Design, synthesis of methotrexate-diosgenin conjugates and biological evaluation of their effect on methotrexate transport-resistant cells
摘要:
A series of methotrexate-diosgenin conjugates was designed and synthesized to enhance the passive internalization of methotrexate (MTX) into transport-resistant cells. The inhibitory effects of these conjugates on dihydrofolate reductase (DHFR), and their anti-proliferation behaviors against a transport resistant breast cancer cell line, MDA-MB-231, were investigated. All of the synthesized conjugates retained an ability to inhibit DHFR after the diosgenin substitution. The MTX conjugates were much more potent against methotrexate-resistant MDA-MB-231 cells than MTX. Conjugate 18, containing a disulfide bond, exhibited the most potent anti-proliferative and DHFR inhibitory effects (IC50 = 4.1 mu M and 17.21 nM, respectively). Anti-proliferative activity was higher in the conjugate with a longer space linker (conjugate 21) than those with shorter linkers (conjugates 19 and 20). These results suggest that diosgenin conjugation of MTX may be an effective way to overcome its transport resistance in cancer cells. (C) 2016 Elsevier Inc. All rights reserved.
The Reaction of Phthalic Anhydride with Diethylenetriamine and Triethylenetetramine. A Literature Correction
作者:Anatoli Onopchenko、James J. Harrison、Carrie Y. Chan
DOI:10.1246/bcsj.71.717
日期:1998.3
reported in the literature are attributed to branched and cyclic amines in their triethylenetetramine, and not to rearrangement reactions. Such possibility is supported by analysis of triethylenetetramine from the same supplier (ca. 65% linear), and our failure to duplicate the results with an authentic triethylenetetramine. Several reported compounds were prepared from pure ami...
Ganin, E.V.; Makarov, V.F.; Nikitin, V.I., Journal of Organic Chemistry USSR (English Translation), 1987, vol. 23, p. 330 - 332
作者:Ganin, E.V.、Makarov, V.F.、Nikitin, V.I.
DOI:——
日期:——
A Facile Approach to the Preparation of Bis-Crown Ethers Based on SET-Promoted Photomacrocyclization Reactions
作者:Nam Kyung Sung、Dae Won Cho、Jung Hei Choi、Kyung Wha Choi、Ung Chan Yoon、Hajime Maeda、Patrick S. Mariano
DOI:10.1021/jo701770x
日期:2007.11.1
[GRAPHICS]A novel methodology for the synthesis of bis-crown ethers has been developed. The preparative route takes advantage of an efficient single electron transfer promoted photomacrocyclization reaction of polyether branched bisphthalimides which contain a-trimethylsilylmethyl groups at terminal positions. The generality of the methodology was demonstrated by its application to the synthesis of symmetric and unsymmetric bis-crown ethers of various ring sizes. Finally, the metal cation binding and fluorescence emission properties of the bis-crowns, prepared by using the developed procedure, were briefly explored.
Reaction of phthalimide with diethylene triamine and triethylene tetramine