Abstract
Optimal management of chronic liver disease requires an understanding of aetiological factors or conditions initiating and sustaining tissue damage. Injury may derive initially from toxin or xenobiotic exposure (direct, biotransformation adducts, hypersensitivity responses or immune‐mediated mechanisms), infectious organisms, inborn errors of metabolism, or pathological accumulations of transition metals (iron or copper), endotoxins or membranocytolytic bile acids. Secondarily, cells and mediators associated with inflammation, pathological expression of major histocompatibility foci on hepatocytes and biliary epithelia, aberrant initiation of apoptosis, modification of the extracellular matrix, and depletion of natural antioxidants can each play pivotal roles. Cholestatic liver injury derived from extrahepatic mechanical obstruction or intrahepatic cholestasis (many causes) can induce membrane damage subsequent to accumulation of membranocytolytic bile acids, copper retention, and membrane peroxidation. This paper reviews contemporary issues of chronic hepatocellular injury and hepatic fibrosis with the aim of broadening the clinical perspective of treatment strategies.
References
- Alpini, G. , Phillips, J. O. & LaRusso, N. F. (1994) The biology of biliary epithelia In: The Liver: Biology and Pathobiology, 3rd edn Eds Arias I. M., Boyer J. L., Fausto N., Jakoby W. B., Schachter D. A. and Shafritz D. A. Raven Press, New York , pp 623–653. [Google Scholar]
- Andersson, M. & Sevelius, E. (1992) Circulating autoantibodies in dogs with chronic liver disease. Journal of Small Animal Practice 33, 389–394. [Google Scholar]
- Arvieux, C. , Calmus, Y. , Gane, P. , Legendre, C. , Mariani, P. , Delelo, R. , Poupon, R. & Nordunger, B. (1993) Immunogenicity of rat hepatocytes in vivo: effect of cholestasis‐induced changes in major histocompatibility complex expression. Journal of Hepatology, 18, 335–341. [DOI] [PubMed] [Google Scholar]
- Bacon, B. R. & Tavill, A. S. (1996) Hemochromatosis and the iron overload syndromes In: Hepatology: A Textbook of Liver Disease, 3rd edn Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia . pp. 1439–1472. [Google Scholar]
- Benedetti, A. , Brunelli, E. , Risicato, R. , Cilluffo, T. , Jezequel, A. M. & Orlandi, F. (1988) Subcellular changes and apoptosis induced by ethanol in rat liver. Journal of Hepatology 6, 137–143. [DOI] [PubMed] [Google Scholar]
- Bissell, M. D. & Maher, J. J. (1996) Hepatic fibrosis and cirrhosis In: Hepatology: A Textbook of Liver Disease, 3rd edn Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia , pp 506–525. [Google Scholar]
- Czaja, A. J. (1996) Autoimmune liver disease In: Hepatology: A Textbook of Liver Disease. Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia . pp. 1259–1292. [Google Scholar]
- Franco, A. , Barnaba, V. , Natali, P. , Balsano, C. , Musca, A. & Balsano, F. (1988) Expression of class I and class II major histocompatibility complex antigens on human hepatocytes. Hepatology 8, 449–454. [DOI] [PubMed] [Google Scholar]
- Friedman, S. L. (1997) Molecular mechanisms of hepatic fibrosis and principles of therapy. Journal of Gastroenterology 32, 424–430. [DOI] [PubMed] [Google Scholar]
- Ghishan, F. K. (1996) Alpharantitrypsin deficiency In: Hepatology: A Textbook of Liver Disease, 3rd edn Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia , pp 1565–1574. [Google Scholar]
