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Haase T, Ludwig A, Stach A, Mohtashamdolatshahi A, Hauptmann R, Mundhenk L, Kratz H, Metzkow S, Kader A, Freise C, Mueller S, Stolzenburg N, Radon P, Liebl M, Wiekhorst F, Hamm B, Taupitz M, Schnorr J. Repeated Injection of Very Small Superparamagnetic Iron Oxide Particles (VSOPs) in Murine Atherosclerosis: A Safety Study. Nanomaterials (Basel) 2024; 14:773. [PMID: 38727367 PMCID: PMC11085881 DOI: 10.3390/nano14090773] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/09/2024] [Accepted: 04/22/2024] [Indexed: 05/12/2024]
Abstract
Citrate-coated electrostatically stabilized very small superparamagnetic iron oxide particles (VSOPs) have been successfully tested as magnetic resonance angiography (MRA) contrast agents and are promising tools for molecular imaging of atherosclerosis. Their repeated use in the background of pre-existing hyperlipidemia and atherosclerosis has not yet been studied. This study aimed to investigate the effect of multiple intravenous injections of VSOPs in atherosclerotic mice. Taurine-formulated VSOPs (VSOP-T) were repeatedly intravenously injected at 100 µmol Fe/kg in apolipoprotein E-deficient (ApoE KO) mice with diet-induced atherosclerosis. Angiographic imaging was carried out by in vivo MRI. Magnetic particle spectrometry was used to detect tissue VSOP content, and tissue iron content was quantified photometrically. Pathological changes in organs, atherosclerotic plaque development, and expression of hepatic iron-related proteins were evaluated. VSOP-T enabled the angiographic imaging of heart and blood vessels with a blood half-life of one hour. Repeated intravenous injection led to VSOP deposition and iron accumulation in the liver and spleen without affecting liver and spleen pathology, expression of hepatic iron metabolism proteins, serum lipids, or atherosclerotic lesion formation. Repeated injections of VSOP-T doses sufficient for MRA analyses had no significant effects on plaque burden, steatohepatitis, and iron homeostasis in atherosclerotic mice. These findings underscore the safety of VSOP-T and support its further development as a contrast agent and molecular imaging tool.
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Affiliation(s)
- Tobias Haase
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Antje Ludwig
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Charitéplatz 1, 10117 Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, 10117 Berlin, Germany
| | - Anke Stach
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Cardiology, Angiology and Intensive Care Medicine, Deutsches Herzzentrum der Charité, Charitéplatz 1, 10117 Berlin, Germany
| | - Azadeh Mohtashamdolatshahi
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Ralf Hauptmann
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Lars Mundhenk
- Institute of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Str. 15, 14163 Berlin, Germany;
| | - Harald Kratz
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Susanne Metzkow
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Avan Kader
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
- Department of Diagnostic and Interventional Radiology, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Christian Freise
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Susanne Mueller
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Experimental Neurology, Center for Stroke Research Berlin (CSB), Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
- Charité 3R|Replace, Reduce, Refine, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
- NeuroCure Cluster of Excellence and Charité Core Facility 7T Experimental MRIs, Charité—Universitätsmedizin Berlin, 10117 Berlin, Germany
| | - Nicola Stolzenburg
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Patricia Radon
- Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany; (P.R.); (M.L.); (F.W.)
| | - Maik Liebl
- Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany; (P.R.); (M.L.); (F.W.)
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany; (P.R.); (M.L.); (F.W.)
| | - Bernd Hamm
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Matthias Taupitz
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - Jörg Schnorr
- Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany; (A.L.); (A.M.); (R.H.); (H.K.); (S.M.); (A.K.); (C.F.); (S.M.); (N.S.); (B.H.); (M.T.); (J.S.)
- Department of Radiology, Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany
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Kratz H, Mohtashamdolatshahi A, Eberbeck D, Kosch O, Wiekhorst F, Taupitz M, Hamm B, Stolzenburg N, Schnorr J. Tailored Magnetic Multicore Nanoparticles for Use as Blood Pool MPI Tracers. Nanomaterials (Basel) 2021; 11:nano11061532. [PMID: 34200588 PMCID: PMC8228684 DOI: 10.3390/nano11061532] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/03/2021] [Accepted: 06/07/2021] [Indexed: 01/10/2023]
Abstract
For the preclinical development of magnetic particle imaging (MPI) in general, and the exploration of possible new clinical applications of MPI in particular, tailored MPI tracers with surface properties optimized for the intended use are needed. Here we present the synthesis of magnetic multicore particles (MCPs) modified with polyethylene glycol (PEG) for use as blood pool MPI tracers. To achieve the stealth effect the carboxylic groups of the parent MCP were activated and coupled with pegylated amines (mPEG-amines) with different PEG-chain lengths from 2 to 20 kDa. The resulting MCP-PEG variants with PEG-chain lengths of 10 kDa (MCP-PEG10K after one pegylation step and MCP-PEG10K2 after a second pegylation step) formed stable dispersions and showed strong evidence of a successful reaction of MCP and MCP-PEG10K with mPEG-amine with 10 kDa, while maintaining their magnetic properties. In rats, the mean blood half-lives, surprisingly, were 2 and 62 min, respectively, and therefore, for MCP-PEG10K2, dramatically extended compared to the parent MCP, presumably due to the higher PEG density on the particle surface, which may lead to a lower phagocytosis rate. Because of their significantly extended blood half-life, MCP-PEG10K2 are very promising as blood pool tracers for future in vivo cardiovascular MPI.
