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MR imaging of murine arthritis using ultrasmall superparamagnetic iron oxide particles
B J Dardzinski1, V J Schmithorst, S K Holland
1Department of Radiology, Imaging Research Center, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA. bjd@athena.chmcc.org
Abstract:
The objective of this work was to determine the ability of magnetic resonance (MR) imaging with ultrasmall superparamagnetic iron oxide (USPIO) particles to provide quantitative measures of inflammation in autoimmune arthritis. Mice were injected intravenously or intra-articularly with USPIO followed by magnetic resonance and histological assessment of the knee joint. Comparisons were made between MR microimages and histology in naïve mice and mice with collagen-induced arthritis.Following intravenous administration, accumulation of USPIO was observed in the popliteal lymph nodes, but not the joint. Administration of USPIO intra-articularly resulted in signal loss in the joint. The MR signal intensity could be quantified and correlated with iron staining in the synovial lining. A marked increase in USPIO uptake and a corresponding decrease in signal intensity were observed in arthritic, compared to naïve mice. Areas of focal signal loss corresponded to foci of iron staining by histology. These studies may provide a basis for the clinical application of USPIO in arthritis for assessing disease severity and monitoring response to therapy.
Insights
Magnetic resonance imaging using ultrasmall superparamagnetic iron oxide (USPIO) particles can quantify inflammation in autoimmune arthritis. This technique shows promise for assessing disease severity and monitoring treatment response in patients.
Area of Science:
- Biomedical Imaging
- Immunology
- Materials Science
Background:
- Autoimmune arthritis involves joint inflammation.
- Accurate assessment of inflammation is crucial for effective treatment.
- Current imaging methods may lack quantitative precision for inflammation.
Purpose of the Study:
- To evaluate magnetic resonance (MR) imaging with ultrasmall superparamagnetic iron oxide (USPIO) particles for quantitative inflammation assessment in autoimmune arthritis.
- To correlate MR imaging findings with histological data.
- To explore the potential of USPIO-enhanced MR imaging for clinical applications in arthritis.
Main Methods:
- Mice with collagen-induced arthritis were injected with USPIO particles intravenously or intra-articularly.
- Knee joints were assessed using high-resolution MR imaging and histology.
- MR signal intensity was quantified and compared between arthritic and naive mice.
Main Results:
- Intra-articular USPIO administration led to signal loss in the joint, correlating with iron staining.
- Arthritic mice showed increased USPIO uptake and decreased MR signal intensity compared to naive mice.
- Focal MR signal loss corresponded to histological evidence of inflammation.
Conclusions:
- USPIO-enhanced MR imaging provides quantitative measures of inflammation in experimental arthritis.
- This technique can differentiate between arthritic and healthy joints.
- USPIO-based MR imaging holds potential for clinical use in arthritis diagnosis and therapy monitoring.
