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Fisher M, Ross M, DiFranza L, Reidy K. An Update on Viral Infection-Associated Collapsing Glomerulopathy. ADVANCES IN KIDNEY DISEASE AND HEALTH 2024; 31:317-325. [PMID: 39084757 PMCID: PMC11296492 DOI: 10.1053/j.akdh.2023.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 11/14/2023] [Accepted: 12/14/2023] [Indexed: 08/02/2024]
Abstract
The COVID-19 era has been a reminder to clinicians around the world of the important role that viral infections play in promoting glomerular disease. Several viral infections including human immunodeficiency virus (HIV), severe acute respiratory syndrome coronavirus 2, Epstein-Barr virus, cytomegalovirus, and parvovirus B19 can cause podocyte injury and present with a collapsing glomerulopathy (CG) variant of focal segmental glomerulosclerosis or minimal change disease. CG associated with COVID-19 has been termed COVID-19-associated nephropathy due to its striking resemblance to HIV-associated nephropathy. Host susceptibility is a major determinant of viral infection-associated CG, and the presence of two APOL1 risk variants explains most of the racial predilection to viral-associated CG observed in individuals of African ancestry. Interactions between APOL1 risk variants, viral genes, and the systemic inflammatory response to viral infection all contribute to kidney injury. This review will summarize our current knowledge of viral infection-associated CG, focusing primarily on the clinical presentation, histological features, mechanisms, and disease course of HIV-associated nephropathy and COVID-19-associated nephropathy.
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Affiliation(s)
- Molly Fisher
- Division of Nephrology, Albert Einstein College of Medicine, Montefiore Health System, Bronx, NY.
| | - Michael Ross
- Division of Nephrology, Albert Einstein College of Medicine, Montefiore Health System, Bronx, NY; Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY
| | - Lanny DiFranza
- Department of Pathology, Albert Einstein College of Medicine, Montefiore Health System, Bronx, NY
| | - Kimberly Reidy
- Division of Pediatric Nephrology, The Children's Hospital at Montefiore/Albert Einstein College of Medicine, Bronx, NY
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2
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El-Halaby H, Eid R, Elagamy A, El-Hussiny A, Moustafa F, Hammad A, Zeid M. A retrospective analysis of acute kidney injury in children with post-COVID-19 multisystem inflammatory syndrome: insights into promising outcomes. Ital J Pediatr 2024; 50:23. [PMID: 38317228 PMCID: PMC10845792 DOI: 10.1186/s13052-024-01598-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 01/21/2024] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Acute kidney injury (AKI) in patients with multisystem inflammatory syndrome (MIS), COVID-19 related infection has been increasingly recognized with a paucity of data on AKI incidence, related mortality, and the requirement of renal replacement therapy in children with MIS (MIS-C). METHODS This is a retrospective study evaluating the prevalence, severity, management and outcomes of AKI in a cohort of Egyptian children with MIS-children (MIS-C) post-COVID infection. Patients were included if they met the criteria for MIS-C based on CDC guidelines. All patients were evaluated for AKI diagnosis and staging according to the Kidney Disease Improving Global Outcomes (KDIGO) criteria. RESULTS Between March 2021 and June 2023, a total of 655 confirmed COVID-19 cases were admitted and then followed up in our hospital, of whom 138 (21%) were diagnosed with MIS-C. Fifty-one patients developed AKI associated with MIS-C post-COVID infection, 42 of whom were included in the analysis. Thirty-one patients had AKI in a formerly healthy kidney, of whom 51% (16 patients) were classified as KDIGO stage 3, 5 patients needed hemodialysis and 13 needed mechanical ventilation. Higher WBCs count, and serum ferritin on admission were associated with more severe AKI (KDIGO stage 3) (p = 0.04), while multivariate analysis showed high serum ferritin to be independent predictor of more severe AKI (p = 0.02). Two patients (2/31) died during hospital admission, while no residual renal impairment was reported at the time of discharge of patients with previously normal kidney functions. CONCLUSION More than one-third of patients with MIS-C develop AKI. Avoidance of nephrotoxic drugs, early recognition, and prompt management of AKI, including well-timed commencement of dialysis in MIS-C cases, is associated with favorable outcomes.
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Affiliation(s)
- Hanan El-Halaby
- Pediatric Critical Care Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Riham Eid
- Pediatric Nephrology Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
| | - Ahmed Elagamy
- Pediatric Critical Care Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ahmed El-Hussiny
- Pediatric Critical Care Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Fatma Moustafa
- Department of Pathology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ayman Hammad
- Pediatric Nephrology Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Mayada Zeid
- Pediatric Infectious Diseases Unit, Mansoura University Children's Hospital, Faculty of Medicine, Mansoura University, Mansoura, Egypt
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3
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Volbeda M, Jou-Valencia D, van den Heuvel MC, Zijlstra JG, Franssen CFM, van der Voort PHJ, Moser J, van Meurs M. Acute and chronic histopathological findings in renal biopsies in COVID-19. Clin Exp Med 2023; 23:1003-1014. [PMID: 36396750 PMCID: PMC9672628 DOI: 10.1007/s10238-022-00941-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 11/03/2022] [Indexed: 11/19/2022]
Abstract
The dominant ICU admission diagnosis of COVID-19 patients is respiratory insufficiency, but 32-57% of hospitalized COVID-19 patients develop acute kidney injury (COVID-AKI). The renal histopathological changes accompanying COVID-AKI are not yet fully described. To obtain a detailed insight into renal histopathological features of COVID-19, we conducted a review including all studies reporting histopathological findings of diagnostic and postmortem kidney biopsies from patients with COVID-19 published between January 1, 2020, and January 31, 2021. A total of 89 diagnostic and 194 postmortem renal biopsies from individual patients in 39 published studies were investigated and were included in the analysis. In the diagnostic biopsy group, mean age was 56 years and AKI incidence was 96%. In the postmortem biopsy group, mean age was 69 years and AKI incidence was 80%. In the diagnostic biopsy group, the prevalence of acute glomerular diseases was 74%. The most common glomerular lesions were collapsing focal segmental glomerulosclerosis (c-FSGS) in 54% and thrombotic microangiopathy (TMA) in 9% of patients. TMA was also found in 10% of patients in the postmortem biopsy group. The most common acute tubular lesions was acute tubular necrosis (ATN) which was present in 87% of patients in the diagnostic and in 77% of patients in the postmortem biopsy group. Additionally, we observed a high prevalence of preexisting chronic lesions in both groups such as atherosclerosis and glomerulosclerosis. Histopathological changes in renal biopsies of COVID-19 patients show a heterogeneous picture with acute glomerular lesions, predominantly c-FSGS and TMA, and acute tubular lesions, predominantly ATN. In many patients, these lesions were present on a background of chronic renal injury.
