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Hepatitis B Virus DNA Integration and Clonal Expansion of Hepatocytes in the Chronically Infected Liver. Viruses 2021; 13:v13020210. [PMID: 33573130 PMCID: PMC7911963 DOI: 10.3390/v13020210] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/19/2021] [Accepted: 01/21/2021] [Indexed: 02/07/2023] Open
Abstract
Human hepatitis B virus (HBV) can cause chronic, lifelong infection of the liver that may lead to persistent or episodic immune-mediated inflammation against virus-infected hepatocytes. This immune response results in elevated rates of killing of virus-infected hepatocytes, which may extend over many years or decades, lead to fibrosis and cirrhosis, and play a role in the high incidence of hepatocellular carcinoma (HCC) in HBV carriers. Immune-mediated inflammation appears to cause oxidative DNA damage to hepatocytes, which may also play a major role in hepatocarcinogenesis. An additional DNA damaging feature of chronic infections is random integration of HBV DNA into the chromosomal DNA of hepatocytes. While HBV DNA integration does not have a role in virus replication it may alter gene expression of the host cell. Indeed, most HCCs that arise in HBV carriers contain integrated HBV DNA and, in many, the integrant appears to have played a role in hepatocarcinogenesis. Clonal expansion of hepatocytes, which is a natural feature of liver biology, occurs because the hepatocyte population is self-renewing and therefore loses complexity due to random hepatocyte death and replacement by proliferation of surviving hepatocytes. This process may also represent a risk factor for the development of HCC. Interestingly, during chronic HBV infection, hepatocyte clones detected using integrated HBV DNA as lineage-specific markers, emerge that are larger than those expected to occur by random death and proliferation of hepatocytes. The emergence of these larger hepatocyte clones may reflect a survival advantage that could be explained by an ability to avoid the host immune response. While most of these larger hepatocyte clones are probably not preneoplastic, some may have already acquired preneoplastic changes. Thus, chronic inflammation in the HBV-infected liver may be responsible, at least in part, for both initiation of HCC via oxidative DNA damage and promotion of HCC via stimulation of hepatocyte proliferation through immune-mediated killing and compensatory division.
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El-Lakkany NM, El-Maadawy WH, Seif El-Din SH, Hammam OA, Mohamed SH, Ezzat SM, Safar MM, Saleh S. Rosmarinic acid attenuates hepatic fibrogenesis via suppression of hepatic stellate cell activation/proliferation and induction of apoptosis. ASIAN PAC J TROP MED 2017. [PMID: 28647181 DOI: 10.1016/j.apjtm.2017.05.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To investigate the antifibrotic role of rosmarinic acid (RA), a natural polyphenolic compound, on HSCs activation/proliferation and apoptosis in vitro and in vivo. METHODS The impact of RA on stellate cell line (HSC-T6) proliferation, activation and apoptosis was assessed along with its safety on primary hepatocytes. In vivo, rats were divided into: (i) normal; (ii) thioacetamide (TAA)-intoxicated rats for 12 weeks; (iii) TAA + silymarin or (iv) TAA + RA. At the end of experiment, liver functions, oxidative stress, inflammatory and profibrogenic markers, tissue inhibitor metalloproteinases type-1 (TIMP-1) and hydroxyproline (HP) levels were evaluated. Additionally, liver histopathology and immunohistochemical examinations of alpha-smooth muscle actin (α-SMA), caspase-3 and proliferation cellular nuclear antigen (PCNA) were determined. RESULTS RA exhibited anti-proliferative effects on cultured HSCs in a time and concentration dependent manner showing an IC50 of 276 μg/mL and 171 μg/mL for 24 h and 48 h, respectively, with morphological reversion of activated stellate cell morphology to quiescent form. It significantly improved ALT, AST, oxidative stress markers and reduced TIMP-1, HP levels, inflammatory markers and fibrosis score (S1 vs S4). Furthermore, reduction in α-SMA plus elevation in caspase-3 expressions of HSCs in vitro and in vivo associated with an inhibition in proliferation of damaged hepatocytes were recorded. CONCLUSIONS RA impeded the progression of liver fibrosis through inhibition of HSCs activation/proliferation and induction of apoptosis with preservation of hepatic architecture.
