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Chaudhary V, Walia GK, Devi NK, Shekhawat LS, Saraswathy KN. Adverse childhood experiences in mental health of young adults: An exploratory study from Delhi-NCR, India. Int J Soc Psychiatry 2024; 70:445-456. [PMID: 38063051 DOI: 10.1177/00207640231214986] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
BACKGROUND Despite the growing realization regarding the importance of adverse childhood experiences (ACEs) in adult health outcomes, this area of research has received little scientific attention in low- and middle-income countries, including India. AIMS To understand the overall and domain-specific association of exposure to ACEs with current depression, anxiety, stress, and well-being among young adults of Delhi-NCR. METHODS This cross-sectional study was carried out among 1,812 young adults (aged 18-25 years) of both sexes (68.7% females). Fieldwork was conducted on the campuses of the University of Delhi, Delhi, and Amity University, Noida, India. ACEs, depression, anxiety, stress, and well-being were screened using the Adverse Childhood Experiences International Questionnaire, Beck Depression Inventory-II, Beck Anxiety Inventory, Perceived Stress Scale, and WHO-5 Well-Being Index, respectively. RESULTS Exposure to ACEs was found to increase the odds of moderate/severe depression, moderate/severe anxiety, and high stress and decreased the odds of good well-being in a dose-response manner. Being bullied, followed by emotional abuse, was associated with the highest odds of current moderate/severe depression, moderate/severe anxiety, and high stress and the lowest odds of good well-being. Further, while several domains of household dysfunction showed poor association with studied mental health outcomes, domains of abuse and violence were more consistently associated. CONCLUSIONS The present study revealed the detrimental impact of ACEs on mental health outcomes among young adults of Delhi-NCR, India, and underscored the relevance of ACEs in the Indian context. Considering the lack of trauma awareness in Indian societies, there is an urgent need to create widespread awareness regarding ACEs and associated health implications.
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Affiliation(s)
| | | | | | - Lokesh Singh Shekhawat
- Department of Psychiatry, Atal Bihari Vajpayee Institute of Medical Sciences and Dr. Ram Manohar Lohia Hospital, Delhi, India
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Chaudhary V, Bhattacharjee D, Devi NK, Saraswathy KN. Global DNA Methylation Levels Viz-a-Viz Genetic and Biochemical Variations in One Carbon Metabolic Pathway: An Exploratory Study from North India. Biochem Genet 2024:10.1007/s10528-023-10659-4. [PMID: 38356009 DOI: 10.1007/s10528-023-10659-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 12/29/2023] [Indexed: 02/16/2024]
Abstract
Despite the importance of one carbon metabolic pathway (OCMP) in modulating the DNA methylation process, only a few population-based studies have explored their relationship among healthy individuals. This study aimed to understand the variations in global DNA methylation levels with respect to selected genetic (CBS 844ins68, MTRR A66G, MTR A2756G, and MTHFR C677T polymorphisms) and biochemical (folate, vitamin B12, and homocysteine) markers associated with OCMP among healthy North Indian adults. The study has been conducted among 1095 individuals of either sex (69.5% females), aged 30-75 years. A sample of 5 mL of blood was collected from each participant. Homocysteine, folate, and vitamin B12 levels were determined using the chemiluminescence technique. Restriction digestion was performed for genotyping MTRR A66G, MTR A2756G, and MTHFR C677T polymorphisms and allele-specific PCR amplification for CBS 844ins68 polymorphism. Global DNA methylation levels were analyzed using ELISA-based colorimetric technique. Of the selected genetic and biochemical markers, the mutant MTRR A66G allele was positively associated with global DNA methylation levels. Further, advanced age was inversely associated with methylation levels. MTRR 66GG genotype group was hypermethylated than other genotypes in folate replete and vitamin B12 deficient group (a condition prevalent among vegetarians), suggesting that the G allele may be more efficient than the wild-type allele in such conditions. Global DNA methylation levels appeared to be more influenced by genetic than biochemical factors. MTRR 66G allele may have a selective advantage in vitamin B12 deficient conditions. Further research should be undertaken to understand how genetics affects epigenetic processes.
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Affiliation(s)
- Vineet Chaudhary
- Department of Anthropology, University of Delhi, Delhi, 110007, India
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Kaushik A, Chaudhary V, Longkumer I, Saraswathy KN, Jain S. Sex-specific variations in global DNA methylation levels with age: a population-based exploratory study from North India. Front Genet 2023; 14:1038529. [PMID: 37255712 PMCID: PMC10225692 DOI: 10.3389/fgene.2023.1038529] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 05/03/2023] [Indexed: 06/01/2023] Open
Abstract
Purpose: Aging is one of the most important risk factors for a number of human diseases. Epigenetic alterations, including changes in DNA methylation patterns, have been reported to be one of the hallmarks of aging. Being a malleable process, the role of site-specific DNA methylation in aging is being extensively investigated; however, much less attention has been given to alterations in global DNA methylation with aging at the population level. The present study aims to explore overall and sex-specific variations in global DNA methylation patterns with age. Methods: A total of 1,127 adult individuals (792 females) aged 30-75 years belonging to Haryana, North India, were recruited. Socio-demographic data was collected using a pretested interview schedule. Global DNA methylation analysis, of peripheral blood leucocyte (PBL) DNA, was performed using the ELISA-based colorimetric technique. Results: Though the overall correlation analysis revealed a weak inverse trend between global DNA methylation and age, the adjusted regression model showed no significant association between global DNA methylation and age. In age-stratified analysis, global DNA methylation levels were found to be fairly stable until 60 years of age, followed by a decline in the above-60 age group. Further, no significant difference in DNA patterns methylation pattern was observed between males and females. Conclusion: Overall, the study suggests a lack of association between global DNA methylation and age, especially until 60 years of age, and a similar DNA methylation pattern between males and females with respect to age.