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Affiliation(s)
- Meint Volbeda
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands.
| | - Daniela Jou-Valencia
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
| | - Marius C van den Heuvel
- Department of Pathology and Medical Biology, Pathology Section, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Jan G Zijlstra
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
| | - Casper F M Franssen
- Department of Nephrology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Peter H J van der Voort
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
| | - Jill Moser
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
- Department of Pathology and Medical Biology, Medical Biology Section, Laboratory for Endothelial Biomedicine and Vascular Drug Targeting Research, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Matijs van Meurs
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
- Department of Pathology and Medical Biology, Medical Biology Section, Laboratory for Endothelial Biomedicine and Vascular Drug Targeting Research, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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4
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Medina E, Rueda C, Batlle D. FSGS and COVID-19 in Non-African American Patients. KIDNEY360 2023; 4:687-699. [PMID: 37229730 PMCID: PMC10371264 DOI: 10.34067/kid.0000000000000104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 02/10/2023] [Indexed: 05/27/2023]
Abstract
Collapsing Focal Segmental Glomerulosclerosis (FSGS) has been reported relatively frequently in African American (AA) patients with coronavirus disease 2019 (COVID-19), and it is associated almost always with Apolipoprotein L gen 1 (APOL1) high-risk variants. We reviewed the published literature from April 2020 to November 2022 searching for non-African American (non-AA) patients with FSGS associated with COVID-19 (eight White patients, six Hispanic patients, three Asian patients, one Indian patient, and one Asian Indian patient). The following histologic patterns were found: collapsing (n=11), not otherwise specified (n=5), tip (n=2), and perihilar (n=1). Fifteen of the 19 patients had AKI. The APOL1 genotype was reported in only six of the 19 non-AA patients. Three of them (two Hispanic patients and one White patient) with collapsing FSGS had high-risk APOL1 variants. The other three patients (two White patients and one Hispanic patient with the collapsing variant, tip variant, and not otherwise specified) had low-risk APOL1 variants. Among 53 African American patients with collapsing FSGS associated with COVID-19, 48 had high-risk APOL1 variants and five had low-risk APOL1 variants. We conclude that in non-AA patients, FSGS is a rare complication of COVID-19. FSGS associated with COVID-19 can occur rarely with low-risk APOL1 variants in non-AA and AA patients. Non-AA patients reported to be associated with high-risk APOL1 variants possibly reflect inaccuracy of self-reported race with AA admixture because of unknown ancestry. Given the importance of APOL1 in the pathogenesis of FSGS associated with viral infection and to avoid racial bias, it seems appropriate that APOL1 testing be considered in patients with FSGS associated with COVID-19, regardless of self-reported race.
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Affiliation(s)
- Elba Medina
- Division of Nephrology, General Hospital of México, Eduardo Liceaga, México City, México
- Master's and PhD Program in Dental and Health Medical Sciences, Universidad Nacional Autónoma de México, México City, México
| | - Carlos Rueda
- Division of Nephrology/Hypertension, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Daniel Batlle
- Division of Nephrology/Hypertension, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
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5
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Abstract
COVID (Coronavirus disease)-19 is a systemic disease and the kidney is one of the target organs of infection. Kidney injury is common and can occur in up to 40% of patients. Several glomerular diseases have been reported in association with COVID-19. Some are likely related to COVID-19 whereas many are likely coincidental. Glomerular diseases that are frequently reported in COVID-19 and have a plausible mechanistic explanation, are likely to be related to COVID-19. On the other hand, glomerular diseases that are seldom reported and have no known plausible mechanism, are likely to be unrelated. Collapsing glomerulopathy (CG) is by far the most prevalent. Its association with COVID-19, resembling human immunodeficiency virus (HIV) and CG, led to the newly proposed term “COVID-19 associated nephropathy” or “COVAN”. High-risk APOL1 genotypes are the major risk factor in COVAN patients. Podocytopathy, membranous nephropathy, pauci-immune crescentic glomerulonephritis, and thrombotic microangiopathy are also reported. In kidney allografts, CG remains the most common glomerular pathology. Patients typically present with acute kidney injury (AKI) or abnormal urinary findings at the time of or shortly after COVID-19 diagnosis. Treatment of glomerular disease in COVID-19 patients is challenging. Providers should cautiously consider balancing risks and benefit of immunosuppression, particularly in patients with active diseases. Short-term outcomes vary but generally remain poor with high morbidity and mortality. Future study of long-term outcomes is needed to improve our understanding of glomerular disease associated with COVID-19.
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6
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Kumar SVRB, Elango I, Balasubramanian K, Nair SV, Ramasamy A, Kathir C. Renal Allograft Cortical Necrosis in a COVID-19 Positive Patient. Indian J Nephrol 2023; 33:125-127. [PMID: 37234436 PMCID: PMC10208533 DOI: 10.4103/ijn.ijn_3_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 03/15/2022] [Indexed: 11/04/2022] Open
Abstract
The incidence of acute kidney injury (AKI) has been reported to be higher in kidney transplant recipients infected with SARS-CoV-2 compared with the general population. Here, we report a case of cortical necrosis in the graft kidney due to COVID infection in a patient with stable graft function over the years. The patient was started on hemodialysis and treated with steroids, and anticoagulants for COVID infection. Later, he had gradual improvement in his graft function and became dialysis independent on follow up.
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Affiliation(s)
- SVR Bipin Kumar
- Department of Nephrology, Saveetha Medical College Hospital, Tamil Nadu, India
| | - Indumathi Elango
- Department of Nephrology, Saveetha Medical College Hospital, Tamil Nadu, India
| | | | - Sanjeev V. Nair
- Department of Nephrology, Saveetha Medical College Hospital, Tamil Nadu, India
| | - Ashok Ramasamy
- Department of Nephrology, Saveetha Medical College Hospital, Tamil Nadu, India
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7
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Shabaka A, Rovirosa-Bigot S, Márquez CG, Alonso Riaño M, Fernández-Juárez G. Acute kidney failure and nephrotic syndrome secondary to COVID-19-associated focal segmental glomerulosclerosis. Nefrologia 2023; 42:727-729. [PMID: 36841681 PMCID: PMC9941307 DOI: 10.1016/j.nefroe.2020.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 10/29/2020] [Indexed: 02/23/2023] Open
Affiliation(s)
- Amir Shabaka
- Servicio de Nefrología, Hospital Universitario Fundación Alcorcón, Madrid, Spain.
| | - Sofía Rovirosa-Bigot
- Servicio de Medicina Intensiva, Hospital Universitario Fundación Alcorcón, Madrid, Spain
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8
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Qamar MA, Kogut LM, Tebha SS, Arif A, Ninmol J, Abdul Razzaque MR, Qamar K, Yosufi A. Collapsing focal segmental glomerulosclerosis secondary to COVID-19: A systematic review and meta-analysis. Ann Med Surg (Lond) 2023; 85:92-101. [PMID: 36845824 PMCID: PMC9949810 DOI: 10.1097/ms9.0000000000000107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 12/22/2022] [Indexed: 02/28/2023] Open
Abstract
The renal system manifestations of coronavirus disease-2019 have been documented extensively; however, scientific literature remains scarce regarding collapsing glomerulopathy hence the need for this investigation. Methods A comprehensive review was conducted covering a timeline from 1 January 2020 to 5 February 2022 without any restrictions. The data extraction was conducted independently, and articles were assessed for the risk of bias. Data analysis was conducted using Comprehensive Meta-Analysis version 3.3.070 and RevMan version 5.4 for pooled proportions and risk ratio (RR) between dialysis-dependent and independent treatment groups with a P-value less than 0.05 considered significant. Results A total of 38 studies were included in this review, including 74 (65.9%) males. The mean age was 54.2 years old. The most common symptoms reported were related to the respiratory system (59.6%, 95% CI: 50.4-68.2%) and hematuria (34.2%, 95% CI: 26.1-43.4). Antibiotics (25.9%, 95% CI: 12.9-45.3%) was the commonest management used. Proteinuria was the most reported laboratory finding at 89.5% (95% CI: 82.4-93.9%), while the commonest microscopic finding was acute tubular injury (77.2%, 95% CI: 68.6-84.0%). An increased risk of the presence of symptoms (P=0.005) and microscopic findings (P=0.0003) related to collapsing glomerulopathy in dialysis-dependent group was noted with increased management (P=0.01) used in this group for coronavirus disease-2019 infection. Conclusion The findings of this study portray the prognostic value of the variables (symptoms and microscopic findings, etc.) reported in the analysis. Hence this study serves as a foundation for future investigations that minimize the study's limitations to provide a more robust conclusion.
