The goal of this project is to develop bioactivated magnetic resonance(MR) contrast agents for the imaging of in vivo processes, ranging from gene expression to secondary messenger activation. This project is focused on obtaining insights into the interrelated problems of developmental biology and clinical diseases by i. generating MR probes that function as real-time in vivo enzyme reporters, ii. Track gene expression in whole animals and correlate this information with ongoing developmental events, and iii. develop biocompatible scaffolds for the efficient delivery of these agents in experimental animals and potentially humans. In order to maximize the impact of this technique, functional contrast agents must be investigated and developed. Further, the study of developmental biology in whole animals will result in a deeper understanding of the role of spatial organization with mechanism. Therefore, to create an in vivo assay of enzymatic activities and detection of secondary messengers, MR contrast agents will be designed and synthesized with removable protection groups that largely prevent the access of water to a paramagnetic center. By limiting the access of bulk water (q- modulation) the unprocessed agent is designed to be an ineffective contrast agent. We have defined 5 primary objectives: 1.Synthesize and characterize MRI contrast agents with enzyme substrates as blocking groups of water (q-modulation) 2. Use computational modeling to direct synthetic efforts towards new q-modulated agents. 3.Develop targeted contrast agents and methods of amplifying the contrast signal. 4. Investigate delivery and the uptake mechanisms by which the agents are internalized by cells. 5. Evaluate the effectiveness of the agents in preclinical rodent models and other in vivo systems. Several tetraazamacrocyclic architectures will be synthesized and investigated. We will focus on the schematically represented structures I- V where the arrows represent the site of enzymatic attack for the irreversibly activated agents (I-III).

Public Health Relevance

This project is relevant to public health because the results will directly impact current methods of diagnosis and treatment of clinical disease. The development of bioactivated contrast agents for tracking gene expression is a powerful tool for developmental biology which has wide-ranging applications in areas such as prevention of cancer metastasis.

National Institute of Health (NIH)
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Research Project (R01)
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Synthetic and Biological Chemistry A Study Section (SBCA)
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Zhang, Yantian
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Northwestern University at Chicago
Schools of Arts and Sciences
United States
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Rotz, Matthew W; Holbrook, Robert J; MacRenaris, Keith W et al. (2018) A Markedly Improved Synthetic Approach for the Preparation of Multifunctional Au-DNA Nanoparticle Conjugates Modified with Optical and MR Imaging Probes. Bioconjug Chem 29:3544-3549
Preslar, Adam T; Lilley, Laura M; Sato, Kohei et al. (2017) Calcium-Induced Morphological Transitions in Peptide Amphiphiles Detected by 19F-Magnetic Resonance Imaging. ACS Appl Mater Interfaces 9:39890-39894
Verma, Kirti Dhingra; Massing, Justin O; Kamper, Sarah G et al. (2017) Synthesis and evaluation of MR probes for targeted-reporter imaging. Chem Sci 8:5764-5768
Rammohan, Nikhil; Holbrook, Robert J; Rotz, Matthew W et al. (2017) Gd(III)-Gold Nanoconjugates Provide Remarkable Cell Labeling for High Field Magnetic Resonance Imaging. Bioconjug Chem 28:153-160
Hung, Andy H; Lilley, Laura M; Hu, Fengqin et al. (2017) Magnetic barcode imaging for contrast agents. Magn Reson Med 77:970-978
Vistain, Luke F; Rotz, Matthew W; Rathore, Richa et al. (2016) Targeted delivery of gold nanoparticle contrast agents for reporting gene detection by magnetic resonance imaging. Chem Commun (Camb) 52:160-3
Preslar, Adam T; Tantakitti, Faifan; Park, Kitae et al. (2016) (19)F Magnetic Resonance Imaging Signals from Peptide Amphiphile Nanostructures Are Strongly Affected by Their Shape. ACS Nano 10:7376-84
MacRenaris, Keith W; Ma, Zhidong; Krueger, Ruby L et al. (2016) Cell-Permeable Esterase-Activated Ca(II)-Sensitive MRI Contrast Agent. Bioconjug Chem 27:465-73
Rammohan, Nikhil; MacRenaris, Keith W; Moore, Laura K et al. (2016) Nanodiamond-Gadolinium(III) Aggregates for Tracking Cancer Growth In Vivo at High Field. Nano Lett 16:7551-7564
Carney, Christiane E; MacRenaris, Keith W; Meade, Thomas J (2015) Water-soluble lipophilic MR contrast agents for cell membrane labeling. J Biol Inorg Chem 20:971-7

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