Cirrhosis pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:
Overview
Cirrhosis occurs due to long term liver injury which causes an imbalance between matrix production and degradation. Early disruption of the normal hepatic matrix results in its replacement by scar tissue, which in turn has deleterious effects on cell function.
Pathophysiology
- The pathological hallmark of cirrhosis is the development of scar tissue that replaces normal parenchyma, leading to blockade of portal blood flow and disturbance of normal liver function.
- The development of fibrosis requires several months, or even years, of ongoing injury.
- The stellate cell, a cell type that normally stores vitamin A, plays a pivotal role in the development of cirrhosis.
- Damage to the hepatic parenchyma leads to activation of the stellate cell, which becomes contractile (called myofibroblast) and obstructs blood flow in the circulation.
- The stellate cell secretes TGF-β1, which leads to a fibrotic response and proliferation of connective tissue.
- Connective tissue proliferation leads to the formation of extracellular matrix around hepatocytes and is composed of collagens (especially type I, III, IV), glycoprotein and proteoglycans.
- Sinusoidal endothelial cells are also important contributors of early fibrosis. Endothelial cells from a normal liver produces collagen, laminin and fibronectin.[1][2]
- The liver responds to injury with new blood vessel formation. Mediators involved in angiogenesis include:
- Platelet derived growth factor (PDGF)
- Vascular endothelial growth factor (VEGF)
- Nitric oxide
- Carbon monoxide
- Angiogenesis in cirrhosis results in the production of immature and permeable VEGF induced neo-vessels that further exacerbate liver injury. [3][4]
- Stellate cell activation leads to disturbance of the balance between matrix metalloproteinases and the naturally occurring inhibitors (TIMP 1 and 2). This is followed by matrix breakdown and replacement by connective tissue-secreted matrix.[5]
- Matrix metalloproteinase (MMP) are calcium dependent enzymes that specifically degrade collagen and non collagenous substrate.
- MMP-2 and stromyelysin-1 are produced by stellate cells.
- MMP-2 degrades collagen and stromelysin-1 degrades proteoglycan and glycoprotein.
- These mechanisms simultaneously occurring in the liver lead to fibrous tissue band (septa) and regenerative hepatocyte nodule formation, which eventually replace the entire liver architecture, leading to decreased blood flow throughout.
- Portal hypertension may develop as a consequence of cirrhosis.
- Due to portal hypertension, the spleen becomes congested, which leads to hypersplenism and increased platelet sequestration.
- Portal hypertension is responsible for the most severe complications of cirrhosis.
- Pathogenesis of cirrhosis based upon its individual cause is as follows:
- Alcoholic liver disease: Alcohol seems to injure the liver by blocking the normal metabolism of protein, fats, and carbohydrates. Patients may also have concurrent alcoholic hepatitis with fever, hepatomegaly, jaundice, and anorexia.
- Chronic hepatitis C: Infection with the hepatitis C virus causes inflammation of and low grade damage to the liver that over several decades can lead to cirrhosis.
- Non-alcoholic steatohepatitis (NASH): In NASH, fat builds up in the liver and eventually causes scar tissue. This type of hepatitis appears to be associated with diabetes, protein malnutrition, obesity, coronary artery disease, and treatment with corticosteroid medications.
- Primary sclerosing cholangitis: PSC is a progressive cholestatic disorder presenting with pruritus, steatorrhea, fat soluble vitamin deficiencies, and metabolic bone disease. There is a strong association with inflammatory bowel disease (IBD), especially ulcerative colitis.
- Autoimmune hepatitis: This disease is caused by the immunologic damage to the liver causing inflammation and eventually scarring and cirrhosis.
Pathophysiology of Alcoholic liver disease
- Ethanol metabolism in the liver is carried out mainly by two enzymes:[6]
- Both of these enzymes use NAD+ as a cofactor. Alcohol is converted to acetaldehyde and acetaldehyde is then further oxidized to acetate. Acetaldehyde is the toxic metabolite in this process.
