Abstract
Glomerulonephritis is an important extrahepatic manifestation of chronic hepatitis B virus (HBV) infection. The uncommon occurrence, variability in renal histopathology, and heterogeneity in clinical course present challenges in clinical studies and have resulted in a relative paucity of data and uncertainty with regard to the optimal management of HBV-related glomerular diseases. The advent of nucleos(t)ide analogue medications that effectively suppress HBV replication has markedly altered the clinical outcomes of kidney transplant recipients with HBV infection, but the emergence of drug resistance is an escalating problem. This article reviews the recent knowledge of the pathogenesis and treatment of HBV-related membranous nephropathy, and discusses the management of hepatitis B in kidney transplant recipients, which is continuously evolving.
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Introduction
The hepatitis B virus (HBV) has a complex relationship to kidney diseases. Chronic HBV infection is an etiologic factor in secondary glomerular diseases. From an opposite perspective, the HBV carrier status has a critical impact on the clinical management of kidney transplant recipients and patients with renal diseases who are treated with immunosuppressive drugs.
HBV is not directly cytopathic to hepatocytes. The host immune response, especially via virus-specific cytotoxic T lymphocytes, is the basis for hepatocellular damage as well as viral clearance. Neonatal exposure to HBV when the immune system is immature results in minimal acute hepatitis, but this is followed by chronic infection in 90% of subjects, and contributes to the bulk of chronic HBV carriers. After entering hepatocytes by endocytosis, the partially double-stranded viral genomic DNA is transported into the nucleus, where it is converted to covalently closed circular DNA, which serves as a template for transcription of viral mRNAs, which in turn are used for viral replication through reverse transcription and the production of viral DNA polymerase and other viral proteins. Intrahepatic covalently closed circular DNA thus accounts for the persistence of infection. About 350 million people worldwide have chronic HBV infection. The importance of HBV in clinical nephrology increases markedly in areas with endemic infection such as South East Asia, where the proportion of chronic HBV carriers can exceed 10% in the general population. In this regard, data from a recent series that included 390 patients with membranous nephropathy showed that HBV was the underlying cause in 12% of patients [1]. This article reviews the clinical and therapeutic aspects of HBV-related glomerulonephritis focusing on membranous nephropathy, kidney transplantation with HBsAg-positive donors, and the evolving management of hepatitis B in kidney transplant recipients.
HBV-related Glomerulonephritis
Extrahepatic manifestations of HBV infection can present as glomerulonephritis, vasculitis, or reactive arthritis. Glomerular disease is more common in children than adults, and in men than women [2]. The more common renal histopathologies include membranous nephropathy and membranoproliferative glomerulonephritis. An association with IgA nephropathy has been reported, and recent reports also suggest a possible link with focal segmental glomerulosclerosis [3].
Pathogenic Mechanisms
Both viral and host factors are involved in pathogenesis. An association with HLA genes has been reported, indicating the impact of genetic predisposition [4]. The main pathogenic mechanism in HBV-related glomerular diseases is through the deposition of immune complexes in the glomerulus. The immune complexes are comprised of viral antigens and the antibodies that these antigens invoke from the host. Whether these immune complexes are formed in situ or are derived from circulating immune complexes being trapped in the glomerulus remains controversial. Various HBV antigens including hepatitis B surface antigen (HBsAg), hepatitis B early antigen (HBeAg), and hepatitis B core antigen (HBcAg) have been demonstrated in the glomeruli of patients with HBV-related glomerulonephritis, and the detection of covalently closed circular DNA in renal tissue has also been reported [5]. Immune deposition occurs predominantly in the subepithelial region but can also involve the mesangial and occasionally subendothelial areas, depending on the size of the antigens and immune complexes. It has been speculated that the low molecular weight of HBeAg (3 × 105 Da) might account for its ability to traverse the glomerular basement membrane and thus the formation of subepithelial immune deposits [6]. The observed association between remission of proteinuria and clearance of HBeAg also provides indirect evidence that the antigen is involved in pathogenesis. The immune complexes then activate complements and glomerular injury occurs via the formation of membrane attack complex and other downstream events such as the induction of proteases, oxidation injury, and disruption of cytoskeleton [7, 8]. Investigations on renal gene expression profile with microarrays, in transgenic mice that expressed HBsAg and HBcAg in the cytoplasm of renal tubular epithelial cells but without replication of the whole virus, have revealed upregulation of complement and coagulation pathways and acute phase response genes, and reduced circulating C3 levels [9].
