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Dorrance AM, Neviani P, Ferenchak GJ, Huang X, Nicolet D, Maharry KS, Ozer HG, Hoellarbauer P, Khalife J, Hill EB, Yadav M, Bolon BN, Lee RJ, Lee LJ, Croce CM, Garzon R, Caligiuri MA, Bloomfield CD, Marcucci G. Targeting leukemia stem cells in vivo with antagomiR-126 nanoparticles in acute myeloid leukemia. Leukemia 2015; 29:2143-53. [PMID: 26055302 PMCID: PMC4633325 DOI: 10.1038/leu.2015.139] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/15/2015] [Accepted: 05/06/2015] [Indexed: 12/31/2022]
Abstract
Current treatments for acute myeloid leukemia (AML) are designed to target rapidly dividing blast populations with limited success in eradicating the functionally distinct leukemia stem cell (LSC) population, which is postulated to be responsible for disease resistance and relapse. We have previously reported high miR-126 expression levels to be associated with a LSC-gene expression profile. Therefore, we hypothesized that miR-126 contributes to “stemness” and is a viable target for eliminating the LSC in AML. Here we first validate the clinical relevance of miR-126 expression in AML by showing that higher expression of this microRNA (miR) is associated with worse outcome in a large cohort of older (≥60 years) cytogenetically normal AML patients treated with conventional chemotherapy. We then show that miR-126 overexpression characterizes AML LSC-enriched cell subpopulations and contributes to LSC long-term maintenance and self-renewal. Finally, we demonstrate the feasibility of therapeutic targeting of miR-126 in LSCs with novel targeting nanoparticles (NP) containing antagomiR-126 resulting in in vivo reduction of LSCs likely by depletion of the quiescent cell subpopulation. Our findings suggest that by targeting a single miR, i.e., miR-126, it is possible to interfere with LSC activity, thereby opening potentially novel therapeutic approaches to treat AML patients.
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Nagarjuna D, Mittal G, Dhanda RS, Verma PK, Gaind R, Yadav M. Faecal Escherichia coli isolates show potential to cause endogenous infection in patients admitted to the ICU in a tertiary care hospital. New Microbes New Infect 2015; 7:57-66. [PMID: 26257914 PMCID: PMC4522595 DOI: 10.1016/j.nmni.2015.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 05/08/2015] [Accepted: 05/26/2015] [Indexed: 12/05/2022] Open
Abstract
Nosocomial infections are acquired during hospital treatment or in a hospital environment. One such infecting agent, Escherichia coli, harbours many virulence genes that enable it to become pathogenic, causing damage to the host. The mechanism of the E. coli virulence factors provenance to cause infection in host environments is not clearly elucidated. We investigated the virulence and pathogenicity of E. coli affected by the host environment. For this, blood (n = 78) and faecal (n = 83) E. coli isolates were collected from patients with and without sepsis, respectively, who had been admitted to the intensive care unit. The E. coli genomic DNA was isolated; the phylogenetic grouping was conducted by triplex PCR. The occurrence of nine virulence genes among the all the isolates was confirmed by gene-specific PCR. The prevalence of E. coli in blood isolates was more in phylogenetic groups B2 and D compared to groups A and B1. However, in faecal isolates, there was no significant difference. The prevalence of adhesin and toxin (papG, sfa, afa, cnf1, hlyA) genes was higher in blood compared to faecal E. coli isolates. However, the prevalence of aer, traT and PAI was similar as well as higher among both of these groups. These observations indicate a role of external environment (hospital setting) on host susceptibility (development of infection) in the faecal E. coli isolates, thereby making the patient prone to a sepsis condition.
