Abstract
On December 30th 2019, some patients with pneumonia of unknown etiology were reported in the Program for Monitoring Emerging Diseases (ProMED), a program run by the International Society for Infectious Diseases (ISID), hypothesized to be related to subjects who had had contact with the seafood market in Wuhan, China. Chinese authorities instituted an emergency agency aimed at identifying the source of infection and potential biological pathogens. It was subsequently named by the World Committee on Virus Classification as 2019-nCoV (2019-novel coronavirus) or severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A number of studies have demonstrated that 2019-nCoV and the SARS-CoV shared the same cell entry receptor named angiotensin-converting enzyme 2 (ACE2). This is expressed in human tissues, not only in the respiratory epithelia, but also in the small intestines, heart, liver, and kidneys. Here, we examine the most recent findings on the effects of SARS-CoV-2 infection on kidney diseases, mainly acute kidney injury, and the potential role of the chemokine network.
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Introduction
Coronaviruses are a family of pathogens infecting humans as well as other vertebrates and is, therefore, of great clinical and veterinary importance [1]. In 1983 Siddell et al. reported that Coronavirions are pleomorphic, generally spherical, 60 to 220 nm in diameter and are characterized by widely spaced, club-shaped surface projections about 20 nm in length [2]. Complete virions have a density in sucrose of approximately 1.18 g/ml [2]. The coronavirus genome is a linear molecule of single-stranded RNA. Additionally, the coronavirius nucleocapsid contains a non-glycosylated protein of 50,000 to 60,000 molecular weight [2]. It has been reported that Coronaviruses cause a large spectrum of diseases in humans and animals which can be largely categorized into two classes based on its respiratory or enteric tropisms [3]. It has been ascertained that their pathogenic potential ranges from respiratory and gastrointestinal diseases to hepatitis, encephalomyelitis, vasculitis and coagulopathies [4]. In several viral diseases, such as Dengue haemorrhagic fever, Yellow fever and some Human Immunodeficiency Virus (HIV) infection, an augmentation of pathology by the antibody response through deposition of immune complexes or antibody-mediated enhancement of infectivity. Chronic inflammation elicited by feline coronavirus infections represents an interesting virus-host system in which such mechanisms can be investigated. Several coronavirus-induced disease processes are driven or accompanied by immunopathological mechanisms (i.e. feline infectious peritonitis, a management problem in catteries). This antibody- and C’-mediated disease process displays interesting mechanistic parallels to other significant viral diseases in humans, such as hemorrhagic shock syndromes and damage to the lymphoreticular system. These viruses provide interesting experimental models by emulating complex disease processes and may represent an unrecognized threat in biomedical sciences. In contrast, murine coronavirus infections in rodents have been developed as helpful models for virus persistence and chronic infection [3, 5]. Late 2019, a report of a cluster with pneumonia of unknown etiology was reported and subsequently named by the World Committee on Virus Classification as 2019-nCoV or the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) [6,7,8,9]. This novel coronavirus is hypothesized to be related to contact with a seafood market in Wuhan City, China [10]. In response, hospitals in the region held an emergency symposium, and federal agencies worked towards determining the source of infection and causative organism. On January 5th 2020, the World Health Organization (WHO) published a summary outlining their requests for further information from Chinese public health authorities, and reported a total of 44 patients with “pneumonia of unknown etiology” and 121 close contacts under surveillance. The WHO reported that 11 patients were severely ill, and many of affected those had had contact with the Huanan Seafood market [10]. Patients were reported to have symptoms such as fever, dyspnea and pulmonary infiltrates on chest radiographs. The virus predominantly spreads through respiratory droplets and close contact [9, 11,12,13] and concerningly, it has been reported that a large number of health care workers were infected during the initial phases of the pandemic in the city of Wuhan, China [11]. The virus is rapidly spreading from its origin to the rest of the world [14,15,16]. The rapidly expanding 2019-nCoV pandemic, caused by SARS-CoV, has challenged the medical community to an unprecedented degree [11]. Here, we briefly discuss the most recent findings on the main effects of SARS-CoV-2 infection on kidney diseases, mainly acute kidney injury, and the potential role of chemokine network.
