Human-based fibrillar nanocomposite hydrogels as bioinstructive matrices to tune stem cell behavior

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Platelet lysate (PL) gels mimic the extracellular matrix (ECM) but lack structural stability for regenerative applications.
• Improving the biomimetic properties and stability of PL gels is crucial for effective bioinstructive biomaterials.

Purpose of the Study:

• To enhance the structural stability and biomimetic properties of platelet lysate (PL) gels using cellulose nanocrystals (CNC).
• To develop injectable, human-based cell scaffolds with improved biomimicry for regenerative medicine.

Main Methods:

• Incorporation of rod-shaped cellulose nanocrystals (CNC) into the PL fibrillar network during gel formation.
• Characterization of changes in fiber branching, interfiber porosity, and mechanical properties of the resulting nanocomposite hydrogels.
• Evaluation of the effect of these modified hydrogels on human adipose-derived stem cell behavior and genetic phenotype commitment.

Main Results:

• CNC incorporation (0–0.61 wt%) decreased fiber branching and increased interfiber porosity (66% to 83%).
• Mechanical properties of the hydrogels were significantly modulated.
• Nanocomposite PL hydrogels exhibited reduced clot retraction (76% to 24% at day 7) and better retention of bioactive molecules.
• Encapsulated stem cells showed modulated differentiation toward specific genetic phenotypes without external biological stimuli.

Conclusions:

• Cellulose nanocrystals effectively stabilize platelet lysate hydrogels, creating robust, injectable scaffolds.
• These nanocomposite hydrogels serve as engineered ECMs that can direct stem cell fate for regenerative therapies.
• This approach offers a biomimetic strategy for triggering specific regenerative pathways in minimally invasive treatments.