Cited by 232Extracellular vesicles in diseaseLiver Disease Diagnosis and TreatmentLiver physiology and pathology

Mixed lineage kinase 3 mediates release of C‐X‐C motif ligand 10–bearing chemotactic extracellular vesicles from lipotoxic hepatocytes

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Ibrahim, Samar H., Hirsova, Petra, Tomita, Kyoko, Bronk, Steven F., Werneburg, Nathan W., Harrison, Stephen A., Goodfellow, Val S., Malhi, Harmeet +1 more·2016·Hepatology

Abstract

Mixed lineage kinase 3 (MLK3) deficiency reduces macrophage‐associated inflammation in a murine model of nonalcoholic steatohepatitis (NASH). However, the mechanistic links between MLK3 activation in hepatocytes and macrophage‐driven inflammation in NASH are uncharted. Herein, we report that MLK3 mediates the release of (C‐X‐C motif) ligand 10 (CXCL10)‐laden extracellular vesicles (EVs) from lipotoxic hepatocytes, which induce macrophage chemotaxis. Primary mouse hepatocytes (PMHs) and Huh7 cells were treated with palmitate or lysophosphatidylcholine (LPC). Released EVs were isolated by differential ultracentrifugation. LPC treatment of PMH or Huh7 cells induced release of EVs, which was prevented by either genetic or pharmacological inhibition of MLK3. Mass spectrometry identified the potent chemokine, CXCL10, in the EVs, which was markedly enriched in EVs isolated from LPC‐treated hepatocytes versus untreated cells. Green fluorescent protein (GFP)‐tagged CXCL10 was present in vesicular structures and colocalized with the red fluorescent protein (RFP)‐tagged EV marker, CD63, after LPC treatment of cotransfected Huh‐7 cells. Either genetic deletion or pharmacological inhibition of MLK3 prevented CXCL10 enrichment in EVs. Treatment of mouse bone‐marrow–derived macrophages with lipotoxic hepatocyte‐derived EVs induced macrophage chemotaxis, an effect blocked by incubation with CXCL10‐neutralizing antisera. MLK3‐deficient mice fed a NASH‐inducing diet had reduced concentrations of total plasma EVs and CXCL10 containing EVs compared to wild‐type mice. Conclusions: During hepatocyte lipotoxicity, activated MLK3 induces the release of CXCL10‐bearing vesicles from hepatocytes, which are chemotactic for macrophages. (H epatology 2016;63:731–744)

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  • Hepatocytes secrete inflammatory and fibrogenic cytokines either directly, such as IL-1β and IL-18, or via extracellular vesicles containing CXCL10 and mitochondrial DNA.

    “They also secrete inflammatory and fibrogenic cytokines either directly, such as interleukin (IL)-1β and IL-18,35,36 or via extracellular vesicles containing C-X-C motif chemokine ligand (CXCL)10, a ligand for C-X-C motif chemokine receptor (CXCR)3, and mitochondrial DNA, a key TLR9 ligand.37”

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Authors
Ibrahim, S. H., Hirsova, P., Tomita, K., Bronk, S. F., Werneburg, N. W., Harrison, S. A., Goodfellow, V. S., Malhi, H., & Gores, G. J.
Affiliations
  • Mayo Clinic (US)
  • Brooke Army Medical Center, Fort Sam Houston,Houston,TX
  • Califia Bio (United States) (US)
Corresponding author
Gores, Gregory J.
Venue
Hepatology
Published
2015-12-11
Volume
63
Issue
3
Pages
731-744
ISSN
  • 0270-9139 (ISSN-L)
  • 1527-3350
OpenAlex
W2146229869
Cited by
232
References
41
Citations by year
2026: 7 · 2025: 11 · 2024: 22 · 2023: 24 · 2022: 34 · 2021: 29 · 2020: 37 · 2019: 23 · 2018: 19 · 2017: 14 · 2016: 10 · 2015: 1
FWCI
6.37
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Mayo Clinic
  • National Institutes of Health (KL2TR000136, DK97178)
  • Center for Cell Signaling in Gastroenterology, Mayo Clinic (P30 DK084567)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K08DK097178, DK-41876, R37DK041876, R01DK041876, P30DK084567, DK 97178)
  • National Center for Advancing Translational Sciences
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
Keywords
MLK3, CXCL10, extracellular vesicles, lipotoxicity, hepatocytes, macrophage chemotaxis, nonalcoholic steatohepatitis, lysophosphatidylcholine, palmitate, chemokine secretion, CD63
MeSH terms
Extracellular Vesicles, Mitogen-Activated Protein Kinase Kinase Kinase 11, Animals, Chemotaxis, Disease Models, Animal, Humans, Liver, Macrophages, Signal Transduction, MAP Kinase Kinase Kinases, Hepatocytes, Cell Line, Tumor, Mice, Chemokine CXCL10, Non-alcoholic Fatty Liver Disease

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