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Golusda L, Kühl AA, Lehmann M, Dahlke K, Mueller S, Boehm-Sturm P, Saatz J, Traub H, Schnorr J, Freise C, Taupitz M, Biskup K, Blanchard V, Klein O, Sack I, Siegmund B, Paclik D. Visualization of Inflammation in Experimental Colitis by Magnetic Resonance Imaging Using Very Small Superparamagnetic Iron Oxide Particles. Front Physiol 2022; 13:862212. [PMID: 35903065 PMCID: PMC9315402 DOI: 10.3389/fphys.2022.862212] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/16/2022] [Indexed: 11/13/2022] Open
Abstract
Inflammatory bowel diseases (IBD) comprise mainly ulcerative colitis (UC) and Crohn´s disease (CD). Both forms present with a chronic inflammation of the (gastro) intestinal tract, which induces excessive changes in the composition of the associated extracellular matrix (ECM). In UC, the inflammation is limited to the colon, whereas it can occur throughout the entire gastrointestinal tract in CD. Tools for early diagnosis of IBD are still very limited and highly invasive and measures for standardized evaluation of structural changes are scarce. To investigate an efficient non-invasive way of diagnosing intestinal inflammation and early changes of the ECM, very small superparamagnetic iron oxide nanoparticles (VSOPs) in magnetic resonance imaging (MRI) were applied in two mouse models of experimental colitis: the dextran sulfate sodium (DSS)-induced colitis and the transfer model of colitis. For further validation of ECM changes and inflammation, tissue sections were analyzed by immunohistochemistry. For in depth ex-vivo investigation of VSOPs localization within the tissue, Europium-doped VSOPs served to visualize the contrast agent by imaging mass cytometry (IMC). VSOPs accumulation in the inflamed colon wall of DSS-induced colitis mice was visualized in T2* weighted MRI scans. Components of the ECM, especially the hyaluronic acid content, were found to influence VSOPs binding. Using IMC, co-localization of VSOPs with macrophages and endothelial cells in colon tissue was shown. In contrast to the DSS model, colonic inflammation could not be visualized with VSOP-enhanced MRI in transfer colitis. VSOPs present a potential contrast agent for contrast-enhanced MRI to detect intestinal inflammation in mice at an early stage and in a less invasive manner depending on hyaluronic acid content.
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Affiliation(s)
- Laura Golusda
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- iPATH.Berlin, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Department of Biology, Chemistry and Pharmacy, Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Anja A. Kühl
- iPATH.Berlin, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Malte Lehmann
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Katja Dahlke
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- iPATH.Berlin, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Susanne Mueller
- Department of Experimental Neurology and Center for Stroke Research, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- NeuroCure Cluster of Excellence and Charité Core Facility 7T Experimental MRIs, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Philipp Boehm-Sturm
- Department of Experimental Neurology and Center for Stroke Research, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- NeuroCure Cluster of Excellence and Charité Core Facility 7T Experimental MRIs, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Jessica Saatz
- Bundesanstalt für Materialforschung und-prüfung (BAM), Division Inorganic Trace Analysis, Berlin, Germany
| | - Heike Traub
- Bundesanstalt für Materialforschung und-prüfung (BAM), Division Inorganic Trace Analysis, Berlin, Germany
| | - Joerg Schnorr
- Department of Radiology-Experimental Radiology, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Christian Freise
- Department of Radiology-Experimental Radiology, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Matthias Taupitz
- Department of Radiology-Experimental Radiology, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Karina Biskup
- Campus Virchow-Klinikum, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Véronique Blanchard
- Campus Virchow-Klinikum, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Oliver Klein
- BIH-Center for Regenerative Therapies, Campus Virchow-Klinikum, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Ingolf Sack
- Department of Radiology-Experimental Radiology, Campus Mitte, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Britta Siegmund
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Daniela Paclik
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- iPATH.Berlin, Campus Benjamin Franklin, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- *Correspondence: Daniela Paclik,
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Li T, Hui H, Hu C, Ma H, Yang X, Tian J. Multiscale imaging of colitis in mice using confocal laser endomicroscopy, light-sheet fluorescence microscopy, and magnetic resonance imaging. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-8. [PMID: 30701723 PMCID: PMC6985686 DOI: 10.1117/1.jbo.24.1.016003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 01/15/2019] [Indexed: 06/09/2023]
Abstract
The objective of our study is to develop a multimodality approach by combining magnetic resonance imaging (MRI) and optical imaging methods to assess acute murine colitis at the macro- and microscopic level. In vivo MRI is used to measure the cross-sectional areas of colons at the macroscopic level. Dual-color confocal laser endomicroscopy (CLE) allows in vivo examination of the fluorescently labeled epithelial cells and microvessels in the mucosa with a spatial resolution of ∼1.4 μm during ongoing endoscopy. To further validate the structural changes of the colons in three-dimensions, ex vivo light-sheet fluorescence microscopy (LSFM) is applied for in-toto imaging of cleared colon sections. MRI, LSFM, and CLE findings are significantly correlated with histological scoring (p < 0.01) and the inflammation-associated activity index (p < 0.01). Our multimodality imaging technique permits visualization of mucosa in colitis at different scales, which can enhance our understanding of the pathogenesis of inflammatory bowel diseases.
