Assessment of renal function in mice with unilateral ureteral obstruction using 99mTc-MAG3 dynamic scintigraphy

BMC Nephrology

Research Article

Hiroki Fujita¹  Todd E Peterson²  Feng Wang³  Christopher C Quarles³  Mohammed N Tantawy³  Rosie Jiang⁴  Keiko Takahashi⁴  Chuan-Ming Hao⁴  Dana Zemel⁴  Raymond C Harris⁵  Takamune Takahashi⁵ 

[1] Division of Endocrinology, Metabolism and Geriatric Medicine, Akita University Graduate School of Medicine, Akita, Japan;Radiology and Vanderbilt University Institute of Imaging Science, Nashville, TN, USA;Radiology and Vanderbilt University Institute of Imaging Science, Nashville, TN, USA;Vanderbilt O'Brien Mouse Kidney Physiology and Disease Center, Vanderbilt University Medical Center, Nashville, TN, USA;Vanderbilt O'Brien Mouse Kidney Physiology and Disease Center, Vanderbilt University Medical Center, Nashville, TN, USA;Vanderbilt O'Brien Mouse Kidney Physiology and Disease Center, Vanderbilt University Medical Center, Nashville, TN, USA;Division of Nephrology and Hypertension, Vanderbilt University School of Medicine, S-3223, MCN, 37232, Nashville, TN, USA;

关键词: Nuclear imaging;    Renal scintigraphy;    Tc-MAG3;    Mouse model;    Unilateral ureteral obstruction;    Renal function;   

DOI  :  10.1186/1471-2369-13-168

 received in 2012-06-14, accepted in 2012-11-27,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundRenal scintigraphy using 99mTc-mercaptoacetyltriglycine (99mTc-MAG3) is widely used for the assessment of renal function in humans. However, the application of this method to animal models of renal disease is currently limited, especially in rodents. Here, we have applied 99mTc-MAG3 renal scintigraphy to a mouse model of unilateral ureteral obstruction (UUO) and evaluated its utility in studying obstructive renal disease.MethodsUUO mice were generated by complete ligation of the left ureter. Sham-operated mice were used as a control. Renal function was investigated on days 0, 1, 3, and 6 post-surgery using dynamic planar imaging of 99mTc-MAG3 activity following retro-orbital injection. Time-activity curves (TACs) were produced for individual kidneys and renal function was assessed by 1) the slope of initial 99mTc-MAG3 uptake (SIU), which is related to renal perfusion; 2) peak activity; and 3) the time-to-peak (TTP). The parameters of tubular excretion were not evaluated in this study as 99mTc-MAG3 is not excreted from UUO kidneys.ResultsCompared to sham-operated mice, SIU was remarkably (>60%) reduced in UUO kidneys at day 1 post surgery and the TACs plateaued, indicating that 99mTc-MAG3 is not excreted in these kidneys. The plateau activity in UUO kidneys was relatively low (~40% of sham kidney’s peak activity) as early as day1 post surgery, demonstrating that uptake of 99mTc-MAG3 is rapidly reduced in UUO kidneys. The time to plateau in UUO kidneys exceeded 200 sec, suggesting that 99mTc-MAG3 is slowly up-taken in these kidneys. These changes advanced as the disease progressed. SIU, peak activity and TTPs were minimally changed in contra-lateral kidneys during the study period.ConclusionsOur data demonstrate that renal uptake of 99mTc-MAG3 is remarkably and rapidly reduced in UUO kidneys, while the changes are minimal in contra-lateral kidneys. The parametric analysis of TACs suggested that renal perfusion as well as tubular uptake is reduced in UUO kidneys. This imaging technique should allow non-invasive assessments of UUO renal injury and enable a more rapid interrogation of novel therapeutic agents and protocols.

【 授权许可】

Unknown   
© Tantawy et al.; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.