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Futosi K, Bajza B, Deli D, Erdélyi A, Tusnády S, Mócsai A. Analysis of intracellular tyrosine phosphorylation in circulating neutrophils as a rapid assay for the in vivo effect of oral tyrosine kinase inhibitors. Front Pharmacol 2023; 14:1056154. [PMID: 37089957 PMCID: PMC10117656 DOI: 10.3389/fphar.2023.1056154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 02/24/2023] [Indexed: 04/08/2023] Open
Abstract
Tyrosine kinases are crucial signaling components of diverse biological processes and are major therapeutic targets in various malignancies and immune-mediated disorders. A critical step of development of novel tyrosine kinase inhibitors is the transition from the confirmation of the in vitro effects of drug candidates to the analysis of their in vivo efficacy. To facilitate this transition, we have developed a rapid in vivo assay for the analysis of the effect of oral tyrosine kinase inhibitors on basal tyrosine phosphorylation of circulating mouse neutrophils. The assay uses a single drop of peripheral blood without sacrificing the mice. Flow cytometry using intracellular staining by fluorescently labeled anti-phosphotyrosine antibodies revealed robust basal tyrosine phosphorylation in resting circulating neutrophils. This signal was abrogated by the use of isotype control antibodies or by pre-saturation of the anti-phosphotyrosine antibodies with soluble phosphotyrosine amino acids or tyrosine-phosphorylated peptides. Basal tyrosine phosphorylation was dramatically reduced in neutrophils of triple knockout mice lacking the Src-family tyrosine kinases Hck, Fgr, and Lyn. Neutrophil tyrosine phosphorylation was also abrogated by oral administration of the Abl/Src-family inhibitor dasatinib, a clinically used anti-leukemic agent. Detailed dose-response and kinetic studies revealed half-maximal reduction of neutrophil tyrosine phosphorylation by 2.9 mg/kg dasatinib, with maximal reduction observed 2 h after inhibitor administration. Taken together, our assay allows highly efficient analysis of the in vivo effect of orally administered tyrosine kinase inhibitors, and may be used as a suitable alternative to other existing approaches.
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Affiliation(s)
- Krisztina Futosi
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
- ELKH-SE Inflammation Physiology Research Group, Eötvös Loránd Research Network, Budapest, Hungary
- *Correspondence: Krisztina Futosi,
| | - Boglárka Bajza
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Dorottya Deli
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - András Erdélyi
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Simon Tusnády
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Attila Mócsai
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
- ELKH-SE Inflammation Physiology Research Group, Eötvös Loránd Research Network, Budapest, Hungary
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Kruk M, Widstrom N, Jena S, Wolter NL, Blankenhorn JF, Abdalla I, Yang TY, Parker LL. Assays for tyrosine phosphorylation in human cells. Methods Enzymol 2019; 626:375-406. [PMID: 31606083 DOI: 10.1016/bs.mie.2019.06.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Tyrosine kinases are important for many cellular processes and disruption of their regulation is a factor in diseases like cancer, therefore they are a major target of anticancer drugs. There are many ways to measure tyrosine kinase activity in cells by monitoring endogenous substrate phosphorylation, or by using peptide substrates and incubating them with cell lysates containing active kinases. However, most of these strategies rely on antibodies and/or are limited in how accurately they model the intracellular environment. In cases in which activity needs to be measured in cells, but endogenous substrates are not known and/or suitable phosphospecific antibodies are not available, cell-deliverable peptide substrates can be an alternative and can provide information on activation and inhibition of kinases in intact, live cells. In this chapter, we review this methodology and provide a protocol for measuring Abl kinase activity in human cells using enzyme-linked immunosorbent assay (ELISA) with a generic antiphosphotyrosine antibody for detection.
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Affiliation(s)
- Monica Kruk
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Naomi Widstrom
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Sampreeti Jena
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Nicole L Wolter
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - John F Blankenhorn
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Ibrahim Abdalla
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Tzu-Yi Yang
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Laurie L Parker
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States.
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