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Affiliation(s)
| | - Lucas M. Kogut
- Department of Nephrology, Hope Medical Institute, Newport News, Virginia, USA
| | - Sameer S. Tebha
- Department of Neurosurgery and Neurology, Jinnah Medical and Dental College
| | | | - Jesse Ninmol
- Department of Public Health, University of California, Berkeley, California
| | - Muhammad R. Abdul Razzaque
- Department of Medicine, Section of Nephrology, Jinnah Medical and Dental College, Karachi, Sindh, Pakistan
| | | | - Abubakr Yosufi
- Medical School, Kabul University of Medical Sciences, Kabul, Afghanistan
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9
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Muacevic A, Adler JR, Demarchi Foresto R, Machado Proença H, Medina-Pestana J. Two-Hit Kidney Allograft Injury by SARS-CoV-2. Cureus 2023; 15:e34603. [PMID: 36751573 PMCID: PMC9897707 DOI: 10.7759/cureus.34603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2023] [Indexed: 02/05/2023] Open
Abstract
Coronavirus disease 2019 (COVID-19) has been associated with acute kidney injury in kidney transplant recipients by several mechanisms. The authors report a case of acute kidney allograft dysfunction in a 48-year-old patient who presented in the emergency room with anasarca and nephrotic syndrome close after mild COVID-19 and no other clinical condition. Histopathology of the allograft biopsy revealed two distinct and simultaneous kidney lesions, collapsing glomerulopathy and thrombotic microangiopathy. Renal function persistently deteriorated, and definitive dialysis was initiated. After excluding other plausible causes for the findings, this case strengthens the hypothesis that the kidney allograft is also a target of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
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10
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Rao N, Pooniya V, Chandra A, Malhotra K, Srivastava A. Coexistent De novo membranous and collapsing glomerulopathies in the allograft: Unusual alloimmune injury. INDIAN JOURNAL OF TRANSPLANTATION 2023. [DOI: 10.4103/ijot.ijot_40_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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11
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Double glomerulopathies or two-faced janus? A challenging case in the COVID-19 era. J Nephrol 2023; 36:225-228. [PMID: 35666373 PMCID: PMC9169020 DOI: 10.1007/s40620-022-01351-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 05/10/2022] [Indexed: 02/07/2023]
Abstract
SARS-CoV-2 very often causes kidney involvement through various mechanisms including: acute tubular injury, virus cell invasion, vascular damage due to hypercoagulability and finally dysregulation of the immune system. Even though there are no pathognomonic morphologic features that can rule out or confirm direct damage by SARS-CoV-2, the latest literature suggests that there may be some association. SARS-CoV-2 infection represents a poor prognostic factor, regardless of pulmonary involvement. We report a challenging case with complex renal biopsy findings suggestive of collapsing glomerulopathy and focal proliferative IgA-dominant glomerulonephritis in a patient affected by active hepatitis C virus (HCV), SARS-CoV-2 infection and personal history of cocaine abuse.
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12
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COVID-19 and Kidney Transplantation: Epidemiology, Histopathological Presentation, Clinical Presentation and Outcomes, and Therapeutic Strategies. TRANSPLANTOLOGY 2022. [DOI: 10.3390/transplantology3030023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Multiple case series of kidney transplant recipients with COVID-19 have shown increased mortality compared to nontransplant patients. To date, we do not have high-level evidence to inform immunosuppression minimization strategies in infected transplant recipients. Most centers, however, have adopted an early antimetabolite withdrawal in addition to other interventions. The epidemiological problem concerns also dialysis patients and waitlisted patients who have a higher COVID-19 infection diffusion with respect to kidney transplant recipients. Several factors influence mortality among kidney transplant recipients. Among these factors are the age, race, and comorbidity factors, such as hypertension, diabetes mellitus, obesity, and previous respiratory problems. Treatment is still limited. The only effective antiviral drug is remdesivir that should be administered before the development of the cytokine storm. Vaccination seems to be useful, but due to the concomitant immunosuppression limiting its efficacy, at least three or four doses should be administered.
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13
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Ning Q, Wu D, Wang X, Xi D, Chen T, Chen G, Wang H, Lu H, Wang M, Zhu L, Hu J, Liu T, Ma K, Han M, Luo X. The mechanism underlying extrapulmonary complications of the coronavirus disease 2019 and its therapeutic implication. Signal Transduct Target Ther 2022; 7:57. [PMID: 35197452 PMCID: PMC8863906 DOI: 10.1038/s41392-022-00907-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 01/10/2022] [Accepted: 01/17/2022] [Indexed: 02/06/2023] Open
Abstract
The coronavirus disease 2019 (COVID-19) is a highly transmissible disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that poses a major threat to global public health. Although COVID-19 primarily affects the respiratory system, causing severe pneumonia and acute respiratory distress syndrome in severe cases, it can also result in multiple extrapulmonary complications. The pathogenesis of extrapulmonary damage in patients with COVID-19 is probably multifactorial, involving both the direct effects of SARS-CoV-2 and the indirect mechanisms associated with the host inflammatory response. Recognition of features and pathogenesis of extrapulmonary complications has clinical implications for identifying disease progression and designing therapeutic strategies. This review provides an overview of the extrapulmonary complications of COVID-19 from immunological and pathophysiologic perspectives and focuses on the pathogenesis and potential therapeutic targets for the management of COVID-19.
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Affiliation(s)
- Qin Ning
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Di Wu
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaojing Wang
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Dong Xi
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Tao Chen
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Guang Chen
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hongwu Wang
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Huiling Lu
- National Medical Center for Major Public Health Events, Department of Pediatrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ming Wang
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lin Zhu
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Junjian Hu
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Tingting Liu
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ke Ma
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Meifang Han
- National Medical Center for Major Public Health Events, Department and Institute of Infectious Disease, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Xiaoping Luo
- National Medical Center for Major Public Health Events, Department of Pediatrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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14
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Alawad MJ, Subahi EA, Al-Ani HA, Taha NM, Kamal I. A case of crescentic glomerulonephritis in a patient with COVID-19 infection: A case report and literature review. Medicine (Baltimore) 2022; 101:e28754. [PMID: 35363164 PMCID: PMC9282030 DOI: 10.1097/md.0000000000028754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/17/2022] [Indexed: 01/04/2023] Open
Abstract
RATIONALE Kidney involvement with COVID-19 infection is a well-known complication, and the majority of kidney involvement is related to ischemic injury/acute tubular injury. However, there are some cases of glomerulonephritis, the etiology of which is not yet known, but an immune process is likely to be the trigger. PATIENT CONCERNS A 27-year-old man presented to our hospital with facial puffiness and lower-limb swelling. DIAGNOSIS Laboratory assessment revealed features of impaired kidney function with proteinuria and hematuria; COVID-19 polymerase chain reaction was positive, which was consistent with pauci-immune crescentic focal segmental glomerulonephritis. INTERVENTION After renal biopsy, the patient was started on methylprednisolone and rituximab. Due to worsening kidney parameters, he underwent intermittent hemodialysis as needed. OUTCOME Kidney function tests partially improved; he was discharged on oral steroids with follow-up in the nephrology clinic to observe for the need for further hemodialysis. LESSONS We conducted a literature review of cases of glomerulonephritis associated with COVID-19 and described numerous types of glomerulonephritis. This report highlights the importance of recognizing emerging glomerulonephritis with COVID-19, the different pathological patterns of renal biopsies, and management interventions and responses.
