Preparation method of quick dissociative type thermosensitive hyaluronic acid hydrogel

Abstract

The invention discloses a preparation method of quick dissociative type thermosensitive hyaluronic acid hydrogel, and belongs to the field of biomedical materials. The hyaluronic acid hydrogel is prepared through a carbodiimide cross-linking reaction based on biodegradable hyaluronic acid with excellent biocompatibility as a raw material and poly(N-isopropylacrylamide) containing disulfide bonds and amino radicals at both ends as a cross-linking agent. The hydrogel not only has the characteristic of being dissociated and converted from solid phase hydrogel to an aqueous liquor, but also the rigidity of the hydrogel can be agilely adjusted and controlled by changing temperature and degree of crosslinking and the like. The hyaluronic acid hydrogel prepared by the method provided by the invention has the advantages of available raw materials, mild reaction condition, quick dissociation, thermosensitivity, adjustable rigidity and the like, and has a potential use to three-dimensional culture, in particular to effective segregation of cell-hydrogel after culture and discuss of influence rule of cell growth by mechanical signals.

Description

technical field [0001] The invention belongs to the field of biomedical materials, and in particular relates to a preparation method of a rapidly dissociable thermosensitive hyaluronic acid hydrogel suitable for three-dimensional cell culture. Background technique [0002] More and more studies have shown that the growth behavior, protein expression, and cell function of cells cultured in two-dimensional monolayers based on culture plates cannot objectively reflect the real situation of cells in vivo. Scholars believe that this is due to the difference between the two-dimensional culture environment and the three-dimensional microenvironment of cells in vivo. The former ignores the influence of cell-cell and cell-matrix interactions on cell growth. Therefore, in recent years, three-dimensional cell culture technology has received extensive attention and developed rapidly. Compared with cells cultured in 2D, cells cultured in 3D are more physiologically meaningful in terms o...

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Problems solved by technology

For example, hyaluronic acid grafted with poly(N-isopropylacrylamide) can form a hydrogel at body temperature, which has certain mechanical strength [HP Tan, et al. Thermosensitive injectable hyaluronic acid hydrogel foradipose tissue engineering. Biomaterials, 2009 ,30:6844-6853], but this strength is due to the temperature sensitivity of poly(N-isopropylacrylamide), resulting in unsatisfactory hydrogel uniformity, stability and persistence

However, the hyaluronic acid hydrogel prepared by the traditional chemical cross-linking method has good stability [J Yeom, et al.Effect of cross-linking reagents for hyaluronic acid hydrogel dermal fillers on tissue augmentation and regeneration. Bioconjugate Chem. 247], its mechanical properties can be adjusted in a wide range by controlling parameters such as the degree of cross-linking. Although it can be gradually degraded, it cannot meet the needs of rapid cell-matrix separation at the end of three-dimensional cell culture.

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