It has been reported that the sera of patients with chronic HBV infection could induce apoptosis in cultured HK-2 cells, a cell line for the study of human proximal renal tubular epithelial cells, via up-regulation of Fas gene expression [10]. Furthermore, the induction of apoptosis correlated with the level of circulating HBV DNA, and HBV carriers also showed a higher circulating level of transforming growth factor-beta, a growth factor implicated in the potentiation of apoptosis and renal fibrosis. These preliminary data suggest the presence of serum factor(s) in HBV carriers which could alter renal tubular cell function, and should be confirmed using samples from patients with documented nephritis and in podocytes.
HBV can be classified into eight major genotypes based on genome sequence divergence. The impact of viral genetics was recently investigated in a study that included two pediatric and four adult Japanese patients, five of whom had membranous nephropathy, and one with membranoproliferative glomerulonephritis [11]. All the patients were HBeAg-positive and had high circulating HBV DNA levels. The investigators did not find any association between nephropathy and mutations in the HBV genome. However, the genotyping results were interesting. Previous studies showed that genotype C was predominant among local subjects with chronic hepatitis B, whereas genotype A accounted for only 1.7% [12]. Yet complete viral genome sequencing showed that among the patients with nephropathy four had HBV genotype A1/A2, whereas two were infected with genotype C2. A high prevalence of genotype A in patients with HBV-related nephropathy had been reported by other investigators [13, 14]. Whether HBV genotype A may indeed be more likely to lead to renal manifestations compared with other genotypes, and the mechanisms accounting for such difference, require further investigations.
Clinicopathologic Features of HBV-related Membranous Nephropathy and Membranoproliferative Glomerulonephritis
Patients with HBV-related membranous nephropathy typically present with proteinuria, which could be in the nephrotic range, and microscopic hematuria. Impaired renal function is more common in patients with membranoproliferative glomerulonephritis. The natural history of HBV-related membranous nephropathy appears different between children and adults. In contrast to pediatric subjects, in whom spontaneous remission of proteinuria is common and the renal function is often well preserved, adult patients are more likely to have progressive disease and up to one third of patients might eventually develop renal failure [13, 15, 16]. A temporal relationship between increased hepatitic activity and deterioration of proteinuria has been observed in some patients [17], and could be associated with cryoglobulinemia.
HBV-related membranous nephropathy is characterized by thickened capillary wall and glomerular basement membrane on light microscopy. Although this feature could be subtle in the early stage, the capillary wall can assume a rigid appearance in advanced disease. Immunofluorescent staining and electron microscopy demonstrate granular IgG, C3, and some IgM staining in the subepithelial region along the glomerular basement membrane accompanied by extensive effacement of the podocyte foot processes, and in some cases viral particles in various locations within the glomerulus. Mesangial abnormalities are more common in secondary membranous nephropathy compared with the idiopathic form. Mesangial expansion and capillary wall thickening resulting in a lobular appearance of the glomerular tuft characterize the light microscopic findings in membranoproliferative glomerulonephritis. The capillary wall also demonstrates a double-contour appearance and hypercellularity with interpositioning of cells. The latter may include infiltrating monocytes and neutrophils. Immune deposits containing IgG, complement components, and IgM appear granular on immunofluorescent staining, and are located in the subendothelial, mesangial, and paramesangial areas. In addition to these electron-dense deposits, which could also be present in the subepithelial region, albeit in smaller amounts, electron microscopy also shows subendothelial expansion and the formation of new basement membrane material, which accounts for the double-contour appearance on light microscopy. The subendothelial and mesangial immune deposits trigger complement activation and increased local expression of inflammatory and chemotactic mediators, leading to the infiltration of inflammatory cells.
Treatment of HBV-related Membranous Nephropathy
Much of the data on the treatment of HBV-related glomerular diseases came from patients with membranous nephropathy, the most common histologic presentation, whereas the data on membranoproliferative glomerulonephritis or focal segmental glomerulosclerosis remain largely anecdotal. Treatment with interferon [14, 18–25] or lamivudine [17, 26–28] has been reported to lead to a reduction of proteinuria in patients, mostly children, with HBV-related membranous nephropathy.
