Liver fibrosis progression in HIV/hepatitis C virus coinfected patients with normal aminotransferases levels / Progressão da fibrose hepática em portadores de coinfecção HIV/vírus da hepatite C com níveis de aminotransferases normais

INTRODUCTION: Approximately 30% of hepatitis C virus (HCV) monoinfected patients present persistently normal alanine aminotransferase (ALT) levels. Most of these patients have a slow progression of liver fibrosis. Studies have demonstrated the rate of liver fibrosis progression in hepatitis C virus-human immunodeficiency virus (HCV-HIV) coinfected patients is faster than in patients infected only by HCV. Few studies have evaluated the histological features of chronic hepatitis C in HIV-infected patients with normal ALT levels. METHODS: HCV-HIV coinfected patients (HCV-RNA and anti-HIV positive) with known time of HCV infection (intravenous drugs users) were selected. Patients with hepatitis B surface antigen (HBsAg) positive or hepatitis C treatment before liver biopsy were excluded. Patients were considered to have a normal ALT levels if they had at least 3 normal determinations in the previous 6 months prior to liver biopsy. All patients were submitted to liver biopsy and METAVIR scale was used. RESULTS: Of 50 studied patients 40 (80%) were males. All patients were treated with antiretroviral therapy. The ALT levels were normal in 13 (26%) patients. HCV-HIV co-infected patients with normal ALT levels had presented means of the liver fibrosis stages (0.77±0.44 versus 1.86±1.38; p<0.001) periportal inflammatory activity (0.62±0.77 versus 2.24±1.35; p<0.001) and liver fibrosis progression rate (0.058±0.043 fibrosis unit/year versus 0.118±0.102 fibrosis unit/year) significantly lower as compared to those with elevated ALT. CONCLUSIONS: HCV-HIV coinfected patients with persistently normal ALTs showed slower progression of liver fibrosis. In these patients the development of liver cirrhosis is improbable.

INTRODUÇÃO: Aproximadamente, 30% dos portadores de hepatite crônica C apresentam níveis de aminotransferases persistentemente normais (APNL). A maioria destes pacientes tem lenta progressão da fibrose hepática. Em portadores de coinfecção VHC-HIV, estudos têm demonstrado que a progressão da fibrose hepática é mais rápida que a observada em indivíduos infectados somente pelo VHC. Há poucos estudos que verificaram as características histológicas da hepatite crônica C em pacientes coinfectados pelo HIV APNL. MÉTODOS: Portadores de coinfecção VHC-HIV (HCV-RNA e anti-HIV positivos) com tempo de infecção pelo VHC conhecido (uso de drogas intravenosas) foram selecionados. Aqueles com hepatitis B surface antigen (HbsAg) positivo ou que tenham sido submetidos à terapia antiviral para hepatite C antes da biópsia hepática foram excluídos. Pacientes com pelo menos 3 determinações normais da ALT nos últimos 6 meses antes da biópsia hepática foram considerados como tendo APNL. Todos foram submetidos a biópsia hepática que foi classificada de acordo com a escala METAVIR. RESULTADOS: Foram incluídos 50 pacientes, 40 (80%) homens. Todos receberam terapia antirretroviral. Os níveis de ALT foram persistentemente normais em 13 (26%) pacientes. Pacientes coinfectados com APNL apresentaram menor média dos estágiosde fibrose hepática (0,77±0,44 versus 1,86±1,38; p<0,001), dos índices de atividade inflamatória periportal (0,62±0,77 versus 2,24±1,35; p<0,001) e progressão mais lenta da fibrose hepática (0,058±0,043 unidades de fibrose /ano versus 0,118±0,102 unidades de fibrose/ano) quando comparados àqueles com aminotransferases elevadas. CONCLUSÕES: Portadores de coinfecção VHC-HIV com APNL apresentam progressão mais lenta da fibrose hepática. Nesses pacientes o desenvolvimento de cirrose hepática é improvável.

Plasma myeloperoxidase activity and apolipoprotein A-1 expression in chronic hepatitis B patients

