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Nel I, Münch C, Shamkeeva S, Heinemann ML, Isermann B, Aktas B. The Challenge to Stabilize, Extract and Analyze Urinary Cell-Free DNA (ucfDNA) during Clinical Routine. Diagnostics (Basel) 2023; 13:3670. [PMID: 38132253 PMCID: PMC10743081 DOI: 10.3390/diagnostics13243670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 12/07/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
BACKGROUND The "Liquid Biopsy" has become a powerful tool for cancer research during the last decade. Circulating cell-free DNA (cfDNA) that originates from tumors has emerged as one of the most promising analytes. In contrast to plasma-derived cfDNA, only a few studies have investigated urinary cfDNA. One reason might be rapid degradation and hence inadequate concentrations for downstream analysis. In this study, we examined the stability of cfDNA in urine using different methods of preservation under various storage conditions. METHODOLOGY To mimic patient samples, a pool of healthy male and female urine donors was spiked with a synthetic cfDNA reference standard (fragment size 170 bp) containing the T790M mutation in the EGFR gene. Spiked samples were preserved with three different buffers and with no buffer over four different storage periods (0 h; 4 h; 12 h; 24 h) at room temperature vs. 4 °C. The preservatives used were Urinary Analyte Stabilizer (UAS, Novosanis, Wijnegem, Belgium), Urine Conditioning Buffer (UCB, Zymo, Freiburg, Germany) and a self-prepared buffer called "AlloU". CfDNA was extracted using the QIAamp MinElute ccfDNA Mini Kit (Qiagen, Hilden, Germany). CfDNA concentration was measured using the Qubit™ 4 fluorometer (Thermo Fisher Scientific, Waltham, MA, USA). Droplet digital PCR (ddPCR) was used for detection and quantification of the T790M mutation. RESULTS Almost no spiked cfDNA was recoverable from samples with no preservation buffer and the T790M variant was not detectable in these samples. These findings indicate that cfDNA was degraded below the detection limit by urinary nucleases. Stabilizing buffers showed varying efficiency in preventing this degradation. The most effective stabilizing buffer under all storage conditions was the UAS, enabling adequate recovery of the T790M variant using ddPCR. CONCLUSION From a technical point of view, stabilizing buffers and adequate storage conditions are a prerequisite for translation of urinary cfDNA diagnostics into clinical routine.
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Affiliation(s)
- Ivonne Nel
- Department of Gynecology, Medical Center, University of Leipzig, 04103 Leipzig, Germany
| | - Carolin Münch
- Institute of Biochemistry, Medical Faculty, University of Leipzig, 04103 Leipzig, Germany
| | - Saikal Shamkeeva
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University Hospital, 04103 Leipzig, Germany
| | - Mitja L. Heinemann
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University Hospital, 04103 Leipzig, Germany
| | - Berend Isermann
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University Hospital, 04103 Leipzig, Germany
| | - Bahriye Aktas
- Department of Gynecology, Medical Center, University of Leipzig, 04103 Leipzig, Germany
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Münch C, Shamkeeva S, Heinemann M, Isermann B, Kasimir-Bauer S, Aktas B, Nel I. Abstract 6693: Stability of urinary cell-free DNA and detection of T790M variant. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-6693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
Abstract
Background: The so-called “liquid biopsy” has become a powerful tool for cancer research in the recent years, with circulating cell-free DNA (cfDNA) that originates from tumors as one of the most promising analytes. In contrast to plasma derived cfDNA, only a few studies were performed investigating urinary cfDNA. One reason might be quick degradation and hence relatively low concentrations of urinary cfDNA. This study focused on examining the stability of cfDNA in urine using different ways of preservation under various storage conditions.
Methodology: To mimic patient samples, a pool of healthy male and female urine donors was spiked with a synthetic cfDNA reference standard (fragment size 170 bp) containing the T790M mutation in the EGFR gene and preserved with three different buffers and no buffer over four different storage periods (0; 4; 12; 24 h) at room temperature vs. fridge. Preservatives used were the Urinary Analyte Stabilizer (UAS, Novosanis), the Urine Conditioning Buffer (UCB, Zymo) and a self-prepared buffer called “AlloU”. The cfDNA was extracted with the QIAamp MinElute ccfDNA Mini Kit (Qiagen) and the concentration measured with the Qubit™ 4 fluorometer (Thermo Fisher Scientific). Droplet digital PCR (ddPCR) was used for detection and quantification of the T790M mutation (Bio-Rad)
Results: From the model samples with no preservation buffer, almost no spiked cfDNA could be recovered and the T790M variant could not be detected using ddPCR, indicating that without preservation cfDNA was degraded below the detection limit by the nucleases present in urine. The most effective stabilizing buffer over all storage periods and at room as well as fridge temperature was the UAS, resulting in accurate detection of the T790M variant using ddPCR.
Conclusion: From a technical point of view, urinary cfDNA might be useful for non-invasive disease monitoring when the samples are stabilized and stored adequately during clinical routine.
