Review Article Characteristics and Mechanism of Liver Injury in 2019
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| Review Article Characteristics and Mechanism of Liver Injury in 2019 Coronavirus Disease Jie Li
1 and Jian-Gao Fan* 2,3 1
’nan, Shandong, China; 2 Department of Gastroenterology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China; 3 Shanghai Key Lab of Pediatric Gastroenterology and Nutrition, Shanghai, China Abstract An outbreak of severe acute respiratory syndrome coronavi- rus 2 (SARS-CoV-2) infection (2019 coronavirus disease, COVID-19) since December 2019, from Wuhan, China, has been posing a significant threat to global human health. The clinical features and outcomes of Chinese patients with COVID-19 have been widely reported. Increasing evidence has witnessed the frequent incident liver injury in COVID-19 patients, and it is often manifested as transient elevation of serum aminotransferases; however, the patients seldom have liver failure and obvious intrahepatic cholestasis, unless pre- existing advanced liver disease was present. The underlying mechanisms of liver injury in cases of COVID-19 might include psychological stress, systemic inflammation re- sponse, drug toxicity, and progression of pre-existing liver diseases. However, there is insufficient evidence for SARS- CoV-2 infected hepatocytes or virus-related liver injury in COVID-19 at present. The clinical, pathological and labora- tory characteristics as well as underlying pathophysiology and etiology of liver injury in COVID-19 remain largely unclear. In this review, we highlight these important issues based on the recent developments in the field, for optimizing the manage- ment and treatment of liver injury in Chinese patients with COVID-19. Citation of this article: Li J, Fan JG. Characteristics and mech- anism of liver injury in 2019 coronavirus disease. J Clin Transl Hepatol 2020;8(1):13 –17. doi: 10.14218/JCTH.2020.00019. Introduction In December 2019, a novel coronavirus (2019-nCoV), named as severe acute respiratory syndrome coronavirus 2 (SARS- CoV-2), was discovered in Wuhan, Hubei Province, China. 1 –3
2019 (COVID-19), has aroused great concern worldwide. The global outbreak of this disease is significantly bigger than the prior pandemic of SARS and Middle East respiratory syndrome (MERS). Within 3 months, SARS-CoV-2 spread rapidly from Wuhan city to the entire country of China, and then into more than 120 countries worldwide. Up to March 14, 2020, a total of 81,021 cases of COVID-19 with 3194 deaths in China and 63,016 cases with 2212 deaths outside of China have been confirmed. Unfortunately, the global numbers of both infected patients and fatalities will continue to grow in the future months because no specific effective antiviral therapies nor vaccine have been identified. 4 With the number of cases increasing in China, abnormal liver function test results have been observed in some patients with COVID-19, making this organ the most fre- quently damaged outside of the respiratory system. 5 –7 However, the
clinical characteristics and outcomes of Chinese patients with COVID-19 might be changing with time, and the clinical-pathological manifestations and mech- anism of the liver injury in COVID-19 remain largely unclear. 8 This review will summarize these important issues based on the recent developments in the field, for optimizing the management and treatment of COVID-19 patients with liver injury. General clinical characteristics and outcomes of Chinese patients with COVID-19 The clinical features of COVID-19 are similar to SARS and MERS, with typical manifestation of pneumonia and acute respiratory infection symptoms (Fig. 1). Most patients with SARS-CoV-2 infection usually have mild symptoms and good prognosis, with the exception of those involving patients with older age and underlying health conditions. Guan et al. 9 extracted data regarding 1099 patients with laboratory-con- firmed COVID-19 from 552 hospitals in mainland China through January 29, 2020. They reported that the median age of the cases was 47 years, and 41.9% of the patient population was female. The most common symptoms were fever (88.7%) and cough (67.8%). However, nausea or vom- iting (5.0%) and diarrhea (3.8%) were present but uncom- mon. The median incubation period was 4 days, and 23.7% cases had at least one coexisting comorbid condition. Some patients rapidly developed severe pneumonia, pulmonary edema, acute respiratory distress syndrome (ARDS), acute respiratory failure, or multiple organ failure. The primary composite end-point occurred in 67 cases (6.1%), including 5.0% patients admitted to the intensive care unit (ICU), 2.3% Journal of Clinical and Translational Hepatology 2020 vol. 8 | 13 –17 13
