
Theme Issue: Eliminating the Harm of Hepatitis B: Challenges and Breakthroughs in Basic Research
Executive Chief Editor: LI Wenhui
Hepatitis B virus (HBV) exclusively infects liver parenchymal cells and forms covalently closed circular DNA (cccDNA) within their nuclei. HBV cccDNA serves as the essential template for viral gene transcription, the sole source of progeny virus production, and the key driver of viral antigen expression, and it is the molecular basis for the persistence of HBV infection. Therefore, elimination and/or functional silencing of cccDNA is the key to eradicate chronic HBV infection. This article discusses the critical scientific issues that need to be solved during elimination of the harm of HBV infection from the perspectives of the synthesis, transcription, and clearance of cccDNA, as well as the impact of nonparenchymal cells on cccDNA, in order to provide a reference for eradicating HBV infection in the future.
Hepatitis B virus (HBV) is a unique hepatotropic DNA virus that forms covalently closed circular DNA within the nucleus of hepatocytes and can partially integrate into the host genome, establishing the molecular basis for persistent viral infection. HBV infection and replication depends on multiple hepatocyte-enriched host factors and is modulated by the hepatic microenvironment. The host achieves natural control and clearance of HBV through various mechanisms, including cytolytic elimination mediated by cellular immunity such as cytotoxic T lymphocytes and natural killer cells, innate immunity and noncytolytic clearance driven by interferons and various cytokines, and antibody-mediated protection and clearance as part of humoral immune response. In addition, intracellular restriction factors and pathways, hepatocyte turnover through division and replacement, and changes in the hepatic microenvironment (such as the increase in matrix stiffness) collectively influence the efficiency and outcome of viral control and clearance. This article clarifies and elaborates on related mechanisms, so as to deepen the understanding of HBV chronicity, spontaneous resolution, and cure and provide a theoretical basis for optimizing clinical management and developing novel therapeutic strategies.
Cure of chronic hepatitis B virus (HBV) infection is the ultimate goal in HBV-related research, and exploring potential curative pathways may help to identify key research directions. Covalently closed circular DNA (cccDNA), as the most difficult genetic material to be eliminated within the HBV replication cycle, is not only a primary impediment to achieving cure, but also a key issue for establishing an analytical framework for cure strategies. This article reviews the thinking framework of “cccDNA dynamics”, further elaborates on its core implications, and systematically discusses the main strategies to promote cccDNA decay.
HBV DNA integration (iDNA) is the core barrier that must be overcome to achieve functional cure for chronic hepatitis B (CHB) and to prevent the occurrence of hepatocellular carcinoma (HCC). During reverse transcription, 5% — 10% of viral genomes are converted into double-stranded linear DNA that is randomly inserted into host chromosomes, generating stable iDNA and continuously producing HBsAg, thereby driving B- and T-cell immune exhaustion and locking the host in an immune-tolerant state. The process of iDNA runs throughout the entire natural history of HBV infection, and the viral enhancers it carries can promote clonal hyperplasia of indeterminate potential, accumulate pre-neoplastic mutations, and ultimately lead to HCC. Although long-term nucleos(t)ide analog or interferon therapy can suppress viral replication and reduce the formation of new integrations, existing therapies still fail to eliminate existing iDNA. Therefore, there is an urgent need for innovative strategies that can precisely target integration breakpoints, epigenetically silence iDNA, or eradicate integrated clones, so as to significantly increase the functional cure rate of CHB and fundamentally reduce the risk of HCC.
Hepatitis B virus (HBV) infection is one of the major global health problems, and it can lead to the development of liver cirrhosis and hepatocellular carcinoma. Due to the strict species specificity of HBV infection, no animal model has yet been established to fully support the complete life cycle of HBV infection and accurately reflect host immune responses and pathogenesis. Current animal models used for HBV research include various hosts such as chimpanzees, tree shrews, and mice, as well as surrogate models based on related hepatotropic viruses. Although these models have contributed significantly to the research on HBV replication, immune response, and antiviral drug evaluation, they still have certain limitations such as ethical concerns, low infection efficiency, high costs, and a lack of persistent infection. In recent years, the development of novel strategies, such as humanized mouse models with reconstituted human liver and immune systems, transgenic models, and viral vector-mediated infection systems, has greatly promoted the research on HBV biology. In the future, with the integration of emerging technologies including gene editing, tissue engineering, and multi-system reconstruction, it is possible to establish HBV infection models that can more closely mimic human pathophysiology, thereby laying a robust foundation for understanding virus-host interactions, exploring the pathways for viral clearance, and developing radical treatment strategies.
