Dual-functional conjugates improving cancer immunochemotherapy by inhibiting tubulin polymerization and indoleamine-2,3-dioxygenase
摘要:
A series of novel conjugates comprising tublin and IDO inhibitors were designed, synthesized and evaluated for their antiproliferative activity. Among them, HI5, composed of combretastatin A-4 (CA-4) and (D)-1-methyltryptophan (D -MT) by a linker, exhibited the most potent antitumor activity, in particular with higher IC50 value (0.07 mu M) than CA-4 (0.21 mu M) against HeLa cancer cell line. Mechanism studies indicated that HIS can inhibit tubulin polymerization and cell migration, cause G2/M phase arrest, concurrent induce apoptosis via the mitochondrial dependent apoptosis pathway and cause reactive oxidative stress generation in HeLa cells. Furthermore, HIS can inhibit IDO expression and decrease kynurenine production, leading to stimulating T cells activation and proliferation to enhance antitumor immunity in vitro. Interestingly, HIS can effectively limit the tumor growth in the HeLa xenograft mice models without causing significant loss of body weight. Consequently, such a conjugation can be a potent and safe immunochemotherapeutic method for improving cancer therapy. (C) 2020 Elsevier Masson SAS. All rights reserved.
Catalytic Staudinger Reduction at Room Temperature
作者:Danny C. Lenstra、Joris J. Wolf、Jasmin Mecinović
DOI:10.1021/acs.joc.9b00831
日期:2019.5.17
catalytic Staudingerreduction at room temperature that enables the preparation of a structurally diverse set of amines from azides in excellent yields. The reaction is based on the use of catalytic amounts of triphenylphosphine as a phosphine source and diphenyldisiloxane as a reducing agent. Our catalytic Staudingerreduction exhibits a high chemoselectivity, as exemplified by reduction of azides
Efficient Access to New Chemical Space Through Flow-Construction of Druglike Macrocycles Through Copper-Surface-Catalyzed Azide-Alkyne Cycloaddition Reactions
作者:Andrew R. Bogdan、Keith James
DOI:10.1002/chem.201002215
日期:2010.12.27
of 12‐ to 22‐membered macrocycles, with druglike functionality and properties, have been generated by using a simple and efficient copper‐catalyzed azide–acetylene cycloadditionreaction, conducted in flow in high‐temperature copper tubing, under environmentally friendly conditions. The triazole‐containing macrocycles have been generated in up to 90 % yield in a 5 min reaction, without resorting to
Conjugated growth hormones of the structure (I) are provided together with methods for manufacturing said conjugates. The conjugates are useful in therapy.
A novel complexity-to-diversity strategy for the diversity-oriented synthesis of structurally diverse and complex macrocycles from quinine
作者:J.J. Ciardiello、H.L. Stewart、H.F. Sore、W.R.J.D. Galloway、D.R. Spring
DOI:10.1016/j.bmc.2017.02.060
日期:2017.6
to the lack of structural (particularly scaffold) diversity and structural complexity exhibited by current small molecule screening collections. Macrocycles have been shown to exhibit a diverse range of biological properties, with over 100 natural product-derived examples currently marketed as FDA-approved drugs. Despite this, synthetic macrocycles are widely considered to be a poorly explored structural