Unsaturated Fatty Acids Increase the Expression of Hepassocin through a Signal Transducer and Activator of Transcription 3-Dependent Pathway in HepG2 Cells

Kai Pi Cheng, Horng Yih Ou, Hao Chang Hung, Chung Hao Li, Kang Chih Fan, Jin Shang Wu, Hung Tsung Wu, Chih Jen Chang

Research output: Contribution to journalArticle

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Abstract

Hepassocin (HPS) is a hepatokine that regulates hepatocyte proliferation. It is known that HPS plays an important role in the development of nonalcoholic fatty liver diseases (NAFLD). Fatty acids, such as oleic acid (OLA), exhibit the ability to activate the signal transducer and activator of transcription-3 (STAT3), and the binding site of STAT3 is found in the promoter region of HPS. However, the regulation of HPS by fatty acids is still obscure. To clarify the regulation of HPS, we detected the expression of HPS by western blots. In addition, a hepatic steatosis cell culture model was established by treatment of different fatty acids, including linoleic acid (LNA), oleic acid, palmitic acid, and stearic acid. The intracellular lipid accumulation was confirmed by oil red O staining. Blocking of STAT3 activity was achieved by the pretreatment of the STAT3 inhibitor, stattic. We found that activation of STAT3 by interleukin-6 (IL-6) was mediated in the regulation of HPS expression. Treatment of unsaturated fatty acids significantly induced intracellular lipid accumulation in HepG2 cells. Moreover, the expressions of HPS were increased in unsaturated fatty acid-treated HepG2 cells, as compared with saturated fatty acid-treated groups. Also, the expression of HPS induced by OLA was blocked by the inhibition of STAT3 activity. Furthermore, we found that deletion of HPS by small interfering ribonucleic acid transfection decreased the protective effect of OLA on cell viability. Taken together, we provided evidence that STAT3 plays an important role in the regulation of OLA-induced HPS expression and the increased HPS may further participate in the development of NAFLD. In addition, the increase of HPS might be involved in the protective effect of OLA on cell viability.

Original languageEnglish
Pages (from-to)863-869
Number of pages7
JournalLipids
Volume53
Issue number9
DOIs
Publication statusPublished - Sep 1 2018

Fingerprint

STAT3 Transcription Factor
Hep G2 Cells
Unsaturated Fatty Acids
Oleic Acid
Fatty Acids
Liver
Hepatocytes
Cell Survival
Cells
Lipids
Palmitic Acid
Linoleic Acid
Cell culture
Genetic Promoter Regions
Transfection
Interleukin-6
Cell Culture Techniques
Western Blotting
Chemical activation
Binding Sites

Keywords

  • Hepassocin
  • Hepatic steatosis
  • Oleic acid
  • Signal transducer and activator of transcription 3
  • Unsaturated fatty acids

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Cell Biology

Cite this

Unsaturated Fatty Acids Increase the Expression of Hepassocin through a Signal Transducer and Activator of Transcription 3-Dependent Pathway in HepG2 Cells. / Cheng, Kai Pi; Ou, Horng Yih; Hung, Hao Chang; Li, Chung Hao; Fan, Kang Chih; Wu, Jin Shang; Wu, Hung Tsung; Chang, Chih Jen.

In: Lipids, Vol. 53, No. 9, 01.09.2018, p. 863-869.

Research output: Contribution to journalArticle

Cheng, Kai Pi ; Ou, Horng Yih ; Hung, Hao Chang ; Li, Chung Hao ; Fan, Kang Chih ; Wu, Jin Shang ; Wu, Hung Tsung ; Chang, Chih Jen. / Unsaturated Fatty Acids Increase the Expression of Hepassocin through a Signal Transducer and Activator of Transcription 3-Dependent Pathway in HepG2 Cells. In: Lipids. 2018 ; Vol. 53, No. 9. pp. 863-869.
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AU - Cheng, Kai Pi

AU - Ou, Horng Yih

AU - Hung, Hao Chang

AU - Li, Chung Hao

AU - Fan, Kang Chih

AU - Wu, Jin Shang

AU - Wu, Hung Tsung

AU - Chang, Chih Jen

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AB - Hepassocin (HPS) is a hepatokine that regulates hepatocyte proliferation. It is known that HPS plays an important role in the development of nonalcoholic fatty liver diseases (NAFLD). Fatty acids, such as oleic acid (OLA), exhibit the ability to activate the signal transducer and activator of transcription-3 (STAT3), and the binding site of STAT3 is found in the promoter region of HPS. However, the regulation of HPS by fatty acids is still obscure. To clarify the regulation of HPS, we detected the expression of HPS by western blots. In addition, a hepatic steatosis cell culture model was established by treatment of different fatty acids, including linoleic acid (LNA), oleic acid, palmitic acid, and stearic acid. The intracellular lipid accumulation was confirmed by oil red O staining. Blocking of STAT3 activity was achieved by the pretreatment of the STAT3 inhibitor, stattic. We found that activation of STAT3 by interleukin-6 (IL-6) was mediated in the regulation of HPS expression. Treatment of unsaturated fatty acids significantly induced intracellular lipid accumulation in HepG2 cells. Moreover, the expressions of HPS were increased in unsaturated fatty acid-treated HepG2 cells, as compared with saturated fatty acid-treated groups. Also, the expression of HPS induced by OLA was blocked by the inhibition of STAT3 activity. Furthermore, we found that deletion of HPS by small interfering ribonucleic acid transfection decreased the protective effect of OLA on cell viability. Taken together, we provided evidence that STAT3 plays an important role in the regulation of OLA-induced HPS expression and the increased HPS may further participate in the development of NAFLD. In addition, the increase of HPS might be involved in the protective effect of OLA on cell viability.

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