Title
Measurement of porto-systemic shunting in mice by novel three-dimensional micro-single photon emission computed tomography imaging enabling longitudinal follow-up
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Copenhagen ,
Subject
Human medicine
Source (journal)
Liver international. - Copenhagen
Volume/pages
30(2010) :8 , p. 1211-1220
ISSN
1478-3223
0106-9543
ISI
000280666800019
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Background and aims: The reference method for diagnosing porto-systemic shunting (PSS) in experimental portal hypertension involves measuring 51Chrome (51Cr)-labelled microspheres. Unfortunately, this technique necessitates the sacrifice of animals. Alternatively, 99mtechnetium-macroaggregated albumin (99mTc-MAA) has been used; however, planar scintigraphy imaging techniques are not quantitatively accurate and adequate spatial information is not attained. Here, we describe a reliable, minimally invasive and rapid in vivo imaging technique, using three-dimensional single photon emission computed tomography (3D SPECT) modus, that allows more accurate quantification, serial measurements and spatial discrimination. Methodology: Partial portal vein ligation, common bile duct ligation and sham were induced in male mice. A mixture of 51Cr microspheres and 99mTc-macroaggregated albumin particles was injected into the splenic pulpa. All mice were scanned in vivo with μSPECT (1 mm spatial resolution) and, when mandatory for localisation, a μSPECT-CT was acquired. A relative quantitative analysis was performed based on the 3D reconstructed datasets. Additionally, 51Cr was measured in the same animals to calculate the correlation coefficient between the 99mTc detection and the gold standard 51Cr. In each measuring modality, the PSS fraction was calculated using the formula: [(lung counts)/(lung counts+liver counts)] × 100. Results: A significant correlation between the 99mTc detection and 51Cr was demonstrated in partial portal vein ligation, common bile duct ligation and sham mice and there was a good agreement between the two modalities. μSPECT scanning delivers high spatial resolution and 3D image reconstructions. Conclusion: We have demonstrated that quantitative high-resolution μSPECT imaging with 99mTc-MAA is useful for detecting the extent of PSS in a non-sacrificing set-up. This technology permits serial measurements and high-throughput screening to detect baseline PSS, which is especially important in pharmacological studies.
E-info
https://repository.uantwerpen.be/docman/iruaauth/e8478d/b41b812a030.pdf
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