一氧化氮 (NO) 作为许多生理过程的关键调节剂和有效的治疗剂。由于高浓度 NO 的毒性,NO 的局部递送对于实现目标治疗结果很重要。尽管光刺激代表了一种具有时空精度来介导 NO 释放的非侵入性工具,但许多光响应性 NO 释放分子只能对紫外线 (UV) 或近紫外线可见光做出反应,具有低渗透性和高光毒性。我们报告说,在钯(II)四苯基四苯并卟啉存在的情况下,在(深)红光(630 或 700 nm)照射下可以激活基于香豆素的 NO 供体,在 328 nm 处具有最大吸光度,从而实现化学计量和自我报告的 NO 释放通过光氧化还原催化的光解量子产率为 8%。铜绿假单胞菌体外生物膜和体内治疗皮肤脓肿。
Synthesis, Photophysical, Photochemical and Biological Properties of Caged GABA, 4-[[(2H-1-Benzopyran-2-one-7-amino-4-methoxy) carbonyl] amino] Butanoic Acid¶
摘要:
The photorelease of a caged neurotransmitter can be used to investigate the function of neuronal circuits in tissues. We have designed and synthesized a stable, caged gamma-aminobutyric acid (GABA) derivative, 4-[[(2H-1-benzopyran-2-one-7-amino-4-methoxy)carbonyl]amino] butanoic acid (BC204), that releases the neurotransmitter in physiological medium when irradiated with UV light at 300-400 mn in PBS at pH 7.4. The release of GABA occurs with the formation of the major photoproduct, 7-amino-4-(hydroxymethyl)-2H-1-benzopyran-2-one, via a solvolytic photodegradation mechanism of the coumarin moiety and was confirmed by electrospray mass spectrometry/mass spectrometry (ESI MS/MS). BC204 is chemically stable and shows no intrinsic activity after many hours under physiological dark conditions. These properties suggest that BC204 is an excellent form of caged GABA that is well suited for long-term biological studies.
Coumarin-based fluorescent sensors for zinc(II) and hypochlorite
作者:Margaret L. Aulsebrook、Bim Graham、Michael R. Grace、Kellie L. Tuck
DOI:10.1080/10610278.2015.1077958
日期:2015.12.2
One sensor features a di(2-picoyl)amine metal ion-binding moiety that allows for selectivedetection of Zn2+ ions over other common cations in aqueous solution, with the sensor exhibiting a 5.4-fold increase in fluorescence upon Zn2+ binding (limit of detection = 26 nM). The second sensorincorporates an aminophenyl group designed to react with highly reactive oxygen species (hROS). This sensor reacts