Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=26973245
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26973245
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Oncogene
2016 ; 35
(29
): 3829-38
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
TAK1 regulates hepatic lipid homeostasis through SREBP
#MMPMID26973245
Morioka S
; Sai K
; Omori E
; Ikeda Y
; Matsumoto K
; Ninomiya-Tsuji J
Oncogene
2016[Jul]; 35
(29
): 3829-38
PMID26973245
show ga
Sterol-regulatory element-binding proteins (SREBPs) are key transcription factors
regulating cholesterol and fatty acid biosynthesis. SREBP activity is tightly
regulated to maintain lipid homeostasis, and is modulated upon extracellular
stimuli such as growth factors. While the homeostatic SREBP regulation is well
studied, stimuli-dependent regulatory mechanisms are still elusive. Here we
demonstrate that SREBPs are regulated by a previously uncharacterized mechanism
through transforming growth factor-? activated kinase 1 (TAK1), a signaling
molecule of inflammation. We found that TAK1 binds to and inhibits mature forms
of SREBPs. In an in vivo setting, hepatocyte-specific Tak1 deletion upregulates
liver lipid deposition and lipogenic enzymes in the mouse model. Furthermore,
hepatic Tak1 deficiency causes steatosis pathologies including elevated blood
triglyceride and cholesterol levels, which are established risk factors for the
development of hepatocellular carcinoma (HCC) and are indeed correlated with
Tak1-deficiency-induced HCC development. Pharmacological inhibition of SREBPs
alleviated the steatosis and reduced the expression level of the HCC marker gene
in the Tak1-deficient liver. Thus, TAK1 regulation of SREBP critically
contributes to the maintenance of liver homeostasis to prevent steatosis, which
is a potentially important mechanism to prevent HCC development.