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Affiliation(s)
- Mouhammad J. Alawad
- Department of Medical Education, Internal Medicine Residency Program, Hamad Medical Corporation, Doha, Qatar
| | - Eihab A. Subahi
- Department of Medical Education, Internal Medicine Residency Program, Hamad Medical Corporation, Doha, Qatar
| | - Haneen A. Al-Ani
- Department of Medical Education, Internal Medicine Residency Program, Hamad Medical Corporation, Doha, Qatar
| | - Noheir M. Taha
- Department of Laboratory Medicine and Pathology, Hamad Medical Corporation, Doha, Qatar
| | - Ijaz Kamal
- Department of Internal Medicine, Hamad Medical Corporation, Doha, Qatar
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15
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Gambella A, Barreca A, Biancone L, Roccatello D, Peruzzi L, Besso L, Licata C, Attanasio A, Papotti M, Cassoni P. Spectrum of Kidney Injury Following COVID-19 Disease: Renal Biopsy Findings in a Single Italian Pathology Service. Biomolecules 2022; 12:298. [PMID: 35204798 PMCID: PMC8961620 DOI: 10.3390/biom12020298] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 02/04/2023] Open
Abstract
The onset of coronavirus disease (COVID-19) as a pandemic infection, has led to increasing insights on its pathophysiology and clinical features being revealed, such as a noticeable kidney involvement. In this study, we describe the histopathological, immunofluorescence, and ultrastructural features of biopsy-proven kidney injury observed in a series of SARS-CoV-2 positive cases in our institution from April 2020 to November 2021. We retrieved and retrospectively reviewed nine cases (two pediatric and seven adults) that experienced nephrotic syndrome (six cases), acute kidney injury (two cases), and a clinically silent microhematuria and leukocyturia. Kidney biopsies were investigated by means of light microscopy, direct immunofluorescence, and electron microscopy. The primary diagnoses were minimal change disease (four cases), acute tubular necrosis (two cases), collapsing glomerulopathy (two cases), and C3 glomerulopathy (one case). None of the cases showed viral or viral-like particles on ultrastructural analysis. Novel and specific histologic features on kidney biopsy related to SARS-CoV-2 infection have been gradually disclosed and reported, harboring relevant clinical and therapeutic implications. Recognizing and properly diagnosing renal involvement in patients experiencing COVID-19 could be challenging (due to the lack of direct proof of viral infection, e.g., viral particles) and requires a proper integration of clinical and pathological data.
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Affiliation(s)
- Alessandro Gambella
- Pathology Unit, Department of Medical Sciences, University of Turin, Via Santena 7, 10126 Turin, Italy; (A.G.); (A.A.)
| | - Antonella Barreca
- Pathology Unit, “Città della Salute e della Scienza di Torino” University Hospital, Via Santena 7, 10126 Turin, Italy;
| | - Luigi Biancone
- Division of Nephrology Dialysis and Transplantation, AOU Città della Salute e della Scienza di Torino, Department of Medical Sciences, University of Turin, 10126 Turin, Italy;
| | - Dario Roccatello
- CMID, Coordinating Center of the Network for Rare Diseases of Piedmont and Aosta Valley, Nephrology and Dialysis Unit (ERK-Net Member), San Giovanni Bosco Hub Hospital, University of Turin, 10144 Turin, Italy;
| | - Licia Peruzzi
- Pediatric Nephrology Unit, Regina Margherita Department, AOU Città della Salute e della Scienza di Torino, 10126 Turin, Italy;
| | - Luca Besso
- Division of Nephrology and Dialysis, AO S. Croce e Carle di Cuneo, 12100 Cuneo, Italy;
| | - Carolina Licata
- Division of Nephrology and Dialysis, ASL TO4, 10073 Ciriè, Italy;
| | - Angelo Attanasio
- Pathology Unit, Department of Medical Sciences, University of Turin, Via Santena 7, 10126 Turin, Italy; (A.G.); (A.A.)
| | - Mauro Papotti
- Pathology Unit, Department of Oncology, University of Turin, Via Santena 7, 10126 Turin, Italy;
| | - Paola Cassoni
- Pathology Unit, Department of Medical Sciences, University of Turin, Via Santena 7, 10126 Turin, Italy; (A.G.); (A.A.)
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16
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Abdelsalam M, Abd El Wahab AM, Nassar MK, Samaan E, Eldeep A, Abdalbary M, Tawfik M, Saleh M, Shemies RS, Sabry A. Kidneys in SARS-CoV-2 Era; a challenge of multiple faces. Ther Apher Dial 2022; 26:552-565. [PMID: 34989119 DOI: 10.1111/1744-9987.13792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 12/31/2021] [Accepted: 01/03/2022] [Indexed: 01/08/2023]
Abstract
INTRODUCTION With the evolution of SARS-CoV-2 pandemic, it was believed to be a direct respiratory virus. But, its deleterious effects were observed on different body systems, including kidneys. AIM OF WORK In this review, we tried as much as we can to summarize what has been discussed in the literature about the relation between SARS-CoV-2 infection and kidneys since December, 2019. METHODS Each part of the review was assigned to one or two authors to search for relevant articles in three databases (Pubmed, Scopus and Google scholar) and collected data were summarized and revised by two independent researchers. CONCLUSION The complexity of COVID-19 pandemic and kidney could be attributed to the direct effect of SARS-CoV-2 infection on the kidneys, different clinical presentation, difficulties confronting dialysis patients, restrictions of the organ transplant programs, poor outcomes and bad prognosis in patients with known history of kidney diseases who got infected with SARS-CoV-2. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Mostafa Abdelsalam
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
| | | | | | - Emad Samaan
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
| | - Ahmed Eldeep
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
| | - Mohamed Abdalbary
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt.,Division of Nephrology, Bone and Mineral Metabolism, University of Kentucky, US
| | - Mona Tawfik
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
| | - Marwa Saleh
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
| | | | - Alaa Sabry
- Mansoura Nephrology and Dialysis Unit, Mansoura University, Mansoura, Egypt
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17
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Daniel E, Sekulic M, Kudose S, Kubin C, Ye X, Shayan K, Patel A, Cohen DJ, E. Ratner L, Santoriello D, Barry Stokes M, Markowitz GS, Pereira MR, D’Agati VD, Batal I. Kidney allograft biopsy findings after COVID-19. Am J Transplant 2021; 21:4032-4042. [PMID: 34403563 PMCID: PMC8441660 DOI: 10.1111/ajt.16804] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 07/26/2021] [Accepted: 08/11/2021] [Indexed: 01/25/2023]
Abstract
COVID-19 has been associated with acute kidney injury and published reports of native kidney biopsies have reported diverse pathologies. Case series directed specifically to kidney allograft biopsy findings in the setting of COVID-19 are lacking. We evaluated 18 kidney transplant recipients who were infected with SARS-CoV-2 and underwent allograft biopsy. Patients had a median age of 55 years, six were female, and five were Black. Fifteen patients developed COVID-19 pneumonia, of which five required mechanical ventilation. Notably, five of 11 (45%) biopsies obtained within 1 month of positive SARS-CoV-2 PCR showed acute rejection (four with arteritis, three of which were not associated with reduced immunosuppression). The remaining six biopsies revealed podocytopathy (n = 2, collapsing glomerulopathy and lupus podocytopathy), acute tubular injury (n = 2), infarction (n = 1), and transplant glomerulopathy (n = 1). Biopsies performed >1 month after positive SARS-CoV-2 PCR revealed collapsing glomerulopathy (n = 1), acute tubular injury (n = 1), and nonspecific histologic findings (n = 5). No direct viral infection of the kidney allograft was detected by immunohistochemistry, in situ hybridization, or electron microscopy. On follow-up, two patients died and most patients showed persistent allograft dysfunction. In conclusion, we demonstrate diverse causes of kidney allograft dysfunction after COVID-19, the most common being acute rejection with arteritis.
