LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 30

Search options

  1. Article ; Online: Plausible role of bacterial toxin-antitoxin system in persister cell formation and elimination.

    Paul, Prajita / Sahu, Bikash R / Suar, Mrutyunjay

    Molecular oral microbiology

    2019  Volume 34, Issue 3, Page(s) 97–107

    Abstract: Although, a large proportion of pathogenic bacteria gets eliminated from hosts after antibiotic treatment, a fraction of population confronts against such effects and undergoes growth arrest to form persisters. Persistence in bacteria is a dormant ... ...

    Abstract Although, a large proportion of pathogenic bacteria gets eliminated from hosts after antibiotic treatment, a fraction of population confronts against such effects and undergoes growth arrest to form persisters. Persistence in bacteria is a dormant physiological state where cells escape the effects of antimicrobials as well as other host immune defences without any genetic mutations. The state of dormancy is achieved through various complex phenomena and it is known that a gene pair named as toxin-antitoxin (TA) acts as a key player of persister cell formation where the toxin is activated either stochastically or after an environmental insult, thereby silencing the physiological processes. However, the controversial role of TA modules in persister cell formation has also been documented with reasonable clarity. Persisters may revert back from state of quiescence and regrow when conditions become favourable for their propagation. Therefore, the elimination of dormant bacteria is crucial, and currently, research interest is highly focussed on developing several antipersister strategies that may kill persister bacteria by targeting different molecules. It is worth examining these targets to develop appropriate therapeutic interventions against bacterial infections and it is believed that earmarking TA system can be a novel approach for resuscitation of persisters. In this review, we discussed the role of TA modules in mediating persistence with highlighting on the debatable issues regarding contribution of these modules in dormant bacteria formation. Furthermore, we discussed if these modules in bacteria can be targeted for successful elimination of dormant persister cells.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Bacteria/drug effects ; Toxin-Antitoxin Systems
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2019-05-02
    Publishing country Denmark
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2537726-7
    ISSN 2041-1014 ; 2041-1006
    ISSN (online) 2041-1014
    ISSN 2041-1006
    DOI 10.1111/omi.12258
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: C-reactive protein: A promising biomarker for poor prognosis in COVID-19 infection.

    Sahu, Bikash R / Kampa, Raj Kishor / Padhi, Archana / Panda, Aditya K

    Clinica chimica acta; international journal of clinical chemistry

    2020  Volume 509, Page(s) 91–94

    Abstract: Background: The novel coronavirus disease 2019 (COVID-19) first broke out in Wuhan, China, spread over 227 countries and caused approximately 0.3 million death worldwide. Several biomolecules have been explored for possible biomarkers for prognosis ... ...

    Abstract Background: The novel coronavirus disease 2019 (COVID-19) first broke out in Wuhan, China, spread over 227 countries and caused approximately 0.3 million death worldwide. Several biomolecules have been explored for possible biomarkers for prognosis outcome. Although increased C reactive protein (CRP) is associated with death due to COVID-19 infections, results from different populations remain inconsistent. For a conclusive result, the present meta-analysis was performed.
    Methods: We conducted a literature search in PubMed and Scopus database for the association of CRP concentration with COVID-19 disease outcomes. A total of 16 eligible studies were enrolled in the present analysis comprising of 1896 survivors and 849 non-survivors cases. Concentrations of CRP were compared and analyzed by a meta-analysis.
    Results: Egger's regression analysis (intercept = 0.04, P = 0.98, 95%CI = -5.48 to 5.58) and funnel plot revealed an absence of publication bias in the included studies. Due to the presence of significant heterogeneity across the studies (Q = 252.03, P
    Conclusions: Concentrations of CRP remained high in patients who died of COVID-19 infection and could be a promising biomarker for assessing disease lethality.
    MeSH term(s) Betacoronavirus ; Biomarkers/blood ; C-Reactive Protein/metabolism ; COVID-19 ; Cohort Studies ; Coronavirus Infections/blood ; Coronavirus Infections/diagnosis ; Coronavirus Infections/epidemiology ; Humans ; Pandemics ; Pneumonia, Viral/blood ; Pneumonia, Viral/diagnosis ; Pneumonia, Viral/epidemiology ; Prognosis ; SARS-CoV-2
    Chemical Substances Biomarkers ; C-Reactive Protein (9007-41-4)
    Keywords covid19
    Language English
    Publishing date 2020-06-05
    Publishing country Netherlands
    Document type Journal Article ; Meta-Analysis
    ZDB-ID 80228-1
    ISSN 1873-3492 ; 0009-8981
    ISSN (online) 1873-3492
    ISSN 0009-8981
    DOI 10.1016/j.cca.2020.06.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article: MRI Abnormalities of the Brain After Complex Febrile Seizures in Children.

