Mercedes Robles-Díaz
Lana Nezic
Vesna Vujic-Aleksic
Einar S. Björnsson- 1Unidad de Gestión Clínica de Aparato Digestivo, Instituto de Investigación Biomédica de Málaga-IBIMA, Hospital Universitario Virgen de la Victoria, Facultad de Medicina, Universidad de Málaga, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Málaga, Spain
- 2Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina
- 3The Republic of Srpska Agency for Certification, Accreditation and Quality Improvement in Health Care, Banja Luka, Bosnia and Herzegovina
- 4Department of Internal Medicine, Landspitali University Hospital, Reykjavik, Iceland
- 5Faculty of Medicine, University of Iceland, Reykjavik, Iceland
Introduction: Treatment is generally not available for drug-induced liver injury (DILI) patients except in some specific circumstances. The management of DILI is based on the withdrawal of the responsible drug and monitoring the patients and only a few patients need to be referred to a transplant center. Some studies on the role of ursodeoxycholic acid (UDCA) in DILI have been published. The aim of this study was to perform a systematic review of the role of UDCA in the treatment and prevention of DILI.
Methods: A search was undertaken in PubMed, with the key words ursodeoxycholic acid, drug-induced liver injury and hepatotoxicity following the PRISMA guidelines.
Results: A total of 33 publications were identified: 25 case reports and 8 case series. In 18 of the 25 cases reports (22 patients), authors reported improvement of liver injury associated with UDCA therapy whereas 7 case reports did not show clinical or biochemical improvement after UDCA treatment. There were 4 studies evaluating the role of UDCA in the treatment of DILI, three prospective (one being a clinical trial) and one retrospective studies. Three studies observed liver profile improvements associated with UDCA. In addition, four studies evaluated UDCA in the prevention of DILI: one pilot study, two randomized clinical trials (RCT) and one retrospective study. Three of these studies observed a lower percentage of patients with an increase in transaminases in the groups that used UDCA for DILI prevention.
Conclusion: According to available data UDCA seems to have some benefits in the treatment and prevention of DILI. However, the design of the published studies does not allow a firm conclusion to be drawn on the efficacy of UDCA in DILI. A well designed RCT to evaluate the role of UDCA in DILI is needed.
Introduction
The management of drug-induced liver injury (DILI) and liver injury due to herbal and dietary supplements (HDS) has not changed much in the last decades (Stine and Lewis, 2016). One of the utmost steps in the DILI treatment is discontinuation of the implicated drug. Apart from that, there are only a few specific drugs that have demonstrated some efficacy in the treatment of DILI. Examples of this are N-acetylcysteine in paracetamol (acetaminophen) overdose, cholestyramine in DILI caused by leflunomide and terbinafine as well as l-carnitine in valproate hepatotoxicity. Furthermore, corticosteroids are frequently used in drug-induced hypersensitivity reactions and drug-induced autoimmune hepatitis (Chalasani et al., 2014; Stine and Lewis, 2016; Andrade et al., 2019; Chalasani et al., 2021) Although acute DILI is a relatively rare condition, clinical course can be dramatic leading to a fatal outcome. Indeed, it constitutes about the 50% of all cases of acute liver failure in USA (Reuben et al., 2016).
Ursodeoxycholic acid (UDCA) is recommended by liver societies for the treatment of patients with primary biliary cholangitis (PBC) (Hirschfield et al., 2017; Hirschfield et al., 2018; Lindor et al., 2019). In a systematic review of sixteen randomized clinical trials (RCTs) including 1447 PBC patients, UDCA showed a beneficial effect on liver biochemistry levels and histological progression in comparison with placebo (Rudic et al., 2012). In PBC, the recommended dose is 13–15 mg/kg per day, orally (Hirschfield et al., 2017). Higher doses have not shown higher benefits and are associated to higher rate of side effects. At recommended doses, it is very well tolerated and side effects have very low frequency. Among described side effects are diarrhoea, slight weight gain in the first months of treatment and hair thinning (Hirschfield et al., 2017).
