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Zhang G, Huang C, Wang R, Guo J, Qin Y, Lv S. Chondroprotective effects of Apolipoprotein D in knee osteoarthritis mice through the PI3K/AKT/mTOR signaling pathway. Int Immunopharmacol 2024; 133:112005. [PMID: 38626543 DOI: 10.1016/j.intimp.2024.112005] [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: 02/14/2024] [Revised: 03/29/2024] [Accepted: 04/02/2024] [Indexed: 04/18/2024]
Abstract
BACKGROUND Because the pathophysiology of osteoarthritis (OA) has not been fully elucidated, targeted treatments are lacking. In this study, we assessed the role and underlying mechanism apolipoprotein D (APOD) on the development of OA. METHODS To establish an in vitro OA model, we extracted primary chondrocytes from the cartilage of C57BL/6 mice and stimulated the chondrocytes with IL-1β. After APOD intervention or incubation with an overexpressing plasmid, we detected inflammatory-related markers using RT-qPCR, Western blotting, and ELISA. To detect apoptosis and autophagy-related markers, we used flow cytometry, immunofluorescence, and transmission electron microscopy (TEM). Finally, we measured the level of oxidative stress. We also used RNA-seq to identify the APOD-regulated downstream signaling pathways. We used an in vivo mice OA model of the anterior cruciate ligament transection (ACLT) and administered intra-articular adenovirus overexpressing APOD. To examine cartilage damage severity, we used immunohistochemical analysis (IHC), micro-CT, scanning electron microscopy (SEM), and Safranin O-fast green staining. RESULTS Our results showed that APOD inhibited chondrocyte inflammation, degeneration, and apoptosis induced by IL-1β. Additionally, APOD reversed autophagy inhibition and oxidative stress and also blocked activation of the PI3K/AKT/mTOR signaling pathway induced by IL-1β. Finally, overexpression of the APOD gene through adenovirus was sufficient to mitigate OA progression. CONCLUSIONS Our findings revealed that APOD had a chondroprotective role in OA progression by the PI3K/AKT/mTOR signaling pathway.
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Affiliation(s)
- Gang Zhang
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China; Department of Orthopedics, Harbin First Hospital, Harbin, Heilongjiang Province, China; Future Medical Laboratory of the Second Affiliated Hospital of Harbin Medical University, China
| | - Chao Huang
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Ren Wang
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiangrong Guo
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yong Qin
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China.
| | - Songcen Lv
- Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China.
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Lei J, He W, Liu Y, Zhang Q, Liu Y, Ou Q, Wu X, Li F, Liao J, Xiao Y. The potential protective role of Parkinson's disease against hypothyroidism: co-localisation and bidirectional Mendelian randomization study. Front Aging Neurosci 2024; 16:1377719. [PMID: 38808034 PMCID: PMC11130391 DOI: 10.3389/fnagi.2024.1377719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Accepted: 04/29/2024] [Indexed: 05/30/2024] Open
Abstract
Background The association between hypothyroidism and Parkinson's disease (PD) has sparked intense debate in the medical community due to conflicting study results. A better understanding of this association is crucial because of its potential implications for both pathogenesis and treatment strategies. Methods To elucidate this complex relationship, we used Bayesian co-localisation (COLOC) and bidirectional Mendelian randomization (MR) analysis. COLOC was first used to determine whether hypothyroidism and PD share a common genetic basis. Subsequently, genetic variants served as instrumental variables in a bidirectional MR to explore causal interactions between these conditions. Results COLOC analysis revealed no shared genetic variants between hypothyroidism and PD, with a posteriori probability of hypothesis 4 (PPH4) = 0.025. Furthermore, MR analysis indicated that hypothyroidism does not have a substantial causal effect on PD (OR = 0.990, 95% CI = 0.925, 1.060, p = 0.774). Conversely, PD appears to have a negative causal effect on hypothyroidism (OR = 0.776, 95% CI = 0.649, 0.928, p = 0.005). Conclusion Our findings suggest the absence of shared genetic variants between hypothyroidism and PD. Interestingly, PD may inversely influence the risk of developing hypothyroidism, a finding that may inform future research and clinical approaches.
