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Rhoda JC, Chellammal S, Albert HM, Ravichandran K, Gonsago CA. Synthesis, Spectroscopic, and Antibacterial Characterizations of Cadmium-Based Nanoparticles. J Fluoresc 2024; 34:587-598. [PMID: 37326926 DOI: 10.1007/s10895-023-03290-4] [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: 05/17/2023] [Accepted: 05/27/2023] [Indexed: 06/17/2023]
Abstract
In the current study, the co-precipitation technique was employed for the synthesis of Cadmium oxide (CdO) and Copper‒doped Cadmium oxide (Cu‒CdO) nanoparticles. The synthesized samples were subjected to powder X-Ray diffraction (P-XRD), Field emission scanning electron microscopy (FE-SEM), Energy-dispersive X-ray (EDX), Fourier transforms Infrared (FT-IR), UV-Vis spectroscopy, photoluminescence (PL), laser-induced fluorescence spectroscopy and antibacterial investigations. According to the P-XRD analysis, both the samples were simple cubic in structure and have average grain sizes of 54 and 28 nm, respectively. FE-SEM was deployed to explore the surface textures of the samples. EDX technique was used to look at the elemental compositions of the samples. The technique of FT-IR was employed to identify the vibrational modes. UV-Vis spectra in diffuse reflectance mode were obtained and the optical bandgaps of the CdO and Cu‒CdO samples were obtained as 4.52 eV and 2.83 eV, respectively. The photoluminescence studies were conducted at an excitation wavelength of 300 nm and emission peaks were red-shifted in both samples. Fluorescence spectroscopy was applied to explore the lifetimes of synthesized nanoparticles. The technique of Agar-well diffusion was applied to assess the antibacterial performance of the generated nanoparticles against Micrococcus Luteus (gram-positive) and Escherichia coli (gram-negative) bacterium at variable concentrations. Both samples in the current study are significantly effective against both bacterial strains.
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Affiliation(s)
- J Christina Rhoda
- Department of Physics, Dr. M.G.R. Educational & Research Institute, Chennai, India
| | - S Chellammal
- Department of Physics, Dr. M.G.R. Educational & Research Institute, Chennai, India
| | - Helen Merina Albert
- Department of Physics, Sathyabama Institute of Science & Technology, Chennai, India
| | - K Ravichandran
- Department of Nuclear Physics, University of Madras (Guindy Campus), Chennai, India
| | - C Alosious Gonsago
- Department of Electronics Science, Mohamed Sathak College of Arts & Science, Chennai, India.
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Sureshkumar J, Jenipher C, Sriramavaratharajan V, Gurav SS, Gandhi GR, Ravichandran K, Ayyanar M. Genus Equisetum L: Taxonomy, toxicology, phytochemistry and pharmacology. J Ethnopharmacol 2023; 314:116630. [PMID: 37207877 DOI: 10.1016/j.jep.2023.116630] [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] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/21/2023] [Accepted: 05/09/2023] [Indexed: 05/21/2023]
Abstract
INTRODUCTION The genus Equisetum (Equisetaceae) is cosmopolitan in distribution, with 41 recognized species. Several species of Equisetum are widely used in treating genitourinary and related diseases, inflammatory and rheumatic problems, hypertension, and wound healing in traditional medicine practices worldwide. This review intends to present information on the traditional uses, phytochemical components, pharmacological activities, and toxicity of Equisetum spp. and to analyze the new insights for further study. METHODS Relevant literature has been scanned and collected via various electronic repositories, including PubMed, Science Direct, Google Scholar, Springer Connect, and Science Online, from 1960 to 2022. RESULTS Sixteen Equisetum spp. were documented as widely used in traditional medicine practices by different ethnic groups throughout the world. A total of 229 chemical compounds were identified from Equisetum spp. with the major group of constituents being flavonol glycosides and flavonoids. The crude extracts and phytochemicals of Equisetum spp. exhibited significant antioxidant, antimicrobial, anti-inflammatory, antiulcerogenic, antidiabetic, hepatoprotective, and diuretic properties. A wide range of studies have also demonstrated the safety of Equisetum spp. CONCLUSION The reported pharmacological properties of Equisetum spp. support its use in traditional medicine, though there are gaps in understanding the traditional usage of these plants for clinical experiments. The documented information revealed that the genus is not only a great herbal remedy but also has several bioactives with the potential to be discovered as novel drugs. Detailed scientific investigation is still needed to fully understand the efficacy of this genus; hence, very few Equisetum spp. were studied in detail for phytochemical and pharmacological investigation. Moreover, its bioactives, structure-activity connection, in vivo activity, and associated mechanism of action ought to be explored further.
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Affiliation(s)
- J Sureshkumar
- Department of Botany, Sri Kaliswari College (Autonomous), (Affiliated to Madurai Kamaraj University), Sivakasi, 626 123, India.
| | - C Jenipher
- Department of Botany, A.V.V.M. Sri Pushpam College (Affiliated to Bharathidasan University), Poondi, Thanjavur, 613 503, Tamil Nadu, India.
| | - V Sriramavaratharajan
- School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, 613 401, India.
| | - S S Gurav
- Department of Pharmacognosy, Goa College of Pharmacy, Panaji, Goa University, Goa, 403 001, India.
| | - G Rajiv Gandhi
- Department of Biosciences, Rajagiri College of Social Sciences, Kalamaserry, Kochi, 683104, India.
| | - K Ravichandran
- Department of Physics, A.V.V.M. Sri Pushpam College (Affiliated to Bharathidasan University), Poondi, Thanjavur, 613 503, Tamil Nadu, India.
| | - M Ayyanar
- Department of Botany, A.V.V.M. Sri Pushpam College (Affiliated to Bharathidasan University), Poondi, Thanjavur, 613 503, Tamil Nadu, India.
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Adiyat KT, Pooleri GK, Cherian DT, Santhamma SGN, Ravichandran K, Sundaram S. Negative predictive value of PSMA PET scan for lymph node staging in patients undergoing robotic radical prostatectomy and pelvic lymph node dissection. Int Urol Nephrol 2023; 55:1453-1457. [PMID: 37086333 DOI: 10.1007/s11255-023-03595-0] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 04/09/2023] [Indexed: 04/23/2023]
Abstract
PURPOSE To assess the negative predictive value of PSMA PET scan for lymph node staging in patients undergoing robotic radical prostatectomy and pelvic lymph node dissection. MATERIALS AND METHODS A retrospective analysis of patients who underwent robotic-assisted radical prostatectomy with pelvic lymph node dissection and had a preoperative negative PSMA PET scan for metastasis was performed. The documented pre-operative variables studied included age, BMI, PSA at diagnosis, Gleason score, and biopsy ISUP grades. Patients were categorised as low, intermediate and high risk according to the D Amico classification. The post-op variables included were number of lymph nodes harvested, number of positive nodes, positivity rate, size of the node metastasis, T staging and ISUP grading. RESULTS The overall negative predictive value of PSMA PET scan was 71.6%. Further sub-classification according to risk stratification demonstrated a NPV of 58.02%, 92.7% and 90% for high, intermediate and low risk, respectively. CONCLUSION Pelvic lymph node dissection cannot be excluded based on a negative preop PSMA PET/CT scan.
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Affiliation(s)
- Kishore Thekke Adiyat
- Aster Medcity, Kochi, India.
- Department of Urology, Aster Medcity, Kuttisahib Road, Cheranelloor, Ernakulam, Kerala, 682027, India.
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Suvathi S, Rathi R, Ravichandran K, Kavitha P, Ayyanar M, Praseetha PK, Chidhambaram N. Improved photocatalytic dye degradation and seed germination through enzyme-coupled titanium oxide nanopowder - A cost-effective approach. Environ Res 2023; 218:114973. [PMID: 36460076 DOI: 10.1016/j.envres.2022.114973] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/21/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Enzyme-coupled titanium oxide nanopowder samples were prepared usingdifferent volumes of vermiwash using a cost-effective soft chemical method and their photocatalytic efficiency was studied against Methylene Blue (MB) dye decomposition. The volume of vermiwash used in the starting solution was varied from 50 to 200 mL in steps of 50 mL and the effect of enzymes prevalent in the vermiwash on the photocatalytic activity of titanium oxide (TiO2) was studied. The resultant water obtained after the photocatalytic dye degradation was found to inherit the enzymes from the nanoproduct. This enzyme-activated treated water showed effective seed germination of black gram (Vigna mungo L.). The results suggested that the enzyme-coupled TiO2 can be used as an effective and eco-friendly material for the treatment of contaminated water and consequently the treated water can also be utilized for enhanced seed germination.