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Affiliation(s)
- Anshika Kaushik
- Laboratory of Molecular and Biochemical Anthropology, Department of Anthropology, University of Delhi, Delhi, India
| | - Vineet Chaudhary
- Laboratory of Molecular and Biochemical Anthropology, Department of Anthropology, University of Delhi, Delhi, India
| | - Imnameren Longkumer
- Laboratory of Molecular and Biochemical Anthropology, Department of Anthropology, University of Delhi, Delhi, India
| | | | - Sonal Jain
- Laboratory of Molecular and Biochemical Anthropology, Department of Anthropology, University of Delhi, Delhi, India
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Khate K, Chaudhary V, Longkumer I, Saraswathy KN, Devi NK. Gender-specific association of blood lipids and reproductive trajectory with cognitive impairment: A community based cross-sectional study from India. Front Psychol 2023; 14:1107152. [PMID: 36923148 PMCID: PMC10008908 DOI: 10.3389/fpsyg.2023.1107152] [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: 12/12/2022] [Accepted: 02/08/2023] [Indexed: 03/01/2023] Open
Abstract
Background Abnormal blood lipid levels in the general population and adverse reproductive events among women have been associated with cognitive impairment (CI). However, their relationship has not been extensively studied in community settings. Hence, this study aims to explore the association of CI with blood lipid levels in both sexes and reproductive events/trajectory among women. Methods A cross-sectional study was conducted among a North Indian rural population. A total of 808 adults were recruited through door-to-door household survey. Data on socio-demographic variables, reproductive profile of women, and cognitive impairment status were collected. Fasting blood sample was collected to estimate serum lipid profile. Multivariate logistic regression was performed to test for association. Results The study demonstrated a lack of association between lipid profile and cognitive impairment among males. Surprisingly, low HDL-C among females was found to be protective against moderate/severe cognitive impairment (value of p = 0.049). Further, menopausal women and those having five or higher live births were found to be at higher risk of CI than pre-menopausal women and those with 1-2 live births, respectively. Conclusion The present study hints toward a gender-specific association of blood lipid levels with CI. Further, higher live births and menopause appear to be important risk factors for CI among women.
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Affiliation(s)
- Kevingu Khate
- Department of Anthropology, University of Delhi, New Delhi, India
| | - Vineet Chaudhary
- Department of Anthropology, University of Delhi, New Delhi, India
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Rajkumari S, Chaudhary V, Kasaudhan S, Saraswathy KN. Incidence and determinants of hysterectomy among North Indian women: An 8-year follow-up study. Front Public Health 2022; 10:1065081. [PMID: 36589953 PMCID: PMC9800844 DOI: 10.3389/fpubh.2022.1065081] [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: 10/09/2022] [Accepted: 11/29/2022] [Indexed: 12/23/2022] Open
Abstract
Background Despite indications of a rapid increase in the number of hysterectomies performed in India, very few studies have methodically investigated the rate and determinants of the incidence of hysterectomy. The present study aims to estimate the rate of incidence of hysterectomy and identify predictors/determinants of incident hysterectomy in a cohort of North Indian women. Methods In the present study, a cohort of 1,009 ever-married North Indian women (aged 30-75 years) was followed up after a median of 8.11 years. Those hysterectomized at the baseline (63) were excluded; and of the rest 946 participants, 702 (74.2%) could be successfully followed-up. During the baseline assessment, data about sociodemographic variables, reproductive history, menopausal status, physiological health, and selected blood biochemicals were collected. During the end-line assessment, data about sociodemographic variables, current menopausal status, and incident hysterectomy were recorded. Results The overall rate of incidence of hysterectomy was found to be 11.59 per 1,000 women-years, in the study population. Interestingly, the incidence rates were found to be similar among pre- and post-menopausal women. Further, while late age at menarche was found to be negatively associated with incident hysterectomy, folate repletion and high triglyceride (TG) at the baseline were found to be positively associated. Conclusions High rate of incident hysterectomy in the studied population points toward the huge burden of gynecological morbidity and the unavailability of non-invasive protocols. Such a situation warrants immediate policy intervention. Further, maintaining TG and folate within normal physiological ranges may be beneficial in gynecological ailments necessitating hysterectomy.
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Zdeg I, Al‐Shami A, Tiouichi G, Absike H, Chaudhary V, Neugebauer P, Nouneh K, Belhboub A, Mounkachi O, El Fatimy A. Electrical Transport Properties of Layered Black Phosphorus grown by Chemical Vapor Transport. Cryst Res Technol 2022. [DOI: 10.1002/crat.202200164] [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] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- I. Zdeg
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
- Complex Systems and Interactions Ecole Centrale Casablanca Bouskoura, Ville Verte Casablanca 27182 Morocco
| | - A. Al‐Shami
- Laboratory of Condensed Matter and Interdisciplinary Sciences LaMCScI, Faculty of Sciences Mohammed V University of Rabat Benguerir 43150 Morocco
| | - G. Tiouichi
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
- MSDA Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
| | - H. Absike
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
| | - V. Chaudhary
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
- MSDA Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
| | - P. Neugebauer
- Central European Institute of Technology CEITEC BUT Purkyňova 656/123 Brno 61200 Czech Republic
| | - K. Nouneh
- Laboratory of Material Physics and Subatomic Ibn Tofail University BP 242 Kenitra 14000 Morocco
| | - A. Belhboub
- Complex Systems and Interactions Ecole Centrale Casablanca Bouskoura, Ville Verte Casablanca 27182 Morocco
| | - O. Mounkachi
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
- Laboratory of Condensed Matter and Interdisciplinary Sciences LaMCScI, Faculty of Sciences Mohammed V University of Rabat Benguerir 43150 Morocco
- MSDA Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
| | - A. El Fatimy
- Institute of Applied Physics Mohammed VI Polytechnic University Lot 660, Hay Moulay Rachid Ben Guerir Benguerir 43150 Morocco
- Central European Institute of Technology CEITEC BUT Purkyňova 656/123 Brno 61200 Czech Republic
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Yadav N, Chaudhary V, Saraswathy KN, Devi NK. Vitamin intake in obesity and hypertension: A population-based study from Haryana, North India. Clinical Epidemiology and Global Health 2022. [DOI: 10.1016/j.cegh.2022.101178] [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: 11/09/2022] Open
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Chaudhary V, Saraswathy KN, Sarwal R. Dietary diversity as a sustainable approach towards micronutrient deficiencies in India. Indian J Med Res 2022; 156:31-45. [PMID: 36510896 PMCID: PMC9903373 DOI: 10.4103/ijmr.ijmr_3314_21] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The silent epidemic of micronutrient deficiencies (MNDs) continues to be a major public health challenge in the developing world, including India. The prevalence of iron, iodine, zinc, vitamin A and folate deficiencies is alarmingly high worldwide. India is additionally facing a high prevalence of vitamin D and B12 deficiencies. To combat the hidden epidemic of MNDs, various governments around the world have mostly relied on supplementation or fortification-based interventions. India launched salt iodization programme in 1962 and vitamin A and iron-folate supplementation programmes in 1970. Yet, even after decades of these programmes, MNDs are still widespread in the country. Due to slow progress in alleviating the burden of most MNDs, the Government of India aims to scale up fortification-based intervention programmes. However, there are safety and effectiveness concerns with such approaches. Hence, overdependence on supplementation and fortification alone may be counterproductive. Instead, food based dietary diversification approach can be the way forward. In this article, we list the common MNDs in India, evaluate major policy interventions, discuss concerns pertaining to fortification and suggest the need for a concurrent food-based approach, in particular dietary diversification, as a long-term and sustainable strategy to address population-based MNDs.
