1
|
Chopra K, Tyagi VV, Pathak SK, Khajuria A, Pandey AK, Rahman NA, Mansor M, Sari A. Impact of Stearic Acid as Heat Storage Material on Energy Efficiency and Economic Feasibility of a Vacuum Tube Solar Water Heater. Energies 2023; 16:4291. [DOI: 10.3390/en16114291] [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] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The overheating of heat pipes, poor transfer of heat across the absorber and finned heat pipes, and inability to provide hot water in the late evening hours are major problems associated with conventional heat pipe vacuum collector systems. The amalgamation of highly conductive storage material between the absorber tube (heat collecting surface) and the heat pipe is an effective way to overcome these problems. In this study, a stearic acid amalgamated vacuum tube solar collector system was designed and fabricated and its thermal output compared with a conventional vacuum tube system without storage material under the same environmental conditions. The experimental results showed that the amalgamation of stearic acid as storage material enhanced the thermal output of the solar system compared to the conventional one. The desired heat gain of the solar system with storage material increased by 31.30, 23.34, and 18.78% for Test 1_40 °C, Test 2_45 °C, and Test 3_50 °C, respectively. The technoeconomic analysis showed that almost 118.80 USD in revenue could be earned by the proposed solar system at the end of 15 years. The total running cost of ELG and the developed solar system was observed to be 202.62 and 86.70 USD, respectively. On average, the cost of hot water production using the solar system and ELG was found to be 0.0016 and 0.004 USD/L, respectively. The value of LEC was found to be 0.062 USD/electricity unit, which was much lower than the LEC value of ELG (0.116 USD/electricity unit). The value of NPW (73.73 USD) indicated high acceptability of the proposed system. The payback time is lower than the life of the system, indicating its suitability for use in the commercial sector. Therefore, the proposed solar system is highly recommended over conventional water heating systems in urban and rural areas.
Collapse
Affiliation(s)
- K. Chopra
- School of Mechanical Engineering, Shri Mata Vaishno Devi University, Katra 182320, India
- Institute of Power Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia
| | - V. V. Tyagi
- School of Energy Management, Shri Mata Vaishno Devi University, Katra 182320, India
| | - Sudhir Kumar Pathak
- School of Energy Management, Shri Mata Vaishno Devi University, Katra 182320, India
| | - Apaar Khajuria
- School of Mechanical Engineering, Shri Mata Vaishno Devi University, Katra 182320, India
| | - A. K. Pandey
- Research Centre for Nano-Materials and Energy Technology (RCNMET), School of Engineering and Technology, Sunway University, Kuala Lumpur 46150, Malaysia
- Center for Transdisciplinary Research (CFTR), Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India
| | - Nazaruddin Abd Rahman
- Institute of Power Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia
- Department of Electrical and Electronics Engineering, College of Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia
| | - Muhamad Mansor
- Institute of Power Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia
- Department of Electrical and Electronics Engineering, College of Engineering, Universiti Tenaga Nasional, Kajang 43000, Malaysia
| | - Ahmet Sari
- Department of Metallurgical and Material Engineering, Karadeniz Technical University, Trabzon 61080, Turkey
- Interdisciplinary Research Center of Renewable Energy and Power Systems (IRC-REPS), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| |
Collapse
|
2
|
Langan SM, Mulick AR, Rutter CE, Silverwood R, Asher I, García‐Marcos L, Ellwood E, Bissell K, Chiang C, Sony AE, Ellwood P, Marks G, Mortimer K, Martínez‐Torres AE, Morales E, Perez‐Fernandez V, Robertson S, Williams H, Strachan DP, Pearce N, Bissell K, Chiang CY, Marks , Mortimer K, Masekela R, Perez‐Fernández V, Martinez‐Torres AE, Robertson S, Rutter CE, Silverwood RJ, Mallol J, Soto‐Martinez ME, Cabrera Aguilar A, Douros K, Mohammed S, Singh M, Singh V, Sukumaran TU, Awasthi S, Kabra SK, Salvi S, Mérida‐Palacio JV, González‐Díaz SN, Navarrete‐Rodriguez EM, Sánchez JF, Falade AG, Zar HJ, López‐Silvarrey Varela A, González Díaz C, Nour M, Dib G, Mohammad Y, Huang J, Chinratanapisit S, Soto‐Quirós ME, El‐Sony A, Vichyanond P, Aguilar P, Barba S, Kumar L, Sharma SK, Hanumante NM, García‐Almaráz R, Merida‐Palacio JV, Del‐Río‐Navarro BE, Linares‐Zapién FJ, Onadeko BO, Musa OAA, Aguirre V, Baeza‐Bacab M, Mohammad S, Cortéz E, Gratziou CH, Chopra K, Nelson H, Rubio AD, Hsieh K, Shah J. Trends in eczema prevalence in children and adolescents: A Global Asthma Network Phase I Study. Clin Exp Allergy 2023. [DOI: 10.1111/cea.14276] [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: 02/10/2023]
Affiliation(s)
| | - Amy R. Mulick
- London School of Hygiene & Tropical Medicine London UK
| | | | - Richard J. Silverwood
- London School of Hygiene & Tropical Medicine London UK
- Centre for Longitudinal Studies, UCL Social Research Institute University College London London UK
| | - Innes Asher
- Department of Paediatrics: Child and Youth Health, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand
| | - Luis García‐Marcos
- Paediatric Allergy and Pulmonology Units, Virgen de la Arrixaca University Children's Hospital University of Murcia Murcia Spain
- IMIB Bio‐health Research Institute Murcia Spain
- ARADyAL Allergy Network Murcia Spain
| | - Eamon Ellwood
- Department of Paediatrics: Child and Youth Health, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand
| | - Karen Bissell
- School of Population Health, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand
| | - Chen‐Yuan Chiang
- International Union Against Tuberculosis and Lung Disease Paris France
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital Taipei Medical University Taipei Taiwan
- Division of Pulmonary Medicine, Department of Internal Medicine, School of Medicine, College of Medicine Taipei Medical University Taipei Taiwan
| | - Asma El Sony
- Epidemiological Laboratory (Epi‐Lab) for Public Health, Research and Development Khartoum Sudan
| | - Philippa Ellwood
- Department of Paediatrics: Child and Youth Health, Faculty of Medical and Health Sciences University of Auckland Auckland New Zealand
| | - Guy B. Marks
- Respiratory & Environmental Epidemiology University of New South Wales Sydney New South Wales Australia
