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Kulkarni S, Gaikwad A, Bhoi N, Hade A, Kokwar M, Gulwade M. Isolation, purification and structure elucidation of eight saponin compounds from Calotropis gigantea. Nat Prod Res 2024:1-12. [PMID: 38534095 DOI: 10.1080/14786419.2024.2331605] [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: 08/10/2023] [Accepted: 03/10/2024] [Indexed: 03/28/2024]
Abstract
Identifying the active ingredient from plant extracts and establishing its safety and efficacy remains a challenge, so there is need to develop optimised Isolation and purification method to concentrate the natural product from plant resources. In the key content areas of Pharmaceutical, natural product Industry and food application. Asclepiadaceae perennial herb Calotropis gigantea has a long history of usage in folk medicine. The purpose of this study to isolate, purified and structure elucidation of the saponin compounds. As per the Literature study reported that, the saponin compounds remain a huge source for medicinal, are rich sources of chemical compounds having tremendous diversity with respect to structure, function and mechanism of action. In this study we selected Calotropis gigantea for the separation of the saponin. In the present study we successfully isolated, purified, elucidated the structure and identified the saponin compounds using HPLC and HR LC-MS techniques.
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Affiliation(s)
- Sudha Kulkarni
- Department of Biotechnology, Sinhgad College of Engineering, Pune, Maharashtra
| | - Ajit Gaikwad
- Department of Technology, Savitribai Phule Pune University, Pune, Maharashtra
| | - Nilesh Bhoi
- Department of Biotechnology, Sinhgad College of Engineering, Pune, Maharashtra
| | - Amit Hade
- Department of Biotechnology, Sinhgad College of Engineering, Pune, Maharashtra
| | - Mona Kokwar
- Department of Biotechnology, Sinhgad College of Engineering, Pune, Maharashtra
| | - Manali Gulwade
- Department of Biotechnology, Sinhgad College of Engineering, Pune, Maharashtra
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Yasa Benkli C, Marcogliese A, Elghetany M, Punia J, Fisher K, Curry C, El-Mallawany N, Allen C, McClain K, John T, Gaikwad A. Diagnostic Challenges And Clinical Implications For Systemic EBV-Associated T-Cell Lymphoproliferative Disorders Of Childhood. Am J Clin Pathol 2020. [DOI: 10.1093/ajcp/aqaa161.345] [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: 11/15/2022] Open
Abstract
Abstract
Introduction/Objective
Systemic EBV-associated T-cell lymphoproliferative disorders of childhood (S-EBV-T-LPD) comprise three major forms: EBV-positive hemophagocytic lymphohistiocytosis (EBV-HLH), systemic EBV-positive T- cell lymphoma (S-EBV-TCL), and systemic T-cell chronic active EBV infection (S-T-CAEBV). These disorders are rare in children and young adults in Western countries and are associated with poor outcomes. Frequently patients were treated initially for EBV-HLH and subsequently found to have relapsed/refractory EBV-HLH vs S-EBV-TCL or overt EBV+ TCL, the latter of which requires different therapy than EBV-HLH. We report the clinicopathologic findings of 13 cases, including 8 previously reported. (PMID: 31099136)
Methods
Thirteen cases of S-EBV-T-LPD were identified at Texas Children’s Hospital from 1990 to 2020. Clinicopathologic and relevant laboratory parameters were recorded.
Results
Patients included six females and seven males of Hispanic (n=6), Asian (4), and Caucasian origins (3) ages 1-22 years (median 2). All had fever, hepatosplenomegaly, cytopenias, abnormal EBV serologies, and significantly elevated peripheral blood EBV- DNA load by quantitative PCR. Histologic features were variable ranging from EBV+ T-cell infiltrates with subtle architectural distortion and mild atypia to overt morphologic appearance of lymphoma.
Consistent findings were aberrant T-cell populations identified by immunohistochemistry (n=4) or bone marrow flow cytometry (n=9, 1-50%, mean 16%). Five patients were classified as overt EBV+ TCL with abnormal karyotyping identified in 3. Seven patients had pathology findings indistinguishable between EBV-HLH and S-EBV-TCL and were classified as EBV-HLH/S-EBV-TCL. One patient had S-T-CAEBV. Outcomes were dismal after HLH-directed immuno/chemotherapy protocols with/without bone marrow transplant as only three EBV-HLH/S-EBV-TCL patients were alive at 1.5, 2.5 months, and 9 years follow-up.
Conclusion
This series from North America demonstrate challenges in the diagnosis and management of S-EBV-T- LPD cases. Particularly, EBV-HLH and S-EBV-TCL, which require vastly different treatment strategies, may initially present with overlapping clinicopathological features. Further studies are needed to address clear diagnostic criteria to guide appropriate management.
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Affiliation(s)
- C Yasa Benkli
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - A Marcogliese
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - M Elghetany
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - J Punia
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - K Fisher
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - C Curry
- Department of Pathology & Immunology, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - N El-Mallawany
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, Texas Children’s Cancer and Hematology Centers, Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - C Allen
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, Texas Children’s Cancer and Hematology Centers, Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - K McClain
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, Texas Children’s Cancer and Hematology Centers, Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - T John
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, Texas Children’s Cancer and Hematology Centers, Texas Children’s Hospital, Houston, Texas, UNITED STATES
| | - A Gaikwad
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, Texas Children’s Cancer and Hematology Centers, Texas Children’s Hospital, Houston, Texas, UNITED STATES
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Rohini MR, Sankaran M, Rajkumar S, Prakash K, Gaikwad A, Chaudhury R, Malik SK. Morphological characterization and analysis of genetic diversity and population structure in Citrus × jambhiri Lush. using SSR markers. Genet Resour Crop Evol 2020; 67:1259-1275. [DOI: 10.1007/s10722-020-00909-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 02/17/2020] [Indexed: 07/19/2023]
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Gupte AN, Selvaraju S, Paradkar M, Danasekaran K, Shivakumar SVBY, Thiruvengadam K, Dolla C, Shivaramakrishnan G, Pradhan N, Kohli R, John S, Raskar S, Jain D, Momin A, Subramanian B, Gaikwad A, Lokhande R, Suryavanshi N, Gupte N, Salvi S, Murali L, Checkley W, Golub JE, Bollinger R, Chandrasekaran P, Mave V, Gupta A. Respiratory health status is associated with treatment outcomes in pulmonary tuberculosis. Int J Tuberc Lung Dis 2020; 23:450-457. [PMID: 31064624 DOI: 10.5588/ijtld.18.0551] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
<sec id="st1"> <title>BACKGROUND</title> The association between respiratory impairment and tuberculosis (TB) treatment outcomes is not clear. </sec> <sec id="st2"> <title>METHODS</title> We prospectively evaluated respiratory health status, measured using the Saint George's Respiratory Questionnaire (SGRQ), in a cohort of new adult pulmonary TB cases during and up to 18 months following treatment in India. Associations between total SGRQ scores and poor treatment outcomes of failure, recurrence and all-cause death were measured using multivariable Poisson regression. </sec> <sec id="st3"> <title>RESULTS</title> We enrolled 455 participants contributing 619 person-years at risk; 39 failed treatment, 23 had recurrence and 16 died. The median age was 38 years (interquartile range 26-49); 147 (32%) ever smoked. SGRQ scores at treatment initiation were predictive of death during treatment (14% higher risk per 4-point increase in baseline SGRQ scores, 95%CI 2-28, P = 0.01). Improvement in SGRQ scores during treatment was associated with a lower risk of failure (1% lower risk for every per cent improvement during treatment, 95%CI 1-2, P = 0.05). Clinically relevant worsening in SGRQ scores following successful treatment was associated with a higher risk of recurrence (15% higher risk per 4-point increase scores, 95%CI 4-27, P = 0.004). </sec> <sec id="st4"> <title>CONCLUSION</title> Impaired respiratory health status was associated with poor TB treatment outcomes. The SGRQ may be used to monitor treatment response and predict the risk of death in pulmonary TB. </sec>.
