TDO-HEK293 Recombinant Cell line

Catalog #: 60534
Size: 2 vials
L-tryptophan (L-Trp) is an essential amino acid necessary for protein synthesis in mammalian cells and the L-Trp to kynurenine (Kyn) pathway is firmly established as a key regulator of innate and adaptive immunity. Catabolism of L-Trp to Kyn maintains an immunosuppressive microenvironment by starving immune cells of L-Trp and releasing degradation products of L-Trp that have immunosuppressive functions. Tryptophan 2,3 dioxygenase (TDO), is upregulated in many tumors, providing cancer cells with an avenue for immune evasion.

Stable recombinant HEK293 cell line expressing human tryptophan 2,3 dioxygenase (TDO2, TDO, TPH2, TRPO), Genbank accession number NM_005651.

Materials Required But Not Provided:

• Assay Medium: Thaw Medium 1 (BPS Cat. #60187)

Growth Medium 1B (BPS Cat. #79531)

• Geneticin


• 0.05% Trypsin EDTA

• 6.1 N Trichloroacetic acid (Sigma #T0699)

• Acetic acid (Sigma #320099) 

• TDO Cellular Activity QuickDetectTM Supplements (BPS Cat. #62002). Note: other formulations can be used, but significant optimization may be required.  

tryptophan 2,3 dioxygenase, TDO2, TDO, TPH2, TRPO
Host Cell line:
Mycoplasma Testing:
The cell line has been screened using the PCR-based VenorGeM Mycoplasma Detection kit (Sigma-Aldrich) to confirm the absence of Mycoplasma species.
Growth Media:

Thaw Medium 1 (BPS Cat. #60187): MEM medium (Hyclone #SH30024.01) supplemented with 10% FBS (Invitrogen #26140-079), 1% non-essential amino acids (Hyclone #SH30238.01), 1 mM Na pyruvate (Hyclone #SH30239.01), 1% Penicillin/Streptomycin (Hyclone SV30010.01).

Growth Medium 1B (BPS Cat. #79531): Thaw Medium 1 (BPS Cat. #60187) plus 400 µg/ml of Geneticin (Life Technologies #11811031) to ensure that recombinant expression is maintained. hTDO-HEK293 cells should exhibit a typical cell division time of ~33 hours.

Storage / Stability:
Immediately upon receipt, store vials in liquid nitrogen
Monitor TDO pathway activity. Screen for activators or inhibitors of TDO in a cellular context

1. Liu, X., et al., Blood. 2010; 115(17): 3520-3530.


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License Disclosure:Purchase of this cell line grants you with a 10-year license to use this cell line in your immediate laboratory, for research use only. This license does not permit you to share, distribute, sell, sublicense, or otherwise make the cell line available for use to other laboratories, departments, research institutions, hospitals, universities, or biotech companies. The license does not permit use of this cell line in humans or for therapeutic or drug use. The license does not permit modification of the cell line in any way. Inappropriate use or distribution of this cell line will result in revocation of the license and result in an immediate cease of sales and distribution of BPS products to your laboratory. BPS does not warrant the suitability of the cell line for any particular use, and does not accept any liability in connection with the handling or use of the cell line. Modifications of this cell line, transfer to another facility, or commercial use of the cells may require a separate license and additional fees; contact for details. Publications using this cell line should reference BPS Bioscience, Inc., San Diego.

Avoid freeze/thaw cycles
Scientific Category:
Product Type:
Cell Line
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