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Affiliation(s)
- Tianmeng Li
- Northeastern University, Sino-Dutch Biomedical and Information Engineering School, Shenyang, China
- Chinese Academy of Sciences, Institute of Automation, CAS Key Laboratory of Molecular Imaging, Beijing, China
- Institute of Automation, Beijing Key Laboratory of Molecular Imaging, Beijing, China
| | - Hui Hui
- Chinese Academy of Sciences, Institute of Automation, CAS Key Laboratory of Molecular Imaging, Beijing, China
- Institute of Automation, Beijing Key Laboratory of Molecular Imaging, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Chaoen Hu
- Chinese Academy of Sciences, Institute of Automation, CAS Key Laboratory of Molecular Imaging, Beijing, China
- Institute of Automation, Beijing Key Laboratory of Molecular Imaging, Beijing, China
| | - He Ma
- Northeastern University, Sino-Dutch Biomedical and Information Engineering School, Shenyang, China
| | - Xin Yang
- Chinese Academy of Sciences, Institute of Automation, CAS Key Laboratory of Molecular Imaging, Beijing, China
- Institute of Automation, Beijing Key Laboratory of Molecular Imaging, Beijing, China
| | - Jie Tian
- Chinese Academy of Sciences, Institute of Automation, CAS Key Laboratory of Molecular Imaging, Beijing, China
- Institute of Automation, Beijing Key Laboratory of Molecular Imaging, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
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Jung D, Heiss R, Kramer V, Thoma OM, Regensburger AP, Rascher W, Uder M, Neurath MF, Knieling F, Waldner MJ. Contrast-Enhanced µCT for Visualizing and Evaluating Murine Intestinal Inflammation. Am J Cancer Res 2018; 8:6357-6366. [PMID: 30613304 PMCID: PMC6299705 DOI: 10.7150/thno.26013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 10/14/2018] [Indexed: 12/11/2022] Open
Abstract
Rationale: To develop a simple and fast protocol for the assessment of acute and chronic experimental intestinal inflammation using contrast-enhanced µCT. Methods: For the imaging studies, an acute 2% and 3% dextran sodium sulfate (n = 15, female, 8-12 weeks) and a chronic adoptive transfer colitis model (n = 10, female, 8-9 weeks) were established over 9 days or 6 weeks, respectively. Throughout the experiments, longitudinal measurement of murine intestinal wall thickness and time dependent perfusion was performed on a small animal µCT system (90 kV, 160 μA, FOV: 60 mm, scan time: 17 s, image size: 512x512, layer thickness: 118 µm) between 0.5 and 30 min after intravenous bolus injection of an iodine contrast agent. Weight development, small animal endoscopy, and histological ex vivo analysis were compared to contrast-enhanced µCT imaging findings. Results: Murine intestinal wall thickness was significantly increased in inflamed colons of acute colitis at day 9 in comparison to pre-inflamed state. Perfusion analysis revealed a late contrast enhancement in acute inflamed colons and the renal medulla at day 9 compared to control mice. An increasing intestinal wall thickness was monitored 3, 5 and 6 weeks after on-set of chronic colitis in comparison to controls. A good correlation with endoscopic (r = 0.75, p < 0.0001) and histologic degree of inflammation (r = 0.83, p = 0.04) was found. Conclusion: Contrast-enhanced µCT is a simple and fast method to assess acute intestinal inflammation and to monitor disease progression in experimental models of chronic colitis. According to our findings, one single contrast-enhanced µCT-scan is a valid non-invasive modality to quantify the degree of inflammation in the entire digestive tract in murine inflammatory models.
