AZ191

In vitro drug release experiments demonstrated that AZ191 exhibited rapid release within the first three hours with a cumulative release of approximately 26%, whereas cisplatin showed minimal early release (∼5%) followed by a markedly accelerated release. In vitro antitumor studies confirmed that the combined chemo-hyperthermia treatment using the core-shell MSs produced the most effective inhibitory effect on drug-resistant OC cells, reducing cell viability to 21% after 48 h, significantly outperforming either chemotherapy or hyperthermia alone. This strategy enables a "resistance-reversal first, precision-killing later" treatment model, offering a novel and effective solution for the treatment of drug-resistant OC.

We report the crystal structure of DYRK1B in complex with the small-molecule inhibitor AZ191...Moreover, detailed evaluation of the active site architecture reveals a notable difference in the accessibility of the catalytic lysine residue between DYRK1B and DYRK1A, suggesting potential strategies to distinguish selective binders. Overall, these findings provide important macromolecular insights into the DYRK1B structure and offer a structural framework to guide medicinal chemistry efforts towards improved inhibitor selectivity with minimized off-target activity.

In this review, apart from summarizing the data establishing Dyrk1B as a therapeutic target in cancer, we highlight the most potent Mirk/Dyrk1B inhibitors recently reported. We also discuss the limitations and perspectives for the structure-based design of Mirk/Dyrk1B potent and highly selective inhibitors based on the accumulated structural data of Dyrk1A and the recent crystal structure of Dyrk1B with AZ191 inhibitor.

Combined treatment with the DYRK1B inhibitor AZ191 and IR resulted in (supra-) additive tumor cell killing in colorectal tumor cell systems and in primary CRC organoids. Mechanistic investigations support the rational to target the stress-enhanced survival kinase DYRK1B in combination with irradiation to overcome hypoxia- and starvation-induced treatment resistances.