| | - Kevin Mortimer
- Department of Medicine University of Cambridge Cambridge UK
- Department of Respiratory Medicine Liverpool University Hospitals NHS Foundation Trust Liverpool UK
- Department of Paediatrics and Child Health, College of Health Sciences, School of Clinical Medicine University of KwaZulu‐Natal Durban South Africa
| | - A. Elena Martínez‐Torres
- Paediatric Allergy and Pulmonology Units and Nurse Research Group Virgen de la Arrixaca University Children's Hospital Murcia Spain
- IMIB Bio‐health Research Institute, Edificio Departamental‐Laib Murcia Spain
| | - Eva Morales
- IMIB Bio‐health Research Institute, Edificio Departamental‐Laib Murcia Spain
- Department of Public Health Sciences University of Murcia Murcia Spain
| | - Virginia Perez‐Fernandez
- IMIB Bio‐health Research Institute, Edificio Departamental‐Laib Murcia Spain
- Department of Biostatistics University of Murcia Murcia Spain
| | - Steven Robertson
- Centre for Longitudinal Studies, UCL Social Research Institute University College London London UK
| | - Hywel C. Williams
- Centre for Evidence‐Based Dermatology University of Nottingham Nottingam UK
| | - David P. Strachan
- Population Health Research Institute St George's, University of London London UK
| | - Neil Pearce
- London School of Hygiene & Tropical Medicine London UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Gupta A, Chopra K. Online Classrooms: A Research Study to understand factors affecting Students’ motivation towards E-Learning. CM 2022. [DOI: 10.18137/cardiometry.2022.23.686698] [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: 11/08/2022] Open
Abstract
With advent of technology, disruptive ideas are witnessed blowing minds daily. Who could have thought students learning on internet will be witnessed? Distance Learning in India for education in India initiated within Correspondence Courses in 1962, responding to an ever-increasing demand for education could not be met by traditional system (Suresh, n.d.). Since then, online learning has seen a revolution, and now there is Khan Academy, Coursera, LinkedIn Learning, Udemy, Udacity, Codec demy, eDX, etc., among various online learning platforms available at one’s perusal. (MOOCs) are also examples of online learning options organizations are using to up skill their employees. In recent times, because of current COVID-19 situation, schools and colleges are facing a challenging time to provide quality education as they are unable to open their gates for students due to Government restrictions to contain spread of virus. This paper will discover influence of online education on students and what motivates them to pursue E-Learning.
Collapse
|
4
|
Seharawat A, Chopra K, Singh J. Study of factors influencing online purchase intention of electronic household products. CM 2022. [DOI: 10.18137/cardiometry.2022.23.641648] [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: 11/08/2022] Open
Abstract
The paper aims to study the impact of various factors influencing consumer household electronic product purchase intention on online platforms. Hundred and eighty-six filled responses were considered for the study with the help of a structured questionnaire. Much information was studied employing various regression techniques. The multiple regression analysis revealed that eWOM and Perceived Benefits positively and significantly impact consumer household electronic products purchase intention on online platforms. Among the predictors, eWOM had the strongest effect on the purchase intention towards consumer household electronic products on online platforms. The study outcomes give vital insights regarding the impact of various factors influencing consumer household electronic product purchase intention on online platforms. Google forms were used and distributed to the invitees asking them to fill data voluntarily. All respondents were promised confidentiality for their personal information. Perceived Risks were adapted from 19, and three items of Perceived eWOM were modified and taken to suit the current. Three items of Perceived price were adapted from.
Collapse
|
5
|
Chopra K, Gupta A, Meena J, Sagar R, Pandey R, Seth R. Psychiatric outcome in acute lymphoblastic leukemia survivors- The experience of a tertiary care center. Pediatric Hematology Oncology Journal 2021. [DOI: 10.1016/j.phoj.2022.03.024] [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] Open
|
6
|
Chopra K, Gupta A, Meena J, Chakrabarty B, Sagar R, Pandey R, Seth R. Behaviour disorders in acute lymphoblastic leukemia survivors; how are our survivors behaving? Pediatric Hematology Oncology Journal 2021. [DOI: 10.1016/j.phoj.2022.03.048] [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: 11/15/2022] Open
|
7
|
Bansal S, Chopra K. Selective ER-β agonists alleviate neuronal deficits in insulin-resistant estrogen-deficient rats. Climacteric 2021; 24:415-420. [PMID: 33719783 DOI: 10.1080/13697137.2020.1857353] [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] [Indexed: 10/21/2022]
Abstract
OBJECTIVE The present study aimed to determine the effect of estrogen receptor (ER) agonists on depression and memory impairment in insulin-resistant ovariectomized (OVX) rats. METHODS Rats underwent bilateral ovariectomy, and low-dose streptozotocin (STZ) and a high-fat diet (58% fat, 25% protein, and 17% carbohydrates as a percentage of kilocalories) were administered to induce an estrogen-deficient insulin-resistant state. After 1 week of STZ administration, rats were treated with 17β-estradiol (17βE2) and selective ER-α (propylpyrazoletriol) and ER-β (diarylpropionitrile) agonists (10 μg/kg subcutaneously). Memory was evaluated using the Morris water maze and depression using the forced swim test. RESULTS Treatment with selective ER-β agonist and 17βE2 but not with selective ER-α agonist significantly modulated the neurobehavioral deficits in insulin-resistant OVX rats. These neurobehavioral parameters were further correlated with brain-derived neurotrophic factor (BDNF) levels and acetylcholinesterase (AChE) activity. Selective ER-β agonist and 17βE2 significantly modulated BDNF levels and AChE activity in insulin-resistant OVX rats. Significant increases in estradiol and uterine weight were observed in 17βE2-treated rats, but selective ER agonists did not show any effect. CONCLUSION ER-β agonist can be an effective strategy for the mitigation of memory loss and depression in an estrogen-deficient insulin-resistant state without all of the deleterious feminizing effects that occur with the use of 17βE2.