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Affiliation(s)
| | | | - Rakesh Sarwal
- National Minorities Development and Finance Corporation, Delhi, India,For correspondence: Dr Rakesh Sarwal, National Minorities Development and Finance Corporation, Delhi 110 092, India e-mail:
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Tan LP, Chaudhary V, Tsakadze Z, Ramanujan RV. Rapid multiple property determination from bulk materials libraries prepared from chemically synthesized powders. Sci Rep 2022; 12:9504. [PMID: 35680980 PMCID: PMC9184742 DOI: 10.1038/s41598-022-13691-3] [Citation(s) in RCA: 1] [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: 04/08/2022] [Accepted: 05/26/2022] [Indexed: 11/12/2022] Open
Abstract
A variety of high-performance materials are utilized in electrical, electronic, and mechanical systems. Such systems account for a significant fraction of the world’s electricity consumption. The next generation of such systems urgently require new material compositions which possess a better combination of both structural and functional properties. Only accelerated methodologies can rapidly determine the required multiple property set. Hence, a range of iron–cobalt–nickel ternary alloy composition powders were chemically synthesized. Compositionally graded bulk materials libraries were prepared by spark plasma sintering of these powders. A multiple property set of the crystal structure, magnetic, mechanical, and electrical properties were determined for a range of compositions. This property set revealed that a good combination of magnetic and mechanical properties can be obtained from Fe50Co40Ni10, high electrical resistivity from Fe54Co17Ni29 and high saturation magnetization as well as high hardness from Fe57Co29Ni14. Thus, this multiple property library, developed by accelerated methodologies, can be utilized to identify new ternary compositions satisfying diverse property sets relevant to next generation systems.
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Affiliation(s)
- Li Ping Tan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - V Chaudhary
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Z Tsakadze
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - R V Ramanujan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
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Chaudhary V, Longkumer I, Kaur G, Saraswathy KN. Gender-specific association of biochemical variables with depression: a population-based case-control study from North India. Middle East Curr Psychiatry 2022. [DOI: 10.1186/s43045-022-00187-z] [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
Abstract
Background
Depression is a highly prevalent mental disorder with complex aetiology. An emerging body of evidence shows that depression tends to co-occur with abnormal blood glucose levels and dyslipidaemia. This study aimed to understand the overall and gender-specific associations of abnormal glucose levels and dyslipidaemia with depression in a single Mendelian population from rural Haryana, India. To achieve the aim, a population-based case-control study, which constituted of 251 depressed (cases) and 251 non-depressed (controls) individuals, was set up. The study was conducted among the Jat community of Palwal District, Haryana (North India). Data collection was done using a pre-tested interview schedule through the household survey method. Depression status was ascertained using Beck Depression Inventory-II. Fasting blood glucose analysis and lipid profiling were done using commercial kits (Randox, USA) through spectrophotometry. Statistical analysis was done using MS-Excel 2010 and SPSS version 16.0.
Results
In the present study, overall fasting blood sugar level was not found to be associated with depression. However, high blood sugar posed a 3.6-folds elevated risk for depression among females with borderline significance (p = 0.058). Further, higher levels of TC and LDL were found to be inversely associated with depression. In the sex-wise analysis inverse association of TC and LDL with depression remained significant among males but not among females. Instead, high TG and high VLDL showed an increased risk for depression in females.
Conclusions
This study suggests gender-specific associations of some of the studied biochemical variables with depression. Longitudinal studies are warranted to explicate cause-effect relationships between the studied biochemical variables and depression.
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Shah S, Dubey J, Chaudhary V, Chawla R. Workstation peril: Paradoxical inability to ventilate in manual/spontaneous mode with mechanical ventilation modes unaffected. Indian J Anaesth 2022; 66:612-614. [PMID: 36274807 PMCID: PMC9580594 DOI: 10.4103/ija.ija_243_22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 07/27/2022] [Accepted: 08/03/2022] [Indexed: 11/04/2022] Open
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Abstract
Superior passive cooling technologies are urgently required to tackle device overheating, consequent performance degradation, and service life reduction. Magnetic cooling, governed by the thermomagnetic convection of a ferrofluid, is a promising emerging passive heat transfer technology to meet these challenges. Hence, we studied the performance metrics, non-dimensional parameters, and thermomagnetic cooling performance of various ferrite and metal-based ferrofluids. The magnetic pressure, friction factor, power transfer, and exergy loss were determined to predict the performance of such cooling devices. We also investigated the significance of the magnetic properties of the nanoparticles used in the ferrofluid on cooling performance. γ-Fe2O3, Fe3O4, and CoFe2O4 nanoparticles exhibited superior cooling performance among ferrite-based ferrofluids. FeCo nanoparticles had the best cooling performance for the case of metallic ferrofluids. The saturation magnetization of the magnetic nanoparticles is found to be a significant parameter to enhance heat transfer and heat load cooling. These results can be used to select the optimum magnetic nanoparticle-based ferrofluid for a specific magnetic cooling device application.
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Affiliation(s)
- M. S. Pattanaik
- grid.59025.3b0000 0001 2224 0361School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore ,grid.499358.aSingapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore, 138602 Singapore
| | - V. B. Varma
- grid.59025.3b0000 0001 2224 0361School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore ,grid.499358.aSingapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore, 138602 Singapore
| | - S. K. Cheekati
- grid.59025.3b0000 0001 2224 0361School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore ,grid.499358.aSingapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore, 138602 Singapore
| | - V. Chaudhary
- grid.59025.3b0000 0001 2224 0361School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore
| | - R. V. Ramanujan
- grid.59025.3b0000 0001 2224 0361School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore ,grid.499358.aSingapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore, 138602 Singapore
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Boucher MC, Qian J, Brent MH, Wong DT, Sheidow T, Duval R, Kherani A, Dookeran R, Maberley D, Samad A, Chaudhary V. Evidence-based Canadian guidelines for tele-retina screening for diabetic retinopathy: recommendations from the Canadian Retina Research Network (CR2N) Tele-Retina Steering Committee. Can J Ophthalmol 2021; 55:14-24. [PMID: 32089161 DOI: 10.1016/j.jcjo.2020.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/27/2019] [Accepted: 01/02/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this report is to develop a consensus for Canadian national guidelines specific to a tele-medicine approach to screening for diabetic retinopathy (DR) using evidence-based and clinical data. METHODS Canadian Tele-Screening Grading Scales for DR and diabetic macular edema (DME) were created primarily based on severity grading scales outlined by the International Clinical Diabetic Retinopathy Disease Severity Scale (ICDR) and the Scottish DR Grading Scheme 2007. Other grading scales used in international screening programs and the clinical expertise of the Canadian Retina Research Network members and retina specialists nationwide were also used in the creation of the guidelines. RESULTS National Tele-Screening Guidelines for DR and DME with and without optical coherence tomography (OCT) images are proposed. These outline a diagnosis and management algorithm for patients presenting with different stages of DR and/or DME. General guidelines detailing the requirements for imaged retina fields, image quality, quality control, and follow-up care and the role of visual acuity, pupil dilation, OCT, ultra-wide-field imaging, and artificial intelligence are discussed. CONCLUSIONS Tele-retina screening can help to address the need for timely and effective screening for DR, whose prevalence continues to rise. A standardized and evidence-based national approach to DR tele-screening has been proposed, based on DR/DME grading using two 45° image fields or a single widefield or ultra-wide-field image, preferable use of OCT imaging, and a focus on local quality control measures.
