Hyaluronic Acid Matrices for In Situ Measurement of Protein Diffusion Coefficients

Area of Science:

• Biomaterials Science
• Pharmacokinetics
• Drug Delivery

Background:

• Protein-based therapeutics for subcutaneous (SQ) injection are a major class of biologics.
• In vitro assays simulating the SQ extracellular matrix (ECM) are crucial for understanding drug diffusion.
• Commercial hyaluronic acid (HA) sources exhibit lot-to-lot variability, hindering assay reproducibility.

Purpose of the Study:

• To develop a method for creating consistent in vitro HA matrices for protein diffusion studies.
• To address the challenge of lot-to-lot variability in commercial HA used in SQ diffusion models.
• To enable reliable and reproducible in vitro measurement of protein diffusion in simulated SQ environments.

Main Methods:

• Preparation of binary HA blends from distinct HA lots.
• Characterization of blended HA matrices using rheological and diffusion measurements.
• Comparison of protein diffusion across different HA matrix formulations.

Main Results:

• Binary HA blends demonstrated functional equivalence in protein diffusion compared to a reference matrix.
• The developed approach yielded consistent diffusion properties across different HA lots.
• Protocols enable the preparation of blended HA matrices with predictable diffusion characteristics.

Conclusions:

• Blending HA from different lots provides a robust strategy for creating consistent in vitro matrices.
• This method overcomes HA variability, facilitating reliable protein diffusion measurements for SQ drug development.
• The approach supports the formulation and optimization of subcutaneous protein therapeutics.