Faculty, Staff and Student Publications
Language
English
Publication Date
10-14-2025
Journal
Blood Advances
DOI
10.1182/bloodadvances.2025016511
PMID
40690748
PMCID
PMC12514485
PubMedCentral® Posted Date
7-23-2025
PubMedCentral® Full Text Version
Post-print
Abstract
Nongenetic transcription evolution has been increasingly explored and recognized to drive tumor cell progression and therapeutic resistance. As the regulation hub of transcription machinery, cyclin-dependent kinase 9 (CDK9) is the gatekeeper of RNA polymerase II transcription, and CDK9 dysfunction results in transcriptomic reprogramming and tumor cell progression. We recently reported that the heat shock protein 90 (HSP90)-MYC-CDK9 network drives therapeutic resistance in mantle cell lymphoma (MCL) through transcriptomic reprogramming. We also showed that targeting CDK9 by AZD4573 and enitociclib is a safe and effective treatment in preclinical Mantle Cell Lymphoma (MCL) models, supporting CDK9 as a valid therapeutic target for MCL. However, current CDK9 inhibitors (CDK9is) under therapeutic development have room for improvement due to limited target selectivity and oral bioavailability. To this end, YX0798 was discovered to be a novel CDK9i through structural optimization. YX0798 demonstrated remarkable target selectivity and high affinity in binding to CDK9. Furthermore, YX0798 showed good oral bioavailability. YX0798, when administrated orally (5 mg/kg daily), led to an efficacious antitumor activity in vivo and showed the potency in overcoming therapeutic resistance. Mechanistically, YX0798 downregulated the short-lived oncoprotein c-MYC and prosurvival protein myeloid cell leukemia sequence 1 (MCL-1) as a common mechanism of CDK9 inhibition. Moreover, YX0798 disrupted the cell cycle and resulted in transcriptomic reprogramming, eventually leading to cell death. Furthermore, YX0798 has the potential to be used in combination therapy with clinical agents to improve treatment efficacy. Together, these data demonstrate that YX0798 has oral bioavailability, exquisite selectivity, and antitumor potency that results from driving transcription reprogramming toward tumor cell killing.
Keywords
Cyclin-Dependent Kinase 9, Humans, Animals, Protein Kinase Inhibitors, Mice, Cell Line, Tumor, Xenograft Model Antitumor Assays, Administration, Oral, Antineoplastic Agents, Lymphoma, Mantle-Cell
Published Open-Access
yes
Recommended Citation
Jiang, Vivian; Xue, Yu; Kim, Hong; et al., "YX0798 Is a Highly Potent, Selective, and Orally Effective CDK9 Inhibitor for Treating Aggressive Lymphoma" (2025). Faculty, Staff and Student Publications. 6194.
https://digitalcommons.library.tmc.edu/uthgsbs_docs/6194
Graphical Abstract
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Bioinformatics Commons, Biomedical Informatics Commons, Genetic Phenomena Commons, Medical Genetics Commons, Oncology Commons