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Affiliation(s)
- M C Boucher
- Centre universitaire d'ophtalmologie (CUO)-Hôpital Maisonneuve-Rosemont, Département d'ophtalmologie, Université de Montréal, Montréal, Qué
| | - J Qian
- Hamilton Regional Eye Institute, St. Joseph's Healthcare Hamilton, Division of Ophthalmology, Department of Surgery, McMaster University, Hamilton, Ont.; Department of Ophthalmology & Vision Sciences, University of Toronto, Toronto, Ont
| | - M H Brent
- Department of Ophthalmology & Vision Sciences, University of Toronto, Toronto, Ont.; Department of Ophthalmology, University Health Network-Donald K. Johnson Eye Institute, Toronto Western Hospital, Toronto, Ont
| | - D T Wong
- Department of Ophthalmology & Vision Sciences, University of Toronto, Toronto, Ont.; Department of Ophthalmology, Unity Health Toronto-St. Michael's Hospital, Toronto, Ont
| | - T Sheidow
- Department of Ophthalmology, Ivey Eye Institute-St. Joseph's Hospital, London, Ont
| | - R Duval
- Centre universitaire d'ophtalmologie (CUO)-Hôpital Maisonneuve-Rosemont, Département d'ophtalmologie, Université de Montréal, Montréal, Qué
| | - A Kherani
- Southern Alberta Eye Center, Calgary Retina Consultants, Calgary, Alta
| | - R Dookeran
- Misericordia Health Centre, University of Manitoba, Winnipeg, Man
| | - D Maberley
- Department of Ophthalmology & Visual Sciences, Eye Care Centre-Vancouver General Hospital, Vancouver, B.C
| | - A Samad
- Department of Ophthalmology & Visual Sciences, Dalhousie University, Halifax, N.S
| | - V Chaudhary
- Hamilton Regional Eye Institute, St. Joseph's Healthcare Hamilton, Division of Ophthalmology, Department of Surgery, McMaster University, Hamilton, Ont..
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Panwar H, Rokana N, Aparna SV, Kaur J, Singh A, Singh J, Singh KS, Chaudhary V, Puniya AK. Gastrointestinal stress as innate defence against microbial attack. J Appl Microbiol 2020; 130:1035-1061. [PMID: 32869386 DOI: 10.1111/jam.14836] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 05/30/2020] [Revised: 08/09/2020] [Accepted: 08/21/2020] [Indexed: 12/13/2022]
Abstract
The human gastrointestinal (GI) tract has been bestowed with the most difficult task of protecting the underlying biological compartments from the resident commensal flora and the potential pathogens in transit through the GI tract. It has a unique environment in which several defence tactics are at play while maintaining homeostasis and health. The GI tract shows myriad number of environmental extremes, which includes pH variations, anaerobic conditions, nutrient limitations, elevated osmolarity etc., which puts a check to colonization and growth of nonfriendly microbial strains. The GI tract acts as a highly selective barrier/platform for ingested food and is the primary playground for balance between the resident and uninvited organisms. This review focuses on antimicrobial defense mechanisms of different sections of human GI tract. In addition, the protective mechanisms used by microbes to combat the human GI defence systems are also discussed. The ability to survive this innate defence mechanism determines the capability of probiotic or pathogen strains to confer health benefits or induce clinical events respectively.
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Affiliation(s)
- H Panwar
- Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - N Rokana
- Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - S V Aparna
- Department of Dairy Microbiology, College of Dairy Science and Technology, Kerala Veterinary and Animal Science University, Mannuthy, Thrissur, India
| | - J Kaur
- Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - A Singh
- Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - J Singh
- Department of Dairy Microbiology, College of Dairy Science and Technology, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - K S Singh
- Structure and Function of Proteins, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - V Chaudhary
- Department of Microbiology, Punjab Agriculture University, Ludhiana, Punjab, India
| | - A K Puniya
- Dairy Microbiology Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India
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Bond C, Johnson J, Chaudhary V, McCarthy E, McWhorter M, Woehrle N. Perinatal fluoxetine exposure results in social deficits and reduced monoamine oxidase gene expression in mice. Brain Res 2020; 1727:146282. [DOI: 10.1016/j.brainres.2019.06.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 05/28/2019] [Accepted: 06/01/2019] [Indexed: 12/27/2022]
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16
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Kumar S, Gupta K, Murali T, Dharma K, Anand A, Bhandare M, Chaudhary V, Shrikhande S. Pattern of gastric cancer in young(GCY): A retrospective study from a tertiary cancer care centre in Indian subcontinent. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy432.019] [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: 11/13/2022] Open
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Zhong Y, Chaudhary V, Tan X, Parmar H, Ramanujan RV. Mechanochemical synthesis of high coercivity Nd 2(Fe,Co) 14B magnetic particles. Nanoscale 2017; 9:18651-18660. [PMID: 28905064 DOI: 10.1039/c7nr04703g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
With increasing demand for magnets in energy conversion systems, the quest for the development and understanding of novel processing routes to produce permanent magnets has become urgent. We report a novel mechanochemical process for the synthesis of Nd2(Fe,Co)14B magnetic particles with a high coercivity of 12.4 kOe. This process involves the reduction of neodymium oxide, iron oxide, cobalt oxide and boron anhydride in the presence of a calcium reducing agent and a CaO diluent. The formation mechanism of Nd2(Fe,Co)14B changed with increasing CaO content, and the average crystal size of the Nd2(Fe,Co)14B particles also increased, resulting in an increase in the coercivity values. The reaction mechanism during milling was revealed through a study of the phase transformations as a function of milling time. It was found that unlike self-propagating reactions, this reduction reaction during milling requires continuous input of mechanical energy to reach a steady state.