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Affiliation(s)
- A N Gupte
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - S Selvaraju
- National Institute for Research in Tuberculosis, Chennai
| | - M Paradkar
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - K Danasekaran
- National Institute for Research in Tuberculosis, Chennai
| | | | | | - C Dolla
- National Institute for Research in Tuberculosis, Chennai
| | | | - N Pradhan
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - R Kohli
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - S John
- National Institute for Research in Tuberculosis, Chennai
| | - S Raskar
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - D Jain
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - A Momin
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - B Subramanian
- National Institute for Research in Tuberculosis, Chennai
| | - A Gaikwad
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - R Lokhande
- Byramjee Jeejeebhoy Government Medical College and Sassoon General Hospitals, Pune
| | - N Suryavanshi
- Byramjee Jeejeebhoy Government Medical College-Johns Hopkins University Clinical Research Site, Pune
| | - N Gupte
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - S Salvi
- Chest Research Foundation, Pune, India
| | - L Murali
- National Institute for Research in Tuberculosis, Chennai
| | - W Checkley
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - J E Golub
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - R Bollinger
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | - V Mave
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - A Gupta
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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5
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Arasaratnam RJ, Tzannou I, Gray T, Aguayo-Hiraldo PI, Kuvalekar M, Naik S, Gaikwad A, Liu H, Miloh T, Vera JF, Himes RW, Munoz FM, Leen AM. Dynamics of virus-specific T cell immunity in pediatric liver transplant recipients. Am J Transplant 2018; 18:2238-2249. [PMID: 29900673 PMCID: PMC6117219 DOI: 10.1111/ajt.14967] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 05/11/2018] [Accepted: 06/06/2018] [Indexed: 01/25/2023]
Abstract
Immunosuppression following solid organ transplantation (SOT) has a deleterious effect on cellular immunity leading to frequent and prolonged viral infections. To better understand the relationship between posttransplant immunosuppression and circulating virus-specific T cells, we prospectively monitored the frequency and function of T cells directed to a range of latent (CMV, EBV, HHV6, BK) and lytic (AdV) viruses in 16 children undergoing liver transplantation for up to 1 year posttransplant. Following transplant, there was an immediate decline in circulating virus-specific T cells, which recovered posttransplant, coincident with the introduction and subsequent routine tapering of immunosuppression. Furthermore, 12 of 14 infections/reactivations that occurred posttransplant were successfully controlled with immunosuppression reduction (and/or antiviral use) and in all cases we detected a temporal increase in the circulating frequency of virus-specific T cells directed against the infecting virus, which was absent in 2 cases where infections remained uncontrolled by the end of follow-up. Our study illustrates the dynamic changes in virus-specific T cells that occur in children following liver transplantation, driven both by active viral replication and modulation of immunosuppression.
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Affiliation(s)
- R J Arasaratnam
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - I Tzannou
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - T Gray
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - P I Aguayo-Hiraldo
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - M Kuvalekar
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - S Naik
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - A Gaikwad
- Department of Pediatric Hematology/Oncology, Texas Children's Cancer Center, Baylor College of Medicine, Houston, TX, USA
| | - H Liu
- Biostatistics Core of the Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, USA
| | - T Miloh
- Department of Pediatrics, Division of Pediatric Gastroenterology and Nutrition, Texas Children's Hospital, Houston, TX, USA
| | - J F Vera
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
| | - R W Himes
- Department of Pediatrics, Division of Pediatric Gastroenterology and Nutrition, Texas Children's Hospital, Houston, TX, USA
| | - F M Munoz
- Departments of Pediatrics, Infectious Diseases Section, and Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - A M Leen
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital and Houston Methodist Hospital, Houston, TX, USA
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6
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Gaikwad A, Khan S, Kadam S, Kadam K, Dighe V, Shah R, Kulkarni V, Kumaraswamy R, Gajbhiye R. The CFTR gene mild variants poly-T, TG repeats and M470V detection in Indian men with congenital bilateral absence of vas deferens. Andrologia 2017; 50. [PMID: 28776713 DOI: 10.1111/and.12858] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2017] [Indexed: 11/30/2022] Open
Abstract
The aim of the study was to detect the frequency of the CFTR gene variants poly-T, TG repeats and c.1408A>G p.Met470Val (M470V) in Indian men with congenital bilateral absence of the vas deferens (CBAVD). Men diagnosed with CBAVD (n = 76), their female partners (n = 76) and healthy men from general population (n = 50) were recruited. Genomic DNA was isolated and the polymorphic regions of IVS9- c.1210-12T [5] and M470V were amplified using specific primers followed by Sanger's DNA sequencing. A statistically significant increase in the frequency of heterozygous IVS9- c.1210-12T [5] (39.4%) was observed in CBAVD men as compared to controls (14%). The allelic distribution of c.1210-12T [5], c.1210-12T [7] and c.1210-12T [9] in CBAVD men was 21%, 64.4% and 13% and that in healthy controls was 7%, 73% and 20% respectively. Longest TG repeat c.1210-34TG [13] was found in association with c.1210-12T [5] with an allelic frequency of 5.9% in CBAVD men. We found a significant association of c.1210-34TG [12]/c.1210-34TG [13] - c.1210-12[5] -V470 allele in CBAVD men. Twelve female partners harboured a heterozygous c.1210-12T [5] allele. The study emphasises the need to screen both partners for the polymorphisms M470V, poly-T, TG tract repeats in addition to population-specific known CFTR gene mutations.
