1. Cell Cycle/DNA Damage
  2. Nucleoside Antimetabolite/Analog
  3. Ethynylcytidine

Ethynylcytidine (Synonyms: ECyD; TAS-106; 3'-C-Ethynylcytidine)

Cat. No.: HY-16200 Purity: 99.52%
Handling Instructions

Ethynylcytidine is a new nucleoside antimetabolite.

For research use only. We do not sell to patients.

Ethynylcytidine Chemical Structure

Ethynylcytidine Chemical Structure

CAS No. : 180300-43-0

Size Price Stock Quantity
10 mM * 1 mL in DMSO USD 154 In-stock
Estimated Time of Arrival: December 31
5 mg USD 140 In-stock
Estimated Time of Arrival: December 31
10 mg USD 240 In-stock
Estimated Time of Arrival: December 31
25 mg USD 540 In-stock
Estimated Time of Arrival: December 31
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Ethynylcytidine is a new nucleoside antimetabolite.

IC50 & Target

nucleoside antimetabolite[1]

In Vitro

The IC50 values of Ethynylcytidine in the five human tumors with 4, 24 and 72 h exposure range from 0.114 to 1.032 μM, 0.015 to 0.067 μM, and 0.008 to 0.058 μM, respectively. These results suggest that the cytotoxicity of Ethynylcytidine tends to become stronger as the exposure time becomes longer. The differences in IC50 values between the 24 and 72 h exposure times are not large, and Ethynylcytidine appeares to show sufficiently potent cytotoxicity at the 24 h exposure time in all 5 human tumors. Even at the 4 h exposure time, Ethynylcytidine clearly shows potent cytotoxicity with IC50 values at submicromolar concentrations in 4 of the 5 human tumors[1].

In Vivo

In both OCUM-2MD3 and LX-1 xenografts, tumor regression is noted and a very potent antitumor effect with an tumor growth inhibition rate (IR) on day 15 of approximately 90% or even higher is observed at the minimum toxic doses of Ethynylcytidine (TAS-106) on all three administration schedules. In particular, administration of Ethynylcytidine at 6 mg/kg once weekly exhibits a marked tumor shrinking effect with an IR of 98% against the LX-1 tumor. While Ethynylcytidine treatment on an either 3 or 5 times weekly schedule has a potent antitumor effect with an IR of approximately 85%, the IR of Ethynylcytidine once weekly is less than 60% and its antitumor effect is rather weak[1].

Clinical Trial
Powder -20°C 3 years
  4°C 2 years
In solvent -80°C 6 months
  -20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : 83.3 mg/mL (311.70 mM; Need ultrasonic and warming)

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 3.7420 mL 18.7098 mL 37.4195 mL
5 mM 0.7484 mL 3.7420 mL 7.4839 mL
10 mM 0.3742 mL 1.8710 mL 3.7420 mL
*Please refer to the solubility information to select the appropriate solvent.
Cell Assay

MIAPaCa-2 cells are maintained in Dulbecco’s modified Eagle’s medium supplemented with 10% FCS and 2.5% horse serum. Cells in the exponential growth phase are seeded onto 6-well plates (5×104 cells/1.8 mL/well) on day 0. Twenty-four hours after seeding, on day 1, Ethynylcytidine (TAS-106) (6 concentrations range from 0 to 100 μM) is added to cultured cells (3 wells at each concentration) at a volume of 0.2 mL/well. After 4 and 24 h, on the 4 and 24 h Ethynylcytidine exposure schedules, the drug-containing medium is removed, and the cells are washed twice with Dulbecco’s phosphate buffered saline and subsequently cultured in drug-free medium until day 4. On the 72 h exposure schedule, after adding the Ethynylcytidine, cells are cultured continuously until day 4. On day 4, cell numbers are determined and converted to values related to the cell numbers on day 1. The concentration of Ethynylcytidine which inhibits cell growth by 50% (IC50) is calculated from this relative cell growth. Two or three individual experiments are conducted on each cell line to confirm reproducibility[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration

Nude rats s.c. transplanted with LX-1 human lung tumors are given a single i.v. dose of [3H]Ethynylcytidine (TAS-106) (6 mg/kg, 3.7 MBq/kg). For analysis of the distribution of radioactivity and intratumoral Ethynylcytidine metabolism, serum and various tissues (tumor, skin, lung, liver, kidney, spleen, small intestine, large intestine, testis, brain, and bone marrow cells) are sampled from 3 rats at each of the following 6 time points: 0.5, 1, 2, 4, 8 and 24 h after i.v. administration. At each point in time, bone marrow cells are collected from the 3 rats and combined into a cell pellet. All samples of serum, bone marrow cell pellets, and tissues are immediately frozen on dry ice and stored at -30°C until used[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight







Room temperature in continental US; may vary elsewhere

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Cat. No.: HY-16200