Citation Format: Carolin Münch, Saikal Shamkeeva, Mitja Heinemann, Berend Isermann, Sabine Kasimir-Bauer, Bahriye Aktas, Ivonne Nel. Stability of urinary cell-free DNA and detection of T790M variant. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 6693.
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Affiliation(s)
| | | | | | | | | | | | - Ivonne Nel
- 1University of Leipzig, Leipzig, Germany
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Akhatova A, Azizan A, Atageldiyeva K, Ashimkhanova A, Marat A, Iztleuov Y, Suleimenova A, Shamkeeva S, Aimagambetova G. Prophylactic Human Papillomavirus Vaccination: From the Origin to the Current State. Vaccines (Basel) 2022; 10:1912. [PMID: 36423008 PMCID: PMC9696339 DOI: 10.3390/vaccines10111912] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/09/2022] [Accepted: 11/09/2022] [Indexed: 07/30/2023] Open
Abstract
Immunization is the most successful method in preventing and controlling infectious diseases, which has helped saving millions of lives worldwide. The discovery of the human papillomavirus (HPV) infection being associated with a variety of benign conditions and cancers has driven the development of prophylactic HPV vaccines. Currently, four HPV vaccines are available on the pharmaceutical market: Cervarix, Gardasil, Gardasil-9, and the recently developed Cecolin. Multiple studies have proven the HPV vaccines' safety and efficacy in preventing HPV-related diseases. Since 2006, when the first HPV vaccine was approved, more than 100 World Health Organization member countries reported the implementation of HPV immunization. However, HPV vaccination dread, concerns about its safety, and associated adverse outcomes have a significant impact on the HPV vaccine implementation campaigns all over the world. Many developed countries have successfully implemented HPV immunization and achieved tremendous progress in preventing HPV-related conditions. However, there are still many countries worldwide which have not created, or have not yet implemented, HPV vaccination campaigns, or have failed due to deficient realization plans associated with establishing successful HPV vaccination programs. Lack of proper HPV information campaigns, negative media reflection, and numerous myths and fake information have led to HPV vaccine rejection in many states. Thus, context-specific health educational interventions on HPV vaccination safety, effectiveness, and benefits are important to increase the vaccines' acceptance for efficacious prevention of HPV-associated conditions.
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Affiliation(s)
- Ayazhan Akhatova
- School of Medicine, Nazarbayev University, Astana 010000, Kazakhstan
| | - Azliyati Azizan
- Department of Basic Sciences, College of Osteopathic Medicine, Touro University, Henderson, NV 89014, USA
| | - Kuralay Atageldiyeva
- Department of Medicine, School of Medicine, Nazarbayev University, Astana 010000, Kazakhstan
- Clinical Academic Department of Internal Medicine, CF University Medical Center, Astana 10000, Kazakhstan
| | - Aiymkul Ashimkhanova
- Department of Medicine, School of Medicine, Nazarbayev University, Astana 010000, Kazakhstan
| | - Aizada Marat
- Department of Obstetrics and Gynecology #1, NJSC “Astana Medical University”, Astana 010000, Kazakhstan
| | - Yerbolat Iztleuov
- Medical Center, Marat Ospanov West-Kazakhstan Medical University, Aktobe 030000, Kazakhstan
| | - Assem Suleimenova
- Kazakh Institute of Oncology and Radiology, Almaty 050000, Kazakhstan
| | - Saikal Shamkeeva
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University Hospital, 04103 Leipzig, Germany
| | - Gulzhanat Aimagambetova
- Department of Biomedical Sciences, School of Medicine, Nazarbayev University, Astana 010000, Kazakhstan
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Reinicke M, Shamkeeva S, Hell M, Isermann B, Ceglarek U, Heinemann ML. Targeted Lipidomics for Characterization of PUFAs and Eicosanoids in Extracellular Vesicles. Nutrients 2022; 14:nu14071319. [PMID: 35405932 PMCID: PMC9000901 DOI: 10.3390/nu14071319] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/16/2022] [Accepted: 03/19/2022] [Indexed: 02/06/2023] Open
Abstract
Lipids are increasingly recognized as bioactive mediators of extracellular vesicle (EV) functions. However, while EV proteins and nucleic acids are well described, EV lipids are insufficiently understood due to lack of adequate quantitative methods. We adapted an established targeted and quantitative mass spectrometry (LC-MS/MS) method originally developed for analysis of 94 eicosanoids and seven polyunsaturated fatty acids (PUFA) in human plasma. Additionally, the influence of freeze–thaw (FT) cycles, injection volume, and extraction solvent were investigated. The modified protocol was applied to lipidomic analysis of differently polarized macrophage-derived EVs. We successfully quantified three PUFAs and eight eicosanoids within EVs. Lipid extraction showed reproducible PUFA and eicosanoid patterns. We found a particularly high impact of FT cycles on EV lipid profiles, with significant reductions of up to 70%. Thus, repeated FT will markedly influence analytical results and may alter EV functions, emphasizing the importance of a standardized sample pretreatment protocol for the analysis of bioactive lipids in EVs. EV lipid profiles differed largely depending on the polarization of the originating macrophages. Particularly, we observed major changes in the arachidonic acid pathway. We emphasize the importance of a standardized sample pretreatment protocol for the analysis of bioactive lipids in EVs.
