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Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Ionizable amino lipid interactions with POPC: implications for lipid nanoparticle function.

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Ionizable cationic lipids in lipid nanoparticles (LNPs) for siRNA delivery can segregate internally, potentially hindering siRNA release into the cytoplasm. This LNP structural behavior may explain low therapeutic efficacy in liver disease treatments.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Lipid nanoparticles (LNPs) are crucial for siRNA delivery in liver diseases, but suffer from low cytoplasmic release.
  • Ionizable cationic lipids are key to LNP function, yet their internal distribution and role in siRNA release are poorly understood.
  • Previous work suggested DLin-KC2-DMA (KC2) forms an oil droplet core within LNPs.

Purpose of the Study:

  • To investigate the segregation behavior of the ionizable lipid KC2 within lipid nanoparticle (LNP) structures.
  • To provide evidence supporting the proposed model of KC2 forming an amorphous core in LNPs.
  • To explore the implications of KC2 confinement on siRNA release efficacy.

Main Methods:

  • Molecular dynamics simulations
  • Deuterium Nuclear Magnetic Resonance (NMR) spectroscopy
  • Small-Angle X-ray Scattering (SAXS)
  • Cryo-Transmission Electron Microscopy (cryo-TEM)

Main Results:

  • Neutral KC2 exhibits a strong tendency to segregate from POPC (1-palmitoyl-2-oleoyl-glycero-3-phosphocholine).
  • KC2 confinement within LNPs, influenced by pH during formulation, can alter internal LNP structure.
  • This internal segregation and confinement of KC2 may impede essential interactions for siRNA release.

Conclusions:

  • The findings support the model of KC2 forming a segregated core within LNPs.
  • KC2 confinement is a likely contributor to the limited siRNA release efficiency observed in LNP-based therapies.
  • Understanding LNP internal structure is critical for optimizing siRNA delivery systems.