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Affiliation(s)
- A Gaikwad
- Department of Clinical Research, National Institute for Research in Reproductive Health, Mumbai, India.,Department of Anatomy and Developmental Biology, Monash University, VIC, 3800, Australia
| | - S Khan
- Department of Clinical Research, National Institute for Research in Reproductive Health, Mumbai, India
| | - S Kadam
- Department of Molecular Immunodiagnostics, National Institute for Research in Reproductive Health, Mumbai, India
| | - K Kadam
- Department of Gamete Immunobiology, National Institute for Research in Reproductive Health, Mumbai, India
| | - V Dighe
- National Center for Preclinical Reproductive and Genetic Toxicology, National Institute for Research in Reproductive Health, Mumbai, India
| | - R Shah
- Department of Clinical Research, National Institute for Research in Reproductive Health, Mumbai, India.,Lilavati Hospital and Research Center, Mumbai, India
| | - V Kulkarni
- Department of Clinical Research, National Institute for Research in Reproductive Health, Mumbai, India
| | | | - R Gajbhiye
- Department of Clinical Research, National Institute for Research in Reproductive Health, Mumbai, India
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Ramesh B, Ghosh AK, Prakash V, Sharma M, Rajaram S, Kar A, Gaikwad A, Pradhan NK, Krishnamurthy J, Crockett M, Avery L, Moses S, Blanchard J. Facility mapping: A tool for effective planning for MNCH services. Ann Glob Health 2015. [DOI: 10.1016/j.aogh.2015.02.692] [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: 10/23/2022] Open
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Pimpalkhute SA, Jaiswal KM, Sontakke SD, Bajait CS, Gaikwad A. Evaluation of awareness about pharmacovigilance and adverse drug reaction monitoring in resident doctors of a tertiary care teaching hospital. Indian J Med Sci 2012; 66:55-61. [PMID: 23603621] [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: 06/02/2023]
Abstract
OBJECTIVE Adverse drug reactions (ADRs) are associated with significant morbidity and mortality and have a major impact on public health. Pharmacovigilance helps in early detection of ADRs and identification of risk factors. Underreporting of ADRs can be improved by imparting knowledge regarding pharmacovigilance to healthcare professionals. This study was aimed at investigating the knowledge and attitude of resident doctors about ADR reporting and suggesting possible ways of improving ADR reporting. MATERIALS AND METHODS This study was a cross-sectional, questionnaire-based survey conducted in a tertiary care teaching hospital. The respondents were resident doctors. Study instrument was a self-developed, pre-validated, semi-structured questionnaire consisting of open- and close-ended items. RESULTS A total of 84 questionnaires were considered for analysis, giving a response rate of 93.33%. In all, 64.28% of the respondents were aware about pharmacovigilance, 52.38% were aware of ADR reporting system in India, 83.33% opined that only serious ADR with any medicine should be reported, and 35.72% believed that ADRs should be reported only for newly marketed agents. Although 67.85% of respondents observed an ADR, only 25% reported it; 44.04% were aware about the complete procedure of ADR reporting. General attitude of the respondents about ADR reporting was as follows: ADR reporting should be compulsory (15.19%), voluntary (41.66%), remunerated (3.57%), identity of prescriber should be concealed (21.42%), and identity of reporter should be concealed (29.7%). CONCLUSION Increasing awareness about pharmacovigilance will be helpful in improving the status of ADR reporting. Other measures such as making ADR reporting guidelines available in the form of booklets and displaying posters can also play a useful role.
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Pimpalkhute S, Jaiswal KM, Bajait CS, Gaikwad A, Sontakke SD. Evaluation of awareness about pharmacovigilance and adverse drug reaction monitoring in resident doctors of a tertiary care teaching hospital. ACTA ACUST UNITED AC 2012. [DOI: 10.4103/0019-5359.110902] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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10
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Julius JM, Gaikwad A, Lowry A, Lewis RE, Lozano RD, Dalrymple JL, Coleman RL, Smith JA. Defining the role of echinocandin catechol functional groups in the development of secondary hepatocellular carcinoma. J Antimicrob Chemother 2011; 67:422-9. [DOI: 10.1093/jac/dkr494] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [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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11
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Srinivasan KG, Gaikwad A, Kannan BRJ, Ritesh K, Ushanandini KP. Congenital coronary artery anomalies: diagnosis with 64 slice multidetector row computed tomography coronary angiography: a single-centre study. J Med Imaging Radiat Oncol 2008; 52:148-54. [PMID: 18373806 DOI: 10.1111/j.1440-1673.2008.01933.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Retrospective review of the congenital coronary artery (CA) anomalies detected by a 64-slice multidetector row computed tomographic (MDCT) angiography. The type of the anomaly, imaging characteristics, clinical relevance and the superiority of the MDCT over conventional coronary angiography are discussed. Multidetector row computed tomographic coronary angiography was carried out by the usual technique with 70 cc of non-ionic contrast agent and retrospective electrocardiogram gating. The volume data obtained were reconstructed in axial plane, along with volume-rendered three-dimensional reconstruction and virtual angioscopy in selected patients. The images were analysed by a radiologist, experienced in cardiac CT, and an experienced cardiologist. A retrospective review of the records was carried out, and subjects with congenital coronary anomalies were included in the study. Between 15 November 2005 and 27 February 2007, 1495 MDCT coronary angiograms were carried out. Eleven of them were found to have coronary anomalies. Five had absent left main CA. Two had interarterial course of the left main CA artery passing in between the right ventricular outflow tract and the root of aorta. In one patient, there was aberrant origin of right CA from the left aortic sinus with subsequent interarterial course and another one had aberrant origin of circumflex artery from the right aortic sinus. One patient each of congenitally absent circumflex artery and atresia of the right CA were found. Sixty-four slice MDCT coronary angiography provided accurate depiction of anomalous vessel origin and course along with the complex anatomical relation with the adjacent structures. CT can be considered as a first-line imaging method for delineating coronary arterial anomalies.
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Affiliation(s)
- K G Srinivasan
- KGS Advanced MR and CT Scan Centre, Madurai, Tamil Nadu, India.