Although UDCA has been suggested to be of benefit in the treatment of DILI, UDCA is not recommended as a treatment of DILI according to International guidelines (Chalasani et al., 2014; Andrade et al., 2019; Chalasani et al., 2021). Literature on the effects of UDCA in DILI consists mostly of case reports and small case series and no randomized controlled trial in patients with idiosyncratic DILI have been performed. Although use of UDCA in patients with DILI has been reported for more than 2 decades, no formal systematic review has been undertaken to date.
The aim of the current study was to systematically review available publications exploring the role of UDCA in the treatment and prevention of DILI in clinical settings.
Materials and Methods
A systematic review of the literature was performed with a MEDLINE search (via PubMed; 1946 to May 2021). This systematic review was performed following the PRISMA guidelines. The search strategy included the following main key words: “drug-induced liver injury” or “hepatotoxicity” combined with “ursodeoxycholic acid.” The review comprised any type of clinical study design with UDCA administration in DILI, therapeutic outcomes (positive or negative) and safety of UDCA. Additionally, any other relevant and specific issue related to UDCA administration in DILI were considered.
Inclusion criteria for relevant articles exploring UDCA in DILI treatment or prevention were: original studies and case reports of UDCA administration in adult or children diagnosed with liver injury induced by drugs, herbal or dietary supplements; in addition, UDCA administration for preventing DILI in patients before the onset of treatment with well-known hepatotoxic drugs. Exclusion criteria were reviews and meta-analysis, animal models, pre-clinical experimental studies with UDCA in DILI and acute liver injury due to other etiologies. References cited by the included studies and reviews were reviewed to retrieve additional references.
Each article extracted by the database search was independently screened for eligibility by different authors (R-DM, NL, V-AV) based on the criteria described above. Discrepancies were resolved by majority opinion. The work was supervised by a senior investigator (BE).
The following data were extracted from the included publications: surname of the first author, year of publication, number of patients, drug or herb responsible for DILI, DILI severity, UDCA treatment regimen, outcomes and DILI criteria when provided.
Results
A total of 154 publications were retrieved from the database search. Of them, 52 studies were excluded based on duplications and language (case reports in other languages different from English were excluded). After screening the title and abstract, 81 records did not meet the inclusion criteria, were irrelevant records to the current study or non-original articles and were excluded. After reviewing the references of the included studies and reviews identified in the literature search, 12 additional publications were retrieved.
Finally, a total of 32 publications in English and one in French in which the role of UDCA for treatment or prevention of DILI was reported, were included in the current study. Eight clinical studies with observational, prospective and retrospective design as well as RCT were identified. Twenty-five case reports in English with thirty DILI patients treated with UDCA were also selected (Figure 1).
FIGURE 1. Flow chart of the search of publications about the role of UDCA in DILI treatment and prevention.
Case Reports Dealing With Ursodeoxycholic Acid in the Drug-Induced Liver Injury Treatment or Prevention
The first case report on the role of UDCA in DILI was published in 1995 in two patients with flucloxacillin induced liver injury (Piotrowicz et al., 1995). Overall, five cases due to amoxicillin-clavulanate induced liver injury receiving UDCA (Chawla et al., 2000; Katsinelos et al., 2000; Studniarz et al., 2012; Ahmed et al., 2020) have been reported (Table 1). Furthermore, three associated to androgenic anabolic steroid (AAS) (Sánchez-Osorio et al., 2008; Krishnan et al., 2009; Stępień et al., 2015), three cases due to the combination of AAS and dietary supplements (Singh et al., 1996; El Khoury et al., 2017; Abeles et al., 2020), three due to Centella asiatica (Jorge and Jorge, 2005), two associated with immune check point inhibitors (Kurokawa et al., 2019; Onishi et al., 2020), one reaction each due to terbinafine (Agca et al., 2004), flutamide (Cicognani et al., 1996), ibandronate (Goossens et al., 2013), brentuximab vedotin (Neeman et al., 2019), methimazole (Gallelli et al., 2009), and Kratom that were treated with UDCA (Fernandes et al., 2019).
TABLE 1. Description of case reports in which ursodeoxycholic acid (UDCA) was used for DILI treatment or prevention.
Clinical improvement after UDCA treatment was observed in almost all amoxicillin-clavulanate cases (4 out of 5) but only 2 out of 6 cases due to AAS with or without dietary supplements. Among the other nine DILI reports, therapeutic response to UDCA was found to be positive in all except for one associated with brentuximab vedotin (Neeman et al., 2019) (Table 1).