SARS-CoV-2 and the kidney
It is known that 2019-nCoV predominantly affects the respiratory system with manifestations ranging from upper respiratory symptoms to acute respiratory distress syndrome (ARDS) [17]. Xu et al. [18] have investigated the clinical manifestations and imaging characteristics [computed tomography (CT)] in novel coronavirus pneumonia (NCP) caused by SARS-CoV-2, as disease defined on 8th February 2020 in China [18]. They concluded that CT imaging presentations of NCP are predominantly patchy ground-glass opacities in the peripheral zones under the pleura with partial consolidation, which will be reabsorbed with the formation of fibrotic strips. As a consequence, CT scan provides an important base for early diagnosis and treatment of NCP [19, 20]. It has been reported that patients with mild disease may have only low-grade fever and weakness without pneumonia, whereas severe patients will have dyspnea and/or hypoxemia, and those with critically severe illness will quickly progress to acute respiratory distress syndrome, septic shock, uncorrectable metabolic acidosis, coagulation dysfunction and death. Contrary to infection with SARS-CoV-2 and H7N9 avian influenza, which results in a high fever at the onset of infection, the initial symptoms of SARS-CoV-2 infection are atypical with only low-grade fever and long incubation period providing potent infective capabilities [21, 22].
Several studies have shown that 2019-nCoV and the SARS-CoV shared the same cell entry receptor, angiotensin-converting enzyme 2 (ACE2) [23]. It has been hypothesized that the ACE2 expression pattern in different organs, tissues, and cell types could be related to the risk pattern of 2019-nCoV infection [23]. It has been shown that ACE2 expression in humans is not only restricted to the epithelia of the lung, but also found in the small intestine, heart, liver, and kidneys [24]. Gu et al. [25] in autopsy specimens obtained from SARS affected patients found that immunohistochemical examination revealed SARS-CoV virions, RNA, and antigens in lung and other organs, including the kidney. Pacciarini et al. [26] established in vitro that association of SARS-CoV in proximal tubular epithelial cells in 31 cases showed persistent and productive infections, which were partially correlated with ACE2 expression. Moreover, using state-of-the-art single-cell techniques, Zou et al. [27] stratified organs into high and low risks according to the expression level of ACE2 concluding that the kidney should be listed as high risk. These findings indicate the possibility of 2019-nCoV infections in kidney cells. Epidemiological data indicate that over two-thirds of patients who died from 2019-nCoV had diabetes or cardiovascular disease [28]. Most patients with these diseases undergo to angiotensin-receptor blockers (ARBs) treatment. Several studies have shown that ARBs are able to increase ACE2 expression in the kidney and the heart [29]. It has been shown that SARS-CoV-2 entry into target cells is a highly regulated multi-step processes, of which binding to ACE2 is merely the first. TMPRSS2 (Transmembrane Serine Protease 2) is an essential serine protease required for spike glycoprotein priming after binding to ACE2. Increased expression of ACE2 by ARBs may induce the sequestration of SARS-CoV-2 in the cell membrane; however, this may not be paralleled by an increase in TMPRSS2, which could act in limiting viral infection. Additionally, membrane-bound ACE2 is processed by the metalloproteinase ADAM17, which cleaves the ACE2 ectodomain to allow the release of a soluble form. Although the overall effects on urological patients of delayed treatment and diagnosis remain to be defined, Perico et al. have reported that the available epidemiological data indicate that acute kidney injury (AKI) is one of the main indicators of prognosis of 2019-nCoV, and diabetes is the main renal co-morbidity [29]. The potential impact of 2019-nCoV on patients affected by other renal conditions, such as end-stage renal disease and transplantation, is still not clear at this phase of the pandemic [29]. Interestingly, analysis of peripheral blood samples from hemodialysis patients infected with SARS-CoV-2 showed a remarkable reduction in the numbers of T-lymphocytes, T-helper cells, and Natural Killer (NK) T-lymphocytes, as well as