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12
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Singh BK, Yadav AK, Kumar B, Gaikwad A, Sinha SK, Chaturvedi V, Tripathi RP. Preparation and reactions of sugar azides with alkynes: synthesis of sugar triazoles as antitubercular agents. Carbohydr Res 2008; 343:1153-62. [DOI: 10.1016/j.carres.2008.02.013] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2007] [Revised: 02/13/2008] [Accepted: 02/14/2008] [Indexed: 11/30/2022]
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13
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Deshmukh V, Gaikwad A. Open reduction of condylar fractures—A right treatment perspective? Int J Oral Maxillofac Surg 2007. [DOI: 10.1016/j.ijom.2007.08.412] [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: 10/22/2022]
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14
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Xu ZX, Liang J, Haridas V, Gaikwad A, Connolly FP, Mills GB, Gutterman JU. A plant triterpenoid, avicin D, induces autophagy by activation of AMP-activated protein kinase. Cell Death Differ 2007; 14:1948-57. [PMID: 17690712 DOI: 10.1038/sj.cdd.4402207] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Avicins, a family of plant triterpene electrophiles, can trigger apoptosis-associated tumor cell death, and suppress chemical-induced carcinogenesis by its anti-inflammatory, anti-mutagenic, and antioxidant properties. Here, we show that tumor cells treated with benzyloxycarbonylvalyl-alanyl-aspartic acid (O-methyl)-fluoro-methylketone, an apoptosis inhibitor, and Bax(-/-)Bak(-/-) apoptosis-resistant cells can still undergo cell death in response to avicin D treatment. We demonstrate that this non-apoptotic cell death is mediated by autophagy, which can be suppressed by chloroquine, an autophagy inhibitor, and by specific knockdown of autophagy-related gene-5 (Atg5) and Atg7. Avicin D decreases cellular ATP levels, stimulates the activation of AMP-activated protein kinase (AMPK), and inhibits mammalian target of rapamycin (mTOR) and S6 kinase activity. Suppression of AMPK by compound C and dominant-negative AMPK decreases avicin D-induced autophagic cell death. Furthermore, avicin D-induced autophagic cell death can be abrogated by knockdown of tuberous sclerosis complex 2 (TSC2), a key mediator linking AMPK to mTOR inhibition, suggesting that AMPK activation is a crucial event targeted by avicin D. These findings indicate the therapeutic potential of avicins by triggering autophagic cell death.
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Affiliation(s)
- Z-X Xu
- Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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15
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Mudalgi B, Gaikwad A, Prabhu S, Patil J. Glossopharyngeal neuralgia due to vascular compression by tortuous left posterior inferior cerebellar artery: a high strength (1.5 T) MRI study. Neuroradiol J 2007; 20:513-6. [PMID: 24299939 DOI: 10.1177/197140090702000507] [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] [Received: 04/21/2007] [Accepted: 06/07/2007] [Indexed: 11/17/2022] Open
Abstract
Glossopharyngeal neuralgia is a rare condition with a frequency about 1% of that of trigeminal neuralgia. Vascular compression is a common and treatable cause of glossopharyngeal neuralgia. Microvascular decompression of the glossopharyngeal nerve is an effective treatment option for patients in whom the disease is caused by compression of the nerve by a blood vessel. Pre-operative detection of the pathology on imaging has become possible with high strength MRI imaging. We describe the case of a 54-year-old man with left glossopharyngeal neuralgia. Constructive interference in steady-state (CISS) and flow sensitive Gradient Echo MRI sequences clearly demonstrated the compression of the IX nerve by the left posterior inferior cerebellar artery (PICA). The patient was operated upon and a Teflon graft was put in between the nerve and the vessel. The intra-operative photographs and post-operative images are also presented here. After surgery, the patient improved symptomatically with no recurrence of the symptoms in the follow-up period of about eight months.
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Affiliation(s)
- B Mudalgi
- Radio-Diagnosis Department, Apple Hospital & Research Institute; Kolhapur, India -
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16
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Manshouri T, Quintás-Cardama A, Nussenzveig R, Gaikwad A, Estrov Z, Cortes J, Kantarjian H, Verstovsek S. P033 The JAK kinase inhibitor CP-690,550 supresses the growth of human polycythemia vera cells carrying the JAK2V617F mutation. Leuk Res 2007. [DOI: 10.1016/s0145-2126(07)70381-8] [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: 11/25/2022]
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17
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Srinivasan K, Gaikwad A, Ushanandhini KP, Ritesh K. Lhermitte-duclos disease with syringomyelia. A report of two cases. Neuroradiol J 2007; 20:307-10. [PMID: 24299673 DOI: 10.1177/197140090702000311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2007] [Accepted: 04/03/2007] [Indexed: 11/15/2022] Open
Abstract
Dysplastic gangliocytoma is defined as a rare cerebellar mass lesion with malformative, hamartomatous and neoplastic features, arising from cerebellar neurons and affecting the population in early adulthood. Common clinical presentation is in the form of headache, features of raised intracranial tension or hydrocephalus. It may also be found as an incidental lesion. Even though many cases of this disease entity have been reported in literature, its association with syrinx is less commonly highlighted and hence we are reporting these two cases which we encountered at our institute. Presence of an associated syrinx should not deter one to make a preoperative diagnosis of this condition once the striking imaging findings are visualized.
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18
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Srinivasan KG, Gaikwad A, Ushanandhini KP, Ritesh K. Polyostotic Paget's Disease with Sarcomatous Change in a Skull Lesion. A Case Report of Imaging Findings. Neuroradiol J 2007; 20:373-6. [PMID: 24299684 DOI: 10.1177/197140090702000322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2007] [Accepted: 04/03/2007] [Indexed: 11/16/2022] Open
Abstract
The most serious complication of Paget's disease is sarcomatous degeneration of pagetic bone. Multifocal sarcomatous degeneration occurs mainly in polyostotic Paget's disease. Paget sarcomas are the most threatening sarcomas of bone irrespective of the histopathology, their prognosis being far more negative than primary sarcomas. Paget's disease is a common entity but osteosarcoma arising in Paget's disease is an infrequent complication. The skull involvement is even rarer. We report a case of malignant transformation of a skull lesion in a patient of polyostotic Paget's disease. Skull radiographs, computed tomography and magnetic resonance imaging scans of the tumour area show interesting results.
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19
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Tripathi RP, Saxena N, Tiwari VK, Verma SS, Chaturvedi V, Manju YK, Srivastva AK, Gaikwad A, Sinha S. Synthesis and antitubercular activity of substituted phenylmethyl- and pyridylmethyl amines. Bioorg Med Chem 2006; 14:8186-96. [PMID: 17010617 DOI: 10.1016/j.bmc.2006.09.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Revised: 09/09/2006] [Accepted: 09/12/2006] [Indexed: 11/29/2022]
Abstract
A total of 42 benzyl- and pyridylmethyl amines were synthesized either by reductive amination of aromatic/heteroaromatic aldehydes with amines or by conjugate addition of amines to the cinnamates followed by reduction of the ester group with lithium aluminium hydride to the respective propanolamines. All the synthesized compounds were evaluated against both avirulent and virulent strains of Mycobacterium tuberculosis. Many of the compounds exhibited MIC as low as 1.56microg/mL. Few of potent compounds were also evaluated against clinical isolates of MDR TB and found to be active at one or other concentrations with MIC as low as 3.12microg/mL.
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Affiliation(s)
- R P Tripathi
- Medicinal and Process Chemistry, Central Drug Research Institute, Lucknow 226001, India.