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Affiliation(s)
- S Suvathi
- PG & Research Department of Physics, AVVM Sri Pushpam College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Poondi, Thanjavur, 613 503, Tamil Nadu, India
| | - R Rathi
- Department of Physics, Sengamala Thayaar Educational Trust Women's College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Sundarakkottai, Mannargudi, 614 016, Tamil Nadu, India
| | - K Ravichandran
- PG & Research Department of Physics, AVVM Sri Pushpam College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Poondi, Thanjavur, 613 503, Tamil Nadu, India.
| | - P Kavitha
- PG & Research Department of Zoology and Biotechnology, AVVM Sri Pushpam College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Poondi, Thanjavur, 613 503, Tamil Nadu, India
| | - M Ayyanar
- PG & Research Department of Botany, AVVM Sri Pushpam College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Poondi, Thanjavur, 613 503, Tamil Nadu, India
| | - P K Praseetha
- Department of Nanotechnology, Noorul Islam Centre for Higher Education, Kumaracoil, 629 180, India
| | - N Chidhambaram
- Department of Physics, Rajah Serfoji Government College (Autonomous) [Affiliated to Bharathidasan University, Tiruchirappalli], Thanjavur, 613 005, Tamil Nadu, India
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Dunaway LS, Billaud M, Macal E, Good ME, Medina CB, Lorenz U, Ravichandran K, Koval M, Isakson BE. Amount of Pannexin 1 in Smooth Muscle Cells Regulates Sympathetic Nerve-Induced Vasoconstriction. Hypertension 2023; 80:416-425. [PMID: 36448464 PMCID: PMC9851955 DOI: 10.1161/hypertensionaha.122.20280] [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: 09/07/2022] [Accepted: 11/08/2022] [Indexed: 12/05/2022]
Abstract
BACKGROUND Panx1 (pannexin 1) forms high conductance channels that secrete ATP upon stimulation. The role of Panx1 in mediating constriction in response to direct sympathetic nerve stimulation is not known. Additionally, it is unknown how the expression level of Panx1 in smooth muscle cells (SMCs) influences α-adrenergic responses. We hypothesized that the amount of Panx1 in SMCs dictates the levels of sympathetic constriction and blood pressure. METHODS To test this hypothesis, we used genetically modified mouse models enabling expression of Panx1 in vascular cells to be varied. Electrical field stimulation on isolated arteries and blood pressure were assessed. RESULTS Genetic deletion of SMC Panx1 prevented constriction by electric field stimulation of sympathetic nerves. Conversely, overexpression of Panx1 in SMCs using a ROSA26 transgenic model increased sympathetic nerve-mediated constriction. Connexin 43 hemichannel inhibitors did not alter constriction. Next, we evaluated the effects of altered SMC Panx1 expression on blood pressure. To do this, we created mice combining a global Panx1 deletion, with ROSA26-Panx1 under the control of an inducible SMC specific Cre (Myh11). This resulted in mice that could express only human Panx1, only in SMCs. After tamoxifen, these mice had increased blood pressure that was acutely decreased by the Panx1 inhibitor spironolactone. Control mice genetically devoid of Panx1 did not respond to spironolactone. CONCLUSIONS These data suggest Panx1 in SMCs could regulate the extent of sympathetic nerve constriction and blood pressure. The results also show the feasibility humanized Panx1-mouse models to test pharmacological candidates.
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Affiliation(s)
- Luke S. Dunaway
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22903
| | - Marie Billaud
- Department of Surgery, Division of Thoracic and Cardiac Surgery, Brigham and Women’s Hospital, Boston MA, 02115
| | - Edgar Macal
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22903
| | - Miranda E. Good
- Molecular Cardiology Research Institute, Tufts Medical Center, Boston MA 02111
| | - Christopher B. Medina
- Center for Cell Clearance, University of Virginia School of Medicine, Charlottesville, VA 22903
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia School of Medicine, Charlottesville, VA 22903
| | - Ulrike Lorenz
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia School of Medicine, Charlottesville, VA 22903
- Carter Immunology Center, University of Virginia School of Medicine, Charlottesville, VA 22908
| | - Kodi Ravichandran
- Carter Immunology Center, University of Virginia School of Medicine, Charlottesville, VA 22908
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO
| | - Michael Koval
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322
| | - Brant E Isakson
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA 22903
- Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA 22903
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Ravichandran K, Siva Jyothi N, Thirumurugan K, Suvathi S, Chidhambaram N, Uma R, Sundaresan B. Influence of Mo + F incorporation and point of zero charge on the dye degradation efficacy of ZnO thin films. Chem Phys 2023. [DOI: 10.1016/j.chemphys.2022.111714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ravichandran K, S.A. IYNOONJARIYA, Manivannan N, Badusha MA, Sankara Narayanan TSN. Engineering the surface of titanium to improve its bioactivity and antibacterial activity through a multi-functional coating approach. NEW J CHEM 2023. [DOI: 10.1039/d2nj04485d] [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: 02/19/2023]
Abstract
The present study reports development of multi-functional coatings on titanium for orthopaedic implant application. The multi-functional coating approach involves development of TiO2 nanotubes by anodization followed by dip coating of...
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Periyannan P, Beemarao M, Karthik K., Ponnuswamy S, Ravichandran K. Crystal structure, DFT and Hirshfeld surface analysis of N-acetyl-t-3-methyl-r-2,c-6-diphenylpiperidine. Acta Crystallogr E Crystallogr Commun 2022; 78:179-183. [PMID: 35145747 PMCID: PMC8819451 DOI: 10.1107/s2056989022000275] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 01/07/2022] [Indexed: 11/17/2022]
Abstract
In the title compound, C20H23NO, the piperidine ring adopts a distorted boat conformation, while the phenyl rings subtend a dihedral angle 65.1 (2)°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds into chains extending along the b-axis direction. In the title compound [systematic name: 1-(3-methyl-2,6-diphenylpiperidin-1-yl)ethanone], C20H23NO, the piperidine ring adopts a distorted boat conformation, while the phenyl rings subtend a dihedral angle 65.1 (2)°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds into chains extending along the b-axis direction. The DFT/B3LYP/6–311 G(d,p) method was used to determine the HOMO–LUMO energy levels. A Hirshfeld surface analysis was conducted to verify the contributions of the different intermolecular interactions, indicating that the important contributions to the crystal packing are from H⋯H (73.2%), C⋯H (18.4%) and O⋯H (8.4%) interactions.
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Bhat SK, Ravichandran K, Kanungo R. Rising Minimum Inhibitory Concentration of Azithromycin: A Therapeutic Challenge in Treating Enteric Fever. J Clin Diagn Res 2022. [DOI: 10.7860/jcdr/2022/51989.16059] [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: 11/24/2022]
Abstract
Introduction: Enteric fever continues to be endemic in the Indian subcontinent carrying with it significant morbidity, despite available antibiotics. With changing trends in antibiotic use, concern for emerging resistance to many common pathogens is very common. Taking enteric fever, as a case in point, there is evidence of increased use of azithromycin and thirdgeneration cephalosporins. Documenting evidence of increasing concentrations of antibiotics, required to inhibit the organism, is necessary to alter the prescribing practice and to adopt course correction. This is required to modify antibiotic policies in health care setups both for the management of antibiotic susceptible and resistant cases of enteric fever. Aim: To document the rising Minimum Inhibitory Concentration (MIC) of azithromycin among Salmonella isolates. Materials and Methods: A cross-sectional study was conducted in Pondicherry Institute of Medical Sciences for a period of seven years (January 2014 to December 2020). A total of 168 clinical isolates from enteric fever cases were tested for drug resistance to azithromycin by disk diffusion as per Clinical and Laboratory Standards Institute (CLSI) guidelines. MIC was estimated using the Epsilometer test. Results were interpreted as per CLSI 2020 guidelines. Spearman’s rank correlation coefficient (r) and twotailed p-values were estimated to note the trend. Results: Out of 168 Salmonella isolates, 65 were Salmonella Typhi and 103 were Salmonella Paratyphi A. MIC of these isolates ranged from 1.5-64 µg/mL and three isolates were resistant to azithromycin with MIC ≥32 µg/mL and nine isolates had a high level of MIC of 24 µg/mL. Disc diffusion test results were consistent with MIC of azithromycin against Salmonella isolates from enteric fever. Regression coefficient for MIC for the given value of zone diameter for 65 Salmonella Typhi isolates was -0.579 (p<0.001, considered highly significant) and -0.475 (p<0.01, considered as significant) for Salmonella Paratyphi A isolates. Rising MIC to azithromycin was observed among Salmonella isolates over a period of seven years. Conclusion: There is a need to monitor the rising trend of MIC, which may pose a therapeutic challenge for treating enteric fever cases in near future. Regular MIC estimation can pre-empt overt resistance. Hence, MIC testing should be routinely done where facilities are available than doing only disk diffusion testing for enteric fever isolates.
