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It TAK(es) 1 to prevent steatohepatitis and tumorigenesis
Priya Handa
,
, Kris V. Kowdley
,
* Benaroya Research Institute, Seattle, Washington, USA, Liver Transplant Care Network, Swedish, Seattle, WA, USA
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="s0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0005">Article commented&#58;</span><p id="p0005" class="elsevierStylePara elsevierViewall">TAKl-mediated autophagy and fatty acid oxidation prevent hepatosteatosis and tumorigenesis&#46; Inokuchi-Shimizu S&#44; Park EJ&#44; Roh YS&#44; Yang L&#44; Zhang B&#44; Song J&#44; Liang S&#44; Pimienta M&#44; Taniguchi K&#44; Wu X&#44; Asahina K&#44; Lagakos W&#44; Mackey MR&#44; Akira S&#44; Ellisman MH&#44; Sears DD&#44; Olefsky JM&#44; Karin M&#44; Brenner DA&#44; Seki E&#46; <span class="elsevierStyleItalic">J Clin Invest 2014&#59;</span> 124&#40;8&#41;&#58; 3566-78&#46;</p></span><span id="s0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0010">Comment&#58;</span><p id="p0010" class="elsevierStylePara elsevierViewall">TAK1 &#40;TGF-&#946; activated kinase 1&#41; is activated by TLRs&#44; IL-1&#44; TNF&#44; and TGF-&#946;&#44; and in turn&#44; regulates two main transcription factors&#44; IKK&#47;NF- &#954;B and JNK&#44; which control a plethora of essential cellular functions such as cell proliferation&#44; survival&#44; growth&#44; inflammation&#44; tumorigenesis&#44; insulin sensitivity and lipid metabolism&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> While sustained JNK signaling has been known to exert pathophysiological effects on the liver by causing inflammation&#44; cell death&#44; reactive oxygen species &#40;ROS&#41; generation&#44; lipid accumulation and hepatocellular carcinoma &#40;HCC&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> IKK&#47;NF- &#954;B signaling has been shown to prevent TNF- and ROSmediated cell death&#44; steatosis and HCC&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Since TAK1 regulates both IKK&#47;NF- &#954;B and JNK pathways with seemingly contrasting effects&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a>&#44;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> its role in liver has been difficult to envisage&#46; These authors previously showed that hepatocyte-specific ablation of TAK1 led to spontaneous liver inflammation&#44; apoptosis&#44; fibrosis and HCC development&#44; mediated through TNF- and TGF-&#946; signaling&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="p0015" class="elsevierStylePara elsevierViewall">In addition to regulating IKK&#47;NF- &#954;B and JNK&#44; TAK1 signaling is also believed to enhance AMPK-mediated autophagy&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Since AMPK is a metabolic sensor&#44; it is activated upon nutrient deprivation&#44; and in turn suppresses mTORC1 complex&#44; a regulator of lipid metabolism and autophagy&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> Under of nutrient excess&#44; conditions&#44; when ATP levels are high&#44; AMPK activity is suppressed leading to activation of mTORC1&#44; and thereby increased lipid biosynthesis via upregulation of ppar &#947; and SREBP1c&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> In addition&#44; mTORC1 is also known to inhibit ppar alpha&#44; which regulates hepatic fatty acid oxidation &#40;FAO&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> AMPK activation and mTORC1 inhibition regulate autophagy&#44; to remove and recycle cellular components&#44; during a phase with limited nutrients&#46; Autophagy promotes lipid breakdown and inhibits lipid storage&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a></p><p id="p0020" class="elsevierStylePara elsevierViewall">In this elegant work&#44; the authors have expanded our understanding of this enigmatic and important regulator by clarifying the metabolic function of TAK1&#44; and the pathophysiological relevance o f TAK1 regulating autophagy and lipid metabolism through AMPK&#47;mTORC1&#44; and therefore&#44; its effect on liver metabolism and liver tumorigenesis&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a></p><p id="p0025" class="elsevierStylePara elsevierViewall">To address the physiological role of TAK1 in the liver&#44; the authors first assessed the effect of acute fasting on 1 month old WT &#40;wild type&#41; mice&#44; and mice carrying a hepatocyte-specific deletion of TAK1&#46; After 12 hours of fasting&#44; they found that the livers of &#916;hep TAK1 mice showed hepatic steatosis and had significantly elevated hepatic triglycerides&#46; Hepatocytes isolated from such mice showed lipid accumulation&#44; relative to their WT counterparts&#46; Furthermore&#44; liver lysates from fasted &#916;hep TAK1 mice showed overactivation of S6&#44; a marker of mTORC1 activity&#44; whereas WT livers showed an inhibition of mTORC1 activation&#44; consistent