Conventional and pegylated interferon-α possess both immunoregulatory and antiviral effects [29]. Interferon-α activates cellular pathways that lead to breakdown of viral RNA and enhances cell-mediated immune response toward hepatocytes infected with HBV. Interferon treatment given for 4–12 months was associated with sustained remission of proteinuria in 20% to 100% of patients, clearance of HBeAg in 20% to 80%, and a drop-out rate of 10% to 15%. Resolution of proteinuria was often associated with clearance of HBeAg and/or HBsAg, and usually occurred within 6 months of seroconversion [13, 23, 24]. However, most of the reported data were anecdotal reports or data from small series. Bias from selective publication of positive results remains possible. There is also a general impression that the results in adults may be less favorable compared with children.
Nucleos(t)ide analogues such as lamivudine, telbivudine, adefovir, entecavir, or tenofovir suppress HBV replication through their inhibitory effect on viral DNA polymerase. Because the deposition of immune complexes within the glomerulus is perceived to play a pivotal role in the pathogenesis of HBV-related nephropathy, reducing the quantity of viral antigens and thereby reducing immune complex deposition in the kidneys should (in theory) ameliorate kidney damage. Compared with interferon, nucleos(t)ide analogues offer the advantages of convenient administration and high tolerability, but often require long-term administration and could result in the selection of drug-resistant HBV strains. Adefovir should be used with caution in patients with renal impairment in view of its nephrotoxicity, which is mediated through inhibitioin of mitochondrial DNA replication resulting in disruption of normal mitochondrial respiratory function in proximal renal tubular epithelial cells. There are also uncommon reports of renal tubular toxicity with tenofovir [30]. Even fewer data exist regarding nucleos(t)ide analogues than interferon on HBV-related nephropathy. The factors predictive of treatment efficacy and the selection criteria for treatment also remain undefined. Data from a recent report on 10 patients with HBV-related membranous nephropathy showed that lamivudine treatment was associated with complete resolution of proteinuria in six patients [28]. However, the concomitant use of angiotensin-converting enzyme inhibitors, angiotensin II receptor blockers, and antihypertensive medications precluded definitive conclusions on the renal effect of antiviral treatment. Future studies on the effect of antiviral therapy on proteinuria or renal survival should thus include concurrent controls with comparable exposure to these potential confounders.
The renal prognosis is distinctly different between pediatric and adult patients, with the incidence of chronic kidney disease reported as less than 3% in children and up to 30% in adult patients [13, 15]. The overall data suggest that a favorable renal response to antiviral treatment seems more likely in pediatric patients than adults, and in patients when renal manifestations are accompanied by increased viral replication, a high HBV DNA level, and hepatitic flare.
HBV and Kidney Transplantation
The prevalence of HBsAg seropositivity in the general population varies from less than 1% in nonendemic areas to more than 10% in regions with endemic infection. Similarly, the prevalence of HBV carriers among patients on dialysis varies from about 1% in the United States to more than 10% in some Asian countries [31, 32]. The use of kidneys from HBsAg-positive donors demands caution to avoid transmission of infection via the allograft. HBsAg-positive kidney transplant recipients are at risk of enhanced viral replication and exacerbation of the liver disease consequent to immunosuppression.
HBsAg-positive Kidney Donors
The use of kidneys from HBsAg-positive donors has been a controversial issue. In regions with endemic HBV infection, HBsAg-positive subjects account for a significant donor pool. With the availability of effective antiviral nucleos(t)ide analogues, little disagreement exists on kidney transplantation from an HBsAg-positive donor to an HBsAg-positive recipient. However, there has been concern over the safety of transplanting from an HBsAg-positive donor to a recipient who is anti–HBs-positive, for fear that the preexisting immunity might not be adequate to combat the virus load transferred with the transplanted kidney in the face of heavy immunosuppression. Data from relatively small series, from our unit and others, suggested that it was safe to transplant kidneys from HBsAg-positive donors to anti–HBs-positive recipients [33]. A recent report examined the outcomes of 65 anti–HBs-positive subjects who had received kidney transplants from HBsAg-positive deceased donors, and compared them with 308 anti–HBs-positive subjects who had received kidney transplants from HBsAg-negative deceased donors, with an average follow-up of more than 3 years [34•]. All kidney transplant recipients were given 400 units of anti-HBV immunoglobulin at the time of surgery, and those who had received HBsAg-positive kidneys had a second dose 1 month later. When the donor was HBV DNA-positive by quantitative polymerase chain reaction assay, the recipients were given a prolonged course of anti-HBV immunoglobulin at 400 units weekly for 3 months and lamivudine for 6 months. Seroconversion to HBsAg-positivity occurred in two patients, one in the donor HBsAg-positive group (the donor was HBV DNA-negative) at 3 months and the other in the donor HBsAg-negative group (the donor was also anti–HBc-negative) within the first month. Baseline anti-HBs levels in the two kidney recipients were 63.6 IU/L and 4.6 IU/L, respectively. The second patient seroconverted back to become HBsAg-negative and anti–HBs-positive at 6 months after transplantation. Different investigators have reported occult HBV infection in patients on long-term dialysis, which can occur even in the presence of anti-HBs [35, 36]. In this study, potential kidney recipients were apparently monitored serially for their HBV DNA status, although the sensitivity of detection was not stated. The absence of viral gene sequence data precluded definitive conclusions on whether the HBsAg seroconversions were caused by de novo HBV infection. Nevertheless, the data reaffirm the overall safety of transplanting kidneys from HBsAg-positive donors to anti–HBs-positive recipients, irrespective of whether the immunity has resulted from prior natural infection or vaccination. However, the role of perioperative anti-HBV immunoglobulin and antiviral medications remains unclear.