permits noncommercial unrestricted use, distribution, and reproduction in any medium, provided that the following statement is provided. “This article has been published in Journal of Clinical and Translational Hepatology at DOI: 10.14218/JCTH.2020.00019 and can also be viewed on the Journal ’s website at http://www.jcthnet.com”. Keywords: SARS-CoV-2; COVID-19; Liver injury; Clinical characteristics; Mechanism. Abbreviations: 2019-nCoV, 2019 novel coronavirus; ACE2, angiotensin convert- ing enzyme 2; ALT, alanine aminotransferase; ARDS, acute respiratory distress syndrome; AST, aspartate aminotransferase; CFR, case-fatality rate; COVID-19, 2019 coronavirus disease; ICU, intensive care unit; MERS, Middle East respiratory syndrome; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2. Received: 9 March 2020; Revised: 13 March 2020; Accepted: 15 March 2020 *Correspondence to: Jian-Gao Fan, Department of Gastroenterology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai Key Lab of Pediatric Gastroenterology and Nutrition, Shanghai 200092, China. Tel: + 86-21-2507-7340, E-mail: fanjiangao@xinhuamed.com.cn patients who underwent invasive mechanical ventilation, and 1.4% patients who died. Recently, the Chinese Center for Disease Control and Prevention published the largest case series to date of COVID-19 in mainland China. Among 72,314 case records (updated through February11, 2020), 44,672 (62%) were classified as confirmed cases of COVID-19, 16,186 (22%) as suspected cases, 10,567 (15%) as clinically-diagnosed cases, and 889 (1%) as asymptomatic cases. In total, 87% of the cases represented ages 30 to 79 years-old. Among 44,415 confirmed cases, 14% cases were classified as severe and 5% as critical. There were 1023 deaths (2.3%) among the 44,672 confirmed cases, all having involved critical cases. The case-fatality rate (CFR) was 8.0% in those aged 70 to 79 years and 14.8% in those aged 80 years and older. The CFR was elevated among those with underlying diseases (10.5% for cardiovascular disease, 7.3% for mellitus diabetes, 6.3% for chronic respiratory disease, 6.0% for hypertension, and 5.6% for cancer). 10 However, the information regarding coex- isting liver disease and liver-related morbidity and mortality were not available in either article. Furthermore, in a systematic review of 3470 patients with COVID-19, 11.5% were admitted to ICU, while the overall CFR was 3.7%. Compared to patients admitted outside of Hubei, China, those from Hubei had a significantly higher ICU admission rate (21.9% vs. 2.5%). Also, CFR attributed to COVID-19 in Hubei was significantly higher than that of non- Hubei admissions (10.4% vs. 0.6%). 11 Characteristics of liver injury in Chinese patients with COVID-19 Laboratory changes of liver function test in patients with COVID-19 According to the diagnostic criteria, all hospitalized cases of COVID-19 were laboratory confirmed as SARS-CoV-2 infection by nucleic acid testing of respiratory tract samples. On admis- sion, most of the patients with COVID-19 had lymphocytopenia, leukopenia, and elevated levels of C-reactive protein. Severe patients usually had blood oxygen saturation of <93%, and partial pressure of arterial oxygen to fraction of inspired oxygen ratio of <300. Severe hypoxemia and acute respiratory failure usually occurred in the critical cases. Furthermore, the severe or critical patients still had laboratory characteristic findings of septic shock and multiple organ dysfunction or failure, such as liver injury, renal injury, and heart injury (Fig. 2). Abnormal liver enzymes in patients with COVID-19 was first reported by Chen et al. 2 Among 99 cases with COVID-19 from Wuhan, 43 cases (43.4%) had increased serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and lactic dehydrogenase. Most of them had mild eleva- tion of aminotransferase, and only one case had very high levels of aminotransferases (ALT of 7590 U/L and AST of 1445 U/L). However, no case was reported with the features of obvious intrahepatic cholestasis or liver failure. Holshue et al. 12 reported the first Chinese case of COVID-19 confirmed in the USA with detailed information of liver function tests. The patient was admitted to hospital on day 4 of illness and progressed to pneu- monia on day 9 of illness, and his serum levels of ALT increased from 68 to 203 U/L and AST increased from 37 to 89 U/L. In another report, among 12 severe patients with COVID-19 from Shenzhen, only 1 had abnormal liver enzymes (ALT of 107 U/L and AST of 62 U/L). 