- The metabolism of alcohol in the liver ends up producing an excess of reduced nicotinamide adenine dinucleotide (NADH). This changes the reduction-oxidation potential in the liver and inhibits key metabolic processes in the liver such as, the tricarboxylic acid cycle and the oxidation of fatty acids and thereby ends up promoting lipogenesis.[7]
- Since acetaldehyde has an electrophilic nature it can form covalent chemical bonds with proteins, lipids and DNA. These covalent bonds that are formed are extremely pathogenic, as they have the ability to alter cell environments, protein structures and they can enable DNA damage and mutation.[8][9][10][11][12][13][14][15]
- The cytochrome P450 enzymes (CYP) are a part of the microsomal ethanol oxidizing system. These are a large group of enzymes involved in numerous oxidizing reactions on different substrates. They catalyze many different reactions in order to make them in to more polar metabolites that are easier to excrete.[16]
- There is an ethanol inducible form of CYP enzymes that is working in a small amount under normal physiological conditions. This enzyme CYP2E1 is converting ethanol to acetaldehyde and then to acetate. When there is chronic alcohol abuse, there is induction of the microsomal system and there is an increase in the expression of CYP2E1. This increase in CYP2E1 expression under chronic ethanol consumption can be hazardous, as this oxidation reaction can produces many different ROS; O2-, H2O2, OH- and hydroxyethyl radical (HER).[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]
- Ethanol metabolism additionally promotes lipogenesis through the inhibition of peroxisome proliferator activated receptor α (PPAR-α) and AMP kinase, as well as the stimulation of sterol regulatory element binding protein 1, which is a membrane bound transcription factor. The sequence of all these events results in a fat storing metabolic remodeling of the liver.[33][34][35]
- Two key factors that play an important role in the inflammatory process that leads to the alcohol mediated liver injury are:[36][37]
- Endotoxin
- Gut permeability
- Endotoxin is associated to the lipopolysaccharide (LPS) component of the outer wall of gram-negative bacteria and is thought to be the key trigger in this inflammatory process.[38][39]
- Gut permeability is the factor that is either enabling or preventing the transfer of the LPS-endotoxin from the intestinal lumen into the portal circulation.[40][41]
- The fact that long term exposure to alcohol increases gut permeability has been observed in humans as LPS-endotoxin levels have been found to be elevated in patients with alcoholic liver injury.[42]
- After the entry of LPS-endotoxin in to the portal circulation it binds to the LPS-binding protein, this is a key step in the inflammatory and histopathological response to alcohol ingestion.[43]
- The LPS-LPS binding protein complex binds to the CD14 receptor on the cell surface membrane of the Kupffer cells in the liver.
- Activation of these Kupffer cells requires 3 main cellular proteins:[44]
- The TLR4 then signals activation of early growth response 1 (EGR1), which is an early gene-zinc-finger transcription factor.[47]
- The nuclear factor-kB (NF-kB) and the TLR4 adapter also play an important role in the activation of the kupffer cells.[48]
- EGR1 plays the pivotal role in lipopolysaccharide-stimulated TNF-α production.
- In mice the absence of EGR1 prevents alcohol induced liver injury.[49]
- Ethanol administration stimulates the release of mitochondrial cytochrome c and the expression of the Fas ligand, this leads to hepatic cell apoptosis mediated by the cascade-3 activation pathway.[50]
- The cumulative effect of TNF-α and Fas-mediated apoptotic signals make the hepatocytes more susceptible to injury by stimulating an increase in natural killer T cells in the liver.[51]
Pathophysiology of Portal Hypertension
Increased resistance
- Portal hypertension is related to elevation of portal vasculature resistance.
- Increased resistance in portal system can be due to both intra-hepatic and also portosystemic collaterals resistances.
- Intra-hepatic resistance
- The main factor in intra-hepatic resistance is hepatic vascular compliance, which is greatly decreased in various liver diseases, such as liver fibrosis or cirrhosis.
