Dynamic Multicomponent Reactions-Directed Self-Assembled G-quadruplex Inherent Antibacterial Hydrogel

Abstract

Nowadays, inherent antibacterial hydrogels have gained significant attention due to their utilization against infectious bacteria. Herein, we focus on the development of an injectable, self-healable, dynamic, and G-quadruplex hydrogel with inherent antibacterial activity. The dynamic self-assembled hydrogel is constructed upon multicomponent reactions (MCR) among guanosine, 2-formylphenylboronic acid, and amino acid/peptides in the presence of potassium ions. The role of amino acid/peptides in the formation of the G-quadruplex hydrogel is studied in detail. The G-quadruplex structure is formed via the π−π stacking of Gquartets. The formation of G-quadruplex is investigated by thioflavin T binding assay, CD spectroscopy, and PXRD. The formation of the dynamic imino-boronate bond in the hydrogels is well characterized by temperature-dependent 11 B NMR (VT-NMR) and FT-IR spectroscopy. Furthermore, HR-TEM images and rheological experiments reveal the fibrillar networks and viscoelastic property of the hydrogels. The presence of the dynamic iminoboronate ester bonds makes the hydrogel injectable and self-healable in nature. These dynamic G-quadruplex hydrogels show potential antibacterial activity against a series of Gram-positive and Gram-negative bacteria. The hydrogels have been used for the entrapment and sustained release of an anticancer drug doxorubicin over 48 h at different pHs (4.8, 7.4, and 8.5) and temperature without the influence of any external stimuli. Such injectable and self-healable hydrogels could be used in various applications in the field of biomedical science.

Turning Polysaccharides into Injectable and Rapid Self-Healing Antibacterial Hydrogels for Antibacterial Treatment and Bacterial-Infected Wound Healing

“…In recent years, a variety of wound dressings have been developed for treating wounds and promoting wound healing. Many functional wound dressings including electrospun nanofibers, biocompatible membranes, porous foams, and hydrogels − have shown excellent antibacterial activities and healing-promoting abilities on bacterial-infected wounds. Among them, hydrogels with three-dimensional network porous structure, superior biocompatibility, and extracellular matrix-like microenvironment have attracted much attention and have been favored by many researchers. − Hydrogels possess significant advantages in absorbing large amounts of tissue exudates, moisturizing and cooling wounds, relieving pain, and promoting wound healing. − Moreover, hydrogels with antibacterial and bactericidal properties and injectable and self-healing capabilities are more suitable for the treatment of infected wounds because these types of hydrogels can not only promptly remove bacteria from infected wounds, eliminate wound inflammation, and reduce dressing change frequency, but they are also suitable for treatment of irregular wounds, promote and accelerate the healing of infected wounds, and have therefore been highly favored .…”

Near-Infrared-Induced NO-Releasing Photothermal Adhesive Hydrogel with Enhanced Antibacterial Properties

“…To prevent secondary infection, various wound dressings such as foams, nanofibers, and hydrogels are used after trauma. – Because of their restorability, biocompatibility, and resemblance to the extracellular matrix, hydrogels are the perfect dressing for the treatment of wound healing. – Further, the water-swollen 3D polymer networks of hydrogels bestow the ideal environment for the suspension of nanoparticles . Das et al, have developed multicomponent reaction-directed nucleopeptide-coupled bioconjugated guanosine hydrogels which possess inherent antibacterial activity against both Gram-positive and Gram-negative bacteria. , Recent studies showed that an adhesive polymeric hydrogel could block the discharge of fluid and gas from the affected wound area, accelerating wound healing and preventing bacterial infections. Hydrogels blended with NO can be utilized for the treatment of wound healing, myocardial infection, and cancer. – However, research exploring the application of an adhesive hydrogel and NO donor is very limited.…”

Meta-Isobutoxy Phenylboronic Acid for Nanoscale Multi-Stimuli-Responsive Low-Molecular-Weight Hydrogelator

“…Combining the functionality of phenylboronic acids and amphiphilic copolymers extends their use as nanoscale drug delivery systems. ,, However, studies on the toxicity and biocompatibility of PBA-based compounds have reported varying results. Therefore, the cytotoxicity and cell viability of these nanomaterials must be thoroughly evaluated before considering their practical applications in biomedical contexts. – …”