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Affiliation(s)
- Emily Daniel
- Department of Medicine, Division of Nephrology, Columbia University Irving Medical Center, New York, New York, USA
| | - Miroslav Sekulic
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - Satoru Kudose
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - Christine Kubin
- Department of Pharmacy, New York Presbyterian Hospital, New York, New York, USA
| | - Xiaoyi Ye
- Department of Medicine, Nephrology, Hartford Hospital, Hartford, Connecticut, USA
| | - Katayoon Shayan
- Department of Pathology, Rady Children’s Specialists of San Diego, California, USA
| | - Ankita Patel
- Department of Medicine, Nephrology, Hackensack University Medical Center, Hackensack, New Jersey, USA
| | - David J. Cohen
- Department of Medicine, Division of Nephrology, Columbia University Irving Medical Center, New York, New York, USA
| | - Lloyd E. Ratner
- Department of Surgery, Renal and Pancreatic Transplantation, Columbia University Irving Medical Center, New York, New York, USA
| | - Dominick Santoriello
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - M. Barry Stokes
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - Glen S. Markowitz
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - Marcus R. Pereira
- Department of Medicine, Division of Infectious Disease, Columbia University Irving Medical Center, New York, New York, USA
| | - Vivette D. D’Agati
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA
| | - Ibrahim Batal
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York, USA,Correspondence Ibrahim Batal, Department of Pathology and Cell Biology, Renal Division, Columbia University Irving Medical Center, New York, NY, USA.
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18
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Jeyalan V, Storrar J, Wu HHL, Ponnusamy A, Sinha S, Kalra PA, Chinnadurai R. Native and transplant kidney histopathological manifestations in association with COVID-19 infection: A systematic review. World J Transplant 2021; 11:480-502. [PMID: 34868898 PMCID: PMC8603634 DOI: 10.5500/wjt.v11.i11.480] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 08/05/2021] [Accepted: 10/31/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) can result in clinically significant multi-system disease including involvement in the kidney. The underlying histopathological processes were unknown at the start of the pandemic. As case reports and series have been published describing the underlying renal histopathology from kidney biopsies, we have started to gain an insight into the renal manifestations of this novel disease.
AIM To provide an overview of the current literature on the renal histopathological features and mechanistic insights described in association with coronavirus disease 2019 (COVID-19) infection.
METHODS A systematic review was performed by conducting a literature search in the following websites-‘PubMed’, ‘Web of Science’, ‘Embase’ and ‘Medline-ProQuest’ with the following search terms-“COVID-19 AND kidney biopsy”, “COVID-19 AND renal biopsy”, “SARS-CoV-2 AND kidney biopsy” and “SARS-CoV-2 AND renal biopsy”. We have included published data up until February 15, 2021, which includes kidney biopsies (native, transplant and postmortem) from patients with COVID-19. Data on clinical presentation, histopathological features, management and outcome was extracted from the reported studies.
RESULTS The total number of biopsies reported on here is 288, of which 189 are postmortem, 84 native and 15 transplants. The results are varied and show underlying pathologies ranging from collapsing glomerulopathy and acute tubular injury (ATI) to anti-nuclear cytoplasmic antibody associated vasculitis and pigment nephropathy. There was variation in the specific treatment used for the various renal conditions, which included steroids, hydroxychloroquine, eculizumab, convalescent plasma, rituximab, anakinra, cyclophosphamide and renal replacement therapy, amongst others. The pathological process which occurs in the kidney following COVID-19 infection and leads to the described biopsy findings has been hypothesized in some conditions but not others (for example, sepsis related hypoperfusion for ATI). It is important to note that this represents a very small minority of the total number of cases of COVID-19 related kidney disease, and as such there may be inherent selection bias in the results described. Further work will be required to determine the pathogenetic link, if any, between COVID-19 and the other renal pathologies.
CONCLUSION This report has clinical relevance as certain renal pathologies have specific management, with the implication that kidney biopsy in the setting of renal disease and COVID-19 should be an early consideration, dependent upon the clinical presentation.
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Affiliation(s)
- Vishnu Jeyalan
- Department of Renal Medicine, Royal Preston Hospital, Preston PR2 9HT, United Kingdom
| | - Joshua Storrar
- Department of Renal Medicine, Salford Care Organisation, Northern Care Alliance NHS Foundation Trust, Salford M6 8HD, United Kingdom
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Henry H L Wu
- Department of Renal Medicine, Royal Preston Hospital, Preston PR2 9HT, United Kingdom
| | - Arvind Ponnusamy
- Department of Renal Medicine, Royal Preston Hospital, Preston PR2 9HT, United Kingdom
| | - Smeeta Sinha
- Department of Renal Medicine, Salford Care Organisation, Northern Care Alliance NHS Foundation Trust, Salford M6 8HD, United Kingdom
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Philip A Kalra
- Department of Renal Medicine, Salford Care Organisation, Northern Care Alliance NHS Foundation Trust, Salford M6 8HD, United Kingdom
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Rajkumar Chinnadurai
- Department of Renal Medicine, Salford Care Organisation, Northern Care Alliance NHS Foundation Trust, Salford M6 8HD, United Kingdom
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, United Kingdom
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19
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Hassler L, Reyes F, Sparks MA, Welling P, Batlle D. Evidence For and Against Direct Kidney Infection by SARS-CoV-2 in Patients with COVID-19. Clin J Am Soc Nephrol 2021; 16:1755-1765. [PMID: 34127485 PMCID: PMC8729421 DOI: 10.2215/cjn.04560421] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Despite evidence of multiorgan tropism of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in patients with coronavirus disease 2019 (COVID-19), direct viral kidney invasion has been difficult to demonstrate. The question of whether SARS-CoV2 can directly infect the kidney is relevant to the understanding of pathogenesis of AKI and collapsing glomerulopathy in patients with COVID-19. Methodologies to document SARS-CoV-2 infection that have been used include immunohistochemistry, immunofluorescence, RT-PCR, in situ hybridization, and electron microscopy. In our review of studies to date, we found that SARS-CoV-2 in the kidneys of patients with COVID-19 was detected in 18 of 94 (19%) by immunohistochemistry, 71 of 144 (49%) by RT-PCR, and 11 of 84 (13%) by in situ hybridization. In a smaller number of patients with COVID-19 examined by immunofluorescence, SARS-CoV-2 was detected in 10 of 13 (77%). In total, in kidneys from 102 of 235 patients (43%), the presence of SARS-CoV-2 was suggested by at least one of the methods used. Despite these positive findings, caution is needed because many other studies have been negative for SARS-CoV-2 and it should be noted that when detected, it was only in kidneys obtained at autopsy. There is a clear need for studies from kidney biopsies, including those performed at early stages of the COVID-19-associated kidney disease. Development of tests to detect kidney viral infection in urine samples would be more practical as a noninvasive way to evaluate SARS-CoV-2 infection during the evolution of COVID-19-associated kidney disease.