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Ellmann S, Langer V, Britzen-Laurent N, Hildner K, Huber C, Tripal P, Seyler L, Waldner M, Uder M, Stürzl M, Bäuerle T. Application of machine learning algorithms for multiparametric MRI-based evaluation of murine colitis. PLoS One 2018; 13:e0206576. [PMID: 30365545 PMCID: PMC6203400 DOI: 10.1371/journal.pone.0206576] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 10/16/2018] [Indexed: 01/15/2023] Open
Abstract
Magnetic resonance imaging (MRI) allows non-invasive evaluation of inflammatory bowel disease (IBD) by assessing pathologically altered gut. Besides morphological changes, relaxation times and diffusion capacity of involved bowel segments can be obtained by MRI. The aim of this study was to assess the use of multiparametric MRI in the diagnosis of experimentally induced colitis in mice, and evaluate the diagnostic benefit of parameter combinations using machine learning. This study relied on colitis induction by Dextran Sodium Sulfate (DSS) and investigated the colon of mice in vivo as well as ex vivo. Receiver Operating Characteristics were used to calculate sensitivity, specificity, positive- and negative-predictive values (PPV and NPV) of these single values in detecting DSS-treatment as a reference condition. A Model Averaged Neural Network (avNNet) was trained on the multiparametric combination of the measured values, and its predictive capacity was compared to those of the single parameters using exact binomial tests. Within the in vivo subgroup (n = 19), the avNNet featured a sensitivity of 91.3% (95% CI: 86.6–96.0%), specificity of 92.3% (95% CI: 85.1–99.6%), PPV of 96.9% (94.0–99.9%) and NPV of 80.0% (95% CI: 69.9–90.1%), significantly outperforming all single parameters in at least 2 accuracy measures (p < 0.003) and performing significantly worse compared to none of the single values. Within the ex vivo subgroup (n = 30), the avNNet featured a sensitivity of 87.4% (95% CI: 82.6–92.2%), specificity of 82.9% (95% CI: 76.1–89.7%), PPV of 88.9% (84.3–93.5%) and NPV of 80.8% (95% CI: 73.8–87.9%), significantly outperforming all single parameters in at least 2 accuracy measures (p < 0.015), exceeded by none of the single parameters. In experimental mouse colitis, multiparametric MRI and the combination of several single measured values to an avNNet can significantly increase diagnostic accuracy compared to the single parameters alone. This pilot study will provide new avenues for the development of an MR-derived colitis score for optimized diagnosis and surveillance of inflammatory bowel disease.
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Affiliation(s)
- Stephan Ellmann
- Institute of Radiology, University Hospital Erlangen, Maximiliansplatz 1, Erlangen, Germany
- * E-mail:
| | - Victoria Langer
- Division of Molecular and Experimental Surgery, Translational Research Center Erlangen, Department of Surgery, Erlangen, Germany
| | - Nathalie Britzen-Laurent
- Division of Molecular and Experimental Surgery, Translational Research Center Erlangen, Department of Surgery, Erlangen, Germany
| | - Kai Hildner
- Department of Medicine 1, University Hospital Erlangen, Kussmaul Campus for Medical Research, Erlangen, Germany
| | - Carina Huber
- Department of Medicine 1, University Hospital Erlangen, Kussmaul Campus for Medical Research, Erlangen, Germany
| | - Philipp Tripal
- Optical Imaging Center Erlangen (OICE), Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Erlangen, Germany
| | - Lisa Seyler
- Institute of Radiology, University Hospital Erlangen, Maximiliansplatz 1, Erlangen, Germany
| | - Maximilian Waldner
- Department of Medicine 1, University Hospital Erlangen, Kussmaul Campus for Medical Research, Erlangen, Germany
| | - Michael Uder
- Institute of Radiology, University Hospital Erlangen, Maximiliansplatz 1, Erlangen, Germany
| | - Michael Stürzl
- Division of Molecular and Experimental Surgery, Translational Research Center Erlangen, Department of Surgery, Erlangen, Germany
| | - Tobias Bäuerle
- Institute of Radiology, University Hospital Erlangen, Maximiliansplatz 1, Erlangen, Germany
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Zappa M, Doblas S, Cazals-Hatem D, Milliat F, Lavigne J, Daniel F, Jallane A, Garteiser P, Vilgrain V, Ogier-Denis E, Van Beers BE. Quantitative MRI in murine radiation-induced rectocolitis: comparison with histopathological inflammation score. NMR IN BIOMEDICINE 2018; 31:e3897. [PMID: 29405471 DOI: 10.1002/nbm.3897] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 12/17/2017] [Accepted: 12/26/2017] [Indexed: 06/07/2023]
