A Standardized Method for In Vivo Mouse Pancreas Imaging and Semiquantitative β Cell Mass Measurement by Dual Isotope SPECT

Iris Mathijs, Catarina Xavier, Cindy Peleman, Vicky Caveliers, Maarten Brom, Martin Gotthardt, Pedro Luis Herrera, Tony Lahoutte, Luc Bouwens

Onderzoeksoutput: Articlepeer review

Samenvatting

PURPOSE:
In order to evaluate future beta cell tracers in vivo, we aimed to develop a standardized in vivo method allowing semiquantitative measurement of a prospective beta cell tracer within the pancreas.
PROCEDURES:
2-[123I]Iodo-L-phenylalanine ([123I]IPA) and [Lys40([111In]DTPA)]exendin-3 ([111In]Ex3) pancreatic uptake and biodistribution were evaluated using SPECT, autoradiography, and an ex vivo biodistribution study in a controlled unilaterally nephrectomized mouse ? cell depletion model. Semiquantitative measurement of the imaging results was performed using [123I]IPA to delineate the pancreas and [111In]Ex3 as a beta cell tracer.
RESULTS:
The uptake of [123I]IPA was highest in the pancreas. Aside from the kidneys, the uptake of [111In]Ex3 was highest in the pancreas and lungs. Autoradiography showed only uptake of [111In]Ex3 in insulin-expressing cells. Semiquantitative measurement of [111In]Ex3 in the SPECT images based on the delineation of the pancreas with [123I]IPA showed a high correlation with the [111In]Ex3 uptake data of the pancreas obtained by dissection. A strong positive correlation was observed between the relative insulin positive area and the pancreas-to-blood ratios of [111In]Ex3 uptake as determined by counting with a gamma counter and the semiquantitative analysis of the SPECT images.
CONCLUSIONS:
[123I]IPA is a promising tracer to delineate pancreatic tissue on SPECT images. It shows a high uptake in the pancreas as compared to other abdominal tissues. This study also demonstrates the feasibility and accuracy to measure the beta cell mass in vivo in an animal model of diabetes.
Originele taal-2English
Pagina's (van-tot)58-66
Aantal pagina's9
TijdschriftMolecular Imaging and Biology
Volume17
Nummer van het tijdschrift1
StatusPublished - 2015

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