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Affiliation(s)
- Naglaa M El-Lakkany
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba P.O. Box 30, Giza 12411, Egypt.
| | - Walaa H El-Maadawy
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba P.O. Box 30, Giza 12411, Egypt
| | - Sayed H Seif El-Din
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba P.O. Box 30, Giza 12411, Egypt
| | - Olfat A Hammam
- Department of Pathology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba P.O. Box 30, Giza 12411, Egypt
| | - Salwa H Mohamed
- Department of Immunology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba P.O. Box 30, Giza 12411, Egypt
| | - Shahira M Ezzat
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Marwa M Safar
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Samira Saleh
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
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Lentz S, Eversole R, McHugh Law J, Means JC. Cellular Proliferation, Cell Death, and Liver Histology in Gambusia affinis After Dietary Exposure to Benzidine and 2-Aminofluorene. Int J Toxicol 2010; 29:247-58. [DOI: 10.1177/1091581810363745] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Chronic exposure to arylamines through diet and/or smoking has been associated with genetic changes and tumorigenesis. Cellular proliferation, apoptosis, and histological changes in liver tissue were investigated in Gambusia affinis ( G affinis) after chronic dietary exposure to 6.9 mM and 0.069 mM concentrations of benzidine (BZ), 2-aminofluorene (2AF), and their combination for 4, 8, and 12 weeks, respectively. The proliferation assay indicated non–dose-dependent increases in cellular proliferation over the controls for all treatment groups at 4 and 12 weeks but not at 8 weeks except for the low dose of 2AF. The apoptosis assay showed effects in the low-dose group of 2AF and BZ at 4 weeks only. Hematoxylin/eosin staining of liver tissue revealed an increase in oval/spindle cell proliferation and altered foci formation in the treated groups compared with controls. These results demonstrate a mammalian-like response to 2AF and BZ in G affinis liver.
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Affiliation(s)
- Susan Lentz
- Western Michigan University, Kalamazoo, MI, USA
| | | | - J. McHugh Law
- College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Jay C. Means
- Western Michigan University, Kalamazoo, MI, USA
- Southern Illinois University, Carbondale, IL, USA
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Wang M, Chen M, Zheng G, Dillard B, Tallarico M, Ortiz Z, Holterman AX. Transcriptional activation by growth hormone of HNF-6-regulated hepatic genes, a potential mechanism for improved liver repair during biliary injury in mice. Am J Physiol Gastrointest Liver Physiol 2008; 295:G357-66. [PMID: 18511741 PMCID: PMC2519853 DOI: 10.1152/ajpgi.00581.2007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Growth hormone (GH) function is mediated through multiple endocrine pathways. In the liver, GH also transcriptionally activates hepatocyte nuclear factor-6 (HNF-6; OC-1), a liver-enriched transcription factor that regulates the expression of genes essential to hepatic function. We hypothesize that GH modulates hepatic function in the normal and injured liver through HNF-6 and HNF-6 target genes. CD1 mice received PBS or GH for the 1-, 7-, and 28-day course of Sham operation or bile duct ligation (BDL). Proliferation-, metabolic-, and profibrotic-specific hepatic functions were assessed with a focus on candidate HNF-6 transcriptional target genes. Confirmation of HNF-6 regulation was done by analysis of target gene expression in liver infected with recombinant adenovirus AdHNF-6 expression vectors. GH administration upregulated HNF-6 expression throughout the course of liver injury. This was associated with increased expression of HNF-6 proliferative target genes cyclin D1 and metabolic gene Cyp7A1 and downregulation of profibrogenic TGFb2R. Hepatic function improved such as enhanced hepatocyte proliferation, higher cholesterol clearance throughout the course of injury, and attenuated fibrogenic response at day 28 of BDL. GH treatment also transcriptionally increased albumin expression in an HNF-6-independent manner. This was associated with enhanced serum albumin levels. In conclusion, the GH/HNF-6 axis is a potential in vivo mechanism underlying GH diverse function in the liver to modulate the liver repair response to BDL.
