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Gutierrez MJ, Nino G, Restrepo-Gualteros S, Mondell E, Chorvinsky E, Bhattacharya S, Bera BS, Welham A, Hong X, Wang X. Purine degradation pathway metabolites at birth and the risk of lower respiratory tract infections in infancy. ERJ Open Res 2024; 10:00693-2023. [PMID: 38410704 PMCID: PMC10895431 DOI: 10.1183/23120541.00693-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/28/2023] [Indexed: 02/28/2024] Open
Abstract
Background Lower respiratory tract infections (LRTIs) are the leading cause of infant morbidity and mortality worldwide, and altered metabolite production is recognised as a critical factor in LRTI pathogenesis. Methods This study aimed to identify prenatal metabolic changes associated with LRTI risk in infancy, using liquid chromatography-mass spectrometry unbiased metabolomics analysis on cord blood from 810 full-term newborns. Results We identified 22 compounds linked to LRTIs in infancy, enriched for purine degradation pathway (PDP) metabolites. High cord blood PDP metabolites, including xanthine, hypoxanthine, xanthosine and inosine, were linked to reduced LRTI risk during infancy. Notably, a low xanthine to uric acid ratio at birth predicted a four-fold increased LRTI risk. Conclusion This study is the first to reveal that high cord blood PDP metabolites identify newborns at lower LRTI risk, stratifying disease risk at birth. Moreover, our results prompt further study on PDP enzymes as pharmacological targets to decrease LRTI morbidity and mortality for at-risk newborns.
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Affiliation(s)
- Maria J Gutierrez
- Division of Pediatric Allergy, Immunology and Rheumatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- These authors contributed equally
| | - Gustavo Nino
- Division of Pulmonary and Sleep Medicine, Children's National Hospital, George Washington University, Washington, DC, USA
- Center for Genetic Medicine Research, Children's Research Institute, Washington, DC, USA
- These authors contributed equally
| | - Sonia Restrepo-Gualteros
- Department of Pediatrics, School of Medicine, Universidad Nacional de Colombia, Bogotá, Colombia
- Division of Pediatric Pulmonology, Fundación Hospital Pediátrico La Misericordia (HOMI), Bogotá, Colombia
| | - Ethan Mondell
- School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Elizabeth Chorvinsky
- Center for Genetic Medicine Research, Children's Research Institute, Washington, DC, USA
| | - Surajit Bhattacharya
- Center for Genetic Medicine Research, Children's Research Institute, Washington, DC, USA
| | - Bethlehem Solomon Bera
- Center for Genetic Medicine Research, Children's Research Institute, Washington, DC, USA
| | - Allison Welham
- Center for Genetic Medicine Research, Children's Research Institute, Washington, DC, USA
| | - Xiumei Hong
- Center on the Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Xiaobin Wang
- Center on the Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
- Division of General Pediatrics and Adolescent Medicine, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Yang XY, Li XZ, Zhang SN. Metabolomics analysis of oral mucosa reveals profile perturbation in reticular oral lichen planus. Clin Chim Acta 2018; 487:28-32. [PMID: 30218656 DOI: 10.1016/j.cca.2018.09.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/06/2018] [Accepted: 09/11/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND Oral lichen planus (OLP) is a chronic inflammatory mucosal disorder and potentially oral premalignant lesion affecting the stratified squamous epithelia. In OLP, reticular type is the most common clinical form of the disease. However, little is known about it. Metabolomics analysis may help to investigate the disease pathogenesis and to improve clinical treatment. METHODS Liquid chromatography (LC)-mass spectrometry (MS) system, XCMS software, SIMCA software, and OSI / SMMS software were integrated to identify differentially expressed metabolites for the pathways and pathology analysis. RESULTS Totally, 21 modulated metabolites were identified, whose dysregulations affected 30 metabolic pathways. Through an impact-value screen (impact-value>0.1), 8 pathways were selected as the significantly dysregulated pathways. Pathological network showed that these metabolites participated in 5 pathological processes, that is, inflammatory lesion, DNA damage and repair disorder, apoptosis process, oxidative stress injury, and abnormal energy expenditure. CONCLUSION The study revealed the metabolic perturbation of oral mucosa in reticular OLP, which may provide an important reference for the understanding of the pathogenesis of the disease and the discovery of therapeutic targets.
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Affiliation(s)
- Xu-Yan Yang
- First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin 150040, PR China
| | - Xu-Zhao Li
- Pharmacy School, Guiyang University of Chinese Medicine, Guiyang 550025, PR China.
| | - Shuai-Nan Zhang
- Pharmacy School, Guiyang University of Chinese Medicine, Guiyang 550025, PR China.