13 In 62 patients with COVID-19 from Zhe- jiang, 16.1% patients had elevation of AST ( $40 U/L) and the mean ALT level was 22 U/L. 14 Among 305 patients with COVID- 19 from Wuhan, 39.1% (119/304) cases had elevation of ALT, AST, or bilirubin at admission. Of them, 24 cases had increased ALT ( $80 U/L) and 19 had increased AST ($80 U/L), while only 6 had increased bilirubin level. 15 Recently, increasing evidence has highlighted the close relationship of abnormal liver biochemistries with severity of COVID-19. In the cohort of 1099 patients with COVID-19 from mainland China, 39.4% had AST >40 U/L and 28.1% had ALT >40 U/L, and most of them occurred in severe and critical cases. 9 The mean levels of serum ALT, AST, and bilir- ubin in severe or critical cases were significantly higher than those in control cases in another multicenter retrospective study including 32 patients. 16 Serum levels of ALT and AST in severe to critical cases were significantly higher than those in mild to moderate cases among 265 patients with COVID-19 from Shanghai. 17 Similarly, patients admitted to the ICU were more likely to have high levels of serum ALT, AST, and total bilirubin. 18,19 Fig. 1. Clinical symptoms of patients with 2019 coronavirus disease. Fig. 2. Complications and disease mechanisms in patients with 2019 co- ronavirus infection. 14 Journal of Clinical and Translational Hepatology 2020 vol. 8 | 13 –17 Li J. et al: Liver injury in COVID-19 In 52 critically ill patients with multiple organ damage, 35 (67%) had ARDS, 15 (29%) had acute kidney injury, 15 (29%) had liver injury, and 12 (23%) had cardiac injury. 20 Among 298 patients with COVID-19 from Shenzhen, the per- centage of liver injury in the severe group was substantially higher than that in the non-severe group. 21 However, signifi- cant differences of serum levels of ALT, AST and total bilirubin between patients with and without ARDS were not found in a small sample cohort study from Wuhan. 22 In addition, abnor- mal liver function test in cases of COVID-19 is often transient and often simultaneously combined with increased enzymes from muscle and heart; these laboratory changes can return to normal without liver-related morbidity and mortality. Pathological changes of liver in Chinese patients who died from COVID-19 The reported point CFR of COVID-19 patients in mainland China has varied widely, mainly based on the geographic locality and the observation time. To date over 3100 patients have died from COVID-19 in mainland China, all of them belonging to the critical cases. However, only several cases have undergone autopsies or post-mortem tissue biopsies. Xu et al. 23 first reported the pathological characteristics of post-mortem biopsy specimens from a 50-year-old man who died from critical COVID-19. The results showed moder- ate microvascular steatosis and mild lobular and portal activ- ity in the liver. Liu et al. 24 performed several cases of autopsies in Wuhan, China, and concluded that the histolog- ical characteristics of COVID-19 focuses on the lungs and without sufficient evidence for other organ obvious injuries. The autopsy results of the liver include hepatomegaly with dark red, hepatocyte degeneration accompanied by lobular focal necrosis and neutrophil infiltration, infiltration of lym- phocytes and monocytes in the portal area, and congestion of hepatic sinuses with microthrombosis. However, neither histological features of liver failure nor bile duct injuries have been observed in these deceased cases. Pathogenesis and etiology of liver injury in patients with COVID-19 Systemic inflammatory responses and pulmonary injury associ- ated with coronaviruses are triggered by the innate and adaptive immune system. Expression of SARS-CoV S protein in animals is associated with strong inflammatory reaction and enhanced hepatitis. During SARS-CoV infection, host factors trigger an immune response, which can inhibit virus replication, promote virus clearance, and trigger a prolonged adaptive immune response against the viruses. In SARS-CoV-infected patients, CD4 +
specific antibodies. A large amount of CD8 + T cells can be found in the pulmonary interstitium, which play a vital role in clearing the coronaviruses in infected cells and inducing immune injury. 25 However, it is important to note that an immune response out of control can induce immunopathogenesis, which may result in lung tissue damage and functional impairment in COVID-19 patients. However, reports about the underlying immune mecha- nism of liver injury in COVID-19 are still limited. Coronavirus-related liver injury in COVID-19 Abnormal liver biochemistries have also been reported in patients with SARS and MERS, 26,27