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Affiliation(s)
- Minhua Wang
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Michael Chen
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Guoqiang Zheng
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Barney Dillard
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Mike Tallarico
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Zorayda Ortiz
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
| | - Ai-Xuan Holterman
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago and Department of Surgery/Pediatric Surgery, Rush University Medical Center, Chicago, Illinois
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Takashima H, Nakajima T, Moriguchi M, Sekoguchi S, Nishikawa T, Watanabe T, Katagishi T, Kimura H, Minami M, Itoh Y, Kagawa K, Okanoue T. In vivo expression patterns of survivin and its splicing variants in chronic liver disease and hepatocellular carcinoma. Liver Int 2005; 25:77-84. [PMID: 15698402 DOI: 10.1111/j.1478-3231.2004.0979.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
AIM Our aim was to clarify the significance of expression levels and post-transcriptional splicing patterns of survivin during multistep hepatocarcinogenesis and tumor progression. METHODS Using immunohistochemistry, we first elucidated the expression of survivin protein in tissues of hepatocellular carcinoma (HCC) and the adjacent non-cancerous tissues. Furthermore, we investigated survivin gene expression patterns in these tissues. RESULTS Survivin protein was expressed not only in most HCC tissues but also in some cirrhotic nodules. In non-cancerous regions, the levels of survivin mRNA increased in proportion to their stage of progression. Survivin protein was expressed mainly in periportal areas, where proliferating cells were localized. In HCC, mRNA levels of survivin and survivin Delta Ex3 correlated with high proliferative activity, whereas the levels of surviving 2B did not. DISCUSSION These findings of mRNA and protein expressions of survivin in chronically injured avers indicate that it has an important role in hepatocarcinogenesis. A lack of correlation between proliferative activity and survivin 2B mRNA levels in HCC is suggestive of a previous hypothesis that this variant decreases sruvivin function in a dominant negative manner. Thus, our data suggest different functions of these splicing variants and their important roles in tumor progression.
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Affiliation(s)
- Hidetaka Takashima
- Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto 602-8566, Japan
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Sewnath ME, Van Der Poll T, Van Noorden CJF, Ten Kate FJW, Gouma DJ. Endogenous interferon gamma protects against cholestatic liver injury in mice. Hepatology 2002. [PMID: 12447873 DOI: 10.1002/hep.1840360624] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cholestatic patients suffer from high perioperative morbidity and mortality, but the pathophysiology is still unknown. Interferon gamma (IFN-gamma) may play a role during cholestasis. Therefore, bile duct ligation (BDL) was induced in IFN-gamma alpha-chain receptor-deficient (IFN-gammaR(1)-/-) and wild-type (IFN-gammaR(1)+/+) mice. BDL elicited increased IFN-gamma messenger RNA and protein levels in the liver. One week after BDL, IFN-gammaR(1)+/+ mice showed less severe jaundice and liver injury than IFN-gammaR(1)-/- mice, as reflected by lower bilirubin and liver enzyme levels. In accordance, livers of IFN-gammaR(1)+/+ mice displayed smaller areas of necrosis by two-thirds than IFN-gammaR(1)-/- mice on histopathologic examination (P <.05), whereas mitotic activity and proliferating cell nuclear antigen (PCNA) labeling index was more than twice as high in IFN-gammaR(1)+/+ mice (P <.05). Livers of IFN-gammaR(1)+/+ mice displayed higher rates of apoptosis as indicated by DNA fragmentation rate, the number of apoptotic bodies, and poly ADP-ribose polymerase (PARP) immunostaining. BDL was not associated with lethality in IFN-gammaR(1)+/+ mice; IFN-gammaR(1)-/- mice, however, died from 10 days onward and survival after 2 weeks was 62% (10 of 16). In conclusion, these data suggest that IFN-gamma protects against liver injury during extrahepatic cholestasis by stimulation of apoptosis and subsequent proliferation of hepatocytes, leading to elegant removal of damaged hepatocytes, thus preventing necrosis and concomitant inflammatory responses.