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Affiliation(s)
- Jiang Lei
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Wenxuan He
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Yao Liu
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Qinxin Zhang
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Yingyao Liu
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Qican Ou
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Xianli Wu
- Department of Neurology, The First People’s Hospital of Nanning, Nanning, China
| | - Fenglin Li
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Jiajia Liao
- Department of Rehabilitation Medicine, Jiangbin Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Yousheng Xiao
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
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Székely A, Pállinger É, Töreki E, Ifju M, Barta BA, Szécsi B, Losoncz E, Dohy Z, Barabás IJ, Kosztin A, Buzas EI, Radovits T, Merkely B. Recipient Pericardial Apolipoprotein Levels Might Be an Indicator of Worse Outcomes after Orthotopic Heart Transplantation. Int J Mol Sci 2024; 25:1752. [PMID: 38339027 PMCID: PMC10855207 DOI: 10.3390/ijms25031752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 01/16/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
BACKGROUND End-stage heart failure (ESHF) leads to hypoperfusion and edema formation throughout the body and is accompanied by neurohormonal and immunological alterations. Orthotopic heart transplantation (HTX) has been used as a beneficial option for ESHF. Due to the shortage of donor hearts, the ideal matching and timing of donors and recipients has become more important. PURPOSE In this study, our aim was to explore the relationship between the clinical outcomes of HTX and the cytokine and apolipoprotein profiles of the recipient pericardial fluid obtained at heart transplantation after opening the pericardial sac. MATERIALS AND METHODS The clinical data and the interleukin, adipokine, and lipoprotein levels in the pericardial fluid of twenty HTX recipients were investigated. Outcome variables included primer graft dysfunction (PGD), the need for post-transplantation mechanical cardiac support (MCS), International Society for Heart and Lung Transplantation grade ≥2R rejection, and mortality. Recipient risk scores were also investigated. RESULTS Leptin levels were significantly lower in patients with PGD than in those without PGD (median: 6.36 (IQR: 5.55-6.62) versus 7.54 (IQR = 6.71-10.44); p = 0.029). Higher ApoCII levels (median: 14.91 (IQR: 11.55-21.30) versus 10.31 (IQR = 10.02-13.07); p = 0.042) and ApoCIII levels (median: 60.32 (IQR: 43.00-81.66) versus 22.84 (IQR = 15.84-33.39); p = 0.005) were found in patients (n = 5) who died in the first 5 years after HTX. In patients who exhibited rejection (n = 4) in the first month after transplantation, the levels of adiponectin (median: 74.48 (IQR: 35.51-131.70) versus 29.96 (IQR: 19.86-42.28); p = 0.039), ApoCII (median: 20.11 (IQR: 13.06-23.54) versus 10.32 (IQR: 10.02-12.84); p = 0.007), and ApoCIII (median: 70.97 (IQR: 34.72-82.22) versus 26.33 (IQR: 17.18-40.17); p = 0.029) were higher than in the nonrejection group. Moreover, the pericardial thyroxine (T4) levels (median: 3.96 (IQR: 3.49-4.46) versus 4.69 (IQR: 4.23-5.77); p = 0.022) were lower in patients with rejection than in patients who did not develop rejection. CONCLUSION Our results indicate that apolipoproteins can facilitate the monitoring of rejection and could be a useful tool in the forecasting of early and late complications.
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Affiliation(s)
- Andrea Székely
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1085 Budapest, Hungary
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, 1085 Budapest, Hungary; (É.P.)
| | - Evelin Töreki
- Faculty of Medicine, Semmelweis University, 1085 Budapest, Hungary
| | - Mandula Ifju
- Faculty of Medicine, Semmelweis University, 1085 Budapest, Hungary
| | | | - Balázs Szécsi
- Doctoral School of Theoretical and Translational Medicine, Semmelweis University, 1085 Budapest, Hungary; (B.S.)
| | - Eszter Losoncz
- Doctoral School of Theoretical and Translational Medicine, Semmelweis University, 1085 Budapest, Hungary; (B.S.)
| | - Zsófia Dohy
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
| | - Imre János Barabás
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
| | - Annamária Kosztin
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
| | - Edit I. Buzas
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, 1085 Budapest, Hungary; (É.P.)
