Intracellular effects of prodrug-like wortmannin probes
摘要:
Wortmannin, a known inhibitor of phosphoinositide 3-kinases (PI3Ks), their low selectivity and high toxicity is still problematic and less is known about their effects on PI3Ks in cellular systems. Hence, we have synthesized a series of multifunctional wortmannin probes with the ability to self-activate, by installing a clickable handle at C11 site, and secondary amine and cancer-targeting moiety at C20 site, respectively. MTT assay first confirmed that self-activating probes have better inhibition potency and biotin enhanced their cancer cell uptake. Further experiments showed most of probes can target P13K Akt/mTOR pathway with prolonged turn-over time. Protein profiling and pull-down results were observed that the derivatives not only labelled four PI3Ks with selectivity, but also engaged in covalent interactions with numerous cellular proteins which could be the major reason of their high toxicity. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Hydrogensulfide (H2S), a well-known signaling molecule, exerts significant regulatory effects on the cardiovascular and nervous systems. Therefore, monitoring the metabolism of H2S offers a potential mechanism to detect various diseases. In addition, biotin is significantly used as a targeting group to detect cancer cells exclusively. In this work, a biotin-guided benzoxadizole-based fluorescent probe
硫化氢(H 2 S)是一种众所周知的信号分子,对心血管和神经系统具有显着的调节作用。因此,监测H 2 S的代谢为检测各种疾病提供了潜在的机制。此外,生物素还被广泛用作专门检测癌细胞的靶向基团。在这项工作中,开发了一种生物素引导的基于苯并恶二唑的荧光探针 NP-生物素,用于 H 2 S 检测,并在正常肝细胞 (LO2) 和肝癌细胞 (HepG2) 系中进行评估。结果表明,NP-生物素可以高灵敏度和选择性地检测细胞H 2 S。而且,在生物素组的指导下,NP-生物素已被证实具有靶向癌细胞的能力。
Toward [<sup>18</sup>F]-Labeled Aryltrifluoroborate Radiotracers: In Vivo Positron Emission Tomography Imaging of Stable Aryltrifluoroborate Clearance in Mice
作者:Richard Ting、Curtis Harwig、Ulrich auf dem Keller、Siobhan McCormick、Pamela Austin、Christopher M. Overall、Michael J. Adam、Thomas J. Ruth、David M. Perrin
DOI:10.1021/ja802734t
日期:2008.9.10
The use of a boronic ester as a captor of aqueous [(18)F]-fluoride has been previously suggested as a means of labeling biomolecules in onestep for positron emission tomography (PET) imaging. For this approach to be seriously considered, the [(18)F]-labeled trifluoroborate should be humorally stable such that it neither leaches free [(18)F]-fluoride to the bone nor accumulates therein. Herein, we
Substituted aryl-boron compounds comprising at least one
18
F atom, as illustrated by the formula (I), where at least one of Y
1
or Y
2
is
18
F and A
1
is a substituted aromatic ring, with G
1-5
being, independently, C or N, and where the substitutents of the aromatic ring or polycyclic moiety (other than boron) comprise at least one electron-withdrawing group (EWG), providing that sigma total (σ
total
) for all substituents on the aromatic ring or polycyclic moiety except B is about 0.06 or more when said at least one EWG is positioned ortho to B, or about 0.2 or more when no EWG is positioned ortho to B. The compounds include neutral (N=1) and ionic borate (N=2) embodiments. The compounds are useful as positron emission tomography (PET) imaging agents.
An extension of the T2 linker methodology by showing its applicability as a photocleavable linker is reported. Photocleavage was carried out with 355 nm UV laser irradiation (3omega Nd-YAG) in methanol/diethyl ether and is suitable for protected amino acid derivatives, as well as simple small organic molecules including resin-bound biotin. The linker is stable under a wide range of conditions with the exception of strongly acidic media. (C) 2004 Elsevier Ltd. All rights reserved.