- Portal hypertension occurs when compliance is decreased and blood flow is increased in liver.[52]
- Pre-hepatic and post-hepatic portal hypertension are due to some secondary obstruction before or after liver vasculature, respectively.[53]
- Schistosomiasis causes both pre-sinusoidal and sinusoidal pathologies. The granulomas compress the pre-sinusoidal veins. In late stages sinusoidal resistance is also increased.[54]
- Alcoholic hepatitis causes both sinusoidal and post-sinusoidal pathologies.[55][56]
- Hepatic vascular endothelium synthesizes and secretes both vasodilator (e.g., nitric oxide, prostacyclins) and vasoconstrictor (e.g., endothelin and prostanoids) chemicals.[57][58]
- Increased resistance due to the elevation of vascular tone may be caused by excess of vasoconstrictors or lack of vasodilators.
- It is postulated that in cirrhotic liver the nitric oxide level is lower and the response to endothelin response in myofibrils is higher than normal liver.[59]
- Portosystemic collateral resistance
- Collateral formation is the consequence of portal hypertension which is also the main contributor to esophageal varices.
- The main purpose of the collaterals is to decompress and bypass the portal blood flow.
- However, the resistance in collaterals is less than the normal liver.
- Thus, portosystemic collaterals can not lead to a complete decompression.
- Portosystemic collateraling occurs between the short gastric, coronary veins, and the esophageal azygos and the intercostal veins; the superior, the middle, and the inferior hemorrhoidal veins; the paraumbilical venous plexus and the venous system of abdominal organs juxtaposed with the retroperitoneum and abdominal wall; the left renal vein, the splanchnic, the adrenal, and the spermatic veins.[60]
- Intra-hepatic resistance
Hyperdynamic circulation in portal hypertension
- Peripheral vasodilatation is the basis for decreased systemic vascular resistance and mean arterial pressure, plasma volume expansion, elevated splanchnic blood flow, and elevated cardiac index.[61]
- Systemic vasodilation
- Three main mechanisms which contribute to the peripheral vasodilation are as following:
- Increased vasodilators production in systemic circulation[62]
- Increased vasodilators production in local endothelium[63]
- Decreased vascular response to local vasoconstrictors[64]
- Three main mechanisms which contribute to the peripheral vasodilation are as following:
- Plasma volume
- There are several events which contribute to the hyperdynamic circulation such as:
- Initial vasodilatation, induced by systemic and local endothelial factors
- Subsequent plasma volume expansion[65]
- There are several events which contribute to the hyperdynamic circulation such as:
Genetics
- Certain TERT (Telomerase reverese transcriptase)gene variants resulting in reduced telomerase activity has been found to be a risk factor for sporadic cirrhosis[66]
- An uncharacterized nucleolar protein, NOL11, has a role in the pathogenesis of North American Indian childhood cirrhosis[67]
- Loss of interaction between the C-terminus of Utp4/cirhin and other SSU processome proteins may cause North American Indian childhood cirrhosis[68]
- Genes are involved in the pathogenesis of portal hypertension include the following:
Gene | OMIM number | Chromosome | Function | Gene expression in portal hypertension | Notes |
---|---|---|---|---|---|
Deoxyguanosine kinase (DGUOK) | 601465 | 2p13.1 | DNA replication | Point mutation | Mutation leads to:[69]
Homozygous missense mutation leads to:[70] |
