Islet Transplantation Imaging in vivo

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Endocrinology

Background:

• Islet transplantation is vital for diabetes treatment but suffers early graft loss from inflammation, rejection, and immunosuppression toxicity.
• Early monitoring of transplanted islet viability and function is critical for timely intervention and treatment success.

Purpose of the Study:

• To review advancements in non-invasive in vivo imaging techniques for monitoring transplanted islets.
• To discuss contrast agents and molecular imaging methods for tracing and functional evaluation of islet grafts.

Main Methods:

• Review of contrast agents for Magnetic Resonance Imaging (MRI), Single-Photon Emission Computed Tomography/Positron Emission Tomography (SPECT/PET), Bioluminescence/Fluorescence Imaging (BLI/FI), Ultrasound (US), Magnetic Particle Imaging (MPI), Photoacoustic Imaging (PAI), and multimodal imaging.
• Summary of advantages and limitations of various molecular imaging modalities.

Main Results:

• Significant progress has been made in non-invasive in vivo islet transplantation imaging.
• Current imaging techniques allow for tracing and functional evaluation of transplanted islets.
• Most studies are limited to animal models, with long-term toxicity and stability requiring further evaluation.

Conclusions:

• Non-invasive imaging holds promise for monitoring islet transplantation, but clinical translation requires substantial further effort.
• Continued research into contrast agents and imaging modalities is essential for improving clinical applicability.