Hepatitis B virus initiates a complicated cascade process leading to chronic hepatitis B, cirrhosis, and hepatocellular carcinoma. In inflammatory situations, myeloperoxidase is released in plasma and binds to apolipoprotein A-1 in high-density lipoproteins. This study aims to evaluate the level of plasma myeloperoxidase as well as the pattern of plasma proteins in patients with chronic hepatitis B. Included in this study were 30 male subjects: 19 chronic hepatitis B patients, 6 HBV-related cirrhotic patients, and 5 healthy controls. Plasma myeloperoxidase was measured using enzyme-linked immunosorbent assay. Proteomic analysis of plasma proteins was performed by two-dimensional gel electrophoresis [2-DE] and mass spectrometry. One way ANOVAwas used for data analysis. Mean plasma myeloperoxidase levels were higher in patients with liver cirrhosis [65.5 +/- 12.5; P=0.007] and chronic hepatitis B [53.7 +/- 10.6; P=0.18] when compared with healthy subjects [45 +/- 7.6]. Moreover, a positive correlation was found between plasma myeloperoxidase levels and hepatic fibrosis stage [r=0.53, P=0.002; r=0.63, P=0.000]. Proteomic analysis showed an altered plasma protein pattern in progressive hepatitis B and down-regulation of the major apolipoprotein A-1 along with the appearance of a variety of spots noted to be apolipoprotein A-1isoforms with different molecular masses. In this study, progressive liver injury due to HBV infection correlated with higher plasma myeloperoxidase and an altered plasma apolipoprotein A-1 pattern

NADPH oxidase mediated oxidative stress in hepatic fibrogenesis / 대한간학회지

NADPH oxidase (NOX) is a multicomponent enzyme complex that generates reactive oxygen species (ROS) in response to a wide range of stimuli. ROS is involved as key secondary messengers in numerous signaling pathways, and NADPH oxidases complex has been increasingly recognized as key elements of intracellular signaling of hepatic fibrogenesis. In the liver, NADPH oxidase is functionally expressed both in the phagocytic form and in the non-phagocytic form. The non-phagocytic NADPH oxidase complex is structurally and functionally similar to the phagocytic NADPH, resulting in reduction of molecular oxygen to generate superoxide. There are six homologous NOX proteins in the non-phagocytic forms of NADPH oxidase. An emerging concept is that both phagocytic and nonphagocytic NADPH oxidase components in hepatic stellate cells (HSCs) mediate hepatic fibrosis, suggesting its potential role as a pharmacological target for anti-fibrotic therapy. The molecular components and signaling pathways of various NADPH oxidase homologues that are critical for the fibrotic activity in HSCs need to be more clearly identified.

Evaluación del paciente asintomático con alteraciones en las pruebas hepáticas / Evaluation of asymptomatic patients with abnormalities in liver function tests

La cirrosis hepática (CH) es un trastorno frecuente y con complicaciones que presentan una alta morbimortalidad. Está caracterizada por una larga fase preclínica asintomática, que puede requerir de dos décadas o más para el desarrollo de las alteraciones en la arquitectura hepática que conforman el estado cirrótico. La presencia de alteración en las pruebas hepáticas, en ausencia de síntomas y signos de enfermedad hepática, constituye un evento frecuente en la práctica médica general. Requiere de una evaluación clínica completa, con anamnesis dirigida, examen físico y estudios de laboratorio e imagenológicos; si se realizan de manera sistemática cubriendo las causas más frecuentes, su diagnóstico etiológico puede ser adecuadamente efectuado, con las consecuentes implicancias terapéuticas en algunos casos. En esta revisión se evaluarán los estudios bioquímicos actualmente disponibles para realizar un estudio clínico hepático en un paciente asintomático, su capacidad de discriminación y el estudio etiológico de las enfermedades hepáticas crónicas. Se definen además las potenciales causas hepáticas y extrahepáticas que pueden generar esta alteración.

Chronic liver diseases are a frequent medical problem and its complications are an important cause of morbidity and mortality. It is characterized by a long preclinical phase and it may take more than two decades for a liver to gain a cirrhotic architecture. In an asymptomatic patient the abnormal liver-enzyme results is a common medical problem. A good clinical history and physical examination are mandatory. If a systematic approach is adopted covering the most frequent liver disease, the cause is often apparent. In this review we discuss the battery of liver enzyme tests available in daily clinical practice, their diagnostic accuracy for the detection of liver disease and suggest an approach to abnormal tests in asymptomatic patients. The clinician should be aware of non-hepatic diseases that can cause abnormal liver enzymes.

