Classic Review,have been proven to be preeminent biomedical materials

Peptide hydrogels represent a cutting-edge class of biomaterials with remarkable potential across various scientific and medical fields. These intricate structures are formed by peptides, which are short chains of amino acids linked by peptide bonds. The unique ability of certain peptides to spontaneously organize into three-dimensional fibrous networks, mimicking the natural extracellular matrix (ECM), is the foundation of their utility. This self-assembly process, driven by non-covalent interactions such as hydrogen bonding and pi-pi stacking, results in self-assembly peptide hydrogels with exceptional properties.

The significance of peptide-based hydrogels lies in their inherent biocompatibility and biodegradability, coupled with their tunable mechanical stability and high water-retention capacity. These characteristics make them preeminent biomedical materials. The fabrication methods of peptide hydrogels are diverse, encompassing physical, chemical, and biological stimulation techniques, allowing for precise control over their structure and function. The hierarchical formation of self-assembling peptide-based hydrogels (SAPHs) typically begins with the assembly of individual peptides into nanofibers, which subsequently entangle to form the hydrogel matrix. This intricate process underpins their versatility.

One of the most compelling aspects of self-assembled peptide hydrogels is their ability to create an excellent biological environment for cell adhesion. Research indicates that peptide hydrogels can protect cells from deactivation and facilitate their nutrient transport, a crucial factor in regenerative medicine and tissue engineering. Furthermore, hydrogel-forming peptides are specially designed to organize into a hydrogel matrix, providing a stable and supportive scaffold for cellular growth and differentiation. This makes them highly attractive for applications in 3D stem cell cultures and regenerative medicine.

The applications of peptide hydrogels extend significantly into drug delivery systems. Multidomain peptides assemble into supramolecular hydrogels that can encapsulate and controllably release therapeutic agents. Supramolecular peptide-based hydrogels for drug delivery are being actively investigated for their potential to maintain safe and potent drug levels in vivo. The development of self-assembled hydrogel formulations shows particular promise for the treatment and management of various conditions, including chronic diseases.

Beyond drug delivery, peptide hydrogels are proving invaluable in other biomedical arenas. Their capacity to mimic the ECM makes them ideal for tissue engineering, aiming to repair or replace damaged tissues. Moreover, peptide-based hydrogels are emerging as powerful tools in biosensing and antitumor therapy, demonstrating their broad therapeutic potential. The easy synthesis, characterization, and decoration, biodegradability, and inherent biocompatibility of these materials further enhance their appeal.

The field is continuously evolving, with ongoing research exploring novel designs and functionalities. For instance, peptide-based supramolecular hydrogels are being engineered to exhibit specific responses to external stimuli, leading to the development of "smart" hydrogels. The versatility of peptide hydrogels is further highlighted by their application in creating various structures, such as micelles and vesicles, through diverse physical assembly processes.

In summary, peptide hydrogels are a transformative class of biomaterials characterized by their self-assembling nature, biocompatibility, and tunable properties. Their ability to mimic the natural ECM and provide a supportive environment for cells makes them indispensable for advancements in regenerative medicine, drug delivery, and tissue engineering. As research progresses, the full potential of these biomolecular hydrogels as promising scaffolds for biomedical applications is continually being realized.