The present disclosure relates to a heterochiral peptide complex, a self-assembled intermediate thereof, an alignment medium composition used for nuclear magnetic resonance spectroscopy residual dipolar coupling (NMR-RDC) measurement, which includes the same, and a method for NMR measurement for a biomolecule. Since the heterochiral peptide complex contains a β-sheet peptide and has superior structural stability against environmental factors such as heat, acidity and ionic strength, it is applicable as an alignment medium for measuring RDC for various biomolecules.

A liposomal composition (“ADx-001”) is provided, ADx-001 comprising a first phospholipid; a sterically bulky excipient that is capable of stabilizing the liposomal composition; a second phospholipid that is derivatized with a first polymer; a macrocyclic gadolinium-based imaging agent; and a third phospholipid that is derivatized with a second polymer, the second polymer being conjugated to a targeting ligand. The macrocyclic gadolinium-based imaging agent may be conjugated to a fourth phospholipid.

A liposomal composition (“ADx-003”) is provided, ADx-003 comprising a first phospholipid; a sterically bulky excipient that is capable of stabilizing the liposomal composition; a second phospholipid that is derivatized with a first polymer; a macrocyclic gadolinium-based imaging agent; and a third phospholipid that is derivatized with a second polymer, the second polymer being conjugated to a targeting ligand, the targeting ligand being represented by Formula I:

##STR00001##

wherein X is —CH.sub.2—, —CH.sub.2—CH.sub.2—, —CHO—, or —O—CO—; Y is —CH—CH═CH— or

##STR00002##

A and B are independently selected from C and N; R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from —H, halogen, —OH, and —CH.sub.3; and R.sub.5, R.sub.6, and R.sub.7 are independently selected from —H, halogen, —OH, —OCH.sub.3, —NO.sub.2, —N(CH.sub.3).sub.2, C.sub.1-C.sub.6 alkyl, or a substituted or unsubstituted C.sub.4-C.sub.6 aryl group, except that when A and/or B is N the adjacent R.sub.5 and/or R.sub.7 is —H, or a pharmaceutically acceptable salt thereof.

A liposomal composition (“ADx-003”) is provided, ADx-003 comprising a first phospholipid; a sterically bulky excipient that is capable of stabilizing the liposomal composition; a second phospholipid that is derivatized with a first polymer; a macrocyclic gadolinium-based imaging agent; and a third phospholipid that is derivatized with a second polymer, the second polymer being conjugated to a targeting ligand, the targeting ligand being represented by Formula I:

##STR00001##

wherein X is —CH.sub.2—, —CH.sub.2—CH.sub.2—, —CHO—, or —O—CO—; Y is —CH—CH═CH— or

##STR00002##

A and B are independently selected from C and N; R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from —H, halogen, —OH, and —CH.sub.3; and R.sub.5, R.sub.6, and R.sub.7 are independently selected from —H, halogen, —OH, —OCH.sub.3, —NO.sub.2, —N(CH.sub.3).sub.2, C.sub.1-C.sub.6 alkyl, or a substituted or unsubstituted C.sub.4-C.sub.6 aryl group, except that when A and/or B is N the adjacent R.sub.5 and/or R.sub.7 is —H, or a pharmaceutically acceptable salt thereof.

Provided herein is a compound useful as a magnetic resonance imaging (MRI) contrast agent and a therapeutic agent, said compound having a structure represented by: Y—X—Z wherein, X is Mn(II), and Y and Z are each independently a bisphosphonate coupled to one or more therapeutic agents. Methods of use of the compound for MRI imaging and treatment for cancer or a microbial infection are also provided.

An agent for use in detecting, monitoring, and/or imaging cancer cells and/or cancer cell metastasis, migration, dispersal, and/or invasion, and/or for treating cancer in a subject includes a targeting peptide and at least one of a detectable moiety, therapeutic agent, or a theranostic agent that is directly or indirectly linked to the targeting peptide. The targeting peptide specifically binds to and/or complexes with a proteolytically cleaved extracellular fragment of an immunoglobulin (Ig) superfamily cell adhesion molecule that is expressed by a cancer cell or another cell in the cancer cell microenvironment.

Methods and compositions for detecting tau pathology are described. The compositions for detecting tau pathology comprise a targeting ligand that specifically binds to a cell surface marker of tau pathology, wherein the targeting ligand is linked to a liposome that includes an imaging agent. The compositions can be used in a method for imaging tau pathology in a subject that comprises administering to the subject an effective amount of the composition to a subject and imaging at least a portion of the subject to determine if that portion of the subject exhibits tau pathology. The compositions can also be used to detect tau pathology in biological samples obtained from a subject.

A conjugate comprising FL-L-IA, wherein FL is a radical of a small molecule ligand that specifically binds with fibroblast activation protein (FAP), L is a linker, which binds an FL to IA, and IA is a radical of a magnetic resonance imaging (MRI) agent, or a pharmaceutically acceptable salt thereof; a composition comprising same; and a method of using the conjugate or composition to image cells, a tissue, or an organ that express(es) FAP with magnetic resonance imaging.

Various embodiments of the present invention are directed to polyrotaxanes comprising a poloxamer core and at least one cyclodextrin and methods for treating Niemann-Pick type C (NPC) and imaging (e.g., MRI) using the polyrotaxanes of the various embodiments of the present invention.

The present invention provides compositions and methods for targeting cells for therapeutic and/or diagnostic purposes, e.g., delivery of therapeutic and/or diagnostic agents to a cell. Nanoparticles and polymers functionalized with capture molecules, reporter molecules, and/or therapeutic agents are provided for the treatment or prevention of disease, including neurological diseases associated with neuroinflammation, and cancer.