lower serum levels of inflammatory cytokines, compared to non-hemodialysis patients with 2019-nCoV. Collectively, this study reported that hemodialysis patients with 2019-nCoV are more likely to experience mild disease and lower rates of progression towards pneumonia, likely secondary, to the reduced immune function and decreased cytokine storms [29]. Additionally, the risk of acquiring 2019-nCoV from organ donation is low. However, it has been shown that SARS-CoV-2 has a high tropism for the kidney, where it has been shown to replicate in almost 30% of 2019-nCoV 19 patients. For this reason, screening for 2019-nCoV in kidney donors should be strongly considered. Additionally, living donors who have clinical manifestations or have travelled to high-risk areas are advised to postpone donation for 14–28 days. Separately, Nacker et al. concluded that in previous reports SARS and Middle East respiratory syndrome-corona virus (MERS-CoV) infections, indicate that AKI developed in 5% to 15% cases and carried a high (60–90%) mortality rate. Early reports suggest a lower incidence (3–9%) of AKI in those with 2019-nCoV infection [30]. The pathophysiological bases related to kidney involvement are still unclear. Hypothesized mechanisms include sepsis leading to cytokine storm syndrome or direct cellular injury due to the virus. Angiotensin-converting enzyme and dipeptidyl peptidase-4, both expressed on renal tubular cells, were identified as binding partners for SARS-CoV and MERS-CoV, respectively. Viral RNA has been identified in kidney tissue and urine in both infections. Recently SARS-CoV-2 has also been isolated from the urine samples of an infected patient, suggesting the kidney as target of this novel coronavirus [30].
Chemokine network and 2019-nCoV
Inflammation in viral pneumonia can be a double-edged sword. Although inflammation is important for local tissues to combat infection, increased inflammatory responses in pneumonia patients result in the excessive release of pro-inflammatory cytokines known as a “cytokine storm”, leading to detrimental outcomes, such as diffuse alveolar damage, fibrosis, progressive respiratory failure and multiple organ dysfunction [31]. 2019-nCoV patients show a dramatic cytokine storm, which is in reminiscent of previous SARS-CoV infections [32]. A higher number of clinical studies have suggested that a cytokine storm is associated with 2019-nCoV severity and is also a crucial cause of death from 2019-nCoV [33]. It has been reported that nearly 14% of infected patients develop severe disease requiring hospitalization and oxygen support and that 5% require admission to an intensive care unit [34]. 2019-nCoV mild patients demonstrate a high level of IL1-β, IFN-γ, CXCL10/IP-10 and CCL2/MCP-1, whilst patients requiring Intensive Care Unit admission have higher levels of G-CSF, CXCL10/IP-10, CCL2/MCP-1 and CCL3/MIP-1ɑ. A specific inflammatory cytokine and chemokine expression profile have been identified in 2019nCoV patients. Additionally, autopsy lung tissue has shown diffuse infiltration of hyperactivated T-lymphocytes [34, 35]. In a study by Xiong et al. [36] an expression of a large number of cytokines was found to be significantly elevated in 2019-nCoV patients’ bronchoalveolar lavage fluid samples compared to control, including pro-inflammatory cytokines CXCL1, CXCL2, CXCL6, CXCL8, CXCL10/IP-10, CCL2/MCP-1, CCL3/MIP-1A and CCL4/MIP1B. These data suggest that SARS-CoV-2 virus infection led to cytokine storm, which correlated with disease severity. Recently, La Rosée et al. reported that using a newly developed 2019-nCoV Inflammation Score (CIS), patients were prospectively stratified for targeted inhibition of cytokine signaling by ruxolitinib, a drug approved as a potent and selective inhibitor of Janus kinase 1 and 2 for the treatment of primary myelofibrosis, post polycythemia vera or post-essential trombocytemia myelofibrosis, all highly inflammatory conditions. Patients were treated with efficacy/toxicity guided step-up dosing up to 14 days. Out of 105 patients treated between March 30th and April 15th, 2020, 14 patients with a CIS ≥ 10 out of 16 points received ruxolitinib over a median of 9 days with a median cumulative dose of 135 mg. A total of 12 out of 14 patients achieved significant reduction of CIS by ≥ 25% on day 7 with sustained clinical