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20
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Tripathi RP, Verma SS, Pandey J, Agarwal KC, Chaturvedi V, Manju YK, Srivastva AK, Gaikwad A, Sinha S. Search of antitubercular activities in tetrahydroacridines: Synthesis and biological evaluation. Bioorg Med Chem Lett 2006; 16:5144-7. [PMID: 16870429 DOI: 10.1016/j.bmcl.2006.07.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 07/04/2006] [Accepted: 07/07/2006] [Indexed: 11/21/2022]
Abstract
A series of 9-substituted tetrahydroacridines were synthesized by nucleophilic substitution of chloro group with different nucleophiles in 9-chlorotetrahydroacridine (2). The latter could be obtained by POCl(3) mediated cyclization of the intermediate enamine, which in turn, was prepared by acid catalyzed condensation of anthranilic acid and cyclohexanone. Most of the compounds on antitubercular evaluation against M. tuberculosis H37 Rv and H37 Ra strains exhibited potent activities with MIC 6.125-0.78 microg/mL comparable to the standard drugs.
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Affiliation(s)
- R P Tripathi
- Medicinal and Process Chemistry Division, Central Drug Research Institute, Lucknow 226001, India.
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21
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Affiliation(s)
- J Jacob
- Department of Radio-Diagnosis, Medical Trust Hospital, Kochi-16,Kerala
| | - A Gaikwad
- Department of Radio-Diagnosis, Medical Trust Hospital, Kochi-16,Kerala
| | - P Ghadge
- Department of Radio-Diagnosis, Medical Trust Hospital, Kochi-16,Kerala
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22
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Tripathi RP, Tiwari VK, Tewari N, Katiyar D, Saxena N, Sinha S, Gaikwad A, Srivastava A, Chaturvedi V, Manju YK, Srivastava R, Srivastava BS. Synthesis and antitubercular activities of bis-glycosylated diamino alcohols. Bioorg Med Chem 2005; 13:5668-79. [PMID: 15955703 DOI: 10.1016/j.bmc.2005.05.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [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: 03/10/2005] [Revised: 05/13/2005] [Accepted: 05/13/2005] [Indexed: 11/26/2022]
Abstract
Conjugate addition of diamines to glycosyl olefinic esters 1a and 1b followed by reduction of resulting bis-glycosyl beta-amino esters (2-7 and 14-19) with lithium aluminium hydride led to the respective glycosyl amino alcohols (8-13 and 20-25) in moderate to good yields. All the compounds were evaluated for antitubercular activity against Mycobacterium tuberculosis H(37)Ra and H(37)Rv. Few of the compounds exhibited antitubercular activity with MIC as low as 6.25-3.12microg/mL in virulent and avirulent strains. Compound 13 was found to be active against MDR strain and showed mild protection in mice.
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Affiliation(s)
- R P Tripathi
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, Lucknow 226001, India.
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Katiyar D, Tiwari VK, Tewari N, Verma SS, Sinha S, Gaikwad A, Srivastava A, Chaturvedi V, Srivastava R, Srivastava BS, Tripathi RP. Synthesis and antimycobacterial activities of glycosylated amino alcohols and amines. Eur J Med Chem 2005; 40:351-60. [PMID: 15804534 DOI: 10.1016/j.ejmech.2004.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2004] [Revised: 12/09/2004] [Accepted: 12/13/2004] [Indexed: 11/20/2022]
Abstract
Reduction of glycosyl beta-amino esters (6-14 and 25-30) with lithium aluminum hydride resulted in glycosyl amino alcohols (15-23 and 31-36) in good yields. However, reductive amination of glycosyl aldehydes (1-3) with different amines in presence of sodium borohydride resulted in good to moderate yields of glycosyl amines (37-41). All the compounds were evaluated for antitubercular activity against Mycobacterium tuberculosis H37Ra and H37Rv. Compounds 18, 21, 35 and 36 exhibited antitubercular activities with MIC ranging from 6.25 to 3.12 microg ml(-1).
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Affiliation(s)
- D Katiyar
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, Lucknow 226001, India
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24
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Srivastava T, Gaikwad A, Haq W, Sinha S, Katti SB. Synthesis and biological evaluation of 4-thiazolidinone derivatives as potential antimycobacterial agents. ARKIVOC 2005. [DOI: 10.3998/ark.5550190.0006.209] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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25
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Gaikwad A, Biju KC, Muthal PL, Saha S, Subhedar N. Role of neuropeptide Y in the regulation of gonadotropin releasing hormone system in the forebrain of Clarias batrachus (Linn.): Immunocytochemistry and high performance liquid chromatography-electrospray ionization-mass spectrometric analysis. Neuroscience 2005; 133:267-79. [PMID: 15893649 DOI: 10.1016/j.neuroscience.2004.12.052] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [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: 06/26/2004] [Revised: 12/12/2004] [Accepted: 12/14/2004] [Indexed: 10/25/2022]
Abstract
Although the importance of neuropeptide Y (NPY) in the regulation of gonadotropin releasing hormone (GnRH) and reproduction has been highlighted in recent years, the neuroanatomical substrate within which these substances might interact has not been fully elucidated. Present work was undertaken with a view to define the anatomical-physiological correlates underlying the role exercised by NPY in the regulation of GnRH in the forebrain of the teleost Clarias batrachus. Application of double immunocytochemistry revealed close associations as well as colocalizations of the two peptides in the olfactory receptor neurons (ORNs), olfactory nerve fibers and their terminals in the glomeruli, ganglion cells of nervus terminalis, medial olfactory tract, fibers in the area ventralis telencephali/pars supracommissuralis and cells as well as fibers in the pituitary. NPY containing axons were found to terminate in the vicinity of GnRH cells in the pituitary with light as well as electron microscopy. Double immunoelectron microscopy demonstrated gold particles for NPY and GnRH colocalized on the membrane and in dense core of the secretory granules in the cells distributed in all components of the pituitary gland. To assess the physiological implication of these observations, NPY was injected via the intracranial route and the response of GnRH immunoreactive system was evaluated by relative quantitative morphometry as well as high performance liquid chromatography (HPLC) analysis. Two hours following NPY (20 ng/g body weight) administration, a dramatic increase was observed in the GnRH immunoreactivity in the ORNs, in the fibers of the olfactory bulb (163%) and medial olfactory tract (351%). High performance liquid chromatography-electrospray ionization-mass spectrometric analysis confirmed the immunocytochemical data. Significant rise in the salmon GnRH (sGnRH)-like peptide content was observed in the olfactory organ (194.23%), olfactory bulb (146.64%), telencephalon+preoptic area (214.10%) and the pituitary (136.72%) of the NPY-treated fish. However, GnRH in the hypothalamus was below detection limit in the control as well as NPY-treated fish. Present results suggest the involvement of NPY in the up-regulation of sGnRH containing system at different level of neuraxis extending from the olfactory epithelium to the pituitary in the forebrain of C. batrachus.