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Affiliation(s)
- Y Zhong
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
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Parmar H, Xiao T, Chaudhary V, Zhong Y, Ramanujan RV. High energy product chemically synthesized exchange coupled Nd 2Fe 14B/α-Fe magnetic powders. Nanoscale 2017; 9:13956-13966. [PMID: 28920126 DOI: 10.1039/c7nr02348k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The excellent hard magnetic properties of Nd2Fe14B based magnets have an enormous range of technological applications. Exchange-coupled Nd2Fe14B/α-Fe magnets were chemically synthesized by a microwave assisted combustion process to produce mixed oxides, followed by a reduction diffusion process to form magnetic nano-composite powder. This synthesis technique offers an inexpensive and facile platform to produce exchange coupled hard magnets. The size dependent magnetic properties were investigated. The formation mechanisms of the oxide powders and the reduction diffusion mechanism were identified. The microwave power was found to play a crucial role in determining the crystallite size. The coercivity of the powder increased with increasing particle size. Room temperature coercivity (Hc) values greater than 9 kOe and magnetization of 110 emu g-1 was obtained in particles with a mean size of ∼62 nm. An energy product of 5.2 MGOe was obtained, which is the highest reported value for chemically synthesized hard magnetic Nd2Fe14B/α-Fe powders.
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Affiliation(s)
- Harshida Parmar
- Rolls-Royce@NTU Corporate Lab, Nanyang Technological University, 639798, Singapore
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Rana J, Gulati S, Rajasekharan S, Gupta A, Chaudhary V, Gupta S. Identification of potential molecular associations between chikungunya virus non-structural protein 2 and human host proteins. Acta Virol 2017; 61:39-47. [PMID: 28105853 DOI: 10.4149/av_2017_01_39] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Chikungunya virus (CHIKV) non-structural protein 2 (nsP2) is considered to be the master regulator of viral RNA replication and host responses generated during viral infection. This protein has two main functional domains: an N-terminal domain which exhibits NTPase, RNA triphosphatase and helicase activities and a C-terminal protease domain. Understanding how CHIKV nsP2 interacts with its host proteins is essential for elucidating all the required processes for viral replication and pathogenesis along with the identification of potential targets for antiviral therapy. In current study yeast two-hybrid (Y2H) screening of a human fetal brain cDNA library was performed using nsP2 protein as bait. The analysis identified seven host proteins (CCDC130, CPNE6, POLR2C, MAPK9, EIF4A2, EEF1A1 and EIF3I) as putative interactors of CHIKV nsP2 which were selected for further analysis based on their roles in host cellular machinery. The gene ontology analysis indicates that these proteins are mainly involved in apoptosis, transcription and translational mechanism of host cell. Domain mapping of nsP2 revealed that these associations are not random connections but instead they have functional significance. Further studies to identify the amino acid residues and their chemical interactions that may help in opening new possibilities for preventing these interactions, thus reducing chances of chikungunya infection were performed. This study expands the understanding of CHIKV-host interactions and is important for rational approaches of discovering new antiviral agents.
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Ray A, Chaudhary V, Wang ZP, Ramanujan RV. Surfactant Free Room Temperature Synthesis of Iron Oxide Magnetic Nanoparticles in Microchannels. j nanofluids 2016. [DOI: 10.1166/jon.2016.1287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chavan VR, Chaudhary V, Ahir P, Mehta R, Mavani PS, Kerkar C, Pramanik JM. Current scenario of opportunistic and co-infections in HIV-infected individuals at a tertiary care hospital in Mumbai, India. Indian J Med Microbiol 2016; 33:78-83. [PMID: 25560006 DOI: 10.4103/0255-0857.148386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
PURPOSE An update on opportunistic infections/co-infections (OIs/CIs) is essential to understand the success of highly active antiretroviral therapy offered by the government agencies in reducing AIDS-related OIs/CIs. Hence, the present study aimed to evaluate the frequency of OIs/CIs in HIV-positive individuals at a tertiary care hospital in Mumbai. Its' association with CD4 counts, anti-retroviral treatment and on HIV transmission was also determined. MATERIALS AND METHODS An observational study was designed to evaluate different OIs/CIs in individuals, who tested positive for HIV infection at the ICTC/Shakti Clinic of Seth G.S. Medical College and KEM Hospital, Mumbai. Data analysis was done with the use of SPSS software (version 19.0, SPSS, Chicago, IL, USA). P value was considered significant if it is < 0.05. RESULTS Heterosexual contact was the major route of transmission among the enrolled 185 individuals. Ninety (48.06%) HIV-infected individuals were with OIs/CIs. Tuberculosis (TB) was the most common OI (68.8%). Other CIs noted were Herpes zoster, syphilis, hepatitis C and B, malaria, typhoid and dengue. The median CD4 count in HIV-positive individuals with TB was 337 ± 248 cells/μl, and 67.7% of individuals with OIs/CIs had low CD4 counts (<400 cells/μl). Individuals in 31-40 years of age group had significantly (P = 0.01) more OIs/CIs. More (53.7%) spouse/children of HIV-positive individuals without OIs/CIs were HIV-1 positive. Low proportions of individuals with or without OIs/CIs were on ART. CONCLUSION Nearly half of HIV-infected individuals were with OIs/CIs. Initiation of free ART programme since 2004 possibly associated with the type and rate of OIs/CIs. Tuberculosis and multiple OIs/CIs were associated with low CD4 counts. Infection was high in 31-40 years age group. Most of the spouses of individuals without OIs/CIs were HIV positive, indirectly indicates lack of condom use or lack of awareness of condom use.