HBV Infection in Kidney Transplant Recipients
HBV-related liver complications can present as de novo infection, acute flare in patients with chronic infection, fibrosing cholestatic hepatitis, chronic hepatitis, cirrhosis, or hepatocellular carcinoma. The adverse impact of HBV infection on clinical outcomes has been reported by different investigators [37–40]. Surveillance for hepatocellular carcinoma with regular α-fetoprotein measurement and liver ultrasonogram is essential in view of the much improved prognosis conferred by the diagnosis of early tumor compared with advanced disease. Prevention and surveillance of liver complications in HBsAg-positive kidney transplant recipients is a lifelong process that starts before kidney transplantation (Table 1).
Data from patients with hepatitis C infection showed that interferon treatment could lead to a high incidence of renal allograft failure [41]. Thus, prior to the advent of nucleos(t)ide analogues, the lack of effective and safe treatment had added to the clinical challenge in the management of hepatitis B in kidney transplant recipients. The incidence of chronic liver disease in HBsAg-positive kidney transplant recipients was up to 80%, and about 60% of the mortalities were from liver complications [37–40]. Our own data showed that in the prelamivudine era, HBsAg-positive kidney transplant recipients had excessive early mortality rates within the first 2 years after transplantation compared with HBsAg-negative controls, and the deaths were from severe hepatitic flares brought about by heavy immunosuppression [40]. Although 43% of the HBsAg-positive patients were HBeAg-positive at the time of kidney transplantation, HBeAg status by itself could not serve as a reliable predictor of liver complications, and severe complications could also occur in HBeAg-negative subjects.
Monitoring and Treatment
The management of HBsAg-positive kidney transplant recipients entails monitoring for the early diagnosis of liver complications, especially with regard to hepatitic flare and hepatocellular carcinoma, and the prevention of cirrhosis. Hepatitic flares are preceded by accelerated viral replication and increasing circulating HBV DNA levels, and the risk of flare varies according to the level of concurrent immunosuppression. Fibrosing cholestatic hepatitis, an uncommon but serious complication occurring in heavily immunosuppressed patients, is characterized by relatively mild elevations in serum transaminase levels but markedly elevated HBV DNA levels and a rapid progression to liver failure if untreated. Serial quantitation of HBV DNA titer is thus important for the early diagnosis of impending serious acute liver complications. It has been shown that, compared with prophylactic or preemptive treatment, salvage treatment given after the onset of hepatic dysfunction was associated with inferior clinical outcomes [42].
We have reported that serial monitoring of circulating HBV DNA levels combined with nucleos(t)ide analogue treatment in patients who showed an increasing viral load was highly efficacious in reducing liver complications and markedly improved the survival of HBsAg-positive kidney transplant recipients [40]. If frequent monitoring of HBV DNA level is not available, it is also acceptable to start treatment prophylactically at the time of kidney transplantation in view of the frequent occurrence of hepatitic flare within the first 2 years after kidney transplantation in HBsAg-positive subjects. Our latest results show that nucleos(t)ide analogue treatment is associated with improved long-term patient survival in HBsAg-positive kidney transplant recipients, from 40% to 70% at 20 years, and that the patient survival rates are similar between HBsAg-positive and HBsAg-negative subjects transplanted in the present era of nucleos(t)ide analogue treatments up to 10 years after transplantation (unpublished data). The beneficial effect of antiviral treatment on patient survival was confirmed in a series of 27 Korean patients who had been treated with lamivudine when their HBV DNA levels increased after kidney transplantation [43]. The 10-year patient survival rates increased from 50% in those without treatment to 85% in lamivudine-treated subjects.
