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Russo M, Camillo MRT, La Tella R, Rigano F, Donato P, Mondello L, Dugo P. Principles and applications of porous graphitic carbon stationary phase in liquid chromatography: An update. J Chromatogr A 2024; 1719:464728. [PMID: 38402696 DOI: 10.1016/j.chroma.2024.464728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/08/2024] [Accepted: 02/09/2024] [Indexed: 02/27/2024]
Abstract
The introduction of carbon black particles as packaging material for liquid chromatography columns dates back to the late 70's, in an attempt to overcome common drawbacks associated with silica-based packings. The latter consisted of the difficulty in eliminating or shielding the polar residual silanol groups, responsible for secondary interactions with non-polar ligands, but also the fragility and instability of the bonded ligands. Since then, numerous advances have been made in the synthesis of carbon-based stationary phases, achieving excellent objectives in terms of chromatographic performance and versatility, mainly related to the possibility of working under a wide range of pH (1-14) and temperature (higher than 200 °C). The purpose of this review is to summarize the most significant advances in the synthesis and application of the porous graphitic carbon phase (PGC), in the last decade. Literature reports based on the use of PGC columns are focused on the analysis of a wide range of chemicals, spanning from polar compounds to apolar polymers. More in detail, polar analytes have included both small molecules and larger biomolecules (such as oligo- and polysaccharides, peptides, and glycopeptides), with special emphasis on additional selectivity for isomer separation. On the other hand, applications devoted to the analysis of non-polar analytes could benefit from the use of high temperatures, allowing for the achievement of satisfactory separations within reduced analysis time.
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Affiliation(s)
- Marina Russo
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
| | - Maria Rita Testa Camillo
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
| | - Roberta La Tella
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
| | - Francesca Rigano
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy.
| | - Paola Donato
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
| | - Luigi Mondello
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy; Chromaleont s.r.l., c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
| | - Paola Dugo
- Messina Institute of Technology c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy; Chromaleont s.r.l., c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, former Veterinary School, University of Messina, Viale G. Palatucci Snc, Messina 98168, Italy
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Richani D, Poljak A, Wang B, Mahbub SB, Biazik J, Campbell JM, Habibalahi A, Stocker WA, Marinova MB, Nixon B, Bustamante S, Skerrett-Byrne D, Harrison CA, Goldys E, Gilchrist RB. Oocyte and cumulus cell cooperativity and metabolic plasticity under the direction of oocyte paracrine factors. Am J Physiol Endocrinol Metab 2024; 326:E366-E381. [PMID: 38197792 DOI: 10.1152/ajpendo.00148.2023] [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: 05/15/2023] [Revised: 12/12/2023] [Accepted: 12/12/2023] [Indexed: 01/11/2024]
Abstract
Mammalian oocytes develop and mature in a mutually dependent relationship with surrounding cumulus cells. The oocyte actively regulates cumulus cell differentiation and function by secreting soluble paracrine oocyte-secreted factors (OSFs). We characterized the molecular mechanisms by which two model OSFs, cumulin and BMP15, regulate oocyte maturation and cumulus-oocyte cooperativity. Exposure to these OSFs during mouse oocyte maturation in vitro altered the proteomic and multispectral autofluorescence profiles of both the oocyte and cumulus cells. In oocytes, cumulin significantly upregulated proteins involved in nuclear function. In cumulus cells, both OSFs elicited marked upregulation of a variety of metabolic processes (mostly anabolic), including lipid, nucleotide, and carbohydrate metabolism, whereas mitochondrial metabolic processes were downregulated. The mitochondrial changes were validated by functional assays confirming altered mitochondrial morphology, respiration, and content while maintaining ATP homeostasis. Collectively, these data demonstrate that cumulin and BMP15 remodel cumulus cell metabolism, instructing them to upregulate their anabolic metabolic processes, while routine cellular functions are minimized in the oocyte during maturation, in preparation for ensuing embryonic development.NEW & NOTEWORTHY Oocyte-secreted factors (OSFs) promote oocyte and cumulus cell cooperativity by altering the molecular composition of both cell types. OSFs downregulate protein catabolic processes and upregulate processes associated with DNA binding, translation, and ribosome assembly in oocytes. In cumulus cells, OSFs alter mitochondrial number, morphology, and function, and enhance metabolic plasticity by upregulating anabolic pathways. Hence, the oocyte via OSFs, instructs cumulus cells to increase metabolic processes on its behalf, thereby subduing oocyte metabolism.
