Tunable CD44-specific cellular retargeting with hyaluronic acid nanoshells

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Therapeutics

Background:

• Hyaluronic acid (HA) is a crucial component in the extracellular matrix.
• HA plays a role in cell adhesion and signaling, particularly through the CD44 receptor.
• Developing nanoparticles with both stealth and targeting capabilities is essential for effective drug delivery.

Purpose of the Study:

• To investigate the influence of hyaluronic acid (HA) molecular weight (Mw) on nanoparticle stealth and targeting properties.
• To tune nanoparticle retargeting to CD44-expressing cancer cells using HA nanoshells of varying Mw.
• To understand the combinatorial effects of HA Mw on stealth and CD44-mediated targeting.

Main Methods:

• Covalent grafting of different Mw HA onto polystyrene nanoparticles.
• Surface characterization using X-ray photoelectron spectroscopy to assess coating effectiveness.
• Evaluation of CD44-mediated retargeting and cellular internalization via flow cytometry and confocal microscopy in CD44-deficient and CD44-expressing cells.

Main Results:

• Effective surface coating with 33, 260, and 900 kDa HA was confirmed, enhancing colloidal stability and surface charge.
• All HA nanoshells demonstrated reduced non-specific interaction with CD44-negative cells.
• CD44-dependent cellular retargeting and internalization in CD44-positive cells were significantly influenced by the HA Mw.

Conclusions:

• Hyaluronic acid (HA) exhibits a dual capacity for stealth and CD44-mediated targeting.
• The molecular weight of HA is a critical tunable parameter for optimizing nanoparticle interactions.
• This study provides direct evidence for HA's tunable properties in nanoparticle design for cancer therapy.