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Hoste E, Lecomte K, Annusver K, Vandamme N, Roels J, Maschalidi S, Verboom L, Vikkula HK, Sze M, Van Hove L, Verstaen K, Martens A, Hochepied T, Saeys Y, Ravichandran K, Kasper M, van Loo G. OTULIN maintains skin homeostasis by controlling keratinocyte death and stem cell identity. Nat Commun 2021; 12:5913. [PMID: 34625556 PMCID: PMC8501048 DOI: 10.1038/s41467-021-25944-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 09/09/2021] [Indexed: 12/23/2022] Open
Abstract
OTULIN is a deubiquitinase that specifically cleaves linear ubiquitin chains. Here we demonstrate that the ablation of Otulin selectively in keratinocytes causes inflammatory skin lesions that develop into verrucous carcinomas. Genetic deletion of Tnfr1, knockin expression of kinase-inactive Ripk1 or keratinocyte-specific deletion of Fadd and Mlkl completely rescues mice with OTULIN deficiency from dermatitis and tumorigenesis, thereby identifying keratinocyte cell death as the driving force for inflammation. Single-cell RNA-sequencing comparing non-lesional and lesional skin reveals changes in epidermal stem cell identity in OTULIN-deficient keratinocytes prior to substantial immune cell infiltration. Keratinocytes lacking OTULIN display a type-1 interferon and IL-1β response signature, and genetic or pharmacologic inhibition of these cytokines partially inhibits skin inflammation. Finally, expression of a hypomorphic mutant Otulin allele, previously shown to cause OTULIN-related autoinflammatory syndrome in humans, induces a similar inflammatory phenotype, thus supporting the importance of OTULIN for restraining skin inflammation and maintaining immune homeostasis.
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Affiliation(s)
- Esther Hoste
- VIB Center for Inflammation Research, Ghent, Belgium.
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium.
- Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
| | - Kim Lecomte
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Karl Annusver
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Niels Vandamme
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, Ghent, Belgium
| | - Jana Roels
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, Ghent, Belgium
| | - Sophia Maschalidi
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Lien Verboom
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Hanna-Kaisa Vikkula
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Mozes Sze
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Lisette Van Hove
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Kevin Verstaen
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, Ghent, Belgium
| | - Arne Martens
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Tino Hochepied
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Yvan Saeys
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, Ghent, Belgium
| | - Kodi Ravichandran
- VIB Center for Inflammation Research, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
- Center for Cell Clearance and Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, Virginia, USA
| | - Maria Kasper
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Geert van Loo
- VIB Center for Inflammation Research, Ghent, Belgium.
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium.
- Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
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Bakkiyaraj R, Subramanian R, Balakrishnan M, Ravichandran K. Biofabrication of CeO 2 nanoparticles, characterization, photocatalytic, and biological activities. INORG NANO-MET CHEM 2021. [DOI: 10.1080/24701556.2021.1983841] [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: 10/18/2022]
Affiliation(s)
- R. Bakkiyaraj
- Department of Physics, Government College of Engineering, Bargur, Tamil Nadu, India
| | - Ramasamy Subramanian
- PG & Research Department of Chemistry, Sun Arts and Science College, Tiruvannamalai, Tamil Nadu, India
| | - M. Balakrishnan
- PG & Research Department of Physics, Government Arts College, Thiruvannamalai, Tamil Nadu, India
| | - K. Ravichandran
- Materials Science Centre, Department of Nuclear Physics, University of Madras, Chennai, Tamil Nadu, India
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Catrysse L, Maes B, Mehrotra P, Martens A, Hoste E, Martens L, Maueröder C, Remmerie A, Bujko A, Slowicka K, Sze M, Vikkula H, Ghesquière B, Scott CL, Saeys Y, van de Sluis B, Ravichandran K, Janssens S, van Loo G. A20 deficiency in myeloid cells protects mice from diet-induced obesity and insulin resistance due to increased fatty acid metabolism. Cell Rep 2021; 36:109748. [PMID: 34551300 DOI: 10.1016/j.celrep.2021.109748] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 04/04/2021] [Accepted: 09/02/2021] [Indexed: 10/20/2022] Open
Abstract
Obesity-induced inflammation is a major driving force in the development of insulin resistance, type 2 diabetes (T2D), and related metabolic disorders. During obesity, macrophages accumulate in the visceral adipose tissue, creating a low-grade inflammatory environment. Nuclear factor κB (NF-κB) signaling is a central coordinator of inflammatory responses and is tightly regulated by the anti-inflammatory protein A20. Here, we find that myeloid-specific A20-deficient mice are protected from diet-induced obesity and insulin resistance despite an inflammatory environment in their metabolic tissues. Macrophages lacking A20 show impaired mitochondrial respiratory function and metabolize more palmitate both in vitro and in vivo. We hypothesize that A20-deficient macrophages rely more on palmitate oxidation and metabolize the fat present in the diet, resulting in a lean phenotype and protection from metabolic disease. These findings reveal a role for A20 in regulating macrophage immunometabolism.
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Affiliation(s)
- Leen Catrysse
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Bastiaan Maes
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Internal Medicine and Pediatrics, Ghent University, B-9052 Ghent, Belgium
| | - Parul Mehrotra
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Arne Martens
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Esther Hoste
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Liesbet Martens
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Christian Maueröder
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Anneleen Remmerie
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Anna Bujko
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Karolina Slowicka
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Mozes Sze
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Hanna Vikkula
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Bart Ghesquière
- Metabolomics Core Facility, VIB Center for Cancer Biology, VIB, B-3000 Leuven, Belgium
| | - Charlotte L Scott
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Yvan Saeys
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Applied Mathematics, Computer Science and Statistics, Ghent University, B-9052 Ghent, Belgium
| | - Bart van de Sluis
- Department of Pediatrics, Molecular Genetics Section, University of Groningen, University Medical Center Groningen, NL- 9713 Groningen, the Netherlands
| | - Kodi Ravichandran
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium; Center for Cell Clearance and Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, VA, USA
| | - Sophie Janssens
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Internal Medicine and Pediatrics, Ghent University, B-9052 Ghent, Belgium
| | - Geert van Loo
- VIB Center for Inflammation Research, B-9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium.
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Mathew MV, Kumar K PP, Sivaa R, Kuruvilla S, Ravichandran K, Krishnan L. Relationship of Maternal and Neonatal Variables With Breastmilk Sodium. Indian Pediatr 2021; 58:741-744. [PMID: 33772530] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
OBJECTIVE To determine breastmilk sodium changes in the first 72 hours after birth and to correlate maternal and neonatal variables with maternal breastmilk sodium. METHODS We enrolled 245 mothers and their exclusively breast-fed neonates in this prospective cohort study. Singleton, inborn babies of greater than 34 weeks gestation, who were exclusively breastfed for the first 72 hours were included. Babies who required neonatal intensive care unit (NICU) admission, top up feeds or discharged before 72 hours were excluded. Study outcomes were changes in breast milk sodium in the first 72 hours and association of high maternal breast milk sodium with various maternal and neonatal variables. RESULTS Mean (SD) breastmilk sodium steadily declined over the first 72 hours [53.5 (19.2), 38.5 (19.0) and 22.2 (10.6) mmol/L at 24, 48, 72 hours, respectively]. Breastfeeding £8 times per 24 hours in the first three days was the only factor significantly associated with high breastmilk sodium (P=0.008). Maternal age, gravida, mode of delivery, significant neonatal weight loss, hypernatremia, neonatal morbidities like fever, irritability, lethargy and poor suck had no significant correlation with high breastmilk sodium. CONCLUSIONS Breastmilk sodium shows a steady decline in the first 72 hours after delivery. Feeding ≤8 times per day is associated high breastmilk sodium at 72 hours of age.
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Affiliation(s)
- Mary Veena Mathew
- Department of Pediatrics, Pondicherry Institute of Medical Sciences, Puducherry
| | | | - R Sivaa
- Department of Biochemistry, Pondicherry Institute of Medical Sciences, Puducherry
| | - Satish Kuruvilla
- Department of Obstetrics and Gynecology, Pondicherry Institute of Medical Sciences, Puducherry
| | - K Ravichandran
- Department of Statistics, Pondicherry Institute of Medical Sciences, Puducherry
| | - Lalitha Krishnan
- Department of Pediatrics, Pondicherry Institute of Medical Sciences, Puducherry. Correspondence to: Prof Lalitha Krishnan, Head, Departments of Pediatrics, Pondicherry Institute of Medical Sciences, Puducherry 605 014.
