Injectable Hydrogels Prepared Using Novel Synthetic Short Peptides with Defined Structure and Gelatin as Scaffolds to...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cancer Research

Background:

• Animal-derived matrices like Geltrex support cell and tissue growth but have undefined compositions and batch variability.
• This variability poses challenges for reproducible research, particularly in cancer studies involving tumor growth models.

Purpose of the Study:

• To develop a synthetic, well-defined hydrogel scaffold as an alternative to animal-derived matrices.
• To evaluate the efficacy of peptide/gelatin hybrid hydrogels in supporting cell and tissue growth, including tumor growth, in vitro and in vivo.

Main Methods:

• Designed synthetic short peptides with specific hydrophobic/hydrophilic sequences.
• Formed hybrid hydrogels by combining peptides (e.g., IEVEIRVK/IVK8) with gelatin.
• Assessed hydrogel injectability, degradability, and support for tumor spheroid growth (SW480, HepG2) in vitro.
• Evaluated tumor growth in a xenograft mouse model using peptide/gelatin hydrogels.

Main Results:

• Peptide/gelatin hybrid hydrogels are injectable and enzymatically degradable.
• Optimal hydrogel compositions supported tumor spheroid growth in vitro as effectively as Geltrex.
• Peptide/gelatin hydrogels successfully supported tumor growth in a human colorectal adenocarcinoma xenograft mouse model.

Conclusions:

• Synthetic peptide/gelatin hybrid hydrogels provide a promising, well-defined scaffold for cell and tissue growth.
• These hydrogels represent a viable alternative to animal-derived matrices in research applications, including cancer studies.
• The findings highlight the potential of self-assembling peptide hydrogels for regenerative medicine and in vivo research.