Thiomyristoyl

Thiomyristoyl is a potent and specific SIRT2 inhibitor with an IC50 of 28 nM.

Signaling Pathways >> Cell Cycle/DNA Damage >> Sirtuin

Signaling Pathways >> Epigenetics >> Sirtuin

Research Areas >> Cancer

SIRT2:28 nM (IC50)

SIRT1:98 μM (IC50)

Thiomyristoyl (TM) is a potent SIRT2-specific inhibitor with broad anticancer activity but little effect on non-cancerous cells. SIRT2-inhibition promotes c-Myc ubiquitination and degradation, suggesting the therapeutic potential of TM to target certain c-Myc-driven cancers. TM could inhibit SIRT2 with an IC50 of 28 nM, but inhibits SIRT1 with an IC50 value of 98 μM and does not inhibit SIRT3 even at 200 μM. TM inhibits three human breast cancer cell lines, MCF-7, MDA-MB-468, and MDA-MB-231[1].

TM inhibits tumor growth in mouse models of breast cancer. TM does not cause significant toxicity in mice and no significant weight loss is observed in TM-treated mice. S5H, the acetyl-a-tubulin level is moderately but statistically significantly increased in tumors from TM-treated mice compared with those from vehicle-treated mice, suggesting that TM indeed inhibits SIRT2 in vivo[1].

Cells are seeded into 96-well plates at 3,000–4,000 cells per well. After 24 hr, test compounds (Thiomyristoyl) are added to cells to final concentrations ranging from 1 to 50 μM. Cells are then incubated for 72 hr and cell viability is measured using the CellTiter-Blue viability assay. Relative cell viability in the presence of test compounds is normalized to the vehicle-treated controls after background subtraction. GraphPad Prism software is used to determine the IC50 values. Knockdown of SIRT1-7 in various cell lines is achieved by lentiviral infection[1].

[1]. Jing H, et al. A SIRT2-Selective Inhibitor Promotes c-Myc Oncoprotein Degradation and Exhibits Broad Anticancer Activity. Cancer Cell. 2016 Mar 14;29(3):297-310.

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