with nutrient deficiency&#46; Thus&#44; lipid deposition in the liver is TAK1 dependent&#44; and absence of TAK1 causes excessive mTORC1 activation&#46;</p><p id="p0030" class="elsevierStylePara elsevierViewall">Next&#44; the authors assessed AMPK activation and autophagy under fasting conditions in WT and &#916;hep TAK1 livers&#46; They observed that AMPK activation was reduced in the livers of &#916;hep TAK1 mice&#44; relative to WT livers&#46; Furthermore&#44; autophagy was reduced in the livers of &#916;hep TAK1 mice&#44; assessed by the increased expression of p62&#44; relative to fasted WT livers&#44; which showed reduced p62 expression &#40;a marker of autophagy induction&#41;&#46; In addition&#44; an AMPK activator such as metformin increased TAK1 kinase activity and overexpression of AMPK could stimulate autophagy in livers of &#916;hep TAK1 mice&#44; indicating that AMPK is a downstream effector of TAK1&#44; which mediates its effect on autophagy&#46;</p><p id="p0035" class="elsevierStylePara elsevierViewall">The authors next wanted to address the cause of steatosis in the livers of &#916;hep TAK1 mice&#46; On examining the expression of hepatic fatty acid oxidation &#40;FAO&#41; genes&#44; they found that ppar alpha target genes and FAO genes &#40;Cpt1a&#44; Acox&#41; were downregulated in the livers of &#916;hep TAK 1 mice relative to WT livers&#44; indicating that TAK1 deficiency suppresses ppar alpha activity and the induction of its target genes&#44; thus enhancing lipid accumulation in their livers&#46;</p><p id="p0040" class="elsevierStylePara elsevierViewall">Since TAK1 deficiency causes overstimulation of mTORC1&#44; the authors next asked if rapamycin &#40;an established inhibitor of mTORC1&#41; could restore autophagy in the livers of &#916;hep TAK mice&#44; and ppar alpha function&#44; reducing lipid accumulation in &#916;hep TAK1 livers&#46; They found that autophagy was restored&#44; and so was ppar alpha-induced FAO&#46; This salutary effect of mTORC1 inhibition was due to restoration of autophagy&#44; indicating that a defect in autophagy was responsible for the hepatic steatosis in the &#916;hep TAK1 livers&#46; Furthermore&#44; this rescue establishes that TAK1 acts upstream of mTORC1&#46;</p><p id="p0045" class="elsevierStylePara elsevierViewall">Since TAK1 expression levels are lower in experimental fatty liver disease and in obese mice&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> the authors wished to test the response of liver-specific TAK1 ablation to a High Fat Diet &#40;HFD&#41; challenge&#46; After 12 weeks on a HFD&#44; relative to WT mice&#44; TAK1 deficient livers showed increased steatosis&#44; increased hepatic TG&#44; FFA&#44; serum ALT and impaired autophagy &#40;increased p62 accumulation&#41;&#46; They showed elevated expression of lipid synthesis genes &#40;SREBP1C&#44; DGAT1&#41;&#44; inflammatory genes &#40;TNF-&#945;&#44; IL-6&#41;&#44; fibrogenic markers &#40;collagen1a1&#44;TGF-&#946;&#41; and also showed significantly enhanced expression of Afp&#44; a HCC marker&#46; Thus&#44; TAK1 deficiency exacerbates a HFD- induced steatohepatitis&#44; as a result of impaired lipid metabolism and autophagy&#44; and also accelerates liver tumorigenesis&#46; Notably&#44; there was no difference in blood glucose levels and body weighs between HFD-fed WT and &#916;hep TAK1 mice&#44; despite liver pathophysiology&#46;</p><p id="p0050" class="elsevierStylePara elsevierViewall">Finally&#44; the authors wanted to test if rapamycin would protect livers of &#916;hep TAK1 mice from hepatocellular-carcinoma &#40;HCC&#41;&#44; since these mice spontaneously develop HCC with expression of typical HCC markers such as alpha fetoprotein&#44; glypican3 and others&#44; relative to WT mice&#46; The authors tested if restoration of autophagy and inactivation of mTORC1 could block HCC development&#46; They found that rapamycin is effective in reducing the number of tumors in an early treatment regimen &#40;2 -10 weeks from birth&#41; and a late therapy with rapamycin &#40;7-9 months of age&#41; reduced the number and size of tumors and fibrosis&#46;</p><p id="p0055" class="elsevierStylePara elsevierViewall">In summary&#44; in this work the authors have shed light on yet another critical role of TAK1&#58; as a regulator of AMPK&#44; an inhibitor of mTORC1 and as a mediator of autophagy&#59; serving as a master regulator of lipid metabolism in the liver&#46; While there is still no evidence showing TAK1 deficiency in human HCC&#59; TAK1 deletion is observed in human prostate cancers&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Based on the important findings in this study&#44; it is conceivable that inhibition of mTORC1 activity could become a useful therapy for HCC&#46;</p></span></span>"
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ISSN: 16652681
Original language: English
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