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Abdukhakimova D, Markhametova Z, Shamkeeva S, Zhulamanova A, Trenozhnikova L, Berezin V, Azizan A. Characterizationharacterization of Extremophilic Actinomycetes Strains as Sources of Antimicrobial Agents. Methods Mol Biol 2021; 2296:59-75. [PMID: 33977442 DOI: 10.1007/978-1-0716-1358-0_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Extremophilic actinomycetes strains can survive extreme saline and alkaline environments and produce antimicrobial agents. In this chapter, we discuss laboratory methods that can be used to isolate and characterize actinomycetes strains capable of potentially producing novel antimicrobial agent(s) when cultured in conditions that mimic the environments from which they were isolated. Methods used to screen for antibacterial and antiviral activities from these producer strains, and microbiological and molecular approaches used to identify these strains are described. Here we describe three methods. Method 1 focuses on the strategy to select optimal conditions to synthesize and accumulate the antibiotics from the studied actinomycetes strains by preparing crude extracts. In Method 2, we describe the screening strategies used to test the actinomycetes strains against gram-negative and gram-positive bacteria, antifungal agents, multidrug-resistant pathogens (MDR), and viral pathogens. Thus, the specific techniques to test for MDR pathogens such as the disk diffusion assay and wells assay are outlined. We also describe the antiviral activity screening of the selected actinomycetes extracts in Method 2 of this chapter. Specifically, we concentrate on methods used to test for antiviral activities such as primary hemolytic, hemagglutination, neuraminidase, and specific virus-inhibitory activities. Finally, the Method 3 section reveals the microbiological techniques used to morphologically characterize the actinomycetes strains that depend on the culture medium utilized for growth. Additionally, the method used to perform a detailed characterization of the morphology that actinomycetes strains possess is specified by the protocol for sample preparation and visualization using the scanning electron microscopy (SEM). Finally, we summarize the molecular approaches used to characterize actinomycetes strains, focusing specifically on the PCR and sequencing techniques.
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Affiliation(s)
| | | | - Saikal Shamkeeva
- Nazarbayev University School of Medicine (NUSOM), Nur-Sultan, Kazakhstan
| | - Ainur Zhulamanova
- Nazarbayev University School of Medicine (NUSOM), Nur-Sultan, Kazakhstan
| | - Lyudmila Trenozhnikova
- Research and Production Center for Microbiology and Virology (RPCMV), Almaty, Kazakhstan
| | - Vladimir Berezin
- Research and Production Center for Microbiology and Virology (RPCMV), Almaty, Kazakhstan
| | - Azliyati Azizan
- Nazarbayev University School of Medicine (NUSOM), Nur-Sultan, Kazakhstan.
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Zhulamanova A, Koshenov Z, Shamkeeva S, Markhametova Z, Abdukhakimova D, Trenozhnikova L, Azizan A. Extremophilic actinomycetes isolated from soil in Kazakhstan: Classification and antimicrobial activities. Microbiol Res (Pavia) 2020. [DOI: 10.4081/mr.2020.8356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Extremophilic actinomycetes species are capable of surviving in extreme environment and producing antibiotics. In this study, we hypothesize that extremophiles produce antimicrobial compounds that are potentially novel agent(s) effective against drug resistant pathogens. The goal of this study is to test inhibitory activity of the extracts derived from extremophilic actinomycetes species against the most prevalent drug-resistant bacteria in Kazakhstani hospitals, and preliminarily analyze chemical composition of the active extracts. Actinomycetes species isolated from the soil of Kazakhstan were cultured in modified media mimicking extreme environment the species were isolated from. Antimicrobial compound(s) extracted with organic solvent were tested against conditionally pathogenic and multi-drug resistant pathogens Acinetobacter baumanni and Pseudomonas aeruginosa. Our study generated promising results regarding the potential discovery of novel components effective against drug resistant pathogens. Future studies will focus on further chemical analysis to identify the active component within these extremophilic extracts.
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Ong GH, Ho XH, Shamkeeva S, Manasha Savithri Fernando AS, Wong LS. Biosorption study of potential fungi for copper remediation from Peninsular Malaysia. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/rem.21531] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ghim Hock Ong
- Faculty of Health and Life Sciences, INTI International University; Malaysia
| | - Xin Han Ho
- Faculty of Health and Life Sciences, INTI International University; Malaysia
| | - Saikal Shamkeeva
- Faculty of Health and Life Sciences, INTI International University; Malaysia
| | | | - Ling Shing Wong
- Faculty of Health and Life Sciences, INTI International University; Malaysia
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