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Evaluating the Diagnostic and Chemotherapeutic Potential of Vancomycin-Derived Imaging Conjugates.
MedLine Citation:
PMID:  22741805     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The main use of glycopeptide antibiotics is treatment of infections which are resistant to the commonly used β-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.
Authors:
Sumbla Sheikh; Alexander Sturzu; Uwe Klose; Hartmut Echner; Martin Deeg; Thomas Nägele; Marius Horger; Christian Schwentner; Ulrike Ernemann; Wolfgang Voelter; Stefan Heckl
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-25
Journal Detail:
Title:  Medicinal chemistry (Shariqah (United Arab Emirates))     Volume:  -     ISSN:  1875-6638     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101240303     Medline TA:  Med Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Neuroradiology University of Tübingen Hoppe-Seyler-Str.3 72076 Tübingen sumblafarooq@yahoo.com.
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