C2,N6-Disubstituted adenosines: synthesis and structure-activity relationships
作者:Bharat K. Trivedi、Robert F. Bruns
DOI:10.1021/jm00128a002
日期:1989.8
Extracellular adenosinereceptors have been divided into two major subtypes, called A1 and A2. Substitution of the adenosine molecule with appropriate groups at C2 or N6 is known to impart selectivity for the A2receptor over the A1 receptor. In the present study, we investigated whether substitution at both C2 and N6 would have additive effects on the A2/A1 affinity ratio, thereby providing compounds
A series of 70 triazine derivatives have been synthesized and tested for their capacity to modulate multidrug resistance (MDR) in DC-3F/AD and KB-A1 tumor cells in vitro, in comparison with verapamil (VRP), a calcium channel antagonist currently used in therapy as an antihypertensive drug, which also shows MDR modulating activity. Among the 12 selected compounds, 16 (S9788) showed high MDR reversing properties in vitro (300- and 6-fold VRP at 5-mu-M in DC-3F/AD and KB-A1 cells, respectively) and induced a strong accumulation of adriamycin. The relationship between the increase of ADR accumulation and the fold reversal induced by these compounds and their lack of effects on the sensitive DC-3F cells suggest that they act mainly by inhibiting the P-glycoprotein (Pgp) catalyzed efflux of cytotoxic agents, as already described for a majority of MDR modulators. In vivo, in association with the antitumor drug vincristine (0.25 mg/kg), 16 (100 mg/kg) increased the TIC by 39% in mice bearing the resistant tumor cell line P388/VCR. According to these interesting properties, 16 was selected for a clinical development because it was more bioavailable than 34, even though it was less active.
BRIDGES, ALEXANDER J., NUCLEOSIDES AND NUCLEOTIDES, 8,(1989) N, C. 357-366
作者:BRIDGES, ALEXANDER J.
DOI:——
日期:——
[EN] SELECTED N<6>-SUBSTITUTED ADENOSINES HAVING SELECTIVE A2 BINDING ACTIVITY
申请人:WARNER-LAMBERT COMPANY
公开号:WO1988003147A1
公开(公告)日:1988-05-05
(EN) Adenosines of formula (I), wherein Ar is (II), (III) or (IV), wherein A is oxygen or sulfur. The adenosines have highly selective A2 receptor binding activity and useful properties advantageous in treating cardiovascular diseases, such as hypertension, angina or myocardial ischemia, pain, insomnia and psychosis. Also a novel preparation of selected adenosines.(FR) Adénosines de formule (I) dans laquelle Ar représente (II), (III), ou (IV), A représentant l'oxygène ou le soufre. Les adénosines ont une activité de liaison de récepteur A2 très sélective et ont des propriétés utiles pour le traitement de maladies cardiovasculaires telles que l'hypertension, l'angine ou l'ischémie du myocarde, la douleur, l'insomnie et la psychose. Est également décrite une nouvelle préparation d'adénosines sélectionnées.