

Background:

  • Carrier peptides offer novel strategies for cytoplasmic delivery of bioactive molecules.
  • Human calcitonin (hCT) and its fragments have demonstrated translocation capabilities in nasal epithelium.
  • The hCT(9-32) fragment shows promise for internalizing various substances, including fluorophores, nucleic acids, and enhanced green fluorescent protein (EGFP).

Purpose of the Study:

  • To elucidate the mechanism by which the hCT(9-32) peptide facilitates the uptake of molecules into the cytoplasm.
  • To investigate the interactions between hCT(9-32) and model cell membranes with varying lipid compositions.
  • To determine the conformational changes of hCT(9-32) under membrane-like conditions.

Main Methods:

  • Investigated interactions of hCT(9-32) with lipid bilayers of diverse compositions.
  • Analyzed peptide conformation in the presence of membrane-mimicking environments.
  • Utilized fluorescence microscopy to observe the cellular uptake and distribution of truncated hCT sequences.

Main Results:

  • Interactions with membrane models provided insights into the peptide's conformational state.
  • Truncated hCT sequences demonstrated penetration of the plasma membrane.
  • Cellular distribution patterns supported an endocytotic internalization pathway.

Conclusions:

  • The hCT(9-32) fragment interacts with cell membranes, influencing its conformational state.
  • Evidence suggests that hCT-mediated cellular uptake occurs via an endocytotic mechanism.
  • Carrier peptides like hCT(9-32) represent a viable tool for intracellular delivery of diverse biomolecules.

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