Adenosine deaminase (ADA) | 608958 | 20q13.12 | Irreversible deamination of adenosine and deoxyadenosine in the purine catabolic pathway | Reduced[71] | Some roles in modulating tissue response to IL-13
The main effects of IL-13 are:[72]
|
Phospholipase A2 (PL2G10) | 603603 | 16p13.12 | Catalyzing the release of fatty acids from phospholipids | Reduced[71] | Identifier of PL2G10 expression: |
Cytochrome P450, family 4, subfamily F, polypeptide 3 (CYP4F3) | 601270 | 19p13.12 | Catalyzing the omega-hydroxylation of leukotriene B4 (LTB4) | Increased[71] | - |
Glutathione peroxidase 3 (GPX3) | 138321 | 5q33.1 | Reduction of glutathione which reduce:[73] | Increased[71] | Protects various organs against oxidative stress:[74] |
Leukotriene B4 (LTB4) | 601531 | 14q12 | Include:[75]
|
Mutated | Increase blood flow to target tissue (esp. heart) about 4 times more.[76] |
Prostaglandin E receptor 2 (PTGER2) | 176804 | 14q22.1 | Various biological activities in diverse tissues | Reduced[71] | - |
Endothelin (EDN1) | 131240 | 6p24.1 | Vasoconstriction[77] | Increased | The most powerful vasoconstrictor known[78] |
Endothelin receptor type A (EDNRA) | 131243 | 4q31.22-q31.23 | Vasoconstriction through binding to endothelin | Reduced[71] | Directly related to hypertension in patients[77] |
Natriuretic peptide receptor 3 (NPR3) | 108962 | 5p13.3 | Maintenance of: | Increased[71] | Released from heart muscle in response to increase in wall tension. ANP can modulate blood pressure by binding to NPR3[79] |
Cluster of differentiation 44 (CD44) | 107269 | 11p13 |
|
Reduced[71] |
|
Transforming growth factor (TGF)-β | 190180 | 19q13.2 |
|
Reduced[71] | Hyper-expressed in African-American hypertensive patients[84] |
Ectonucleoside triphosphate diphosphohydrolase 4 (ENTPD4) | 607577 | 8p21.3 | Increasing phosphatase activity in intracellular membrane-bound nucleosides | Reduced[71] | - |
ATP-binding cassette, subfamily C, member 1 (ABCC1) | 158343 | 16p13.11 | Multi-drug resistance in small cell lung cancer[85] | Reduced | - |
Associated Conditions
Portal Hypertension associated conditions | |||||||||||||||||||||||||||||||||||||||||||||||
Immunological disorders | Infections | Medication and toxins | Genetic disorders | Prothrombotic conditions | |||||||||||||||||||||||||||||||||||||||||||
• Common variable immunodeficiency syndrome[86] • Connective tissue diseases[87] • Crohn’s disease[88] • Solid organ transplant •• Renal transplantation[89] •• Liver transplantation[90] • Hashimoto's thyroiditis[91] • Autoimmune disease[92] | • Bacterial intestinal infections • Recurrent E.coli infection[93] • Human immunodeficiency virus (HIV) infection[94] • Antiretroviral therapy[95] | • Thiopurine derivatives •• Didanosine •• Azathioprine[96] •• Cis-thioguanine[97] • Arsenicals[98] • Vitamin A[99] | • Adams-Olivier syndrome[100] • Turner syndrome[101] • Phosphomannose isomerase deficiency[102] • Familial cases[103] | • Inherited thrombophilias [104] • Myeloproliferative neoplasm[104] • Antiphospholipid syndrome[104] • Sickle cell disease[105] | |||||||||||||||||||||||||||||||||||||||||||
Gross Pathology
Macroscopically, the liver may initially be enlarged, but with progression of the disease, it becomes smaller. Its surface is irregular, the consistency is firm, and the color is often yellow (if associates steatosis). Depending on the size of the nodules there are three macroscopic types: micronodular, macronodular and mixed cirrhosis.
- In the micronodular form (Laennec's cirrhosis or portal cirrhosis) regenerating nodules are under 3 mm.
- In macronodular cirrhosis (post-necrotic cirrhosis), the nodules are larger than 3 mm.
- The mixed cirrhosis consists of a variety of nodules with different sizes.