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Affiliation(s)
- Miguel E Sewnath
- Department of Surgery, Tropical Medicine and AIDS, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Han NI, Lee YS, Choi H, Choi JY, Yun SK, Cho SH, Han JY, Yang JM, Ahn BM, Choi SW, Lee CD, Cha SB, Sun HS, Park DH. PCNA expression and electron microscopic study of acinus-forming hepatocytes in chronic hepatitis B. Korean J Intern Med 2002; 17:100-6. [PMID: 12164086 PMCID: PMC4531668 DOI: 10.3904/kjim.2002.17.2.100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND One of the major morphologic characteristics of hepatitis B is a hepatocellular regeneration which is induced by massive hepatocyte necrosis and associated with proliferative activity of hepatocytes. The purpose of this study is to document the proliferative activity of hepatocytes in various types of hepatitis B by immunohistochemical staining for proliferative cell nuclear antigen-labelling index (PCNA-LI) and electron microscopy. METHODS We studied 83 patients with hepatitis B: 11 cases of acute viral hepatitis, 24 cases of mild chronic hepatitis, 34 cases of severe chronic hepatitis with early cirrhosis and 14 cases of severe chronic hepatitis. The PCNA was tested by immunohistochemical staining using anti-PCNA antibody. Furthermore we evaluated the ultrastructure of acinus-forming hepatocytes (AFH) by electron microscopy. RESULTS The expression rate and labelling index of PCNA were 27.3% and 5.3 +/- 0.9% in acute viral hepatitis, 62.5% and 22.9 +/- 31.7% in mild chronic hepatitis, and then 47.1% and 14.1 +/- 24.2% in severe chronic hepatitis with early cirrhosis, respectively (Figure 1). By contrast, no detectable PCNA expression was noted in AFH. Electron microscopic findings showed that hepatocytes forming a rosette underwent marked degenerative changes with sinusoidal capillarization and increased fine strands of collagen fiber in portal area. CONCLUSION The proliferative activity of hepatitis B was significantly decreased in severe chronic hepatitis containing AFH. This result suggested that differences in proliferative activity was associated with hepatic cell necrosis and AFH.
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Affiliation(s)
- Nam Ik Han
- Department of Internal Medicine, Holy Family Hospital, Catholic University of Korea College of Medicine, 2 Sosa-dong, Wonmi-gu, Pucheon-City 420-717, Kyunggi-do, Korea
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Li KKW, Ng IOL, Fan ST, Albrecht JH, Yamashita K, Poon RYC. Activation of cyclin-dependent kinases CDC2 and CDK2 in hepatocellular carcinoma. LIVER 2002; 22:259-68. [PMID: 12100577 DOI: 10.1046/j.0106-9543.2002.01629.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND The cyclin-dependent kinases (CDKs) CDC2 and CDK2 are key regulators of the cell cycle. The expression of the CDK alone does not necessary reflect their true activities because they are highly regulated by post-translational mechanisms. Human hepatocellular carcinoma (HCC) is one of the most common cancers in the world, but the kinase activities of CDKs in HCC have not been examined. METHODS Here we examined the protein expression and kinase activities associated with CDC2 and CDK2 in HCC and the corresponding non-tumorous liver tissues. RESULTS CDC2 and CDK2 are activated in HCC in over 70% and 80% of the cases, respectively, but have little correlation with clinical parameters and PCNA expression. Interestingly, PCNA was readily detectable in extracts from non-tumorous liver, but more than 60% of samples contain higher concentration of PCNA in HCC than the corresponding non-tumorous tissues. CDC2 and CDK2 are generally activated in the same HCC samples, but the extent of their activation varied significantly, suggesting that the pathways leading to the activation of CDC2 and CDK2 can be regulated independently. Both positive regulators of CDK activity like cyclins and CDKs, and negative regulators of CDK activity like p21(CIP1/WAF1) and Thr14/Tyr15 phosphorylation were up-regulated in HCC. CONCLUSION CDC2 and CDK2 are activated in HCC, and this may be due to a complex interplay between the level of the cyclin, CDK, CDK inhibitors, and inhibitory phosphorylation.