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Nand N, Dsouza S, Batra N, Chauhan V, Yadav M. Intravenous Pantoprazole-Induced Near Fatality. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 2015; 63:96. [PMID: 26710417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Nagarjuna D, Dhanda RS, Gaind R, Yadav M. tcpC as a prospective new virulence marker in blood Escherichia coli isolates from sepsis patients admitted to the intensive care unit. New Microbes New Infect 2015; 7:28-30. [PMID: 26137310 PMCID: PMC4484543 DOI: 10.1016/j.nmni.2015.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 04/18/2015] [Accepted: 05/06/2015] [Indexed: 01/15/2023] Open
Abstract
The prevalence of the tcpC in the blood Escherichia coli isolates collected from the sepsis patients admitted to the intensive care unit was investigated for the first time. The blood and faecal samples were collected from sepsis and nonsepsis patients, respectively. The prevalence of the tcpC and phylogroups was confirmed by gene-specific PCR. The occurrence of the tcpC in the blood E. coli isolates from sepsis patients was significantly higher than the faecal isolates. The higher prevalence of blood E. coli isolates among the pathogenic groups (B2, D) compared to the commensal groups (A, B1) suggests tcpC as a prospective new virulence marker for sepsis.
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Yadav S, Sisodia N, Jha V, Yadav M. Dental exarticulation. Niger J Clin Pract 2015; 18:426-8. [PMID: 25772931 DOI: 10.4103/1119-3077.151804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Tooth exarticulation or avulsion refers to the complete displacement of the tooth out of its socket. It is a complex injury, requiring immediate intervention for optimal results. Literature indicates that prolonged dry time and improper handling may be associated with increased risk of failure. Immediate replantation of the tooth allows for immediate restoration of esthetics and phonetics. This case report presents the management of an avulsed mature tooth in a young boy, with a two-year follow-up, which had been preserved in milk after around 15-20 minutes of injury and transplanted after two hours at a dental hospital. Timely modified endodontic therapy prevented subsequent inflammatory root resorption.
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Yadav M, Sinha RR, Kumar S, Sarkar TK. Corrosion inhibition effect of spiropyrimidinethiones on mild steel in 15% HCl solution: insight from electrochemical and quantum studies. RSC Adv 2015. [DOI: 10.1039/c5ra14406j] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effect of synthesized spiropyrimidinethiones on the corrosion of mild steel in 15% HCl solution was investigated by using weight loss and electrochemical methods.
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Malla N, Goyal K, Dhanda RS, Yadav M. Immunity in urogenital protozoa. Parasite Immunol 2014; 36:400-8. [PMID: 25201404 DOI: 10.1111/pim.12114] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 03/20/2014] [Indexed: 01/15/2023]
Abstract
Innate and adaptive immunity play a significant role in urogenital infections. Innate immunity is provided by the epithelial cells and mucus lining along with acidic pH, which forms a strong physical barrier against the pathogens in female reproductive tract. Cells of innate immune system, antimicrobial peptides, cytokines, chemokines and adaptive immunity in the reproductive tract are evolved during infection, and a pro-inflammatory response is generated to fight against the invading pathogen Trichomonas vaginalis, a primary urogenital protozoa, the etiological agent of human trichomoniasis, a curable sexually transmitted infection. The involvement of the urogenital tract by other protozoal infections such as P. falciparum, Trypanosoma, Leishmania, Toxoplasma, Entamoeba histolytica and Acanthamoeba infection is rarely reported. Trichomonas induce pro-inflammatory and immunosuppressive responses in infected subjects. Multifactorial pathogenic mechanisms including parasite adherence, cysteine proteases, lipophosphoglycan, free radical, cytokine generation and Toll-like receptors appear to interplay with the induction of local and systemic immune responses that ultimately determine the outcome of the infection. However, the involvement of urogenital pathogen-specific immune mechanisms and effect of normal local resident flora on the outcome (symptomatic vs. asymptomatic) of infection are poorly understood. Moreover, immune interactions in trichomoniasis subjects co-infected with bacterial and viral pathogens need to be elucidated.