- HCEMM-SU Extracellular Vesicle Research Group, Semmelweis University, 1085 Budapest, Hungary
- HUN-REN-SU Translational Extracellular Vesicle Research Group, Semmelweis University, 1085 Budapest, Hungary
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, 1085 Budapest, Hungary
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Rehman H, Ang TFA, Tao Q, Espenilla AL, Au R, Farrer LA, Zhang X, Qiu WQ. Comparison of Commonly Measured Plasma and Cerebrospinal Fluid Proteins and Their Significance for the Characterization of Cognitive Impairment Status. J Alzheimers Dis 2024; 97:621-633. [PMID: 38143358 DOI: 10.3233/jad-230837] [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] [Indexed: 12/26/2023]
Abstract
BACKGROUND Although cerebrospinal fluid (CSF) amyloid-β42 peptide (Aβ42) and phosphorylated tau (p-tau) and blood p-tau are valuable for differential diagnosis of Alzheimer's disease (AD) from cognitively normal (CN) there is a lack of validated biomarkers for mild cognitive impairment (MCI). OBJECTIVE This study sought to determine how plasma and CSF protein markers compared in the characterization of MCI and AD status. METHODS This cohort study included Alzheimer's Disease Neuroimaging Initiative (ADNI) participants who had baseline levels of 75 proteins measured commonly in plasma and CSF (257 total, 46 CN, 143 MCI, and 68 AD). Logistic regression, least absolute shrinkage and selection operator (LASSO) and Random Forest (RF) methods were used to identify the protein candidates for the disease classification. RESULTS We observed that six plasma proteins panel (APOE, AMBP, C3, IL16, IGFBP2, APOD) outperformed the seven CSF proteins panel (VEGFA, HGF, PRL, FABP3, FGF4, CD40, RETN) as well as AD markers (CSF p-tau and Aβ42) to distinguish the MCI from AD [area under the curve (AUC) = 0.75 (plasma proteins), AUC = 0.60 (CSF proteins) and AUC = 0.56 (CSF p-tau and Aβ42)]. Also, these six plasma proteins performed better than the CSF proteins and were in line with CSF p-tau and Aβ42 in differentiating CN versus MCI subjects [AUC = 0.89 (plasma proteins), AUC = 0.85 (CSF proteins) and AUC = 0.89 (CSF p-tau and Aβ42)]. These results were adjusted for age, sex, education, and APOEϵ4 genotype. CONCLUSIONS This study suggests that the combination of 6 plasma proteins can serve as an effective marker for differentiating MCI from AD and CN.