In addition, there was one case of vanishing bile duct syndrome due to amoxicillin-clavulanate (Smith et al., 2005) and another one due to a combination of haloperidol, prochlorperazine, amitriptyline and phenytoin (O’Brien et al., 1996). In both of these reports important improvement was observed after starting treatment with UDCA. Another case of vanishing bile duct syndrome after the use of amoxicillin and naproxen in a child has been reported. In this case a slow improvement was seen only after increasing UDCA (40 mg/kg per day, orally) and adding, S-adenosyl-l-methionine, alprostadil, Pien TzeHuang (traditional Chinese medicine), and change in the fat diet to the treatment (Li et al., 2019). An additional case of sertraline-induced vanishing bile duct syndrome did not show improvement of liver tests after treatment with steroids and UDCA (Tejedor-Tejada et al., 2019) (Table 1).
Finally, there were two case reports of bosentan inducing DILI (Ito et al., 2014). When the episodes of DILI were resolved, bosentan, in lower doses, was restarted in the two cases together with UDCA. Bosentan treatment could then be continued without new DILI episodes. If it was adaptation or the preventive effect of UDCA is impossible to make any conclusions on. The total number of retrieved cases reports are presented in the Table 1, showing the author, patients’ age and gender, implicated drug, total bilirubin (TBL) peak level, UDCA dose and treatment duration, UDCA (and other drugs if any) administration for treatment or prevention purpose in DILI, type of liver damage and suggested benefit/therapeutic outcome.
No differences in response to UDCA were found regarding the cases had hepatocellular or cholestatic type of liver injury: 13/18 patients among cholestatic DILI cases and 8/10 among hepatocellular ones showed improvement after UDCA administration (Table 1).
Regarding the severity of DILI and implicated drug, 4 out of 7 cases who did not respond to UDCA were DILI cases due to AAS (2 hepatocellular and 2 cholestatic cases) with high TBL level (ranging from 38.6 to 58.3 mg/dl).
DILI diagnosis was performed by original authors. Most of DILI case reports had an extensive panel of serological, autoantibodies and image test and even biopsy findings to rule out alternative causes of liver injury before the DILI diagnosis, however only in two cases Roussel Uclaf Causality Assessment Method (RUCAM) (Danan and Benichou, 1993) was applied for DILI assessment (Gallelli et al., 2009; Abeles et al., 2020) (4 points, possible and 6 points, probable association to the drug, respectively) and in one case Naranjo scale (Naranjo et al., 1981) was applied (Agca et al., 2004) (probable relationship to the drug). Even assuming all of them are true DILI cases, none of the authors compared the time to resolution of their cases with other DILI cases not treated with UDCA. Despite that, most authors considered that the treatment with UDCA benefited the patients and that UDCA helped to improve and or resolve the liver damage in these patients.
Clinical Studies With Ursodeoxycholic Acid in the Drug-Induced Liver Injury Treatment or Prevention
Therapeutic Efficacy of Ursodeoxycholic Acid in Drug-Induced Liver Injury
Eight retrieved clinical studies with UDCA administration in DILI are presented in Table 2, with the following characteristics: author, type of the study, number of patients with DILI diagnosis and UDCA dosage, suspected/implicated drug for DILI, UDCA administration for treatment or prevention purpose in DILI, and suggested benefit/therapeutic outcome. DILI criteria of each included study, when provided, are also detailed in Table 2. Four studies with 91 DILI patients receiving UDCA evaluated its role in DILI treatment. Three were carried out in adult patients, while one was in pediatric population. Four other studies with 414 patients evaluated UDCA in DILI prevention, two in children and two in adult populations.
TABLE 2. Description of prospective and retrospective studies evaluating the role of ursodeoxycholic acid in the treatment and prevention of DILI.