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Yadav M, Trivedi V, Upadhyay V, Shah G, Shah H, Upadhyay A, Goswami S, Shrivastav PS. Sensitive, selective and rapid determination of lafutidine in human plasma by solid phase extraction-liquid chromatography-tandem mass spectrometry. JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1134/s1061934814050116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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84
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Ricardo-Carter C, Favila M, Polando RE, Cotton RN, Bogard Horner K, Condon D, Ballhorn W, Whitcomb JP, Yadav M, Geister RL, Schorey JS, McDowell MA. Leishmania major inhibits IL-12 in macrophages by signalling through CR3 (CD11b/CD18) and down-regulation of ETS-mediated transcription. Parasite Immunol 2014; 35:409-20. [PMID: 23834512 DOI: 10.1111/pim.12049] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 06/03/2013] [Indexed: 01/17/2023]
Abstract
Leishmania major is an aetiological agent of cutaneous leishmaniasis. The parasite primarily infects immune sentinel cells, specifically macrophages and dendritic cells, in the mammalian host. Infection is receptor mediated and is known to involve parasite binding to cell surface protein complement receptor 3 (CR3, Mac-1, CD11b/CD18). Engagement of CR3 by various ligands inhibits production of interleukin-12 (IL-12), the cytokine that drives antileishmanial T helper 1-type immune responses. Likewise, L. major infection inhibits IL-12 production and activation of host macrophages. Our data indicate that in the absence of CR3, L. major-infected bone marrow-derived macrophages produce more IL-12 and nitric oxide compared with WT cells upon lipopolysaccharide (LPS) stimulation. We therefore investigated multiple signalling pathways by which L. major may inhibit IL-12 transcription through CR3 ligation. We demonstrate that L. major infection does not elicit significant NFκB p65, MAPK, IRF-1 or IRF-8 activation in WT or CD11b-deficient macrophages. Furthermore, infection neither inhibits LPS-induced MAPK or NFκB activation nor blocks IFN-γ-activated IRF-1 and IRF-8. ETS-mediated transcription, however, is inhibited by L. major infection independently of CR3. Our data indicate that L. major-mediated inhibition of IL-12 occurs through CR3 engagement; however, the mechanism of inhibition is independent of NFκB, MAPK, IRF and ETS.
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Khan MP, Mishra JS, Sharan K, Yadav M, Singh AK, Srivastava A, Kumar S, Bhaduaria S, Maurya R, Sanyal S, Chattopadhyay N. A novel flavonoid C-glucoside from Ulmus wallichiana preserves bone mineral density, microarchitecture and biomechanical properties in the presence of glucocorticoid by promoting osteoblast survival: a comparative study with human parathyroid hormone. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2013; 20:1256-66. [PMID: 23928508 DOI: 10.1016/j.phymed.2013.07.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Revised: 05/31/2013] [Accepted: 07/09/2013] [Indexed: 05/23/2023]
Abstract
PURPOSE 6-C-β-D-glucopyranosyl-(2S,3S)-(+)-5,7,3',4'-tetrahydroxydihydroflavonol (GTDF) is a novel compound isolated from Ulmus wallichiana, reported to have bone anabolic action in ovariectomized rats. Here, we studied the effect of GTDF in glucocorticoid (GC)-induced bone loss and its mode of action. METHODS Osteoblasts were cultured from rat calvaria or bone marrow to study apoptosis and differentiation by dexamethasone (Dex), methylprednisolone (MP), GTDF, quercetin and rutin. Female Sprague Dawley rats were treated with Dex or MP with or without GTDF or PTH. Efficacy was evaluated by bone microarchitecture using microcomputed tomography, determination of new bone formation by fluorescent labeling of bone and osteoblast apoptosis by co-labeling bone sections with Runx-2 and TUNEL. Serum osteocalcin was determined by ELISA. RESULTS GTDF preserved trabecular and cortical bones in the presence of Dex and MP and mitigated the MP-mediated suppression of serum osteocalcin. Co-administration of GTDF to MP rats increased mineral apposition, bone formation rates, bone biomechanical strength, reduced osteoblast apoptosis and increased osteogenic differentiation of bone marrow stromal cells compared to MP group, suggesting in vivo osteogenic effect of GTDF. These effects of GTDF were to a great extent comparable to PTH. GTDF prevented GC-induced osteoblast apoptosis by inhibiting p53 expression and acetylation, and activation of AKT but did not influence transactivation of GC receptor (GR). CONCLUSIONS GTDF protects against GC-induced bone loss by promoting osteoblast survival through p53 inhibition and activation of AKT pathways but not as a GR antagonist. GTDF has the potential in the management of GC-induced osteopenia.
