2. Academic Validation
  3. SIK2 enhances synthesis of fatty acid and cholesterol in ovarian cancer cells and tumor growth through PI3K/Akt signaling pathway

SIK2 enhances synthesis of fatty acid and cholesterol in ovarian cancer cells and tumor growth through PI3K/Akt signaling pathway

  • Cell Death Dis. 2020 Jan 13;11(1):25. doi: 10.1038/s41419-019-2221-x.
Jing Zhao 1,  Xiaohong Zhang 2,  Tian Gao 2,  Shanci Wang 3,  Yiran Hou 4,  Peng Yuan 1 5,  Yi Yang 5,  Tao Yang 5,  Jinliang Xing 1,  Jibin Li 6 7,  Shujuan Liu 8
Affiliations

Affiliations

  • 1 State Key Laboratory of Cancer Biology and Department of Physiology and Pathophysiology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
  • 2 Department of Gynaecology and Obstetrics, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
  • 3 Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastorenterology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
  • 4 Medical College of Yan'an University, Yan'an, Shaanxi, 716000, China.
  • 5 Department of Pain Treatment, Tangdu Hospital, The Fourth Military Medical University, Xi'an, Shaanxi, 710038, China.
  • 6 State Key Laboratory of Cancer Biology and Department of Physiology and Pathophysiology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China. lijibin2006@163.com.
  • 7 State Key Laboratory of Cancer Biology and Experimental Teaching Center of Basic Medicine, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China. lijibin2006@163.com.
  • 8 Department of Gynaecology and Obstetrics, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China. hanliu@fmmu.edu.cn.
PMID: 31932581 DOI: 10.1038/s41419-019-2221-x
Abstract

Salt-inducible kinase 2 (SIK2) has been established as a regulator of diverse biological processes including cell metabolism. A recent study has reported that SIK2 is required for adipocyte-induced ovarian Cancer (OC) survival through facilitating fatty acid oxidation. However, whether SIK2 also plays a role in the lipid synthesis in OC cells remains elusive. Here, we showed that SIK2 significantly promoted the lipid synthesis in OC cells. On the one hand, SIK2 enhanced fatty acid synthesis through upregulating the expression of sterol regulatory element binding protein 1c (SREBP1c) and thus the transcription of major lipogenic Enzyme FASN. On the Other hand, SIK2 promoted Cholesterol synthesis through upregulating the expression of sterol regulatory element binding protein 2 (SREBP2) and thus the transcription of major Cholesterol synthesis Enzymes HMGCR. Moreover, PI3K/Akt signaling pathway was found to be involved in the upregulation of SREBP1c and SREBP2 in OC cells. Moreover, in vitro and in vivo assays indicated that the SIK2-regulated fatty acid and Cholesterol synthesis played a critical role in the growth of OC cells. Our findings demonstrate that SIK2 is a critical regulator of lipid synthesis in OC cells and thus promotes OC growth, which provides a strong line of evidence for this molecule to be used as a therapeutic target in the treatment of this malignancy.

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