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Affiliation(s)
- Kay K W Li
- Department of Biochemistry, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
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Donato MF, Arosio E, Monti V, Fasani P, Prati D, Sangiovanni A, Ronchi G, Colombo M. Proliferating cell nuclear antigen assessed by a computer-assisted image analysis system in patients with chronic viral hepatitis and cirrhosis. Dig Liver Dis 2002; 34:197-203. [PMID: 11990392 DOI: 10.1016/s1590-8658(02)80193-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Assessment of liver cell proliferation by immunodetection of proliferating cell nuclear antigen may predict regenerative potential and survival of liver and hepatocellular carcinoma risk in patients with chronic viral hepatitis. AIM To evaluate proliferating cell nuclear antigen status and its clinical significance in a large cohort of patients with chronic viral hepatitis and different degree of liver damage by a computer assisted imaging analysis system. MATERIALS Liver biopsies from 358 patients with chronic hepatitis (259 males, 49 years, 63% with hepatitis C infection, 27% with hepatitis B virus, 10% with multiple infections) were studied. METHODS Proliferating cell nuclear antigen was localised by immunoperoxidase on microwave oven pre-treated formalin-fixed, paraffin embedded sections using PC10 monoclonal antibody. Proliferating cell nuclear antigen labelling index was calculated by an automated imaging system (Immagini e Computers, Milan, Italy). RESULTS Mean proliferating cell nuclear antigen labelling index ranged from 0.1% for patients with minimal changes to 3.6% for those with cirrhosis and hepatocellular carcinoma. Overall, proliferating cell nuclear antigen labelling index was higher in males, in older patients, in multiple infections and in hepatitis C virus compared to hepatitis B virus related cases. By linear regression analysis, proliferating cell nuclear antigen labelling index correlated with older age, male gender; higher transaminase levels, hepatitis C virus, higher histological gradIng and staging: by multivariate analysis male gender, hepatitis C virus, higher grading and staging resulted as independent variables. Both hepatitis C virus or hepatitis B virus cirrhotics had similar liver cell proliferation rate but those with hepatitis B virus had higher prevalence of liver cell dysplasia with respect to those with hepatitis C virus. CONCLUSIONS Proliferating cell nuclear antigen labelling index was a reliable assay for assessing liver cell proliferation rate in patients with chronic viral hepatitis and correlated with liver disease severity
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Affiliation(s)
- M F Donato
- A.M. & A. Migliavacca Liver Center & Italian Foundation for Research on Cancer, Unit of Liver Cancer, IRCCS Maggiore Hospital, University of Milan, Italy.
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Ozer E, Ozer E, Helvaci M, Yaprak I. Hepatic expression of viral antigens, hepatocytic proliferative activity and histologic changes in liver biopsies of children with chronic hepatitis B after interferon-alpha therapy. LIVER 1999; 19:369-74. [PMID: 10533793 DOI: 10.1111/j.1478-3231.1999.tb00064.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
AIMS/BACKGROUND The purpose of the present study was to evaluate the effects of interferon-alpha (IFNalpha) treatment on necro-inflammatory changes, viral antigen expression and hepatocytic proliferation rate assessed by Ki-67 protein in liver biopsies of children with chronic hepatitis B virus (HBV) infection. METHODS The study included 18 children at prepubertal age. Histologic changes were assessed using a modified scoring system for grading of histological activity index and staging of fibrosis. The hepatocytic expression of Ki-67 and HBV antigens including HBV surface antigen (HBsAg) and HBV core antigen (HBcAg) were evaluated using a semi-quantitative immunohistochemical scoring system. RESULTS We found a significant decrease in the scores of intralobular confluent and spotty necrosis, periportal piecemeal necrosis, and in Ki-67 immunopositivity after treatment. Serologic response with clearance of HBV e antigen in 9 patients (50%) was associated with this improvement. The extent of fibrosis and scoring of portal inflammation, however, did not show any difference. HBcAg expression showed a significant decrease after treatment, whereas HBsAg expression either increased or remained unchanged. CONCLUSION We conclude that IFNalpha treatment might provide an improvement in hepatic histology with a reduction in hepatocytic injury. It might also provide a serologic response associated with a decrease in hepatocytic HBV replication.