Collapse
Affiliation(s)
- S Bansal
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - K Chopra
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| |
Collapse
|
8
|
Sharma N, Khanna A, Chandra S, Basu S, Chopra K, Singla N. Epidemiological correlates and treatment outcomes of MULTIDRUG-RESISTANT Tuberculosis in Delhi, India: A record-based operational research study. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.1202] [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] Open
|
9
|
Samra T, Bala I, Chopra K, Podder S. Effect of Intravenous Ondansetron on Sensory and Motor Block after Spinal Anaesthesia with Hyperbaric Bupivacaine. Anaesth Intensive Care 2019; 39:65-8. [DOI: 10.1177/0310057x1103900110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- T. Samra
- Department of Anaesthesia and Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - I. Bala
- Department of Anaesthesia and Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - K. Chopra
- Department of Anaesthesia and Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - S. Podder
- Department of Anaesthesia and Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| |
Collapse
|
10
|
Dhaliwal J, Singh D, Singh S, Pinnaka A, Boparai R, Bishnoi M, Kondepudi K, Chopra K. Lactobacillus plantarumMTCC 9510 supplementation protects from chronic unpredictable and sleep deprivation-induced behaviour, biochemical and selected gut microbial aberrations in mice. J Appl Microbiol 2018; 125:257-269. [DOI: 10.1111/jam.13765] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 03/13/2018] [Accepted: 03/14/2018] [Indexed: 12/22/2022]
Affiliation(s)
- J. Dhaliwal
- Pharmacology Division; University Institute of Pharmaceutical Sciences (UIPS); Panjab University; Chandigarh Punjab India
| | - D.P. Singh
- Pharmacology Division; University Institute of Pharmaceutical Sciences (UIPS); Panjab University; Chandigarh Punjab India
- National Agri-food Biotechnology Institute (NABI); SAS Nagar; Mohali Punjab India
- Toxicology Division; National Institute of Occupational Health; Meghani Nagar Ahmedabad Gujarat India
| | - S. Singh
- National Agri-food Biotechnology Institute (NABI); SAS Nagar; Mohali Punjab India
| | - A.K. Pinnaka
- Microbial Type Culture Collection and Gene Bank; CSIR - Institute of Microbial Technology; Chandigarh Punjab India
| | - R.K. Boparai
- Department of Biotechnology; Government College for Girls; Chandigarh Punjab India
| | - M. Bishnoi
- National Agri-food Biotechnology Institute (NABI); SAS Nagar; Mohali Punjab India
- Functional Foods Research Laboratory; University of Southern Queensland; Toowoomba-4350 Queensland Australia
| | - K.K. Kondepudi
- National Agri-food Biotechnology Institute (NABI); SAS Nagar; Mohali Punjab India
| | - K. Chopra
- Pharmacology Division; University Institute of Pharmaceutical Sciences (UIPS); Panjab University; Chandigarh Punjab India
| |
Collapse
|
11
|
Chopra K, Tyagi V, Gupta P, Selvaraj J, Abd Rahim N. Recent advancement in heat pipe for stationary solar collectors. 5th IET International Conference on Clean Energy and Technology (CEAT2018) 2018. [DOI: 10.1049/cp.2018.1344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
12
|
Arora R, Kuhad A, Kaur IP, Chopra K. Curcumin loaded solid lipid nanoparticles ameliorate adjuvant-induced arthritis in rats. Eur J Pain 2014; 19:940-52. [PMID: 25400173 DOI: 10.1002/ejp.620] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2014] [Indexed: 01/08/2023]
Abstract
BACKGROUND Rheumatoid arthritis (RA), a chronic and systemic inflammation, results in destruction of joints and cartilages. Effectiveness of curcumin has been established in a wide variety of inflammatory disorders, but its utility as a therapeutic agent is limited by its poor absorption, rapid metabolism and fast systemic elimination. To apprehend these limitations, we propose to use highly bioavailable curcumin loaded solid lipid nanoparticles (C-SLNs) for the treatment of RA. METHODS In the present study, the protective effect of curcumin and its SLNs was evaluated in complete Freund's adjuvant (CFA)-induced arthritis in rats. RESULTS Arthritic rats exhibited marked decrease in paw withdrawal threshold in Randall-Selitto and von Frey hair test along with decreased reaction time in hot plate. Arthritic rats also showed significant joint hyperalgesia, joint stiffness and increased paw volume along with marked decrease in mobility score. Arthritic rats showed a significant increase in blood leukocyte count, oxidative-nitrosative stress, tumour necrosis factor-α, C-reactive protein, cyclic citrullinated peptide antibody levels and radiological alterations in tibiotarsal joint. C-SLN administration (10 and 30 mg/kg), when compared with free curcumin (10 and 30 mg/kg), significantly and dose dependently ameliorated various symptoms of arthritis in rats, improved biochemical markers and preserved radiological alterations in joints of arthritic rats. CONCLUSIONS The current findings suggest the protective potential of curcumin-SLNs in ameliorating CFA-induced arthritis in rats through attenuation of oxido-inflammatory and immunomodulatory cascade. Further, the results emphasize that SLNs are a novel approach to deliver curcumin into the inflamed joints and improve its biopharmaceutical performance.
Collapse
Affiliation(s)
- R Arora
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Center of Advanced Study, Panjab University, Chandigarh, India
| | - A Kuhad
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Center of Advanced Study, Panjab University, Chandigarh, India
| | - I P Kaur
- Pharmaceutics Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Center of Advanced Study, Panjab University, Chandigarh, India
| | - K Chopra
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Center of Advanced Study, Panjab University, Chandigarh, India
| |
Collapse
|
13
|
Chopra K, Sabino J, Holton L, Bluebond-Langner R, Tadisina K, Singh D. Intraoperative Indocyanine Green Angiography to Evaluate Nipple-Areola Complex Perfusion in Patients with Macro or Gigantomastia. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.760] [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]
|
14
|
Arora V, Chopra K. Modulation of oxido-nitrosative stress induced neuro-inflammatory cascade & monoaminergic pathway by resveratrol in reserpine induced pain depression dyad in rats. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.1876] [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: 11/27/2022]
|
15
|
Tiwari V, Chopra K. Protective effect of curcumin against chronic alcohol-induced cognitive deficits and neuroinflammation in the adult rat brain. Neuroscience 2013; 244:147-58. [DOI: 10.1016/j.neuroscience.2013.03.042] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 03/08/2013] [Accepted: 03/25/2013] [Indexed: 10/27/2022]
|
16
|
Abstract
OBJECTIVE Estrogen deprivation after menopause is associated with increased oxidative stress. The present study was designed to study the role of sesamol (3,4-methylenedioxyphenol), a phenolic antioxidant and anti-inflammatory molecule, in oxidative stress-induced changes in three major affected organ systems, the central nervous system, the cardiovascular system and the skeletal system in ovariectomized rats, a widely used animal model of menopause. DESIGN Animals were divided into eight different groups (n = 6-8). Five groups underwent ovariectomy; starting from the 2nd day of ovariectomy, three of these groups received sesamol (2, 4, 8 mg/kg) and the fourth group was administered α-tocopherol (100 mg/kg) orally for 7 weeks. The fifth ovariectomized group did not receive any drug treatment. Rats in the naïve (non-operated) and sham-operated groups did not receive any drug treatment, while the eighth group consisted of naïve animals which were treated for 7 weeks with only sesamol 8 mg/kg orally daily. After 7 weeks, animals were subjected to testing of behavioral paradigms (elevated plus maze and Morris water maze for assessment of anxiety and memory, respectively) 24 h after the last dose. After behavioral studies, animals were sacrificed for various biochemical estimations. RESULT Administration of sesamol (2, 4, 8 mg/kg orally) to ovariectomized rats for 7 weeks significantly and dose-dependently improved memory, attenuated anxiety, decreased oxidative stress in brain, improved the serum lipid profile and reduced serum tumor necrosis factor-α levels when compared with ovariectomized control rats. Similar protective effects were observed in the case of the skeletal system studies. Sesamol increased the bone ash content and the mechanical stress parameters in treated groups. CONCLUSION The results emphasize the involvement of oxidative stress and inflammation in the development of ovariectomy-induced pathophysiological changes and point towards the therapeutic potential of sesamol in menopausal pathologies.
