Engineering an Extracellular Matrix Mimic Using Hemoglobin Protein Nanofibrils

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Science

Background:

• Extracellular matrix (ECM) is vital for tissue development and cellular microenvironments.
• Advanced tissue engineering requires effective ECM mimics.
• Polycaprolactone (PCL), a synthetic polymer, is widely used but has limited biocompatibility due to its inactive surface.

Purpose of the Study:

• To enhance the biocompatibility of PCL for tissue engineering applications.
• To create a novel ECM mimic by incorporating hemoglobin nanofibrils (HbFs) into PCL.
• To improve cell interaction with PCL-based scaffolds.

Main Methods:

• Hemoglobin nanofibrils (HbFs) were synthesized from bovine hemoglobin.
• HbFs were incorporated into PCL using an electrospinning technique to create HbFs@PCL scaffolds.
• Fibroblast adherence, proliferation, and infiltration were evaluated on both HbFs@PCL and pure PCL scaffolds.

Main Results:

• The HbFs@PCL electrospun scaffolds demonstrated significantly improved fibroblast adherence and proliferation compared to pure PCL scaffolds.
• Enhanced fibroblast infiltration into the depth of the HbFs@PCL scaffold was observed.
• The results indicate that HbFs successfully improved the biological activity of the PCL surface.

Conclusions:

• The incorporation of HbFs into PCL via electrospinning is a viable strategy to create biocompatible ECM mimics.
• HbFs@PCL scaffolds show significant potential for tissue engineering applications requiring improved cell integration.
• This study pioneers the use of Hb-sourced nanofibrils in electrospun PCL scaffolds for regenerative medicine.