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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2016 ; 11
(3
): e0152191
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Imaging Mass Spectrometry Reveals Acyl-Chain- and Region-Specific Sphingolipid
Metabolism in the Kidneys of Sphingomyelin Synthase 2-Deficient Mice
#MMPMID27010944
Sugimoto M
; Wakabayashi M
; Shimizu Y
; Yoshioka T
; Higashino K
; Numata Y
; Okuda T
; Zhao S
; Sakai S
; Igarashi Y
; Kuge Y
PLoS One
2016[]; 11
(3
): e0152191
PMID27010944
show ga
Obesity was reported to cause kidney injury by excessive accumulation of
sphingolipids such as sphingomyelin and ceramide. Sphingomyelin synthase 2 (SMS2)
is an important enzyme for hepatic sphingolipid homeostasis and its dysfunction
is considered to result in fatty liver disease. The expression of SMS2 is also
high in the kidneys. However, the contribution of SMS2 on renal sphingolipid
metabolism remains unclear. Imaging mass spectrometry is a powerful tool to
visualize the distribution and provide quantitative data on lipids in tissue
sections. Thus, in this study, we analyzed the effects of SMS2 deficiency on the
distribution and concentration of sphingomyelins in the liver and kidneys of mice
fed with a normal-diet or a high-fat-diet using imaging mass spectrometry and
liquid chromatography/electrospray ionization-tandem mass spectrometry. Our study
revealed that high-fat-diet increased C18-C22 sphingomyelins, but decreased
C24-sphingomyelins, in the liver and kidneys of wild-type mice. By contrast, SMS2
deficiency decreased C18-C24 sphingomyelins in the liver. Although a similar
trend was observed in the whole-kidneys, the effects were minor. Interestingly,
imaging mass spectrometry revealed that sphingomyelin localization was specific
to each acyl-chain length in the kidneys. Further, SMS2 deficiency mainly
decreased C22-sphingomyelin in the renal medulla and C24-sphingomyelins in the
renal cortex. Thus, imaging mass spectrometry can provide visual assessment of
the contribution of SMS2 on acyl-chain- and region-specific sphingomyelin
metabolism in the kidneys.