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Langbøl M, Rovelt J, Saruhanian A, Saruhanian S, Tiedemann D, Baskaran T, Bocca C, Vohra R, Cvenkel B, Lenaers G, Kolko M. Distinct Metabolic Profiles of Ocular Hypertensives in Response to Hypoxia. Int J Mol Sci 2023; 25:195. [PMID: 38203366 PMCID: PMC10779258 DOI: 10.3390/ijms25010195] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 12/20/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024] Open
Abstract
Glaucoma is a neurodegenerative disease that affects the retinal ganglion cells (RGCs). The main risk factor is elevated intraocular pressure (IOP), but the actual cause of the disease remains unknown. Emerging evidence indicates that metabolic dysfunction plays a central role. The aim of the current study was to determine and compare the effect of universal hypoxia on the metabolomic signature in plasma samples from healthy controls (n = 10), patients with normal-tension glaucoma (NTG, n = 10), and ocular hypertension (OHT, n = 10). By subjecting humans to universal hypoxia, we aim to mimic a state in which the mitochondria in the body are universally stressed. Participants were exposed to normobaric hypoxia for two hours, followed by a 30 min recovery period in normobaric normoxia. Blood samples were collected at baseline, during hypoxia, and in recovery. Plasma samples were analyzed using a non-targeted metabolomics approach based on liquid chromatography coupled with high-resolution mass spectrometry (LC-HRMS). Multivariate analyses were conducted using principal component analysis (PCA) and orthogonal partial least squares-discriminant analysis (OPLS-DA), and univariate analysis using the Wilcoxon signed-rank test and false discovery rate (FDR) correction. Unique metabolites involved in fatty acid biosynthesis and ketone body metabolism were upregulated, while metabolites of the kynurenine pathway were downregulated in OHT patients exposed to universal hypoxia. Differential affection of metabolic pathways may explain why patients with OHT initially do not suffer or are more resilient from optic nerve degeneration. The metabolomes of NTG and OHT patients are regulated differently from control subjects and show dysregulation of metabolites important for energy production. These dysregulated processes may potentially contribute to the elevation of IOP and, ultimately, cell death of the RGCs.
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Affiliation(s)
- Mia Langbøl
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
| | - Jens Rovelt
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
- Department of Ophthalmology, Copenhagen University Hospital, Rigshospitalet, 2600 Glostrup, Denmark
| | - Arevak Saruhanian
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
| | - Sarkis Saruhanian
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
- Department of Veterinary & Animal Sciences, University of Copenhagen, 2000 Frederiksberg, Denmark
| | - Daniel Tiedemann
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
- Department of Ophthalmology, Copenhagen University Hospital, Rigshospitalet, 2600 Glostrup, Denmark
| | - Thisayini Baskaran
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
| | - Cinzia Bocca
- Faculté de Santé, Institut MITOVASC, UMR CNRS 6015, INSERM U1083, Université d’Angers, 49933 Angers, France; (C.B.); (G.L.)
- Département de Biochimie et Biologie Moléculaire, Centre Hospitalier Universitaire (CHU), 49933 Angers, France
| | - Rupali Vohra
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
- Department of Ophthalmology, Copenhagen University Hospital, Rigshospitalet, 2600 Glostrup, Denmark
| | - Barbara Cvenkel
- Department of Ophthalmology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia;
- Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Guy Lenaers
- Faculté de Santé, Institut MITOVASC, UMR CNRS 6015, INSERM U1083, Université d’Angers, 49933 Angers, France; (C.B.); (G.L.)
| | - Miriam Kolko
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (M.L.); (J.R.); (A.S.); (S.S.); (D.T.); (T.B.); (R.V.)
