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A Novel Soluble Peptide with pH-Responsive Membrane Insertion.

Vanessa P Nguyen1, Daiane S Alves1, Haden L Scott1

  • 1Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee , Knoxville, Tennessee 37996, United States.

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Researchers designed a novel peptide that targets cancer cell membranes in acidic tumor environments. This acidity-triggered rational membrane (ATRAM) peptide offers a promising strategy for targeted cancer therapy.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Extracellular acidification is a hallmark of diseases like cancer.
  • Targeting acidic tumor microenvironments offers a strategy for selective therapy delivery.

Purpose of the Study:

  • To rationally design a peptide that selectively targets cell membranes in acidic environments.
  • To develop a pH-dependent peptide for targeted drug delivery.

Main Methods:

  • First principles design of an acidity-triggered rational membrane (ATRAM) peptide.
  • Biophysical studies to characterize peptide-membrane interactions at different pH levels.
  • In vitro studies using human cell lines to assess targeting efficiency and toxicity.

Main Results:

  • ATRAM peptide exhibits high solubility and pH-dependent interaction with lipid membranes.
  • Peptide binds to membrane surface at pH 8.0 and inserts as a transmembrane α-helix upon acidification (pK of 6.5).
  • Efficient, non-toxic, pH-dependent membrane targeting observed in human cell lines.

Conclusions:

  • It is possible to rationally design soluble peptides for selective targeting of cell membranes in acidic conditions.
  • ATRAM peptide demonstrates potential for targeted therapies in acidic disease environments like solid tumors.