    Das, Rakesh / Swain, Banashree / Sahoo, Chinmaya K / Jena, Pradeep K / Sahu, Bikash R / Soren, Narendra N / Das, Shantibhusan / Mohakud, Nirmal K

    Cureus

    2022  Volume 14, Issue 12, Page(s) e33084

    Abstract: Background Though simple febrile seizures do not cause significant and lasting neurological deficits, complex febrile seizures (CFS) can result in neurologic sequelae. Because CFS causes cortical focal injuries and other brain lesions, it needs to be ... ...

    Abstract Background Though simple febrile seizures do not cause significant and lasting neurological deficits, complex febrile seizures (CFS) can result in neurologic sequelae. Because CFS causes cortical focal injuries and other brain lesions, it needs to be evaluated. Objective The objective of this study was to evaluate the MRI brain changes in CFS, the incidence of seizures in children aged six months to five years, and their severity in relation to MRI findings of the brain. Methods In this observational study, 36 children aged six months to five years, having fever with seizure, and fulfilling the criteria of CFS were enrolled within 48 hours of the episode. Detailed clinical and neurological examinations were performed with MRI scans to find out the probable CNS lesions of CFS. Two radiologists separately evaluated all MRI brains. Results MRI lesions of the brain were found in 11 (30.56%) CFS patients. Generalized tonic-clonic seizures (GTCS) (n=31, 86.11%) were the most common type of seizure among CFS cases. Cortical focal hyperintensity (CFH) (42.1%) was the most common MRI presentation. Positive MRI findings were significantly associated with focal convulsions (n=5, 100%) as compared to GTCS cases (n=6, 19%) (p=0.001). Conclusions CFH is the most common abnormality in the MRI brain among CFS cases. CFS patients with focal seizures or prolonged seizures in 24 hours have higher abnormal neuroimaging findings. MRI should be considered a preferred investigatory tool for detecting CNS pathology in CFS cases. Follow-up studies are needed to determine the long-term outcomes of CNS lesions in children with CFS.
    Language English
    Publishing date 2022-12-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.33084
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: C-reactive protein

    Sahu, Bikash R. / Kampa, Raj Kishor / Padhi, Archana / Panda, Aditya K.

    Clinica Chimica Acta

    A promising biomarker for poor prognosis in COVID-19 infection

    2020  Volume 509, Page(s) 91–94

    Keywords Clinical Biochemistry ; Biochemistry ; Biochemistry, medical ; General Medicine ; covid19
    Language English
    Publisher Elsevier BV
    Publishing country us
    Document type Article ; Online
    ZDB-ID 80228-1
    ISSN 1873-3492 ; 0009-8981
    ISSN (online) 1873-3492
    ISSN 0009-8981
    DOI 10.1016/j.cca.2020.06.013
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: Vaccine development for enteric bacterial pathogens: Where do we stand?

    Das, Susmita / Mohakud, Nirmal K / Suar, Mrutyunjay / Sahu, Bikash R

    Pathogens and disease

    2018  Volume 76, Issue 5

    Abstract: Gut infections triggered by pathogenic bacteria lead to most frequently occurring diarrhea in humans accounting for million deaths annually. Currently, only a few licensed vaccines are available against these pathogens for mostly travelers moving to ... ...

    Abstract Gut infections triggered by pathogenic bacteria lead to most frequently occurring diarrhea in humans accounting for million deaths annually. Currently, only a few licensed vaccines are available against these pathogens for mostly travelers moving to diarrheal endemic areas. Besides commercialized vaccines, there are many formulations that are either under clinical or pre-clinical stages of development and despite several efforts to improve safety, immunogenicity and efficacy, none of them can confer long-term protective immunity, for which repeated booster doses are always recommended. Further in many countries, financial, social and political constraints have jeopardized vaccine development program against these pathogens that enforce us to gather knowledge on safety, tolerability, immunogenicity and protective efficacy regarding the same. In this review, we analyze safety and efficacy issues of vaccines against five major gut bacteria causing enteric infections. The article also simultaneously describes several barriers for vaccine development and further discusses possible strategies to enhance immunogenicity and efficacy.
    MeSH term(s) Bacterial Vaccines/adverse effects ; Bacterial Vaccines/immunology ; Bacterial Vaccines/isolation & purification ; Cholera/prevention & control ; Drug Development/trends ; Enterobacteriaceae Infections/prevention & control ; Humans
    Chemical Substances Bacterial Vaccines
    Language English
    Publishing date 2018-08-29
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2049-632X
    ISSN (online) 2049-632X
    DOI 10.1093/femspd/fty057
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: C-reactive protein: A promising biomarker for poor prognosis in COVID-19 infection

    Sahu, Bikash R / Kampa, Raj Kishor / Padhi, Archana / Panda, Aditya K

    Clin Chim Acta

    Abstract: BACKGROUND: The novel coronavirus disease 2019 (COVID-19) first broke out in Wuhan, China, spread over 227 countries and caused approximately 0.3 million death worldwide. Several biomolecules have been explored for possible biomarkers for prognosis ... ...