Chronic hepatitis B is still one of the main chronic Iiver diseases in China. Although antiviral therapy has achieved good therapeutic effects, there are still many problems that have not been solved. To assist clinical physicians in accurately and reasonably diagnosing and treating chronic hepatitis B, this consensus elaborateson the understanding, diagnosis, and treatment of chronic hepatitis B from both perspectives of traditional Chinese and Western medicine, It comprehensively and deeply presents the Iatest research progress in this field, so as to provide a reference for clinical practice.
Hepatic vascular diseases (such as portal vein thrombosis, porto-sinusoidal vascular disease, hereditary hemorrhagic telangiectasia, arterioportal fistula, and sinusoidal obstruction syndrome, Budd-Chiari syndrome) are characterized by diverse clinical manifestations, difficulties in diagnosis, and various treatment regimens, which brings huge challenges to clinical diagnosis and treatment, and at present, there are still no guidelines or consensus statements on the diagnosis and treatment of hepatic vascular diseases in China. To standardize and improve the diagnosis and treatment of hepatic vascular diseases in China, Committee on Liver Diseases (Integrated Traditional Chinese and Western Medicine) of China Research Hospital Association, Committee on Interventional Medicine of China Research Hospital Association, and Branch for Multidisciplinary Diagnosis and Treatment of Portal Hypertension of Beijing Medical Doctor Association organized the experts in related fields to develop expert consensus on clinical practice for the diagnosis and treatment of hepatic vascular diseases (2025 edition) based on the latest evidence-based medical research and the clinical practice in China, with a focus on the diagnosis and treatment of hepatic vascular diseases.
Histopathological examination is currently the gold standard for the diagnosis of metabolic associated fatty liver disease (MAFLD); however, due to its invasiveness, high risks, and low feasibility, application of noninvasive indicators in the staging and classification of MAFLD has become a research hotspot. This article systematically reviews the efficacy of dynamic changes in various noninvasive markers in reflecting histological changes and clinical outcome events in MAFLD patients, in order to provide theoretical support for dynamic monitoring and individualized management of the disease.
Metabolic associated fatty liver disease (MAFLD) is a chronic liver disease closely associated with metabolic syndrome, characterized by a complex pathogenesis involving genetic, environmental, and lifestyle factors. Recent studies have shown significant disparities in the prevalence rate and clinical features of MAFLD across different racial and ethnic groups, and such disparities might be associated with various factors such as genetic background, environmental factors, socioeconomic disparities, and metabolic profiles. This article reviews the latest research advances in racial and ethnic differences in MAFLD in China and globally, discusses its potential pathogenic mechanisms and clinical significance, proposes future research directions and interventional measures, and emphasizes the critical need to enhance MAFLD screening and preventive health education in multiethnic populations.
Metabolic associated fatty liver disease (MAFLD) is the main type of chronic liver disease in the world, with an increasingly higher incidence rate and a younger age of onset. At present, the treatment of MAFLD mainly depends on lifestyle intervention and comorbidity management, and there is still a lack of effective drugs for MAFLD itself. As a classic nonsteroidal anti-inflammatory drug of the salicylic acid family, aspirin can intervene in the pathological process of MAFLD by regulating lipid metabolism, relieving insulin resistance, reducing liver inflammation and oxidative stress response, exerting an anti-liver fibrosis effect, and inhibiting hepatocellular carcinoma, and therefore, it has the value of preventing disease onset, delaying disease progression, and reversing disease condition. This article systematically reviews the mechanism of action and safety of aspirin in the treatment of MAFLD, in order to provide more drug treatment options for MAFLD patients.
Hepatic fibrosis is a complex dynamic process caused by multiple chronic pathogenic factors, characterized by excessive accumulation of liver extracellular matrix and abnormal liver structure and function. If anti-fibrotic treatment is not performed in time, it can progress to liver cirrhosis and even liver cancer. Hepatic fibrosis has a complex pathogenesis, and previous studies mainly focused on the activation of hepatic stellate cells. Recent studies have shown that myeloid cells have the potential of multi-directional differentiation and can also participate in the development and progression of hepatic fibrosis. This article systematically reviews the role and regulatory mechanism of myeloid cells in hepatic fibrosis, in order to provide a reference for clinical diagnosis and targeted therapy.