In a study carried out by Wree et al. (2011), 15 patients with severe liver damage or acute liver failure induced by drugs or HDS were treated with corticosteroids 2–5 mg/kg/day [step-down therapy (N = 9)] or steroid pulse therapy (15–20 mg/kg/day) for 3 days/pulse (N = 6), and UDCA 750–1,500 mg/day (concomitantly in both groups) for several weeks (range 4–10 weeks). Aminotransferases and TBL levels decreased to <50% of peak values within 2 weeks, and normalized within 4–8 weeks. These patients in comparison with historical controls from the Drug-Induced Liver Injury Network (DILIN) were found to have a significantly more rapid decrease in TBL levels (Wree et al., 2011) (35).
Lang et al. (2019) evaluated the utility of UDCA in patients with tuberculosis (TBC) and DILI [defined as an increase in alanine aminotransferase (ALT) > 5 upper limit of normal (ULN), alkaline phosphatase (ALP) > 2 ULN or TBL> 2ULN] due to anti-TBC drugs in a prospective study but uncontrolled design. Thirty-nine out of 285 (9.5%) patients receiving anti-TBC drugs developed clinically relevant hepatotoxicity. Twelve were excluded from the analysis. Causes of exclusion were chronic liver disease, malnutrition, advanced chronic kidney disease, intolerability of anti-TBC drugs other than DILI and taking other potentially hepatoprotective drugs. In total 27 patients with DILI were treated with UDCA (250–500 mg/8 h with a later reduction to 250–500 mg/day until normalization of liver profile); drug dose was not reduced in any of these patients. Twenty-one patients showed a normalization in their liver profile, and 5 patients an important improvement in the liver tests, but only in one patient liver tests did not change. By comparison, all 12 patients excluded from the UDCA study showed no improvement or even progressed in the parameters of liver injury. However, this might be due to a selection of a sicker group of patients excluded from the UDCA study.
A Japanese retrospective study evaluated the role of hepatoprotective drugs [UDCA, stronger neo-minophagen C, and glycyrrhizin] in patients with DILI induced by anti-TBC drugs (Saito et al., 2016). In total 389 patients with active TBC were included in this study. Out of them, 43 patients developed mild DILI (ALT > 2 ULN and < 3 ULN), none of them stopped the anti-TBC treatment, and only 10 patients were treated with hepatoprotective drugs. The average time to normalization of aminotransferases was longer in the subgroup with hepatoprotective drugs. A moderate DILI (ALT between 3 and 5 ULN) developed in 5 patients (not included in the analysis due to the low number of patients) while 23 patients developed severe DILI (ALT > 5 ULN) and therefore discontinued the treatment. Among those with severe DILI, 17 received some hepatoprotective drugs. Results showed no differences in the average time to aminotransferases normalization in the group with severe DILI. However, the data analysis did not provide a clear data regarding the duration of treatment and dosage of UDCA. Moreover, the study failed to distinguish between the patients who were treated with UDCA or with other hepatoprotective drugs. These limitations made it impossible to conclude if a single or combined treatment with hepatoprotective drugs were the culprit of the apparent lack of therapeutic benefit of these therapies.
Asgarshirazi et al. (2015) in an uncontrolled clinical trial described pediatric patients with significant elevation (>2 ULN) in AST, ALT and gamma-glutamyltransferase (GGT) secondary to anticonvulsants confirmed at monthly follow up. Anticonvulsant drug doses were reduced or the treatment changed if possible and those patients who did not resolve liver tests despite that, were treated with UDCA (10–15 mg/kg/day) for at least 24 weeks (n = 22). The results showed a significant improvement of liver tests after treatment with UDCA although due to uncontrolled design of this study a firm conclusion cannot be drawn.
Role of Ursodeoxycholic Acid in Drug-Induced Liver Injury Prevention
The potential benefits of UDCA have been analyzed not only in the treatment of DILI but also for potential prevention. A Turkish study evaluated the effect of UDCA and vitamin E in preventing liver fibrosis in patients receiving chemotherapy (Bordbar et al., 2018). A total of 80 pediatric patients with B-cell acute lymphoblastic leukemia were randomized into 4 groups of treatment: vitamin E, UDCA (15 mg/kg/day), vitamin E + UDCA or control group (without UDCA and/or vitamin E except for chemotherapy). No differences were found regarding liver fibrosis among the groups. In the group treated with UDCA the results showed a trend to decrease in aminotransferase levels during the study and at 6 months after discontinuation of UDCA compared with baseline. Slight increase in TBL was found in the group treated with vitamin E only over the study period compared to the baseline levels.
