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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

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Mechanistic study of the sPLA2-mediated hydrolysis of a thio-ester pro anticancer ether lipid

Lars Linderoth1, Peter Fristrup, Martin Hansen

  • 1Department of Chemistry, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

Journal of the American Chemical Society
|August 12, 2009
PubMed

Insights

Secretory phospholipase A(2) (sPLA(2)) triggers drug release from liposomes. A novel thio-ester lipid optimizes this release, maintaining cancer cell toxicity for improved drug delivery.

Area of Science:

  • Biochemistry
  • Drug Delivery Systems
  • Molecular Biology

Background:

  • Secretory phospholipase A(2) (sPLA(2)) is overexpressed in tumors, making it a target for triggered liposomal drug delivery.
  • Previous systems utilized sPLA(2)-sensitive liposomes with ether lipids for targeted cancer therapy.

Purpose of the Study:

  • To optimize the hydrolysis rate of pro-anticancer ether lipids in liposomes for enhanced drug release.
  • To synthesize and evaluate a novel thio-ester pro-anticancer ether lipid for improved sPLA(2)-triggered liposomal drug delivery.

Main Methods:

  • Synthesis of a thio-ester pro-anticancer ether lipid.
  • Preparation and characterization of liposomes using the novel lipid.
  • Assessment of sPLA(2) hydrolysis rates and cytotoxicity of the liposomes.
  • Application of molecular dynamics (MD) simulations and density functional theory (DFT) to elucidate the hydrolysis mechanism.

Main Results:

  • Liposomes formulated with the thio-ester lipid exhibited an altered rate of hydrolysis by sPLA(2).
  • The synthesized thio-ester lipids maintained their cytotoxicity against cancer cells upon sPLA(2) exposure.
  • MD and DFT simulations revealed a distinct enzymatic hydrolysis pathway for thio-esters compared to free thio-esters.

Conclusions:

  • The novel thio-ester lipid offers a means to modulate sPLA(2)-catalyzed hydrolysis rates in liposomes.
  • This modification allows for optimization of drug release profiles in sPLA(2)-sensitive drug delivery systems.
  • Understanding the molecular mechanism of sPLA(2) action on thio-esters provides insights for designing next-generation drug delivery vehicles.

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