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Alcoholic Hepatitis
Christian Doppler Research Laboratory for Gut Inflammation
Medical University Innsbruck
Herbert Tilg
Overview
Background I:• Alcoholic steatohepatitis (ASH) is a severe and often
life-threatening disease
Background II:• Treatment of this disease is still not satisfactory
although corticosteroids show some efficacy in certain patient groups
Background III:• Immunopathogenesis better understood
• Pro-inflammatory cytokines play a critical role
• New-anti-inflammatory strategies needed
Abnormal production ofcytokines/mediators that
regulate inflammatory responses
PRO-
inflammatory
ANTI-
inflammatory
Alcoholic steatohepatitis (ASH) -a prototypic „cytokine-driven“ disease
Chronic Alcoholic Liver Disease
Modulating influence,e.g. Endotoxaemia
Kupffer Cell
Activation of
Pro-inflammatory Cytokines
INFLAMMATORY RESPONSE
HEPATOCYTE INJURY
IL-8 production
NeutrophilRecruitment
Neutrophilactivation
Pathophysiology of ASH
• Fever (typicallymodest)
• Hepatomegaly• Jaundice• Anorexia• Coagulopathy
• Encephalopathy• Leukocytosis
(correlates withseverity of hepatocyte injury)
• AST/ALT < 400 IU/L
Clinical and laboratory signs of ASH
• Polymorphisms in alcohol-metabolizingenzymes (?)
• Obesity• Exposure to other hepatotoxins (e.g.
acetaminophen)• Hepatitis C virus infection
Aggravating factors: risk factors forserious liver damage
• Clinical and laboratory features oftenadequate for diagnosis
• Biopsy:– (i) in patients who have evidence of liver
failure and high transaminases (> 400 IU/L)– (ii) more than one type of liver disease (e.g.
hepatitis C)– (iii) clinical studies
Diagnosis of ASH
• Defines severity and mortality risk• DF = (4.6 x (prothrombin time - control PT)
+ (serum bilirubin))• DF > 32 associated with high short-term
mortality
Discriminant Function Formula (DF)(Maddrey Score)
• 320 patients with severe ASH and steroidtreatment studied
• Model combines six reproduciblevariables: age, renal insufficiency, albumin, prothrombin time, bilirubin and evolution of bilirubin at day 7
• Area under the receiver operatingcharacteristic curve (AUROC) higher thanChild-Pugh classification, MELD and Glasgow scores … a better score?
New scores: how to assess severity?The Lille Model (Hepatology 2007)
• Maddrey• Glasgow• Lille• MELD• Child-Pugh
• … we do not know!
Which Clinical Score should be used?
• Treatment of alcohol withdrawal(benzodiazepines)
• Administration of fluid, calories, vitamins(vitamin K, thiamine, folate) and minerals
• Airway protection (encephalopathy)• Managment of ascites (paracentesis,
cultures)
General Management (1)
• Prompt antibiotic treatment in case of proven infection
• Fresh frozen plasma (only if activehemorrhage)
• Nutritional therapy, correction of pre-existing protein calorie malnutrition
General Management (1)
• Mortality in severe ASH: 30-50%
• Current therapeutic options – Corticosteroids:
• Daures et al, Gastroenterol Clin Biol 1991 • Ramond et al, NEJM 1992; Christensen et al, GUT 1995• Imperiale et al, Ann Intern Med 1990• Mathurin P et al, J Hepatol 2002• Rambaldi A et al. APT 2008
– Pentoxifylline:?• Shakil et al, Gastroenterology 2000• Louvet A et al, J Hepatol 2008
Treatment of ASH
• Most intensively studied treatment option(15 controlled trials)
• Several controlled trials produced variable results
• Meta-analyses to date failed to show a clear benefit of such therapies(heterogeneity of studies!)