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Affiliation(s)
- E Ozer
- Department of Pathology, Dokuz Eylül University Hospital, Izmir, Turkey
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Wu PC, Lau VK, Fang JW, Lai VC, Lai CL, Lau JY. Imbalance between cell proliferation and cellular DNA fragmentation in hepatocellular carcinoma. LIVER 1999; 19:444-51. [PMID: 10533805 DOI: 10.1111/j.1478-3231.1999.tb00076.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
AIM/BACKGROUND Hepatocellular carcinoma (HCC) is known for its rapid growth. This study was undertaken to determine the expression of proliferative markers, apoptosis (DNA fragmentation) and oncogene products known to regulate apoptosis (p53, bcl-2) in HCC. METHODS 150 Chinese patients with HCC were studied (M:F 128:22, age 14-88 years). Immunohistochemistry was employed to detect cell proliferative markers (PCNA, Ki67), and oncogene products known to regulate apoptosis (p53, bcl-2). DNA fragmentation was determined by terminal dUTP nick end labeling (TUNEL). RESULTS 98% and 95% of HCC had PCNA (median 2+) and Ki67 (median 2+) detected respectively. TUNEL labeling was detected in only a small number of tumor cells (no labeling in 11%, median 1/1000 cell labeled, range: 0-70/1000 cells). There was no correlation between TUNEL labeling and the clinical parameters (sex, age, cirrhosis, and survival) and the expression of cell proliferative markers. p53 was detected in 53% of the patients (median 1+, range: 0-4+) and bcl-2 was detected in a small proportion of tumor cells in only 13% of the HCCs (range: 0-1 +). The expression of p53 and Bcl-2 did not correlate with TUNEL labeling or the natural survival. CONCLUSIONS Cell proliferation in HCC is unmatched by apoptosis, accounting for the rapid growth of this tumor. This lack of apoptosis in HCC is unrelated to the expression of p53 or bcl-2 over-expression.
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Affiliation(s)
- P C Wu
- Department of Pathology, University of Hong Kong, Hong Kong
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Delhaye M, Louis H, Degraef C, Le Moine O, Devière J, Peny MO, Adler M, Galand P. Hepatocyte proliferative activity in human liver cirrhosis. J Hepatol 1999; 30:461-71. [PMID: 10190730 DOI: 10.1016/s0168-8278(99)80106-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND/AIMS The objective of this study was to validate, with an independent prospective cohort of patients, our previous data indicating that the proliferating cell nuclear antigen-labeling index (PCNA-LI) reflects the liver functional reserve in human cirrhosis and might have prognostic significance for patient survival. We also examined how this proliferative index is related to the expression of transforming growth factor beta1 (TGFbeta1) as a possible correlate of hepatocyte proliferative activity. METHODS The present group (n=70 patients) was similar in composition to our previous group regarding age, sex and severity of liver cirrhosis. PCNA and TGFbeta1 immunostaining were analyzed on methanol-fixed, paraffin-embedded liver biopsies. RESULTS Our data show that PCNA-LI declined significantly with worsening Child class and was negatively correlated with the Pugh score. Twenty-five patients died and 10 underwent liver transplantation during the observation period. Liver function, hepatic venous pressure gradient and hepatocyte PCNA-LI were significantly different in survivors and non-survivors. At a mean follow-up of 356 days, the patients with a PCNA-LI higher than 4.4% (the previously determined best cut-off value) had a significantly higher probability of survival than those with a PCNA-LI < or = 4.4% (0.87 vs 0.48, p=0.0009). TGFbeta1 expression in liver parenchyma correlated negatively with PCNA-LI, suggesting that this cytokine could be involved in the impaired regeneration observed in worsened liver cirrhosis. CONCLUSIONS This prospective study strengthens our previous observation that, in cirrhosis, hepatocyte proliferative activity, as evaluated by the PCNA-LI, provides information on liver functional reserve as well as on the patient's prognosis.