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Affiliation(s)
- Habbiburr Rehman
- Department of Medicine (Biomedical Genetics), Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
| | - Ting Fang Alvin Ang
- Department of Anatomy & Neurobiology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Neurology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
| | - Qiushan Tao
- Department of Pharmacology & Experimental Therapeutics, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
| | - Arielle Lauren Espenilla
- Department of Biostatistics and Boston University School of Public Health, Boston, MA, USA
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Rhoda Au
- Department of Medicine (Biomedical Genetics), Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Anatomy & Neurobiology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Neurology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
- Framingham Heart Study, Boston University School of Medicine, Framingham, MA, USA
- Alzheimer's Disease Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Lindsay A Farrer
- Department of Medicine (Biomedical Genetics), Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Neurology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Ophthalmology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Biostatistics and Boston University School of Public Health, Boston, MA, USA
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
- Framingham Heart Study, Boston University School of Medicine, Framingham, MA, USA
- Alzheimer's Disease Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Xiaoling Zhang
- Department of Medicine (Biomedical Genetics), Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Biostatistics and Boston University School of Public Health, Boston, MA, USA
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
- Framingham Heart Study, Boston University School of Medicine, Framingham, MA, USA
- Alzheimer's Disease Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Wei Qiao Qiu
- Department of Anatomy & Neurobiology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Neurology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Pharmacology & Experimental Therapeutics, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Department of Psychiatry, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA
- Alzheimer's Disease Research Center, Boston University School of Medicine, Boston, MA, USA
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5
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Li Y, Tang M, Dang W, Zhu S, Wang Y. Identification of disulfidptosis-related subtypes, characterization of tumor microenvironment infiltration, and development of a prognosis model in colorectal cancer. J Cancer Res Clin Oncol 2023; 149:13995-14014. [PMID: 37543978 DOI: 10.1007/s00432-023-05211-1] [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: 07/09/2023] [Accepted: 07/25/2023] [Indexed: 08/08/2023]
Abstract
BACKGROUND Colorectal cancer is the second leading cause of cancer-related deaths, which imposes a significant societal burden. Regular screening and emerging molecular tumor markers have important implications for detecting the progression and development of colorectal cancer. Disulfidptosis is a newly defined type of programmed cell death triggered by abnormal accumulation of disulfide compounds in cells that stimulate disulfide stress. Currently, there is no relevant discussion on this mechanism and colorectal cancer. METHODS We classified the disulfidptosis-related subtypes of colorectal cancer using bioinformatics methods. Through secondary clustering of differentially expressed genes between subtypes, we identified characteristic genes of the disulfidptosis subtype, constructed a prognostic model, and searched for potential biomarkers through clinical validation. RESULTS Using disulfidptosis-related genes collected from the literature, we classified colorectal cancer patients from public databases into three subtypes. The differentially expressed genes between subtypes were clustered into three gene subtypes, and eight characteristic genes were screened to construct a prognostic model. CONCLUSION The disulfidptosis mechanism has important value in the classification of colorectal cancer patients, and characteristic genes selected based on this mechanism can serve as a new potential biological marker for colorectal cancer.
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Affiliation(s)
- Ying Li
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
- Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Mengyao Tang
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
- Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Wei Dang
- The First College for Clinical Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
- Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China
| | - Shu Zhu
- Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China.
- Department of Gastroenterology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jingshi Street, Lixia District, Jinan, Shandong, China.
| | - Yunpeng Wang
- Shandong University of Traditional Chinese Medicine, Jinan, Shandong, China.
- Department of Gastroenterology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jingshi Street, Lixia District, Jinan, Shandong, China.
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del Valle E, Rubio-Sardón N, Menéndez-Pérez C, Martínez-Pinilla E, Navarro A. Apolipoprotein D as a Potential Biomarker in Neuropsychiatric Disorders. Int J Mol Sci 2023; 24:15631. [PMID: 37958618 PMCID: PMC10650001 DOI: 10.3390/ijms242115631] [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: 10/08/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 11/15/2023] Open
Abstract
Neuropsychiatric disorders (NDs) are a diverse group of pathologies, including schizophrenia or bipolar disorders, that directly affect the mental and physical health of those who suffer from them, with an incidence that is increasing worldwide. Most NDs result from a complex interaction of multiple genes and environmental factors such as stress or traumatic events, including the recent Coronavirus Disease (COVID-19) pandemic. In addition to diverse clinical presentations, these diseases are heterogeneous in their pathogenesis, brain regions affected, and clinical symptoms, making diagnosis difficult. Therefore, finding new biomarkers is essential for the detection, prognosis, response prediction, and development of new treatments for NDs. Among the most promising candidates is the apolipoprotein D (Apo D), a component of lipoproteins implicated in lipid metabolism. Evidence suggests an increase in Apo D expression in association with aging and in the presence of neuropathological processes. As a part of the cellular neuroprotective defense machinery against oxidative stress and inflammation, changes in Apo D levels have been demonstrated in neuropsychiatric conditions like schizophrenia (SZ) or bipolar disorders (BPD), not only in some brain areas but in corporal fluids, i.e., blood or serum of patients. What is not clear is whether variation in Apo D quantity could be used as an indicator to detect NDs and their progression. This review aims to provide an updated view of the clinical potential of Apo D as a possible biomarker for NDs.