Corticosteroids in ASH
• 238 patients studied; 6-months survival as end-point
• Early change in bilirubin levels (ECBL) at 7 days(defined as levels lower than at treatment start) was observed in 73%
• After 6-months survival of patients with ECBL was 83% vs 23%
• ECBL had the most important prognosticvalue
• Treatment reconsideration on day 7?
Predictive parameters for steroid response?Early change in bilirubin levels
Mathurin P, Hepatology 2003
• Randomized trials published before July 2007• 15 trials, 721 patients; overall mortality rate 40%• 12/15 trials at risk of bias• Corticosteroids did not reduce mortality
compared to placebo or no intervention• Benefit: DF > 32, encephalopathy?• Conclusion: current evidence base of mainly
heterogenous with high bias risk trials does notsupport the use of corticosteroids in alcoholichepatitis!
Corticosteroids in ASH: Recent meta-analysisRambaldi A et al, APT 2008
• ECBL• DF > 32 and encephalopathy• Mortality in steroid-treated patients still
high (up to 40%)• 40 mg Prednisolone daily for 4 weeks
and then tapering• Prednisolone preferred to prednisone
(requires conversion to prednisolone in the liver)
Which patient may benefit from Corticosteroids?
• Evaluated in many clinical trials• Several studies have reported
improvement in liver function and histology• Protein should not be restricted in patients
with alcoholic hepatitis (use as tolerated)• In case of encephalopathy, use branched-
chain amino acids
Nutritional Therapy in ASH
Steroids versus Enteral Nutrition:Effects on Survival
Cabre et al, Hepatology 2000
• Nuclear factor-erythroid 2-related factor 2 (Nrf2): essential transcription factorprotecting cells against oxidative stress
• Nrf2 -/- mice are extremely sensitive against ethanol and die rapidly of liverfailure
• Activation of TNFα, IL-6 and Stat3• Central role for Nrf2 in the protection
against ethanol-induced liver injury
Nrf2 prevents alcohol-induced fulminant liver injuryLamle J et al, Gastroenterology 2008
• 101 patients; antioxidants versus steroids• Primary endpoint 30-day mortality• At 30-days 16 deaths (30%) in the steroid
group versus 22 deaths (46%) in theantioxidant group (P=0.05)
• Odds of dying by 30 days 2.4 greaterfor patients on antioxidants
• Survival advantage lost at 1 year follow-up
Antioxidants vs Corticosteroids in ASHPhillips et al, J Hepatol 2006
• N-acetyl cysteine for 1 week; vitamins A-E, biotin, selenium, zinc, manganese, copper, folic acid and Coenzyme Q for 6 months
• 36 received active drug, 34 placebo (all steroids)
• Predictors of survival: initial bilirubin, whitecell count, and age
• NO effect on 6-month survival
A randomized trial of antioxidants aloneor with corticosteroids in ASH
Stewart et al, J Hepatol 2007
• Transition into clinical reality?• Pentoxifylline: A cytokine modulating
drug?• Anti-TNF treatment: a concept loosing
its attraction?
The cytokine concept of ASH
Pathophysiological relevance of cytokinesin liver disease
Tilg H, Diehl AM. New Engl J Med 2000
• Increased serum/plasma levels of various cytokines (Steatohepatitis)
• Decreased levels after achievingclinical remission (Steatohepatitis)
• Levels correlate with mortality• Levels of TNF and TNF soluble
receptors correlate with amount of endotoxemia
Cytokine studies in patients with ASH
(A) wild-type mice, (B) TNF-R1 knockout mice, (C) wild-type miceand (D) TNF-R1 knockout mice given an ethanol diet.
E and F show inflammation and necrosis in wild-type animals fedethanol; G and H depict no inflammation or necrosis in TNF-R1-
deficient mice fed ethanol.
