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KI1357Thioguanine500 mg$272
Thioguanine1 g$448

Chemical Characteristic

Product NameThioguanine
SynonymsTioguanine, 6-thioguanine
CAS No.154-42-7
Molecular Weight 167.19
FormulaC5H5N5S
Chemical Name2-?amino-?1,?9-?dihydro-6H-?purine-?6-?thione
Smilesc12c(c(nc(n1)N)S)nc[nH]2
Chemical Structure

Biological activities

Thioguanine is a purine antimetabolite widely used in the treatment of acute lymphoblasic leukemia, ulcerative colitis, and some autoimmune diseases. Thioguanine utilises the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRTase) to be converted to 6-thioguanine monophosphate (TGMP). High concentrations of TGMP may accumulate intracellularly and hamper the synthesis of guanine nucleotides via the enzyme Inosine monophosphate dehydrogenase (IMP dehydrogenase).[1] In the parental human ovarian cancer cell line 2008 and its DDP-resistant subline 2008/C 13×5.25, the IC50 value for 6-thioguanine is 6.5 and 3.7 µM, respectively.[2] In human CCRF-CEM cell lines that do and do not overexpress thiopurine S-methyl-transferase (TPMT), the IC50 value for thioguanine is 1.1 and 0.55 µM, respectively.[3] In mice bearing xenografts derived from BRCA2-deficient V-C8 cells, thioguanine (1.5 mg/kg) causes significant growth delay and three of five complete tumor regressions.[4]

Protocols

In vivo: 6-thioguanine is dissolved in PBS.[4]

References

[1] Dubinsky MC, et al. 6-thioguanine can cause serious liver injury in inflammatory bowel disease patients. Gastroenterology. 2003, 125(2): 298-303.
[2] Aebi S, et al. Loss of DNA mismatch repair in acquired resistance to cisplatin. Cancer Res. 1996, 56(13): 3087-3090.
[3] Dervieux T, et al. Differing contribution of thiopurine methyltransferase to mercaptopurine versus thioguanine effects in human leukemic cells. Cancer Res. 2001, 61(15): 5810-5816.
[4] Issaeva N, et al. 6-thioguanine selectively kills BRCA2-defective tumors and overcomes PARP inhibitor resistance. Cancer Res. 2010, 70(15): 6268-6276.

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