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Affiliation(s)
| | | | | | | | | | | | - J M Pramanik
- Department of Infectious Diseases Biology , National Institute for Research in Reproductive Health, Parel, Mumbai, Maharashtra, India
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Patil VM, Noronha V, Joshi A, Krishna VM, Dhumal S, Chaudhary V, Juvekar S, Pai PS, Pankaj C, Chaukar D, Dcruz AK, Prabhash K. Referral pattern for neoadjuvant chemotherapy in the head and neck cancers in a tertiary care center. Indian J Cancer 2014; 51:100-3. [PMID: 25104187 DOI: 10.4103/0019-509x.137956] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Use of any treatment modality in cancer depends not only on the effectiveness of the modality, but also on other factors such as local expertise, tolerance of the modality, cost and prevalence of the disease. Oropharyngeal and laryngeal cancer are the major subsites in which majority of neoadjuvant chemotherapy (NACT) literature in the head and neck cancers is available. However, oral cancers form a major subsite in India. MATERIALS AND METHODS This is an analysis of a prospectively maintained data on NACT in the head and neck cancers from 2008 to 2012. All these patients were referred for NACT for various indications from a multidisciplinary clinic. Descriptive analysis of indications for NACT in this data base is presented. RESULTS A total of 862 patients received NACT within the stipulated time period. The sites where oral cavity 721 patients (83.6%), maxilla 41 patients (4.8%), larynx 33 patients (3.8%), laryngopharynx 8 patients (0.9%) and hypopharynx 59 patients (8.2%). Out of oral cancers, the major indication for NACT was to make the cancer resectable in all (100%) patients. The indication in carcinoma of maxilla was to make the disease resectable in 29 patients (70.7% of maxillary cancers) and in 12 patients (29.3% of maxillary cancers) it was given as an attempt to preserve the eyeball. The indication for NACT in laryngeal cancers was organ preservation in 14 patients (42.4% of larnyngeal cancer) and to achieve resectability in 19 patients (57.6% of larnyngeal cancer). The group with laryngopharynx is a cohort of eight patients in whom NACT was given to prevent tracheostomy, these patients had presented with early stridor (common terminology criteria for adverse events Version 4.02). The reason for NACT in hypopharyngeal cancers was for organ preservation in 24 patients (40.7% of hypopharyngeal cancer) and for achievement of resectability in 35 patients (59.3% of hypopharyngeal cancer). CONCLUSION The major indication for NACT is to make disease resectable at our center while cases for organ preservation are few.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - K Prabhash
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
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Rana SS, Dhaliwal HS, Sharma V, Chaudhary V, Bhasin DK. Pancreatic stent eroding into the stomach. Endoscopy 2014; 45 Suppl 2 UCTN:E361-2. [PMID: 24285048 DOI: 10.1055/s-0033-1344774] [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] [Indexed: 12/10/2022]
Affiliation(s)
- S S Rana
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
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Affiliation(s)
- S S Rana
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
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Abstract
Every day we hear more and more about free radicals and how they are linked with innumerable diseases and health conditions from ageing to muscular degeneration and even some forms of cancer. The problem is not in knowing that these microscopic enemies exist. We know that they do! The problem is how to fight them so that they are rendered harmless. Under normal metabolic conditions each cell of human body is exposed to about 1010 molecules of superoxide anions (primary free radical) each day. For a person weighing 150 pounds, this amounts to about 4 pounds of superoxide per year, a substantial amount! Once formed, superoxide can react through catalytic pathways in the cell to form many other reactive oxygen/nitrogen species (ROS/RNS). The antioxidant defense system in the human body is extensive and consists of multiple layers, which protect against different types of ROS/RNS. Many of the biological effects of antioxidants appear to be related to their ability not only to scavenge the deleterious free radicals but also to modulate cell signalling pathways. Nepal Journal of Medical Sciences | Volume 02 | Number 02 | July-December 2013 | Page 171-180 DOI: http://dx.doi.org/10.3126/njms.v2i2.8971
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Affiliation(s)
- S S Rana
- Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
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Noble J, Chaudhary V. Ranibizumab and the eye. CMAJ 2011; 183:822. [DOI: 10.1503/cmaj.090574] [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: 11/01/2022] Open
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Bakhtiari M, Malhotra H, Jones MD, Chaudhary V, Walters JP, Nazareth D. Applying graphics processor units to Monte Carlo dose calculation in radiation therapy. J Med Phys 2010; 35:120-2. [PMID: 20589122 PMCID: PMC2884304 DOI: 10.4103/0971-6203.62198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 10/05/2009] [Revised: 11/03/2009] [Accepted: 11/14/2009] [Indexed: 11/05/2022] Open
Abstract
We investigate the potential in using of using a graphics processor unit (GPU) for Monte-Carlo (MC)-based radiation dose calculations. The percent depth dose (PDD) of photons in a medium with known absorption and scattering coefficients is computed using a MC simulation running on both a standard CPU and a GPU. We demonstrate that the GPU's capability for massive parallel processing provides a significant acceleration in the MC calculation, and offers a significant advantage for distributed stochastic simulations on a single computer. Harnessing this potential of GPUs will help in the early adoption of MC for routine planning in a clinical environment.
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Affiliation(s)
- M. Bakhtiari
- Department of Radiation Medicine, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - H. Malhotra
- Department of Radiation Medicine, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - M. D. Jones
- Department of Physics and Center for Computational Research, University at Buffalo, SUNY, Buffalo, NY 14260, USA
| | - V. Chaudhary
- Computer Science and Engineering, University at Buffalo, SUNY, Buffalo, NY 14260, USA
| | - J. P. Walters
- Computer Science and Engineering, University at Buffalo, SUNY, Buffalo, NY 14260, USA
| | - D. Nazareth
- Department of Radiation Medicine, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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Prasanna R, Sood A, Jaiswal P, Nayak S, Gupta V, Chaudhary V, Joshi M, Natarajan C. Rediscovering cyanobacteria as valuable sources of bioactive compounds (Review). APPL BIOCHEM MICRO+ 2010. [DOI: 10.1134/s0003683810020018] [Citation(s) in RCA: 83] [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: 11/23/2022]
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Prasanna R, Sood A, Jaiswal P, Nayak S, Gupta V, Chaudhary V, Joshi M, Natarajan C. Rediscovering cyanobacteria as valuable sources of bioactive compounds. Prikl Biokhim Mikrobiol 2010; 46:133-147. [PMID: 20391755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Cyanobacteria are a simple, but primitive and diverse group of microorganisms, with characteristics in common to both bacteria and algae. Their success as a group in a wide range of habitats has been attributed to their unique physiological characters and high adaptive ability under a wide range of environmental conditions. The potential of cyanobacteria as a source of a variety of compounds such as polysaccharides, lipids, proteins, vitamins, sterols, enzymes, pharmaceuticals and other fine chemicals is well recognized, and their demand is now on an increasing trend. This compilation reviews the salient advances in the discovery of bioactive compounds from cyanobacteria and their significance in agriculture and industry.
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Affiliation(s)
- R Prasanna
- Division of Microbiology & Centre for Conservation and Utilization of Blue-Green Algae Indian Agricultural Research Institute, New Delhi 110012, India.