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Affiliation(s)
- Dulama Richani
- Fertility & Research Centre, Discipline of Women's Health, School of Clinical Medicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Anne Poljak
- Bioanalytical Mass Spectrometry Facility, Mark Wainwright Analytical Centre, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Baily Wang
- Fertility & Research Centre, Discipline of Women's Health, School of Clinical Medicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Saabah B Mahbub
- ARC Centre of Excellence Centre for Nanoscale Biophotonics, Graduate School of Biomedical Engineering, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Joanna Biazik
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Jared M Campbell
- ARC Centre of Excellence Centre for Nanoscale Biophotonics, Graduate School of Biomedical Engineering, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Abbas Habibalahi
- ARC Centre of Excellence Centre for Nanoscale Biophotonics, Graduate School of Biomedical Engineering, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - William A Stocker
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Maria B Marinova
- Fertility & Research Centre, Discipline of Women's Health, School of Clinical Medicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Brett Nixon
- Priority Research Centre for Reproductive Science, School of Environmental and Life Sciences, College of Engineering, Science and Environment, The University of Newcastle, Newcastle, New South Wales, Australia
| | - Sonia Bustamante
- Bioanalytical Mass Spectrometry Facility, Mark Wainwright Analytical Centre, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - David Skerrett-Byrne
- Priority Research Centre for Reproductive Science, School of Environmental and Life Sciences, College of Engineering, Science and Environment, The University of Newcastle, Newcastle, New South Wales, Australia
| | - Craig A Harrison
- Department of Physiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Ewa Goldys
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales Sydney, Sydney, New South Wales, Australia
| | - Robert B Gilchrist
- Fertility & Research Centre, Discipline of Women's Health, School of Clinical Medicine, University of New South Wales Sydney, Sydney, New South Wales, Australia
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Deng L, Kumar J, Rose R, McIntyre W, Fabris D. Analyzing RNA posttranscriptional modifications to decipher the epitranscriptomic code. MASS SPECTROMETRY REVIEWS 2024; 43:5-38. [PMID: 36052666 DOI: 10.1002/mas.21798] [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: 02/14/2022] [Revised: 05/23/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
The discovery of RNA silencing has revealed that non-protein-coding sequences (ncRNAs) can cover essential roles in regulatory networks and their malfunction may result in severe consequences on human health. These findings have prompted a general reassessment of the significance of RNA as a key player in cellular processes. This reassessment, however, will not be complete without a greater understanding of the distribution and function of the over 170 variants of the canonical ribonucleotides, which contribute to the breathtaking structural diversity of natural RNA. This review surveys the analytical approaches employed for the identification, characterization, and detection of RNA posttranscriptional modifications (rPTMs). The merits of analyzing individual units after exhaustive hydrolysis of the initial biopolymer are outlined together with those of identifying their position in the sequence of parent strands. Approaches based on next generation sequencing and mass spectrometry technologies are covered in depth to provide a comprehensive view of their respective merits. Deciphering the epitranscriptomic code will require not only mapping the location of rPTMs in the various classes of RNAs, but also assessing the variations of expression levels under different experimental conditions. The fact that no individual platform is currently capable of meeting all such demands implies that it will be essential to capitalize on complementary approaches to obtain the desired information. For this reason, the review strived to cover the broadest possible range of techniques to provide readers with the fundamental elements necessary to make informed choices and design the most effective possible strategy to accomplish the task at hand.
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Affiliation(s)
- L Deng
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
| | - J Kumar
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
| | - R Rose
- Department of Advanced Research Technologies, New York University Langone Health Center, New York, USA
| | - W McIntyre
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
| | - Daniele Fabris
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
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Banni GAHD, Nehmé R. Capillary electrophoresis for enzyme-based studies: Applications to lipases and kinases. J Chromatogr A 2021; 1661:462687. [PMID: 34864234 DOI: 10.1016/j.chroma.2021.462687] [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: 04/14/2021] [Revised: 11/05/2021] [Accepted: 11/14/2021] [Indexed: 10/19/2022]
Abstract
Capillary electrophoresis (CE) is a powerful technique continuously expanding into new application fields. One of these applications involves the study of enzymes, their catalytic activities and the alteration of this activity by specific ligands. In this review, two model enzymes, lipases and kinases, will be used since they differ substantially in their modes of action, reaction requirements and applications making them perfect subjects to demonstrate the advantages and limitations of CE-based enzymatic assays. Indeed, the ability to run CE in various operation modes and hyphenation to different detectors is essential for lipase-based studies. Additionally, the low sample consumption provided by CE promotes it as a promising technique to assay human and viral nucleoside kinases. Undeniably, these are rarely commercially available enzymes and must be frequently produced in the laboratory, a process which requires special sets of skills. CE-based lipase and kinase reactions can be performed outside the capillary (pre-capillary) where the reactants are mixed in a vial prior to their separation or, inside the capillary (in-capillary) where the reactants are mixed before the electrophoretic analysis. These enzyme-based applications of CE will be compared to those of liquid chromatography-based applications in terms of advantages and limitations. Binding assays based on affinity CE and the compelling microscale thermophoresis (MST) will be briefly presented as they allow a broad understanding of the molecular mechanism behind ligand binding and of the resulting modulation in activity.