Gross Pathology
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CirrhosisOn gross pathology there are two types of cirrhosis:
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SplenomegalyOn gross pathology, diffuse enlargement and congestion of the spleen are characteristic findings of splenomegaly. |
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Esophageal VaricesOn gross pathology, prominent, congested, and tortoise veins in the lower parts of esophagus are characteristic findings of esophageal varices. |
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Cirrhosis: Gross, external view of micronodular cirrhosis
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Cirrhosis: Gross, cut section of previous one (an excellent example)
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Cirrhosis: Gross, close-up image
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Macronodular cirrhosis and hepatoma
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Cirrhosis: Gross, close-up, natural color (an excellent example)
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Cirrhosis: Gross, close-up (an excellent example)
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Cirrhosis: Gross, close-up view
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Micronodular cirrhosis: Gross, external view (an excellent example)
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Micronodular cirrhosis: Gross, close-up image
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Micronodular cirrhosis: Gross (an excellent example)
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Macronodular cirrhosis: Gross, natural color (perfect color for cirrhosis), close-up, an excellent example
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Cirrhosis with portocaval shunt: Gross, severe cirrhosis with extensive liver necrosis due to thrombosis of portocaval shunt (well shown)
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Endstage cirrhosis: Gross, natural color, close-up (an excellent example)
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Endstage cirrhosis: Gross, natural color, close-up view is an excellent example for nodules of yellow-orange liver tissue and broad irregular bands of fibrosis
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Endstage cirrhosis: Gross, natural color, close-up cut surface, very well shown nodules of yellow and necrotic opaque liver tissue with broad and irregular bands of fibrosis (an excellent example)
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Macronodular cirrhosis: Gross, natural color, external view of liver and very enlarged spleen (liver has variable size nodules up to about 2 cm)
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Macronodular cirrhosis: Gross, natural color, cut surface, large irregular bands of fibrosis with variable size liver cell nodules up to about 8 mm and all necrotic appears to be an end stage liver disease.
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Macronodular cirrhosis: Gross, natural color view of frontal sections of liver and spleen showing a contracted macronodular liver and an enlarged spleen as large as the liver
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Macronodular cirrhosis: Gross, natural color slab of liver
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Fatty change and early cirrhosis: Gross, natural color, rather close-up image showing typical fatty color, and in lighting at lower right of micrography micronodularity is evident (quite good example)
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Cirrhosis with portal vein thrombosis: Gross, natural color, sectioned liver with portal vein exposed and filled with red thrombus. A good example of end stage cirrhosis.
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Endstage cirrhosis with lobular necrosis: Gross, natural color, very close-up view (an excellent example of alcoholic cirrhosis)
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Micronodular cirrhosis: Gross, natural color view of whole liver through capsule with obvious cirrhosis (note to quite large liver)
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Micronodular cirrhosis: Gross, natural color, view of whole liver showing external surface typical cirrhotic liver (history of alcoholism)
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Lung: Idiopathic Interstitial Fibrosis: Gross, natural color, an excellent photo of lung cirrhosis (close-up view)
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Endstage cirrhosis: Gross, natural color, slice of liver. Portal vein is opened to show size and patency.
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Endstage cirrhosis: Gross, natural color, severe cirrhosis with bile stasis
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Portal Vein Thrombosis with cirrhosis: Gross, close-up, micronodular cirrhosis with portal vein thrombosis
