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The Blood-brain Barrier00:49

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Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.

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Navigating the Endothelial Barrier: A Multiscale Framework for Precision Nanomedicine.

Hongxia Ma1, Lin Yang1, Chaofan Deng1

  • 1Institute of Coastal Environmental Pollution Control, Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, P. R. China.

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This review details how nanoparticle (NP) interactions with the vascular endothelium barrier influence drug delivery. Understanding these nanoscale-to-mesoscale events enables rational nanomedicine design for enhanced efficacy and safety.

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molecular mechanismnanoparticlesnan‐bio interactionsparacellular transporttranscellular transportvascular endothelial barrier

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Vascular Biology

Background:

  • The vascular endothelium acts as a critical barrier for systemic nanoparticle (NP) drug delivery.
  • Current understanding of NP translocation across endothelium is limited, especially regarding nanoscale interactions and mesoscale events.
  • Bridging the gap between molecular interactions and endothelial barrier dynamics is crucial for nanomedicine development.

Purpose of the Study:

  • To provide a mechanistic framework linking nanoscale NP properties to mesoscale endothelial transport.
  • To integrate insights from molecular interactions, junctional dynamics, and endothelial heterogeneity.
  • To guide the rational design of nanomedicines for improved therapeutic efficacy and safety.

Main Methods:

  • Analysis of multiscale vascular endothelium architecture and transport pathways (transcellular and paracellular).
  • Physicochemical property analysis of NPs influencing molecular recognition at the endothelium.
  • Utilizing molecular modeling and super-resolution imaging to identify predictive NP "nano-signatures".
  • Investigating NP-induced mechanical changes in VE-cadherin and actomyosin networks.

Main Results:

  • Identified NP "nano-signatures" that predict transport pathways across the endothelium.
  • Demonstrated how NPs reprogram endothelial junctions, influencing paracellular leakage.
  • Elucidated the role of NP transformations in modulating barrier penetration via interfacial interactions.
  • Synthesized multiscale data into a cohesive mechanistic framework.

Conclusions:

  • A mechanistic framework for NP-endothelial interactions was established.
  • This framework provides a blueprint for designing safer and more effective nanomedicines.
  • Understanding these interactions is key to enhancing therapeutic outcomes and minimizing adverse effects.