implying that potential liver injury is closely associated with corona virus infection. But it ’s unclear whether the liver injury can be caused directly by the coronavirus itself. It is well known that SARS-CoV-2 is closely related to SARS-CoV, and they share the same recep- tor, angiotensin converting enzyme 2 (ACE2), and lung is the main target organ of the corona virus infection. Previous RNA- seq data in the human protein atlas database demonstrates expression of ACE2 in the liver. 28 However, only a low fre- quency of ACE2 expression is observed in cholangiocytes, but not in hepatocytes, Kupffer cells, and endothelial cells. 29 Recently, the single-cell RNA-seq data from two independent cohorts suggest cholangiocyte-specific expression of ACE2 in human liver samples. Similarly, single cell sequencing and immunohistochemistry study showed that ACE2 was only expressed in bile duct epithelial cells of normal liver tissues, and very minimally in hepatocytes. In a mouse model of acute liver injury with partial hepatectomy, ACE2 expression in the liver was down-regu- lated on the first day, but it was elevated up to twice of the normal level on the third day and returned to normal level on seventh day when the liver recovered and hepatocyte pro- liferation stopped. The experimental results implied the up- regulation of ACE2 expression in the liver was caused by compensatory proliferation of hepatocytes derived from bile duct epithelial cells during acute liver injury. 30,31 Considering the COVID-19 patients with liver injury mainly manifested as elevation of serum aminotransferases but alkaline phospha- tase, SARS-CoV-2 might or might not affect the cholangio- cytes through ACE2 damage to the hepatocytes. Liver injury in COVID-19 may thus have alternative pathophysiology and etiology. Stress and systemic inflammation-related liver injury in COVID-19 Under physiological conditions, the liver is the important organ that meets and filters a large amount of alien material, and then maintains immune tolerance through gut-liver axis. However, immune tolerance is interrupted under psycholog- ical stress conditions in patients with severe COVID-19. Hyperactivated immune responses and cytokine storm- related systemic inflammation in SARS-CoV-2 infection can affect and damage many organs, including the gut and liver. Peripheral blood levels of Th17 and CD8 T cells, interleukin-2, interleukin-6, interleukin-7, interleukin-10, tumor necrosis factor- a, granulocyte-colony stimulating factor, interferon- inducible protein-10, monocyte chemotactic protein 1, mac- rophage inflammatory protein 1 alpha in severe patients were significantly higher than those in control patients. 18,21,22,32,33 In the same way, abnormal liver biochemistries have also occurred often in severe COVID-19 cases. Stress-induced liver injury might be associated with hypoxia-reoxygenation, over-activation of Kupffer cells and oxidative stress, intestinal endotoxemia, and activation of the sympathetic nervous and adrenocortical system in COVID-19 patients. Sepsis is not uncommon in severe and critical COVID-19 cases, especially in patients with intestinal microflora imbal- ance and existing liver cirrhosis. 34 Sepsis is a dysregulated immune response to an infection that leads to psychological stress and multiple organ dysfunction. 35 The pathophysiology of sepsis-related liver injury includes hypoxic liver injury due to ischemia and shock, cholestasis due to altered bile metab- olism, hepatocellular injury due to drug toxicity or over- whelming
inflammation. 36 Hence, sepsis in COVID-19 Journal of Clinical and Translational Hepatology 2020 vol. 8 | 13 –17
15 Li J. et al: Liver injury in COVID-19 patients might be one of the etiologies of liver injury and sub- stantially impairs the prognosis of COVID-19. Furthermore, severe hypoxia and hypovolemia are the major cause of ischemic/hypoxic liver injury in COVID-19 cases with acute lung failure and/or shock. Ischemic/hypoxic liver injury is associated with metabolic acidosis, calcium overloading, and changes of mitochondrial membrane permeability, and has thus far usually manifested as very high aminotransferase concentrations in serum. 37 Drug-induced liver injury or existing liver disease in COVID-19 Moderate microvascular steatosis with mild hepatic inflam- mation in a COVID-19 patient indicates the possibility of drug- induced liver injury. 23 In clinical practice, a large number of patients had history of using antipyretic drugs for treatment of fever. 38 Most antipyretic drugs contain paracetamol, which is generally recognized as a common reason for liver injury. 