Hyperpolarized He diffusion MRI and histology of secreted frizzled related protein-1 (SFRP1) deficient lungs in a Murine model |
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Authors: | Sarmad Siddiqui Yi Xin Kiarash Emami Jeanine D'Armiento Takayuki Shiomi Harrilla Profka Puttisarn Mongkolwisetwara Rahim Rizi |
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Institution: | 1. Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA;2. Department of Medicine, Columbia University, New York, NY, USA |
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Abstract: | Secreted frizzled related protein-1 (SFRP1) plays a key role in many diverse processes, including embryogenesis, tissue repair, bone formation, and tumor genesis. Previous studies have shown the effects of the SFRP1 gene on lung development using the SFRP1 knockout mouse model via histological and physiological studies. In this study, the feasibility of ADC (acquired via HP 3He) to detect altered lung structure in the SFRP1 knockout (SFRP1−/−) mice was investigated, and compared to analysis by histology. This study consisted of two groups, the wild-type (WT) mice and the knockout (KO) mice with n = 6 mice for each group. 3He ADC MRI and histology were performed on all of the animals. The global Lm values of WT and KO mice were 35.0 ± 0.8 μm and 38.4 ± 3.8 μm, respectively, which translated to an increase of 9.58% in the Lm of KO mice. The mean global ADCs for the WT and KO mice were 0.12 ± 0.01 cm2/s and 0.13 ± 0.01 cm2/s, respectively, which equated to a relative increase of 8.0% in the KO mice compared to the WT mice. In the sub-analysis of the anterior, medial and posterior lung regions, Lm increased by 10.50%, 6.66% and 11.84% in the KO mice, respectively, whereas the differences in ADC between the two groups in the anterior, medial, and posterior regions were 7.3%, 8.3%, and 4.6%, respectively. These results suggest that HP MRI measurements can be used as a suitable substitute for histology to obtain valuable information about lung geometry non-invasively. This technique is also advantageous as regional measurements can be performed, which can identify lung destruction more precisely. Most importantly, this approach extends far beyond the specific pathology analyzed in this study, as it can be applied to many other pathological conditions in the lung tissue, as well to many other embryonic studies. |
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Keywords: | SFRP1 secreted frizzled receptor protein-1 HP HYPERPOLARIZED Lm mean linear intercept WT wild-type KO knockout |
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