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IgA nephropathy is the most common glomerular disease in the world and has become a serious threat to human health. Accurate and non-invasive molecular imaging to detect and recognize the IgA nephropathy is critical for the subsequent timely treatment; otherwise, it may progress to end-stage renal disease and lead to glomerular dysfunction. In this study, we have developed a sensitive, specific, and biocompatible integrin αvβ3-targeted superparamagnetic Fe 3 O 4  nanoparticles (NPs) for the noninvasive magnetic resonance imaging (MRI) of integrin αvβ3, which is overexpressed in glomerular mesangial region of IgA nephropathy. The rat model of IgA nephropathy was successfully established and verified by biochemical tests and histological staining. Meanwhile, the clinical  18 F-AlF-NOTA-PRGD2 probe molecule was utilized to visualize and further confirmed the IgA nephropathy  in vivo via  positron emission computed tomography. Subsequently, the Fe 3 O 4  NPs were conjugated with arginine–glycine–aspartic acid (RGD) molecules (Fe 3 O 4 -RGD), and their integrin αvβ3-targeted T2-weighted imaging (T2WI) potential has been carefully evaluated. The Fe 3 O 4 -RGD demonstrated great relaxation  in vivo . The T2WI signal of renal layers in the targeted group at 3 h after intravenous injection of Fe 3 O 4 -RGD was distinctly lower than baseline, indicating MRI signal decreased in the established IgA nephropathy rat model. Moreover, the TEM characterization and Prussian blue staining confirmed that the Fe 3 O 4 -RGD was located at the region of glomerulus and tubular interstitium. Moreover, no obvious signal decreased was detected in the untargeted Fe 3 O 4  treated and normal groups. Collectively, our results establish the possibility of Fe 3 O 4 -RGD serving as a feasible MRI agent for the noninvasive diagnosis of IgA nephropathy.

The Feasibility of Targeted Magnetic Iron Oxide Nanoagent for Noninvasive IgA Nephropathy Diagnosis