improvement in 11 out of 14 patients without short term red flag warnings of Ruxinduced toxicity [34]. Ruxolitinib treatment in affected patients with hyperinflammation has been found to be safe with signals of efficacy for cytokine release syndrome-intervention to prevent or overcome multiorgan failure. Concomitantly, the same Authors have initiated a multicenter phase-II clinical trial (NCT04338958). Importantly, the study by La Rosée et al. [34] was aimed at diminishing or stopping the detrimental cytokine signaling, therefore, preventing further organ damages. Increased transcription of the respective chemokines receptors such as CCR2 (CCL2/MCP-1 receptor) and CCR5 (CCL3/MIP-1ɑ receptor) was also observed, indicating the activation of these inflammatory signals. Chemokines and their conventional and atypical receptors play an important role in the leukocyte migration and activation of immune cells at the sites of infection [37, 38]. It has been shown that CCR2 and CCR5 deficient mice infected with mouse-adapted SARS-CoV virus exhibited defects in directing inflammatory cells to the airway, causing severe disease and increased mortality [39]. In addition, high levels of macrophages chemoattractants CXCL10/IP-10 and CCL2/MCP-1 and neutrophil chemoattractants CXCL2 and CXCL8 facilitate the migration of these immune cells to the site of infection, which was consistent with mononuclear cell infiltrates in lung tissues of 2019-nCoV patients [35].
Chemokines network, 2019-nCoV and kidney diseases
AKI defines a systemic disease characterized by acute loss of renal function and the storage of end products of nitrogen metabolism. Ischemic AKI is the most common cause of AKI, and inflammatory responses are inevitably involved in ischemic AKI. In the process of ischemic AKI, various factors (among them the so-called chemokines) are responsible for promoting and recruiting immune cells to the injured kidney [40].
The RUBY study was a multi-center international prospective observational study, aimed at identifying the biomarkers of persistent stage 3 AKI as defined by the KDIGO criteria [41]. In this large international cohort of surgical and medical intensive care patients, it has been shown that several candidate molecules predicted the persistence of AKI. However the most promising was a previously unknown candidate called urinary chemokine C–C motif ligand 14 (CCL14). Among patients who did not persist at any stage of AKI, the urinary CCL14 concentrations within different comorbid conditions were similar suggest that urinary CCL14 elevations were specific to AKI persistence. Given this performance, CCL14 could be an important mediator of renal tissue damage and non-recovery, providing potential novel diagnostic and prognostic information that is important for the management of patients with AKI, including decisions related to initiation of renal replacement therapy. Additionally, CCL14 has been shown to be an inflammatory marker, which identifies the risk of developing the end-stage renal disease in diabetics [42]. CCL14 is a member of the chemokine family that has been recognized its crucial roles in monocyte/macrophage recruitment and the tissue injury and repair processes. It is associated in a variety of diseases including rheumatoid arthritis, multiple sclerosis, and lupus [43, 44]. CCL14 binds to the conventional CC chemokine receptors 1, 5 and 3 (CCR1, CCR5 and CCR3) [45], as well as to the atypical chemokine receptor ACKR2 [46]. Today, little is known regarding the role of CCL14 in AKI, mainly because CCL14 it cannot be studied in pre-clinical models. As macrophage recruitment and polarization are accepted as important players in kidney tissue damage and the development of persistent kidney dysfunction [47], a putative role for CCL14 can be hypothesized. Briefly, in a pro-inflammatory environment, TNF-α and other inflammatory mediators are released from injured epithelium and bind to TNF receptors, leading to release of CCL14 from tubular epithelial cells. The binding of CCL14 to CCR1 and CCR5 receptors on monocytes and T-lymphocytes induces chemotaxis towards the site of injury, where monocytes differentiate into macrophages and naïve T-lymphocytes differentiate into pro-inflammatory T-lymphocytes helper 1 (Th1) that are pathogenic and can extend and magnify tissue damage.