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Affiliation(s)
- A Gaikwad
- Department of Pharmaceutical Sciences, Nagpur University Campus, Nagpur 440 033, India
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26
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Tewari N, Tiwari VK, Tripathi RP, Chaturvedi V, Srivastava A, Srivastava R, Shukla PK, Chaturvedi AK, Gaikwad A, Sinha S, Srivastava BS. Synthesis of galactopyranosyl amino alcohols as a new class of antitubercular and antifungal agents. Bioorg Med Chem Lett 2004; 14:329-32. [PMID: 14698152 DOI: 10.1016/j.bmcl.2003.11.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [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: 11/21/2022]
Abstract
The galactopyranosyl amino alcohols (3-16) were synthesised by regioselective oxirane ring opening of compound 2 with variety of amines and screened for antitubercular and antifungal activities. One of the compounds (16) showed potent activity against Mycobacterium tuberculosis H37 Rv in vitro and also displayed activity in MDR TB. The compound (16) was found to be superior to ethambutol clinically used anti TB drug in in vitro screen.
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Affiliation(s)
- Neetu Tewari
- Division of Medicinal Chemistry, Central Drug Research Institute, -226001, Lucknow, India
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27
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Iyer VJ, Banerjee G, Govindram CB, Kamath V, Shinde S, Gaikwad A, Jerajani HR, Raman G, Cherian KM. Role of different valence states of chromium in the elicitation of allergic contact dermatitis. Contact Dermatitis 2002; 47:357-60. [PMID: 12581283 DOI: 10.1034/j.1600-0536.2002.470608.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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: 11/23/2022]
Abstract
Chromium, a known contact sensitizer, is present at high levels in certain detergent bars (40-50 p.p.m.) sold in India. A concern was whether chromium present in such detergent bars could sensitize users or their use lead to the elicitation of allergic contact dermatitis. Chromium present in detergent bars was analyzed for its valence state. It was found to be trivalent [Cr (III)] and not hexavalent [Cr (VI)]. An elicitation test on normal volunteers, as well as on volunteers who were sensitive to chromium, was carried out to determine the elicitation potential of chromium (III) in the bars. Of the 48 volunteers who completed the study, 30 did not show any positive response to either potassium dichromate, the positive control, or the detergent bar containing chromium (III). 18 volunteers who were identified as chromium-sensitive showed a positive response to potassium dichromate but not to the detergent bar containing trivalent chromium. This study clearly showed that the detergent bar with 40-50 p.p.m. of trivalent chromium did not elicit any allergic contact dermatitis even in individuals known to be chromium-sensitive. Hexavalent chromium (potassium dichromate) did however, elicit allergic contact dermatitis in these subjects.
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Affiliation(s)
- V J Iyer
- Environmental Safety Laboratory, Hindustan Lever Research Centre, Chakala, Andheri (E), Mumbai, India
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28
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Gaikwad A. Direct oxidation of hydrogen to hydrogen peroxide over Pd-containing fluorinated or sulfated Al2O3, ZrO2, CeO2, ThO2, Y2O3 and Ga2O3 catalysts in stirred slurry reactor at ambient conditions. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(01)00359-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Gaikwad A, Hop DV, Mukherjee SK. A 70-kDa chloroplast DNA polymerase from pea ( Pisum sativum) that shows high processivity and displays moderate fidelity. Mol Genet Genomics 2002; 267:45-56. [PMID: 11919714 DOI: 10.1007/s00438-001-0631-8] [Citation(s) in RCA: 9] [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] [Received: 09/03/2001] [Accepted: 12/06/2001] [Indexed: 11/28/2022]
Abstract
A 70-kDa chloroplast (ct) DNA polymerase from pea has been purified to apparent homogeneity. The ct DNA polymerase was insensitive to dideoxynucleotides (d(2) NTP) but showed high sensitivity to phosphonoacetic acid. The enzyme lacked any detectable 5'-->3' exonuclease activity but showed 3'-->5' exonuclease activity. The polymerase displayed high processivity (3 kb) and moderate fidelity, which may be sufficient for the faithful replication of the 140-kb pea ct genome. A 43-kDa accessory protein increased the polymerization rate but did not affect the rate of mis-incorporation in vitro, thus indicating that the domains for polymerisation and proof reading may be spatially separate.
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Affiliation(s)
- A Gaikwad
- Plant Molecular Biology, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
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Gaikwad A, Long DJ, Stringer JL, Jaiswal AK. In vivo role of NAD(P)H:quinone oxidoreductase 1 (NQO1) in the regulation of intracellular redox state and accumulation of abdominal adipose tissue. J Biol Chem 2001; 276:22559-64. [PMID: 11309386 DOI: 10.1074/jbc.m101053200] [Citation(s) in RCA: 164] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
NAD(P)H:quinone oxidoreductase 1 (NQO1) is a flavoprotein that utilizes NAD(P)H as an electron donor, catalyzing the two-electron reduction and detoxification of quinones and their derivatives. NQO1-/- mice deficient in NQO1 activity and protein were generated in our laboratory (Rajendirane, V., Joseph, P., Lee, Y. H., Kimura, S., Klein-Szanto, A. J. P., Gonzalez, F. J., and Jaiswal, A. K. (1998) J. Biol. Chem. 273, 7382-7389). Mice lacking a functional NQO1 gene (NQO1-/-) were born normal and reproduced adeptly as the wild-type NQO1+/+ mice. In the present report, we show that NQO1-/- mice exhibit significantly lower levels of abdominal adipose tissue as compared with the wild-type mice. The NQO1-/- mice showed lower blood levels of glucose, no change in insulin, and higher levels of triglycerides, beta-hydroxy butyrate, pyruvate, lactate, and glucagon as compared with wild-type mice. Insulin tolerance test demonstrated that the NQO1-/- mice are insulin resistant. The NQO1-/- mice livers also showed significantly higher levels of triglycerides, lactate, pyruvate, and glucose. The liver glycogen reserve was found decreased in NQO1-/- mice as compared with wild-type mice. The livers and kidneys from NQO1-/- mice also showed significantly lower levels of pyridine nucleotides but an increase in the reduced/oxidized NAD(P)H:NAD(P) ratio. These results suggested that loss of NQO1 activity alters the intracellular redox status by increasing the concentration of NAD(P)H. This leads to a reduction in pyridine nucleotide synthesis and reduced glucose and fatty acid metabolism. The alterations in metabolism due to redox changes result in a significant reduction in the amount of abdominal adipose tissue.