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Kumaravelan S, Seshadri S, Suresh R, Ravichandran K, Sathishkumar P, Shanthaseelan K, Suganthi N. Effect of Zn dopant on SnO2 nano-pyramids for photocatalytic degradation. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138352] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Arish BT, Hariharasudhan B, Ranjan RV, Sivakumar S, george SK, Ravichandran K. Anaesthetic Efficacy of Nalbuphine as an Adjuvant to Ropivacaine in Ultrasound Guided Supraclavicular Brachial Plexus Blockade: ARandomised Controlled Trial. J Clin Diagn Res 2021. [DOI: 10.7860/jcdr/2021/47540.14577] [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: 11/24/2022]
Abstract
Introduction: Ultrasonography (USG) guided supraclavicular block is an excellent choice for upper limb surgeries. It not only allows smaller volumes of local anaesthetic usage but also provides optimal tourniquet coverage. Ropivacaine is structurally related to bupivacaine with reduced potential for toxicity and improved sensory and motor blocking profiles. Nalbuphine acquired a significant place in pain control but its efficacy as a local anaesthetic adjuvant is yet to be proved in peripheral nerve blockades. Aim: To evaluate the efficacy of adding nalbuphine to ropivacaine in supraclavicular brachial plexus blockade and to assess the quality of block for patients undergoing ambulatory forearm and hand surgeries. Materials and Methods: Seventy American Society of Anesthesiologists (ASA) grade 1 and 2 patients were randomised into two groups of 35 each. Group A (n=35): received 24 mL of 0.5% of ropivacaine + 1 mL of nalbuphine (10 mg) and Group B (n=35): received 24 mL of 0.5% of ropivacaine + 1 mL of normal saline. The parameters observed were duration of analgesia, onset of sensory and motor blockade, duration of motor blockade and haemodynamic changes during the procedure. Categorical variables were analysed using the Pearson’s Chi‑square test. Continuous variables were analysed using the independent sample t‑test and p<0.05 was considered as statistically significant. Results: The onset of sensory and motor blockades were faster in the nalbuphine group compared to the control group (p<0.001). The duration of sensory and motor blockades was similarly longer in nalbuphine group (p<0.001). Also, the mean duration of analgesia was significantly longer with nalbuphine group (p<0.001). Conclusion: Nalbuphine significantly prolonged the duration of analgesia and duration of block while accelerating the onset of blockade thereby improving the overall quality of blockade.
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Padmanaban H, Simiyon M, Thilakan P, Ravichandran K. Knowledge about confidentiality among medical students from a tertiary care teaching hospital in South India. Indian J Psychiatry 2020; 62:749-750. [PMID: 33896994 PMCID: PMC8052867 DOI: 10.4103/psychiatry.indianjpsychiatry_230_19] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 01/14/2020] [Accepted: 10/23/2020] [Indexed: 11/04/2022] Open
Affiliation(s)
| | - Manjula Simiyon
- Department of Psychiatry, Pondicherry Institute of Medical Sciences, Puducherry, India. E-mail:
| | - Pradeep Thilakan
- Department of Psychiatry, Pondicherry Institute of Medical Sciences, Puducherry, India. E-mail:
| | - K Ravichandran
- Department of Biostatistics, Pondicherry Institute of Medical Sciences, Puducherry, India
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Hoste E, Maueröder C, van Hove L, Catrysse L, Vikkula HK, Sze M, Maes B, Karjosukarso D, Martens L, Gonçalves A, Parthoens E, Roelandt R, Declercq W, Fuentes I, Palisson F, Gonzalez S, Salas-Alanis JC, Boon L, Huebener P, Mulder KW, Ravichandran K, Saeys Y, Schwabe RF, van Loo G. Epithelial HMGB1 Delays Skin Wound Healing and Drives Tumor Initiation by Priming Neutrophils for NET Formation. Cell Rep 2020; 29:2689-2701.e4. [PMID: 31775038 DOI: 10.1016/j.celrep.2019.10.104] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [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: 01/14/2019] [Revised: 09/06/2019] [Accepted: 10/25/2019] [Indexed: 01/03/2023] Open
Abstract
Regenerative responses predispose tissues to tumor formation by largely unknown mechanisms. High-mobility group box 1 (HMGB1) is a danger-associated molecular pattern contributing to inflammatory pathologies. We show that HMGB1 derived from keratinocytes, but not myeloid cells, delays cutaneous wound healing and drives tumor formation. In wounds of mice lacking HMGB1 selectively in keratinocytes, a marked reduction in neutrophil extracellular trap (NET) formation is observed. Pharmacological targeting of HMGB1 or NETs prevents skin tumorigenesis and accelerates wound regeneration. HMGB1-dependent NET formation and skin tumorigenesis is orchestrated by tumor necrosis factor (TNF) and requires RIPK1 kinase activity. NETs are present in the microenvironment of keratinocyte-derived tumors in mice and lesional and tumor skin of patients suffering from recessive dystrophic epidermolysis bullosa, a disease in which skin blistering predisposes to tumorigenesis. We conclude that tumorigenicity of the wound microenvironment depends on epithelial-derived HMGB1 regulating NET formation, thereby establishing a mechanism linking reparative inflammation to tumor initiation.
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Affiliation(s)
- Esther Hoste
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium.
| | - Christian Maueröder
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Lisette van Hove
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Leen Catrysse
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Hanna-Kaisa Vikkula
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Mozes Sze
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Bastiaan Maes
- VIB Center for Inflammation Research, 9052 Ghent, Belgium
| | - Dyah Karjosukarso
- Department of Molecular Developmental Biology, Radboud University, 6525 XZ Nijmegen, the Netherlands
| | - Liesbet Martens
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Amanda Gonçalves
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium; VIB Bio-Imaging Core, 9052 Ghent, Belgium
| | - Eef Parthoens
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium; VIB Bio-Imaging Core, 9052 Ghent, Belgium
| | - Ria Roelandt
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Wim Declercq
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Ignacia Fuentes
- Fundación DEBRA Chile, Santiago, Chile; Centro de Genetica y Genomica, Clinica Allemana, Universidad de Desarrollo, Santiago, Chile
| | - Francis Palisson
- Fundación DEBRA Chile, Santiago, Chile; Facultad de Medicina, Universidad de Desarrollo, Santiago, Chile
| | - Sergio Gonzalez
- Departemento de Patología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Louis Boon
- Bioceros, 3584 CM Utrecht, the Netherlands
| | - Peter Huebener
- Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Klaas Willem Mulder
- Department of Molecular Developmental Biology, Radboud University, 6525 XZ Nijmegen, the Netherlands
| | - Kodi Ravichandran
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium
| | - Yvan Saeys
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Applied Mathematics, Computer Sciences and Statistics, Ghent University, 9052 Ghent, Belgium
| | | | - Geert van Loo
- VIB Center for Inflammation Research, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, 9052 Ghent, Belgium.
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Dhanraj C, Ravichandran K, Kavitha P, Praseetha P. Excess free-electrons activated photocatalytic ability of ZnO films through co-doping of higher oxidation state transition metals Ta and Mo. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107986] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sathiyanarayanan V, Prasath PV, Sekhar PC, Ravichandran K, Easwaramoorthy D, Mohammad F, Al-Lohedan HA, Oh WC, Sagadevan S. Docking and in vitro molecular biology studies of p-anisidine-appended 1-hydroxy-2-acetonapthanone Schiff base lanthanum(iii) complexes. RSC Adv 2020; 10:16457-16472. [PMID: 35692617 PMCID: PMC9122577 DOI: 10.1039/d0ra01936d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 03/27/2020] [Indexed: 12/12/2022] Open
Abstract
A new series of lanthanum(iii) complexes was synthesized using a p-anisidine-appended 1-hydroxy-2-acetonapthanone (3) Schiff base and characterized via spectroscopic methods. The ligand was synthesized via sonication and the crystalline product was characterized using X-ray crystallography. The genotoxicity of the compound was assessed primarily by the bacterial reverse mutation (Ames) test and the in vitro mammalian chromosome aberration test; in both cases, the samarium complex 5 was found to be non-mutagenic. The anti-tumor activity of complexes 4, 5, and 6 was assayed against HeLa tumor cells and screened using the MTT assay. The IC50 value of complex 5 was found to be 34 ± 1.2 μg mL-1 and this compound exhibited superior activity towards the cells compared to 4 and 6. These results were further confirmed by Hoechst 33258 staining and AO/EI dual staining, which indicated that the cells underwent an apoptosis mechanism in a dose-dependent manner. The apoptosis was further confirmed by the formation of ladders in the DNA fragmentation assay, and the western blot analysis of complex 5 suggested that the cells underwent the caspase-3-dependent pathway with PARP cleavage. Furthermore, the docking studies of complex 5 with HSA showed that it was situated in a hydrophilic cavity held by the electrostatic attraction of four hydrogen-bonding interactions. PDB ID:1BNA binds with complex 5via strong π-π stacking interactions, which facilitate binding with the major grooves of DNA strands. The above-mentioned results illustrate that for complex 5, mitochondrion-mediated apoptosis occurs via caspase-3 activation. Complex 5 binds with DNA via intercalation because of S-phase cell cycle arrest in the HeLa cells.