Role of TNF in mouse models
Survival curves for the PTX-treated (solid line) and control (dotted line) groups
Pentoxifylline in severe ASH
Akriviadis et al, Gastroenterology 2000
101 patients4-week treatmentShort-term survival:24.5% vs 46.1%
• 29 non-responders treated with PTX vs 58 matched non-responders treated withcorticosteroids alone
• PTX treatment for 1 month• No survival improvement at 2 months• Non-responders to corticosteroids do not
benefit from consecutive therapy wit PTX
Early switch to pentoxifylline in corticosteroid non-respondersLouvet A et al, J Hepatol 2008
• Aims• Clinical
– Tolerability– Adverse Effects– Biochemistry
• Cytokine Response
A single dose of Infliximab (Remicade, 5mg/Kg) in patients with Severe Alcoholic Hepatitis
Pilot study of Infliximab in severe ASH
Tilg H, J Hepatol 2003
Total bilirubin levels after Inflixmab
White blood cell counts after Infliximab
Liver cytokine mRNA expression
d0 d28
Liver Histology after Infliximab
• 10/12 patients survived (median 12 months; range 6-18)
• 2 patients died within the first monthtoo due infectious complications(staphyloccoccal infection, candidasepticemia)
Summary of our pilot study
• Prednisone 40 mg/kg + infliximab (10 mg/kg KG; weeks 0, 2 und 4)
• End-point: 2-month mortality• After inclusion of 36 patients interim analysis• 2-fold increase of death in the infliximab group
(NS)• Frequency of severe infections within 2 months
significantly higher in the infliximab/prednisonegroup
• Criticism: extremely high infliximab dose!
Infliximab in ASH: A French Mulitcentre StudyNaveau S et al, Hepatology 2004
• Randomized, placebo-controlled trial• Etanercept, twice weekly for 3 weeks• Moderate to severe AH (MELD score > 15)• Mortality 1 month: no difference• Mortality 6 months: higher in the
etanercept group (58% vs 23%)• ... End of the anti-TNF concept?
Etanercept: controlled study in ASHBoetticher NC et al, Gastroenterology 2008; 134: A-765
• Neutrophil oxidative burst and function assessedby FACS analysis in patients with cirrhosis +/-ASH
• Ex vivo studies with removal of endotoxinrestored neutrophil dysfunction (decreasedoxidative burst and increased phagocytosis)
• Endotoxin may be a driving force in neutrophildysfunction …is it more an infectious disease?
Neutrophil dysfunction in ASHMookerjee RP et al. Hepatology 2007
• ASH (n=23), normal livers (n=6)• 46 genes studied• Genes involved in fibrogenesis,
inflammatory response, and oxidativestress overexpressed
• Nicotinamide adenine dinucleotidephosphate (NADPH) oxidase weremarkedly upregulated; many targets forpotential therapies?
Colmenero J. Gastroenterology 2006
Hepatic expression of candidate genesin patients with ASH
• ASH (n=8), alcoholic steatosis (ASH, n=9), controls (n=7)
• ASH 211 differently expressed genes fromthat of controls
• ASH: claudins, osteopontin, CD209, selenoprotein, genes related to bile ductproliferation, IL-8
Seth D et al, J Hepatol 2006
Hepatic expression of candidate genesin patients with ASH
Tilg H, Day CP. Nat Clin Pract Gastroenterol Hepatol 2007
• Prevention of gut-derived endotoxemia(Antibiotics, lactobacillus)
• Inhibition of TNFαactivity (Anti-TNFantibodies, TNF receptor antagonists, Pentoxifylline)?
• Generalized inhibition of inflammation(Glucocorticoids)
• Decrease in reactiveoxygen speciesproduction: Glutathioneprodrugs (S-adenosylmethionine, betaine, choline, vitamin E, silymarin, propylthiouracil)
• Enhancing neutrophilfunction or correcting itsdefects?
• Probiotics?
Potential beneficial treatmentsin patients with severe ASH
• Common disease with high mortality and no satisfactory, established therapy
• Better understanding of immunopathogenesismay lead to new therapies targeting selectiveinflammatory pathways e.g. anti-TNFapproaches?
• More basic and clinical research urgentlyneeded in this neglected disease to definenew potential therapies
Conclusions