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Van Der Hofstadt M, Cardinal A, Lepeltier M, Boulestreau J, Ouedraogo A, Kahli M, Champigneux P, Molina L, Molina F, Van TNN. Assessment of salivary microRNA by RT-qPCR: Facing challenges in data interpretation for clinical diagnosis. PLoS One 2024; 19:e0314733. [PMID: 39656703 PMCID: PMC11630609 DOI: 10.1371/journal.pone.0314733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2024] [Accepted: 11/14/2024] [Indexed: 12/17/2024] Open
Abstract
Salivary microRNAs (miRNAs) have been recently revealed as the next generation of non-invasive biomarkers for the diagnostics of diverse diseases. However, their short and highly homologous sequences make their quantification by RT-qPCR technique highly heterogeneous and study dependent, thus limiting their implementation for clinical applications. In this study, we evaluated the use of a widely used commercial RT-qPCR kit for quantification of salivary miRNAs for clinical diagnostics. Saliva from ten healthy volunteers were sampled four times within a three month time course and submitted for small RNA extraction followed by RT-qPCR analysed. Six miRNAs with different sequence homologies were analysed. Sensitivity and specificity of the tested miRNA assays were corroborated using synthetic miRNAs to evaluate the reliability of all tested assays. Significant variabilities in expression profiles of six miRNAs from ten healthy participants were revealed, yet the poor specificity of the assays offered insufficient performance to associate these differences to biological context. Indeed, as the limit of quantification (LOQ) concentrations are from 2-4 logs higher than that of the limit of detection (LOD) ones, the majority of the analysis for salivary miRNAs felt outside the quantification region. Most importantly, a remarkable number of crosstalk reactions exhibiting considerable OFF target signal intensities was detected, indicating their poor specificity and limited reliability. However, the spike-in of synthetic target miRNA increased the capacity to discriminate endogenous salivary miRNA at the LOQ concentrations from those that were significantly lower. Our results demonstrate that comparative analyses for salivary miRNA expression profiles by this commercial RT-qPCR kit are most likely associated to technical limitations rather than to biological differences. While further technological breakthroughs are still required to overcome discrepancies, standardization of rigorous sample handling and experimental design according to technical parameters of each assay plays a crucial role in reducing data inconsistencies across studies.
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Affiliation(s)
| | - Anna Cardinal
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Morgane Lepeltier
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Jérémy Boulestreau
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Alimata Ouedraogo
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Malik Kahli
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Pierre Champigneux
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Laurence Molina
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Franck Molina
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
| | - Thi Nhu Ngoc Van
- Sys2Diag UMR9005 CNRS/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
- SkillCell/ALCEN, Cap Gamma, Parc Euromédecine, Montpellier, France
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Improta-Caria AC, Ferrari F, Gomes JLP, Villalta PB, Soci ÚPR, Stein R, Oliveira EM. Dysregulated microRNAs in type 2 diabetes and breast cancer: Potential associated molecular mechanisms. World J Diabetes 2024; 15:1187-1198. [PMID: 38983808 PMCID: PMC11229979 DOI: 10.4239/wjd.v15.i6.1187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/03/2024] [Accepted: 04/26/2024] [Indexed: 06/11/2024] Open
Abstract
Type 2 diabetes (T2D) is a multifaceted and heterogeneous syndrome associated with complications such as hypertension, coronary artery disease, and notably, breast cancer (BC). The connection between T2D and BC is established through processes that involve insulin resistance, inflammation and other factors. Despite this comprehension the specific cellular and molecular mechanisms linking T2D to BC, especially through microRNAs (miRNAs), remain elusive. miRNAs are regulators of gene expression at the post-transcriptional level and have the function of regulating target genes by modulating various signaling pathways and biological processes. However, the signaling pathways and biological processes regulated by miRNAs that are associated with T2D and BC have not yet been elucidated. This review aims to identify dysregulated miRNAs in both T2D and BC, exploring potential signaling pathways and biological processes that collectively contribute to the development of BC.
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Affiliation(s)
- Alex Cleber Improta-Caria
- Laboratory of Biochemistry and Molecular Biology of the Exercise, Physical Education and Sport School, University of São Paulo, São Paulo 05508-030, Brazil
| | - Filipe Ferrari
- Graduate Program in Cardiology and Cardiovascular Sciences, Federal University of Rio Grande do Sul, Hospital de Clínicas de Porto Alegre, Porto Alegre 90035003, Brazil
| | - João Lucas Penteado Gomes
- Laboratory of Biochemistry and Molecular Biology of the Exercise, Physical Education and Sport School, University of São Paulo, São Paulo 05508-030, Brazil
| | - Paloma Brasilio Villalta
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas-UNICAMP, Campinas 13484-350, Brazil
| | - Úrsula Paula Renó Soci
- Laboratory of Biochemistry and Molecular Biology of the Exercise, Physical Education and Sport School, University of São Paulo, São Paulo 05508-030, Brazil
| | - Ricardo Stein
- Graduate Program in Cardiology and Cardiovascular Sciences, Federal University of Rio Grande do Sul, Hospital de Clínicas de Porto Alegre, Porto Alegre 90035003, Brazil
| | - Edilamar M Oliveira
- Laboratory of Biochemistry and Molecular Biology of the Exercise, Physical Education and Sport School, University of São Paulo, São Paulo 05508-030, Brazil
- Departments of Internal Medicine, Molecular Pharmacology and Physiology, Center for Regenerative Medicine, USF Health Heart Institute, Morsani College of Medicine, University of South Florida, Tampa, FL 33602, United States
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Vogt S, Handke D, Behre HM, Greither T. Decreased Serum Levels of the Insulin Resistance-Related microRNA miR-320a in Patients with Polycystic Ovary Syndrome. Curr Issues Mol Biol 2024; 46:3379-3393. [PMID: 38666942 PMCID: PMC11049427 DOI: 10.3390/cimb46040212] [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: 03/07/2024] [Revised: 04/10/2024] [Accepted: 04/13/2024] [Indexed: 04/28/2024] Open
Abstract
Polycystic ovary syndrome (PCOS) is often associated with metabolic abnormalities in the affected patients such as obesity or a dysregulated glucose metabolism/insulin resistance (IR). IR affects the serum levels of several circulating microRNAs; however, studies on the association between IR-related microRNAs and PCOS are scarce. Therefore, we quantified the serum levels of the IR-associated microRNAs miR-93, miR-148a, miR-216a, miR-224 and miR-320a via qPCR in a cohort of 358 infertility patients, of whom 136 were diagnosed with PCOS. In bivariate correlation analyses, the serum levels of miR-93 and miR-216a were inversely associated with dipeptidyl peptidase 4 serum concentrations, and the miR-320a serum levels were significantly downregulated in PCOS patients (p = 0.02, Mann-Whitney U test). Interestingly, in all patients who achieved pregnancy after Assisted Reproductive Technology (ART) cycles, the serum levels of the five IR-associated microRNAs were significantly elevated compared to those of non-pregnant patients. In cell culture experiments, we detected a significant upregulation of miR-320a expression following testosterone stimulation over 24 and 48 h in KGN and COV434 granulosa carcinoma cells. In conclusion, we demonstrated a significantly reduced serum level of the IR-associated miR-320a in our patient cohort. This result once again demonstrates the close relationship between metabolic disorders and the dysregulation of microRNA expression patterns in PCOS.
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Affiliation(s)
| | | | | | - Thomas Greither
- Center for Reproductive Medicine and Andrology, Martin-Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120 Halle, Germany
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