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Lung: Hematite: Gross, natural color, external view of "pulmonary cirrhosis" with typical hematite color
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Gross, natural color of liver and stomach view from external surfaces, micronodular cirrhosis and hemorrhagic gastritis (as the surgeon would see these in natural color)
Microscopic Pathology
Microscopically, cirrhosis is characterized by regeneration nodules surrounded by fibrous septa. In these nodules, regenerating hepatocytes are disorderly disposed. Portal tracts, central veins and the radial pattern of hepatocytes are absent. Fibrous septa are important and may present inflammatory infiltrate (lymphocytes, macrophages). If it is a secondary biliary cirrhosis, biliary ducts are damaged, proliferated or distended - bile stasis. These dilated ducts contain inspissated bile which appears as bile casts or bile thrombi (brown-green, amorphous). Bile retention may be found also in the parenchyma, as the so called "bile lakes".[110]
Microscopic Pathology
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CirrhosisRobbins definition of microscopic histopathological findings in cirrhosis includes (all three is needed for diagnosis):[111] |
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Esophageal varicesThe main microscopic histopathological findings in esophageal varices are:
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Hepatic amyloidosisThe main microscopic histopathological findings in hepatic amyloidosis is amorphous extracellular pink stuff on H&E staining. |
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Congestive hepatopathyThe main microscopic histopathological findings in congestive hepatopathy (due to heart failure or Budd-Chiari syndrome) are:
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Chronic active hepatitis - Cirrhosis
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Micronodular cirrhosis
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Primary biliary cirrhosis
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References
- ↑ Maher JJ, McGuire RF (1990). "Extracellular matrix gene expression increases preferentially in rat lipocytes and sinusoidal endothelial cells during hepatic fibrosis in vivo". J. Clin. Invest. 86 (5): 1641–8. doi:10.1172/JCI114886. PMC 296914. PMID 2243137. Unknown parameter
|month=
ignored (help) - ↑ Herbst H, Frey A, Heinrichs O; et al. (1997). "Heterogeneity of liver cells expressing procollagen types I and IV in vivo". Histochem. Cell Biol. 107 (5): 399–409. PMID 9208331. Unknown parameter
|month=
ignored (help) - ↑ Lee JS, Semela D, Iredale J, Shah VH (2007). "Sinusoidal remodeling and angiogenesis: a new function for the liver-specific pericyte?". Hepatology. 45 (3): 817–25. doi:10.1002/hep.21564. PMID 17326208. Unknown parameter
|month=
ignored (help) - ↑ Rosmorduc O, Housset C (2010). "Hypoxia: a link between fibrogenesis, angiogenesis, and carcinogenesis in liver disease". Semin. Liver Dis. 30 (3): 258–70. doi:10.1055/s-0030-1255355. PMID 20665378. Unknown parameter
|month=
ignored (help) - ↑ Iredale JP. Cirrhosis: new research provides a basis for rational and targeted treatments. BMJ 2003;327:143-7.Fulltext. PMID 12869458.
- ↑ Ceni E, Mello T, Galli A (2014). "Pathogenesis of alcoholic liver disease: role of oxidative metabolism". World J. Gastroenterol. 20 (47): 17756–72. doi:10.3748/wjg.v20.i47.17756. PMC 4273126. PMID 25548474.
- ↑ You M, Crabb DW (2004). "Recent advances in alcoholic liver disease II. Minireview: molecular mechanisms of alcoholic fatty liver". Am. J. Physiol. Gastrointest. Liver Physiol. 287 (1): G1–6. doi:10.1152/ajpgi.00056.2004. PMID 15194557.
- ↑ Freeman TL, Tuma DJ, Thiele GM, Klassen LW, Worrall S, Niemelä O, Parkkila S, Emery PW, Preedy VR (2005). "Recent advances in alcohol-induced adduct formation". Alcohol. Clin. Exp. Res. 29 (7): 1310–6. PMID 16088993.
- ↑ Niemelä O (2007). "Acetaldehyde adducts in circulation". Novartis Found. Symp. 285: 183–92, discussion 193–7. PMID 17590995.
- ↑ Tuma DJ (2002). "Role of malondialdehyde-acetaldehyde adducts in liver injury". Free Radic. Biol. Med. 32 (4): 303–8. PMID 11841919.
- ↑ Tuma DJ, Casey CA (2003). "Dangerous byproducts of alcohol breakdown--focus on adducts". Alcohol Res Health. 27 (4): 285–90. PMID 15540799.
- ↑ Brooks PJ, Theruvathu JA (2005). "DNA adducts from acetaldehyde: implications for alcohol-related carcinogenesis". Alcohol. 35 (3): 187–93. doi:10.1016/j.alcohol.2005.03.009. PMID 16054980.
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- ↑ Seitz HK, Meier P (2007). "The role of acetaldehyde in upper digestive tract cancer in alcoholics". Transl Res. 149 (6): 293–7. doi:10.1016/j.trsl.2006.12.002. PMID 17543846.
- ↑ Guengerich FP, Beaune PH, Umbenhauer DR, Churchill PF, Bork RW, Dannan GA, Knodell RG, Lloyd RS, Martin MV (1987). "Cytochrome P-450 enzymes involved in genetic polymorphism of drug oxidation in humans". Biochem. Soc. Trans. 15 (4): 576–8. PMID 3678578.
