Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
Department of Natural Products and Medicinal Chemistry, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad-500007, India.
J Mater Chem B. 2023 Jun 14;11(23):5131-5141. doi: 10.1039/d3tb00588g.
Hydrogen sulfide (HS) is an important gasotransmitter that plays a significant role in the regulation of various physiological activities. The therapeutic effect of HS is highly concentration-dependent and has recently been recognized for wound healing applications. Until now, the reported HS delivery systems for wound healing applications have been focused on polymer-coated cargo systems for the encapsulation of HS donors that are based just on endogenous stimuli-responsive systems such as pH or glutathione. These delivery systems lack spatio-temporal control and can cause premature HS release depending on the wound microenvironment. In this regard, polymer-coated light-activated gasotransmitter donors provide a promising and efficient means of delivering high spatial and temporal control along with localized delivery. Hence, for the first time, we developed a β-carboline photocage-based HS donor (BCS) and formulated it into two photo-controlled HS delivery systems: (i) Pluronic-coated nanoparticles loaded with BCS (Plu@BCS nano); and (ii) a hydrogel platform impregnated with BCS (Plu@BCS hydrogel). We investigated the mechanism of photo-release and the photo-regulated HS release profile from the BCS photocage. We found that the Plu@BCS nano and Plu@BCS hydrogel systems were stable and did not release HS without light treatment. Interestingly, external light manipulation, such as changing the irradiation wavelength, time, and location, regulate the release of HS precisely. Biological studies () suggest that the Pluronic coating on the BCS photocage makes the donor highly biocompatible and desirable for biological applications.
硫化氢(HS)是一种重要的气体递质,在调节各种生理活动中起着重要作用。HS 的治疗效果高度依赖于浓度,并已在伤口愈合应用中得到认可。到目前为止,用于伤口愈合应用的 HS 输送系统主要集中在聚合物涂层货物系统上,用于封装 HS 供体,这些供体仅基于内源性刺激响应系统,如 pH 值或谷胱甘肽。这些输送系统缺乏时空控制能力,并且根据伤口微环境可能会导致 HS 过早释放。在这方面,聚合物涂层的光激活气体递质供体提供了一种有前途和有效的方法,可以提供高时空控制以及局部输送。因此,我们首次开发了基于β-咔啉光笼的 HS 供体(BCS),并将其制成两种光控 HS 输送系统:(i)负载 BCS 的 Pluronic 涂层纳米颗粒(Plu@BCS 纳米);和(ii)负载 BCS 的水凝胶平台(Plu@BCS 水凝胶)。我们研究了光释放机制和 BCS 光笼的光调节 HS 释放特性。我们发现 Plu@BCS 纳米和 Plu@BCS 水凝胶系统在没有光处理的情况下是稳定的,不会释放 HS。有趣的是,外部光操纵,如改变照射波长、时间和位置,可以精确调节 HS 的释放。生物学研究表明,BCS 光笼上的 Pluronic 涂层使供体具有高度的生物相容性,适用于生物应用。