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2017 ; 6
(6
): e347
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TIP30 regulates lipid metabolism in hepatocellular carcinoma by regulating SREBP1
through the Akt/mTOR signaling pathway
#MMPMID28604762
Yin F
; Sharen G
; Yuan F
; Peng Y
; Chen R
; Zhou X
; Wei H
; Li B
; Jing W
; Zhao J
Oncogenesis
2017[Jun]; 6
(6
): e347
PMID28604762
show ga
Lipid reprogramming has been considered as a crucial characteristic in
hepatocellular carcinoma (HCC) initiation and progression. However, detailed
molecular mechanisms have yet to be clearly defined. Here, we examined the
effects of tumor suppressor TIP30 on the regulation of HCC lipid metabolism. We
found that decreased TIP30 expression leads to elevated fatty acid synthesis and
enhanced levels of lipogenic enzymes SCD and FASN in HCC cells. Moreover, SREBP1
is one of the key transcription factors regulating liver lipid metabolism, and
TIP30 deficiency significantly increased SREBP1 expression and nuclear
accumulation. Small interfering RNAs targeting SREBP1 could reverse fatty acid
synthesis induced by TIP30 deficiency. Furthermore, downregulating TIP30
activated the Akt/mTOR signaling pathway to upregulate SREBP1 expression, which
promoted lipid metabolism by activating gene transcription of lipogenesis,
including fasn and scd. We also showed that TIP30 deficiency-regulated lipid
metabolism promoted proliferation of HCC cells. Clinically, our data revealed
that TIP30 expression significantly correlated with SREBP1 in patients with HCC
and that a combination of TIP30 and SREBP1 is a powerful predictor of HCC
prognosis. Together, our data suggested a novel function of TIP30 in HCC
progression and indicate that TIP30 regulation of SREBP1 may represent a novel
target for HCC treatment.