- ↑ Guengerich FP, Beaune PH, Umbenhauer DR, Churchill PF, Bork RW, Dannan GA, Knodell RG, Lloyd RS, Martin MV (1987). "Cytochrome P-450 enzymes involved in genetic polymorphism of drug oxidation in humans". Biochem. Soc. Trans. 15 (4): 576–8. PMID 3678578.
- ↑ Lieber CS (1972). "Metabolism of ethanol and alcoholism: racial and acquired factors". Ann. Intern. Med. 76 (2): 326–7. PMID 5009602.
- ↑ Lieber CS, DeCarli LM (1972). "The role of the hepatic microsomal ethanol oxidizing system (MEOS) for ethanol metabolism in vivo". J. Pharmacol. Exp. Ther. 181 (2): 279–87. PMID 4402282.
- ↑ Lieber CS (1997). "Cytochrome P-4502E1: its physiological and pathological role". Physiol. Rev. 77 (2): 517–44. PMID 9114822.
- ↑ Hansson T, Tindberg N, Ingelman-Sundberg M, Köhler C (1990). "Regional distribution of ethanol-inducible cytochrome P450 IIE1 in the rat central nervous system". Neuroscience. 34 (2): 451–63. PMID 2333153.
- ↑ Donohue TM, Cederbaum AI, French SW, Barve S, Gao B, Osna NA (2007). "Role of the proteasome in ethanol-induced liver pathology". Alcohol. Clin. Exp. Res. 31 (9): 1446–59. doi:10.1111/j.1530-0277.2007.00454.x. PMID 17760783.
- ↑ Osna NA, Donohue TM (2007). "Implication of altered proteasome function in alcoholic liver injury". World J. Gastroenterol. 13 (37): 4931–7. PMC 4434615. PMID 17854134.
- ↑ Lu Y, Cederbaum AI (2008). "CYP2E1 and oxidative liver injury by alcohol". Free Radic. Biol. Med. 44 (5): 723–38. doi:10.1016/j.freeradbiomed.2007.11.004. PMC 2268632. PMID 18078827.
- ↑ Yun YP, Casazza JP, Sohn DH, Veech RL, Song BJ (1992). "Pretranslational activation of cytochrome P450IIE during ketosis induced by a high fat diet". Mol. Pharmacol. 41 (3): 474–9. PMID 1545775.
- ↑ Raucy JL, Lasker JM, Kraner JC, Salazar DE, Lieber CS, Corcoran GB (1991). "Induction of cytochrome P450IIE1 in the obese overfed rat". Mol. Pharmacol. 39 (3): 275–80. PMID 2005876.
- ↑ Woodcroft KJ, Hafner MS, Novak RF (2002). "Insulin signaling in the transcriptional and posttranscriptional regulation of CYP2E1 expression". Hepatology. 35 (2): 263–73. doi:10.1053/jhep.2002.30691. PMID 11826398.
- ↑ De Waziers I, Garlatti M, Bouguet J, Beaune PH, Barouki R (1995). "Insulin down-regulates cytochrome P450 2B and 2E expression at the post-transcriptional level in the rat hepatoma cell line". Mol. Pharmacol. 47 (3): 474–9. PMID 7700245.
- ↑ Peng HM, Coon MJ (1998). "Regulation of rabbit cytochrome P450 2E1 expression in HepG2 cells by insulin and thyroid hormone". Mol. Pharmacol. 54 (4): 740–7. PMID 9765518.
- ↑ Terelius Y, Norsten-Höög C, Cronholm T, Ingelman-Sundberg M (1991). "Acetaldehyde as a substrate for ethanol-inducible cytochrome P450 (CYP2E1)". Biochem. Biophys. Res. Commun. 179 (1): 689–94. PMID 1822117.
- ↑ Wu YS, Salmela KS, Lieber CS (1998). "Microsomal acetaldehyde oxidation is negligible in the presence of ethanol". Alcohol. Clin. Exp. Res. 22 (5): 1165–9. PMID 9726291.