Patients with chronic hepatitis C and normal transaminases

Hepatite C é uma doença de evolução progressiva. A maioria dos pacientes tem nível de ALT elevada e 25% apresentam níveis normais. Os com ALT normal geralmente são do gênero feminino e sem associação entre genótipo e gravidade de lesão hepática. O exame histopatológico mostra geralmente ausência de ou leve fibrose (cerca de 20% tem fibrose), embora cirrose já tenha sido relatada. Visando estimar a prevalência, características demográficas, genotípicas e anatomopatológicas em pacientes com ALT normal, realizamos um estudo de série com 68 casos com diagnóstico de hepatite C crônica. Os pacientes foram selecionados de janeiro de 1977 a abril de 2002. Encontrou-se uma prevalência de 13,8% (45,6% masculinos). A média de idade foi 39 +/- 13 anos. Predomínio de genótipo 1 (84,8%), seguido pelo 3 (8,5%) e 2 (6,7%). Encontramos fígado reacional em 52,9% das biópsias, atividade periportal de 0-1 em 85,3% e atividade periportal de 2-4 em 14,7%. Apresentaram atividade estrutural de 0 a 1 73,5% e 26,5% com atividade estrutural de 2 a 4, sendo que 29% da amostra apresentou APP > 2 e AE > 1; 73,5% não apresentaram esteatose. Nossos dados reforçam a necessidade de biópsia em pacientes com hepatite C e níveis de ALT normais.

Fibrosis Hepática: El papel de las metaloproteinasas y de TGF-β / Hepatic fibrosis: Role of matrix Metallopoteases and TGF-β

La fibrosis hepática involucra múltiples eventos celulares y moleculares que inducen un excesivo depósito de proteínas de matriz extracelular que distorsionan la arquitectura del parénquima hepático, cuya etapa final es conocida como cirrosis. El daño proviene de una variedad de causas como abuso de drogas y enfermedades virales, autoinmunes, metabólicas y colestásicas. La degradación de estas proteínas de matriz ocurre predominantemente como una consecuencia de la acción de metalopro teinasas (MMPs) que degradan sustratos colágenos y no colágenos. La degradación de la matriz en el hígado se lleva a cabo principalmente por la acción de cuatro de estas enzimas: MMP-1, MMP-2, MMP-3 y MMP-9. En el sistema fibrinolítico, las MMPs pueden ser activadas a través de un corte proteolítico por acción del activador de plasminógeno tipo urocinasa y un segundo mecanismo de activación es realizado por las mismas MMPs. La regulación para restringir la actividad puede ser a diferentes niveles; en el sistema fibrinolítico el principal regulador es el PAI- 1, molécula que bloquea la conversión de plasminógeno a plasmina y la MMP no puede ser activada. Un segundo nivel de inhibición es posible a través del TIMP, que inhibe la actividad proteolítica aun cuando las MMPs hayan sido activadas vía plasmina. Durante condiciones patológicas la sobreexpresión de estos inhibidores es dirigida por el factor de crecimiento transformante β, el cual en un padecimiento fibrótico actúa como el más importante factor adverso.

Liver fibrosis and cirrhosis involve multiple cellular and molecular events that lead to deposition of an excess of extracellular matrix proteins and increase the distortion of normal liver architecture. Etiologies include chronic viral hepatitis, alcohol abuse and drug toxicity. Degradation of these matrix proteins occurs predominantly as a result of a family of enzymes called metalloproteinases (MMPs) that specifically degrade collagenous and non collagenous substrates. Matrix degradation in the liver is due to the action of at least four of these enzymes: MMP-1, MMP-2, MMP 3 and MMP 9. In the fibrinolytic system, MMPs can be activated through proteolytic cleavage by the action of urokinase plasminogen activator; a second mechanism includes the same metalloproteinases. This activity is regulated at many levels in the fibrinolytic system. The main regulator is the PAI- 1. This molecule blocks the conversion of plasminogen into plasmin, and the MMP cannot be activated. At a second level, the inhibition is possible by binding to inhibitors called TIMP that can inhibit the proteolytic activity even when the MMPs had been previously activated by plasmin. During abnormal conditions, overexpression of these inhibitors is directed by the transforming growth factor-β that in a fibrotic disease acts as an extremely important adverse factor.

Telomerase is strongly activated in hepatocellular carcinoma but not in chronic hepatitis and cirrhosis

Telomerase is highly activated in human immortal cell lines and tumor tissues, whereas it is not activated in primary cell strains and many tumor-adjacent tissues. It is suggested that telomerase activation is one of the critical steps in malignant transformation. In the present study, the telomerase activity was investigated in hepatocellular carcinoma tissues and non-tumor liver tissues from Korean patients with chronic hepatitis and cirrhosis. Eighty two liver tissues (24 chronic hepatitis specimens, 34 cirrhosis specimens, and 24 hepatocellular carcinomas) were obtained from 23 chronic viral hepatitis patients, 19 cirrhosis patients (including 7 liver transplants), and 24 patients with hepatocellular carcinoma, of which the surrounding non-tumor liver tissues were available in 16 patients (1 chronic hepatitis and 15 cirrhosis). As negative controls, 3 normal liver tissues were included. Protein from liver specimens was purified by a detergent lysis method as described elsewhere, and telomerase activity was measured in 2 diluents of each sample (1:1 and 1:100) by a telomeric repeat amplification protocol (TRAP). Telomerase was strongly activated in 79% (19/24) of the hepatocellular carcinomas, while weakly in 8% (2/24) of the chronic hepatitis tissues and in 24% (8/34) of the cirrhosis tissues. All of 3 normal control livers showed no telomerase activation. No relationship could be observed between the enhancement of telomerase activity and tumor nature. None of the chronic heaptitis or cirrhosis patients with mild telomerase activation in the liver have developed hepatocellular carcinoma for at least 2 years of follow-up period. These results suggest that the strong enhancement of telomerase activity may be a critical part of hepatocarcinogenesis, although the exact mechanism of such high activation in hepatocellular carcinoma is not clear. In addition, further study will be necessary to clarify the reason why no telomerase activity detectable by a conventional TRAP can be seen in some hepatocellular carcinoma.

