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Phospholipid Bilayer Properties in pH-Responsive Hemoglobin-Based Oxygen Carriers.

John M Sansalone1,2, Parikshit Moitra3, Allan Doctor4

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This study introduces a novel hemoglobin-based oxygen carrier (HBOC) membrane with a pH-sensitive molecule (KC1003). The HBOC membrane demonstrates mechanical stability, efficient gas diffusion, and pH-responsive 2,3-DPG binding, mimicking red blood cells.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biophysics

Background:

  • Hemoglobin-based oxygen carriers (HBOCs) are crucial for addressing blood supply shortages.
  • Polyethylene glycol surface-conjugated liposome-encapsulated hemoglobin (PEG-LEH) shows promise in mimicking red blood cell function.
  • Developing HBOCs with tunable oxygen transport properties is essential.

Purpose of the Study:

  • To investigate the mechanical, gas-exchange, and pH-responsive properties of a novel HBOC membrane incorporating a pH-sensitive molecule (KC1003).
  • To assess the stability and functionality of the KC1003-modified phospholipid membrane at a molecular level.
  • To evaluate the potential of this HBOC for mimicking physiological oxygen uptake and release.

Main Methods:

  • Atomistic simulations were employed to analyze the phospholipid membrane structure and mechanical properties.
  • Gas diffusion rates through the membrane were calculated and compared to red blood cells.
  • The pH-dependent binding and release of 2,3-Diphosphoglyceric Acid (2,3-DPG) were investigated.

Main Results:

  • The KC1003-containing phospholipid membrane exhibited mechanical stability under physiological conditions.
  • Increased KC1003 concentration led to minor increases in lipid disorder but did not impede gas diffusion.
  • Gas diffusion values were comparable to those of native red blood cells.
  • The membrane demonstrated pH responsiveness, binding 2,3-DPG at high pH and releasing it at low pH.

Conclusions:

  • The novel HBOC membrane is mechanically stable and facilitates efficient gas diffusion.
  • The membrane's pH sensitivity, modulated by KC1003 concentration, allows for tunable oxygen binding and release.
  • These findings support the use of KC1003-modified membranes for developing advanced HBOCs that effectively mimic red blood cell oxygen transport.