- Gonzalez‐Correa, J. A. , De La Cruz, J. P. , Martin‐Aurioles, E. , Lopez‐Egea, M. A. , Ortiz, P. & Sanchez de la Cuesta, F. (1997) Effects of s‐adenosyl‐L‐methionine on hepatic and renal oxidative stress in an experimental model of acute biliary obstruction in rats. Hepatology 26, 121–127. [DOI] [PubMed] [Google Scholar]
- Hanauske‐Abel, H. M. (1996) Fibrosis: representative molecular elements, a basic concept, and emerging targets for suppressive treatment In: Hepatology: A Textbook of Liver Disease, 3rd edn Eds. Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia . pp. 465–506. [Google Scholar]
- Innes, G. K. , Nagafuchi, Y. , Fuller, B. J. & Hobbs, K. E. (1988) Increased expression of major histocompatibility antigens in the liver as a result of cholestasis. Transplantation 45, 749–752. [DOI] [PubMed] [Google Scholar]
- Kamada, T. , Hayashi, N. , Sato, N. , Kasahara, A. & Abe, H. (1986) Estimated hepatic oxygen consumption in patients with chronic liver diseases as assessed by organ reflectance spectrophotometry. Digestive Diseases and Sciences 31, 119–124. [DOI] [PubMed] [Google Scholar]
- Lobo‐Yeo, A. , Senaldi, G. , Portmann, B. , Mowat, A. P. , Mieli‐Vergani, G. & Veregani, D. (1990) Class I and class II major histocompatibility complex antigen expression on hepatocytes: a study in children with liver disease. Hepatology 12, 224–232. [DOI] [PubMed] [Google Scholar]
- Losser, M‐R. & Payen, D. (1996) Mechanisms of liver damage. Seminars in Liver Diseases 16, 356–367. [DOI] [PubMed] [Google Scholar]
- Manns, M. P. & Obermayer‐Straub, P. (1997) Cytochromes p 450 and uridine triphosphate‐glucuronosyl‐transferases; model autoantigens to study drug‐induced, virus‐induced, and autoimmune liver disease. Hepatology 26, 1054–1066. [DOI] [PubMed] [Google Scholar]
- Meyer zum Buschenfelde, K‐H. & Gerken, G. (1996) Immune mechanism in the production of liver disease In: Hepatology: A Textbook of Liver Disease. Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia , pp 1243–1258. [Google Scholar]
- Miyai, K. , Richardson, A. L. , Mayr, W. & Javitt, N. B. (1977) Subcellular pathology of rat liver in cholestasis and choleresis induced by bile salts. Laboratory Investigation 36, 249–258. [PubMed] [Google Scholar]
- Morgan, D. J. & McLean, A. J. (1991) Therapeutic implications of impaired hepatic oxygen diffusion in chronic liver disease. Hepatology 14, 1280–1282. [PubMed] [Google Scholar]
- Morgan, D. J. & McLean, A. J. (1995) Clinical pharmacokinetic and pharmacodynamic considerations in patients with liver disease. Clinical Pharmacokinetics 29, 370–391. [DOI] [PubMed] [Google Scholar]
- Oberhammer, F. A. & Roberts, R. A. (1994) Apoptosis: a widespread process involved in liver adaptation and carcinogenesis In: The Liver: Biology and Pathobiology, 3rd edn Eds Arias I. M., Boyer J. L., Fausto N., Jakoby W. B., Schachter D. A. and Shafritz D. A. Raven Press, New York , pp 1547–1556. [Google Scholar]
- Paradis, V. , Kollinger, M. , Fabre, M. , Holstege, A. , Poynard, T. & Bedossa, P. (1997) In situ detection of lipid peroxidation by‐products in chronic liver diseases. Hepatology 26, 135–142. [DOI] [PubMed] [Google Scholar]
- Pinzani, M. (1995) Novel insights into the biology and physiology of the Ito cell. Pharmacology and Therapeutics 66, 387–412. [DOI] [PubMed] [Google Scholar]
- Poitout, F. , Weiss, D. J. & Armstrong, P. J. (1997) Cell‐mediated immune responses to liver membrane protein in canine chronic hepatitis. Veterinary Immunology and Immunopathology 57, 169–178. [DOI] [PubMed] [Google Scholar]