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Affiliation(s)
- V Sathiyanarayanan
- Department of Chemistry, B. S. Abdur Rahman Crescent Institute of Science and Technology Vandalur Chennai 600048 Tamilnadu India .,Department of Analytical Chemistry, Vanta Bioscience Limited, SIPCOT Industrial Complex Gummidipundi Tamilnadu - 601201 India
| | - P Varun Prasath
- Department of Analytical Chemistry, Madras University Guindy Chennai 600 025 Tamil Nadu India
| | - P Chandra Sekhar
- Department of Genetic Toxicology, Palamur Biosciences Pvt Ltd Mahabubnagar 509002 Telangana India.,School of Life Sciences, Manipal University Manipal 576104 Karnataka India
| | - K Ravichandran
- Department of Analytical Chemistry, Madras University Guindy Chennai 600 025 Tamil Nadu India
| | - D Easwaramoorthy
- Department of Chemistry, B. S. Abdur Rahman Crescent Institute of Science and Technology Vandalur Chennai 600048 Tamilnadu India
| | - Faruq Mohammad
- Department of Chemistry, College of Science, King Saud University P. O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia
| | - Hamad A Al-Lohedan
- Department of Chemistry, College of Science, King Saud University P. O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia
| | - Won Chun Oh
- Department of Advanced Materials Science and Engineering, Hanseo University Seosan-si Chungnam 356-706 Korea
| | - Suresh Sagadevan
- Nanotechnology & Catalysis Research Centre, University of Malaya Kuala Lumpur 50603 Malaysia
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20
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Periyannan P, Beemarao M, Karthik K, Ponnuswamy S, Ravichandran K. Crystal structure, Hirshfeld surface analysis and DFT studies of 1-[ r-2, c-6-diphenyl- t-3-(propan-2-yl)piperidin-1-yl]ethan-1-one. Acta Crystallogr E Crystallogr Commun 2020; 76:377-381. [PMID: 32148879 PMCID: PMC7057363 DOI: 10.1107/s2056989020002042] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 02/12/2020] [Indexed: 11/10/2022]
Abstract
In the title compound, C22H27NO, the piperidine ring adopts a chair conformation. The dihedral angles between the mean plane of the piperidine ring and the phenyl rings are 89.78 (7) and 48.30 (8)°. In the crystal, mol-ecules are linked into chains along the b-axis direction by C-H⋯O hydrogen bonds. The DFT/B3LYP/6-311 G(d,p) method was used to determine the HOMO-LUMO energy levels. The mol-ecular electrostatic potential surfaces were investigated by Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyse the inter-molecular inter-actions in the mol-ecule.
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Affiliation(s)
- P. Periyannan
- Department of Physics, Kandaswami Kandar’s College, Velur, Namakkal 638 182, India
| | - M. Beemarao
- Department of Physics, Kandaswami Kandar’s College, Velur, Namakkal 638 182, India
| | - K. Karthik
- PG and Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore 641 018., Tamil Nadu, India
| | - S. Ponnuswamy
- PG and Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore 641 018., Tamil Nadu, India
| | - K. Ravichandran
- Department of Physics, Kandaswami Kandar’s College, Velur, Namakkal 638 182, India
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21
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Narahari AK, Kreutzberger AJ, Leonhardt S, Jin X, Pauchard P, Medina CB, Kiessling V, Ravichandran K, Contreras JE, Tamm LK, Yeager M, Bayliss DA. Permeation Properties of Purified Pannexin 1 Channels in Proteoliposomes. Biophys J 2020. [DOI: 10.1016/j.bpj.2019.11.2362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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22
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Manimohan M, Pugalmani S, Ravichandran K, Sithique MA. Synthesis and characterisation of novel Cu(ii)-anchored biopolymer complexes as reusable materials for the photocatalytic degradation of methylene blue. RSC Adv 2020; 10:18259-18279. [PMID: 35692624 PMCID: PMC9122621 DOI: 10.1039/d0ra01724h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 04/06/2020] [Indexed: 11/21/2022] Open
Abstract
Biopolymer-incorporated Cu(ii) complexes are proven to be excellent photocatalysts for the degradation of organic dyes (methylene blue) under UV-visible light.
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Affiliation(s)
| | | | - K. Ravichandran
- Department of Analytical Chemistry
- University of Madras
- Guindy Campus
- Chennai
- India
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23
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Beemarao M, Silambarasan S, Nasser AJA, Purushothaman M, Ravichandran K. Crystal structure, DFT and Hirshfeld surface analysis of 2-amino-4-(2-chlorophenyl)-7-hydroxy-4 H-benzo[1,2- b]pyran-3-carbonitrile. Acta Crystallogr E Crystallogr Commun 2019; 75:1638-1642. [PMID: 31709082 PMCID: PMC6829740 DOI: 10.1107/s2056989019013537] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 10/03/2019] [Indexed: 11/10/2022]
Abstract
The benzopyran ring of the title compound, C16H11ClN2O2, is planar [maximum deviation = 0.079 (2) Å] and is almost perpendicular to the chlorophenyl ring [dihedral angle = 86.85 (6)°]. In the crystal, N—H...O, O—H...N, C—H...O and C—H...Cl hydrogen bonds form inter- and intramolecular interactions. The DFT/B3LYP/6-311G(d,p) method was used to determine the HOMO–LUMO energy levels. The molecular electrostatic potential surfaces were investigated by Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyse the intermolecular interactions in the molecule.
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Kalaiezhily RK, Asvini V, Saravanan G, Ravichandran K. Excitation-induced tunable luminescence of luminomagnetic Dy and Ce co-doped ZnO nanoparticles. Dalton Trans 2019; 48:12228-12238. [PMID: 31334722 DOI: 10.1039/c9dt01595g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, 1 mol% Dy,Ce co-doped ZnO nanoparticles were synthesized via a simple, cost-effective combustion method which could produce large-scale products. The structure and phase purity of synthesized nanoparticles were shown by X-ray diffraction, selected-area-electron-diffraction patterns and Raman spectroscopy to be a hexagonal wurtzite structure with no secondary peaks. Spherical morphology was shown by field emission scanning electron microscopy and high-resolution transmission electron microscopy. The presence of dopants with elemental composition was authenticated by energy dispersive spectroscopy and elemental mapping. Enhanced reflectance in the visible region for Ce-doped ZnO samples was noted by diffuse reflectance spectroscopy. An increase in the bandgap for doped samples was indicated by the Kubelka-Munk function. Significant visible luminescence was observed, which varied with different excitations. The room-temperature weak ferromagnetic behaviour of 2 mol% Ce-doped ZnO and distinct paramagnetic behaviour of 1 mol% Dy,Ce co-doped ZnO was detected using vibrating sample magnetometry.
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Affiliation(s)
- R K Kalaiezhily
- Department of Nuclear Physics, University of Madras, Chennai 600 025, India.
| | - V Asvini
- Department of Nuclear Physics, University of Madras, Chennai 600 025, India.
| | - G Saravanan
- Department of Nuclear Physics, University of Madras, Chennai 600 025, India.
| | - K Ravichandran
- Department of Nuclear Physics, University of Madras, Chennai 600 025, India.
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Srinivasan S, Manikandan S, Govindaswamy D, Ravichandran K. A Modulation Technique for Sensorless Control of Switched Reluctance Motor. DEFENCE SCI J 2019. [DOI: 10.14429/dsj.69.14409] [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: 11/13/2022]
Abstract
The switched reluctance motor (SRM) uniquely bears several merits with respect to other motor configurations. Especially, the construction of the rotor is simple in the sense that it neither contains copper not contains permanent magnets. Because of this construction, likelihood of rotor’s failure is less than the other motor configurations. This makes this motor more suitable for harsh environments. On the flip side, this motor cannot directly operate with AC or DC power source and needs electronic commutation. For commutation, the information on instantaneous orientation of the rotor is essential. Since inclusion of appropriate sensor adds to the cost and complexity of the system, sensor-less commutation of SRM gained interest among the researchers and has been studied extensively in literature. The techniques for sensorless control of SRM can be broadly classified into Active phase and Idle phase techniques. Idle phase techniques are generally believed to be not suitable for high speed operation beause of tail current in a phase, i.e., because of inductive nature of the phase, it takes time for flow of current to stop. This paper proposes a novel idle phase technique that is conducive for high speed operation of switched reluctance motor.