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Srivastava S, Yadav A, Seem K, Mishra S, Chaudhary V, Nautiyal CS. Effect of high temperature on Pseudomonas putida NBRI0987 biofilm formation and expression of stress sigma factor RpoS. Curr Microbiol 2008; 56:453-7. [PMID: 18219523 DOI: 10.1007/s00284-008-9105-0] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2007] [Accepted: 11/26/2007] [Indexed: 11/26/2022]
Abstract
Pseudomonas is an efficient plant growth-promoting rhizobacteria; however, among the limiting factors for its commercialization, tolerance for high temperature is the most critical one. After screening 2,500 Pseudomnas sp. strains, a high temperature tolerant-strain Pseudomonas putida NBRI0987 was isolated from the drought-exposed rhizosphere of chickpea (Cicer arietinum L. cv. Radhey), which was grown under rain-fed conditions. P. putida NBRI0987 tolerated a temperature of 40 degrees C for < or = 5 days. To the best of our knowledge, this is the first report of a Pseudomnas sp. demonstrating survival estimated by counting viable cells under such a high temperature. P. putida NBRI0987 colony-forming unit (CFU)/ml on day 10 in both the absence and presence of MgSO4 x 7H2O (MgSO4) in combination with glycerol at 40 degrees C were 0.0 and 1.7 x 10(11), respectively. MgSO4 plus glycerol also enhanced the ability of P. putida NBRI0987 to tolerate high temperatures by inducing its ability to form biofilm. However, production of alginate was not critical for biofilm formation. The present study demonstrates overexpression of stress sigma factor sigma(S) (RpoS) when P. putida NBRI0987 is grown under high-temperature stress at 40 degrees C compared with 30 degrees C. We present evidence, albeit indirect, that the adaptation of P. putida NBRI0987 to high temperatures is a complex multilevel regulatory process in which many different genes can be involved.
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Affiliation(s)
- S Srivastava
- Division of Plant Microbe Interactions, National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, India
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Mandal B, Jain RK, Chaudhary V, Varma A. First Report of Natural Infection of Luffa acutangula by Watermelon bud necrosis virus in India. Plant Dis 2003; 87:598. [PMID: 30812967 DOI: 10.1094/pdis.2003.87.5.598c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In August 2002, ridge gourd (Luffa acutangula) plant samples exhibiting yellowing of leaves were collected from the experimental farm of Tamil Nadu Agricultural University, Coimbatore, India. Mechanical inoculations of ridge gourd seedlings using the above samples resulted in chlorotic spots on inoculated leaves and vein clearing followed by chlorotic rings and yellow netting along veins of newly developed leaves. The virus was reisolated from the chlorotic spots of the seedlings. Extracts from the field samples as well as mechanically inoculated seedlings reacted with antiserum to Watermelon silver mottle virus (WSMoV) in direct antigen coating enzyme-linked immunosorbent assay, suggesting the association of a tospovirus belonging to WSMoV serogroup (2). Symptomatic leaves from the second mechanical passage exhibiting yellow netting along the veins were subjected to reverse transcription-polymerase chain reaction (1) to identify the genus Tospovirus. Using the primer pair (5'TCTGTCCT(C/T) TTGAA (G/T) GTCCA3' and 5'AGAGCAATCGAGGCGCT3') derived from the conserved sequences of Groundnut bud necrosis virus (GBNV) and WSMoV, part of the nucleocapsid (N) protein gene and the complete noncoding region upstream of the N gene's coding sequence were cloned and sequenced. Comparative sequence analysis of 291-bp region of the N gene revealed that the genus Tospovirus infecting ridge gourd shared maximum identity both at nucleotide (94%) and amino acid (97%) levels with the corresponding region of Watermelon bud necrosis virus (WBNV), which is a distinct species of WSMoV serogroup infecting watermelon in India (1). In contrast, only 76 to 81% and 82% identity at nucleotide and amino acid levels, respectively, was observed with the corresponding region of the N genes of GBNV and WSMoV. Natural infection of WBNV in cucurbits except watermelon in India is not known. To our knowledge, this is the first report of natural infection of ridge gourd by WBNV. References: (1) R. K. Jain et al. Arch. Virol. 143:1637, 1998. (2) J. W. Moyer. Tospoviruses (Bunyaviridae). Pages 1803-1807 in: Encyclopedia of Virology. A. Granoff and R. G. Webster, eds. Academic Press, New York, 1999.
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Affiliation(s)
- B Mandal
- Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi-110012, India
| | - R K Jain
- Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi-110012, India
| | - V Chaudhary
- Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi-110012, India
| | - A Varma
- Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi-110012, India
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Fata JE, Chaudhary V, Khokha R. Cellular turnover in the mammary gland is correlated with systemic levels of progesterone and not 17beta-estradiol during the estrous cycle. Biol Reprod 2001; 65:680-8. [PMID: 11514328 DOI: 10.1095/biolreprod65.3.680] [Citation(s) in RCA: 141] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Adult mammary tissue has been considered "resting" with minimal morphological change. Here, we reveal the dynamic nature of the nulliparous murine mammary gland. We demonstrate specific changes at the morphological and cellular levels, and uncover their relationship with the murine estrous cycle and physiological levels of steroid hormones. Differences in the numbers of higher-order epithelial branches and alveolar development led to extensive mouse-to-mouse mammary variations. Morphology (assigned grades 0-3) ranged from a complete lack of alveoli to the presence of numerous alveoli emanating from branches. Morphological changes were driven by epithelial proliferation and apoptosis, which differed between ductal versus alveolar structures. Proliferation within alveolar epithelium increased as morphological grade increased. Extensive alveolar apoptosis was restricted to tissue exhibiting grade 3 morphology, and was approximately 14-fold higher than at all other grades. Epithelial proliferation and apoptosis exhibited a positive relationship with serum levels of progesterone, but not with 17beta-estradiol. Compared with other estrous stages, diestrus was unique in that the morphological grade, epithelial proliferation, apoptosis, and progesterone levels all peaked at this stage. The regulated tissue remodeling of the mammary gland was orchestrated with mRNA changes in specific matrix metalloproteinases (MMP-9 and MMP-13) and specific tissue inhibitors of metalloproteinases (TIMP-3 and TIMP-4). We propose that the cyclical turnover of epithelial cells within the adult mammary tissue is a sum of spatial and functional coordination of hormonal and matrix regulatory factors.
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Affiliation(s)
- J E Fata
- Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, 610 University Avenue, Toronto, Ontario, Canada M5G 2M9
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Brinkmann U, Webber K, Di Carlo A, Beers R, Chowdhury P, Chang K, Chaudhary V, Gallo M, Pastan I. Cloning and expression of the recombinant FAb fragment of monoclonal antibody K1 that reacts with mesothelin present on mesotheliomas and ovarian cancers. Int J Cancer 1997; 71:638-44. [PMID: 9178820 DOI: 10.1002/(sici)1097-0215(19970516)71:4<638::aid-ijc21>3.0.co;2-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The monoclonal antibody (MAb) K1 recognizes an approximate 40 kDa glycoprotein, mesothelin, that is present on the surface of human mesothelial cells, mesotheliomas and ovarian cancers. We have cloned the cDNAs encoding the variable regions of MAb K1 and constructed plasmids for expression of recombinant K1(FAb). Recombinant FAb was produced in Escherichia coli in inclusion bodies that were solubilized and refolded to active protein. Binding of K1 MAb and FAb was compared by radioactive binding and competition assays and by surface plasmon resonance (BIAcore). Recombinant K1(FAb) binds to cells expressing K1-antigen with a similar affinity as papain derived FAb from K1(IgG) and with a 4- to 10-fold reduced affinity compared with bivalent IgG. The cloned FAb can be used to make higher affinity antibodies and immunoconjugates that could be useful for various types of immunotherapies.