- Department of Ophthalmology, Copenhagen University Hospital, Rigshospitalet, 2600 Glostrup, Denmark
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Langbøl M, Saruhanian S, Baskaran T, Tiedemann D, Mouhammad ZA, Toft-Kehler AK, Jun B, Vohra R, Bazan NG, Kolko M. Increased Antioxidant Capacity and Pro-Homeostatic Lipid Mediators in Ocular Hypertension-A Human Experimental Model. J Clin Med 2020; 9:jcm9092979. [PMID: 32942740 PMCID: PMC7563216 DOI: 10.3390/jcm9092979] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/10/2020] [Accepted: 09/10/2020] [Indexed: 11/16/2022] Open
Abstract
The main risk factor for primary open-angle glaucoma (POAG) is increased intraocular pressure (IOP). It is of interest that about half of the patients have an IOP within the normal range (normal-tension glaucoma, NTG). Additionally, there is a group of patients with a high IOP but no glaucomatous neurodegeneration (ocular hypertension, OHT). Therefore, risk factors other than IOP are involved in the pathogenesis of glaucoma. Since the retina has a very high oxygen-demand, decreased autoregulation and a fluctuating oxygen supply to the retina have been linked to glaucomatous neurodegeneration. To assess the significance of these mechanisms, we have utilized a human experimental model, in which we stress participants with a fluctuating oxygen supply. Levels of oxidative stress molecules, antioxidants, and lipid mediators were measured in the plasma. Patients with NTG, OHT, and control subjects were found to have similar levels of oxidative stress markers. In contrast, patients with OHT had a higher level of total antioxidant capacity (TAC) and pro-homeostatic lipid mediators. Thus, we suggest that OHT patients manage fluctuating oxygen levels more efficiently and, thus, are less susceptible to glaucomatous neurodegenerations, due to enhanced systemic antioxidant protection.
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Affiliation(s)
- Mia Langbøl
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
- Correspondence: (M.L.); (M.K.); Tel.: +45-30-50-26-62 (M.L.); +45-29-80-76-67 (M.K.)
| | - Sarkis Saruhanian
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
| | - Thisayini Baskaran
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
| | - Daniel Tiedemann
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
| | - Zaynab A. Mouhammad
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
| | - Anne Katrine Toft-Kehler
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
| | - Bokkyoo Jun
- Neuroscience Center of Excellence, Louisiana State University Health New Orleans, New Orleans, LA 70112, USA; (B.J.); (N.G.B.)
| | - Rupali Vohra
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
- Department of Veterinary and Animal Sciences, University of Copenhagen, 2000 Frederiksberg, Denmark
| | - Nicolas G. Bazan
- Neuroscience Center of Excellence, Louisiana State University Health New Orleans, New Orleans, LA 70112, USA; (B.J.); (N.G.B.)
| | - Miriam Kolko
- Department of Drug Design and Pharmacology, University of Copenhagen, 2100 Copenhagen, Denmark; (S.S.); (T.B.); (D.T.); (Z.A.M.); (A.K.T.-K.); (R.V.)
- Department of Ophthalmology, Copenhagen University Hospital, Rigshospitalet-Glostrup, 2600 Glostrup, Denmark
- Correspondence: (M.L.); (M.K.); Tel.: +45-30-50-26-62 (M.L.); +45-29-80-76-67 (M.K.)
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Langbøl M, Baskaran T, Tiedemann D, Saruhanian S, Katrine Toft‐Kehler A, Koch Jensen P, Skov Jensen P, Vidiendal Olsen N, Vohra R, Kolko M. Retinal vessel diameters and systemic antioxidant capacity during hypoxia in patients with normal‐tension glaucoma and individuals with ocular hypertension. Acta Ophthalmol 2019. [DOI: 10.1111/j.1755-3768.2019.5342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Mia Langbøl
- Department of Drug Design and Pharmacology Copenhagen Denmark
| | | | | | | | | | | | | | | | - Rupali Vohra
- Department of Drug Design and Pharmacology Copenhagen Denmark
| | - Miriam Kolko
- Department of Drug Design and Pharmacology Copenhagen Denmark
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Raman N, Pothiraj K, Baskaran T. Synthesis, characterization, and DNA damaging of bivalent metal complexes incorporating tetradentate dinitrogen–dioxygen ligand as potential biocidal agents. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.638979] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- N. Raman
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626 001 , Tamil Nadu , India
| | - K. Pothiraj
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626 001 , Tamil Nadu , India
| | - T. Baskaran
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626 001 , Tamil Nadu , India
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Raman N, Pothiraj K, Baskaran T. DNA-binding, oxidative DNA cleavage, and coordination mode of later 3d transition metal complexes of a Schiff base derived from isatin as antimicrobial agents. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.634005] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- N. Raman
- a Research Department of Chemistry , VHNSN College , Virudhunagar – 626001, India
| | - K. Pothiraj
- a Research Department of Chemistry , VHNSN College , Virudhunagar – 626001, India
| | - T. Baskaran
- a Research Department of Chemistry , VHNSN College , Virudhunagar – 626001, India
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Baskaran T, Nagan S, Rajkumar AS. Assessment of sediment accumulation and capacity of reservoir by analytical approach--a case study. J Environ Sci Eng 2011; 53:15-20. [PMID: 22324140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Sedimentation in reservoirs is a major problem in all countries. A study on sediment accumulation in a reservoir is necessary for effective reservoir planning and watershed management systems. In this study, the volume of sediment deposition in the Vaigai reservoir is calculated based on the analytical approach. The historical water inflow for the years 1959 to 1999 (41 years) are used to calculate the water inflow for future years. The volume of sediment accumulation in the reservoir is predicted using the calculated water inflows. Based on the volume of sediment accumulation, the capacity of reservoir and the percentage of loss in capacity were also calculated. The result obtained from the analytical method is compared with the actual capacity of reservoir and found that the calculated values match well with the actual results.
