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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 J+Biol+Chem
2016 ; 291
(13
): 6989-7003
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Ceramide Synthase 5 Is Essential to Maintain C16:0-Ceramide Pools and Contributes
to the Development of Diet-induced Obesity
#MMPMID26853464
Gosejacob D
; Jäger PS
; Vom Dorp K
; Frejno M
; Carstensen AC
; Köhnke M
; Degen J
; Dörmann P
; Hoch M
J Biol Chem
2016[Mar]; 291
(13
): 6989-7003
PMID26853464
show ga
Ceramides are bioactive sphingolipids, which are composed of sphingoid bases
carrying acyl chains of various lengths. Ceramides are synthesized by a family of
six ceramide synthases (CerS) in mammals, which produce ceramides with
differentN-linked acyl chains. Increased ceramide levels are known to contribute
to the development of obesity and insulin resistance. Recently, it has been
demonstrated that the ceramide acylation pattern is of particular importance for
an organism to maintain energy homeostasis. However, which of theCerSfamily
members are involved in this process is not yet completely known. Using newly
developedCerS5knock-out mice, we show here thatCerS5is essential to maintain
cellular C16:0sphingolipid pools in lung, spleen, muscle, liver, and white
adipose tissue. Glycerophospholipid levels inCerS5-deficient mice were not
altered. We found a strong impact of CerS5-dependent ceramide synthesis in white
adipose tissue after high fat diet feeding. In skeletal muscle, liver, and
spleen, C16:0-ceramide levels were altered independent of feeding conditions. The
loss ofCerS5is associated with reduced weight gain and improved systemic health,
including maintenance of glucose homeostasis and reduced white adipose tissue
inflammation after high fat diet challenge. Our findings indicate that reduction
of endogenous C16:0-ceramide by genetic inhibition ofCerS5is sufficient to
ameliorate obesity and its comorbidities.