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Affiliation(s)
- Harald Kratz
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
- Correspondence: ; Tel.: +49-30-450-527180
| | - Azadeh Mohtashamdolatshahi
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
| | - Dietmar Eberbeck
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany; (D.E.); (O.K.); (F.W.)
| | - Olaf Kosch
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany; (D.E.); (O.K.); (F.W.)
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany; (D.E.); (O.K.); (F.W.)
| | - Matthias Taupitz
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
| | - Bernd Hamm
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
| | - Nicola Stolzenburg
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
| | - Jörg Schnorr
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, D-10117 Berlin, Germany; (A.M.); (M.T.); (B.H.); (N.S.); (J.S.)
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Mangarova DB, Brangsch J, Mohtashamdolatshahi A, Kosch O, Paysen H, Wiekhorst F, Klopfleisch R, Buchholz R, Karst U, Taupitz M, Schnorr J, Hamm B, Makowski MR. Ex vivo magnetic particle imaging of vascular inflammation in abdominal aortic aneurysm in a murine model. Sci Rep 2020; 10:12410. [PMID: 32709967 PMCID: PMC7381631 DOI: 10.1038/s41598-020-69299-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/26/2020] [Indexed: 01/06/2023] Open
Abstract
Abdominal aortic aneurysms (AAAs) are currently one of the leading causes of death in developed countries. Inflammation is crucial in the disease progression, having a substantial impact on various determinants in AAAs development. Magnetic particle imaging (MPI) is an innovative imaging modality, enabling the highly sensitive detection of magnetic nanoparticles (MNPs), suitable as surrogate marker for molecular targeting of vascular inflammation. For this study, Apolipoprotein E-deficient-mice underwent surgical implantation of osmotic minipumps with constant Angiotensin II infusion. After 3 and 4 weeks respectively, in-vivo-magnetic resonance imaging (MRI), ex-vivo-MPI and ex-vivo-magnetic particle spectroscopy (MPS) were performed. The results were validated by histological analysis, immunohistology and laser ablation-inductively coupled plasma-mass spectrometry. MR-angiography enabled the visualization of aneurysmal development and dilatation in the experimental group. A close correlation (R = 0.87) with histological area assessment was measured. Ex-vivo-MPS revealed abundant iron deposits in AAA samples and ex-vivo histopathology measurements were in good agreement (R = 0.76). Ex-vivo-MPI and MPS results correlated greatly (R = 0.99). CD68-immunohistology stain and Perls’-Prussian-Blue-stain confirmed the colocalization of macrophages and MNPs. This study demonstrates the feasibility of ex-vivo-MPI for detecting inflammation in AAA. The quantitative ability for mapping MNPs establishes MPI as a promising tool for monitoring inflammatory progression in AAA in an experimental setting.
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Affiliation(s)
- Dilyana B Mangarova
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany. .,Department of Veterinary Medicine, Institute of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Str. 15, Building 12, 14163, Berlin, Germany.