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Pandey P, Ansari AA, Moda P, Yadav M. Enamel microabrasion for aesthetic management of dental fluorosis. CASE REPORTS 2013; 2013:bcr-2013-010517. [DOI: 10.1136/bcr-2013-010517] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Ranjan P, Kumari A, Das R, Gupta L, Singh SK, Yadav M. Evaluation of clinical features scoring system as screening tool for influenza A (H1N1) in epidemic situations. J Postgrad Med 2013; 58:265-9. [PMID: 23298921 DOI: 10.4103/0022-3859.105446] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Influenza A (H1N1) hit the headlines in recent times and created mass hysteria and general panic. The high cost and non-availability of diagnostic laboratory tests for swine flu, especially in the developing countries underlines the need of having a cheaper, easily available, yet reasonably accurate screening test. AIMS This study was carried out to develop a clinical feature-based scoring system (CFSS) for influenza A (H1N1) and to evaluate its suitability as a screening tool when large numbers of influenza-like illness cases are suspect. SETTINGS AND DESIGN Clinical-record based study, carried out retrospectively in post-pandemic period on subject's case-sheets who had been quarantined at IG International Airport's quarantine center at Delhi. MATERIALS AND METHODS Clinical scoring of each suspected case was done by studying their case record sheet and compared with the results of RT-PCR. RT-PCR was used to confirm the diagnosis (Gold Standard). STATISTICAL ANALYSIS We calculated sensitivity, specificity, positive and negative predictive values of the clinical feature-based scoring system (the proposed new screening tool) at different cut-off values. The most discriminant cut-off value was determined by plotting the ROC curve. RESULTS Of the 638 suspected cases, 127 (20%) were confirmed to have H1N1 by RT-PCR examination. On the basis of ROC, the most discriminant clinical feature score for diagnosing Influenza A was found to be 7, which yielded sensitivity, specificity, positive, and negative predictive values of 86%, 88%, 64%, and 96%, respectively. CONCLUSION The clinical features scoring system (CFSS) can be used as a valid and cost-effective tool for screening swine flu (influenza A (H1N1)) cases from large number of influenza-like illness suspects.
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Yadav M, Singh SK, Yadava S. Purification, characterisation and coal depolymerisation activity of lignin peroxidase from Lenzitus betulina MTCC-1183. PRIKLADNAIA BIOKHIMIIA I MIKROBIOLOGIIA 2012; 48:646-652. [PMID: 23330392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Lignin peroxidase from the culture filtrate of Lenzitus betulina MTCC-1183 has been purified to homogeneity using concentration by ultrafiltration and anion exchange chromatography on DEAE cellulose. The molecular weight of the purified lignin peroxidase using SDS-PAGE analysis was 43 kDa. Specific activity of the enzyme was 29.58 IU/mg. The K(m) values for veratryl alcohol and H2O2 for the purified enzyme were 54 microM and 81 microM, respectively. The k(cat) value of the purified enzyme was 2.3 s(-1) using 3,4-dimethoxybenzyl alcohol as the substrate. The optimal conditions for the lignin peroxidase assay were detected at pH 2.4 and 22 degrees C. Thermal stability of the purified enzyme has also been studied and its activation energy for deactivation was 287 kJ/mol. The purified lignin peroxidase depolymerised humic acid in presence of H2O2. Depolymerisation of coal by the L. betulina MTCC-1183 has been demonstrated using humic acid as a model of coal.
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Rautela BS, Yadav M, Bourai AA, Joshi V, Gusain GS, Ramola RC. Study of natural radionuclide and absorbed gamma dose in Ukhimath area of Garhwal Himalaya, India. RADIATION PROTECTION DOSIMETRY 2012; 152:58-61. [PMID: 22908360 DOI: 10.1093/rpd/ncs187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Natural radiation is the largest contributor to the collective radiation dose of the world population. It is widely distributed in different geological formations such as soil, rocks, air and groundwater. In the present investigation, (226)Ra, (232)Th and (40)K were measured in soil samples of the Ukhimath region of Garhwal Himalaya, India using NaI(Tl) gamma-ray spectrometry. The activity concentrations of naturally occurring radionuclides (226)Ra, (232)Th and (40)K were found to vary from 38.4 ± 6.1 to 141.7 ± 11.9 Bq kg(-1) with an average of 80.5 Bq kg(-1), 57.0 ± 7.5 to 155.9 ± 12.4 Bq kg(-1) with an average of 118.9 Bq kg(-1) and 9.0 ± 3.0 to 672.8 ± 25.9 Bq kg(-1) with an average of 341 Bq kg(-1), respectively. The total absorbed gamma dose rate varies from 70.4 to 169.1 nGy h(-1) with an average of 123.4 nGy h(-1). This study is important to generate a baseline data of radiation exposure in the area. Health hazard effects due to natural radiation exposure are discussed in details.
