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Jacobs-Cachá C, Puig-Gay N, Helm D, Rettel M, Sellarès J, Meseguer A, Savitski MM, Moreso FJ, Soler MJ, Seron D, Lopez-Hellin J. A misprocessed form of Apolipoprotein A-I is specifically associated with recurrent Focal Segmental Glomerulosclerosis. Sci Rep 2020; 10:1159. [PMID: 31980684 PMCID: PMC6981185 DOI: 10.1038/s41598-020-58197-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 01/10/2020] [Indexed: 12/29/2022] Open
Abstract
Apolipoprotein A-Ib (ApoA-Ib) is a high molecular weight form of Apolipoprotein A-I (ApoA-I) found specifically in the urine of kidney-transplanted patients with recurrent idiopathic focal segmental glomerulosclerosis (FSGS). To determine the nature of the modification present in ApoA-Ib, we sequenced the whole APOA1 gene in ApoA-Ib positive and negative patients, and we also studied the protein primary structure using mass spectrometry. No genetic variations in the APOA1 gene were found in the ApoA-Ib positive patients that could explain the increase in its molecular mass. The mass spectrometry analysis revealed three extra amino acids at the N-Terminal end of ApoA-Ib that were not present in the standard plasmatic form of ApoA-I. These amino acids corresponded to half of the propeptide sequence of the immature form of ApoA-I (proApoA-I) indicating that ApoA-Ib is a misprocessed form of proApoA-I. The description of ApoA-Ib could be relevant not only because it can allow the automated analysis of this biomarker in the clinical practice but also because it has the potential to shed light into the molecular mechanisms that cause idiopathic FSGS, which is currently unknown.
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Affiliation(s)
- Conxita Jacobs-Cachá
- Nephrology Research Group, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain. .,Nephrology Department, Hospital Vall d'Hebrón, Barcelona, Spain.
| | - Natàlia Puig-Gay
- Renal Physiopathology Group-CIBBIM. Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | - Dominic Helm
- Proteomics Core Facility, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Mandy Rettel
- Proteomics Core Facility, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Joana Sellarès
- Nephrology Research Group, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain.,Nephrology Department, Hospital Vall d'Hebrón, Barcelona, Spain
| | - Anna Meseguer
- Renal Physiopathology Group-CIBBIM. Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | - Mikhail M Savitski
- Proteomics Core Facility, European Molecular Biology Laboratory, Heidelberg, Germany.,Genome Biology, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Francesc J Moreso
- Nephrology Research Group, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain.,Nephrology Department, Hospital Vall d'Hebrón, Barcelona, Spain
| | - Maria José Soler
- Nephrology Research Group, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain.,Nephrology Department, Hospital Vall d'Hebrón, Barcelona, Spain
| | - Daniel Seron
- Nephrology Research Group, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain.,Nephrology Department, Hospital Vall d'Hebrón, Barcelona, Spain
| | - Joan Lopez-Hellin
- Renal Physiopathology Group-CIBBIM. Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain. .,Biochemistry Department, Hospital Vall d'Hebrón, Barcelona, Spain.
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Jacobs Cachá C, Puig Gay N, Joana S, Guirado L, Gonzalez-Roncero F, Jiménez C, Zárraga S, Paul J, Lauzurica R, Alonso ÁN, Fernandez A, Mazuecos A, Hernandez D, Rodriguez-Benot A, Crespo M, Meseguer A, Moreso F, Seron D, Cantarell C, Lopez-Hellin J. FP205APOLIPOPROTEIN A-IB AS BIOMARKER OF FSGS RECURRENCE AFTER KIDNEY TRANSPLANTATION: DIAGNOSTIC PERFORMANCE AND ASSESSMENT OF ITS PROGNOSTIC VALUE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | | | - Sellarés Joana
- Hospital Vall d'Hebrón Institut de Recerca, Barcelona, Spain
| | | | | | | | | | | | | | - ÁNgel Alonso
- Hospital Universitario de A Coruña, A Coruña, Spain
| | | | | | | | | | | | - Anna Meseguer
- Hospital Vall d'Hebrón Institut de Recerca, Barcelona, Spain
| | - Francesc Moreso
- Hospital Vall d'Hebrón Institut de Recerca, Barcelona, Spain
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Puig-Gay N, Jacobs-Cacha C, Sellarès J, Guirado L, González Roncero F, Jiménez C, Zárraga S, Paul J, Lauzurica R, Alonso Á, Fernández A, Beneyto I, Mazuecos A, Hernández D, Rodriguez-Benot A, Franco A, Jimeno L, Crespo M, Meseguer A, Moreso F, Seron D, Lopez-Hellin J, Cantarell C. Apolipoprotein A-Ib as a biomarker of focal segmental glomerulosclerosis recurrence after kidney transplantation: diagnostic performance and assessment of its prognostic value - a multi-centre cohort study. Transpl Int 2018; 32:313-322. [PMID: 30411406 DOI: 10.1111/tri.13372] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/05/2018] [Accepted: 10/31/2018] [Indexed: 01/02/2023]
Abstract
Recurrence of idiopathic focal segmental glomerulosclerosis (FSGS) is a serious complication after kidney transplantation. FSGS relapse is suspected by a sudden increase in proteinuria but there is not an accurate noninvasive diagnostic tool to confirm this entity or to detect patients at risk. We aimed to validate the diagnostic performance of ApoA-Ib to detect FSGS relapses by measuring urinary ApoA-Ib in a retrospective cohort of 61 kidney transplanted patients (37 FSGS and 24 non-FSGS). In addition, to assess the ApoA-Ib predictive ability, ApoA-Ib was measured periodically in a prospective cohort of 13 idiopathic FSGS patients who were followed during 1 year after transplantation. ApoA-Ib had a sensitivity of 93.3% and a specificity of 90.9% to diagnose FSGS relapses, with a high negative predictive value (95.2%), confirming our previous results. In the prospective cohort, ApoA-Ib predated the recurrence in four of five episodes observed. In the nonrelapsing group (n = 9), ApoA-Ib was negative in 37 of 38 samples. ApoA-Ib has the potential to be a good diagnostic biomarker of FSGS relapses, providing a confident criterion to exclude false positives even in the presence of high proteinuria. It has also the potential to detect patients at risk of relapse, even before transplantation.
