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Noninvasive Diagnosis of Kidney Dysfunction Using a Small-Molecule Manganese-Based Magnetic Resonance Imaging Probe
Yuping Zhang1, Ke Xiang1, Jinbin Pan2
1School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China.
Analytical Chemistry
|February 14, 2024
Summary
A novel manganese-based imaging probe, Mn-PhDTA, offers a safer alternative to gadolinium-based contrast agents for kidney disease diagnosis. This new agent effectively assesses renal insufficiency and monitors kidney disease progression.
Area of Science:
- Medical Imaging
- Nanomedicine
- Chemistry
Background:
- Contrast-enhanced magnetic resonance imaging (CE-MRI) aids kidney disease diagnosis.
- Gadolinium-based contrast agents (GBCAs) pose safety risks, especially in renal impairment.
- Nanomaterials raise biosafety concerns due to potential long-term body retention.
Purpose of the Study:
- To introduce Mn-PhDTA, a small-molecule manganese-based probe, as a novel alternative to GBCAs for assessing renal insufficiency.
- To evaluate the synthesis, properties, stability, biocompatibility, and in vivo performance of Mn-PhDTA.
Main Methods:
- Mn-PhDTA was synthesized through a three-step reaction.
- Relaxivity (r1) and kinetic inertness were measured.
- In vitro and in vivo studies were conducted, including unilateral ureteral obstruction rat models.
Main Results:
- Mn-PhDTA demonstrated a high r1 relaxivity (2.72 mM-1 s-1 at 3.0 T) and superior kinetic inertness compared to Gd-DTPA and Mn-EDTA.
- The probe exhibited good stability and biocompatibility.
- In vivo MRI showed significant signal enhancement, enabling visualization of structural changes and functional evaluation in damaged kidneys.
Conclusions:
- Mn-PhDTA is a promising MRI contrast agent candidate for replacing GBCAs.
- It shows potential for early detection of kidney dysfunction and monitoring kidney disease progression.
- This manganese-based probe offers a safer imaging solution for patients with renal impairment.
