Nanoprobes for Multimodal Visualization of Bone Mineral Phase in Magnetic Resonance and Near-Infrared Optical Imaging

ACS Omega
Pradeep P WyssV Prasad Shastri

Abstract

Imaging agents with affinity for bone can enable early detection of changes to bone mineral density, which is a hallmark of many bone-associated pathologies such as Paget's disease and osteoporosis. Here, we report the development of a polymer nanoparticle (NP)-based multimodal imaging probe that enables visualization of bone mineral phase in near-infrared (NIR) optical tomography and detection in T2-weighted magnetic resonance imaging (MRI). Ultrasmall superparamagnetic iron oxide was first encapsulated in NPs derived by blending poly(dl-lactic-co-glycolic acid)-poly(ethylene glycol) (PLGA-PEG) with N-hydroxysuccinimide functionalized-PLGA (NHS-PLGA). Postmodification of NHS surface functionality on the NPs with alendronic acid (Aln), a bone-targeting ligand, yielded stable ultrasmall superparamagnetic iron oxide nanoparticles (USPIONs) containing NPs that exhibit good serum stability and favorable cytocompatibility. These post-Aln-modified NPs exhibit 8- to 10-fold higher affinity for synthetic and biogenic hydroxyapatite in comparison to NPs where Aln was introduced before NP formation and shorten the T2 relaxation times in both agarose phantoms and fresh spongy bone, thus enabling the interrogation of bone mineral phase in ...Continue Reading

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Citations

May 15, 2018·ACS Applied Materials & Interfaces·Fatemeh OstadhosseinDipanjan Pan
Aug 31, 2021·Current Opinion in Biomedical Engineering·Marian A Ackun-FarmmerDanielle S W Benoit

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BETA
nanoprecipitation
transmission electron microscopy
NMR
nuclear magnetic resonance
X-ray
Infrared Spectroscopy
dynamic light scattering
PCR

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