H2S-induced S-sulfhydration of pyruvate carboxylase contributes to gluconeogenesis in liver cells

Youngjun Ju, Ashley Untereiner, Lingyun Wu, Guangdong Yang

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Background Cystathionine gamma-lyase (CSE)-derived hydrogen sulfide (H2S) possesses diverse roles in the liver, affecting lipoprotein synthesis, insulin sensitivity, and mitochondrial biogenesis. H2S S-sulfhydration is now proposed as a major mechanism for H2S-mediated signaling. Pyruvate carboxylase (PC) is an important enzyme for gluconeogenesis. S-sulfhydration regulation of PC by H2S and its implication in gluconeogenesis in the liver have been unknown. Methods Gene expressions were analyzed by real-time PCR and western blotting, and protein S-sulfhydration was assessed by both modified biotin switch assay and tag switch assay. Glucose production and PC activity was measured with coupled enzyme assays, respectively. Results Exogenously applied H2S stimulates PC activity and gluconeogenesis in both HepG2 cells and mouse primary liver cells. CSE overexpression enhanced but CSE knockout reduced PC activity and gluconeogenesis in liver cells, and blockage of PC activity abolished H2S-induced gluconeogenesis. H2S had no effect on the expressions of PC mRNA and protein, while H2S S-sulfhydrated PC in a dithiothreitol-sensitive way. PC S-sulfhydration was significantly strengthened by CSE overexpression but attenuated by CSE knockout, suggesting that H2S enhances glucose production through S-sulfhydrating PC. Mutation of cysteine 265 in human PC diminished H2S-induced PC S-sulfhydration and activity. In addition, high-fat diet feeding of mice decreased both CSE expression and PC S-sulfhydration in the liver, while glucose deprivation of HepG2 cells stimulated CSE expression. Conclusions CSE/H2S pathway plays an important role in the regulation of glucose production through S-sulfhydrating PC in the liver. General significance Tissue-specific regulation of CSE/H2S pathway might be a promising therapeutic target of diabetes and other metabolic syndromes.

Original languageEnglish (US)
Pages (from-to)2293-2303
Number of pages11
JournalBiochimica et Biophysica Acta - General Subjects
Volume1850
Issue number11
DOIs
StatePublished - Nov 5 2015
Externally publishedYes

Fingerprint

Pyruvate Carboxylase
Gluconeogenesis
Liver
Glucose
Assays
Hep G2 Cells
Cystathionine gamma-Lyase
Switches
Hydrogen Sulfide
Dithiothreitol
Protein S
Enzyme Assays
High Fat Diet
Organelle Biogenesis
Enzymes
Nutrition
Medical problems
Biotin

Keywords

  • CSE
  • Gluconeogenesis
  • H<inf>2</inf>S
  • PC
  • S-sulfhydration

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology
  • Medicine(all)

Cite this

H2S-induced S-sulfhydration of pyruvate carboxylase contributes to gluconeogenesis in liver cells. / Ju, Youngjun; Untereiner, Ashley; Wu, Lingyun; Yang, Guangdong.

In: Biochimica et Biophysica Acta - General Subjects, Vol. 1850, No. 11, 05.11.2015, p. 2293-2303.

Research output: Contribution to journalArticle

Ju, Youngjun ; Untereiner, Ashley ; Wu, Lingyun ; Yang, Guangdong. / H2S-induced S-sulfhydration of pyruvate carboxylase contributes to gluconeogenesis in liver cells. In: Biochimica et Biophysica Acta - General Subjects. 2015 ; Vol. 1850, No. 11. pp. 2293-2303.
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T1 - H2S-induced S-sulfhydration of pyruvate carboxylase contributes to gluconeogenesis in liver cells

AU - Ju, Youngjun

AU - Untereiner, Ashley

AU - Wu, Lingyun

AU - Yang, Guangdong

PY - 2015/11/5

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N2 - Background Cystathionine gamma-lyase (CSE)-derived hydrogen sulfide (H2S) possesses diverse roles in the liver, affecting lipoprotein synthesis, insulin sensitivity, and mitochondrial biogenesis. H2S S-sulfhydration is now proposed as a major mechanism for H2S-mediated signaling. Pyruvate carboxylase (PC) is an important enzyme for gluconeogenesis. S-sulfhydration regulation of PC by H2S and its implication in gluconeogenesis in the liver have been unknown. Methods Gene expressions were analyzed by real-time PCR and western blotting, and protein S-sulfhydration was assessed by both modified biotin switch assay and tag switch assay. Glucose production and PC activity was measured with coupled enzyme assays, respectively. Results Exogenously applied H2S stimulates PC activity and gluconeogenesis in both HepG2 cells and mouse primary liver cells. CSE overexpression enhanced but CSE knockout reduced PC activity and gluconeogenesis in liver cells, and blockage of PC activity abolished H2S-induced gluconeogenesis. H2S had no effect on the expressions of PC mRNA and protein, while H2S S-sulfhydrated PC in a dithiothreitol-sensitive way. PC S-sulfhydration was significantly strengthened by CSE overexpression but attenuated by CSE knockout, suggesting that H2S enhances glucose production through S-sulfhydrating PC. Mutation of cysteine 265 in human PC diminished H2S-induced PC S-sulfhydration and activity. In addition, high-fat diet feeding of mice decreased both CSE expression and PC S-sulfhydration in the liver, while glucose deprivation of HepG2 cells stimulated CSE expression. Conclusions CSE/H2S pathway plays an important role in the regulation of glucose production through S-sulfhydrating PC in the liver. General significance Tissue-specific regulation of CSE/H2S pathway might be a promising therapeutic target of diabetes and other metabolic syndromes.

AB - Background Cystathionine gamma-lyase (CSE)-derived hydrogen sulfide (H2S) possesses diverse roles in the liver, affecting lipoprotein synthesis, insulin sensitivity, and mitochondrial biogenesis. H2S S-sulfhydration is now proposed as a major mechanism for H2S-mediated signaling. Pyruvate carboxylase (PC) is an important enzyme for gluconeogenesis. S-sulfhydration regulation of PC by H2S and its implication in gluconeogenesis in the liver have been unknown. Methods Gene expressions were analyzed by real-time PCR and western blotting, and protein S-sulfhydration was assessed by both modified biotin switch assay and tag switch assay. Glucose production and PC activity was measured with coupled enzyme assays, respectively. Results Exogenously applied H2S stimulates PC activity and gluconeogenesis in both HepG2 cells and mouse primary liver cells. CSE overexpression enhanced but CSE knockout reduced PC activity and gluconeogenesis in liver cells, and blockage of PC activity abolished H2S-induced gluconeogenesis. H2S had no effect on the expressions of PC mRNA and protein, while H2S S-sulfhydrated PC in a dithiothreitol-sensitive way. PC S-sulfhydration was significantly strengthened by CSE overexpression but attenuated by CSE knockout, suggesting that H2S enhances glucose production through S-sulfhydrating PC. Mutation of cysteine 265 in human PC diminished H2S-induced PC S-sulfhydration and activity. In addition, high-fat diet feeding of mice decreased both CSE expression and PC S-sulfhydration in the liver, while glucose deprivation of HepG2 cells stimulated CSE expression. Conclusions CSE/H2S pathway plays an important role in the regulation of glucose production through S-sulfhydrating PC in the liver. General significance Tissue-specific regulation of CSE/H2S pathway might be a promising therapeutic target of diabetes and other metabolic syndromes.

KW - CSE

KW - Gluconeogenesis

KW - H<inf>2</inf>S

KW - PC

KW - S-sulfhydration

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