C–C motif ligand 1 (CCL2 also known as Monocyte Chemotactic Protein-1 MCP1) is a member of the chemokine family. CCL2 binds to conventional CC chemokine receptor 2 (CCR2) on monocytes and regulates the trafficking of monocytes from bone marrow to tissues in response to inflammatory signals. Interestingly, similar to CCL14, fine tuning of the bioavailability of CCL2 relies on its binding to the atypical chemokine receptor ACKR2 [46], confirming the crucial role of this chemokine receptor and its pro-inflammatory ligands in AKI. It has been shown that mRNA expression is increased in ischemia–reperfusion injury, and thus, it has value as a biomarker for mononuclear inflammatory processes that occur after ischemic AKI [48]. In further studies, CCL2 was found to be a potent chemokine produced by kidney cells, acting as a mediator in acute ischemic and toxic kidney injuries. The potential utility of CCL2 as a biomarker was also supported by clinical assessments observing increases in urinary CCL2 protein in patients with AKI. It has been shown that CCL2 increases to a greater extent than Neutrophil Gelatinase-Associated Lipocalin (NGAL) in intrarenal injury, although NGAL and CCL2 gene expression increase comparably in renal injury. The NGAL gene is induced by uremia per se in the absence of renal injury, while the CCL2 gene not. Thus, it could provide complementary information to that provided by NGAL [49]. Finally, elevated plasma CCL2 has been associated with an increased risk of AKI and death after cardiac operations [50].
In a model of dextran sodium sulfate colitis, chemokine C-X-C motif ligand 1 (CXCL1) has been shown to be the major mediator of colon-kidney organ crosstalk [51]. Chemokine C-X-C motif ligand 8 (CXCL8, also known as IL-8), the human homolog of rodent CXCL1, is an early pro-inflammatory chemokine secreted by mononuclear immune cells and epithelial cells to trigger neutrophil chemotaxis and activation by binding and activating conventional CXC chemokine receptors 1 and 2 (CXCR1 and CXCR2) [52]. CXCL8/CXCL1 has been implicated in a broad range of diseases characterized by polymorphonuclear neutrophils cell infiltration, including AKI [53]. If the initial role of the CXCL8 pathway is involved in the local innate immune response after activation of the NF-κB pathway, persistent or up-regulated expression of CXCL8 could preserve immune cell recruitment, with deleterious effects on inflamed tissue. In a recent study of Amrouche et al. it has been found that miR-146a targets the NF-κB pathway in tubular cells and consequently, regulate CXCL8 secretion. Deletion of miR-146a in vivo enhanced the formation of tubular lesions after unilateral AKI, the infiltration of immune cells, and the development of renal fibrosis [54].