39 In addition, many patients with COVID-19 have history of simultaneous use of multiple antiviral drugs, i.e. oseltamivir, abidol, and lopinavir/ritonavir. 40,41 These antiviral drugs can induce liver injury as well. A clinical trial of lopinavir/ritonavir or abidol for treatment of COVID-19 from Shanghai showed that two cases of each group occurred liver injury among two- hundred and sixty-two patients. 42 Thus, if abnormality of liver enzymes occurs after using a hepatotoxic drug, drug-induced liver injury should first be confirmed or ruled out. In addition, given the high burden of chronic liver disease in China, non- alcoholic fatty liver disease, chronic hepatitis B, and liver cir- rhosis might be the major alternative causes of liver injury in Chinese patients with COVID-19. 43 SARS-CoV-2 infection and related immune changes might be regarded as a “second hit” to simple fatty liver, and can induce incident liver injury and steatohepatitis. Stress and sepsis are particularly problematic in cirrhotic patients, as either can trigger acute-on-chronic liver failure. However, the information of pre-existing liver diseases has not been outlined in most studies of COVID-19 and the interaction between existing liver disease and SARS- CoV-2 infection has not yet been studied. 36 Summary and future perspective In conclusion, the SARS-CoV-2 infection outbreak has become a global threat to human health over the past 3 months. The COVID-19 disease itself can result in severe and even fatal respiratory diseases, and in mainland China 2.3% of CFR is attributed to ARDS and multiple organ failure. Increasing evidence has demonstrated frequent incident liver injury in COVID-19, especially in patients with multiple organ injury. The liver injury itself has often manifested as transient elevation of serum aminotransferases. However, acute liver failure and obvious intrahepatic cholestasis have been reported in the available studies, but seldomly preva- lence of abnormal aminotransferases is significantly higher in severe cases than in mild cases, according to many studies of COVID-19. The underlying mechanisms of liver injury in cases of COVID-19 might include psychological stress, systemic inflammation response, drug toxicity, and progression of pre- existing liver diseases, i.e. from simple fatty liver to steato- hepatitis. Currently, there is insufficient evidence for SARS- CoV-2 infected hepatocytes or virus-related liver injury in COVID-19 patients, and it is difficult to summarize the role of the immune system in causing liver damage by the virus at present. Therefore, the pathophysiology and implication of liver injury have not yet been fully determined in COVID-19, as reports about liver injury as well as underlying mecha- nisms are limited. Being that liver is the most frequently affected outside of the respiratory system in COVID-19, more intensive surveil- lance or individually tailored therapeutic approaches is needed for severe cases, especially among those with pre- existing advanced liver disease. Mechanistic understanding of the relationship of SARS-CoV-2 infection with liver injury is important for the clinical practice of managing COVID-19 patients with hepatic injury. Further study should focus on the mechanism of incident liver injury in COVID-19 and the effect of underlying liver disease on treatment and outcome of COVID-19 in the future. Funding Dr. Jie Li wishes to acknowledge support from the National Science and Technology Major Project of China (2018ZX 10302206-001-006), National Natural Science Foundation of China (81970545), Shandong Province Natural Science Foundation (ZR2017MH102), and Shandong Province Key Research and Development Project (2019GSF108145). Dr. Jian-Gao Fan wishes to acknowledge support from the National Key R&D Program (2017YFSF090203), National Natural Science Foundation of China (81873565), Shanghai Leading Talent Plan 2017, and Innovative Research Team of High-Level Local Universities in Shanghai. Conflict of interest The authors have no conflict of interests related to this publication. Author contributions Writing the manuscript (JL), developing the idea for the article and critically revising it (JGF). All authors read and approved the final version of the manuscript. References [1] Wu Z, McGoogan JM. Characteristics of and Important Lessons From the Coronavirus Disease 2019 (COVID-19) Outbreak in China: Summary of a Report of 72314 Cases From the Chinese Center for Disease Control and Prevention. JAMA 2020. doi: 10.1001/jama.2020.2648. [2] Chen N, Zhou M, Dong X, Qu J, Gong F, Han Y, et al. 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