Collapse
Affiliation(s)
- A Kaur
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study, Panjab University, Chandigarh, India
| | | | | | | |
Collapse
|
17
|
Chopra K, Mummery PM, Derby B, Gough JE. Gel-cast glass-ceramic tissue scaffolds of controlled architecture produced via stereolithography of moulds. Biofabrication 2012; 4:045002. [DOI: 10.1088/1758-5082/4/4/045002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
18
|
Sah S, Mathela C, Chopra K. Valeriana wallichii DC (Maaliol Chemotype): Antinociceptive Studies on Experimental Animal Models and Possible Mechanism of Action. ACTA ACUST UNITED AC 2012. [DOI: 10.5567/pharmacologia.2012.432.437] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
19
|
Singh PK, Chopra K, Kuhad A, Kaur IP. Role of Lactobacillus acidophilus loaded floating beads in chronic fatigue syndrome: behavioral and biochemical evidences. Neurogastroenterol Motil 2012; 24:366-e170. [PMID: 22296294 DOI: 10.1111/j.1365-2982.2011.01861.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND In recent years the interface between neuropsychiatry and gastroenterology has converged in to a new discipline referred to as enteric neuroscience. Implications of brain-gut communication in the pathogenesis of psychiatric disorders indicate a possible role of suitably packaged/delivered probiotics as newer therapeutic options. In the present study probable role of per-oral administration of free Lactobacillus acidophilus (LAB) and LAB loaded alginate beads in attenuation of the symptoms associated with chronic fatigue syndrome (CFS) were evaluated. METHODS Chronic fatigue syndrome following physical fatigue was induced in rats by forcing them to swim (forced swim test; FST) in water till exhaustion, after weighing them down with 10% their body weight, daily for 28 days. Immobility (I) and postswim fatigue time (PSF) were taken as suitable markers. Free LAB and LAB loaded floating beads (FBs) were administered, from 21 to 28 days. KEY RESULTS Immobility and PSF were found to increase considerably in FST rats (665 ± 22 s and 196 ± 6 s) as compared with the naïve (32 ± 7 s and 22 ± 2 s) at 20 days, establishing severe fatigue like behavior. FST control group exhibited significant (P < 0.05) hypertrophy of spleen, hypotrophy of thymus, and increased oxido-nitrosative stress in brain and tumor necrosis factor-α (TNF-α) levels in serum. Treatment with LAB and LAB FBs significantly decreased I and PSF and attenuated (P < 0.05) oxido-nitrosative stress and TNF-α levels. Spleen and thymus were also restored to their original size in this group. CONCLUSIONS & INFERENCES The findings suggest a valuable therapeutic role of LAB especially when incorporated into alginate beads for the treatment of CFS.
Collapse
Affiliation(s)
- P K Singh
- University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study, Panjab University, Chandigarh 160014, India
| | | | | | | |
Collapse
|
20
|
Kuhad A, Arora V, Takyar J, Kuhad A, Chopra K. Neotric advances in vascular dementia - Highlights from the 7th International Congress on Vascular Dementia, October 20-23, 2011, Riga, Latvia. DRUG FUTURE 2012. [DOI: 10.1358/dof.2012.037.03.1752357] [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: 10/25/2022]
|
21
|
Arora V, Kuhad A, Tiwari V, Chopra K. Curcumin ameliorates reserpine-induced pain-depression dyad: behavioural, biochemical, neurochemical and molecular evidences. Psychoneuroendocrinology 2011; 36:1570-81. [PMID: 21612876 DOI: 10.1016/j.psyneuen.2011.04.012] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 04/21/2011] [Accepted: 04/22/2011] [Indexed: 01/19/2023]
Abstract
An apparent clinical relationship between pain and depression has long been recognized. Depression and pain are often diagnosed in the same patients. The emerging concept for pain-depression pathogenesis is the dysfunction of biogenic amine-mediated pain-depression control and the possible involvement of nitrodative stress-induced neurogenic inflammation. The present study was designed to investigate the effect of curcumin on reserpine-induced pain-depression dyad in rats. Administration of reserpine (1mg/kg subcutaneous daily for three consecutive days) led to a significant decrease in nociceptive threshold as evident from reduced paw withdrawal threshold in Randall Sellitto and von-Frey hair test as well as significant increase in immobility time in forced swim test. This behavioural deficit was integrated with decrease in the biogenic amine (dopamine, norepinephrine and serotonin) levels along with increased substance P concentration, nitrodative stress, inflammatory cytokines, NF-κβ and caspase-3 levels in different brain regions (cortex and hippocampus) of the reserpinised rats. Curcumin (100, 200, 300mg/kg; ip) dose dependently ameliorated the behavioural deficits associated with pain and depression by restoring behavioural, biochemical, neurochemical and molecular alterations against reserpine-induced pain-depression dyad in rats.
