1431-39-6Relevant articles and documents
NIR light controlled release of caged hydrogen sulfide based on upconversion nanoparticles
Chen, Wansong,Chen, Min,Zang, Qiguang,Wang, Liqiang,Tang, Feiying,Han, Yajing,Yang, Cejun,Deng, Liu,Liu, You-Nian
, p. 9193 - 9196 (2015)
A NIR light induced H2S release platform based on UCNPs was constructed. Under NIR light excitation, UCNPs can emit UV light which triggers H2S release in a spatial and temporal pattern. The platform was also employed to real-time monitor the delivery process in vivo, which may provide a new way for the use of H2S-based therapeutics for a variety of diseases. This journal is
Dual Roles of Protein as a Template and a Sulfur Provider: A General Approach to Metal Sulfides for Efficient Photothermal Therapy of Cancer
Sheng, Jianping,Wang, Liqiang,Han, Yajing,Chen, Wansong,Liu, Hong,Zhang, Min,Deng, Liu,Liu, You-Nian
, (2018)
Fabrication of clinically translatable nanoparticles (NPs) as photothermal therapy (PTT) agents against cancer is becoming increasingly desirable, but still challenging, especially in facile and controllable synthesis of biocompatible NPs with high photothermal efficiency. A new strategy which uses protein as both a template and a sulfur provider is proposed for facile, cost-effective, and large-scale construction of biocompatible metal sulfide NPs with controlled structure and high photothermal efficiency. Upon mixing proteins and metal ions under alkaline conditions, the metal ions can be rapidly coordinated via a biuret-reaction like process. In the presence of alkali, the inert disulfide bonds of S-rich proteins can be activated to react with metal ions and generate metal sulfide NPs under gentle conditions. As a template, the protein can confine and regulate the nucleation and growth of the metal sulfide NPs within the protein formed cavities. Thus, the obtained metal sulfides such as Ag2S, Bi2S3, CdS, and CuS NPs are all with small size and coated with proteins, affording them biocompatible surfaces. As a model material, CuS NPs are evaluated as a PTT agent for cancer treatment. They exhibit high photothermal efficiency, high stability, water solubility, and good biocompatibility, making them an excellent PTT agent against tumors. This work paves a new avenue toward the synthesis of structure-controlled and biocompatible metal sulfide NPs, which can find wide applications in biomedical fields.
Protection of human retinal pigment epithelial cells from oxidative damage using cysteine prodrugs
Bulumulla, Chandima,Catchpole, Timothy,Christie, Abigail,Csaky, Karl G.,Kularatne, Ruvanthi N.,Stefan, Mihaela C.,Takacs, Alison
, p. 386 - 394 (2020)
Age-related macular degeneration (AMD) is one of the major causes of vision loss in the elderly in most developed countries. Among other causes, oxidative stress in the retinal pigment epithelium (RPE) has been hypothesized to be a major driving force of AMD pathology. Oxidative stress could be treated by antioxidant administration into the RPE cells. However, to achieve high in-vivo efficacy of an antioxidant, it is imperative that the agent be able to penetrate the tissues and cells. Evidence suggests that lipophilicity governs cellular penetrance. Out of many antioxidant candidates, N-acetyl-L-cysteine (a prodrug of L-cysteine) (NAC) is a potent antioxidant as the bioavailability of the parent drug, L-cysteine, determines the production of glutathione; the universal antioxidant that regulates ROS. To increase the lipophilicity, four ester derivatives of N-acetylcysteine: N-acetylcysteine methyl ester, N-acetylcysteine ethyl ester, N-acetylcysteine propyl ester, and N-acetylcysteine butyl ester were synthesized. To mimic in vitro AMD conditions, hydroquinone, a component of cigarette smoke, was used as the oxidative insult. Cytosolic and mitochondrial protection against oxidative stress were tested using cytosolic and mitochondrial specific assays. The results provide evidence that these lipophilic cysteine prodrugs provide increased protection against oxidative stress in human RPE cells compared with NAC.
Unlocking Amides through Selective C–N Bond Cleavage: Allyl Bromide-Mediated Divergent Synthesis of Nitrogen-Containing Functional Groups
Govindan, Karthick,Chen, Nian-Qi,Chuang, Yu-Wei,Lin, Wei-Yu
, p. 9419 - 9424 (2021/11/30)
We report a new set of reactions based on the unlocking of amides through simple treatment with allyl bromide, creating a common platform for accessing a diverse range of nitrogen-containing functional groups such as primary amides, sulfonamides, primary amines, N-acyl compounds (esters, thioesters, amides), and N-sulfonyl esters. The method has potential industrial applicability, as demonstrated through gram-scale syntheses in batch and in a continuous flow system.
Fluorogenic iminosydnones: Bioorthogonal tools for double turn-on click-and-release reactions
Audisio, Davide,Porte, Karine,Riomet, Margaux,Taran, Frédéric,Wijkhuisen, Anne
, p. 7183 - 7186 (2020/07/14)
In this article, we report the synthesis and use of iminosydnone-based profluorophores as bioorthogonal cleavable linkers for imaging applications. These linkers react with cycloalkynes via subsequent [3+2] cycloaddition and retro Diels-Alder reactions, allowing simultaneous release of two dyes in biological media. This journal is