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Yadav M, Singh SK, Yadava S. Purification, characterisation and coal depolymerisation activity of lignin peroxidase from Lenzitus betulina MTCC-1183. APPL BIOCHEM MICRO+ 2012. [DOI: 10.1134/s0003683812050146] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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91
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Yadav M, Joshi P, Koirala P, Ghimire S, Safi S, Shrestha I, Ojha N, Amatya A, Gurung G, Rana A. Post Caesarean Caecal Perforation with Fecal Peritonitis. NEPAL JOURNAL OF OBSTETRICS AND GYNAECOLOGY 2012. [DOI: 10.3126/njog.v6i2.6762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
NJOG 2011 Nov-Dec; 6 (2): 58-59 DOI: http://dx.doi.org/10.3126/njog.v6i2.6762
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Goyal RK, Yadav M. Study on wear and friction behavior of graphite flake-filled PTFE composites. J Appl Polym Sci 2012. [DOI: 10.1002/app.37707] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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93
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Nagpal R, Behare PV, Kumar M, Mohania D, Yadav M, Jain S, Menon S, Parkash O, Marotta F, Minelli E, Henry CJK, Yadav H. Milk, milk products, and disease free health: an updated overview. Crit Rev Food Sci Nutr 2012; 52:321-33. [PMID: 22332596 DOI: 10.1080/10408398.2010.500231] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The cow and its milk have been held sacred in the world since the dawn of human civilization. Indian ancient Vedic texts describe the virtues of milk and dairy products, as is authenticated by modern scientific principles and proofs. Therefore, milk has been considered as one of the most natural and highly nutritive part of a daily balanced diet. Currently, the integration of advanced scientific knowledge with traditional information is gaining incredible momentum toward developing the concept of potential therapeutic foods. Furthermore, new advances toward understanding the therapeutic roles of milk and milk products have also given a new impetus for unraveling the age old secrets of milk. At present, the best-known examples of therapeutic foods are fermented milk products containing health promoting probiotic bacteria. In the present article, we have tried to review the various aspects of the therapeutic nature of milk and fermented dairy products in a highly up-dated manner, and offer an in-depth insight into the development of targeted therapeutic future foods as per the requirements of consumers.
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Mehta P, Kalyanpur T, Narsinghpura K, Krishnan R, Raja D, Yadav M, Cherian M. Outcomes of Endovascular Coiling in Patients with Intracranial Aneurysms Presenting with Poor Clinical and SAH Grade. Neuroradiol J 2011; 24:669-76. [DOI: 10.1177/197140091102400502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Accepted: 01/23/2011] [Indexed: 11/16/2022] Open
Abstract
Although the treatment of intracranial aneurysms has made significant advances, prediction of outcomes in poor grades has always been difficult. We present our findings of patients in poor clinical and SAH grade treated with endovascular coiling. We aimed to evaluate the clinical outcomes in patients presenting with poorer neurological and SAH grades treated by endovascular techniques. Of 190 patients who presented with SAH over a period of nine years, 34 were of poorer clinical grade (Hunt & Hess Grades 4 and 5), of whom 30 presented with H&H grade 4 and four with grade 5. 44.1% of the 34 patients belonged to Fischer grade 4. We assessed the technical success and final outcomes based on the Glasgow outcome scale. Of the 30 patients with grade 4, 81.4% had a good outcome. Two out of four patients with grade 5 had a poor outcome. 82.5% of the patients with Fischer grade 4 had a good outcome. None of the poor outcomes were procedure-related. Endovascular treatment with its higher rates of technical success, lower complication rates and better outcomes should be recommended as the treatment of choice in patients with intracranial aneurysms even in patients with poorer clinical and SAH grades.