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Schlaeger EJ. The protein hydrolysate, Primatone RL, is a cost-effective multiple growth promoter of mammalian cell culture in serum-containing and serum-free media and displays anti-apoptosis properties. J Immunol Methods 1996; 194:191-9. [PMID: 8765172 DOI: 10.1016/0022-1759(96)00080-4] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The tryptic meat digest Primatone RL is a low-cost medium supplement of a complex nature which serves as a source of amino acids, oligopeptides, iron salts, some lipids and other trace low molecular weight substances. Its addition to mammalian and insect cell culture media significantly improves the cell growth properties of many cell lines. In this work the growth promoting effects of Primatone RL are described in more detail using different mouse hybridomas, a mouse myeloma cell line, and human promyelocytic leukemia HL-60 cells. The positive effects on cell growth induced by Primatone were observed in the presence of serum but were even more pronounced in serum-free culture. In addition the adaptation time from high serum to low (1%) or serum-free growth in the presence of Primatone is also significantly reduced. Primatone RL, when added to HL and DHI medium, improves cell growth under low serum or serum-free conditions by increasing the maximum cell numbers and in particular the viability of the culture. The observed decrease in cell death (apoptosis) induction leads to a significant improvement in antibody (recombinant protein) production by increasing the volumetric yields during long-term batch culture. The so-called anti-apoptotic effects of Primatone RL for mouse hybridomas, which is concentration dependent, is not fully understood.
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Affiliation(s)
- E J Schlaeger
- F. Hoffmann-La Roche Ltd., Pharmaceutical Research Preclinical-Biotechnology, Basel, Switzerland.
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Grégoire M, Morais R, Quilliam MA, Gravel D. On auxotrophy for pyrimidines of respiration-deficient chick embryo cells. EUROPEAN JOURNAL OF BIOCHEMISTRY 1984; 142:49-55. [PMID: 6086342 DOI: 10.1111/j.1432-1033.1984.tb08249.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Chick embryo cells treated with chloramphenicol are inherently resistant to the growth-inhibitory effect of the drug when cultured in the presence of tryptose phosphate broth. The cells were found to be auxotrophic for pyrimidines and the presence in the broth of compounds of pyrimidine origin is demonstrated by chromatographic procedures and mass spectral analyses. They are in the form of ribonucleosides, ribonucleotides and pyrimidine-containing oligoribonucleotides. To understand the mechanism responsible for pyrimidine auxotrophy, the activity of enzymes involved in the pyrimidine biosynthetic pathway was determined. Measurement of the conversion of dihydroorotic acid to orotic acid in cell-free extracts revealed that chloramphenicol-treated chick embryo cells are deficient in dihydroorotate dehydrogenase activity. The data in vitro are supported by studies on the nutritional requirements of the respiration-deficient cells and by the incorporation in vivo of labelled dihydroorotic acid into the acid-insoluble fraction of the cells. Although the activity of the dehydrogenase in vitro is decreased by 95%, the enzyme is present in chloramphenicol-treated cells and its activity is unmasked by the artificial electron acceptor menadione. A study of the activity of other enzymes of the pyrimidine biosynthetic pathway demonstrated that their activity is comparable to that in control cells. The present results indicate that auxotrophy for pyrimidines results from the inhibition of the flow of electrons along the mitochondrial electron transport chain.
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Young DV. The partial replacement of the serum growth factor requirement of SV3T3 cells by lactalbumin hydrolyzate. J Cell Physiol 1976; 89:133-41. [PMID: 8467 DOI: 10.1002/jcp.1040890113] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Lactalbumin hydrolyzate (LH), a commercially prepared, enzymatic digest of a milk protein fraction, can partially replace the serum requirement of SV3T3 cells. In a low, but obligatory, background of calf serum (0.15% v/v), LH carses a large increase in the final cell density (5-10 x over the control) while modestly steimulating the actual growth rate. Lactalbumin hydrolyzate does not contain survival activity for SV3T3 cells and does not affect the growth of 3T3 cells. Since even prolonged exposure to pH 4 or 2 results in complete abolishment of the growth-rate stimulatory capability without affecting the capacity to increase the final cell density, it is possible that the LH growth activity may consist of two dissociable components. All of LH growth activity is water soluble, autoclavable, and resists proteolytic treatment. On Sephadex G15 growth activity appears as a single peak at the void volume but on G25 it is retained beyond the void volume as a broad, skewed peak. The relevant molecular weight range lies between 1,500 and 4,000. The putative low pH resistant material is strongly adsorbed to Dowex 1 x 2 and can be displaced from the column by a reduction in the pH. A comparison of the properties of the LH factors with those of known growth promoting agents isolated from serum and various enzymatic digests indicates that these new factors do not correspond to any of these agents.
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