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      MicroRNAs as Biomarkers for Nephrotic Syndrome

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          Abstract

          Nephrotic syndrome represents the clinical situation characterized by presence of massive proteinuria and low serum protein caused by a variety of diseases, including minimal change nephrotic syndrome (MCNS), focal segmental glomerulosclerosis (FSGS) and membranous glomerulonephropathy. Differentiating between diagnoses requires invasive renal biopsies in general. Even with the biopsy, we encounter difficulties to differentiate MCNS and FSGS in some cases. There is no other better option currently available for the diagnosis other than renal biopsy. MicroRNAs (miRNAs) are no-coding RNAs of approximately 20 nucleotides in length, which regulate target genes in the post-transcriptional processes and have essential roles in many diseases. MiRNAs in serum and urine have been shown as non-invasive biomarkers in multiple diseases, including renal diseases. In this article, we summarize the current knowledge of miRNAs as the promising biomarkers for nephrotic syndrome.

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          MicroRNAs: genomics, biogenesis, mechanism, and function.

          David Bartel (2004)
          MicroRNAs (miRNAs) are endogenous approximately 22 nt RNAs that can play important regulatory roles in animals and plants by targeting mRNAs for cleavage or translational repression. Although they escaped notice until relatively recently, miRNAs comprise one of the more abundant classes of gene regulatory molecules in multicellular organisms and likely influence the output of many protein-coding genes.
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            Overview of MicroRNA Biogenesis, Mechanisms of Actions, and Circulation

            Jacob O'Brien, Heyam Hayder, Yara Zayed … (2018)
            MicroRNAs (miRNAs) are a class of non-coding RNAs that play important roles in regulating gene expression. The majority of miRNAs are transcribed from DNA sequences into primary miRNAs and processed into precursor miRNAs, and finally mature miRNAs. In most cases, miRNAs interact with the 3′ untranslated region (3′ UTR) of target mRNAs to induce mRNA degradation and translational repression. However, interaction of miRNAs with other regions, including the 5′ UTR, coding sequence, and gene promoters, have also been reported. Under certain conditions, miRNAs can also activate translation or regulate transcription. The interaction of miRNAs with their target genes is dynamic and dependent on many factors, such as subcellular location of miRNAs, the abundancy of miRNAs and target mRNAs, and the affinity of miRNA-mRNA interactions. miRNAs can be secreted into extracellular fluids and transported to target cells via vesicles, such as exosomes, or by binding to proteins, including Argonautes. Extracellular miRNAs function as chemical messengers to mediate cell-cell communication. In this review, we provide an update on canonical and non-canonical miRNA biogenesis pathways and various mechanisms underlying miRNA-mediated gene regulations. We also summarize the current knowledge of the dynamics of miRNA action and of the secretion, transfer, and uptake of extracellular miRNAs.
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              M-type phospholipase A2 receptor as target antigen in idiopathic membranous nephropathy.

              Gérard Lambeau, Ramon G. Bonegio, Judith Beck … (2009)
              Idiopathic membranous nephropathy, a common form of the nephrotic syndrome, is an antibody-mediated autoimmune glomerular disease. Serologic diagnosis has been elusive because the target antigen is unknown. We performed Western blotting of protein extracts from normal human glomeruli with serum samples from patients with idiopathic or secondary membranous nephropathy or other proteinuric or autoimmune diseases and from normal controls. We used mass spectrometry to analyze the reactive protein bands and confirmed the identity and location of the target antigen with a monospecific antibody. Serum samples from 26 of 37 patients (70%) with idiopathic but not secondary membranous nephropathy specifically identified a 185-kD glycoprotein in nonreduced glomerular extract. Mass spectrometry of the reactive protein band detected the M-type phospholipase A(2) receptor (PLA(2)R). Reactive serum specimens recognized recombinant PLA(2)R and bound the same 185-kD glomerular protein as did the monospecific anti-PLA(2)R antibody. Anti-PLA(2)R autoantibodies in serum samples from patients with membranous nephropathy were mainly IgG4, the predominant immunoglobulin subclass in glomerular deposits. PLA(2)R was expressed in podocytes in normal human glomeruli and colocalized with IgG4 in immune deposits in glomeruli of patients with membranous nephropathy. IgG eluted from such deposits in patients with idiopathic membranous nephropathy, but not in those with lupus membranous or IgA nephropathy, recognized PLA(2)R. A majority of patients with idiopathic membranous nephropathy have antibodies against a conformation-dependent epitope in PLA(2)R. PLA(2)R is present in normal podocytes and in immune deposits in patients with idiopathic membranous nephropathy, indicating that PLA(2)R is a major antigen in this disease. 2009 Massachusetts Medical Society
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                Author and article information

                Journal
                Journal ID (nlm-ta): Int J Mol Sci
                Journal ID (iso-abbrev): Int J Mol Sci
                Journal ID (publisher-id): ijms
                Title: International Journal of Molecular Sciences
                Publisher: MDPI
                ISSN (Electronic): 1422-0067
                Publication date (Electronic): 23 December 2020
                Publication date Collection: January 2021
                Volume: 22
                Issue: 1
                Electronic Location Identifier: 88
                Affiliations
                Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8558, Japan; gmd422036@ 123456s.okayama-u.ac.jp (K.T.); junwada@ 123456okayama-u.ac.jp (J.W.)
                Author notes
                [* ]Correspondence: kitamura@ 123456okayama-u.ac.jp ; Tel.: +81-86-235-7235; Fax: +81-86-222-5214
                Author information
                https://orcid.org/0000-0001-5442-7008
                https://orcid.org/0000-0003-4535-8092
                Article
                Publisher ID: ijms-22-00088
                DOI: 10.3390/ijms22010088
                PMC ID: 7795691
                PubMed ID: 33374848
                SO-VID: c777bcbf-75fd-4ea5-bde9-60f496de5f0d
                Copyright © © 2020 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 14 November 2020
                Date accepted : 22 December 2020
                Categories
                Subject: Review

                ScienceOpen disciplines: Molecular biology
                Keywords: microrna,nephrotic syndrome,biomarker,minimal change nephrotic syndrome,focal segmental glomerulosclerosis,membranous glomerulonephropathy
                Data availability:
                ScienceOpen disciplines: Molecular biology
                Keywords: microrna, nephrotic syndrome, biomarker, minimal change nephrotic syndrome, focal segmental glomerulosclerosis, membranous glomerulonephropathy

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