Date published: 2026-6-5

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Tetrahydrouridine (CAS 18771-50-1)

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Alternate Names:
3,4,5,6-Tetrahydrouridine; THU
Application:
Tetrahydrouridine is a CDD inhibitor which may prevent growth of CDA-expressing tumors
CAS Number:
18771-50-1
Purity:
≥80%
Molecular Weight:
248.23
Molecular Formula:
C9H16N2O6
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Tetrahydrouridine is a chemical compound known for its role as a modulator of biochemical processes. It is characterized by its ability to inhibit cytidine deaminase, an enzyme that is involved in the metabolism of certain nucleosides within cells. By hindering this enzyme, tetrahydrouridine can affect the breakdown and utilization of these nucleosides. In various research applications, tetrahydrouridine is used to study enzyme kinetics and to investigate the metabolic pathways of nucleosides. Its ability to modulate enzyme activity makes it useful for scientists exploring the complex web of biochemical reactions that occur within living organisms.


Tetrahydrouridine (CAS 18771-50-1) References

  1. Stability of 5-fluoro-2'-deoxycytidine and tetrahydrouridine in combination.  |  Guo, D., et al. 2010. AAPS PharmSciTech. 11: 247-52. PMID: 20151336
  2. Effects of tetrahydrouridine on pharmacokinetics and pharmacodynamics of oral decitabine.  |  Lavelle, D., et al. 2012. Blood. 119: 1240-7. PMID: 22160381
  3. Tetrahydrouridine inhibits cell proliferation through cell cycle regulation regardless of cytidine deaminase expression levels.  |  Funamizu, N., et al. 2012. PLoS One. 7: e37424. PMID: 22616006
  4. Subchronic oral toxicity study of decitabine in combination with tetrahydrouridine in CD-1 mice.  |  Terse, P., et al. 2014. Int J Toxicol. 33: 75-85. PMID: 24639139
  5. Validation of a hydrophilic interaction ultra-performance liquid chromatography-tandem mass spectrometry method for the determination of gemcitabine in human plasma with tetrahydrouridine.  |  Mano, Y., et al. 2015. Biomed Chromatogr. 29: 1343-9. PMID: 25641274
  6. Tetrahydrouridine, cytidine analogues, and hemoglobin F.  |  DeSimone, J., et al. 1985. Am J Hematol. 18: 283-8. PMID: 2579548
  7. Preclinical studies of 5-fluoro-2'-deoxycytidine and tetrahydrouridine in pediatric brain tumors.  |  Morfouace, M., et al. 2016. J Neurooncol. 126: 225-34. PMID: 26518542
  8. Selective radiosensitization and cytotoxicity of human melanoma cells using halogenated deoxycytidines and tetrahydrouridine.  |  Lawrence, TS. and Davis, MA. 1989. Int J Radiat Oncol Biol Phys. 16: 1243-6. PMID: 2715074
  9. A pilot clinical trial of the cytidine deaminase inhibitor tetrahydrouridine combined with decitabine to target DNMT1 in advanced, chemorefractory pancreatic cancer.  |  Sohal, D., et al. 2020. Am J Cancer Res. 10: 3047-3060. PMID: 33042633
  10. In vitro drug-drug interactions of decitabine and tetrahydrouridine involving drug transporters and drug metabolising enzymes.  |  Säll, C. and Fogt Hjorth, C. 2022. Xenobiotica. 52: 1-15. PMID: 34913834
  11. Effects of tetrahydrouridine on the uptake and metabolism of 1-beta-D-arabinofuranosylcytosine in human normal and leukemic cells.  |  Ho, DH., et al. 1980. Cancer Res. 40: 2444-6. PMID: 6248205
  12. Use of 5-fluorodeoxycytidine and tetrahydrouridine to exploit high levels of deoxycytidylate deaminase in tumors to achieve DNA- and target-directed therapies.  |  Mekras, JA., et al. 1984. Cancer Res. 44: 2551-60. PMID: 6539164

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Tetrahydrouridine, 10 mg

sc-204339
10 mg
$416.00

After reconstituting the THU in water and freezing at -20C: after we thaw the aliquot for use, how long is the reconstituted THU stable at 4C?

Asked by: RWMN
Thank you for your question . -20ºC is the recommended long term storage condition (acceptable range: -10 to -25ºC). We do not test for storage once in solution.
Answered by: BlakeJ
Date published: 2025-02-07

Could it be stored at 4ºC? The shipment is at -20ºC or refrigerated? Thank you.

Asked by: NitaCat
Thank you for your question. This product is shipped at +4 °C. For long-term storage, the compound should be kept at -20 °C.
Answered by: Tech Support Europe
Date published: 2021-07-23

How is this chemical supposed to be handled safely? What kind of PPE is required? Thank you.

Asked by: LarisaAkop
Thank you for your question. Please refer to the Safety Datasheet (SDS) available for download on our website for this chemical. Sections 7 (HANDLING AND STORAGE) and 8 (EXPOSURE CONTROLS/PERSONAL PROTECTION). A link is provided below for your reference. http://datasheets.scbt.com/sds/aghs/en/sc-204339.pdf
Answered by: Technical Support
Date published: 2017-11-14

Hi there, can THU be safely kept at -40 deg C and for how long approx? Kind regards, Astrid

Asked by: Astrid
Thank you for your question. It is safe to store this chemical at - 40 degrees C. We do not characterize an expiration date for this chemical, but we do warranty it for one year from the date of purchase.
Answered by: Technical Support
Date published: 2017-09-07

What is the solubility of this product?

Asked by: hawkeye11
This chemical, Tetrahydrouridine (CAS 18771-50-1), is soluble in 100% methanol (~10 mg/ml).
Answered by: Chemical Support 1
Date published: 2017-03-15
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Rated 5 out of 5 by from FunamizuFunamizu, N. et al. (PubMed 22616006) found that Tetrahydrouridine (THU), a potent competitive inhibitor of cytidine deaminase, caused an increased rate of G1-phase occurrence while S-phase occurrence was diminished. Similarly, Ki-67 staining further supported that THU reduces cell proliferation and regulates cell cycle progression at the G1/S checkpoint by suppressing E2F1. -SCBT Publication Review
Date published: 2015-05-10
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Tetrahydrouridine is rated 5.0 out of 5 by 1.
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