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Affiliation(s)
- Ghassan Al Hamoui Dit Banni
- Institut de Chimie Organique et Analytique (ICOA), CNRS FR 2708 - UMR 7311, Université d'Orléans, Orléans 45067, France
| | - Reine Nehmé
- Institut de Chimie Organique et Analytique (ICOA), CNRS FR 2708 - UMR 7311, Université d'Orléans, Orléans 45067, France.
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Wei-Qi K, Yuan Z, Yu Z, Xue-Song F. An Overview of Pretreatment and Analysis of Nucleotides in Different Samples (Update since 2010). Crit Rev Anal Chem 2021; 52:1624-1643. [PMID: 33840326 DOI: 10.1080/10408347.2021.1907173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Nucleotides, which are important low-molecular-weight compounds present in organisms, are precursors of nucleic acids and participate in various regulatory and metabolic functions. Sensitive and valid methods for monitoring and determining nucleotides and nucleosides in different samples are urgently required. Due to the presence of numerous endogenous interferences in complex matrices and the high polarity of the molecules of the phosphate moiety, the determination of nucleotide content is challenging. This review summarizes the pretreatment and analysis methods of nucleotides in different samples. Advanced pretreatment methods, including different microextraction methods, solid-phase extraction based on novel materials, QuEChERS, are clearly displayed, and continuous progress which has been made in LC, LC-MS/MS and capillary electrophoresis methods are discussed. Moreover, the strengths and weaknesses of different methods are discussed and compared. Highlight:Advanced pretreatment and detection methods of nucleotides were critically reviewed.Microextraction technology was one of the trends of nucleotides pretreatment in the future.Applications of novel materials and supercritical fluid were highlighted.The evolution and advance of HRMS analyzers were in detailed.
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Affiliation(s)
- Kang Wei-Qi
- School of Pharmacy, China Medical University, Shenyang, China
| | - Zhang Yuan
- School of Pharmacy, China Medical University, Shenyang, China
| | - Zhou Yu
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Feng Xue-Song
- School of Pharmacy, China Medical University, Shenyang, China
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Li H, Uittenbogaard M, Hao L, Chiaramello A. Clinical Insights into Mitochondrial Neurodevelopmental and Neurodegenerative Disorders: Their Biosignatures from Mass Spectrometry-Based Metabolomics. Metabolites 2021; 11:233. [PMID: 33920115 PMCID: PMC8070181 DOI: 10.3390/metabo11040233] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 04/01/2021] [Accepted: 04/07/2021] [Indexed: 02/07/2023] Open
Abstract
Mitochondria are dynamic multitask organelles that function as hubs for many metabolic pathways. They produce most ATP via the oxidative phosphorylation pathway, a critical pathway that the brain relies on its energy need associated with its numerous functions, such as synaptic homeostasis and plasticity. Therefore, mitochondrial dysfunction is a prevalent pathological hallmark of many neurodevelopmental and neurodegenerative disorders resulting in altered neurometabolic coupling. With the advent of mass spectrometry (MS) technology, MS-based metabolomics provides an emerging mechanistic understanding of their global and dynamic metabolic signatures. In this review, we discuss the pathogenetic causes of mitochondrial metabolic disorders and the recent MS-based metabolomic advances on their metabolomic remodeling. We conclude by exploring the MS-based metabolomic functional insights into their biosignatures to improve diagnostic platforms, stratify patients, and design novel targeted therapeutic strategies.
