前体聚合物己二酸酰肼改性HA-ADH在水凝胶胶粘剂中的应用
瑞禧生物2024-12-18   作者:ZJ   来源:
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原文献:

Injectable, self-healing hydrogel adhesives with firm tissue adhesion and on-demand biodegradation for sutureless wound closure

文献链接:

https://www.science.org/doi/full/10.1126/sciadv.adh4327#supplementary-materials

作者:

Hui Ren, Zhen Zhang, Xueliang Cheng, Zheng Zou, Xuesi Chen, and Chaoliang He

原文摘要:

Tissue adhesives have garnered extensive interest as alternatives and supplements to sutures, whereas major challenges still remain, including weak tissue adhesion, inadequate biocompatibility, and uncontrolled biodegradation. Here, injectable and biocompatible hydrogel adhesives are developed via catalyst-free o-phthalaldehyde/amine (hydrazide) cross-linking reaction. The hydrogels demonstrate rapid and firm adhesion to various tissues, and an o-phthalaldehyde–mediated tissue adhesion mechanism is established. The hydrogel adhesives show controlled degradation profiles of 6 to 22 weeks in vivo through the incorporation of disulfide bonds into hydrogel network. In liver and blood vessel injury, the hydrogels effectively seal the incisions and rapidly stop bleeding. In rat and rabbit models of full-thickness skin incision, the hydrogel adhesives quickly close the incisions and accelerate wound healing, which exhibit efficacies superior to those of commercially available fibrin glue and cyanoacrylate glue. Thus, the hydrogel adhesives show great potential for sutureless wound closure, hemostasis sealing, and prevention of leakage in surgical applications.

 

 

组织胶粘剂作为缝合线的替代品和补充剂存在以下缺点:组织粘附力弱、生物相容性不足和不受控制的生物降解。通过HA-ADH参与的无催化剂的邻苯二甲醛/胺(酰肼)交联反应开发可注射和生物相容性水凝胶胶粘剂。水凝胶表现出对各种组织的快速而牢固的粘附,并建立了邻苯二甲醛介导的组织粘附机制。

水凝胶 

前体聚合物己二酸酰肼改性的 HA (HA-ADH)与4aPEG-OPA (表示为 HA-PEG) 水凝胶是通过在生理条件下在磷酸盐缓冲盐水 (PBS) 中以 1:1 的质量比简单地混合而形成的,无需任何催化剂的参与。4aPEG-OPA 的 OPA 基团与 HA-ADH 的酰肼基团之间的反应导致形成异吲哚双(半氨基)(IBHA) 杂环中间体,该中间体进一步脱水形成腙(图 A)。

聚合物前体溶液和所得水凝胶的良好生物相容性是生物医学应用的基本要求,包括组织粘合剂的开发。使用浓度范围为 0.0625 至 1 mg/ml 的细胞计数试剂盒 8 (CCK-8) 测定法评估前体聚合物 HA-ADH 和 4aPEG-OPA 对成纤维细胞 NIH 3T3 细胞的细胞相容性,持续 24 小时。如图 L 所示,细胞活力超过 90%,表明 HA-ADH 和 4aPEG-OPA 没有可检测到的细胞Poison 作用。通过将 HA-ADH 与 HA-DTPH 以相等质量比混合,得到的 HA-SS0.5-PEG 水凝胶在 14 周内大部分降解。

 

结论:用HA-ADH参与制备的 HA-SS-PEG 水凝胶表现出组织粘附性、良好的生物相容性和可控的生物降解性,因此有望作为无缝合伤口闭合的组织粘合剂。