6 thioguanine

6-Thioguanine (2-Amino-6-purinethiol) is an antineoplastic compound which also has antimetabolite action. The drug is used in the therapy of acute leukemia.

TH1760 (MKB) is an inhibitor of NUDIX-type 15 (NUDT15, IC50= 25 nM). TH1760 can sensitize cells to 6-thioguanine by increasing the accumulation of 6-thio- (d) GTP in nucleic acids. TH1760 can enhance the anti-leukemia effect of thiopurine.

CI-898 HCl is a lipophilic antifolate inhibitor of dihydrofolate reductase (DHFR). It has enhanced binding to DHFR in the presence of the cofactor NADPH. Cl-898 HCl inhibits cell growth and halts the cell cycle at the G1/S phase in L1210 mouse lymphocytic leukemia cells and is active against methotrexate-resistant cancer cell lines. It also enhances the activity of doxorubicin, cyclophosphamide, and 6-thioguanine (6-TG) in mice with advanced stage P338 leukemia.