Abstract
Murine radiation-induced rectocolitis is considered to be a relevant animal model of gastrointestinal inflammation. The purpose of our study was to compare quantitative MRI and histopathological features in this gastrointestinal inflammation model. Radiation rectocolitis was induced by localized single-dose radiation (27 Gy) in Sprague-Dawley rats. T2 -weighted, T1 -weighted and diffusion-weighted MRI was performed at 7 T in 16 rats between 2 and 4 weeks after irradiation and in 10 control rats. Rats were sacrificed and the histopathological inflammation score of the colorectal samples was assessed. The irradiated rats showed significant increase in colorectal wall thickness (2.1 ± 0.3 mm versus 0.8 ± 0.3 mm in control rats, P < 0.0001), normalized T2 signal intensity (4 ± 0.8 versus 2 ± 0.4 AU, P < 0.0001), normalized T1 signal intensity (1.4 ± 0.1 versus 1.1 ± 0.2 AU, P = 0.0009) and apparent and pure diffusion coefficients (ADC and D) (2.06 × 10-3 ± 0.34 versus 1.51 × 10-3 ± 0.23 mm2 /s, P = 0.0004, and 1.97 × 10-3 ± 0.43 mm2 /s versus 1.48 × 10-3 ± 0.29 mm2 /s, P = 0.008, respectively). Colorectal wall thickness (r = 0.84, P < 0.0001), normalized T2 signal intensity (r = 0.85, P < 0.0001) and ADC (r = 0.80, P < 0.0001) were strongly correlated with the histopathological inflammation score, whereas normalized T1 signal intensity and D were moderately correlated (r = 0.64, P = 0.0006, and r = 0.65, P = 0.0003, respectively). High-field MRI features of single-dose radiation-induced rectocolitis in rats differ significantly from those of control rats. Quantitative MRI characteristics, especially wall thickness, normalized T2 signal intensity, ADC and D, are potential markers of the histopathological inflammation score.
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Affiliation(s)
- Magaly Zappa
- Hôpitaux Universitaires Beaujon, Radiology, Université Paris VII, Clichy, France
- Laboratory of Imaging Biomarkers, Center of Research on Inflammation, UMR 1149, INSERM, University Paris-Diderot, Paris, France
| | - Sabrina Doblas
- Laboratory of Imaging Biomarkers, Center of Research on Inflammation, UMR 1149, INSERM, University Paris-Diderot, Paris, France
| | - Dominique Cazals-Hatem
- Hopital Beaujon, Pathology, Université Paris VII, Clichy, France
- Laboratory of Intestinal Inflammation, Center of Research on Inflammation, UMR 1149, INSERM, University Paris Diderot, Paris, France
| | - Fabien Milliat
- Institute for Radiological Protection and Nuclear Safety (IRSN), Research Laboratory in Radiobiology and Radiopathology, Fontenay-aux-Roses, France
| | - Jérémy Lavigne
- Institute for Radiological Protection and Nuclear Safety (IRSN), Research Laboratory in Radiobiology and Radiopathology, Fontenay-aux-Roses, France
| | - Fanny Daniel
- Laboratory of Intestinal Inflammation, Center of Research on Inflammation, UMR 1149, INSERM, University Paris Diderot, Paris, France
| | - Abelhak Jallane
- Laboratory of Intestinal Inflammation, Center of Research on Inflammation, UMR 1149, INSERM, University Paris Diderot, Paris, France
| | - Philippe Garteiser
- Laboratory of Imaging Biomarkers, Center of Research on Inflammation, UMR 1149, INSERM, University Paris-Diderot, Paris, France
| | - Valérie Vilgrain
- Hôpitaux Universitaires Beaujon, Radiology, Université Paris VII, Clichy, France
- Laboratory of Imaging Biomarkers, Center of Research on Inflammation, UMR 1149, INSERM, University Paris-Diderot, Paris, France
| | - Eric Ogier-Denis
- Laboratory of Intestinal Inflammation, Center of Research on Inflammation, UMR 1149, INSERM, University Paris Diderot, Paris, France
| | - Bernard E Van Beers
- Hôpitaux Universitaires Beaujon, Radiology, Université Paris VII, Clichy, France
- Laboratory of Imaging Biomarkers, Center of Research on Inflammation, UMR 1149, INSERM, University Paris-Diderot, Paris, France
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Mouse models of inflammatory bowel disease for investigating mucosal immunity in the intestine. Curr Opin Gastroenterol 2017; 33:411-416. [PMID: 28901966 DOI: 10.1097/mog.0000000000000402] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Currently several mouse models are considered representative of inflammatory bowel disease (IBD). This review presents recent developments regarding the role of animal models of intestinal inflammation as research tools in IBD. RECENT FINDINGS Preclinical studies in animal models of intestinal inflammation have generated novel findings in several areas of IBD research. The combination of chemical and genetically engineered models have