| | - Julia Brangsch
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.,Department of Veterinary Medicine, Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Freie Universität Berlin, Königsweg 67, Building 21, 14163, Berlin, Germany
| | - Azadeh Mohtashamdolatshahi
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Olaf Kosch
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Hendrik Paysen
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Frank Wiekhorst
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Robert Klopfleisch
- Department of Veterinary Medicine, Institute of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Str. 15, Building 12, 14163, Berlin, Germany
| | - Rebecca Buchholz
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, 48149, Münster, Germany
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, 48149, Münster, Germany
| | - Matthias Taupitz
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Jörg Schnorr
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Bernd Hamm
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Marcus R Makowski
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.,Department of Diagnostic and Interventional Radiology, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany
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Kratz H, Mohtashamdolatshahi A, Eberbeck D, Kosch O, Hauptmann R, Wiekhorst F, Taupitz M, Hamm B, Schnorr J. MPI Phantom Study with A High-Performing Multicore Tracer Made by Coprecipitation. Nanomaterials (Basel) 2019; 9:nano9101466. [PMID: 31623127 PMCID: PMC6835925 DOI: 10.3390/nano9101466] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 10/08/2019] [Accepted: 10/14/2019] [Indexed: 12/23/2022]
Abstract
Magnetic particle imaging (MPI) is a new imaging technique that detects the spatial distribution of magnetic nanoparticles (MNP) with the option of high temporal resolution. MPI relies on particular MNP as tracers with tailored characteristics for improvement of sensitivity and image resolution. For this reason, we developed optimized multicore particles (MCP 3) made by coprecipitation via synthesis of green rust and subsequent oxidation to iron oxide cores consisting of a magnetite/maghemite mixed phase. MCP 3 shows high saturation magnetization close to that of bulk maghemite and provides excellent magnetic particle spectroscopy properties which are superior to Resovist® and any other up to now published MPI tracers made by coprecipitation. To evaluate the MPI characteristics of MCP 3 two kinds of tube phantoms were prepared and investigated to assess sensitivity, spatial resolution, artifact severity, and selectivity. Resovist® was used as standard of comparison. For image reconstruction, the regularization factor was optimized, and the resulting images were investigated in terms of quantifying of volumes and iron content. Our results demonstrate the superiority of MCP 3 over Resovist® for all investigated MPI characteristics and suggest that MCP 3 is promising for future experimental in vivo studies.
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Affiliation(s)
- Harald Kratz
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Azadeh Mohtashamdolatshahi
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | | | - Olaf Kosch
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany.
| | - Ralf Hauptmann
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany.
| | - Matthias Taupitz
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Bernd Hamm
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Jörg Schnorr
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
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Langhorst H, Jüttner R, Groneberg D, Mohtashamdolatshahi A, Pelz L, Purfürst B, Schmidt-Ott KM, Friebe A, Rathjen FG. The IgCAM CLMP regulates expression of Connexin43 and Connexin45 in intestinal and ureteral smooth muscle contraction in mice. Dis Model Mech 2018; 11:dmm.032128. [PMID: 29361518 PMCID: PMC5894946 DOI: 10.1242/dmm.032128] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 01/09/2018] [Indexed: 11/25/2022] Open
Abstract
CAR-like membrane protein (CLMP), an immunoglobulin cell adhesion molecule (IgCAM), has been implicated in congenital short-bowel syndrome in humans, a condition with high mortality for which there is currently no cure. We therefore studied the function of CLMP in a Clmp-deficient mouse model. Although we found that the levels of mRNAs encoding Connexin43 or Connexin45 were not or were only marginally affected, respectively, by Clmp deficiency, the absence of CLMP caused a severe reduction of both proteins in smooth muscle cells of the intestine and of Connexin43 in the ureter. Analysis of calcium signaling revealed a disordered cell-cell communication between smooth muscle cells, which in turn induced an impaired and uncoordinated motility of the intestine and the ureter. Consequently, insufficient transport of chyme and urine caused a fatal delay to thrive, a high rate of mortality, and provoked a severe hydronephrosis in CLMP knockouts. Neurotransmission and the capability of smooth muscle cells to contract in ring preparations of the intestine were not altered. Physical obstructions were not detectable and an overall normal histology in the intestine as well as in the ureter was observed, except for a slight hypertrophy of smooth muscle layers. Deletion of Clmp did not lead to a reduced length of the intestine as shown for the human CLMP gene but resulted in gut malrotations. In sum, the absence of CLMP caused functional obstructions in the intestinal tract and ureter by impaired peristaltic contractions most likely due to a lack of gap-junctional communication between smooth muscle cells. Summary: The function of the immunoglobulin cell adhesion molecule CLMP was investigated in a mouse model. CLMP is essential for intestinal and ureteral peristalsis, and for expression of Connexin43 and 45 in smooth muscle cells.
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Affiliation(s)
- Hanna Langhorst
- Max-Delbrück-Center for Molecular Medicine, DE-13092 Berlin, Germany
| | - René Jüttner
- Max-Delbrück-Center for Molecular Medicine, DE-13092 Berlin, Germany
| | - Dieter Groneberg
- Physiologisches Institut der Universität Würzburg, Röntgenring 9, DE-97070 Würzburg, Germany
| | | | - Laura Pelz
- Max-Delbrück-Center for Molecular Medicine, DE-13092 Berlin, Germany
| | - Bettina Purfürst
- Max-Delbrück-Center for Molecular Medicine, DE-13092 Berlin, Germany
| | - Kai M Schmidt-Ott
- Charité-Universitätsmedizin Berlin, Department of Nephrology, Charitéplatz 1, DE-10117 Berlin, Germany
| | - Andreas Friebe
- Physiologisches Institut der Universität Würzburg, Röntgenring 9, DE-97070 Würzburg, Germany
| | - Fritz G Rathjen
- Max-Delbrück-Center for Molecular Medicine, DE-13092 Berlin, Germany
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