Synthesis of Androst-5-en-7-ones and Androsta-3,5-dien-7-ones and Their Related 7-Deoxy Analogs as Conformational and Catalytic Probes for the Active Site of Aromatase
摘要:
A series of androst-5-en-7-ones and androsta-3,5-dien-7-ones and their 7-deoxy derivatives, respectively, were synthesized and tested for their abilities to inhibit aromatase in human placental microsomes. All the steroids inhibited the enzyme in a competitive manner with K-i's ranging from 0.058 to 45 mu M. The inhibitory activities of 17-oxo compounds were much more potent than those of the corresponding 17 beta-alcohols in each series. Steroids having an oxygen function (hydroxy or carbonyl) at C-19 were less potent inhibitors than the corresponding parent compounds having a 19-methyl group. 3,5-Dien-7-one 24 and its 19-hydroxy and 19-oxo derivatives (12 and 13) as well as 19-oxo-5-en-7-one 3 caused a time-dependent inactivation of aromatase only in the presence of NADPH in which the k(inact) values of 19-als 3 and 13 (0.143 and 0.189 min(-1), respectively) were larger than those of the corresponding 19-methyl (23 and 24) and 19-hydroxy (1 and 12) steroids, respectively. 19-Nor-5-en-7-one 4 but not its 3,5-diene derivative 14 also inactivated the enzyme in a time-dependent manner. In contrast, 7-deoxy steroids 21 and 27, having a 19-methyl group, did not cause it. The inactivations were prevented by the substrate androstenedione, and no significant effects of L-cysteine on the inactivations were observed in each case. The results suggest that oxygenation at C-19 would be at least in part involved in the inactivations caused by the inhibitors 23 and 24. The conjugated enone structures should play a critical role in the inactivation sequences.
Compounds of the formulae: ##STR1## are useful as anti-cancer, anti-obesity, anti-diabetic, anti-coronary agents, anti-aging agents, anti-hypolipidemic agents and anti-autoimmune agents.
Steroids useful as anti-cancer and anti-obesity agents, a therapeutic composition containing them and use thereof for the preparation of a therapeutic composition
申请人:RESEARCH CORPORATION TECHNOLOGIES, INC.
公开号:EP0246650B1
公开(公告)日:1992-01-02
Use of androsterone derivatives for inhibiting DNA binding of ap-1 and airway smooth muscle proliferation
申请人:CHARLOTTE-MECKLENBURG HOSPITAL doing business as Carolinas Medical Center
公开号:EP0934745B1
公开(公告)日:2004-04-28
System of interdependent anticancer antisense oligonucleotides targeting mRNAs the targets of which are NADPH-dependent, combined with one or more inhibitors of the Pentose Phosphate Pathway to deplete NADPH
申请人:Nyce Jonathan Wesley
公开号:US20170009238A1
公开(公告)日:2017-01-12
It is becoming increasingly clear that the genome and epigenome of another particular cancer cell represents the end product of a vast array of selection events, creating an extremely heterogeneous metabolic landscape. Since genomic and epigenomic variability exists between different cells in a tumor, the target complexity becomes even more extreme when the entire cancer cell population is considered. The only way to overcome this target complexity is by developing complex treatment modalities capable of simultaneously interdicting multiple pathways critical to the growth and survival of the cancer cell population. We have developed a method to couple suppression of NADPH levels (by inhibition of the Pentose Phosphate Pathway) with a system of antisense oligonucleotides targeting NADPH-dependent enzymes critical to the cancer cell. In the preferred embodiment of this invention, the PPP inhibitor is administered systemically, and the antisense oligonucleotides locally, directly to the tumor.