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Affiliation(s)
- U Brinkmann
- Laboratory of Molecular Biology, NCI, NIH, Bethesda, MD 20892-4255, USA
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Kumar P, Nayak KC, Garhwal S, Chaudhary V. Alcohol consumption and hypertension. J Assoc Physicians India 1993; 41:81-3. [PMID: 8335613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The effect of acute alcohol consumption was studied in healthy subjects (Group-I) and in nondrinking hypertensive (Group-II) and in regularly drinking hypertensive patients (Group-III). All subjects consumed alcohol (1gm/kg body weight daily) for 5 days, then abstained for 5 days. Blood pressure was recorded in standing and supine position every morning. Group-I showed no significant difference in blood pressures during and after alcohol consumption. Group-II showed a statistically significant increase in the supine and standing systolic/diastolic and mean blood pressure when consuming alcohol (P < 0.01) as compared to the period of abstinence. In Group-III, hypertensive patients who drank regularly showed significant decrease in systolic blood pressure in the period of abstinence during standing (p < 0.02) as well as in supine position (p < 0.001) and diastolic and mean blood pressure reduction in standing and supine position (p < 0.01) as compared to the period of drinking.
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Affiliation(s)
- P Kumar
- Dept. of Medicine, SP Medical College, Bikaner
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Kumar P, Garhwal S, Chaudhary V. Rheumatic heart disease: a school survey in a rural area of Rajasthan. Indian Heart J 1992; 44:245-6. [PMID: 1289223] [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: 12/26/2022] Open
Abstract
Thirty four of 10168 school going children were found to have rheumatic heart disease (RHD) in a school survey conducted in the rural areas of Churu district in Rajasthan. The prevalence rate was 3.34/1000. A high prevalence of RHD was found in 11 to 15 year age group. Maximum prevalence of RHD was in low socioeconomic group. Out of these thirty four cases of RHD, isolated mitral stenosis was present in sixteen, isolated mitral regurgitation in four, combined mitral stenosis and mitral regurgitation in ten patients.
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Affiliation(s)
- P Kumar
- Medical and Health Department, Rajasthan
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Affiliation(s)
- I Pastan
- Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20829
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Qureshi AA, Qureshi N, Hasler-Rapacz JO, Weber FE, Chaudhary V, Crenshaw TD, Gapor A, Ong AS, Chong YH, Peterson D. Dietary tocotrienols reduce concentrations of plasma cholesterol, apolipoprotein B, thromboxane B2, and platelet factor 4 in pigs with inherited hyperlipidemias. Am J Clin Nutr 1991; 53:1042S-1046S. [PMID: 2012015 DOI: 10.1093/ajcn/53.4.1042s] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Normolipemic and genetically hypercholesterolemic pigs of defined lipoprotein genotype were fed a standard diet supplemented with 50 micrograms/g tocotrienol-rich fraction (TRF) isolated from palm oil. Hypercholesterolemic pigs fed the TRF supplement showed a 44% decrease in total serum cholesterol, a 60% decrease in low-density-lipoprotein (LDL)-cholesterol, and significant decreases in levels of apolipoprotein B (26%), thromboxane-B2 (41%), and platelet factor 4 (PF4; 29%). The declines in thromboxane B2 and PF4 suggest that TRF has a marked protective effect on the endothelium and platelet aggregation. The effect of the lipid-lowering diet persisted only in the hypercholesterolemic swine after 8 wk feeding of the control diet. These results support observations from previous studies on lowering plasma cholesterol in animals by tocotrienols, which are naturally occurring compounds in grain and palm oils and may have some effect on lowering plasma cholesterol in humans.
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Affiliation(s)
- A A Qureshi
- Advanced Medical Research, Madison, WI 53719
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Bruggemann EP, Chaudhary V, Gottesman MM, Pastan I. Pseudomonas exotoxin fusion proteins are potent immunogens for raising antibodies against P-glycoprotein. Biotechniques 1991; 10:202-4, 206, 208-9. [PMID: 1676289] [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: 12/28/2022] Open
Abstract
Antibodies to specific regions of human P-glycoprotein have been difficult to obtain. We developed a method to express in E. coli fusions between Pseudomonas exotoxin and specific regions of human P-glycoprotein. We used the polymerase chain reaction to amplify the desired regions of MDR1 cDNA and to introduce appropriate restriction sites. These fragments were cloned into the 3' end of the Pseudomonas exotoxin gene. With this system we produced large amounts of fusion proteins for immunizations, and we obtained positive rabbit antiserum against P-glycoprotein with most of these antigens. We now have a comprehensive panel of polyclonal antibodies against P-glycoprotein. This system should be generally useful to raise antibodies against other eukaryotic proteins that are difficult to prepare in large quantities.
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Affiliation(s)
- E P Bruggemann
- National Cancer Institute, National Institutes of Health
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Kumar P, Chaudhary V. Epidemiological study of hypertension in a rural community of western Rajasthan. Indian Heart J 1991; 43:43-5. [PMID: 1894301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The prevalence of hypertension was studied in a rural community of western Rajasthan comprising of 6840 subjects in the age range of 21-70 years. The overall prevalence of hypertension was 3.8 percent. It was 4.0 percent in males and 3.6 percent in females. The prevalence of hypertension increased with age in a linear fashion.
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Lorberboum-Galski H, FitzGerald D, Chaudhary V, Adhya S, Pastan I. Cytotoxic activity of an interleukin 2-Pseudomonas exotoxin chimeric protein produced in Escherichia coli. Proc Natl Acad Sci U S A 1988; 85:1922-6. [PMID: 3126499 PMCID: PMC279893 DOI: 10.1073/pnas.85.6.1922] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
A cDNA clone for human interleukin 2 (IL-2) has been fused to the 5' end of a modified Pseudomonas exotoxin (PE) gene that lacks the sequences encoding the cell recognition domain. The chimeric protein IL-2-PE40 was produced in Escherichia coli. It was extremely toxic to IL-2 receptor-positive cells but had no measurable effect on cells lacking the IL-2 receptor. IL-2-PE40 might be a useful cytotoxic agent in the treatment of diseases involving IL-2 receptor-positive cells and in the treatment of allograft rejection.
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Affiliation(s)
- H Lorberboum-Galski
- Laboratory of Molecular Biology, National Cancer Institute, Bethesda, MD 20892
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