Acute hepatitis in three patients with systemic juvenile idiopathic arthritis taking interleukin-1 receptor antagonist
© Canna et al; licensee BioMed Central Ltd. 2009
Received: 7 September 2009
Accepted: 22 December 2009
Published: 22 December 2009
We investigated the etiology of acute hepatitis in three children with systemic Juvenile Idiopathic Arthritis (sJIA) taking Interleukin-1 receptor antagonist (IL1RA).
Laboratory and clinical data for three children with sJIA diagnosed at ages 13 months to 8 years who developed acute hepatitis during treatment with IL1RA were reviewed for evidence of sJIA flare, infection, macrophage activation syndrome (MAS), malignancy, and drug reaction.
In all patients, hepatitis persisted despite cessation of known hepatotoxic drugs and in absence of known infectious triggers, until discontinuation of IL1RA. Liver biopsies had mixed inflammatory infiltrates with associated hepatocellular injury suggestive of an exogenous trigger. At the time of hepatitis, laboratory data and liver biopsies were not characteristic of MAS. In two patients, transaminitis resolved within one week of discontinuing IL1RA, the third improved dramatically in one month.
Although sJIA symptoms improved significantly on IL1RA, it appeared that IL1RA contributed to the development of acute hepatitis. Hepatitis possibly occurred as a result of an altered immune response to a typical childhood infection while on IL1RA. Alternatively, hepatitis could have represented an atypical presentation of MAS in patients with sJIA taking IL1RA. Further investigation is warranted to determine how anti-IL1 therapies alter immune responsiveness to exogenous triggers in patients with immune dysfunction such as sJIA. Our patients suggest that close monitoring for hepatic and other toxicities is indicated when treating with IL1RA.
sJIA is a systemic autoinflammatory disorder of unknown etiology frequently characterized by quotidian fever, rash, generalized lymphadenopathy, hepatosplenomegaly, pericarditis and arthritis. Transaminitis, defined as elevation of hepatic enzymes (specifically alanine aminotransferase (ALT) and aspartate aminotransferase (AST)) in the absence of other clinical or laboratory evidence of hepatic injury, can be seen in patients with sJIA either in disease flares or due to hepatotoxic therapies like methotrexate [1, 2]. The mechanism by which patients develop sJIA is unknown, but it is felt to involve the interaction of infectious or inflammatory triggers with a genetic predisposition toward an enhanced proinflammatory response. Cytokines, particularly Interleukin-1 (IL-1) and Interleukin-6 (IL-6) have been implicated as important in disease pathogenesis and maintenance of inflammation [1, 2]. MAS is a complication of various rheumatologic and infectious diseases, and is often associated with sJIA. It is clinically characterized by cytopenias, disseminated intravascular coagulation, hemodynamic instability and liver and neurological involvement [3, 4]. Hemophagocytosis by activated macrophages is considered by most authors to be the most specific histopathological feature of MAS [3, 4]. Hemophagocytosis is generally accompanied by a lymphohistiocytic infiltrate including a predominance of CD8+ lymphocytes  although some reports in adults have additionally identified biliary injury and vascular microthrombi as frequent findings . Mortality due to MAS has been estimated at 8-22% [3, 7].
Non-steroidal anti-inflammatory drugs (NSAIDs) and systemic corticosteroids have historically been the mainstays of treatment for sJIA [1, 2]. There is evidence that methotrexate, cyclosporine, and etanercept are less effective in sJIA than in other forms of juvenile arthritis, and some disease-modifying drugs may be associated with development of MAS [1, 2]. IL-1 receptor antagonist (IL1RA) (anakinra) and anti-IL-6 (MRA/tocilizumab) have shown clinical efficacy in small open-label studies in sJIA and adult Still's Disease [8–11]. MAS, which leads to the greatest morbidity and mortality in patients with sJIA, is generally treated with supportive care, high dose intravenous corticosteroids and other immunosuppressive agents. MAS may also be treated with etoposide or cyclosporine in a similar fashion to primary or familial hemophagocytic lymphohistiocytosis (HLH), a genetic disorder related to alterations in cytotoxic granular release that can be triggered by infections and neoplasms . MAS is a form of secondary HLH. There is a single case report of successful treatment of MAS with IL1RA in a patient with sJIA .