Collapse
Affiliation(s)
- V Arora
- University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study, Panjab University, Chandigarh, India
| | | | | | | |
Collapse
|
22
|
Hashash J, Chopra K, Behari J. Hepatobiliary and pancreatic: bleeding duodenal varices. J Gastroenterol Hepatol 2011; 26:1341. [PMID: 21771063 DOI: 10.1111/j.1440-1746.2011.06810.x] [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: 12/09/2022]
Affiliation(s)
- Jg Hashash
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States of America
| | | | | |
Collapse
|
23
|
Kuhad A, Arora V, Takyar J, Kuhad A, Chopra K. Recent advances in neuroscience research: Highlights from the 8th International Brain Research Organisation Meeting, held July 14-18, 2011,Florence, Italy. DRUG FUTURE 2011. [DOI: 10.1358/dof.2011.036.12.1722070] [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: 10/24/2022]
|
24
|
Kuhad A, Arora V, Chopra K. Recent advances in polyphenol research: Highlights from the 4th International Conference on Polyphenols and Health. DRUG FUTURE 2010. [DOI: 10.1358/dof.2010.035.010.1513901] [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: 10/18/2022]
|
25
|
Kuhad A, Arora V, Chopra K. Recent advances in polyphenol research: Highlights from the 4th International Conference on Polyphenols and Health. DRUG FUTURE 2010. [DOI: 10.1358/dof.2010.35.10.1513901] [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: 04/08/2023]
|
26
|
Bishnoi M, Kulkarni S, Chopra K. P2.070 Activation of striatal inflammatory mediators and caspase-3 is central to haloperidol-induced orofacial dyskinesia. Parkinsonism Relat Disord 2009. [DOI: 10.1016/s1353-8020(09)70421-3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
27
|
Das I, Srivastava S, Cheng C, Chopra K, Jones A, Mihailidis D, Pai S, Sarkar A, Taylor M, Wuu C, Johnstone P. SU-FF-T-506: Patterns of Care in the Era of ICRU-50 for 3D Conformal Radiation Therapy: A Multi-Institutional Study. Med Phys 2009. [DOI: 10.1118/1.3182004] [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: 11/07/2022] Open
|
28
|
Kamboj SS, Chopra K, Sandhir R. Hyperglycemia-induced alterations in synaptosomal membrane fluidity and activity of membrane bound enzymes: beneficial effect of N-acetylcysteine supplementation. Neuroscience 2009; 162:349-58. [PMID: 19426784 DOI: 10.1016/j.neuroscience.2009.05.002] [Citation(s) in RCA: 35] [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] [Received: 03/04/2009] [Revised: 04/14/2009] [Accepted: 05/02/2009] [Indexed: 12/20/2022]
Abstract
Diabetic encephalopathy is characterized by impaired cognitive functions that appear to underlie neuronal damage triggered by glucose driven oxidative stress. Hyperglycemia-induced oxidative stress in diabetic brain may initiate structural and functional changes in synaptosomal membranes. The objective of the present study was to examine the neuroprotective role of N-acetylcysteine (NAC) in hyperglycemia-induced alterations in lipid composition and activity of membrane bound enzymes (Na(+),K(+)-ATPase and Ca(2+)-ATPase) in the rodent model of type 1 diabetes. Male Wistar rats weighing between 180 and 200 g were rendered diabetic by a single injection of streptozotocin (50 mg/kg body weight, i.p.). The diabetic animals were administered NAC (1.4-1.5 g/kg body weight) for eight weeks and lipid composition along with membrane fluidity were determined. A significant increase in lipid peroxidation was observed in cerebral cortex of diabetic rats. NAC administration on the other hand lowered the hyperglycemia-induced lipid peroxidation to near control levels. The increased lipid peroxidation following chronic hyperglycemia was accompanied by a significant increase in the total lipids which can be attributed to increase in the levels of cholesterol, triglycerides and glycolipids. On the contrary phospholipid and ganglioside levels were decreased. Hyperglycemia-induced increase in cholesterol to phospholipid ratio reflected decrease in membrane fluidity. Fluorescence polarization (p) with DPH also confirmed decrease in synaptosomal membrane fluidity that influenced the activity of membrane bound enzymes. An inverse correlation was found between fluorescence polarization with the activities of Na(+),K(+)-ATPase (r(2)=0.416, P<0.05) and Ca(2+) ATPase (r(2)=0.604, P<0.05). NAC was found to significantly improve lipid composition, restore membrane fluidity and activity of membrane bound enzymes. Our results clearly suggest perturbations in lipid composition and membrane fluidity as a major factor in the development of diabetic encephalopathy. Furthermore, NAC administration ameliorated the effect of hyperglycemia on oxidative stress and alterations in lipid composition thereby restoring membrane fluidity and activity of membrane bound enzymes.
Collapse
Affiliation(s)
- S Singh Kamboj
- Department of Biochemistry, Basic Medical Science Block, Panjab University, Sector-14, Chandigarh 160014, India
| | | | | |
Collapse
|
29
|
Rajamannan NM, Antonini-Canterin F, Moura L, Zamorano JL, Rosenhek RA, Best PJ, Lloyd MA, Rocha-Goncalves F, Chandra S, Alfieri O, Lancellotti P, Tornos P, Baliga RR, Wang A, Bashore T, Ramakrishnan S, Spargias K, Shuvy M, Beeri R, Lotan C, Suwaidi JA, Bahl V, Pierard LA, Maurer G, Nicolosi GL, Rahimtoola SH, Chopra K, Pandian NG. Medical therapy for rheumatic heart disease: is it time to be proactive rather than reactive? Indian Heart J 2009; 61:14-23. [PMID: 19729684 PMCID: PMC3951844] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
Rheumatic Heart Disease (RHD) is well known to be an active inflammatory process which develops progressive calcification and leaflet thickening over time. The potential for statin therapy in slowing the progression of valvular heart disease is still controversial. Retrospective studies have shown that medical therapy is beneficial for patients with calcific aortic stenosis and recently for rheumatic valve disease. However, the prospective randomized clinical trials have been negative to date. This article discusses the epidemiologic risk factors, basic science, retrospective and prospective studies in valvular heart disease and a future clinical trial to target RHD with statin therapy to slow the progression of this disease. Recent epidemiological studies have revealed the risk factors associated with valvular disease include male gender, smoking, hypertension and elevated serum cholesterol and are similar to the risk factors for vascular atherosclerosis. An increasing number of models of experimental hypercholesterolemia demonstrate features of atherosclerosis in the aortic valve (AV), which are similar to the early stages of vascular atherosclerotic lesions. Calcification, the end stage process of the disease, must be understood as a prognostic indicator in the modification of this cellular process before it is too late. This is important in calcific aortic stenosis as well as in rheumatic valve disease. There are a growing number of studies that describe similar pathophysiologic molecular markers in the development of rheumatic valve disease as in calcific aortic stenosis. In summary, these findings suggest that medical therapies may have a potential role in patients in the early stages of this disease process to slow the progression of RHD affecting the valves. This review will summarize the potential for statin therapy for this patient population.