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Affiliation(s)
- Luise Hassler
- Division of Nephrology and Hypertension, Northwestern University, Chicago, Illinois
| | - Fabiola Reyes
- Divison of Infectious Diseases, Brigham and Women's Hospital, Boston, Massachusetts
| | - Matthew A. Sparks
- Division of Nephrology, Duke University School of Medicine, Durham, North Carolina
- Renal Section, Durham Veterans Affairs Health Care System, Durham, North Carolina
| | - Paul Welling
- Departments of Medicine (Nephrology) and Physiology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Daniel Batlle
- Division of Nephrology and Hypertension, Northwestern University, Chicago, Illinois
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20
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Basic-Jukic N, Coric M, Bulimbasic S, Dika Z, Juric I, Furic-Cunko V, Katalinic L, Kos J, Fistrek M, Kastelan Z, Jelakovic B. Histopathologic findings on indication renal allograft biopsies after recovery from acute COVID-19. Clin Transplant 2021; 35:e14486. [PMID: 34532893 PMCID: PMC8646844 DOI: 10.1111/ctr.14486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/10/2021] [Accepted: 09/13/2021] [Indexed: 12/30/2022]
Abstract
Current knowledge on histopathological changes occurring after COVID‐19 in transplanted kidneys is limited. Herein, we present renal allograft pathology findings in patients recovered from COVID‐19. Six patients underwent indication biopsy, and one required allograft nephrectomy after acute COVID‐19. Demographic data, clinical characteristics, and laboratory findings were recorded. The histopathological analysis included light microscopy, immunostaining, and electron microscopy. Five patients were hospitalized for acute COVID‐19, and all were diagnosed with imaging‐confirmed pneumonia, one requiring mechanical ventilation, and two requiring dialysis. Two patients had mild form. Histopathologic examination of renal allograft specimens revealed collapsing, perihilar, tip‐lesion and secondary FSGS in one patient each. One patient had borderline acute cellular rejection, and two had chronic antibody‐mediated rejection. Histopathologic changes of glomerular tufts were accompanied by acute tubular injury in four patients. None of our patients had signs of viral inclusions in kidney cells. One patient died and one remained dialysis‐dependent after the good initial response to treatment. Patients with collapsing and perihilar FSGS had further progression of their chronic allograft nephropathy still without need for dialysis. In conclusion, diverse kidney pathology may be found in SARS‐CoV‐2–infected renal transplant patients. It seems that viral infection may affect the immune system with triggering of glomerular diseases, while the acute tubular injury is of multifactorial etiology. Direct viral effect is less likely.
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Affiliation(s)
- Nikolina Basic-Jukic
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia.,School of medicine, Sveučilište u Zagrebu Medicinski fakultet, Zagreb, Croatia
| | - Marijana Coric
- Department of pathology, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Stela Bulimbasic
- Department of pathology, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Zivka Dika
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Ivana Juric
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Vesna Furic-Cunko
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Lea Katalinic
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Jelena Kos
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Margareta Fistrek
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia
| | - Zeljko Kastelan
- Department of Urology, University Hospital center Zagreb, Zagreb, Croatia
| | - Bojan Jelakovic
- Department of Nephrology, Arterial Hypertension and Dialysis, Klinički bolnički centar Zagreb, Zagreb, Croatia.,School of medicine, Sveučilište u Zagrebu Medicinski fakultet, Zagreb, Croatia
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21
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May RM, Cassol C, Hannoudi A, Larsen CP, Lerma E, Haun RS, Braga JR, Hassen SI, Wilson J, VanBeek C, Vankalakunti M, Barnum L, Walker PD, Bourne TD, Messias NC, Ambruzs JM, Boils CL, Sharma SS, Cossey LN, Baxi PV, Palmer M, Zuckerman J, Walavalkar V, Urisman A, Gallan A, Al-Rabadi LF, Rodby R, Luyckx V, Espino G, Santhana-Krishnan S, Alper B, Lam SG, Hannoudi GN, Matthew D, Belz M, Singer G, Kunaparaju S, Price D, Sauabh C, Rondla C, Abdalla MA, Britton ML, Paul S, Ranjit U, Bichu P, Williamson SR, Sharma Y, Gaspert A, Grosse P, Meyer I, Vasudev B, El Kassem M, Velez JCQ, Caza TN. A multi-center retrospective cohort study defines the spectrum of kidney pathology in Coronavirus 2019 Disease (COVID-19). Kidney Int 2021; 100:1303-1315. [PMID: 34352311 PMCID: PMC8328528 DOI: 10.1016/j.kint.2021.07.015] [Citation(s) in RCA: 90] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 07/14/2021] [Accepted: 07/23/2021] [Indexed: 12/12/2022]
Abstract
Kidney failure is common in patients with Coronavirus Disease-19 (COVID-19) resulting in increased morbidity and mortality. In an international collaboration, 284 kidney biopsies were evaluated to improve understanding of kidney disease in COVID-19. Diagnoses were compared to five years of 63,575 native biopsies prior to the pandemic and 13,955 allograft biopsies to identify diseases increased in patients with COVID-19. Genotyping for APOL1 G1 and G2 alleles was performed in 107 African American and Hispanic patients. Immunohistochemistry for SARS-CoV-2 was utilized to assess direct viral infection in 273 cases along with clinical information at the time of biopsy. The leading indication for native biopsy was acute kidney injury (45.4%), followed by proteinuria with or without concurrent acute kidney injury (42.6%). There were more African American patients (44.6%) than patients of other ethnicities. The most common diagnosis in native biopsies was collapsing glomerulopathy (25.8%) which associated with high-risk APOL1 genotypes in 91.7% of cases. Compared to the five-year biopsy database, the frequency of myoglobin cast nephropathy and proliferative glomerulonephritis with monoclonal IgG deposits was also increased in patients with COVID-19 (3.3% and 1.7%, respectively), while there was a reduced frequency of chronic conditions (including diabetes mellitus, IgA nephropathy, and arterionephrosclerosis) as the primary diagnosis. In transplants, the leading indication was acute kidney injury (86.4%), for which rejection was the predominant diagnosis (61.4%). Direct SARS-CoV-2 viral infection was not identified. Thus, our multi-center large case series identified kidney diseases that disproportionately affect patients with COVID-19, demonstrated a high frequency of APOL1 high-risk genotypes within this group, with no evidence of direct viral infection within the kidney.