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Ravichandran K, McCaffrey C, Grifo J, Morales A, Perloe M, Munne S, Wells D, Fragouli E. Corrigendum. Mitochondrial DNA quantification as a tool for embryo viability assessment: retrospective analysis of data from single euploid blastocyst transfers. Hum Reprod 2019; 34:781. [DOI: 10.1093/humrep/dez013] [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] [Received: 02/01/2019] [Indexed: 11/13/2022] Open
Affiliation(s)
- K Ravichandran
- Reprogenetics, A Cooper Surgical Company, 3 Regent Street, Livingston, NJ, USA
| | - C McCaffrey
- NYU Langone Medical Center, 333 E 38th Street, New York, MY, USA
| | - J Grifo
- NYU Langone Medical Center, 333 E 38th Street, New York, MY, USA
| | - A Morales
- Fertility Specialists Medical Group, 8010 Frost Street, San Diego, CA, USA
| | - M Perloe
- Georgia Reproductive Specialists, 5445 Meridian Mark Road, Altanta, GA, USA
| | - S Munne
- Reprogenetics, A Cooper Surgical Company, 3 Regent Street, Livingston, NJ, USA
| | - D Wells
- Reprogenetics UK, Institute for Reproductive Sciences, Oxford Business Park North, Oxford, UK
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - E Fragouli
- Reprogenetics UK, Institute for Reproductive Sciences, Oxford Business Park North, Oxford, UK
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, UK
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Ravikumar K, Sudakaran SV, Ravichandran K, Pulimi M, Natarajan C, Mukherjee A. Green synthesis of NiFe nano particles using Punica granatum peel extract for tetracycline removal. Journal of Cleaner Production 2019; 210:767-776. [DOI: 10.1016/j.jclepro.2018.11.108] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
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Lett JA, Sundareswari M, Ravichandran K, Latha MB, Sagadevan S, Bin Johan MR. Tailoring the morphological features of sol–gel synthesized mesoporous hydroxyapatite using fatty acids as an organic modifier. RSC Adv 2019; 9:6228-6240. [PMID: 35517282 PMCID: PMC9060915 DOI: 10.1039/c9ra00051h] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 02/05/2019] [Indexed: 11/21/2022] Open
Abstract
Nowadays, owing to their large surface area, enhanced pore volume, increased porosity, and variable pore size, mesoporous materials, such as mesoporous silica and mesoporous carbon, have attracted significant attention in the areas of physical science and biomedical sciences. Due to their compositional and biological similarities to natural tissues, synthetic nanoscaled mesoporous hydroxyapatite (MPHA) nanoparticles possess good biocompatibility, bioactivity, and osteoconductivity and have recently expanded their applicability in a wide range of fields such as in tissue replacement, drug/gene delivery carriers, and biocompatible coatings. In this study, we defined a novel route to synthesize mesoporous hydroxyapatite nanoparticles by the sol–gel method in the presence of stearic acid (SA), a biocompatible medium chain fatty acid that would function as an organic modifier. The as-prepared HAP particles were subjected to structural, functional and morphological characterization. Mesopores in HAP were observed for samples synthesized at pH 11 by removing the organic template. The porosity of HAP was confirmed by the Brunauer–Emmett–Teller (BET) analysis. The apatite deposition phenomenon in simulated body fluid at pH 7.4 confirms their in vitro bioactivity, and based on the in vitro cytotoxicity examined using Vero cell cultures, the as-prepared HAP particles exhibit excellent cytocompatibility and cell viability as high as 83% at an extract concentration as low as 25%. Moreover, the loading and leaching behavior of the drug in mesoporous HAP was studied using methionine (MT), an essential amino acid. These results confirm that nano mesoporous hydroxyapatite loaded with MT can be a potential aspirant as a biomaterial in biomedical applications. Nowadays, owing to their large surface area, enhanced pore volume, increased porosity, and variable pore size, mesoporous materials, such as mesoporous silica and mesoporous carbon, have attracted significant attention in the areas of physical science and biomedical sciences.![]()
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Affiliation(s)
- J. Anita Lett
- Department of Physics
- Sathyabama Institute of Science and Technology
- Chennai-600119
- India
| | - M. Sundareswari
- Department of Physics
- Sathyabama Institute of Science and Technology
- Chennai-600119
- India
| | - K. Ravichandran
- Department of Analytical Chemistry
- University of Madras
- Chennai-600025
- India
| | - M. Bavani Latha
- Department of Biotechnology
- Sathyabama Institute of Science and Technology
- Chennai-600119
- India
| | - Suresh Sagadevan
- Nanotechnology & Catalysis Research Centre
- University of Malaya
- Kuala Lumpur 50603
- Malaysia
| | - Mohd. Rafie Bin Johan
- Nanotechnology & Catalysis Research Centre
- University of Malaya
- Kuala Lumpur 50603
- Malaysia
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Vijayalakshmi RV, Kannan A, Kumar PP, Ravichandran K, Rajakumar P. Effect of stabilizing agents on the conductivity of Co@TiO2
core–shell nanoparticles. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.nanoso.2018.07.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Dheivamalar S, Sugi L, Ravichandran K, Sriram S. Adsorption of alanine with heteroatom substituted fullerene for solar cell application: A DFT study. Spectrochim Acta A Mol Biomol Spectrosc 2018; 202:333-345. [PMID: 29800898 DOI: 10.1016/j.saa.2018.05.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 05/01/2018] [Accepted: 05/09/2018] [Indexed: 06/08/2023]
Abstract
C20 is the most important fullerene cage and alanine is the simplest representation of a backbone unit of the protein. The absorption feasibility of alanine molecule in the Si-doped C20 and B-doped C20 fullerenes has been studied based on calculated electronic properties of fullerenes using density functional theory (DFT). In this work, we explore the ability of Si-doped C20, B-doped C20 fullerene to interact with alanine at the DFT-B3LYP/6-31G, RHF level of theory. We find that noticeable structural change takes place in C20 when one of its carbon is substituted with Si or B. The molecular geometry, electronic properties and vibrational analysis have also been performed on the title compounds. The NMR study reveals the aromaticity of the pure and doped fullerene compounds. Stability of the doped fullerene - alanine compound arises from hyper conjugative interactions. It leads to one of the major property of bioactivity, charge transfer and delocalization of charge and this properties has been analyzed using Natural Bond Orbital (NBO) analysis. The energy gap of the doped fullerene reveals that there is a decrease in the size of energy gap significantly, making them more reactive as compared to C20 fullerene. Theoretical studies of the electronic spectra by using time - dependent density functional theory (TD-DFT) method were helpful to interpret the observed electronic transition state. We aim to optimize the performance of the solar cells by altering the frontier orbital energy gaps. Considering all studied properties, it may be inferred that the applicability of C20 fullerene as the non-linear optical (NLO) material and its NLO property would increase on doping fullerene with Si and B atom. Specifically C19Si would be better among them.
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Affiliation(s)
- S Dheivamalar
- Department of Physics, Periyar E.V.R College, Trichy, Tamil Nadu, India.