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Affiliation(s)
- Natàlia Puig-Gay
- Renal Physiopathology Group-CIBBIM, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | - Conxita Jacobs-Cacha
- Renal Physiopathology Group-CIBBIM, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain.,Nephrology, Hospital Vall d'Hebron, Barcelona, Spain
| | | | | | | | - Carlos Jiménez
- Nephrology, Hospital Universitario La Paz, Madrid, Spain
| | | | - Javier Paul
- Nephrology, Hospital Miguel Servet, Zaragoza, Spain
| | | | - Ángel Alonso
- Nephrology, Hospital Universitario de A Coruña, A Coruña, Spain
| | | | - Isabel Beneyto
- Nephrology, Hospital Universitari i Politecnic La Fe, Valencia, Spain
| | | | | | | | | | - Luisa Jimeno
- Nephrology, Hospital Virgen de la Arrixaca, Murcia, Spain
| | | | - Anna Meseguer
- Renal Physiopathology Group-CIBBIM, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | | | - Daniel Seron
- Nephrology, Hospital Vall d'Hebron, Barcelona, Spain
| | - Joan Lopez-Hellin
- Renal Physiopathology Group-CIBBIM, Hospital Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
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Lopez-Hellin J, Cantarell C, Jimeno L, Sanchez-Fructuoso A, Puig-Gay N, Guirado L, Vilariño N, Gonzalez-Roncero FM, Mazuecos A, Lauzurica R, Burgos D, Plumed JS, Jacobs-Cacha C, Jimenez C, Fernandez A, Fernandez-Alvarez P, Torregrosa V, Nieto JL, Meseguer A, Alonso A. A form of apolipoprotein a-I is found specifically in relapses of focal segmental glomerulosclerosis following transplantation. Am J Transplant 2013; 13:493-500. [PMID: 23205849 DOI: 10.1111/j.1600-6143.2012.04338.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 09/21/2012] [Accepted: 10/13/2012] [Indexed: 01/25/2023]
Abstract
Recurrence of idiopathic focal segmental glomerulosclerosis (FSGS) following kidney transplantation occurs in a large percentage of patients. Accurate prediction of recurrence and elucidation of its pathogenesis are major therapeutic goals. To detect differential proteins related to FSGS recurrence, proteomic analysis was performed on plasma and urine samples from 35 transplanted idiopathic FSGS patients, divided into relapsing and nonrelapsing. Several proteins were detected increased in urine of relapsing FSGS patients, including a high molecular weight form of apolipoprotein A-I, named ApoA-Ib, found exclusively in relapsing patients. This finding was verified by Western blot individually in the 35 patients and validated in an independent group of 40 patients with relapsing or nonrelapsing FSGS, plus two additional groups: FSGS-unrelated patients showing different proteinuria levels (n = 30), and familial FSGS transplanted patients (n = 14). In the total of 119 patients studied, the ApoA-Ib form was detected in 13 of the 14 relapsing FSGS patients, and in one of the 61 nonrelapsing patients. Only one of the 30 patients with FSGS-unrelated proteinuria tested positive for ApoA-Ib, and was not detected in familial patients. Urinary ApoA-Ib is associated with relapses in idiopathic FSGS and warrants additional investigation to determine its usefulness as biomarker of relapse following transplantation.
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Affiliation(s)
- J Lopez-Hellin
- Kidney Pathophysiology, CIBBIM-Nanomedicine, Hospital Universitari Vall d'Hebron, Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Barcelona, Spain.
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Abstract
Cumulative damage in cells from aged people could lead to a greater fragility against acute oxidative stress. The effects of acute oxidative stress on cell viability, cAMP and cGMP concentrations, and protein synthesis rates were studied in lymphocytes from 25 young and 26 elderly subjects. Lymphocytes were exposed to stress by hydrogen peroxide 25 micromol/l and incubated for 18 hours. Cell viability after stress was lower (p<0.0001, Student's t test) in cells from the elderly (63.4%) than in cells from the young donors (73.2%). The protein synthesis rate was also lower after stress (p<0.04, Mann-Whitney U test) in cells from the elderly (47.3% vs. non-stressed cells), than in cells from the young (82.19% vs. non-stressed cells). After oxidative stress, cAMP and cGMP concentrations showed no significant changes in cells from young subjects; there were, however, significant decreases in these cyclic nucleotides in cells from the elderly (p<0.008 for both nucleotides, paired Student's t test). There were no differences in basal cAMP or cGMP levels between the two groups. These results show that mortality and metabolic changes due to oxidative stress are greater in lymphocytes proceeding from elderly subjects than in those from young subjects.
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Affiliation(s)
- J Lopez-Hellin
- Unitat de Recerques Metabòliques S. Grisolía, Centre d'Investigacions en Bioquímica i Biologia Molecular, Hospitals Vall d'Hebron, Barcelona, Spain
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