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Affiliation(s)
- Haorong Li
- Department of Chemistry, George Washington University, Science and Engineering Hall 4000, 800 22nd St., NW, Washington, DC 20052, USA;
| | - Martine Uittenbogaard
- Department of Anatomy and Cell Biology, School of Medicine and Health Sciences, George Washington University, 2300 I Street N.W. Ross Hall 111, Washington, DC 20037, USA;
| | - Ling Hao
- Department of Chemistry, George Washington University, Science and Engineering Hall 4000, 800 22nd St., NW, Washington, DC 20052, USA;
| | - Anne Chiaramello
- Department of Anatomy and Cell Biology, School of Medicine and Health Sciences, George Washington University, 2300 I Street N.W. Ross Hall 111, Washington, DC 20037, USA;
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Tsjokajev A, Røberg-Larsen H, Wilson SR, Dyve Lingelem AB, Skotland T, Sandvig K, Lundanes E. Mass spectrometry-based measurements of cyclic adenosine monophosphate in cells, simplified using reversed phase liquid chromatography with a polar characterized stationary phase. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1160:122384. [PMID: 32971370 DOI: 10.1016/j.jchromb.2020.122384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 09/01/2020] [Accepted: 09/08/2020] [Indexed: 10/23/2022]
Abstract
3', 5' - Cyclic adenosine monophosphate (cAMP) is a ubiquitous second messenger that is involved in many cellular functions and biological processes. In several cell types, cholera toxin will increase the level of cAMP, which mediates toxic effects on cells. In this context, we have developed a fast and simple method based on extraction with 5% trichloroacetic acid (TCA) and quantitation with liquid chromatography-mass tandem spectrometry (LC-MS/MS) for measuring cAMP in cells. A main feature of the LC-MS method was employing a reversed phase C18 column (2.1 mm × 50 mm, 1.6 µm particles) compatible with a 100% aqueous mobile phase, providing retention of the highly polar analyte. Isocratic separations allowed for fast subsequent injections. Negative mode electrospray ionization detection was performed with a triple quadrupole (QqQ)MS. cAMP was extracted from cell samples (~106 cells per well) and spiked with a labelled internal standard, using 200 µL of 5% TCA. The extraction solvent was fully compatible for direct injection onto the reversed phase column. After 10 min incubation, the supernatant was removed, and 10 µL of the supernatant was directly analysed by LC-MS. The method was characterized by the simplicity of the extraction, and the speed (3 min retention time of cAMP), sensitivity (250 pg/mL detection limit), and selectivity (separation from interferences e.g. isomeric compounds) of the LC-MS method, and could be used for quantitation of cAMP in the range 1-500 ng/mL cell extract.
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Affiliation(s)
- Ahmad Tsjokajev
- Department of Chemistry, University of Oslo, Post Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Hanne Røberg-Larsen
- Department of Chemistry, University of Oslo, Post Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Steven Ray Wilson
- Department of Chemistry, University of Oslo, Post Box 1033, Blindern, NO-0315 Oslo, Norway; Hybrid Technology Hub-Centre of Excellence, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway.
| | - Anne-Berit Dyve Lingelem
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital - The Norwegian Radium Hospital, Oslo, Norway
| | - Tore Skotland
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital - The Norwegian Radium Hospital, Oslo, Norway
| | - Kirsten Sandvig
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital - The Norwegian Radium Hospital, Oslo, Norway; Department of Biosciences, University of Oslo, Oslo, Norway
| | - Elsa Lundanes
- Department of Chemistry, University of Oslo, Post Box 1033, Blindern, NO-0315 Oslo, Norway
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Feng JH, Wei KZ, Gao JP, Xu X. Determination of adenosine phosphates in mouse myocardium tissue by HPLC with UV detection and using porous graphite carbon column. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1145:122110. [PMID: 32315974 DOI: 10.1016/j.jchromb.2020.122110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 04/06/2020] [Accepted: 04/09/2020] [Indexed: 10/24/2022]
Abstract
A high-performance liquid chromatography (HPLC) method with UV detection was established and validated for the simultaneous determination of adenosine triphosphate (ATP), adenosine diphosphate (ADP) and adenosine monophosphate (AMP) in mouse myocardial tissues. After protein precipitation and compound extraction with pre-cooled perchloric acid and the supernatant was centrifuged with the pH value adjusted to 6.5-7.5, the analytes were separated on a porous graphitic carbon LC column (4.6 mm × 100 mm, 5 μm) using gradient elution with a mobile phase of 10 mmol/L borax solution, pH 9.18(A) and acetonitrile-tetrahydrofuran (1:1, v/v) (B). The LC flow rate was 0.8 mL/min; the UV detection wavelength was 254 nm and the column temperature was maintained at 35 °C. ATP, ADP, and AMP were separated and the intra-day relative standard deviations (RSDs) of peak area repeatability were 1.3-2.5% (n = 6). The correlation coefficients of the linearity between UV responses and adenosine phosphate concentrations were larger than 0.9998 in all cases, within concentration ranges of 0.71-91.6 μg/mL for ATP, 1.3-81.5 μg/mL for ADP and 1.69-108.1 μg/mL for AMP. The limits of detection were within 0.17-0.21 μg/mL. The average standard substance spiked-in recoveries were 93.6-104.7% (n = 3). The established HPLC method was successfully applied to quantitate ATP, ADP, and AMP in mouse myocardial tissues.