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Affiliation(s)
- Eva del Valle
- Department of Morphology and Cell Biology, University of Oviedo, 33006 Oviedo, Spain; (E.d.V.); (N.R.-S.); (C.M.-P.); (A.N.)
- Instituto de Neurociencias del Principado de Asturias (INEUROPA), 33006 Oviedo, Spain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33006 Oviedo, Spain
| | - Nuria Rubio-Sardón
- Department of Morphology and Cell Biology, University of Oviedo, 33006 Oviedo, Spain; (E.d.V.); (N.R.-S.); (C.M.-P.); (A.N.)
- Instituto de Neurociencias del Principado de Asturias (INEUROPA), 33006 Oviedo, Spain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33006 Oviedo, Spain
| | - Carlota Menéndez-Pérez
- Department of Morphology and Cell Biology, University of Oviedo, 33006 Oviedo, Spain; (E.d.V.); (N.R.-S.); (C.M.-P.); (A.N.)
- Instituto de Neurociencias del Principado de Asturias (INEUROPA), 33006 Oviedo, Spain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33006 Oviedo, Spain
| | - Eva Martínez-Pinilla
- Department of Morphology and Cell Biology, University of Oviedo, 33006 Oviedo, Spain; (E.d.V.); (N.R.-S.); (C.M.-P.); (A.N.)
- Instituto de Neurociencias del Principado de Asturias (INEUROPA), 33006 Oviedo, Spain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33006 Oviedo, Spain
| | - Ana Navarro
- Department of Morphology and Cell Biology, University of Oviedo, 33006 Oviedo, Spain; (E.d.V.); (N.R.-S.); (C.M.-P.); (A.N.)
- Instituto de Neurociencias del Principado de Asturias (INEUROPA), 33006 Oviedo, Spain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33006 Oviedo, Spain
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Mahoney KJ, Bowie JS, Ford AE, Perera N, Sekiguchi Y, Fothergill DM, Lee EC. Plasma Proteomics-Based Discovery of Mechanistic Biomarkers of Hyperbaric Stress and Pulmonary Oxygen Toxicity. Metabolites 2023; 13:970. [PMID: 37755249 PMCID: PMC10534745 DOI: 10.3390/metabo13090970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/31/2023] [Accepted: 08/01/2023] [Indexed: 09/28/2023] Open
Abstract
Our aim was to identify proteins that reflect an acute systemic response to prolonged hyperbaric stress and discover potential biomarker pathways for pulmonary O2 toxicity. The study was a double-blind, randomized, crossover design in trained male Navy diver subjects. Each subject completed two dry resting hyperbaric chamber dives separated by a minimum of one week. One dive exposed the subject to 6.5 h of 100% oxygen (O2) at 2ATA. The alternate dive exposed the subjects to an enhanced air nitrox mixture (EAN) containing 30.6% O2 at the same depth for the same duration. Venous blood samples collected before (PRE) and after (POST) each dive were prepared and submitted to LC-MS/MS analysis (2 h runs). A total of 346 total proteins were detected and analyzed. A total of 12 proteins were significantly increased at EANPOST (vs. EANPRE), including proteins in hemostasis and immune signaling and activation. Significantly increased proteins at O2PRE (vs. O2POST) included neural cell adhesion molecule 1, glycoprotein Ib, catalase, hemoglobin subunit beta, fibulin-like proteins, and complement proteins. EANPOST and O2POST differed in biomarkers related to coagulation, immune signaling and activation, and metabolism. Of particular interest is (EANPOST vs. O2POST), which is protective against oxidative stress.
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Affiliation(s)
- Kyle J. Mahoney
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
| | - Jacob S. Bowie
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
| | - Austin E. Ford
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
| | - Neranjan Perera
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
| | - Yasuki Sekiguchi
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
| | | | - Elaine C. Lee
- Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA; (K.J.M.); (J.S.B.); (N.P.)
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