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Affiliation(s)
- T Baskaran
- Thiagarajar College of Engineering, Madurai--625 015, India.
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Raman N, Jeyamurugan R, Rani RU, Baskaran T, Mitu L. Synthesis, characterization, DNA binding, oxidative damage of DNA strand scission, and antimicrobial activities of β-diketone condensed Schiff-base transition metal complexes. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.485643] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- N. Raman
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626001, Tamil Nadu, India
| | - R. Jeyamurugan
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626001, Tamil Nadu, India
| | - R. Usha Rani
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626001, Tamil Nadu, India
| | - T. Baskaran
- a Research Department of Chemistry , VHNSN College , Virudhunagar 626001, Tamil Nadu, India
| | - L. Mitu
- b Department of Physics and Chemistry , University of Pitesti , Pitesti 110040, Romania
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Lintschinger B, Balzer-Geldsetzer M, Baskaran T, Graier WF, Romanin C, Zhu MX, Groschner K. Coassembly of Trp1 and Trp3 proteins generates diacylglycerol- and Ca2+-sensitive cation channels. J Biol Chem 2000; 275:27799-805. [PMID: 10882720 DOI: 10.1074/jbc.m002705200] [Citation(s) in RCA: 252] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
To analyze the functional consequences of coassembly of transient receptor potential 1 (Trp1) and Trp3 channel proteins, we characterized membrane conductances and divalent cation entry derived by separate overexpression and by coexpression of both Trp isoforms. Trp1 expression generated a 1-oleoyl-2-acetyl-sn-glycerol (OAG)-activated conductance that was detectable only in Ca(2+)-free extracellular solution. Trp3 expression gave rise to an OAG-activated conductance that was suppressed but clearly detectable at physiological Ca(2+) concentrations. Coexpression of both species resulted in a constitutively active, OAG-sensitive conductance, which exhibited distinctive cation selectivity and high sensitivity to inhibition by intracellular Ca(2+). Trp1-expressing cells displayed only modest carbachol-induced Ca(2+) entry and lacked OAG-induced Sr(2+) entry, whereas Trp3-expressing cells responded to both agents with a substantial divalent cation entry. Coexpression of Trp1 plus Trp3 suppressed carbachol-induced Ca(2+) entry compared with Trp3 expression and abolished OAG-induced Sr(2+) entry signals. We concluded that coassembly of Trp1 and Trp3 resulted in the formation of oligomeric Trp channels that are subject to regulation by phospholipase C and Ca(2+). The distinguished Ca(2+) sensitivity of these Trp1/Trp3 hetero-oligomers appeared to limit Trp-mediated Ca(2+) signals and may be of importance for negative feedback control of Trp function in mammalian cells.
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Affiliation(s)
- B Lintschinger
- Departments of Pharmacology und Toxikology and Medical Biochemistry and Medical Molecular Biology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria
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Abstract
Griseofulvin is a poorly soluble antifungal antibiotic drug, the solubility of which can be enhanced by complexation with beta-cyclodextrin. The inclusion complex was prepared by coprecipitation method in various molar ratios of 1:1, 2:1, 3:1, and 1:2 of the drug and beta-cyclodextrin, respectively. The inclusion complex was characterized and evaluated by UV-VIS spectral studies and FTIR. The in vitro drug release studies indicated that the 1:2 molar ratio complex form of the drug significantly increased the dissolution rate when compared to the free form. The acute toxicity studies clearly indicated that the beta-cyclodextrin complex was nontoxic and the safety range was close to other Griseofulvin formulations. The in vivo study of the beta-cyclodextrin was carried out in both animals and human beings by administering in four different rabbits and volunteers, respectively. Pellets made with Griseofulvin-beta-cyclodextrin complex also showed a significant increase in the dissolution of the drug, revealing that beta-cyclodextrin plays an important role in the solubilization of Griseofulvin.
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Affiliation(s)
- M D Dhanaraju
- Department of Pharmaceutics, C. L. Baid Metha College of Pharmacy, Madras, India
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