Hepatic fibrosis refers to excessive accumulation and abnormal proliferation of fibrous connective tissue in the liver triggered by multiple pathogenic factors, and it may progress to liver cirrhosis, portal hypertension, and liver cancer. The pathological mechanisms of hepatic fibrosis involve hepatocyte injury, inflammatory cell infiltration with the release of inflammatory mediators, hepatic stellate cell activation, and extracellular matrix deposition. Recent studies have focused on mitochondrial dysfunction in disease progression, including the molecular pathways for hepatic fibrosis driven by metabolic disorders, energy deficiency, oxidative stress, mitochondrial dynamic imbalance, and autophagic dysfunction, all of which can induce liver injury. This article reviews the latest advances in hepatic fibrosis, in order to provide new therapeutic strategies for clinical management.
Hepatic fibrosis is not only a pathological process of hepatic self-repair after chronic liver injury, but also a critical stage in the progression of chronic liver disease to liver cirrhosis. Studies have shown that as a pro-inflammatory form of programmed cell death, pyroptosis plays an important role in various diseases and is also considered a potential therapeutic target for hepatic fibrosis. This article systematically reviews the association of pyroptosis in hepatocytes, hepatic stellate cells, and hepatic macrophages with hepatic fibrosis and discusses pyroptosis-mediated therapeutic strategies targeting hepatic fibrosis.
Patients with liver cirrhosis are more susceptible to various bacterial or viral infections due to immune dysfunction. Recent studies have shown that compared with the general population, individuals with liver cirrhosis show a significant increase in the incidence rate of adverse outcomes after severe acute respiratory syndrome coronavirus 2 infection, including the progression of liver injury and the increase in mortality rate. Vaccination can reduce the incidence rates of breakthrough infections and severe coronavirus disease 2019 (COVID-19) in patients with liver cirrhosis, but such patients have low immune response and thus require booster doses to enhance immunity. This article reviews the clinical features of cirrhotic patients with COVID-19 and related management strategies, in order to provide evidence-based guidance for the clinical diagnosis and treatment of such patients.
Acute liver injury poses a serious threat to the life safety of patients, and currently there is still a lack of satisfactory treatment options. As a cytoprotective transcription factor, nuclear factor erythroid 2-related factor 2 (Nrf2) has important potential in the treatment of acute liver injury. Nrf2 exerts a protective effect by inducing the expression of antioxidant enzymes, regulating iron and fatty acid metabolism, protecting mitochondrial function, and inhibiting inflammatory responses, and it can also enhance the antioxidant capacity of the liver and inhibit the progression of acute liver injury by activating antioxidant response element and promoting the expression of the antioxidant enzymes such as heme oxygenase-1, glutathione transferase, and glutamate-cysteine ligase catalytic subunit. Nrf2 can modulate acute liver injury caused by different etiologies. Natural compounds such as curcumin and synthetic compounds such as oltipraz can activate Nrf2 through different mechanisms, enhance the antioxidant capacity of the liver, and thus exert a protective effect against acute liver injury. However, there are still various challenges in Nrf2 in the treatment of acute liver injury, and its mechanism of action remains unclear, with most studies in the stage of experimental study. In the future, it is expected to deeply investigate the mechanism of action of the Nrf2 signaling pathway, optimize drug development strategies, improve the clinical application theories for agonists, and provide more effective and precise treatment regimens for patients with acute liver injury.
The thyroid gland is the largest endocrine organ in the human body, and its dysfunction can cause varying degrees of liver injury, leading to liver failure in severe cases. Patients with hyperthyroidism have a relatively high incidence rate of liver dysfunction, manifesting as hepatocellular injury or cholestatic liver injury, while hypothyroidism is closely associated with metabolic dysfunction-associated fatty liver disease. Autoimmune thyroid diseases, including Hashimoto’s thyroiditis and subacute thyroiditis, are commonly comorbid with autoimmune liver disease. In addition, medications such as antithyroid drugs, amiodarone, and immune checkpoint inhibitors can cause severe liver injury through direct toxicity or immune-mediated mechanisms. Although significant progress has been achieved in related diagnosis and treatment techniques in recent years, there are still many challenges in pathogenesis, individualized treatment strategies, early warning, and prognostic evaluation. This article systematically reviews the research advances in liver injury associated with thyroid dysfunction and proposes the directions for future research, in order to provide guidance for clinical diagnosis and treatment.