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Affiliation(s)
- A Gaikwad
- Department of Pharmacology, Baylor College of Medicine, Houston, Texas 77030, USA
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31
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Gaikwad A, Van Hop D, Mukherjee SK. Carboxy terminal region of a chloroplast DNA polymerase accessory factor stimulates DNA polymerase activity. Indian J Biochem Biophys 2000; 37:424-32. [PMID: 11355629] [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: 04/16/2023]
Abstract
p43, a glycoprotein of pea chloroplast (ct), acts as an accessory protein of pea chloroplast DNA polymerase. p43 binds to DNA, binds to ct-DNA polymerase and stimulates the ct-DNA polymerase activity. In the work presented here, the C-terminal domain of p43 (p22) has been overexpressed in E. coli. South Western analysis reveals that the recombinant p22 lacks in DNA binding activity. However, the recombinant p22 can form complex with the pea ct-DNA polymerase quite efficiently and stimulates the DNA polymerase activity to a greater extent than the native p43. Thus the DNA binding domain of p43 appears to be spatially separate from the domain responsible for the DNA polymerase accessory activity. The DNA binding domain is also highly O-glycosylated and loss of glycosylation of p43 leads to enhanced DNA binding as well as repression of ct-DNA polymerase activity. These findings allow us to propose a model to explain how glycosylation of p43 helps ct-DNA polymerase latch onto the DNA template for enhanced processivity. The predictive components of the model have been discussed.
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Affiliation(s)
- A Gaikwad
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India
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32
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Gaikwad A, Babbarwal V, Pant V, Mukherjee SK. Pea chloroplast FtsZ can form multimers and correct the thermosensitive defect of an Escherichia coli ftsZ mutant. Mol Gen Genet 2000; 263:213-21. [PMID: 10778739 DOI: 10.1007/s004380051162] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports the isolation and characterization of a cDNA encoding the FtsZ protein of pea. The protein is synthesised as a precursor molecule of 423 amino acids with a molecular mass of 44 kDa. When translated in vitro, the protein is translocated efficiently into isolated, intact pea chloroplasts, demonstrating that the protein is localised in the chloroplast. Pea FtsZ synthesised in vitro formed multimers in a calcium-dependent manner. The pea cDNA complemented the thermosensitive defect of an E. coli ftsZ mutant in vivo and converted the filamentous phenotype of the E. coli mutant into the normal wild-type morphology at 42 degrees C. However, pea FtsZ mutants that were defective in multimerisation in vitro failed to correct the phenotype of the E. coli ftsZ mutant in vivo. The pea ftsZ transcripts were abundantly present in the young leaves, but barely detectable in roots and stems and undetectable in older leaves. Light stimulated transcription of the gene significantly in young and dark-grown leaves. This study strongly suggests that the division mechanisms used by chloroplasts and bacteria show considerable similarity.
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Affiliation(s)
- A Gaikwad
- International Center for Genetic Engineering and Biotechnology, New Delhi, India
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33
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Ehtesham NZ, Phan TN, Gaikwad A, Sopory SK, Tuteja N. Calnexin from Pisum sativum: cloning of the cDNA and characterization of the encoded protein. DNA Cell Biol 1999; 18:853-62. [PMID: 10595399 DOI: 10.1089/104454999314854] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 11/13/2022] Open
Abstract
A full-length cDNA of 1951 bp encoding a calnexin (CNX) protein was cloned from a Pisum sativum expression library. The open reading frame (ORF) within this cDNA encodes a 551-amino acid protein with a calculated molecular mass of 62.47 kDa that exhibits extensive homology with the CNX proteins from soybean (80%), Arabidopsis thaliana (70%), maize (70%), and dog (39%). The characteristic CNX signature motifs, KPEDWDE and GXW, generally found in molecular chaperones, are present in pea CNX (PsCNX), along with putative sites for Ca2+ binding and phosphorylation. In PsCNX, a signal sequence and a single transmembrane domain are also present at the N- and C-terminal ends, respectively. The PsCNX protein is expressed constitutively at the RNA level in vegetative and flowering tissues, as was evident from Northern analysis. Expression of PsCNX was light independent. In vitro translation of PsCNX cDNA yielded a 75-kDa precursor, which, in the presence of canine microsomal membranes, was cotranslationally processed into a 72.5-kDa product and was imported and localized to the endoplasmic reticulum. Trypsin treatment of the in vitro translated PsCNX in the presence of canine microsomes generated a further processed 67-kDa intraluminal form. The results with PsCNX also showed that the plant protein is a phosphoprotein containing phosphoserine residues, as evidenced by immunoprecipitation of PsCNX with anti-phosphoserine antibody. The PsCNX protein was also phosphorylated by endogenous kinases of pea microsomes.
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Affiliation(s)
- N Z Ehtesham
- Plant Molecular Biology, International Center for Genetic Engineering and Biotechnology, New Delhi, India
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Gaikwad A, Tewari KK, Kumar D, Chen W, Mukherjee SK. Isolation and characterisation of the cDNA encoding a glycosylated accessory protein of pea chloroplast DNA polymerase. Nucleic Acids Res 1999; 27:3120-9. [PMID: 10454608 PMCID: PMC148538 DOI: 10.1093/nar/27.15.3120] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/12/2022] Open
Abstract
The cDNA encoding p43, a DNA binding protein from pea chloroplasts (ct) that binds to cognate DNA polymerase and stimulates the polymerase activity, has been cloned and characterised. The characteristic sequence motifs of hydroxyproline-rich glyco-proteins (HRGP) are present in the cDNA corres-ponding to the N-terminal domain of the mature p43. The protein was found to be highly O-arabinosylated. Chemically deglycosylated p43 (i.e. p29) retains its binding to both DNA and pea ct-DNA polymerase but fails to stimulate the DNA polymerase activity. The mature p43 is synthesised as a pre-p43 protein containing a 59 amino acid long transit peptide which undergoes stromal cleavage as evidenced from the post-translational in vitro import of the precursor protein into the isolated intact pea chloroplasts. Surprisingly, p43 is found only in pea chloroplasts. The unique features present in the cloned cDNA indicate that p43 is a novel member of the HRGP family of proteins. Besides p43, no other DNA-polymerase accessory protein with O-glycosylation has been reported yet.
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Affiliation(s)
- A Gaikwad
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India
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35
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Gaikwad A, Yadav BS, Reddy MK, Sopory S, Mukherjee SK. Suppression of pea nuclear topoisomerase I enzyme activity by pea PCNA. Plant J 1999; 19:153-162. [PMID: 10476062 DOI: 10.1046/j.1365-313x.1999.00510.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Proliferating cell nuclear antigen (PCNA), a highly conserved DNA polymerase accessory protein of eukary- otic kingdom, has not been studied thoroughly in bio- chemical terms in plants. We describe the isolation of the cDNA encoding PCNA from the pea cDNA library using the PCR approach. The cDNA was used for expression of pea PCNA in bacteria as a fusion protein (GST.PCNA) with the GST tag at the amino terminal end. The GST.PCNA stimulated the partially purified pea DNA polymerases approximately 30-fold. The stimulation was due to the oligomeric form of GST.PCNA. The pea PCNA interacted with the recombinant type I pea topoiso- merase as well as the native pea nuclear topoisomerase I and repressed the DNA relaxation activities. However, the DNA binding activity of Topo I remained undisturbed in the presence of high amounts of PCNA, thereby signify- ing that the catalysis of Topo I was probably affected by PCNA.
