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In Vivo Phenotyping of the ob/ob Mouse by Magnetic Resonance Imaging and 1H-Magnetic Resonance Spectroscopy
Version of Record online: 6 SEP 2012
2006 North American Association for the Study of Obesity (NAASO)
Volume 14, Issue 3, pages 405–414, March 2006
How to Cite
Calderan, L., Marzola, P., Nicolato, E., Fabene, P. F., Milanese, C., Bernardi, P., Giordano, A., Cinti, S. and Sbarbati, A. (2006), In Vivo Phenotyping of the ob/ob Mouse by Magnetic Resonance Imaging and 1H-Magnetic Resonance Spectroscopy. Obesity, 14: 405–414. doi: 10.1038/oby.2006.54
- Issue online: 6 SEP 2012
- Version of Record online: 6 SEP 2012
- Received for review March 11, 2004; Accepted in final form December 26, 2005
- brown adipose tissue;
- white adipose tissue;
- magnetic resonance imaging;
- magnetic resonance spectroscopy
Objective: We studied ob/ob and wild-type (WT) mice to characterize the adipose tissues depots and other visceral organs and to establish an experimental paradigm for in vivo phenotyping.
Research Methods and Procedures: An in vivo evaluation was conducted using magnetic resonance imaging and 1H-magnetic resonance spectroscopy (1H-MRS). We used T1-weighted images and three-dimensional spin echo T1-weighted images for the morphological analysis and 1H-MRS spectra on all body mass, as well as 1H-MRS spectra focalized on specific lipid depots [triglyceride (TG) depots] for a molecular analysis.
Results: In ob/ob mice, three-dimensional evaluation of the trunk revealed that ∼64% of the volume consists of white adipose tissue, which is 72% subcutaneous and 28% visceral. In vivo 1H-MRS showed that 20.00 ± 6.92% in the WT group and 58.67 ± 6.65% in the ob/ob group of the total proton content is composed of TG protons. In in vivo-localized spectra of ob/ob mice, we found a polyunsaturation degree of 0.5247 in subcutaneous depots. In the liver, we observed that 48.7% of the proton signal is due to water, whereas in the WT group, the water signal amounted to 82.8% of the total proton signal. With the sequences used, the TG amount was not detectable in the brain or kidneys.
Discussion: The present study shows that several parameters can be obtained by in vivo examination of ob/ob mice by magnetic resonance imaging and 1H-MRS and that the accumulated white adipose tissue displays low polyunsaturation degree and low hydrolipidic ratio. Relevant anatomical alterations observed in urinary and digestive apparatuses should be considered when ob/ob mice are used in experimental paradigms.