Acute-on-chronic liver failure (ACLF) is a syndrome of multiple organ failure on the basis of underlying chronic liver disease and has an extremely high short-term mortality rate, while there is still a lack of unified diagnostic criteria around the world. Radiology plays an important role in the evaluation and prognostic prediction of ACLF, constituting a multi-dimensional assessment system covering morphology, function, and hemodynamics. Computed tomography can be used for the measurement of liver volume and the diagnosis of sarcopenia by providing key morphological and nutritional parameters. Magnetic resonance imaging (MRI), especially gadobenate dimeglumine-enhanced MRI, enables quantitative assessment of liver function and has critical significance for predicting short-term survival rate. Ultrasonography and elastography techniques facilitate the early warning of ACLF onset and the dynamic monitoring of its progression through noninvasive measurement of liver stiffness and hemodynamic parameters. This article systematically reviews the pivotal role of these three imaging modalities in the diagnosis and monitoring of ACLF, and integrating the strengths of multiple imaging techniques with clinical indicators to construct diagnostic and prognostic models may become a key future direction for achieving early intervention and improving clinical outcomes in ACLF.
Chronic liver diseases are a group of diseases in which the liver is subjected to a variety of injuries over a long period of time, resulting in irreversible pathological changes that last longer than 6 months. Emodin (EMO) is a natural anthraquinone derivative derived from Rheum officinale, and its pharmacological effect has been extensively studied, exhibiting a variety of biological properties and involving multiple signaling molecules and pathways. Western medicine or surgical treatment is currently the main treatment regimen for chronic liver diseases, and the advance in treatment is limited by various reasons such as side effects and high costs. Due to its natural origin and efficacy, EMO has unique advantages in the treatment of chronic liver diseases and has now become a research hotspot. This article summarizes the therapeutic effect of EMO on chronic liver diseases and its mechanism, in order to provide a certain scientific basis for the traditional Chinese medicine treatment of chronic liver diseases and the development of drugs in clinical practice.
Chronic liver disease is a general term for a variety of liver diseases, and its prevalence rate is increasing year by year. With the progression of the disease, patients may experience a variety of serious complications and even progress to liver failure. In recent years, a number of studies have revealed the association between ectopically colonized oral bacteria and chronic liver disease and explored their potential value in the diagnosis and treatment of chronic liver disease. This article systematically reviews the association of ectopically colonized oral bacteria with metabolic associated fatty liver disease, liver cirrhosis, and liver cancer and analyzes the mechanism for the influence of ectopically colonized oral bacteria on chronic liver disease, so as to provide a reference for the diagnosis and treatment of chronic liver disease using ectopically colonized oral bacteria.
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- 1Current situation in the research of Gilbert’s syndrome
- 2Review of acute pancreatitis scoring systems
- 3Clinical value of 13C-methacetin breath test for assessing liver function in patients with cirrhosis
- 4Studies on relevant gactors of Child-Pugh grading in hepatic cirrhosis
- 5Meta-analysis of 111 patients with nonalcoholic steatohepatitis-associated hepatocellular carcinoma
- 6Relationship between Epstein-Barr virus infection and hepatic lesions in children
- 7Research state and prospect of hyponatremia in cirrhosis
- 8Congenital bile acid synthesis defect and cholestatic liver disease
- 9Interventional treatment for Budd-Chiari syndrome:reports of 883 cases
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- 1The guideline of prevention and treatment for chronic hepatitis B: a 2015 update
- 2Chinese guidelines for the management of acute pancreatitis ( Shenyang , 2019 )
- 3The guideline of prevention and treatment for chronic hepatitis B(2010 version)
- 4Comprehensive guidelines for the diagnosis and treatment of pancreatic cancer (2018 version)
- 5Current situation in the research of Gilbert’s syndrome
- 6Consensus on the diagnosis and management of primary biliary cirrhosis (cholangitis)(2015)
- 7Diagnosis, management, and treatment of hepatocellular carcinoma (V2017)
- 8Consensus on the diagnosis and management of autoimmune hepatitis(2015)
- 9Guidelines for the prevention and treatment of chronic hepatitis B (version 2019)
- 10
International Database
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