value of serum cholinesterase II in the prediction of hepatic encephalopathy in cirrhotic patients

We investigated serum cholinesterase II activity in cirrhotic patients with and without hepatic encephalopathy [n=40]. The enzyme was found to be insignificantly reduced [p>0.05] in patients without hepatic encephalopathy [n-=20]. By contrast,it was significantly reduced in patients with hepatic encephalopathy [p<0.05] in comparison with both control group and other group of patients. A significant correlation was revealed between enzyme activity and the grade of hepatic encephalopathy [p<0.01]. Statistical analysis did not reveal any significant correlation between enzyme activity and liver function tests in both groups of patients except for serum albumin in patients without hepatic encephalopathy [P < 0.05]. We assessed blood ammonia levels as well in this study, which was found to be less sensitive [35%] than serum cholinesterase activity [70%] in the diagnosis of hepatic encephalopathy. In conclusion, our results indicate that serial estimation of serum cholinesterase II activity is valuable in the prediction of hepatic encephalopathy in cirrhotic patients as the rapid fall in its level is highly suggestive of impending hepatic coma

Interferon alfa recombinante no tratamento da hepatite C crônica / Recombinant alfa interferon in the treatment of chronic hepatitis C

Introduçao. A hepatite crônica pelo vírus C apresenta tendência evolutiva para cirrose hepática e hepatocarcinoma. Tratamento, com drogas antivirais, está indicado numa tentativa de modificar a evoluçao da doença. Objetivo. Avaliar a resposta de pacientes com hepatite crônica ou cirrose pós-hepatite C ao tratamento com interferon alfa recombinante e identificar os fatores associados com boa resposta terapêutica. Métodos. Foram estudados 38 pacientes com hepatite crônica ativa ou cirrose pelo vírus C, tratados com 2,5 a 3,0MU de interfon três vezes por semana, por períodos de 6 a 12 meses. Considerou-se resposta completa e duradoura quando a ALT e AST se mantinham normais por período de seis meses após o término do tratamento, e resposta completa com recidiva naqueles em que houve elevaçao das enzimas após a suspensao da droga. Resultados. Houve normalizaçao da ALT e AST em 17 dos 38 pacientes (44,7 por cento). Deste grupo, 9/17 tiveram resposta completa e duradoura, e em 8/17 houve aumento das enzimas após a interrupçao do tratamento. Houve uma tendência de melhor resposta ao interferon nos pacientes jovens e naqueles com hepatite crônica ativa (ao invéz da cirrose). Os efeitos colaterais mais frequentes foram febre (80 por cento), mialgia (60 por cento), astenia (50 por cento), cefaléia (40 por cento) e artralgia (36 por cento). Conclusoes. O tratamento com interfon alfa recombinante mostrou resposta satisfatória e duradoura em 23 por cento dos casos, com melhor resultado em pacientes jovens e sem cirrose associada.

Volúmen corpuscular medio y relación transaminasas oxaldacética pirúvica en pacientes alcoholicos / Middle corpuscular volumen and asparate aminotransferase relation in alcholic patients

Se realizó un estudio retrospectivo en 80 pacientes alcohólicos comparándolos con un grupo de 15 pacientes cirróticos de etiología diferente al alcohol y un grupo de 40 pacientes tomado como grupo control, con objeto de observar las alteraciones en el volumen corpuscular medio (VCM) y en la relación transaminasas oxaldacética/pirúvica (SGOT-SGPT) en aquellos pacientes conocidos como alcohólicos crónicos. Encontramos una correlación significativa entre el aumento del VCM y la inversión de la relación SGOT-SGPT y el antecedente de ingestión alcohólica importante y por tiempo prolongado. Nuestros resultados muestran que estos dos parámetros son de utilidad en el diagnóstico, seguimiento y control de los pacientes alcohólicos