Collapse
Affiliation(s)
- Nalini M Rajamannan
- Bluhm Cardiovascular Institute, Nortwestern University Feinberg School of Medicine, Tarry, Chicago IL, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Saxena P, Misro MM, Roy S, Chopra K, Sinha D, Nandan D, Trivedi SS. Possible role of male factors in recurrent pregnancy loss. Indian J Physiol Pharmacol 2008; 52:274-282. [PMID: 19552059] [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: 05/28/2023]
Abstract
To evaluate various causes possibly contributing towards recurrent pregnancy loss (RPL), particularly male factors. Prospective study of 75 couples with history of RPL who were investigated for genetic, anatomic, immunological, infective and systemic causes in both partners. Functional sperm capacity was assessed by the Hypo-osmotic swelling test (HOS), Acrosomal Reaction (AR), Nuclear condensation-decondensation test (NCD) and Seminal Total Leukocyte Count (TLC) along with semen analysis. Twenty male volunteers with recently proven fertility were also included for detailed sperm morphology and sperm functions test as controls. Amongst male partners 3 (4%) had varicocele, 23 (30.6%) had infection, 1 (1.3%) immunological and 1 (1.3%) had genetic abnormality. Sperm motility, viability and sperm function tests were significantly lower in the RPL group as compared to the control group (P = 0.000). Male factor might be a possible contributing factor towards RPL. Both the partners should be evaluated and treated simultaneously in order to achieve desirable outcome.
Collapse
Affiliation(s)
- Pikee Saxena
- Department of Obstetrics and Gynecology, Lady Hardinge Medical College and Shrimati Sucheta Kriplani Hospital, New Delhi 110 001.
| | | | | | | | | | | | | |
Collapse
|
31
|
|
32
|
Bishnoi M, Chopra K, Kulkarni SK. Neurochemical changes associated with chronic administration of typical antipsychotics and its relationship with tardive dyskinesia. ACTA ACUST UNITED AC 2007; 29:211-6. [PMID: 17520104 DOI: 10.1358/mf.2007.29.3.1075355] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [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: 10/23/2022]
Abstract
The therapeutic success of atypical antipsychotics has focused the attention on the role of receptor systems other than dopaminergic system in the pathophysiology of neuroleptic-associated extrapyramidal side effects such as tardive dyskinesia. In the present study we planned to study time-dependent changes in extracellular levels of norepinephrine, dopamine and serotonin in cortical and subcortical (including striatum) regions of brain and tried to correlate them with hyperkinetic motor activities (vacuous chewing movements [VCMs], tongue protrusions and facial jerking) in rats treated chronically with typical neuroleptics (haloperidol and chlorpromazine). Chronic administration of haloperidol (1 mg/kg) and chlorpromazine (5 mg/kg) resulted in a time-dependent increase in orofacial hyperkinetic movements. There were also significant changes in the extracellular levels of different neurotransmitters in different brain regions (cortical and subcortical regions) as measured by high-performance liquid chromatography/electrochemical detection (HPLC/ED). Both haloperidol and chlorpromazine produced time-dependent decreases in the levels of these neurotransmitters.
Collapse
Affiliation(s)
- M Bishnoi
- Centre with Potential for Excellence in Biomedical Sciences (CPEBS), Punjab University, Chandigarh, India
| | | | | |
Collapse
|
33
|
Kakkar V, Kaur D, Chopra K, Kaur A, Kaur IP. Assessment of the variation in menopausal symptoms with age, education and working/non-working status in north-Indian sub population using menopause rating scale (MRS). Maturitas 2007; 57:306-14. [PMID: 17408889 DOI: 10.1016/j.maturitas.2007.02.026] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Revised: 02/03/2007] [Accepted: 02/14/2007] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To study the variation of the menopause rating scale (MRS) scores with age, working/non-working and educated/uneducated status in a cohort of north-Indian subpopulation and to look for the possible reasons for the incurred variations. MRS is a well-known and validated instrument for assessing the frequency and intensity of menopausal symptoms. METHOD A menopause clinic was organized in collaboration with a primary care centre (under the guidance of a gynecologist). A random sample of 208 women aged 35-65 years participated in the study. The MRS scale, a self-administered standardized questionnaire was applied with additional patient related information (age at menopause, level of education, working/non-working and exercising or not). RESULTS The results were evaluated for psychological (P), somatic (S), and urogenital (U) symptoms. The average age at which menopause set in, in the cohort was found to be 48.7+/-2.3 years (46.4-51 years). Based on the average age at the menopause, the cohort was divided into peri (35-45), menopausal/early menopause (46-51) and the postmenopausal (52-65) groups. A significantly higher % of perimenopausal women (36%) showed a P score of > or =7; while a higher % of postmenopausal showed S score and U score > or =7 (>40%; p< or =0.001). Working women seem to suffer more from psychological symptoms whereas non-working women showed a greater incidence of somatic symptoms. Educated women showed a lower incidence of psychological and somatic symptoms. CONCLUSIONS Present study indicates that age, level of education and working/non-working status (in a group of women with same socio-cultural background) may also contribute to significant variations in menopausal symptoms.
Collapse
Affiliation(s)
- V Kakkar
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India
| | | | | | | | | |
Collapse
|
34
|
Das I, Chang S, Cheng C, Chopra K, Desrosiers C, Hasson B, Jiang Z, Mitra R, Murphy S. WE-C-M100F-06: Dosimetric Comparison of High-Z Inhomogeneity in IMRT: A Collaborative Study. Med Phys 2007. [DOI: 10.1118/1.2761525] [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: 11/07/2022] Open
|
35
|
Das I, Cheng C, Chopra K, Misic V, Schule E. SU-FF-J-17: Evaluation of Quality Assurance Phantom for Electronic Portal Imaging Device (EPID). Med Phys 2007. [DOI: 10.1118/1.2760522] [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: 11/07/2022] Open
|
36
|
Sharma S, Chopra K, Kulkarni SK, Agrewala JN. Resveratrol and curcumin suppress immune response through CD28/CTLA-4 and CD80 co-stimulatory pathway. Clin Exp Immunol 2007; 147:155-63. [PMID: 17177975 PMCID: PMC1810449 DOI: 10.1111/j.1365-2249.2006.03257.x] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [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: 12/20/2022] Open
Abstract
The role of resveratrol and curcumin is well documented in cancer, inflammation, diabetes and various other diseases. However, their immunosuppressive action on T cells, B cells and macrophages is not well documented. In the present study, we have ascertained the effect of resveratrol and curcumin on T and B cells and macrophages. The most striking findings were that both resveratrol and curcumin suppressed the activity of T and B cells and macrophages, as evidenced by significant inhibition in proliferation, antibody production and lymphokine secretion. Interestingly, curcumin imparted immunosuppression by mainly down-regulating the expression of CD28 and CD80 and up-regulating CTLA-4. Resveratrol also functioned by decreasing the expression of CD28 and CD80, as well as by augmenting the production of interleukin (IL)-10.