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Affiliation(s)
- Jia-Hua Feng
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Ke-Zhao Wei
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Jian-Ping Gao
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Xu Xu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
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Participation of the adenosine salvage pathway and cyclic AMP modulation in oocyte energy metabolism. Sci Rep 2019; 9:18395. [PMID: 31804531 PMCID: PMC6895058 DOI: 10.1038/s41598-019-54693-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 11/18/2019] [Indexed: 12/27/2022] Open
Abstract
A follicular spike in cyclic AMP (cAMP) and its subsequent degradation to AMP promotes oocyte maturation and ovulation. In vitro matured (IVM) oocytes do not receive the cAMP increase that occurs in vivo, and artificial elevation of cAMP in IVM cumulus-oocyte complexes improves oocyte developmental potential. This study examined whether mouse oocytes can use the cAMP degradation product AMP to generate ATP via the adenosine salvage pathway, and examined whether pharmacological elevation of cAMP in IVM cumulus-oocyte complexes alters ATP levels. Oocytes cultured with isotopic 13C5-AMP dose-dependently produced 13C5-ATP, however total cellular ATP remained constant. Pharmacological elevation of cAMP using forskolin and IBMX prior to IVM decreased oocyte ATP and ATP:ADP ratio, and promoted activity of the energy regulator AMPK. Conversely, cumulus cells exhibited higher ATP and no change in AMPK. Culture of oocytes without their cumulus cells or inhibition of their gap-junctional communication yielded lower oocyte 13C5-ATP, indicating that cumulus cells facilitate ATP production via the adenosine salvage pathway. In conclusion, this study demonstrates that mouse oocytes can generate ATP from AMP via the adenosine salvage pathway, and cAMP elevation alters adenine nucleotide metabolism and may provide AMP for energy production via the adenosine salvage pathway during the energetically demanding process of meiotic maturation.
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Capacitation IVM improves cumulus function and oocyte quality in minimally stimulated mice. J Assist Reprod Genet 2019; 37:77-88. [PMID: 31667700 DOI: 10.1007/s10815-019-01610-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 10/04/2019] [Indexed: 12/27/2022] Open
Abstract
PURPOSE Oocyte in vitro maturation (IVM) is a patient-friendly reproductive technology but lower success rates than IVF have limited its uptake. Capacitation-IVM (CAPA-IVM) is an innovative new IVM system currently undergoing clinical evaluation. This study aimed to determine temporal effects of the pre-IVM phase of CAPA-IVM on cumulus function and oocyte developmental competence in mildly-stimulated mice. METHODS Immature cumulus oocyte complexes (COCs) derived from mildly stimulated (23 h PMSG) 28-day-old mice underwent pre-IVM for 0-24 h in medium containing c-type natriuretic peptide (CNP), E2, FSH and insulin, prior to IVM (CAPA-IVM). The effect of pre-IVM duration on cumulus cell function and embryo development post-CAPA-IVM/IVF was assessed. RESULTS Day 6 blastocyst rate increased incrementally with increasing pre-IVM duration: 40.6 ± 2.0%, 45.8 ± 1.2%, 52.2 ± 3.5%, 53.3 ± 5.9%, and 59.9 ± 2.5% for 0, 2, 6, 12, and 24 h pre-IVM, respectively (P < 0.01). DNA content/COC, a measure of cumulus cell proliferation, was significantly higher with 24 h pre-IVM group compared to 0, 2, or 6 h pre-IVM (P < 0.001). Pre-IVM for 24 h significantly increased cumulus expansion and mRNA expression of matrix genes Has2 and Tnfaip6 and Areg relative to no pre-IVM control (P < 0.01). Cumulus-oocyte gap-junctional communication (GJC) was maintained throughout 24 h pre-IVM (P < 0.0001), and GJC loss was slowed during the subsequent IVM phase, whilst meiotic resumption was accelerated (P < 0.05). Pre-IVM increased COC ATP and ADP content (P < 0.05), but not AMP, ATP/ADP, and energy charge. CONCLUSION The pre-IVM phase of CAPA-IVM improves the quality of IVM oocytes in a temporally dependent manner and significantly influences cumulus cell function including increased cell proliferation, cumulus expansion, and prolonged cumulus-oocyte GJC.
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Maciel EVS, de Toffoli AL, Neto ES, Nazario CED, Lanças FM. New materials in sample preparation: Recent advances and future trends. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.115633] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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