Abstract
Background
Renin–angiotensin system (RAS) activation increases angiotensin II production stimulating profibrotic factors, especially in the setting of chronic kidney disease. Nephrogenic systemic fibrosis (NSF) has been associated with gadolinium (Gd) exposure and renal failure. RAS involvement in NSF is unclear compared to transforming growth factor beta and Smad. RenTag mice were chosen to investigate the role of RAS in NSF-like dermal fibrosis because they demonstrated dermal fibrosis at birth, perturbations of RAS in subcutaneous tissue, and renal failure within 4 weeks of age.
Methods
Wild-type and RenTag mice were injected weekly with a supratherapeutic dose of intravenous gadodiamide (3.0 mmol/kg body weight) and killed at 12 weeks of age for skin and kidney histology.
Results
RenTag mice had elevated BUN levels, pitted kidneys, and glomerular damage. RenTag mice skin revealed an increased density of fibroblasts, no mucopolysaccharide deposits, and increased collagen fibril density regardless of Gd exposure. Skin and kidney histopathology of wild-type mice were normal regardless of Gd exposure. CD34 positivity was higher in RenTag compared to wild-type.
Conclusions
Since RenTag dermal lesions remained unchanged after gadolinium exposure in the setting of renal failure, this animal model suggests perturbations of subcutaneous RAS may be involved in Gd-naïve dermal fibrosis.
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Acknowledgments
Mary Kay Ellsworth for animal husbandry, Michael Rusiniak for assistance with photography, and HL048459 (KWG) and Roswell Park Cancer Institute core grant CA016056 for support.
Conflict of interest
The authors state no conflict of interest. This project was funded with a grant from the National Kidney Foundation of WNY. Dr. Mandip Panesar has served as an expert witness on NSF cases. Dr. George Hajduczok is also a practicing attorney. He is not involved in litigation related to the subject matter of this study.
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Sexton, S., Tulowitzki, R., Jones, C.A. et al. Involvement of the renin–angiotensin system in the development of nephrogenic systemic fibrosis-like lesions in the RenTag mouse model. Clin Exp Nephrol 20, 162–168 (2016). https://doi.org/10.1007/s10157-015-1141-z
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DOI: https://doi.org/10.1007/s10157-015-1141-z