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Sharma JK, Yadav M, Singh NP, Yadav KDS. Purification and characterisation of lignin peroxidase from Pycnoporus sanguineus MTCC-137. APPL BIOCHEM MICRO+ 2011. [DOI: 10.1134/s0003683811050139] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sharma JK, Yadav M, Singh NP, Yadav KDS. Purification and characterisation of lignin peroxidase from Pycnoporus sanguineus MTCC-137. PRIKLADNAIA BIOKHIMIIA I MIKROBIOLOGIIA 2011; 47:584-589. [PMID: 22232901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Extracellular secretion of lignin peroxidase from Pycnoporus sanguineus MTCC-137 in the liquid culture growth medium amended with lignin containing natural sources has been shown. The maximum secretion of lignin peroxidase has been found in the presence of saw dust. The enzyme has been purified to homogeneity from the culture filtrate of the fungus using ultrafiltration and anion exchange chromatography on DEAE-cellulose. The purified lignin peroxidase gave a single protein band in sodium dodecylsulphate polyacrylamide gel electrophoresis corresponding to the molecular mass 40 kDa. The K(m)(, kcat) and k(cat)/K(m) values of the enzyme using veratryl alcohol and H2O2 as the substrate were 61 microM, 2.13 s(-1), 3.5 x 10(4) M(-1) s(-1) and 71 microM, 2.13 s(-1), 3.0 x 10(4) M(-1) s(-1) respectively at the optimum pH of 2.5. The temperature optimum of the enzyme was 25 degrees C.
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Yadav M, Singh SK, Sharma JK, Yadav KDS. Oxidation of polyaromatic hydrocarbons in systems containing water miscible organic solvents by the lignin peroxidase of Gleophyllum striatum MTCC-1117. ENVIRONMENTAL TECHNOLOGY 2011; 32:1287-1294. [PMID: 21970171 DOI: 10.1080/09593330.2010.535177] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Lignin peroxidase has been purified to homogeneity using a process of concentration by ultrafiltration and anion exchange chromatography on diethylaminoethyl (DEAE) cellulose from the liquid culture filtrate of the brown rot fungi Gleophyllum striatum MTCC-1117. The molecular mass of the purified enzyme is 43 kDa as determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis. The K(m) values for the enzyme using veratryl alcohol, hydrogen peroxide and n-propanol were 66 microM, 82 microM and 476 microM, respectively. The pH and temperature optima of the enzyme were 2.8 and 25 degrees C, respectively. The enzyme is completely inhibited by 20% of the water miscible organic solvents acetone dioxane, diethylether, acetonitrile and dimethylformamide. The lignin peroxidase oxidizes polycyclic aromatic hydrocarbons pyrene, acenaphthene, anthracene, dibenothiophene and 9-methyl anthracene.
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Yadav M, Patel C, Patel M, Mishra T, Singhal P, Shrivastav PS, Yadav M, Baxi GA. Development and Validation of a Sensitive and Rapid Method to Determine Naratriptan in Human Plasma by LC-ESI-MS-MS: Application to a Bioequivalence Study. J Chromatogr Sci 2011; 49:101-7. [DOI: 10.1093/chrsci/49.2.101] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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99
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Yadav M, Rao R, Kurani H, Rathod J, Patel R, Singhal P, Shrivastav PS. Validated Ultra-Performance Liquid Chromatography Tandem Mass Spectrometry Method for the Determination of Pramipexole in Human Plasma. J Chromatogr Sci 2010; 48:811-8. [DOI: 10.1093/chromsci/48.10.811] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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100
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Yadav M, Singhal P, Goswami S, Pande UC, Sanyal M, Shrivastav PS. Selective Determination of Antiretroviral Agents Tenofovir, Emtricitabine, and Lamivudine in Human Plasma by a LC-MS-MS Method for a Bioequivalence Study in Healthy Indian Subjects. J Chromatogr Sci 2010; 48:704-13. [DOI: 10.1093/chromsci/48.9.704] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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