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Summary

Lysolipid-based thermosensitive liposomes (LTSLs) release drugs via a unique mechanism involving lipid melting and transient pores. This study clarifies the

Keywords:
DSCSAXSWAXSdifferential scanning calorimetryeutectic pointinterdigitated lamellar phaselysolecithinlysolipidphase diagrampressure perturbation calorimetrythermoresponsive liposomes

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Area of Science:

  • Drug Delivery Systems
  • Lipid Bilayer Research
  • Materials Science

Background:

  • Thermosensitive liposomes (LTSLs) are crucial for temperature-triggered drug delivery.
  • Understanding the 'lysolipid paradox' is key to optimizing LTSL function.
  • Current models do not fully explain lysolipid behavior in LTSLs.

Purpose of the Study:

  • To elucidate the molecular mechanisms of drug release from LTSLs.
  • To explain lysolipid's role in drug retention and release.
  • To investigate LTSL annealing and incomplete drug release.

Main Methods:

  • Differential scanning calorimetry
  • Pressure perturbation calorimetry
  • Small- and wide-angle X-ray scattering (SAXS/WAXS)

Main Results:

  • LTSLs with 10 mol% monostearyl lysophosphatidylcholine (MSPC) exist at a eutectic point near 41°C.
  • A gel phase with depleted MSPC and interdigitated MSPC-rich domains coexist below 41°C.
  • Melting at 41°C creates transient pores due to high local MSPC, enabling drug release.

Conclusions:

  • The 'lysolipid paradox' is explained by MSPC's safe storage in interdigitated domains.
  • Drug release is mediated by transient pores formed upon melting of MSPC-rich domains.
  • Membrane sealing occurs as MSPC redistributes, limiting total drug release.