Version 2 2025-04-03, 21:47Version 2 2025-04-03, 21:47
Version 1 2024-10-16, 10:20Version 1 2024-10-16, 10:20
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posted on 2025-04-03, 21:47authored byLi-Wei Kuo, Lyndsey S. Crump, Kathleen O’Neill, Michelle M. Williams, Jessica L. Christenson, Nicole S. Spoelstra, Micaela Kalani Roy, Amy Argabright, Julie A. Reisz, Angelo D’Alessandro, Meher P. Boorgula, Andrew Goodspeed, Mike Bickerdike, Benjamin G. Bitler, Jennifer K. Richer
<p>KD of <i>TDO2</i> can increase IDO1 expression and activity in a compensatory manner. Stable genetic KD <i>TDO2</i> (sh<i>TDO2</i>) or scramble control (shSCR) in BT549 cells. <b>A,</b> Immunoblot of TDO2 and IDO1. <b>B,</b> Catabolite level shown in peak area (mean ± SEM) of formyl-KYN and KYN as measured by steady-state metabolomics in conditioned media from BT549 with sh<i>TDO2</i> or shSCR control. <b>C,</b> Activated AhR-regulated genes <i>CYP1A1</i> and <i>CYP1B1</i> with and without shTDO2. Data are displayed as mean ± SD with one-way ANOVA analysis. *, <i>P</i> < 0.05; **, <i>P</i> < 0.01; ***, <i>P</i> < 0.001; ****, <i>P</i> < 0.0001.</p>
TDO2 is more highly expressed than the nonhomologous TRP-catabolizing enzyme IDO1 in TNBC. We find that TDO2 knockdown can lead to a compensatory increase in IDO1. Therefore, we tested a newly developed TDO2/IDO1 dual inhibitor and found that it decreases TRP catabolism, anchorage-independent survival, and invasive capacity.