Provided herein are compounds useful as imaging agents. Exemplary compounds provided herein are useful as myeloperoxidase imaging agents using magnetic resonance or nuclear imaging techniques. Methods for preparing the compounds provided herein and diagnostic methods using the compounds are also provided.

A method of diagnosing or monitoring a patient suffering from cancer, the method comprising: administering a pharmaceutical composition comprising an effective amount of an active agent, wherein the active agent is [1-.sup.13C] N-acetyl cysteine, a deuterated derivative thereof, a pharmaceutically acceptable salt of any of the foregoing thereof, or a combination thereof, together with a pharmaceutically acceptable carrier to the patient; and diagnosing or monitoring the patient by hyperpolarized .sup.13C-MRI. Also disclosed is a method of synthesizing [1-.sup.13C] N-acetyl cysteine or a deuterated derivative thereof.

A method of diagnosing or monitoring a patient suffering from cancer, the method comprising: administering a pharmaceutical composition comprising an effective amount of an active agent, wherein the active agent is [1-.sup.13C] N-acetyl cysteine, a deuterated derivative thereof, a pharmaceutically acceptable salt of any of the foregoing thereof, or a combination thereof, together with a pharmaceutically acceptable carrier to the patient; and diagnosing or monitoring the patient by hyperpolarized .sup.13C-MRI. Also disclosed is a method of synthesizing [1-.sup.13C] N-acetyl cysteine or a deuterated derivative thereof.

A method for preparing .sup.18F radiolabeled biomolecules and agents for .sup.18F-PET imaging is disclosed herein. A perfluoroaryl-conjugated target tracer is synthesized and purified with temperature and solvent conditions that are mild for the tracer molecule. The purified perfluoroaryl-conjugated target tracer is then labeled with .sup.18F using .sup.18F salts within a short reaction time, and with temperature and solvent conditions that are mild for the tracer molecule. The method provides a quick and convenient process that maintains the biological activities of the target molecules. The radio-labeled biomolecules may be used as contrast agents for Positron Emission Tomography (PET).

The present disclosure describes the use of 2,4-disulfonyl phenyl tert-butyl nitron (2,4-ds-PBN) in the treatment of temozolomide drug resistant gliomas. The 2,4-ds-PBN may be used combined with other chemo- and radiotherapies and surgery, including temozolomide, to reduce glioma occurrence, recurrence, spread, growth, metastasis, and vascularization, and to inhibit development of temozolomide resistance.

The present disclosure describes the use of 2,4-disulfonyl phenyl tert-butyl nitron (2,4-ds-PBN) in the treatment of temozolomide drug resistant gliomas. The 2,4-ds-PBN may be used combined with other chemo- and radiotherapies and surgery, including temozolomide, to reduce glioma occurrence, recurrence, spread, growth, metastasis, and vascularization, and to inhibit development of temozolomide resistance.

The present disclosure provides for a novel hypoxia-targeting contrast agent for noninvasive detection of hypoxia using magnetic resonance imaging. Also disclosed is a process of preparing the novel hypoxia-targeting contrast agent, as well as methods of using the novel hypoxia-targeting contrast agent.

The present disclosure provides for a novel hypoxia-targeting contrast agent for noninvasive detection of hypoxia using magnetic resonance imaging. Also disclosed is a process of preparing the novel hypoxia-targeting contrast agent, as well as methods of using the novel hypoxia-targeting contrast agent.

A rod-shaped plant virus having an interior surface and an exterior surface, and at least one imaging agent that is linked to the interior and/or exterior surface is described. The rod-shaped viruses can be combined into larger spherical nanoparticles. A rod-shaped plant virus or spherical nanoparticles including an imaging agent can be used in a method of generating an image of a tissue region of a subject such as a tumor or atherosclerotic tissue by administering the virus particle to the subject and generating an image of the tissue region of the subject to which the virus particle has been distributed.

An aqueous pharmaceutical composition including compound having the formula of tetragadolinium[4,10-bis(carboxylatomethyl)-7-{-3,6,12,15-tetraoxo-16-[4,7,10-tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]-9,9-bis({[({2-[4,7,10-tris(carboxylatomethyl)-1,4,7,10- tetraazacyclododecan-1-yl]propanoyl}amino)acetyl]amino}methyl)-4,7,11,14-tetraazaheptadecan-2-yl}-1,4,7,10-tetraazacyclododecan-1-yl]acetate wherein the stereochemistry at the chiral carbon of the four alanine substituents is selected from the group consisting of RRRR, SSSS, RSSS, RRSS, and RRRS stereoisomers, and racemic and diastereomeric mixtures of any thereof, or a tautomer, a hydrate, a solvate, or a salt thereof, or a mixture of same is described. The compounds may be used as an MRI contrast imaging agent.