A similar prospective randomized, open labelled parallel control pilot study was carried out in 39 pediatric patients receiving chemotherapy for acute lymphatic leukemia (Mohammed Saif et al., 2012). Considering the hepatotoxicity potential of various chemotherapy protocols, UDCA was investigated as hepatoprotective agent in terms of its safety and efficacy. Subjects were randomized into two groups according to the UDCA therapy allocation. The UDCA group consisted of patients who received UDCA (10–15 mg/kg/day) concomitantly with chemotherapy for 6 months, and were followed up for additional 3 months after UDCA discontinuation. The control group consisted of patients who received chemotherapy without UDCA and were followed up for 9 months in total (over treatment period and 3 months after). The results showed that in patients concomitantly treated with UDCA there was a trend toward decreased levels of aminotransferases. Also, there was a new increase in ALT after stopping UDCA during a follow-up period in the UDCA group.
A retrospective study evaluating the role of UDCA in 181 patients with prostate cancer treated with flutamide for preventing DILI has been undertaken (Kojima et al., 2002). Out of them only 70 patients were treated with UDCA (375 mg/day). A mild and moderate increase in hepatic aminotransferases were reported in 11.4% patients treated with UDCA but in 32.4% without it, which was a significant difference. Similarly, a severe increase in aminotransferases and clinically serious liver injury were only documented in patients without UDCA in comparison to those receiving UDCA in prevention dosage regime.
A pilot open label (Salmon et al., 2001) study of 114 patients with Alzheimer disease was also carried out. All the patients were treated with tacrine, out of whom, 14 patients were also treated with UDCA (13 mg/kg/day for 105 days). In 93% of patients in the UDCA group had normal ALT at the end of the study compared to 69% in those who did not received UDCA. Moderate hepatotoxicity (ALT between 1 and 3x ULN) only occurred in the control group (25%) while number of patients with ALT> 3xULN were similar in both groups (7 vs. 6%, respectively). Based on these results, the authors concluded that UDCA could prevent moderate tacrine-induced hepatotoxicity (Salmon et al., 2001).
Discussion
Ursodeoxycholic acid has been used empirically for a long time in cholestatic DILI with the aim to shorten the time to resolution.
The potential benefits of UDCA in DILI could be explained by the pathophysiological mechanism of UDCA in the liver. There is growing number of mechanistic studies conducted on UDCA that have yielded convincing evidence regarding UDCA-mediated hepatoprotection in cholestatic liver disease. In addition, cholestatic mechanisms often contribute to DILI, even when the clinical presentation is hepatocellular. In fact, DILI developed by bile salt export pump inhibition may present as hepatocellular pattern of liver injury, resulting in an important hepatocyte death and high elevation of aminotransferases and minimal increase in ALP and TBL (PSTC BSEP Webinar Series, 2006). For this reason, the mechanisms underlying the benefit of UDCA in cholestatic disease may reasonably apply in hepatocellular and mixed DILI.
Due to its hydrophilic nature and lack of membrane-disrupting properties UDCA seems to be nontoxic to hepatocytes even in high concentrations (Paumgartner and Beuers, 2004; Ashby et al., 2018). The exception was though found in a study of high dose UDCA in patients with primary sclerosing cholangitis (Lindor et al., 2009). Potential therapeutic mechanism of UDCA may be related to its ability to regulate hepatocytes apoptosis and survival, to exert membrane-stabilizing, antioxidative, and immunomodulatory effects (Mohammed Saif et al., 2012).
In vitro studies showed that UDCA affects expression of genes directly involved in the hepatocytes cycle and apoptosis (Castro et al., 2005; Ali et al., 2020), oxidative cell damage (Lapenna et al., 2002) and suppression of hepatic lipid peroxidation in experimental cholestatic liver disease (Ljubuncic et al., 2000).