In our previous studies, we started nucleos(t)ide analogue treatment when HBV DNA level was at or above 105 copies/mL irrespective of normal transaminase levels, or in the range of 102–105 copies/mL when the transaminase level was elevated. The HBV DNA threshold for treatment in nonimmunosuppressed subjects is constantly evolving. In patients presenting with severe hepatitic flare, treatment is recommended as long as HBV DNA is detectable. By contrast, the HBV DNA threshold for treatment has been set at 2,000 IU/mL or about 104 copies/mL in subjects with compensated cirrhosis and normal transaminase levels [44•]. In patients with precirrhotic liver disease, correlations have been observed between the level of HBV DNA and the risk of cirrhosis, hepatocellular carcinoma, and liver-related mortaliy, and the risk ratio starts to increase when the HBV DNA level exceeds 104 copies/mL. Poor outcomes are predicted by persistently high HBV DNA levels and the persistence of HBeAg [45, 46]. Treatment decisions are thus informed by transaminase levels, HBV DNA levels, HBeAg status, and liver histology, with HBV DNA levels of 104–105 copies/mL regarded by most as the threshold.
Lamivudine Resistance
Prolonged treatment with nucleos(t)ide analogues can lead to the selection of drug-resistant HBV variants. Avoidance of this problem might be accomplished with discontinuation of treatment after stabilization, but this is feasible in not more than half of the patients [40, 47]. Most patients thus require continued treatment for an indefinite duration. We observed a cumulative drug resistance rate of 48% in kidney transplant recipients who had received lamivudine treatment for an average duration of 69 months [48]. Drug resistance could not be predicted by patient demographics, baseline HBeAg status or HBeAg seroconversion, or HBV genotype, but was associated with a high pretreatment HBV DNA titer, similar to what had been observed in non-immunosuppressed individuals. Following the emergence of drug resistance, both the HBV DNA and the transaminase levels showed a biphasic longitudinal profile, so that an initial increase was followed by spontaneous gradual improvement, with peak transaminase levels appearing later than those of HBV DNA. About 80% of patients developed hepatitic flares. It is noteworthy that the peak transaminase level after the emergence of lamivudine resistance was more than twice the level at baseline, and some patients might develop potentially fatal complications during flare. Thus treatment with alternative medications are indicated. Similar to our experience, Korean investigators have reported a 53% cumulative resistance rate in kidney transplant recipients after 5 years of lamivudine treatment, and in this series two patients died from hepatitic flares after the emergence of drug resistance [43].
We recently reported our preliminary experience in the management of kidney transplant recipients who developed lamivudine resistance [49]. The data showed that, whereas alternative agents such as entecavir or adefovir were mostly effective, the suppression of viral load was less rapid compared with the rate of HBV DNA decline in treatment-naïve subjects. We used adefovir only in patients with serum creatinine below 150 umol/L, and their kidney function remained stable during short-term follow-up.
Similar to kidney transplant recipients, HBsAg-positive patients with other kidney diseases that require immunosuppressive treatment are exposed to the risk of viral activation and hepatitic flare. We have adopted a similar protocol of HBV DNA monitoring and preemptive treatment in patients with severe lupus nephritis who require combination treatment with high-dose corticosteroid and a cytotoxic agent, and have shown that this can effectively prevent or abort hepatitic flares [50].
Conclusions
Although the incidence of new infection is decreasing with the increasing practice of hepatitis B vaccination, HBV infection is still a profound global problem and an important cause of secondary glomerular diseases. The data suggest that patients presenting with proteinuria accompanied by active viral replication, a high viral load, and active hepatitis are more likely to show renal benefit following antiviral treatment. More data from adults, and on nucleos(t)ide analogues, are awaited. By contrast, data are accumulating to confirm the efficacy of nucleos(t)ide analogue treatment in improving the survival of HBsAg-positive kidney transplant recipients, given either preemptively when HBV DNA level is increasing or prophylactically from the time of transplantation. Quantitation of circulating HBV DNA level facilitates the early diagnosis of hepatitic flare and the emergence of resistance. The management of drug resistance, and the threshold HBV DNA level for treatment, continue to evolve with increasing clinical experience.
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Chan, T.M. Hepatitis B and Renal Disease. Curr Hepatitis Rep 9, 99–105 (2010). https://doi.org/10.1007/s11901-010-0042-6
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DOI: https://doi.org/10.1007/s11901-010-0042-6