Abstract:
:We synthesized 5-substituted pyrrolo[2,3-d]pyrimidine antifolates (compounds 5-10) with one-to-six bridge carbons and a benozyl ring in the side chain as antitumor agents. Compound 8 with a 4-carbon bridge was the most active analogue and potently inhibited proliferation of folate receptor (FR) α-expressing Chinese hamster ovary and KB human tumor cells. Growth inhibition was reversed completely or in part by excess folic acid, indicating that FRα is involved in cellular uptake, and resulted in S-phase accumulation and apoptosis. Antiproliferative effects of compound 8 toward KB cells were protected by excess adenosine but not thymidine, establishing de novo purine nucleotide biosynthesis as the targeted pathway. However, 5-aminoimidazole-4-carboxamide (AICA) protection was incomplete, suggesting inhibition of both AICA ribonucleotide formyltransferase (AICARFTase) and glycinamide ribonucleotide formyltransferase (GARFTase). Inhibition of GARFTase and AICARFTase by compound 8 was confirmed by cellular metabolic assays and resulted in ATP pool depletion. To our knowledge, this is the first example of an antifolate that acts as a dual inhibitor of GARFTase and AICARFTase as its principal mechanism of action.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Mitchell-Ryan S,Wang Y,Raghavan S,Ravindra MP,Hales E,Orr S,Cherian C,Hou Z,Matherly LH,Gangjee Adoi
10.1021/jm401328usubject
Has Abstractpub_date
2013-12-27 00:00:00pages
10016-10032issue
24eissn
0022-2623issn
1520-4804journal_volume
56pub_type
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