Recently, work by Li et al. (2020) demonstrated a broad therapeutic potency of UDCA in the setting of liver injury induced by known hepatotoxic arsenious acid. UDCA was found to activate Nuclear factor erythroid-2-related factor 2 (Nrf2) pathway that plays an essential role in cellular defense against apoptosis, oxidative stress or promotes cell survival by activating antioxidant cascades (Li et al., 2020). Finally, it has been described that UDCA binds to glucocorticoid receptor that could mediate its anti-inflammatory and immunomodulatory effects (Miura et al., 2001). However, the relevance of these proven UDCA effects in vitro needs to be confirmed in vivo and in the clinical setting.
Experimental results showed that antiapoptotic (Amaral et al., 2007) and antioxidative (Uraz et al., 2008) properties of UDCA might explain hepatoprotective effects of UDCA against methotrexate induced liver injury in some clinical studies (Mohammed Saif et al., 2012; Bordbar et al., 2018). Similarly, in animal models of DILI induced by ceftriaxone (Alhumaidha et al., 2014) or combination of anti-TBC drugs isoniazid plus rifampicin (Chen et al., 2011), hepatoprotective effects of UDCA were shown by preservation of liver histology, decrease in liver enzymes, elevation of antioxidant glutathione content and decrease of malondialdehyde and nitric oxide.
Despite the potential role of UDCA in prevention or treatment of DILI in humans, early and sensitive biomarkers of its therapeutic response are still lacking. In a recent metabolomic study, it has been shown that microRNA-122 (miR-122) could be considered as an early biomarker of DILI (Lee et al., 2017). The miR-122 is the most prevalent miRNA (approximately 70%) in the adult liver (Bandiera et al., 2015), and is involved in regulation of liver transcription factors and maintaining hepatocyte life cycle (Vincent and Sanyal, 2014). The results also demonstrated that UDCA significantly decreased miR-122 (Kim et al., 2019) levels indicating UDCA as an potential agent in ameliorating or preventing DILI in humans, and miR-122 as a potentially reliable early biomarker of DILI. UDCA seems to prevent apoptosis in hepatocytes at the mitochondria level and protect cholangiocytes against the toxic action of endogenous bile acids (Beuers, 2006; Beuers et al., 2015).
Although most studies analyzed in the current systematic review suggest a positive therapeutic and protective role of UDCA, it does not allow us to conclude on definite dose regime of UDCA in treating or preventing DILI. We found that the therapeutic efficacy of UDCA in the treatment of DILI was beneficial with lower dose range of 250–500 mg/day as well as with 750–1,500 mg/day (up to 45 mg/kg/day) over at least 4 weeks up to several months depending of the causative drug and severity of DILI, administered as a single treatment or concomitantly with other hepatoprotective agents. Similarly, therapeutic outcomes in the DILI prevention with UDCA were inconsistent, and most of them were achieved with wider dose range of UDCA (most commonly 10–15 mg/day) over the entire treatment with known hepatotoxic drugs, but the dosing was frequently increased based on assessed liver tests.
Our systematic review had certain limitations. These clinical studies show large heterogeneity in methodology and the criteria for DILI diagnosis, the time of initiation and duration of treatment, and UDCA dose regime in terms of single and daily doses. Furthermore, design of the studies reviewed either retrospective or prospective was mostly without a control group. Numerous anecdotal case reports and most of the case series had serious methodological weaknesses which makes it almost impossible to conclude on the efficacy of UDCA in patients with DILI. Also, making definite conclusion on the efficacy of UDCA in DILI treatment is difficult to distinguish due to often concomitant administration of potential hepatoprotective agents.
DILI is a rare adverse effect and resolves in most cases spontaneously without much morbidity and a very low mortality. However, in some patients, recovery is slow and they can suffer from itching, general weakness and low energy level for many weeks or months.
Given the state of the existing knowledge based on the extensive preclinical research where therapeutic potency of UDCA in DILI has been demonstrated, it is necessary to explore further mechanisms of UDCA in clinical studies. In order to definitely elucidate UDCA efficacy in the treatment of patients with DILI, a randomized clinical trial controlled with placebo should be initiated in multicenter settings and last long enough to reach the necessary number of patients. The groups should be evenly distributed by type of liver injury (hepatocellular, cholestatic and mixed) and by severity (mild, moderate severe) as defined by a Expert International Consensus Meeting in 2011 (Aithal et al., 2011). The main endpoints need to be significant decline (i.e., 50% vs. baseline) of liver enzymes (ALT, AST, ALP and TBL), time to complete normalization of liver enzymes and rate of survivals as well as DILI relapse rate after UDCA withdrawal and its safety profile. Due to heterogeneity of the affected patients, inclusion criteria should be focused on the patients with clinical diagnosis of DILI defined as ALT ≥ 5 x ULN, ALP ≥ 2 x ULN or ALT ≥ 3xULN plus TBL >2 xULN (Aithal et al., 2011) and RUCAM score (Danan and Benichou, 1993), at least, possible (≥3).
