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Thale I, Maskri S, Grey L, Todesca LM, Budde T, Maisuls I, Strassert CA, Koch O, Schwab A, Wünsch B. Imaging of K Ca 3.1 Channels in Tumor Cells with PET and Small-Molecule Fluorescent Probes. ChemMedChem 2023; 18:e202200551. [PMID: 36315933 PMCID: PMC10098740 DOI: 10.1002/cmdc.202200551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/31/2022] [Indexed: 01/20/2023]
Abstract
The Ca2+ activated K+ channel KCa 3.1 is overexpressed in several human tumor cell lines, e. g. clear cell renal carcinoma, prostate cancer, non-small cell lung cancer. Highly aggressive cancer cells use this ion channel for key processes of the metastatic cascade such as migration, extravasation and invasion. Therefore, small molecules, which are able to image this KCa 3.1 channel in vitro and in vivo represent valuable diagnostic and prognostic tool compounds. The [18 F]fluoroethyltriazolyl substituted senicapoc was used as positron emission tomography (PET) tracer and showed promising properties for imaging of KCa 3.1 channels in lung adenocarcinoma cells in mice. The novel senicapoc BODIPY conjugates with two F-atoms (9 a) and with a F-atom and a methoxy moiety (9 b) at the B-atom led to the characteristic punctate staining pattern resulting from labeling of single KCa 3.1 channels in A549-3R cells. This punctate pattern was completely removed by preincubation with an excess of senicapoc confirming the high specificity of KCa 3.1 labeling. Due to the methoxy moiety at the B-atom and the additional oxyethylene unit in the spacer, 9 b exhibits higher polarity, which improves solubility and handling without reduction of fluorescence quantum yield. Docking studies using a cryo-electron microscopy (EM) structure of the KCa 3.1 channel confirmed the interaction of 9 a and 9 b with a binding pocket in the channel pore.
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Affiliation(s)
- Insa Thale
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Sarah Maskri
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Lucie Grey
- Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Luca Matteo Todesca
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology II, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Thomas Budde
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology I, Robert-Koch-Straße 27a, 48149, Münster, Germany
| | - Ivan Maisuls
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie CiMIC, SoN, Corrensstraße 28, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, CeNTech, Heisenbergstraße 11, 48149, Münster, Germany
| | - Cristian A Strassert
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie CiMIC, SoN, Corrensstraße 28, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, CeNTech, Heisenbergstraße 11, 48149, Münster, Germany
| | - Oliver Koch
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Albrecht Schwab
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology II, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Bernhard Wünsch
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
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Bauer N, Maisuls I, Pereira da Graça A, Reinhardt D, Erapaneedi R, Kirschnick N, Schäfers M, Grashoff C, Landfester K, Vestweber D, Strassert CA, Kiefer F. Genetically encoded dual fluorophore reporters for graded oxygen-sensing in light microscopy. Biosens Bioelectron 2022; 221:114917. [DOI: 10.1016/j.bios.2022.114917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 10/31/2022] [Accepted: 11/13/2022] [Indexed: 11/18/2022]
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Brömmel K, Maskri S, Maisuls I, Konken CP, Rieke M, Pethő Z, Strassert CA, Koch O, Schwab A, Wünsch B. Synthesis of Small‐Molecule Fluorescent Probes for the In Vitro Imaging of Calcium‐Activated Potassium Channel K
Ca
3.1. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kathrin Brömmel
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University Münster Corrensstraße 48 48149 Münster Germany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University Münster Waldeyerstraße 15 84149 Münster Germany
| | - Sarah Maskri
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University Münster Corrensstraße 48 48149 Münster Germany
| | - Ivan Maisuls
- Center for NanotechnologyCenter for Soft NanoscienceInstitute for Inorganic and Analytical ChemistryWestphalian Wilhelms-University Münster Heisenbergstraße 11 48149 Münster Germany
| | - Christian Paul Konken
- Department of Nuclear MedicineUniversity Hospital Münster Albert-Schweitzer-Campus 1, Building A1 48149 Münster Germany
| | - Marius Rieke
- Institute for Physiology IIUniversity Hospital Münster Robert-Koch-Straße 27b 48149 Münster Germany
| | - Zoltan Pethő
- Institute for Physiology IIUniversity Hospital Münster Robert-Koch-Straße 27b 48149 Münster Germany
| | - Cristian A. Strassert
- Center for NanotechnologyCenter for Soft NanoscienceInstitute for Inorganic and Analytical ChemistryWestphalian Wilhelms-University Münster Heisenbergstraße 11 48149 Münster Germany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University Münster Waldeyerstraße 15 84149 Münster Germany
| | - Oliver Koch
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University Münster Corrensstraße 48 48149 Münster Germany
| | - Albrecht Schwab
- Institute for Physiology IIUniversity Hospital Münster Robert-Koch-Straße 27b 48149 Münster Germany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University Münster Corrensstraße 48 48149 Münster Germany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University Münster Waldeyerstraße 15 84149 Münster Germany
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Brömmel K, Maskri S, Maisuls I, Konken CP, Rieke M, Pethő Z, Strassert CA, Koch O, Schwab A, Wünsch B. Synthesis of Small-Molecule Fluorescent Probes for the In Vitro Imaging of Calcium-Activated Potassium Channel K Ca 3.1. Angew Chem Int Ed Engl 2020; 59:8277-8284. [PMID: 32097518 PMCID: PMC7318252 DOI: 10.1002/anie.202001201] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/19/2020] [Indexed: 01/15/2023]
Abstract
Small-molecule probes for the in vitro imaging of KCa 3.1 channel-expressing cells were developed. Senicapoc, showing high affinity and selectivity for the KCa 3.1 channels, was chosen as the targeting component. BODIPY dyes 15-20 were synthesized and connected by a CuI -catalyzed azide-alkyne [3+2]cycloaddition with propargyl ether senicapoc derivative 8, yielding fluorescently labeled ligands 21-26. The dimethylpyrrole-based imaging probes 25 and 26 allow staining of KCa 3.1 channels in NSCLC cells. The specificity was shown by removing the punctate staining pattern by pre-incubation with senicapoc. The density of KCa 3.1 channels detected with 25 and by immunostaining was identical. The punctate structure of the labeled channels could also be observed in living cells. Molecular modeling showed binding of the senicapoc-targeting component towards the binding site within the ion channel and orientation of the linker with the dye along the inner surface of the ion channel.
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Affiliation(s)
- Kathrin Brömmel
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Corrensstraße 48, 48149, Münster, Germany
- Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Waldeyerstraße 15, 84149, Münster, Germany
| | - Sarah Maskri
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Corrensstraße 48, 48149, Münster, Germany
| | - Ivan Maisuls
- Center for Nanotechnology, Center for Soft Nanoscience, Institute for Inorganic and Analytical Chemistry, Westphalian Wilhelms-University Münster, Heisenbergstraße 11, 48149, Münster, Germany
| | - Christian Paul Konken
- Department of Nuclear Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Marius Rieke
- Institute for Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Zoltan Pethő
- Institute for Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Cristian A Strassert
- Center for Nanotechnology, Center for Soft Nanoscience, Institute for Inorganic and Analytical Chemistry, Westphalian Wilhelms-University Münster, Heisenbergstraße 11, 48149, Münster, Germany
- Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Waldeyerstraße 15, 84149, Münster, Germany
| | - Oliver Koch
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Corrensstraße 48, 48149, Münster, Germany
| | - Albrecht Schwab
- Institute for Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Corrensstraße 48, 48149, Münster, Germany
- Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Waldeyerstraße 15, 84149, Münster, Germany
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