| | - L Sugi
- Department of Physics, Periyar E.V.R College, Trichy, Tamil Nadu, India
| | - K Ravichandran
- Department of Physics, AVVM Sri Pushpam College, Poondi, Thanjavur, Tamil Nadu, India
| | - S Sriram
- School of Electrical and Electronics Engineering, Sastra University, Tanjavur, Tamil Nadu, India
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Ravichandran K, Ranjith S, Sankari S, Beemarao M, Ponnuswamy MN. 4-(4-Chlorophenyl)-1,2,3-selenadiazole. IUCr Data 2018. [DOI: 10.1107/s2414314618004625] [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: 11/10/2022] Open
Abstract
In the title compound, C8H5ClN2Se, the dihedral angle between the planes of the selenadiazole and chlorophenyl rings is 16.6 (2)°. In the crystal, the packing of the molecules is consolidated by weak C—H...N hydrogen bonds, which generate [001] chains, and π–π stacking interactions are observed between the phenyl and selenadiazole rings, with a centroid–centroid distance of 3.884 (2) Å. There is also a short Se...Cl contact of 3.468 (1) Å
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Ravichandran K, McCaffrey C, Grifo J, Morales A, Perloe M, Munne S, Wells D, Fragouli E. Mitochondrial DNA quantification as a tool for embryo viability assessment: retrospective analysis of data from single euploid blastocyst transfers. Hum Reprod 2018; 32:1282-1292. [PMID: 28387858 DOI: 10.1093/humrep/dex070] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [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: 01/11/2017] [Accepted: 03/17/2017] [Indexed: 11/13/2022] Open
Abstract
STUDY QUESTION Does the amount of mitochondrial DNA (mtDNA) in blastocyst biopsy specimens have the potential to serve as a biomarker of euploid embryo implantation ability, independent of morphology? SUMMARY ANSWER The results of this study strongly suggest that elevated mtDNA levels, above a previously defined threshold, are strongly associated with blastocyst implantation failure and represent an independent biomarker of embryo viability. WHAT IS KNOWN ALREADY Improved methods of embryo selection are highly desirable in order to increase the efficiency of IVF treatment. At present, even the transfer of chromosomally normal embryos of high morphological grade cannot guarantee that a pregnancy will follow. Recently, it has been proposed that the quantity of mtDNA in embryonic cells may be an indicator of developmental potential, with higher levels of mtDNA associated with reduced implantation. However, thus far reported data sets have been relatively small and in some cases have lacked appropriate validation. STUDY DESIGN, SIZE, DURATION This large, blinded, retrospective study involved the analysis of relative mtDNA levels in 1505 euploid blastocysts obtained from 490 couples undergoing preimplantation genetic testing for aneuploidy. Implantation outcomes were compared to mtDNA levels in order to determine the capacity of the method to predict viability and to assess the validity of previously established thresholds. PARTICIPANTS/MATERIALS, SETTING, METHODS DNA from blastocyst biopsy samples was amplified and then subjected to aneuploidy analysis using next generation sequencing or array comparative genomic hybridization. Only those embryos classified as chromosomally normal had their mtDNA levels assessed. This analysis was undertaken retrospectively using quantitative real-time PCR, without knowledge of the outcome of embryo transfer. Predictions of implantation failure, based upon mtDNA levels were subsequently compared to the observed clinical results. All cycles involved the transfer of a single embryo. MAIN RESULTS AND THE ROLE OF CHANCE Of all blastocysts analyzed, 9.2% (139/1505) contained mtDNA levels above a previously established viability threshold and were therefore predicted to have reduced chances of implantation. To the date of analysis, 282 euploid blastocysts had been transferred with an overall implantation rate of 65.6% (185/282). Of the transferred embryos, 249 contained levels of mtDNA in the normal range, 185 of which produced a pregnancy, giving an implantation rate of 74.3% for euploid embryos with 'normal' quantities of mtDNA. However, 33 of the transferred embryos were determined to have elevated mtDNA quantities. None of these led to a pregnancy. Therefore, the negative predictive value of mtDNA assessment in this cohort was 100% (33/33). The difference between the implantation rates for embryos with normal and elevated mtDNA levels was highly significant (P < 0.0001). The mtDNA thresholds, used for classification of embryos, were unaffected by female age or the clinic in which the IVF was undertaken. The probability of an embryo having elevated levels of mtDNA was not influenced by variation in embryo morphology. LIMITATIONS, REASONS FOR CAUTION This study provides strong evidence that mtDNA quantification can serve as a valuable tool to assist the evaluation of blastocyst viability. However, to determine the true extent of any clinical benefits, other types of investigations, such as non-selection studies and randomized controlled trials, will also be necessary. WIDER IMPLICATIONS OF THE FINDINGS The results of this study suggest that mtDNA quantity can serve as an independent biomarker for the prediction of euploid blastocyst implantation potential. Prospective studies should now be undertaken to confirm these results. Additionally, investigations into the underlying biological cause(s) of elevated mtDNA levels and an enhanced understanding of how they relate to diminished implantation potential would be invaluable. STUDY FUNDING/COMPETING INTEREST(S) This study was supported by funding provided by Reprogenetics. None of the authors have any competing interests.
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Affiliation(s)
- K Ravichandran
- Reprogenetics, A Cooper Surgical Company, 3 Regent Street, Livingston, NJ 07039, USA
| | - C McCaffrey
- NYU Langone Medical Center, 333 E 38th Street, New York, NY 10016, USA
| | - J Grifo
- NYU Langone Medical Center, 333 E 38th Street, New York, NY 10016, USA
| | - A Morales
- Fertility Specialists Medical Group, 8010 Frost Street, San Diego, CA 92123, USA
| | - M Perloe
- Georgia Reproductive Specialists, 5445 Meridian Mark Road, Atlanta, GA 30342, USA
| | - S Munne
- Reprogenetics, A Cooper Surgical Company, 3 Regent Street, Livingston, NJ 07039, USA
| | - D Wells
- Reprogenetics UK, Institute for Reproductive Sciences, Oxford Business Park North, Oxford OX4 2HW, UK.,Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK
| | - E Fragouli
- Reprogenetics UK, Institute for Reproductive Sciences, Oxford Business Park North, Oxford OX4 2HW, UK.,Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK
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Ragavan P, T.S. R, Ravichandran K, R.S.C J, K S, Saxena A, P.M M. Note on identity and distribution of Cynometra iripa Kostel. and C. ramiflora L. (Fabaceae) in the Andaman and Nicobar Islands, India. CheckList 2017. [DOI: 10.15560/13.6.805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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35
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Gomathi M, Rajkumar P, Prakasam A, Ravichandran K. Green synthesis of silver nanoparticles using Datura stramonium leaf extract and assessment of their antibacterial activity. Resource-Efficient Technologies 2017. [DOI: 10.1016/j.reffit.2016.12.005] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gnanasekaran L, Hemamalini R, Saravanan R, Ravichandran K, Gracia F, Agarwal S, Gupta VK. Synthesis and characterization of metal oxides (CeO 2 , CuO, NiO, Mn 3 O 4 , SnO 2 and ZnO) nanoparticles as photo catalysts for degradation of textile dyes. Journal of Photochemistry and Photobiology B: Biology 2017; 173:43-49. [DOI: 10.1016/j.jphotobiol.2017.05.027] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 05/18/2017] [Accepted: 05/19/2017] [Indexed: 11/16/2022]
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37
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Alimunnisa J, Ravichandran K, Meena K. Synthesis and characterization of Ag@SiO 2 core-shell nanoparticles for antibacterial and environmental applications. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.103] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Penberthy KK, Buckley MW, Arandjelovic S, Ravichandran K. Ex vivo modulation of the Foxo1 phosphorylation state does not lead to dysfunction of T regulatory cells. PLoS One 2017; 12:e0173386. [PMID: 28267764 PMCID: PMC5340387 DOI: 10.1371/journal.pone.0173386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 02/20/2017] [Indexed: 12/17/2022] Open
Abstract
Peripheral regulatory CD4+ T cells (Treg cells) prevent maladaptive inflammatory responses to innocuous foreign antigens. Treg cell dysfunction has been linked to many inflammatory diseases, including allergic airway inflammation. Glucocorticoids that are used to treat allergic airway inflammation and asthma are thought to work in part by promoting Treg cell differentiation; patients who are refractory to these drugs have defective induction of anti-inflammatory Treg cells. Previous observations suggest that Treg cells deficient in the transcription factor FoxO1 are pro-inflammatory, and that FoxO1 activity is regulated by its phosphorylation status and nuclear localization. Here, we asked whether altering the phosphorylation state of FoxO1 through modulation of a regulatory phosphatase might affect Treg cell function. In a mouse model of house dust mite-induced allergic airway inflammation, we observed robust recruitment of Treg cells to the lungs and lymph nodes of diseased mice, without an apparent increase in the Treg cytokine interleukin-10 in the airways. Intriguingly, expression of PP2A, a serine/threonine phosphatase linked to the regulation of FoxO1 phosphorylation, was decreased in the mediastinal lymph nodes of HDM-treated mice, mirroring the decreased PP2A expression seen in peripheral blood monocytes of glucocorticoid-resistant asthmatic patients. When we asked whether modulation of PP2A activity alters Treg cell function via treatment with the PP2A inhibitor okadaic acid, we observed increased phosphorylation of FoxO1 and decreased nuclear localization. However, dysregulation of FoxO1 did not impair Treg cell differentiation ex vivo or cause Treg cells to adopt a pro-inflammatory phenotype. Moreover, inhibition of PP2A activity did not affect the suppressive function of Treg cells ex vivo. Collectively, these data suggest that modulation of the phosphorylation state of FoxO1 via PP2A inhibition does not modify Treg cell function ex vivo. Our data also highlight the caveat in using ex vivo assays of Treg cell differentiation and function, in that while these assays are useful, they may not fully recapitulate Treg cell phenotypes that are observed in vivo.
