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A Highly Selective Chemical Probe for Activin Receptor-like Kinases ALK4 and ALK5
Thomas Hanke1, Jong Fu Wong2, Benedict-Tilman Berger1
1Structural Genomics Consortium, Institute for Pharmaceutical Chemistry and Buchmann Institute for Molecular Life Sciences, Johann Wolfgang Goethe-University, Max-von-Laue-Str. 9, D-60438 Frankfurt am Main, Germany.
Abstract:
The transforming growth factor beta-receptor I/activin receptor-like kinase 5 (TGFBR1/ALK5) and its close homologue ALK4 are receptor protein kinases associated with the development of diverse diseases, including cancer, fibrosis, heart diseases, and dysfunctional immune response. Therefore, ALK4/5 are among the most studied kinases, and several inhibitors have been developed. However, current commercially available inhibitors either lack selectivity or have not been comprehensively characterized, limiting their value for studying ALK4/5 function in cellular systems. To this end, we report the characterization of the 2-oxo-imidazopyridine, TP-008, a potent chemical probe with dual activity for ALK4 and ALK5 as well as the development of a matching negative control compound. TP-008 has excellent cellular potency and strongly abrogates phosphorylation of the substrate SMAD2 (mothers against decapentaplegic homologue 2). Thus, this chemical probe offers an excellent tool for mechanistic studies on the ALK4/5 signaling pathway and the contribution of these targets to disease.
Insights
Researchers developed TP-008, a selective chemical probe targeting transforming growth factor beta-receptor I/activin receptor-like kinase 5 (TGFBR1/ALK5) and ALK4. This tool aids in studying these kinases
Area of Science:
- Molecular Biology
- Biochemistry
- Pharmacology
Background:
- Transforming growth factor beta-receptor I/activin receptor-like kinase 5 (TGFBR1/ALK5) and ALK4 are key kinases implicated in diseases like cancer and fibrosis.
- Existing ALK4/5 inhibitors lack selectivity or comprehensive characterization, hindering their use in cellular research.
- Targeting the ALK4/5 pathway is crucial for understanding and treating various pathologies.
Purpose of the Study:
- To characterize TP-008, a novel chemical probe with dual activity against ALK4 and ALK5.
- To develop a matching negative control compound for TP-008.
- To provide a reliable tool for mechanistic studies of the ALK4/5 signaling pathway.
Main Methods:
- Synthesis and characterization of TP-008, a 2-oxo-imidazopyridine derivative.
- Assessment of TP-008's cellular potency and inhibitory activity.
- Evaluation of TP-008's effect on SMAD2 phosphorylation, a downstream target of ALK4/5.
Main Results:
- TP-008 demonstrates potent dual inhibitory activity against ALK4 and ALK5.
- The compound effectively abrogates phosphorylation of the substrate SMAD2 in cellular systems.
- A matching negative control compound was successfully developed alongside TP-008.
Conclusions:
- TP-008 serves as a valuable and selective chemical probe for studying ALK4/5 kinases.
- This probe facilitates mechanistic investigations into the role of ALK4/5 signaling in disease.
- The availability of TP-008 and its control compound enhances research on ALK4/5-mediated pathologies.