As many as 50-100% of patients with sJIA respond to IL1RA [8, 10, 11]. Despite these promising case series, the safety of IL1RA in large numbers of patients with sJIA has not been established. Furthermore, the effects of IL-1 blockade on the inflammatory response of patients with sJIA have not been formally studied. One case report suggests IL1RA as a trigger for MAS in an adolescent with sJIA . In this case series we sought to investigate the extent to which a significant adverse event, acute hepatitis, was related to treatment with IL1RA in three patients with sJIA.
Patients and Methods
Three patients with sJIA, all treated at different tertiary care pediatric centers, developed acute hepatitis while taking IL1RA. All laboratory and clinical data were collected and reviewed retrospectively (Table 1). All three patients had a presentation of severe disease with significant arthritis and persistently elevated inflammatory markers, but differed in age and ethnicity. All liver biopsies were reviewed by a single hepatopathologist (SRN). The Colorado Multiple Institutional Review Board approved this series.
This case series is illustrative of three children with sJIA who developed acute hepatitis while being treated with IL1RA. Clinical and laboratory data, as well as liver biopsy, were not characteristic of MAS. Biopsies instead suggested hepatocellular injury from an exogenous cause, be it infectious or chemical (Figure 1). The presence of eosinophils in two of the three liver biopsies may also support an exogenous trigger contributing to the hepatitis. A viral trigger may have contributed to development of hepatitis in two patients, although serologies for viruses known to induce hepatitis were negative (Table 1). We are then left with a serious adverse event coincident with IL1RA treatment and reversed upon discontinuation of the drug. This suggests that IL-1 blockade contributed to the development or propagation of these patients' liver injury.
The clinical history of these patients underscores our lack of understanding of the influence of IL-1 blockade on the natural history of sJIA. Hepatitis could occur due to four potentially overlapping mechanisms. First, pure drug toxicity from anakinra appears possible, but unlikely given the absence of prior reports of hepatitis with anakinra therapy, the variable time to onset of hepatitis, and the tolerance of restarting IL1RA in two patients. Second, induction of autoimmune hepatitis (AIH) by the use of a biologic agent is possible, but also appears unlikely in the absence of specific autoantibodies or histopathological features associated with AIH. Third, immune dysregulation induced by IL1RA in children with sJIA could lead to hepatitis upon exposure to a normally benign infectious or environmental trigger. Fourth, IL1RA could change the clinical manifestations of MAS flare in some patients with sJIA leading only to acute hepatitis instead of the full MAS phenotype.
In vitro evidence suggests that inflammatory cytokines have pleiotropic effects on hepatocytes that can influence the development of hepatitis. Tumor necrosis factor receptor 1 (TNFR1), which can be expressed on hepatocytes, can signal through the TNFR-associated death domain (TRADD) to induce caspase activation and apoptotic cell death of hepatocytes . Signaling through TNFR1 can also lead to the formation of reactive oxygen species, sustained c-Jun N-terminal kinase (JNK) activation and apoptotic cell death via a caspase-independent mechanism . In contrast, signaling through TNFα and IL-6 receptors on hepatocytes can elicit signals that promote liver regeneration [17, 18]. These apparently contradictory findings underscore our poor understanding of the roles of cytokines in liver injury. IL1RA may change cytokine production and response in patients with sJIA, and in a subset of patients this could lead to direct effects on hepatocyte apoptosis and the development of hepatitis.
This case series is important in that it is the first account of acute hepatitis in children with sJIA treated with IL1RA. Hepatitis appears to have occurred outside the context of a sJIA flare or the development of MAS. The short half-life of IL1RA may have been advantageous, since discontinuation led to the rapid improvement of hepatitis. Newer IL-1 blocking agents with longer half-lives could have a more prolonged effect in susceptible patients with sJIA. Data in patients with sJIA and Still's Disease are emerging that support the efficacy and safety of IL-1 blockade, and use of these treatments will likely expand [2, 8, 10, 11]. Attention should be paid to possible hepatic side effects in clinical trials and post-marketing safety studies. Frequent LFT monitoring as well as the capacity for rapid reversal of IL-1 blockade may be important in preventing liver damage in some patients. This case series highlights the importance of more prospective studies such as the one recently published by Gattorno et al to determine the influence of IL-1 blockade on the cytokine networks in patients with sJIA .
Written informed consent was obtained from the parents of these patients for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
The authors thank Laura A. Shaw for her help with figure design.
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