The expression of C-X3-C motif ligand 1 (CX3CL1, also known as fractalkine) induced by Lipopolysaccharides (LPS) is also one of the pivotal inflammatory elements linked to renal tissue damage. CX3CL1 participates in the inflammatory response in several biological systems by binding to its receptor CX3CR1. Most studies demonstrated its role in promoting renal pathopoiesis (glomerular inflammation and endothelial injury); however, several recent studies showed that it could also reduce renal pathopoiesis. Thus, to date the CX3CL1/CX3CR1 axis is considered to be a double-edged sword that could provide novel perspectives into the pathogenesis and treatment of renal diseases and disorders [55]. Furthermore, Park et al. found that LPS can up-regulate the expression of CXC3CL1 and can contribute to renal inflammation leading to chronic renal allograft rejection. A recent study revealed that LPS can cause inflammatory responses both in vitro and in vivo of glomerular podocytes by means of enhancing CX3CL1 and activating the Wnt/β-catenin signaling pathway in podocytes, resulting in a decrease in the expression of podocyte-specific mRNA and proteins and is involved in the occurrence and development of AKI [56].
The bioavailability of chemokines represents a crucial hub in AKI. The crucial role exerted by pro-inflammatory chemokines such as CCL14 and CCL2 suggest a key contribution of ACKR2 in AKI pathogenesis. The atypical chemokine receptor ACKR2 represents a scavenger receptor, which binds and sequesters many inflammatory CC chemokines but does not transduce typical G-protein mediated signaling events [57]. Human biopsies stained with antibodies raised against-ACKR2 revealed increased staining in the diabetic kidney, especially in some tubules, interstitial cells, leukocytes, and endothelial cells [58]. Accordingly, the established ACKR2 knockout mouse exhibits several features of human diabetic nephropathy and extensive renal inflammation [58]. A recent report also showed that ACKR2 limits leukocyte infiltration (mainly monocytes, T-lymphocytes, and Ly6Chi inflammatory macrophages), inflammation, and fibrotic tissue remodeling after AKI, thus preventing progression to chronic kidney disease [59]. Furthermore, it has been demonstrated that ACKR2 plays an important role in limiting glomerular and tubulointerstitial injury, inflammation, and fibrotic remodeling due to scavenging of chemokines in the tubulointerstitial compartment [60]. Collectively, these data identify ACKR2 as a potential target for therapeutic approaches in renal inflammatory and fibrotic disease associated with AKI.
Conclusions
It has been ascertained that antiviral drugs administered shortly after symptom onset can reduce infectiousness by reducing viral shedding in the respiratory secretions of patients, and targeted prophylactic treatment of contacts could reduce their risk of becoming infected [61]. Yang et al. entitled their manuscript “Diagnosis and treatment of 2019-nCoV: acute kidney injury cannot be ignored”, a peer-reviewed article [62]. As suggested by Zhang and Liang [63] particular attention to renal function should be taken into account when treating 2019-nCoV patients [64]. Such information calls for patient care regarding the renal function of patients currently under emergency and potential post-cure treatment for kidney recovery. Furthermore, several authors have published regarding patients affected by diabetes [65,66,67,68,69,70,71,72], and those undergoing kidney transplant [73,74,75,76]. In particular, Muniyappa et al. [71] discussed potential mechanisms by which diabetes modulates host-viral interactions and host-immune responses. They found that although studies exist in humanized ACE2 mice and non-human primates aimed at understanding how hyperglycemia, hyperinsulinemia, and hypoglycemic agents affect the pathogenesis of 2019-nCoV, studies regarding how diabetes mellitus affects the efficacy of vaccines and anti-viral investigational agents currently in trials are warranted. Furthermore, Naspro and Del Pozzo stated: “In particular, urologists manage many patients with oncological diseases and surgical priorities, and also many non-oncological life-threatening conditions and other disorders that only affect the quality of life.” [77]. Furthermore, the actual knowledge suggests a particular attention to subjects with a unique kidney as more prone to kidney failure [78].
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Taverna, G., Di Francesco, S., Borroni, E.M. et al. The kidney, COVID-19, and the chemokine network: an intriguing trio. Int Urol Nephrol 53, 97–104 (2021). https://doi.org/10.1007/s11255-020-02579-8
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DOI: https://doi.org/10.1007/s11255-020-02579-8