Cited by 333Liver Disease Diagnosis and TreatmentEndoplasmic Reticulum Stress and DiseaseCancer, Lipids, and Metabolism

ER Stress Drives Lipogenesis and Steatohepatitis via Caspase-2 Activation of S1P

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Kim, Ju Youn, Garcia-Carbonell, Ricard, Yamachika, Shinichiro, Zhao, Peng, Dhar, Debanjan, Loomba, Rohit, Kaufman, Randal J., Saltiel, Alan R. +1 more·2018·Cell

Abstract

Nonalcoholic fatty liver disease (NAFLD) progresses to nonalcoholic steatohepatitis (NASH) in response to elevated endoplasmic reticulum (ER) stress. Whereas the onset of simple steatosis requires elevated de novo lipogenesis, progression to NASH is triggered by accumulation of hepatocyte-free cholesterol. We now show that caspase-2, whose expression is ER-stress inducible and elevated in human and mouse NASH, controls the buildup of hepatic-free cholesterol and triglycerides by activating sterol regulatory element-binding proteins (SREBP) in a manner refractory to feedback inhibition. Caspase-2 colocalizes with site 1 protease (S1P) and cleaves it to generate a soluble active fragment that initiates SCAP-independent SREBP1/2 activation in the ER. Caspase-2 ablation or pharmacological inhibition prevents diet-induced steatosis and NASH progression in ER-stress-prone mice. Caspase-2 inhibition offers a specific and effective strategy for preventing or treating stress-driven fatty liver diseases, whereas caspase-2-generated S1P proteolytic fragments, which enter the secretory pathway, are potential NASH biomarkers.

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Crossref · 10.1016/j.cell.2018.08.020

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Authors
Kim, J. Y., Garcia-Carbonell, R., Yamachika, S., Zhao, P., Dhar, D., Loomba, R., Kaufman, R. J., Saltiel, A. R., & Karin, M.
Affiliations
  • University of California San Diego (US)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
Corresponding author
Karin, Michael
Venue
Cell
Publisher
Elsevier BV
Published
2018-09
Volume
175
Issue
1
Pages
133-145.e15
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2890819762
Cited by
333
References
59
Citations by year
2026: 16 · 2025: 45 · 2024: 48 · 2023: 49 · 2022: 49 · 2021: 49 · 2020: 49 · 2019: 24 · 2018: 4
FWCI
24.60
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • NIH
  • NCI (R01CA211794, R01CA198103, R01CA155120)
  • NIEHS (P42ES010337)
  • NHMRC (APP112227)
  • AACR-Bayer Hepatocellular Carcinoma Fellowship (16-40-44-KIMJ)
  • Diabetes Research Center Pilot and Feasibility Grant (P30DK063491)
  • Boehringer Ingelheim Fonds
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
Keywords
endoplasmic reticulum stress, nonalcoholic steatohepatitis, non-alcoholic fatty liver disease, caspase-2, site-1 protease, de novo lipogenesis, hepatic steatosis, free cholesterol accumulation, triglyceride accumulation
MeSH terms
Animals, Cholesterol, Endoplasmic Reticulum, Fatty Liver, Humans, Liver, Mice, Inbred C57BL, Serine Endopeptidases, Triglycerides, Hepatocytes, Proprotein Convertases, Lipogenesis, Mice, Sterol Regulatory Element Binding Protein 1, Caspase 2, HEK293 Cells, Endoplasmic Reticulum Stress

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