Tags

Type your tag names separated by a space and hit enter

CCAAT/enhancing binding protein beta deletion in mice attenuates inflammation, endoplasmic reticulum stress, and lipid accumulation in diet-induced nonalcoholic steatohepatitis.
Hepatology. 2007 May; 45(5):1108-17.Hep

Abstract

Nonalcoholic steatohepatitis (NASH) is characterized by steatosis, inflammation, and oxidative stress. To investigate whether the transcription factor CCAAT/Enhancer binding protein (C/EBPbeta) is involved in the development of NASH, C57BL/6J wild-type (WT) or C/EBPbeta knockout (C/EBPbeta-/-) mice were fed either a methionine and choline deficient (MCD) diet or standard chow. These WT mice fed a MCD diet for 4 weeks showed a 2- to 3-fold increase in liver C/EBPbeta messenger RNA and protein, along with increased expression of lipogenic genes peroxisome proliferators-activated receptor gamma and Fas. WT mice also showed increased levels of the endoplasmic reticulum stress pathway proteins phosphorylated eukaryotic translation initiation factor alpha, phosphorylated pancreatic endoplasmic reticulum kinase, and C/EBP homologous protein, along with inflammatory markers phosphorylated nuclear factor kappaB and phosphorylated C-jun N-terminal kinase compared to chow-fed controls. Cytochrome P450 2E1 protein and acetyl coA oxidase messenger RNA involved in hepatic lipid peroxidation were also markedly increased in WT MCD diet-fed group. In contrast, C/EBPbeta-/- mice fed a MCD diet showed a 60% reduction in hepatic triglyceride accumulation and decreased liver injury as evidenced by reduced serum alanine aminotransferase and aspartate aminotransferase levels, and by H&E staining. Immunoblots and real-time qPCR data revealed a significant reduction in expression of stress related proteins and lipogenic genes in MCD diet-fed C/EBPbeta-/- mice. Furthermore, circulating TNFalpha and expression of acute phase response proteins CRP and SAP were significantly lower in C/EBPbeta-/- mice compared to WT mice. Conversely, C/EBPbeta over-expression in livers of WT mice increased steatosis, nuclear factor-kappaB, and endoplasmic reticulum stress, similar to MCD diet-fed mice.

CONCLUSION

Taken together, these data suggest a previously unappreciated molecular link between C/EBPbeta, hepatic steatosis and inflammation and suggest that increased C/EBPbeta expression may be an important factor underlying events leading to NASH.

Authors+Show Affiliations

Department of Pediatrics, University of Colorado at Denver and Health Sciences Center, Aurora, CO 80045, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

17464987

Citation

Rahman, Shaikh Mizanoor, et al. "CCAAT/enhancing Binding Protein Beta Deletion in Mice Attenuates Inflammation, Endoplasmic Reticulum Stress, and Lipid Accumulation in Diet-induced Nonalcoholic Steatohepatitis." Hepatology (Baltimore, Md.), vol. 45, no. 5, 2007, pp. 1108-17.
Rahman SM, Schroeder-Gloeckler JM, Janssen RC, et al. CCAAT/enhancing binding protein beta deletion in mice attenuates inflammation, endoplasmic reticulum stress, and lipid accumulation in diet-induced nonalcoholic steatohepatitis. Hepatology. 2007;45(5):1108-17.
Rahman, S. M., Schroeder-Gloeckler, J. M., Janssen, R. C., Jiang, H., Qadri, I., Maclean, K. N., & Friedman, J. E. (2007). CCAAT/enhancing binding protein beta deletion in mice attenuates inflammation, endoplasmic reticulum stress, and lipid accumulation in diet-induced nonalcoholic steatohepatitis. Hepatology (Baltimore, Md.), 45(5), 1108-17.
Rahman SM, et al. CCAAT/enhancing Binding Protein Beta Deletion in Mice Attenuates Inflammation, Endoplasmic Reticulum Stress, and Lipid Accumulation in Diet-induced Nonalcoholic Steatohepatitis. Hepatology. 2007;45(5):1108-17. PubMed PMID: 17464987.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - CCAAT/enhancing binding protein beta deletion in mice attenuates inflammation, endoplasmic reticulum stress, and lipid accumulation in diet-induced nonalcoholic steatohepatitis. AU - Rahman,Shaikh Mizanoor, AU - Schroeder-Gloeckler,Jill M, AU - Janssen,Rachel C, AU - Jiang,Hua, AU - Qadri,Ishtiaq, AU - Maclean,Kenneth N, AU - Friedman,Jacob E, PY - 2007/4/28/pubmed PY - 2007/5/26/medline PY - 2007/4/28/entrez SP - 1108 EP - 17 JF - Hepatology (Baltimore, Md.) JO - Hepatology VL - 45 IS - 5 N2 - UNLABELLED: Nonalcoholic steatohepatitis (NASH) is characterized by steatosis, inflammation, and oxidative stress. To investigate whether the transcription factor CCAAT/Enhancer binding protein (C/EBPbeta) is involved in the development of NASH, C57BL/6J wild-type (WT) or C/EBPbeta knockout (C/EBPbeta-/-) mice were fed either a methionine and choline deficient (MCD) diet or standard chow. These WT mice fed a MCD diet for 4 weeks showed a 2- to 3-fold increase in liver C/EBPbeta messenger RNA and protein, along with increased expression of lipogenic genes peroxisome proliferators-activated receptor gamma and Fas. WT mice also showed increased levels of the endoplasmic reticulum stress pathway proteins phosphorylated eukaryotic translation initiation factor alpha, phosphorylated pancreatic endoplasmic reticulum kinase, and C/EBP homologous protein, along with inflammatory markers phosphorylated nuclear factor kappaB and phosphorylated C-jun N-terminal kinase compared to chow-fed controls. Cytochrome P450 2E1 protein and acetyl coA oxidase messenger RNA involved in hepatic lipid peroxidation were also markedly increased in WT MCD diet-fed group. In contrast, C/EBPbeta-/- mice fed a MCD diet showed a 60% reduction in hepatic triglyceride accumulation and decreased liver injury as evidenced by reduced serum alanine aminotransferase and aspartate aminotransferase levels, and by H&E staining. Immunoblots and real-time qPCR data revealed a significant reduction in expression of stress related proteins and lipogenic genes in MCD diet-fed C/EBPbeta-/- mice. Furthermore, circulating TNFalpha and expression of acute phase response proteins CRP and SAP were significantly lower in C/EBPbeta-/- mice compared to WT mice. Conversely, C/EBPbeta over-expression in livers of WT mice increased steatosis, nuclear factor-kappaB, and endoplasmic reticulum stress, similar to MCD diet-fed mice. CONCLUSION: Taken together, these data suggest a previously unappreciated molecular link between C/EBPbeta, hepatic steatosis and inflammation and suggest that increased C/EBPbeta expression may be an important factor underlying events leading to NASH. SN - 0270-9139 UR - https://www.unboundmedicine.com/medline/citation/17464987/CCAAT/enhancing_binding_protein_beta_deletion_in_mice_attenuates_inflammation_endoplasmic_reticulum_stress_and_lipid_accumulation_in_diet_induced_nonalcoholic_steatohepatitis_ DB - PRIME DP - Unbound Medicine ER -