revealed protective or harmful roles for various components of the innate immune system in response to acute injury and repair mechanisms for the intestinal mucosa. Advances in the use of endoscopic and radiologic techniques have allowed identification of inflammatory biomarkers and in-vivo monitoring of cell trafficking towards inflammatory sites. Translational research has shed light on pathogenic mechanisms through which recent biological treatments may exert their beneficial effects in patients with IBD. Finally, novel therapies are continuously tested in animal models of IBD as part of preclinical drug development programs. SUMMARY Animal models of intestinal inflammation continue to be important research tools with high significance for understanding the pathogenesis of IBD and exploring novel therapeutic options. Development of additional experimental models that address existing limitations, and more closely resemble the characteristics of Crohn's disease and ulcerative colitis are greatly needed.
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Zeng M, Shao A, Li H, Tang Y, Li Q, Guo Z, Wu C, Cheng Y, Tian H, Zhu WH. Peptide Receptor-Targeted Fluorescent Probe: Visualization and Discrimination between Chronic and Acute Ulcerative Colitis. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13029-13036. [PMID: 28349696 DOI: 10.1021/acsami.7b00936] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The inflammatory activity of ulcerative colitis plays an important role in the medical treatment. However, accurate and real-time monitoring of the colitis activity with noninvasive bioimaging method is still challenging, especially in distinguishing between chronic and acute colitis. As a good receptor, the oligopeptide transporter (PepT1) is overexpressed in the colonic epithelial cells of chronic ulcerative colitis, which can deliver tripeptide KPV (Lys-Pro-Val, the C-terminal sequence of α-MSH) into cytosol in the intestine. Herein, we report a PepT1 peptide receptor-targeted fluorescent probe, dicyanomethylene-4H-pyran (DCM)-KPV, with the strategy of conjugating the KPV into the DCM chromophore. The diagnostic fluorescent probe bestows a specific receptor-targeted interaction with PepT1 through the KPV moiety, possessing several beneficial characteristics, such as efficient long emission, low photobleaching, negligible cytotoxicity, and high cytocompatibility in living cells. We build the overexpressed PepT1 on the cytomembrane of ulcerative colitis model Caco-2 cell as the efficient receptor to accumulate the targeted tripeptide KPV in the cytoplasm and nucleus. With the co-localization of DCM-KPV and the DNA-specific fluorophore, DAPI, the specifically long emission from chromophore DCM and efficient receptor-targeted peptide KPV, the fluorescent probe of DCM-KPV makes a breakthrough to the direct noninvasive observation of the accumulation in colon inflammation regions via intestinal mucosa, even successfully distinguishing the chronic, acute ulcerative colitis and normal groups. Compared with the traditional unenhanced magnetic resonance imaging and hematoxylin and eosin (H&E) staining, we make full use of exploiting the specific target-receptor interaction between the tripeptide unit, KPV, and the oligopeptide transporter, PepT1, for sensing selectivity. The desirable diagnostic ability of DCM-KPV can guarantee the real-time tracking and visualization of the role of intracellular KPV on ulcerative colitis, which provides an alternative to replace the time-consuming and tissue sampling-invasive H&E staining diagnosis.
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Affiliation(s)
- Meiying Zeng
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , 600 Yishan Road, Shanghai 200233, China
| | - Andong Shao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
| | - Hui Li
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , 600 Yishan Road, Shanghai 200233, China
| | - Yan Tang
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , 600 Yishan Road, Shanghai 200233, China
| | - Qiang Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
| | - Zhiqian Guo
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
| | - Chungen Wu
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , 600 Yishan Road, Shanghai 200233, China
| | - Yingsheng Cheng
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , 600 Yishan Road, Shanghai 200233, China
| | - He Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
| | - Wei-Hong Zhu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
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