Preformulation Studies of a Stable PTEN-PDZ Lipopeptide Able to Cross an In Vitro Blood-Brain-Barrier Model as a Potential Therapy for Alzheimer’s Disease

Aikaterini Lalatsa, Yujiao Sun, Jose Ignacio Gamboa, Shira Knafo

Research output: Contribution to journalArticlepeer-review


Purpose: Amyloid β (Aβ) drives the accumulation of excess Phosphatase and Tensin Homolog Deleted on Chromosome 10 (PTEN) at synapses, inducing synaptic depression and perturbing memory. This recruitment of PTEN to synapses in response to Aβ drives its interaction with PSD95/Disc large/Zonula occludens-1 (PDZ) proteins and, indeed, we previously showed that an oligo lipopeptide (PTEN-PDZ) capable of blocking such PTEN:PDZ interactions rescues the synaptic and cognitive deficits in a mouse model of Alzheimer’s disease. Hence, the PTEN:PDZ interaction appears to be crucial for Aβ-induced synaptic and cognitive impairment. Here we have evaluated the feasibility of using PTEN-PDZ lipopeptides based on the human/mouse PTEN C-terminal sequence, testing their stability in biological fluids, their cytotoxicity, their ability to self-assemble and their in vitro blood-brain barrier (BBB) permeability. Myristoyl or Lauryl tails were added to the peptides to enhance their cell permeability. Methods: Lipopeptides self assembly was assessed using electron microscopy and the thioflavin T assay. Stability studies in mouse plasma (50%), intestinal washing, brain and liver homogenates as well as permeability studies across an all human 2D blood-brain barrier model prepared with human cerebral endothelial cells (hCMEC/D3) and human astrocytes (SC-1800) were undertaken. Results: The mouse lauryl peptide displayed enhanced overall stability in plasma, ensuring a longer half-life in circulation that meant there were larger amounts available for transport across the BBB (Papp0-4h: 6.28 ± 1.85 × 10−6 cm s−1). Conclusion: This increased availability, coupled to adequate BBB permeability, makes this peptide a good candidate for therapeutic parenteral (intravenous, intramuscular) administration and nose-to-brain delivery. Graphical Abstract[Figure not available: see fulltext.]

Original languageEnglish
Article number183
JournalPharmaceutical Research
Issue number10
StatePublished - 1 Oct 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).


  • Alzheimer’s disease
  • blood-brain barrier
  • hCMEC/D3 human cerebral endothelial cells
  • PTEN-PDZ lipopeptides
  • stability
  • Cell Line
  • PTEN Phosphohydrolase/pharmacokinetics
  • Myristic Acid/chemistry
  • Half-Life
  • Male
  • Cell Survival/drug effects
  • Synapses/pathology
  • Animals
  • Endothelium, Vascular/drug effects
  • Blood-Brain Barrier/drug effects
  • Alzheimer Disease/drug therapy
  • Amyloid beta-Peptides
  • Mice
  • Sodium Dodecyl Sulfate/chemistry
  • Cognition Disorders/pathology
  • Lipopeptides
  • Zonula Occludens-1 Protein/pharmacokinetics
  • Benzothiazoles

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Molecular Medicine
  • Biotechnology
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry


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