10/10/2015. Disclosure. Fatty Liver Disease Significance in Children
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1 Mixed Lineage Kinase 3 Mediates Release of C-X-C Motif Ligand 10-earing Extracellular Vesicles from lipotoxic hepatocytes 10/10/2015 Samar H. Ibrahim, Petra Hirsova, Steven F. ronk, Nathan W. Werneburg, Stephen. Harrison, Val S. Goodfellow, Harmeet Malhi & Gregory J. Gores MFMER slide-1 Disclosure Nothing to disclose 2015 MFMER slide-2 Fatty Liver Disease Significance in Children public health problem Striking increase in prevalence The most common liver disease 10% (2.5 millions) of US teens have NFLD 1,2 3% have NSH 2 59% of adolescent undergoing bariatric surgery have NFLD 3 Rapid progression of NSH to cirrhosis in pediatric patients common cause of liver transplantation in adults 1 Welsh et al., J. Pediatr Schwimmer et al., Pediatrics Xanthakos et al, Gastroenterology MFMER slide-3 1
2 Mlk3 -/- Mice are Protected gainst Dietinduced Steatohepatitis Saturated Free Fatty cid Mixed Lineage Kinase (MLK) 3 c-jun N- terminal Kinase (JNK) WT: Wild Type, Mlk: Mixed Lineage Kinase FFC: High Fat, Fructose, and Cholesterol Liver Injury & Inflammation Han et al. Science 2013 Jaeschke et al. Mol Cell 2007 Ibrahim et al. Liver Int MFMER slide-4 Hypothesis mediates obesity-induced liver injury & inflammation in NSH by promoting hepatocyte release of chemotactic EVs. s 1. Do lipotoxic hepatocytes release extracellular vesicles (EVs) by an - dependent pathway 2. Do generated hepatocyte EVs contain chemokines and induce macrophage chemotaxis 3. Is hepatoprotection against NSH in Mlk3 -/- mice associated with a reduction of hepatocyte EV release Chemokine Rich Lipotoxic EVs Lipotoxic Insult Macrophage Chemotaxis 2015 MFMER slide-5 Do lipotoxic hepatocytes release EVs by an - dependent pathway Lipotoxicity Lysophosphatidylcholine (LPC, 20 µm) 1 Extracellular vesicles Isolation by ultracentrifugation Nanoparticle tracking analysis (NT) by Nanosight NS300 inhibition Genetic: Mlk3 -/- primary mouse hepatocytes (PMH) Pharmacological: inhibitors (URMC, CLF from Califia io Inc., San Diego, C) 1 Kakisaka et al. m J Physiol Gastrointest Liver Physiol MFMER slide-6 2
3 Lipotoxic s Release EVs by an -dependent Pathway EV, Fold change EV, % of LPC induced release * p<0.05, **p< MFMER slide-7 Is there chemotactic cargo in lipotoxic EVs Mass Spectrometry (MS) Collect EVs Mass Spectrometry ±LPC CXCL10 Western blot Immunogold-electron microscopy 2015 MFMER slide-8 CXCL10 Is Highly Enriched in Lipotoxic EVs in an -dependent Manner CXCL10-Immunogold-electron microscopy Veh-WT LPC-WT LPC- mlk3 -/ MFMER slide-9 3
4 Do EVs induce macrophage chemotaxis by a CXCL10- dependent mechanism Migration assay Modified oyden chamber 4-h 10 µm pore membrane Chemoattractant (EVs, CXCL10) Migrated macrophages 2015 MFMER slide-10 Lipotoxic EVs Induce Macrophage Chemotaxis in a CXCL10-dependent Manner Migrated macrophages, % ***p< MFMER slide-11 Is hepatoprotection against NSH in Mlk3 -/- mice associated with reduction in hepatocytes EVs release Mice: C57L/6J wild type and Mlk3 -/- mice Diet: FFC 1 & Chow diet for 6 months Plasma LT level measurement by a veterinary chemistry analyzer CXCL10 In mouse plasma EVs by ELIS 1 Charlton et al. m J Physiol Gastrointest Liver Physiol MFMER slide-12 4
5 Mlk3 -/- in a Dietary NSH Mouse Model Protects against Liver Injury by Reducing EV Release CXCL10 plasma EVs 60 * * LT (U/L) EVs CXCL10, pg/ml C 0 WT Mlk3 -/- WT Mlk3 -/- Chow FFC Macrophage marker * p<0.05, * *p<0.01, ***p< MFMER slide-13 Conclusion Lipotoxic Insult CXCL10 Rich Lipotoxic EVs Inhibitors (URMC & CLF Califia io Inc., San Diego, C) CXCR3 Macrophage Chemotaxis 2015 MFMER slide-14 cknowledgement Dr. Gores and laboratory members Center for Clinical and Translational Science (CCaTS), KL2 program Mayo Center for Cell Signaling in Gastroenterology, Pilot and Feasibility program Pediatric Gastroenterology Division 2015 MFMER slide-15 5
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