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Affiliation(s)
- Rebecca M May
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Clarissa Cassol
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Andrew Hannoudi
- University of Michigan, 500 S State Street, Ann Arbor, MI USA 48109
| | - Christopher P Larsen
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Edgar Lerma
- University of Illinois at Chicago College of Medicine / Advocate Christ Medical Center, Department of Internal Medicine, 1853 W Polk St, Oak Lawn IL USA 60612
| | - Randy S Haun
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Juarez R Braga
- University of Arkansas for Medical Sciences, Nephrology Division, 4301 W Markham St, Little Rock, AR USA 72205
| | - Samar I Hassen
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Jon Wilson
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Christine VanBeek
- AmeriPath Laboratories, Pathology, 225 N.E. 97(th) St #600, Oklahoma City OK USA 73114
| | - Mahesha Vankalakunti
- Manipal Hospital - Bangalore, Department of Pathology, 98 HAL Old Airport Rd, Bangalore, Karnataka India 560017
| | - Lilli Barnum
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Patrick D Walker
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - T David Bourne
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Nidia C Messias
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Josephine M Ambruzs
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Christie L Boils
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Shree S Sharma
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - L Nicholas Cossey
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211
| | - Pravir V Baxi
- Rush University Medical Center, Nephrology Division, 1620 W. Harrison St, Chicago IL USA 60612
| | - Matthew Palmer
- University of Pennsylvania Perelman School of Medicine, Department of Pathology, 3400 Civic Center Blvd, Philadelphia PA USA 19104
| | - Jonathan Zuckerman
- University of California Los Angeles Health System, Department of Pathology and Laboratory Medicine, 140833 Le Conte Ave, Los Angeles, CA USA 90095
| | - Vighnesh Walavalkar
- UCSF Medical Center, Department of Pathology, 505 Panassus Avenue, CA USA 92103
| | - Anatoly Urisman
- UCSF Medical Center, Department of Pathology, 505 Panassus Avenue, CA USA 92103
| | - Alexander Gallan
- Medical College of Wisconsin, 9200 W. Wisconsin Avenue, WDL Building L73, Milkaukee, WI USA 53226
| | - Laith F Al-Rabadi
- University of Utah School of Medicine, 50 N Medical Drive, Salt Lake City UT 84132
| | - Roger Rodby
- Rush University Medical Center, Nephrology Division, 1620 W. Harrison St, Chicago IL USA 60612
| | - Valerie Luyckx
- University of Zurich, Department of Pathology and Molecular Biology, University Hospital Zurich, Schmelzberstrasse 8091, Zurich, Switzerland; Brigham and Women's Hospital, Renal Division, 75 Francis Street, Boston, MA USA 02115
| | - Gusavo Espino
- Albuquerque Nephrology Associates, 4333 Pan American Fwy NE, Albuquerque, NM USA 87107
| | | | - Brent Alper
- Tulane University School of Medicine, Tulane University Hypertension and Renal Center of Excellence, 6823 St. Charles Avenue, New Orleans, LA USA 70118; Tulane School of Medicine, 1430 Tulane Ave, New Orleans, LA USA 70112
| | - Son G Lam
- Nephrology and Hypertension Associated LTD, 1790 Barron Street, Oxford, MS USA 38655
| | - Ghadeer N Hannoudi
- Michigan Kidney Consultants, 44200 Woodward Ave, Suite 209, Pontiac, MI USA 48341
| | - Dwight Matthew
- Shoals Kidney & Hypertension Center, 422 East Dr Hicks Boulevard, Suite A, Florence, AL USA 35630
| | - Mark Belz
- Iowa Kidney Physicians PC, 1215 Pleasant Street, Suite 100, Des Moines, IA USA 50309
| | - Gary Singer
- Midwest Nephrology Associates, 70 Jungermann Circle, Suite 405, St. Peters, MO USA 63376
| | - Srikanth Kunaparaju
- Richmond Nephrology Associates, 7001 West Broad Street, Suite A, Richmond, VA USA 23294
| | - Deborah Price
- Nephrology Associates of NE Florida, 2 Shircliff Way DePaul Bldg Suite 700, Jacksonville, FL USA 32204
| | - Chawla Sauabh
- Northwest Indiana Nephrology, 6061 Broadway, Merrillville, IN USA 46410
| | - Chetana Rondla
- Georgia Nephrology, 595 Hurricane Shoals Road NW, Suite 100, Lawrenceville, GA USA 30046
| | - Mazen A Abdalla
- The Kidney Clinic, 2386 Clower Street, Suite C105, Snellville, GA USA 30078
| | - Marcus L Britton
- Nephrology & Hypertension Associates LTD, 1542 Medical Park Circle, Tupelo, MS USA 38801
| | - Subir Paul
- Shoals Kidney & Hypertension Center, 422 East Dr Hicks Boulevard, Suite A, Florence, AL USA 35630
| | - Uday Ranjit
- Nephrology Associates of Central Florida, 2501 N Orange Avenue #53, Orlando, FL USA 32804
| | - Prasad Bichu
- Nephrology Associates of Tidewater Ltd., Norfolk, VA USA 23510
| | | | - Yuvraj Sharma
- Henry Ford Hospital, 2799 W Grand Blvd, Detroit, MI USA 48202
| | - Ariana Gaspert
- Kantonal Hospital of Graubunden, Loestrasse 170, CH-7000, Chur, Switzerland
| | - Phillipp Grosse
- University of Zurich, Department of Pathology and Molecular Biology, University Hospital Zurich, Schmelzberstrasse 8091, Zurich, Switzerland
| | - Ian Meyer
- Mt Auburn Nephrology, 8260 Pine Road, Cincinnati OH USA 45236
| | - Brahm Vasudev
- Medical College of Wisconsin, 9200 W. Wisconsin Avenue, WDL Building L73, Milkaukee, WI USA 53226
| | - Mohamad El Kassem
- Mohamad El Kassem MD (private practice), Nephrology, Coral Springs, FL USA
| | - Juan Carlos Q Velez
- Ochsner Health System, Deparment of Nephrology, 1514 Jefferson Hwy, New Orleans LA USA 70121; Ochsner Clinical School, The University of Queensland (Australia), Department of Nephrology, St. Lucia, QLD, AUS
| | - Tiffany N Caza
- Arkana Laboratories, 10810 Executive Center Drive #100, Little Rock AR USA 72211.
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22
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Abstract
PURPOSE OF REVIEW The current review summarizes the pathologic findings in kidneys from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-infected patients who have had autopsies or undergone biopsy, and the pathogenic mechanisms implicated in coronavirus disease 2019 (COVID-19)-associated kidney diseases. RECENT FINDINGS Direct infection of the kidney by SARS-CoV-2 is not common, and convincing morphologic evidence of substantive kidney infection by SARS-CoV-2 is lacking. Severe COVID-19-associated acute kidney injury is likely multifactorial and results from the physiologic disturbances and therapies used to treat this illness. COVID-19-associated collapsing glomerulopathy (COVAN) is seen almost exclusively in patients with apolipoprotein L1 high-risk genotypes with no evidence of direct infection of the kidney by SARS-CoV-2. SUMMARY The prevailing evidence does not support substantive or persistent infection of kidneys in COVID-19 and indirect means of tissue injury are favored, although a 'hit and run' model cannot be excluded. COVAN frequently occurs in patients with mild respiratory systems, suggesting that innate and adaptive immune responses to SARS-CoV-2 infection may provide the second hit needed for the development of collapsing glomerulopathy in susceptible individuals.
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23
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de Oliveira P, Cunha K, Neves P, Muniz M, Gatto G, Salgado Filho N, Guedes F, Silva G. Renal Morphology in Coronavirus Disease: A Literature Review. MEDICINA (KAUNAS, LITHUANIA) 2021; 57:258. [PMID: 33799854 PMCID: PMC7998438 DOI: 10.3390/medicina57030258] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 12/28/2022]
Abstract
Renal biopsy is useful to better understand the histological pattern of a lesion (glomerular, tubulointerstitial, and vascular) and the pathogenesis that leads to kidney failure. The potential impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on the kidneys is still undetermined, and a variety of lesions are seen in the kidney tissue of coronavirus disease patients. This review is based on the morphological findings of patients described in case reports and a series of published cases. A search was conducted on MEDLINE and PubMed of case reports and case series of lesions in the presence of non-critical infection by SARS-CoV-2 published until 15/09/2020. We highlight the potential of the virus directly influencing the damage or the innate and adaptive immune response activating cytokine and procoagulant cascades, in addition to the genetic component triggering glomerular diseases, mainly collapsing focal segmental glomerulosclerosis, tubulointerstitial, and even vascular diseases. Kidney lesions caused by SARS-CoV-2 are frequent and have an impact on morbidity and mortality; thus, studies are needed to assess the morphological kidney changes and their mechanisms and may help define their spectrum and immediate or long-term impact.