Collapse
Affiliation(s)
- S Sharma
- Immunology Laboratory, Institute of Microbial Technology, Chandigarh, India
| | | | | | | |
Collapse
|
37
|
Bishnoi M, Chopra K, Kulkarni S. U-74500A (Lazaroid), a 21-aminosteroid attenuates neuroleptic-induced orofacial dyskinesia. ACTA ACUST UNITED AC 2007; 29:601-5. [DOI: 10.1358/mf.2007.29.9.1161006] [Citation(s) in RCA: 2] [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: 10/20/2022]
|
38
|
Kaur G, Tirkey N, Bharrhan S, Chanana V, Rishi P, Chopra K. Inhibition of oxidative stress and cytokine activity by curcumin in amelioration of endotoxin-induced experimental hepatoxicity in rodents. Clin Exp Immunol 2006; 145:313-21. [PMID: 16879252 PMCID: PMC1809677 DOI: 10.1111/j.1365-2249.2006.03108.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [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
The present study is aimed at investigating the effect of curcumin (CMN) in salvaging endotoxin-induced hepatic dysfunction and oxidative stress in the liver of rodents. Hepatotoxicity was induced by administering lipopolysaccharide (LPS) in a single dose of 1 mg/kg intraperitoneally to the animals, which were being treated with CMN daily for 7 days. Liver enzymes serum alanine aminotransferase (ALT), serum aspartate aminotransferase (AST) and alkaline phosphatase (ALP), total bilirubin and total protein were estimated in serum. Oxidative stress in liver tissue homogenates was estimated by measuring thiobarbituric acid reactive substances (TBARS), glutathione (GSH) content and superoxide dismutase (SOD) activity. Serum and tissue nitrite was estimated using Greiss reagent and served as an indicator of NO production. A separate set of experiments was performed to estimate the effect of CMN on cytokine levels in mouse serum after LPS challenge. LPS induced a marked hepatic dysfunction evident by rise in serum levels of ALT, AST, ALP and total bilirubin (P < 0.05). TBARS levels were significantly increased, whereas GSH and SOD levels decreased in the liver homogenates of LPS-challenged rats. CMN administration attenuated these effects of LPS successfully. Further CMN treatment also regressed various structural changes induced by LPS in the livers of rats and decreased the levels of tumour necrosis factor-alpha and interleukin-6 in mouse plasma. In conclusion, these findings suggest that CMN attenuates LPS-induced hepatotoxicity possibly by preventing cytotoxic effects of NO, oxygen free radicals and cytokines.
Collapse
Affiliation(s)
- G Kaur
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh-160014, India
| | | | | | | | | | | |
Collapse
|
39
|
Cheng C, Chopra K, Das I. SU-FF-T-138: Dose Variation On the Simultaneous Irradiation of Head and Neck (H&N) Cancer and Supraclavicular Nodal Fields with Step-And-Shoot IMRT. Med Phys 2005. [DOI: 10.1118/1.1997809] [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: 11/07/2022] Open
|
40
|
Das I, Cashon K, Chopra K, Khadivi K, Malhotra H, Mayo C. WE-E-T-617-06: Intra- and Inter-Planner Dosimetric Variations in Inverse Planning of IMRT. Med Phys 2005. [DOI: 10.1118/1.1998607] [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: 11/07/2022] Open
|
41
|
Szeglin S, Das I, Chopra K, Schuele E, Barker R. SU-FF-T-258: Two-Dimensional (2D) Ion Chamber Array for Radiation Dose Verification Including IMRT. Med Phys 2005. [DOI: 10.1118/1.1997987] [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: 11/07/2022] Open
|
42
|
Olch A, Chopra K, Jiang Z, Mitra R, Hasson B, Chang S, Cheng C, Das I. SU-FF-T-136: Correlation Between IMRT Plan and Delivery Quality for 9 Treatment Planning Systems. Med Phys 2005. [DOI: 10.1118/1.1997807] [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: 11/07/2022] Open
|
43
|
Mitra R, Bagala T, Olch A, Das I, Cheng C, Chopra K, Hasson B, Jiang Z, Murphy S, Lian J, Ahnesjo A. SU-FF-T-70: Dosimetric Comparison of Inhomogeniety Corrections in IMRT Treatment Planning Systems: A Collaborative Study. Med Phys 2005. [DOI: 10.1118/1.1997741] [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: 11/07/2022] Open
|
44
|
Zaka-ur-Rab Z, Chopra K. Diabetes melliitus in neurofibromatosis I: an unusual presentation. Indian Pediatr 2005; 42:185-6. [PMID: 15767722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
|
45
|
Abstract
Rhabdomyolysis is a condition caused by skeletal muscle injury and release of muscle cell contents into the circulation. It may result in myoglobinuria, the filtration of myoglobin into the urine, and is often associated with acute renal failure (ARF). Rhabdomyolysis may complicate many disease states. In some, such as crush injury, muscle injury is obvious; in others, such as drug overdose, it may never be apparent. It may occur in the setting of an altered mental status, and even in the conscious patient, it may occur with minimal symptoms or physical findings. Therefore, diagnosis requires a high level of suspicion and appropriate sensitivity to abnormal laboratory values. Many insults can precipitate rhabdomyolysis and myoglobinuria. Disruption of the muscle cell membrane may result from a direct mechanical or toxic insult to the membrane or an inability to maintain ionic gradients across the membrane (as in ischemia or extreme exertion). This article reviews the etiology, pathogenesis, clinical features, complications, and management of rhabdomyolysis, particularly crush injuries in the setting of a major disaster.
Collapse
Affiliation(s)
- D Singh
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India.
| | | | | |
Collapse
|
46
|
Abstract
The underlying mechanisms of myocardial preconditioning after a brief period of renal ischemia-reperfusion are unknown. The phenomenon itself and the involvement of AT(1) angiotensin receptors was therefore investigated using an in vivo rat model of acute myocardial infarction. Anesthetized rats underwent a left thoracotomy and pericardiotomy. A laparotomy was performed to expose the left renal artery. Animals were then preconditioned with four episodes, each consisting of 5 min of renal artery occlusion followed by 10 min of reperfusion, or underwent a 60 min sham period of anesthesia. Subsequently, the left coronary artery was occluded for 30 min and reperfused for 2 h. Area at risk and infarct size was estimated along with hemodynamic and temperature data recording. The infarct-to-risk ratio was limited from 56.36 +/- 2.36 and 50.65 +/- 4.71 in control to 12.0 +/- 0.48 and 12.57 +/- 0.44 in preconditioned hearts, by volume and weight methods. The protective effect of renal preconditioning on the myocardium was not abolished by losartan 1 mg/kg (10.11 +/- 0.12 and 11.2 +/- 1.4) pretreatment whereas it was completely attenuated by losartan 5 mg/kg (46.5 +/- 1.0 and 47.8 +/- 1.4) administration. Thus we can infer that angiotensin AT(1) receptors participate in renal preconditioning of the myocardium in in vivo rat hearts.
