Current Molecular Imaging (Discontinued)

Abass Alavi
Department of Radiology/Nuclear Medicine
Hospital of the University of Pennsylvania
Philadelphia, PA 19104


Synthesis and Development of MSN-Gd3+-C595 as MR Imaging Contrast Agent for Prostate Cancer Cell Imaging

Author(s): Bita Mehravi, Mehdi Mirzaei, Mehdi S. Ardestani, Massoud Amanlou, Haleh Soltanghoraee, Negar Ghalandarlaki, Seyed Amir Mohsen Ziaee.


Purpose: Cell surface antigens as biomarkers suggest high potential for early diagnosis in cancers. The scope of this study is to synthesize Gd3+ based silica nanoparticles that conjugate on monoclonal antibody C595 by a facile method in order to detect human prostate cancer cells.

Method: In this study, monoclonal antibody C595, anti-MUC-1, was conjugated on Gd3+-based mesoporous silica nanospheres (MSN-Gd3+-C595) (71.1 nm) by utilizing N-5-Azido-2-nitrobenzoyloxy succinimide (ANB-NOS) cross linkers. This contrast agent was characterized using techniques such as nitrogen physisorption, thermogravimetric analysis, scanning and transmission electron microscopy, inductively coupled plasma atomic emission spectrometry (ICP-AES) and Dynamic Light Scattering (DLS). The relaxivities were determined using a 3 Tesla MRI scanner. The accurate and easily available in vitro assay based on MSN-Gd3+-C595 was applied to identify the cell surface antigen expression in the case of prostate cancer cells and the quantitative data were analyzed.

Results: Results showed that N-5-Azido-2-nitrobenzoyloxysuccinimide cross-linkers were suitable for conjugation of C595 on the surface of mesoporous silica nanospheres. Protein measurement assay indicated that 8% antibodies were attached on the surface of mesoporous silica nanospheres and TGA and ICP-AES results demonstrated that 19 wt% Gd3+-DTTA were loaded into C595-MSN-Gd3+. Furthermore, the obtained data showed a powerful relaxations as well as selective MUC-1 antigen binding to the cell.

Conclusion: Based on the results of the present study, MSN-Gd3+-C595 nanoprobe may be a potential prostate molecular imaging and may provide critical guideline in selecting these nanoparticles as an appropriate contrast agent for nanomedicine applications.

Keywords: Prostate cancer cells, gadolinium, Mab C595, mesoporous silica nanospheres, MRI.

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Article Details

Page: [43 - 51]
Pages: 9
DOI: 10.2174/2211555202666140109000743