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Affiliation(s)
- Patrick de Oliveira
- Nephrology Service, Onofre Lopes University Hospital, Federal University of Rio Grande do Norte, Natal 59066-230, RN, Brazil; (P.d.O.); (F.G.)
| | - Kaile Cunha
- University Hospital of Federal University of Maranhão, São Luis 65020-070, MA, Brazil; (K.C.); (M.M.); (N.S.F.)
| | - Precil Neves
- Nephrology Division, University of São Paulo Medical School, São Paulo 05403-000, SP, Brazil;
| | - Monique Muniz
- University Hospital of Federal University of Maranhão, São Luis 65020-070, MA, Brazil; (K.C.); (M.M.); (N.S.F.)
| | - Giuseppe Gatto
- Nephrology Service, University Hospital of Brasília, Brasília 70840-901, DF, Brazil;
| | - Natalino Salgado Filho
- University Hospital of Federal University of Maranhão, São Luis 65020-070, MA, Brazil; (K.C.); (M.M.); (N.S.F.)
| | - Felipe Guedes
- Nephrology Service, Onofre Lopes University Hospital, Federal University of Rio Grande do Norte, Natal 59066-230, RN, Brazil; (P.d.O.); (F.G.)
| | - Gyl Silva
- Patology Department, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil
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24
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Toapanta N, Torres IB, Sellarés J, Chamoun B, Serón D, Moreso F. Kidney transplantation and COVID-19 renal and patient prognosis. Clin Kidney J 2021; 14:i21-i29. [PMID: 33815780 PMCID: PMC7995521 DOI: 10.1093/ckj/sfab030] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/27/2021] [Indexed: 02/07/2023] Open
Abstract
Coronavirus disease 2019 (COVD-19) emerged as a pandemic in December 2019. Infection has spread quickly and renal transplant recipients receiving chronic immunosuppression have been considered a population at high risk of infection, complications and infection-related death. During this year a large amount of information from nationwide registries, multicentre and single-centre studies have been reported. The number of renal transplant patients diagnosed with COVID-19 was higher than in the general population, but the lower threshold for testing may have contributed to its better identification. Major complications such as acute kidney injury and acute respiratory distress syndrome were very frequent in renal transplant patients, with a high comorbidity burden, but further studies are needed to support that organ transplant recipients receiving chronic immunosuppression are more prone to develop these complications than the general population. Kidney transplant recipients experience a high mortality rate compared with the general population, especially during the very early post-transplant period. Despite the fact that some studies report more favourable outcomes in patients with a kidney transplant than in patients on the kidney waiting list, the higher mortality described in the very early post-transplant period would advise against performing a kidney transplant in areas where the spread of infection is high, especially in recipients >60 years of age. Management of transplant recipients has been challenging for clinicians and strategies such as less use of lymphocyte-depleting agents for new transplants or anti-metabolite withdrawal and calcineurin inhibitor reduction for transplant patients with COVID-19 are not based on high-quality evidence.
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Affiliation(s)
- Néstor Toapanta
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Irina B Torres
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Joana Sellarés
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Betty Chamoun
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Daniel Serón
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
| | - Francesc Moreso
- Department of Nephrology, Hospital Universitari Vall d’Hebron, Barcelona, Spain
- Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain
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25
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Laboux T, Gibier JB, Pottier N, Glowacki F, Hamroun A. COVID-19-related collapsing glomerulopathy revealing a rare risk variant of APOL1: lessons for the clinical nephrologist. J Nephrol 2021; 34:373-378. [PMID: 33548053 PMCID: PMC7865108 DOI: 10.1007/s40620-020-00935-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 11/20/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Timothée Laboux
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France.
- RID-AGE, INSERM U1167, 59000, Lille, France.
| | - Jean-Baptiste Gibier
- Department of Pathology, Pathology Institute, Lille University, Regional and University Hospital Center of Lille, Lille, France
- INSERM UMR-S1172 Lille, JPARC-Jean-Pierre Aubert Research Center, Team Mucins, Epithelial Differentiation and Carcinogenesis, 59037, Lille, France
| | - Nicolas Pottier
- Toxicology and Genopathy Department, CHU Lille, 59000, Lille, France
- INSERM U1190, Translational Research for Diabetes, Lille, France
| | - François Glowacki
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France
- CNRS, INSERM, Lille University, UMR9020- UMR-S 1277, F-59000, Lille, France
| | - Aghilès Hamroun
- Kidney Transplantation and Dialysis Department, University of Lille, CHU Lille, 59037, Lille, France
- Clinical Epidemiology Team, Center for Research in Epidemiology and Population Health, INSERM, Paris-Saclay University, Versailles Saint-Quentin University, CESP, 94807, Villejuif, France
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26
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Shabaka A, Rovirosa-Bigot S, Guerrero Márquez C, Alonso Riaño M, Fernández-Juárez G. Acute kidney injury and nephrotic syndrome secondary to COVID-19-associated focal segmental glomerulosclerosis. Nefrologia 2021; 42:S0211-6995(21)00007-2. [PMID: 33610371 DOI: 10.1016/j.nefro.2020.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 10/29/2020] [Indexed: 12/28/2022] Open
Affiliation(s)
- Amir Shabaka
- Servicio de Nefrología. Hospital Universitario Fundación Alcorcón, Madrid, España.
| | - Sofía Rovirosa-Bigot
- Servicio de Medicina Intensiva. Hospital Universitario Fundación Alcorcón, Madrid, España
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27
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Molecular Mechanisms of Renal Progenitor Regulation: How Many Pieces in the Puzzle? Cells 2021; 10:cells10010059. [PMID: 33401654 PMCID: PMC7823786 DOI: 10.3390/cells10010059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/26/2020] [Accepted: 12/29/2020] [Indexed: 12/12/2022] Open
Abstract
Kidneys of mice, rats and humans possess progenitors that maintain daily homeostasis and take part in endogenous regenerative processes following injury, owing to their capacity to proliferate and differentiate. In the glomerular and tubular compartments of the nephron, consistent studies demonstrated that well-characterized, distinct populations of progenitor cells, localized in the parietal epithelium of Bowman capsule and scattered in the proximal and distal tubules, could generate segment-specific cells in physiological conditions and following tissue injury. However, defective or abnormal regenerative responses of these progenitors can contribute to pathologic conditions. The molecular characteristics of renal progenitors have been extensively studied, revealing that numerous classical and evolutionarily conserved pathways, such as Notch or Wnt/β-catenin, play a major role in cell regulation. Others, such as retinoic acid, renin-angiotensin-aldosterone system, TLR2 (Toll-like receptor 2) and leptin, are also important in this process. In this review, we summarize the plethora of molecular mechanisms directing renal progenitor responses during homeostasis and following kidney injury. Finally, we will explore how single-cell RNA sequencing could bring the characterization of renal progenitors to the next level, while knowing their molecular signature is gaining relevance in the clinic.
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