title: Hyperpolarized (3)He diffusion MRI and histology of secreted frizzled related protein-1 (SFRP1) deficient lungs in a Murine model.
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 (3)He) 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. (3)He ADC MRI and histology were performed on all of the animals. The global Lm values of WT and KO mice were 35.0±0.8μm and 38.4±3.8μm, 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±0.01cm(2)/s and 0.13±0.01cm(2)/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.
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA. Electronic address: sarmads@seas.upenn.edu.
authors.forename: Sarmad
authors.initials: S
authors.lastname: Siddiqui
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xin
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA.
authors.forename: Kiarash
authors.initials: K
authors.lastname: Emami
authors.affiliation: Department of Medicine, Columbia University, New York, NY, USA.
authors.forename: Jeanine
authors.initials: J
authors.lastname: D'Armiento
authors.affiliation: Department of Medicine, Columbia University, New York, NY, USA.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shiomi
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA.
authors.forename: Harrilla
authors.initials: H
authors.lastname: Profka
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA.
authors.forename: Puttisarn
authors.initials: P
authors.lastname: Mongkolwisetwara
authors.affiliation: Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA.
authors.forename: Rahim
authors.initials: R
authors.lastname: Rizi
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D004195:Disease Models, Animal; D004646:Emphysema / Q000473:pathology*; D005240:Feasibility Studies; D006371:Helium / Q000008:administration & dosage; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics*; D007554:Isotopes / Q000008:administration & dosage; D008168:Lung / Q000473:pathology*; D008565:Membrane Proteins / Q000235:genetics*; D018345:Mice, Knockout; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D000094742:Secreted Frizzled-Related Proteins
chemical_list: D006371:Helium; D036341:Intercellular Signaling Peptides and Proteins; D007554:Isotopes; D008565:Membrane Proteins; C485539:Sfrp1 protein, mouse; D000094742:Secreted Frizzled-Related Proteins
keywords: ADC; Embryogenesis; Helium-3 MRI; Hyperpolarized gas MRI; Knockout; Lungs; SFRP; Secreted frizzled related protein