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Affiliation(s)
- Kristen Kelley Penberthy
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Center for Cell Clearance, University of Virginia, Charlottesville, Virginia, United States of America
- Carter Immunology Center, University of Virginia, Charlottesville, Virginia, United States of America
| | - Monica Weaver Buckley
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Center for Cell Clearance, University of Virginia, Charlottesville, Virginia, United States of America
- Carter Immunology Center, University of Virginia, Charlottesville, Virginia, United States of America
| | - Sanja Arandjelovic
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Center for Cell Clearance, University of Virginia, Charlottesville, Virginia, United States of America
- Carter Immunology Center, University of Virginia, Charlottesville, Virginia, United States of America
| | - Kodi Ravichandran
- Department of Microbiology, Immunology and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Center for Cell Clearance, University of Virginia, Charlottesville, Virginia, United States of America
- Carter Immunology Center, University of Virginia, Charlottesville, Virginia, United States of America
- * E-mail:
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Nanda SK, Bharathy M, Dinakaran A, Ray L, Ravichandran K. Correlation of Friedewald's calculated low-density lipoprotein cholesterol levels with direct low-density lipoprotein cholesterol levels in a tertiary care hospital. Int J Appl Basic Med Res 2017; 7:57-62. [PMID: 28251110 PMCID: PMC5327609 DOI: 10.4103/2229-516x.198525] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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] [Indexed: 01/26/2023] Open
Abstract
Background: One of the risk factors for the development of coronary heart disease is high low-density lipoprotein (LDL) cholesterol levels. National Cholesterol Education Program ATP III guidelines suggest drug therapy to be considered at LDL-cholesterol levels >130 mg/dl. This makes accurate reporting of LDL cholesterol crucial in the management of Coronary heart disease. Estimation of LDL cholesterol by direct LDL method is accurate, but it is expensive. Hence, We compared Friedewald's calculated LDL values with direct LDL values. Aim: To evaluate the correlation of Friedewalds calculated LDL with direct LDL method. Materials and Methods: We compared LDL cholesterol measured by Friedewald's formula with direct LDL method in 248 samples between the age group of 20–70 years. Paired t-test was used to test the difference in LDL concentration obtained by a direct method and Friedewald's formula. The level of significance was taken as P < 0.05. Pearsons correlation formula was used to test the correlation between direct LDL values with Friedewald's formula. Results: There was no significant difference between the direct LDL values when compared to calculated LDL by Friedewalds formula (P = 0.140). Pearson correlation showed there exists good correlation between direct LDL versus Friedewalds formula (correlation coefficient = 0.98). The correlation between direct LDL versus Friedewalds calculated LDL was best at triglycerides values between 101 and 200 mg/dl. Conclusion: This study indicates calculated LDL by Friedewalds equation can be used instead of direct LDL in patients who cannot afford direct LDL method.
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Affiliation(s)
- Sunil Kumar Nanda
- Department of Biochemistry, Pondicherry Institute of Medical Sciences, Affiliated to Pondicherry University, Puducherry, India
| | - M Bharathy
- Department of Biochemistry, Pondicherry Institute of Medical Sciences, Affiliated to Pondicherry University, Puducherry, India
| | - Asha Dinakaran
- Department of Biochemistry, Pondicherry Institute of Medical Sciences, Affiliated to Pondicherry University, Puducherry, India
| | - Lopamudra Ray
- Department of Biochemistry, Pondicherry Institute of Medical Sciences, Affiliated to Pondicherry University, Puducherry, India
| | - K Ravichandran
- Department of Biostatistics, Pondicherry Institute of Medical Sciences, Affiliated to Pondicherry University, Puducherry, India
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Rosenfeld J, Kung A, Ravichandran K, Yeboah E, Goodall N, Barbieri E, Coates A, Mounts E, Fragouli E, Munne S. Quantitative relationship between mitochondrial DNA (MTDNA) amounts and implantation can help improve pregnancy outcomes. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Fragouli E, Ravichandran K, Munne S, Grifo J, McCaffrey C, Wells D. Clinical application of mitochondrial DNA quantification for embryo viability assessment: a blinded prospective non-selection study. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ragavan P, Saxena A, Mohan P, Jeyaraj R, Ravichandran K. The rediscovery of Brownlowia tersa (L.) Kosterm. (Malvaceae), from the Andaman Islands, India — a Near Threatened mangrove species. cl 2016. [DOI: 10.1016/0029-554x(65)90430-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Brownlowia tersa, described by C.E. Parkinson from the Andaman Islands during the 1920s, was never recollected. The present report concerns its recent collection from North Andaman and Middle Andaman Islands with updated nomenclature, detailed description and distribution notes. It is considered a near threatened species due to habitat loss.
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Ragavan P, Saxena A, Mohan P, Jeyaraj R, Ravichandran K. The rediscovery of Brownlowia tersa (L.) Kosterm. (Malvaceae), from the Andaman Islands, India — a Near Threatened mangrove species. cl 2016. [DOI: 10.15560/12.3.1897] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Brownlowia tersa, described by C.E. Parkinson from the Andaman Islands during the 1920s, was never recollected. The present report concerns its recent collection from North Andaman and Middle Andaman Islands with updated nomenclature, detailed description and distribution notes. It is considered a near threatened species due to habitat loss.
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Ramachandran K, Kalpana D, Sathishkumar Y, Lee YS, Ravichandran K, kumar GG. A facile green synthesis of silver nanoparticles using Piper betle biomass and its catalytic activity toward sensitive and selective nitrite detection. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2015.10.033] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ravichandran K, Chidhambaram N, Arun T, Velmathi S, Gobalakrishnan S. Realizing cost-effective ZnO:Sr nanoparticles@graphene nanospreads for improved photocatalytic and antibacterial activities. RSC Adv 2016. [DOI: 10.1039/c6ra08697g] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Ravichandran K, Subha K, Manivasaham A, Sridharan M, Arun T, Ravidhas C. Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications. RSC Adv 2016. [DOI: 10.1039/c6ra10268a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A triple layer system (TaZO/Ag/TaZO), consisting of tantalum doped zinc oxide (TaZO) as the top and bottom layers and metallic silver (Ag) as the intermediate layer, was deposited onto glass substrates.
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Affiliation(s)
- K. Ravichandran
- Materials Science Research Laboratory
- PG and Research Department of Physics
- AVVM Sri Pushpam College (Autonomous)
- Thanjavur-613 503
- India
| | - K. Subha
- Materials Science Research Laboratory
- PG and Research Department of Physics
- AVVM Sri Pushpam College (Autonomous)
- Thanjavur-613 503
- India
| | - A. Manivasaham
- Materials Science Research Laboratory
- PG and Research Department of Physics
- AVVM Sri Pushpam College (Autonomous)
- Thanjavur-613 503
- India
| | - M. Sridharan
- Functional Nanomaterials and Devices Laboratory
- Centre for Nanotechnology & Advanced Biomaterials
- School of Electrical and Electronics Engineering
- SASTRA University
- Thanjavur-613 401
| | - T. Arun
- Institute of Physics
- Bhubaneswar
- India
| | - C. Ravidhas
- PG & Research Department of Physics
- Bishop Heber College (Autonomous)
- Tiruchirappalli 620017
- India
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Bhat KS, Devi S, Ramya SR, Ravichandran K, Kanungo R. Self-directed learning to enhance active learning among the 2nd-year undergraduate medical students in Microbiology: An experimental study. J Curr Res Sci Med 2016. [DOI: 10.4103/2455-3069.198379] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Anita Lett J, Sundareswari M, Ravichandran K. Porous hydroxyapatite scaffolds for orthopedic and dental applications - the role of binders. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.matpr.2016.04.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fernando RJ, Ravichandran K, Vaz M. Aerobic Fitness, Heart Rate Recovery and Heart Rate Recovery Time in Indian School Children. Indian J Physiol Pharmacol 2015; 59:407-413. [PMID: 27530008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Data on aerobic fitness and heart rate recovery in children are limited. This study was done to evaluate the relation between them in Indian school going children. Three hundred children of 7 to 10.5 years were recruited and their aerobic fitness was predicted using modified Harvard's step test (VO₂max) and 20 meter shuttle test (VO₂peak). The heart rate was monitored for 12 minutes post modified Harvard's step test. The difference between the maximum and the 1st minute HR was noted as HRR1 and the time taken to reach the resting heart rate was also recorded. VO₂max was inversely correlated with HRR1 (r = -0.64, p<0.001). However, the partial correlation of the two was not significant (r(partial) = -0.037, p = 0.55), indicating children with higher basal HR had higher HRR1 and that accounted for the observed association with aerobic fitness. Cox regression analysis showed that the recovery rate per unit time was 3% greater with increasing VO₂max (HR = 1.03, 95% CI:1.01 to 1.05, p = 0.013). The heart rate parameters did not show any associat with VO₂peak This study demonstrates that there is no relation between VO₂max and HRR1 after 3 minutes of modified Harvard's step test in Indian children of 7 to 10.5 years. However, aerobic fitness is a positive predictor of heart rate recovery time in this group.
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Wells D, Ravichandran K, Alper M, Jain J, Penzias A, Benadiva C, Colls P, Konstantinidis M, Munne S. Aneuploidy rates in embryos produced by fertile couples. Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2015.07.960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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