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Talib SH, Gaikwad A, Jirwankar PS. Protean manifestations of malaria--(multi organ dysfunction syndrome). INDIAN J PATHOL MICR 1996; 39:473-6. [PMID: 9002375] [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: 02/03/2023] Open
Abstract
Malaria may present with Multi System Organ Failure (MSOF) or Single System Organ Failure (SSOF). Thirteen cases of malaria are presented for their protean manifestations. Five patients presented for chronic urticaria with or without polyarticular arthritis, another mimicking acute rheumatic arthritis. A case of reactivation of pulmonary tuberculosis and the other to with apparent chloroquin resistant malaria who responded to combination of verapamil and chloroquin. A case developing Guillain Barre syndrome and another complicating into dilated cardiomyopathy are the rarities. All the cases are described and the pathogenesis is discussed in detail.
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Affiliation(s)
- S H Talib
- Department of Medicine, Govt. Medical College and Hospital, Aurangabad
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Chen W, Gaikwad A, Mukherjee SK, Choudhary NR, Kumar D, Tewari KK. A 43 kDa DNA binding protein from the pea chloroplast interacts with and stimulates the cognate DNA polymerase. Nucleic Acids Res 1996; 24:3953-61. [PMID: 8918797 PMCID: PMC146191 DOI: 10.1093/nar/24.20.3953] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 02/03/2023] Open
Abstract
A DNA binding protein with DNA polymerase 'accessory activity' has been identified and purified to apparent homogeneity from pea chloroplasts. This protein consists of a single subunit of 43 kDa and binds to DNA regardless of its base sequence and topology. It increases cognate DNA polymerase-primase activity in a dose dependent manner. Using solid phase protein-protein interaction trapping and co-immunoprecipitation techniques, the purified protein was found to associate with the chloroplast DNA polymerase. The chloroplast DNA polymerase also binds directly to the radioiodinated 43 kDa protein. The specific interaction between 43 kDa protein and chloroplast DNA polymerase results in the synthesis of longer DNA chains. The 43 kDa protein, present abundantly in the pea chloroplast, appears to increase processivity of the chloroplast DNA polymerase and may play an important role in the replication of pea chloroplast DNA.
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Affiliation(s)
- W Chen
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, India
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Pérez-Bendito D, Gómez-Hens A, Gaikwad A. Direct stopped-flow fluorescence polarization immunoassay of abused drugs and their metabolites in urine. Clin Chem 1994; 40:1489-93. [PMID: 8044987] [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: 01/28/2023]
Abstract
Kinetic methodology was applied to the direct determination of abused drugs (amphetamines, cocaine, and cannabinoids) in urine by stopped-flow fluorescence polarization immunoassay (SF-FPIA). This technique provides analytical data within a few seconds by measuring the variation of polarized fluorescence with time during development of immunochemical reactions. Methods based on this principle are particularly suitable for routine screening of these drugs in urine, being more expeditious than conventional FPIA methods. The dynamic ranges of the calibration curves were 20-300 micrograms/L for d,l-amphetamine, 15-300 micrograms/L for benzoylecgonine (a cocaine metabolite), and 10-400 micrograms/L for 11-nor-delta 8-tetrahydrocannabinol-9-carboxylic acid (a cannabinoid metabolite). The detection limits and within- and between-assay precision were better than those provided by conventional FPIA. Analytical recoveries ranged between 97.5% for d,l-amphetamine and 102.4% for the cannabinoid metabolite. The results for the three analytes were consistent with those obtained by conventional FPIA.
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Affiliation(s)
- D Pérez-Bendito
- Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Spain
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Abstract
Abstract
Kinetic methodology was applied to the direct determination of abused drugs (amphetamines, cocaine, and cannabinoids) in urine by stopped-flow fluorescence polarization immunoassay (SF-FPIA). This technique provides analytical data within a few seconds by measuring the variation of polarized fluorescence with time during development of immunochemical reactions. Methods based on this principle are particularly suitable for routine screening of these drugs in urine, being more expeditious than conventional FPIA methods. The dynamic ranges of the calibration curves were 20-300 micrograms/L for d,l-amphetamine, 15-300 micrograms/L for benzoylecgonine (a cocaine metabolite), and 10-400 micrograms/L for 11-nor-delta 8-tetrahydrocannabinol-9-carboxylic acid (a cannabinoid metabolite). The detection limits and within- and between-assay precision were better than those provided by conventional FPIA. Analytical recoveries ranged between 97.5% for d,l-amphetamine and 102.4% for the cannabinoid metabolite. The results for the three analytes were consistent with those obtained by conventional FPIA.
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Affiliation(s)
- D Pérez-Bendito
- Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Spain
| | - A Gómez-Hens
- Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Spain
| | - A Gaikwad
- Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Spain
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Shende RK, Bardapurker J, Patil V, Gaikwad A. Adenosine deaminase activity in leprosy. Indian J Lepr 1993; 65:201-5. [PMID: 8345233] [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
Serum adenosine deaminase (ADA) was studied in 60 patients of different types of leprosy and 50 healthy control subjects. ADA levels in patients with tuberculoid (50.50 +/- 5.22 U/L), borderline (41.14 +/- 3.89 U/L) and lepromatous leprosy (30.10 +/- .03 U/L) were higher than that in controls (17.84 +/- 2.78 U/L), thus correlating with the immunological status of patients. Patients with lepra reaction showed decreased ADA levels and higher grade of lepromin test positivity was associated with increased ADA activity.
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Affiliation(s)
- R K Shende
- Department of Medicine, Govt Medical College & Hospital, Aurangabad
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Gaikwad A, Gómez-Hens A, Pérez-Bendito D. Kinetic Fluorimetric Method for the Determination of Tobramycin by Stopped-Flow Mixing Methodology. ANAL LETT 1993. [DOI: 10.1080/00032719308016798] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Gaikwad A, Ramasarma T, Kurup CK. Regulation of respiratory activity of brown adipose tissue mitochondria through changes in cytochromes. Biotechnol Appl Biochem 1990; 12:562-6. [PMID: 2288713] [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: 12/31/2022]
Abstract
Exposure of cold-acclimatized rats to heat (37 degrees C) for a short period decreased brown adipose tissue (BAT) mitochondrial substrate-dependent oxygen uptake and H2O2 generation. Both the concentration and substrate-dependent rate of cytochrome b reduction decreased as early as 3 h of heat exposure. These results identify cytochrome b as the locus of regulation of electron transport in BAT mitochondria under conditions of heat stress.
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Affiliation(s)
- A Gaikwad
- Department of Biochemistry, Indian Institute of Science, Bangalore
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Gaikwad A, Khedker MY, Rao BN, Malhotra AK. Leprosy in a patient with chronic lymphatic leukaemia. Indian J Lepr 1990; 62:233-5. [PMID: 2212743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- A Gaikwad
- Radiotherapy and Medical Oncology, Medical College and Hospital, Aurangabad
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