- ↑ Brooks PJ (1997). "DNA damage, DNA repair, and alcohol toxicity--a review". Alcohol. Clin. Exp. Res. 21 (6): 1073–82. PMID 9309320.
- ↑ Fischer M, You M, Matsumoto M, Crabb DW (2003). "Peroxisome proliferator-activated receptor alpha (PPARalpha) agonist treatment reverses PPARalpha dysfunction and abnormalities in hepatic lipid metabolism in ethanol-fed mice". J. Biol. Chem. 278 (30): 27997–8004. doi:10.1074/jbc.M302140200. PMID 12791698.
- ↑ You M, Matsumoto M, Pacold CM, Cho WK, Crabb DW (2004). "The role of AMP-activated protein kinase in the action of ethanol in the liver". Gastroenterology. 127 (6): 1798–808. PMID 15578517.
- ↑ Ji C, Chan C, Kaplowitz N (2006). "Predominant role of sterol response element binding proteins (SREBP) lipogenic pathways in hepatic steatosis in the murine intragastric ethanol feeding model". J. Hepatol. 45 (5): 717–24. doi:10.1016/j.jhep.2006.05.009. PMID 16879892.
- ↑ Tsukamoto H, Reidelberger RD, French SW, Largman C (1984). "Long-term cannulation model for blood sampling and intragastric infusion in the rat". Am. J. Physiol. 247 (3 Pt 2): R595–9. PMID 6433728.
- ↑ Uesugi T, Froh M, Arteel GE, Bradford BU, Thurman RG (2001). "Toll-like receptor 4 is involved in the mechanism of early alcohol-induced liver injury in mice". Hepatology. 34 (1): 101–8. doi:10.1053/jhep.2001.25350. PMID 11431739.
- ↑ Wiest R, Garcia-Tsao G (2005). "Bacterial translocation (BT) in cirrhosis". Hepatology. 41 (3): 422–33. doi:10.1002/hep.20632. PMID 15723320.
- ↑ Nanji AA, Khettry U, Sadrzadeh SM (1994). "Lactobacillus feeding reduces endotoxemia and severity of experimental alcoholic liver (disease)". Proc. Soc. Exp. Biol. Med. 205 (3): 243–7. PMID 8171045.
- ↑ Adachi Y, Moore LE, Bradford BU, Gao W, Thurman RG (1995). "Antibiotics prevent liver injury in rats following long-term exposure to ethanol". Gastroenterology. 108 (1): 218–24. PMID 7806045.
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|month=
ignored (help) - ↑ Freed EF, Prieto JL, McCann KL, McStay B, Baserga SJ (2012). "NOL11, Implicated in the Pathogenesis of North American Indian Childhood Cirrhosis, Is Required for Pre-rRNA Transcription and Processing". PLoS Genet. 8 (8): e1002892. doi:10.1371/journal.pgen.1002892. PMC 3420923. PMID 22916032. Unknown parameter
|month=
ignored (help) - ↑ Freed EF, Baserga SJ (2010). "The C-terminus of Utp4, mutated in childhood cirrhosis, is essential for ribosome biogenesis". Nucleic Acids Res. 38 (14): 4798–806. doi:10.1093/nar/gkq185. PMC 2919705. PMID 20385600. Unknown parameter
|month=
ignored (help) - ↑ Mandel H, Szargel R, Labay V, Elpeleg O, Saada A, Shalata A, Anbinder Y, Berkowitz D, Hartman C, Barak M, Eriksson S, Cohen N (2001). "The deoxyguanosine kinase gene is mutated in individuals with depleted hepatocerebral mitochondrial DNA". Nat. Genet. 29 (3): 337–41. doi:10.1038/ng746. PMID 11687800.
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- ↑ <CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)>
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- ↑ <http://wellcomeimages.org/indexplus/obf_images/29/b4/13f38971164f946a97f9d32ddd93.jpg>Gallery: <"http://wellcomeimages.org/indexplus/image/L0074357.html"><"http://creativecommons.org/licenses/by/4.0> CC BY 4.0, <"https://commons.wikimedia.org/w/index.php?curid=36297209">
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