Abstract
The main use of glycopeptide antibiotics is treatment of infections which are resistant to the commonly used - lactam antibiotics. Antitumor activity has also been reported for some glycopeptide antibiotics like bleomycin. In the present study we investigated the chemotherapeutic and diagnostic potential of two imaging agent derivatives of the glycopeptide antibiotic vancomycin. For the first conjugate, vancomycin was coupled to the fluorescent dye rhodamine, used in confocal laser scanning microscopy (CLSM) and fluorescence-activated cell sorting (FACS). The second conjugate consisted of vancomycin coupled to gadolinium-1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid (GdDOTA), a magnetic resonance imaging (MRI) contrast agent. The cellular uptake, specificity, and the accessibility by imaging methods of the two vancomycin conjugates was evaluated on 8 human cell lines (one benign, 7 malignant) by CLSM, FACS, and MRI experiments. Cytotoxicity of both vancomycin conjugates was determined in the FACS experiments with the annexin test indicating disrupted cell membranes. Some of the malignant cell lines showed clearly stronger uptake than the others and the benign cell line was among the cell lines with the lowest uptake. In the annexin test the cytotoxicity could be correlated to the conjugate uptake for all cell lines. The intracellular uptake of the vancomycin conjugates and the increased uptake into some of the malignant cell lines were interesting findings which should be further pursued.
Keywords: Vancomycin conjugates, Magnetic resonance imaging, Fluorescence imaging
Medicinal Chemistry
Title:Evaluating the Diagnostic and Chemotherapeutic Potential of Vancomycin- Derived Imaging Conjugates
Volume: 8 Issue: 6
Author(s): Sumbla Sheikh, Alexander Sturzu, Uwe Klose, Hartmut Echner, Martin Deeg, Thomas Nagele, Marius Horger, Christian Schwentner, Ulrike Ernemann, Wolfgang Voelter and Stefan Heckl
Affiliation:
Keywords: Vancomycin conjugates, Magnetic resonance imaging, Fluorescence imaging
Abstract: The main use of glycopeptide antibiotics is treatment of infections which are resistant to the commonly used - lactam antibiotics. Antitumor activity has also been reported for some glycopeptide antibiotics like bleomycin. In the present study we investigated the chemotherapeutic and diagnostic potential of two imaging agent derivatives of the glycopeptide antibiotic vancomycin. For the first conjugate, vancomycin was coupled to the fluorescent dye rhodamine, used in confocal laser scanning microscopy (CLSM) and fluorescence-activated cell sorting (FACS). The second conjugate consisted of vancomycin coupled to gadolinium-1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid (GdDOTA), a magnetic resonance imaging (MRI) contrast agent. The cellular uptake, specificity, and the accessibility by imaging methods of the two vancomycin conjugates was evaluated on 8 human cell lines (one benign, 7 malignant) by CLSM, FACS, and MRI experiments. Cytotoxicity of both vancomycin conjugates was determined in the FACS experiments with the annexin test indicating disrupted cell membranes. Some of the malignant cell lines showed clearly stronger uptake than the others and the benign cell line was among the cell lines with the lowest uptake. In the annexin test the cytotoxicity could be correlated to the conjugate uptake for all cell lines. The intracellular uptake of the vancomycin conjugates and the increased uptake into some of the malignant cell lines were interesting findings which should be further pursued.
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Cite this article as:
Sheikh Sumbla, Sturzu Alexander, Klose Uwe, Echner Hartmut, Deeg Martin, Nagele Thomas, Horger Marius, Schwentner Christian, Ernemann Ulrike, Voelter Wolfgang and Heckl Stefan, Evaluating the Diagnostic and Chemotherapeutic Potential of Vancomycin- Derived Imaging Conjugates, Medicinal Chemistry 2012; 8 (6) . https://dx.doi.org/10.2174/1573406411208061163
DOI https://dx.doi.org/10.2174/1573406411208061163 |
Print ISSN 1573-4064 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6638 |
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