Initial assessment of magnetoferritin biokinetics and proton relaxation enhancement in rats

Academic Radiology
Jeff W M BulteJ A Frank

Abstract

We evaluated the biokinetics and proton relaxation enhancement of magnetoferritin, a recently developed class of superparamagnetic iron oxides, in rats. "Equine" magnetoferritin was administered intravenously at 5 mg protein and 1.4 mg Fe/kg in nude rats carrying subcutaneous xenografted human small-cell lung carcinoma with and without preinjection of 100 mg/kg equine apoferritin. Blood clearance, in vivo biodistribution, and proton relaxation enhancement were assessed by variable field relaxometry, immunohistochemistry, and magnetic resonance (MR) imaging at 1.5 T. Magnetoferritin clearance from blood followed biexponential kinetics, with a short initial half-life of 1.4-1.7 min. A second, longer component lasted for several hours. Histochemical staining, MR imaging, and ex vivo relaxometry revealed rapid uptake of magnetoferritin in the liver, spleen, and lymph nodes. There was no difference in biodistribution after apoferritin preinjection. In the rat, equine magnetoferritin is rapidly sequestered by cells of the reticuloendothelial system, with no direct involvement of ferritin receptors. These properties may allow the use of magnetoferritin as an MR contrast agent for the liver and spleen.

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Citations

Mar 17, 1999·Journal of Magnetic Resonance Imaging : JMRI·J W BulteJ A Frank
Sep 12, 2013·Pediatric Nephrology : Journal of the International Pediatric Nephrology Association·John F BertramKevin M Bennett
Nov 12, 2013·Advances in Chronic Kidney Disease·Jennifer R CharltonKevin M Bennett
Jul 22, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jason ColombKevin M Bennett
May 10, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Scott C BeemanKevin M Bennett
Apr 26, 2014·Contrast Media & Molecular Imaging·M Veronica Clavijo JordanKevin M Bennett
Aug 3, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Veronica Clavijo JordanKevin M Bennett
Feb 8, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Scott C BeemanKevin M Bennett
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