PMID: 8589057Jan 1, 1995Paper

The stereospecific cytotoxic potency of (6R) and (6S)-5,10- dideazatetrahydrofolate correlates with cellular folylpolyglutamate synthetase levels

Biochimie
N L Lehman

Abstract

The de novo purine synthesis inhibitor 5,10-dideazatetrahydrofolate (DDATHF) has previously been shown to inhibit the growth of mouse L1210 and human CCRF-CEM leukemia cells. The present study demonstrates that both the 6R and 6S diastereomers of DDATHF are also cytotoxic to mammalian cells in a stereospecific manner. The cytotoxic potency of (6R)-DDATHF (also known as Lometrexol) towards different cell lines varied by approximately 14-fold and that of (6S)-DDATHF by as much as 156-fold. Compared to (6R)-DDATHF, (6S)-DDATHF was 6.0- and 7.2-fold more cytotoxic to human WiDr colon adenocarcinoma and Chinese hamster ovary (CHO) cells, respectively, and only 1.5- and 2.0-fold more cytotoxic to human T24 bladder carcinoma and mouse L1210 leukemia cells, respectively. However, compared to (6S)-DDATHF, (6R)-DDATHF was 8.7- and 6.9-fold more cytotoxic to C3H/10T1/2 clone 8 and clone 16 mouse fibroblasts, respectively. Weak inhibition of aminoimidazolecarboximide ribonucleotide formyltransferase (AICARFT, EC 2.1.2.3) appeared to have little role in the cytotoxicity of DDATHF diastereomers to WiDr cells during a 24-h exposure. Although glycinamide ribonucleotide formyltransferase (GARFT, EC 2.1.21) is the main biochemical target of DDAT...Continue Reading

Citations

Oct 13, 2011·ISRN Dentistry·Ranya Faraj Elemam, Iain Pretty
Jul 4, 2001·European Journal of Cancer : Official Journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)·D W MilesM J Lind

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