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Hasegawa, Sho; Susaki, Etsuo A.; Tanaka, Tetsuhiro; Komaba, Hirotaka; Wada, Takehiko; Fukagawa, Masafumi; Ueda, Hiroki R.; Nangaku, Masaomi
Kidney international, 07/2019, Volume: 96, Issue: 1Journal Article
The sympathetic nervous system is critical in maintaining the homeostasis of renal functions. However, its three-dimensional (3D) structures in the kidney have not been elucidated due to limitation of conventional imaging methods. CUBIC (Clear, Unobstructed Brain/Body Imaging Cocktails and Computational analysis) is a newly developed tissue-clearing technique, which enables whole-organ 3D imaging without thin-sectioning. Comprehensive 3D imaging by CUBIC found that sympathetic nerves are primarily distributed around arteries in the mouse kidney. Notably, the sympathetic innervation density was significantly decreased 10 days after ischemia-reperfusion injury (voluminal ratio of innervation area to kidney) by about 70%. Moreover, norepinephrine levels in kidney tissue (output of sympathetic nerves) were significantly reduced in injured kidneys by 77%, confirming sympathetic denervation after ischemia-reperfusion injury. Time-course imaging indicated that innervation partially recovered although overall denervation persisted 28 days after injury, indicating a continuous sympathetic nervous abnormality during the progression of chronic kidney disease. Thus, CUBIC-kidney, the 3D imaging analysis, can be a strong imaging tool, providing comprehensive, macroscopic perspectives for kidney research. Display omitted
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