- Pumford, N. R. , Halmes, N. C. & Hinson, J. A. (1997) Covalent binding of xenobiotics to specific proteins in the liver. Drug Metabolism Reviews 29, 39–57. [DOI] [PubMed] [Google Scholar]
- Racine‐Samson, L. , Scoazec, J‐Y. , D'Errico, A. , Fiorentino, M. , Christa, L. , Moreau, A. , Roda, C. , Grigioni, W. F. & Feldman, G. (1996) The metabolic organization of the adult human liver: a comparative study of normal, fibrotic, and cirrhotic liver tissue. Hepatology 24, 104–113. [DOI] [PubMed] [Google Scholar]
- Roberts, S. K. , Ludwig, J. & Larusso, N. F. (1997) The pathobiology of biliary epithelia. Gastroenterology 112, 269–279. [DOI] [PubMed] [Google Scholar]
- Schrumpf, E. , Fausa, O. , Elgjo, K. & Kolmannskog, F. (1988) Hepatobiliary complications of inflammatory bowel disease. Seminars in Liver Diseases 8, 201–209. [DOI] [PubMed] [Google Scholar]
- Sevelius, E. , Andersson, M. & Jonsson, L. (1994) Hepatic accumulation of alpha‐1‐antitrypsin in chronic liver disease in the dog. Journal of Comparative Pathology 111, 401–412. [DOI] [PubMed] [Google Scholar]
- Sherman, I. A. , Pappas, S. C. & Fisher, M. (1990) Hepatic microvascular changes associated with development of liver fibrosis and cirrhosis. American Journal of Physiology 258, H460–H465. [DOI] [PubMed] [Google Scholar]
- Thomas, H. C. (1988) Immunologic aspects of liver disease In: Diseases of the Liver, 6th edn Eds Schiff L. and Schiff E. R. J. B. Lippincott, Philadelphia , pp 163–185. [Google Scholar]
- Tiegs, G. & Gantner, F. (1996) Immunotoxicology of T‐cell‐dependent experimental liver injury. Experimental Toxicology and Pathology 48, 471–476. [DOI] [PubMed] [Google Scholar]
- Tran‐Thi, T. A. , Weinhold, L. , Weinstock, C. , Hoffmann, R. , Schulze‐Specking, A. , Northoff, H. & Decker, K. (1993) Production of tumor necrosis factor‐α, interleukin‐1 and interleukin‐6 in the perfused rat liver. European Cytokine Network 4, 363–370. [PubMed] [Google Scholar]
- Tribble, D. L. , Aw, T. K. & Jones, D. P. (1987) The pathophysiological significance of lipid peroxidation in oxidative cell injury. Hepatology 7, 377–387. [DOI] [PubMed] [Google Scholar]
- Vierling, J. M. (1996) Hepatobiliary complications of ulcerative colitis and Crohn's disease In: Hepatology: A Textbook of Liver Disease, 3rd edn Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia . pp. 1366–1404. [Google Scholar]
- Villeneuve, J. P. & Huet, P. M. (1987) Microcirculatory abnormalities in liver disease. Hepatology, 7, 186–187. [DOI] [PubMed] [Google Scholar]
- Weiss, D. J. , Armstrong, J. & Mruthyunjaya, A. (1995) Anti‐liver membrane protein antibodies in dogs with chronic hepatitis. Journal of Veterinary Internal Medicine 9, 267–271. [DOI] [PubMed] [Google Scholar]
- Yousef, I. M. , Bouchard, G. , Tuchweber, B. & Plaa, G. L. (1997) Monohydroxy bile acid induced cholestasis: role of biotransformation. Drug Metabolism Reviews 19, 167–181. [DOI] [PubMed] [Google Scholar]
- Zhao, M. , Laissue, J. A. & Zimmermann, A. (1997) Hepatocyte apoptosis in hepatic iron overload diseases. Histology and Histopathology 12, 367–374. [PubMed] [Google Scholar]
- Zucker, S. D. & Gollan, J. L. (1996) Wilson's disease and hepatic copper toxicosis In: Hepatology: A Textbook of Liver Disease. Eds Zakim D. and Boyer T. D. W. B. Saunders, Philadelphia , pp 1405–1439. [Google Scholar]