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Affiliation(s)
- M Delhaye
- Department of Gastroenterology, Erasme Hospital, Brussels, Belgium
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Sathar SA, Sarkar C, Nayak NC. Hepatocyctic proliferation in chronic liver disease: A study of liver biopsies using immunohistochemical localization of proliferating cell nuclear antigen. Ann Saudi Med 1997; 17:363-7. [PMID: 17369744 DOI: 10.5144/0256-4947.1997.363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- S A Sathar
- Department of Pathology, Faculty of Medicine, Kuwait, University, Kuwait
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Qian C, Idoate M, Bilbao R, Sangro B, Bruña O, Vázquez J, Prieto J. Gene transfer and therapy with adenoviral vector in rats with diethylnitrosamine-induced hepatocellular carcinoma. Hum Gene Ther 1997; 8:349-58. [PMID: 9048202 DOI: 10.1089/hum.1997.8.3-349] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
In rats with diethylnitrosamine (DENA)-induced hepatocellular carcinoma (HCC), we studied in vivo gene transfer efficiency using intraportal injections of recombinant adenovirus carrying the lacZ reporter gene (AdCMVlacZ) and the therapeutic efficacy of adenovirus-mediated transfer of the thymidine kinase gene of the herpes simplex virus (HSV-tk) followed by ganciclovir (GCV) administration. DENA was very effective in inducing HCC but also stimulated nontumor cell replication, as shown by proliferating cell nuclear antigen (PCNA) staining. The study of in vivo gene transfer efficiency in tumor-bearing rats showed that nontumor tissue and small tumor nodules were transduced effectively whereas a poor transduction rate was noted in large tumor nodules. Concerning therapeutic efficacy, three groups of rats with established HCC were studied: group A and B received intraportally recombinant adenovirus carrying HSV-tk (AdCMVtk) or AdCMVlacZ, respectively, and 2 days after GCV was given intraperitoneally for 9 days; group C received only saline. Of the rats from groups B and C, 100% and 93% respectively, exhibited multiple HCC tumor nodules at end of the study. In contrast, a complete regression of tumor was observed in 63% of animals from group A. This group showed significant elevation of serum transaminases and a diffuse hepatotoxic lesion in liver tissue; histological signs of regeneration were observed in surviving animals. Nine out of 19 rats from group A died during the treatment period. We conclude that (i) in the DENA model of HCC, tumoral cells can be destroyed in vivo by the HSV-tk/GCV system despite poor transduction of large tumor nodules, suggesting that toxic metabolites generated by nontumor cells may exert a bystander effect on tumor tissue; (ii) significant hepatoxicity and a high mortality rate occurred in HSV-tk/GCV-treated rats; these side effects appear to be due to the fact that in DENA-treated livers enhanced cell proliferation was present not only in tumor nodules but also in nontumor parenchyma, leading to GCV sensitization of both tissues; (iii) our results have implications concerning the efficacy and potential risks of the HSV-tk/GCV system in the treatment of human HCC.
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Affiliation(s)
- C Qian
- Department of Medicine, School of Medicine, University of Navarra, Pamplona, Spain
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Chapel F, Guettier C, Chastang C, Rached AA, Mathieu D, Tepper M, Beaugrand M, Trinchet JC. Needle biopsy of hepatocellular carcinoma: Assessment of prognostic contribution of histologic parameters including proliferating cell nuclear antigen labeling and correlations with clinical outcomes. Cancer 1996. [DOI: 10.1002/(sici)1097-0142(19960301)77:5<864::aid-cncr9>3.0.co;2-e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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