Collapse
Affiliation(s)
- D Singh
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | |
Collapse
|
47
|
Vlavianos P, Chopra K, Mandalia S, Anderson M, Thompson J, Westaby D. Endoscopic balloon dilatation versus endoscopic sphincterotomy for the removal of bile duct stones: a prospective randomised trial. Gut 2003; 52:1165-9. [PMID: 12865276 PMCID: PMC1773772 DOI: 10.1136/gut.52.8.1165] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [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: 12/12/2022]
Abstract
BACKGROUND Endoscopic balloon dilatation (EBD) of the sphincter of Oddi has been proposed as an alternative therapy with possible advantages, as compared with endoscopic sphincterotomy (ES), for removal of bile duct stones. PATIENTS AND METHODS In a randomised study, we compared the efficacy and complication rate of the two techniques in 202 patients with common bile duct stones. Patients were followed up for 12 months. RESULTS A total of 103 patients were randomised to the EBD group and 99 to the ES group. Overall duct clearance was 87.1% and did not differ between the two groups (EBD 87.4%; ES 86.9%). The complication rate at 24 hours was 6.8% in the EBD group and 3.0% in the ES group (NS). Complications during follow up were 11.7% and 15.2% respectively (NS). A multivariate logistic regression analysis showed only the size of the largest stone to be predictive of success for either technique. CONCLUSION Endoscopic balloon dilatation offers no significant advantage over the well established technique of endoscopic sphincterotomy for the removal of bile duct stones.
Collapse
Affiliation(s)
- P Vlavianos
- Gastrointestinal Unit, Chelsea and Westminster Hospital, London, UK
| | | | | | | | | | | |
Collapse
|
48
|
Abstract
Renal ischemia-reperfusion injury constitutes the most common pathogenic factor for acute renal failure and is the main contributor to renal dysfunction in allograft recipients and revascularization surgeries. Many studies have demonstrated that reactive oxygen species play an important role in ischemic acute renal failure. The aim of the present study was to investigate the effects of the synthetic antiischemic agent trimetazidine in a rat model of renal ischemia-reperfusion injury. Renal ischemia-reperfusion was induced by clamping the unilateral renal artery for 45 min followed by 24 h of reperfusion. Trimetazidine (2.5 mg/kg i.p.) was administered 24 and 12 h prior to renal artery occlusion and the same dose was given intravenously 1 h before inducing ischemia. Tissue lipid peroxidation was measured as thiobarbituric acid reacting substances (TBARS) in kidney homogenates. Renal function was assessed by estimating serum creatinine, blood urea nitrogen (BUN), creatinine and urea clearance. Renal morphological alterations were assessed by histopathological examination of hematoxylin-eosin stained sections of the kidneys. Ischemia-reperfusion produced elevated levels of TBARS and deteriorated the renal function as assessed by increased serum creatinine, BUN and decreased creatinine and urea clearance compared with sham operated rats. The ischemic kidneys of rats showed severe hyaline casts, epithelial swelling, proteinaceous debris, tubular necrosis, medullary congestion and hemorrhage. Trimetazidine markedly reduced elevated levels of TBARS and significantly attenuated renal dysfunction and morphological changes in rats subjected to renal ischemia-reperfusion. These results clearly demonstrate the in vivo antioxidant effect and the therapeutic potential of trimetazidine, an anti-ischemic agent, in attenuating renal ischemia-reperfusion injury.
Collapse
Affiliation(s)
- H Kaur
- Pharmacology division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | | | |
Collapse
|
49
|
Abstract
Physiological stress is known to produce analgesia and memory disruption. A large body of evidence favors the nonopiate mediation of stress-induced analgesia. It is suggested that brain histamine mediates nonopiate analgesia and participates in learning and memory in rodents. Histamine is released during stress, although the nature of histaminergic involvement in stress response is not clearly defined. Therefore, we studied the effect of L-histidine and histamine-receptor antagonists on antinociception and impaired retention induced by immobilization stress. In the present study, immobilization stress produced a naloxone-resistant analgesia that was potentiated by L-histidine and antagonized by pretreatment with the histamine receptor antagonists chlorpheniramine and cimetidine. L-histidine attenuated the memory disruption induced by immobilization stress, which was significantly reversed by chlorpheniramine but not by cimetidine. Thus the involvement of the central histaminergic system, through histamine H1- and H2-receptors, may be speculated in analgesia and cognitive deficit induced by immobilization stress.
Collapse
Affiliation(s)
- V N Paul
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | | | |
Collapse
|
50
|
Satyanarayana PS, Singh D, Chopra K. Quercetin, a bioflavonoid, protects against oxidative stress-related renal dysfunction by cyclosporine in rats. Methods Find Exp Clin Pharmacol 2001; 23:175-81. [PMID: 11676225 DOI: 10.1358/mf.2001.23.4.634641] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Nephrotoxicity is the most common and clinically important side effect of cyclosporine (CsA). Recent evidence suggests that reactive oxygen species (ROS) play an important role in CsA nephrotoxicity. This study was designed to demonstrate the role of oxidative stress and its relation to renal dysfunction and to investigate the effects of quercetin, a bioflavonoid with antioxidant properties, in CsA-induced nephrotoxicity. Quercetin (0.5 and 2.0 mg/kg i.p.) was administered 24 h before and concurrently with CsA (20 mg/kg s.c.) for 21 days. Tissue lipid peroxidation was measured as thiobarbituric acid reacting substances (TBARS). Renal function was assessed by estimating plasma creatinine, blood urea nitrogen (BUN), creatinine and urea clearance. Renal morphological alterations were assessed histopathologically. Pretreatment with CsA (20 mg/kg s.c.) for 21 days produced elevated levels of TBARS and deteriorated renal function as assessed by increased plasma creatinine, BUN and decreased creatinine and urea clearance as compared to vehicle-treated rats. The kidneys of CsA-treated rats showed severe striped interstitial fibrosis, arteriopathy, glomerular basement thickening, tubular vacuolization and hyaline casts. Quercetin (2 mg/kg) markedly reduced elevated levels of TBARS and significantly attenuated renal dysfunction and morphological changes in CsA-treated rats. It is likely that quercetin, due to its antioxidant properties, prevented CsA-induced ROS and consequently CsA nephrotoxicity. These results clearly demonstrate the pivotal role of oxidative stress and its relation to renal dysfunction, and also point to the therapeutic potential of the natural antioxidant quercetin in CsA-induced nephrotoxicity.
Collapse
Affiliation(s)
- P S Satyanarayana
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | | | |
Collapse
|