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STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers.

Publication ,  Journal Article
Torbenson, M; Yang, SQ; Liu, HZ; Huang, J; Gage, W; Diehl, AM
Published in: Am J Pathol
July 2002

Fatty liver is an important cause of morbidity in humans and is linked to impaired liver regeneration after liver injury, but the mechanisms for impaired liver regeneration remain unknown. In the normal liver, the interleukin (IL)-6/STAT-3 pathway is thought to play a central role in regeneration because this pathway is disrupted in IL-6-deficient mice that exhibit impaired liver regeneration after 70% partial hepatectomy (PH). To determine whether inhibition of STAT-3 is involved in fatty liver-related mitoinhibition, regenerative induction of STAT-3 was compared in normal mice and leptin-deficient ob/ob mice that have fatty livers and markedly impaired liver regeneration after PH. In both groups, two waves of STAT-3 activation were observed, the first in endothelia and the second in hepatocytes. Before PH, a significantly higher percentage of ob/ob endothelial and hepatocyte nuclei expressed phosphorylated (activated) STAT-3. After PH, phospho-STAT-3 accumulated in liver nuclei of lean mice and this response was markedly exaggerated in ob/ob mice. Moreover, a striking inverse correlation was noted between hepatocyte nuclear accumulation of phospho-STAT-3 and DNA synthesis (as assessed by bromodeoxyuridine labeling), as well as cyclin D1 mRNA induction and protein expression. In contrast, STAT-3 activation was positively correlated with p21 protein expression in both groups of mice. Because these results link exaggerated STAT-3 activation with impaired hepatocyte proliferation, STAT-3 inhibition cannot be a growth-arrest mechanism in ob/ob fatty livers. Rather, hyperinduction of this factor may promote mitoinhibition by up-regulating mechanisms that impede cell cycle progression.

Duke Scholars

Published In

Am J Pathol

DOI

ISSN

0002-9440

Publication Date

July 2002

Volume

161

Issue

1

Start / End Page

155 / 161

Location

United States

Related Subject Headings

  • rho GTP-Binding Proteins
  • Up-Regulation
  • Trans-Activators
  • Tissue Distribution
  • STAT3 Transcription Factor
  • Reference Values
  • Postoperative Period
  • Pathology
  • Mice, Inbred C57BL
  • Mice
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Torbenson, M., Yang, S. Q., Liu, H. Z., Huang, J., Gage, W., & Diehl, A. M. (2002). STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers. Am J Pathol, 161(1), 155–161. https://doi.org/10.1016/S0002-9440(10)64167-3
Torbenson, Michael, Shi Qi Yang, Hui Zhi Liu, Jiawen Huang, Wesley Gage, and Anna Mae Diehl. “STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers.Am J Pathol 161, no. 1 (July 2002): 155–61. https://doi.org/10.1016/S0002-9440(10)64167-3.
Torbenson M, Yang SQ, Liu HZ, Huang J, Gage W, Diehl AM. STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers. Am J Pathol. 2002 Jul;161(1):155–61.
Torbenson, Michael, et al. “STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers.Am J Pathol, vol. 161, no. 1, July 2002, pp. 155–61. Pubmed, doi:10.1016/S0002-9440(10)64167-3.
Torbenson M, Yang SQ, Liu HZ, Huang J, Gage W, Diehl AM. STAT-3 overexpression and p21 up-regulation accompany impaired regeneration of fatty livers. Am J Pathol. 2002 Jul;161(1):155–161.
Journal cover image

Published In

Am J Pathol

DOI

ISSN

0002-9440

Publication Date

July 2002

Volume

161

Issue

1

Start / End Page

155 / 161

Location

United States

Related Subject Headings

  • rho GTP-Binding Proteins
  • Up-Regulation
  • Trans-Activators
  • Tissue Distribution
  • STAT3 Transcription Factor
  • Reference Values
  • Postoperative Period
  • Pathology
  • Mice, Inbred C57BL
  • Mice