In this review, we summarized the history and current status of UDCA use in prevention and treatment of DILI, explored the culprit drugs and the patients who may benefit from UDCA therapy, and presented weakness of the available results of UDCA treatment of DILI. Relatively often empiric use of UDCA in DILI appears to be safe and leads to a reduction in bilirubin and transaminase levels. Therefore, our current observations promise a strong base for in-depth clinical investigations into its efficacy (both in prevention and treatment) in patients with confirmed DILI.
Data Availability Statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.
Author Contributions
MR-D, LN, VV-A and EB contributed to the conception and design of the systematic review. MR-D, LN and VV-A contributed to the initial electronic literature search, study eligibility assessment, data extraction and quality and risk of bias assessment, and analysis and interpretation. MR-D, LN and VV-A drafted the manuscript. EB critically revised the manuscript. All authors approved the final version of the manuscript.
Funding
The present study has been supported by grants of the Instituto de Salud Carlos III co-founded by Fondo Europeo de Desarrollo Regional–FEDER (contract number: PI 18-00901), the Consejería de Salud de la Junta de Andalucía (PI-0274/2016; Acción B de refuerzo investigador del SAS Expediente B-0002-2019; UMA18-FEDERJA-193) and by the Agencia Española del Medicamento. CIBERehd is funded by Instituto de Salud Carlos III. This article is based upon work from COST Action “CA17112–Prospective European Drug-Induced Liver Injury Network” supported by COST (European Cooperation in Science and Technology). www.cost.eu MR-D, LN, VV-A and EB are members of COST Action CA17112.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s Note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Acknowledgments
We appreciate their contribution to Camilla Stephens, Ismael Álvarez Álvarez, Hao Niu, Zeus Pérez Valdés, Antonio Segovia Zafra and M Isabel Lucena.
Abbreviations
AAS, androgenic anabolic steroid; ALP, alkaline phosphatase; ALT, alanine aminotransferase; AST, aspartate aminotransferase; CLD, chronic liver disease; DILI, drug-induced liver injury; DILIN, Drug-Induced Liver Injury Network; ERCP, endoscopic retrograde cholangiopancreatography; GGT, gamma-glutamyl transferase; HDS, herbal and dietary supplements; INR, international normalisation ratio; miR-122, microRNA-122; NAC, N-acetylcysteine; PBC, primary biliary cholangitis; RCT, randomized clinical trials; RUCAM, Roussel Uclaf Causality Assessment Method; TBC, tuberculosis; TBL: total bilirubin level; UDCA, ursodeoxycholic acid; ULN, upper limit of normal; VBDS: vanishing bile duct syndrome.
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Keywords: ursodeoxycholic acid, drug-induced liver injury, hepatotoxicity, treatment, prevention
Citation: Robles-Díaz M, Nezic L, Vujic-Aleksic V and Björnsson ES (2021) Role of Ursodeoxycholic Acid in Treating and Preventing Idiosyncratic Drug-Induced Liver Injury. A Systematic Review. Front. Pharmacol. 12:744488. doi: 10.3389/fphar.2021.744488
Received: 20 July 2021; Accepted: 20 September 2021;
Published: 27 October 2021.
Edited by:
Thomas Brzozowski, Jagiellonian University Medical College, PolandReviewed by:
James. H Lewis, MedStar Georgetown University Hospital, United StatesMinjun Chen, National Center for Toxicological Research (FDA), United States
Robert Fontana, University of Michigan, United States
Copyright © 2021 Robles-Díaz, Nezic, Vujic-Aleksic and Björnsson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Mercedes Robles-Díaz, bXJvYmxlc0B1bWEuZXM=
†These authors have contributed equally to this work and share first authorship