    Abstract BACKGROUND: The novel coronavirus disease 2019 (COVID-19) first broke out in Wuhan, China, spread over 227 countries and caused approximately 0.3 million death worldwide. Several biomolecules have been explored for possible biomarkers for prognosis outcome. Although increased C reactive protein (CRP) is associated with death due to COVID-19 infections, results from different populations remain inconsistent. For a conclusive result, the present meta-analysis was performed. METHODS: We conducted a literature search in PubMed and Scopus database for the association of CRP concentration with COVID-19 disease outcomes. A total of 16 eligible studies were enrolled in the present analysis comprising of 1896 survivors and 849 non-survivors cases. Concentrations of CRP were compared and analyzed by a meta-analysis. RESULTS: Egger's regression analysis (intercept = 0.04, P = 0.98, 95%CI = -5.48 to 5.58) and funnel plot revealed an absence of publication bias in the included studies. Due to the presence of significant heterogeneity across the studies (Q = 252.03, Pheterogeneity = 0.000, I2 = 93.65) random model was used for the analysis of the present study. The results of the meta-analysis demonstrated a significant role of CRP in COVID-19 infection outcome (Standard difference in means = 1.371, P = 0.000). CONCLUSIONS: Concentrations of CRP remained high in patients who died of COVID-19 infection and could be a promising biomarker for assessing disease lethality.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #549009
    Database COVID19

    Kategorien

  7. Article ; Online: Redefining Lobe-Wise Ground-Glass Opacity in COVID-19 Through Deep Learning and its Correlation With Biochemical Parameters.

    Baral, Budhadev / Muduli, Kartik / Jakhmola, Shweta / Indari, Omkar / Jangir, Jatin / Rashid, Ashraf Haroon / Jain, Suchita / Mohapatra, Amrut Kumar / Patro, Shubhransu / Parida, Preetinanda / Misra, Namrata / Mohanty, Ambika Prasad / Sahu, Bikash R / Jain, Ajay Kumar / Elangovan, Selvakumar / Parmar, Hamendra Singh / Tanveer, M / Mohakud, Nirmal Kumar / Jha, Hem Chandra

    IEEE journal of biomedical and health informatics

    2023  Volume 27, Issue 6, Page(s) 2782–2793

    Abstract: During COVID-19 pandemic qRT-PCR, CT scans and biochemical parameters were studied to understand the patients' physiological changes and disease progression. There is a lack of clear understanding of the correlation of lung inflammation with biochemical ... ...

    Abstract During COVID-19 pandemic qRT-PCR, CT scans and biochemical parameters were studied to understand the patients' physiological changes and disease progression. There is a lack of clear understanding of the correlation of lung inflammation with biochemical parameters available. Among the 1136 patients studied, C-reactive-protein (CRP) is the most critical parameter for classifying symptomatic and asymptomatic groups. Elevated CRP is corroborated with increased D-dimer, Gamma-glutamyl-transferase (GGT), and urea levels in COVID-19 patients. To overcome the limitations of manual chest CT scoring system, we segmented the lungs and detected ground-glass-opacity (GGO) in specific lobes from 2D CT images by 2D U-Net-based deep learning (DL) approach. Our method shows accuracy, compared to the manual method (  ∼ 80%), which is subjected to the radiologist's experience. We determined a positive correlation of GGO in the right upper-middle (0.34) and lower (0.26) lobe with D-dimer. However, a modest correlation was observed with CRP, ferritin and other studied parameters. The final Dice Coefficient (or the F1 score) and Intersection-Over-Union for testing accuracy are 95.44% and 91.95%, respectively. This study can help reduce the burden and manual bias besides increasing the accuracy of GGO scoring. Further study on geographically diverse large populations may help to understand the association of the biochemical parameters and pattern of GGO in lung lobes with different SARS-CoV-2 Variants of Concern's disease pathogenesis in these populations.
    MeSH term(s) Humans ; COVID-19/diagnostic imaging ; SARS-CoV-2 ; Deep Learning ; Pandemics ; Retrospective Studies ; Lung/diagnostic imaging
    Language English
    Publishing date 2023-06-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2695320-1
    ISSN 2168-2208 ; 2168-2194
    ISSN (online) 2168-2208
    ISSN 2168-2194
    DOI 10.1109/JBHI.2023.3263431
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Molecular insight to influential role of Hha-TomB toxin-antitoxin system for antibacterial activity of biogenic silver nanoparticles.

    Paul, Prajita / Verma, SureshK / Kumar Panda, Pritam / Jaiswal, Sangeeta / Sahu, Bikash R / Suar, Mrutyunjay

    Artificial cells, nanomedicine, and biotechnology

    2018  Volume 46, Issue sup3, Page(s) S572–S584

    Abstract: Emergence of silver nanoparticles (AgNPs) as a potent antibacterial agent for clinical application has raised attention towards its mode of action and needs detailed understanding of the mechanism. The current study investigates the influential role of ... ...

    Abstract Emergence of silver nanoparticles (AgNPs) as a potent antibacterial agent for clinical application has raised attention towards its mode of action and needs detailed understanding of the mechanism. The current study investigates the influential role of Hha-TomB toxin-antitoxin system in determination of AgNPs antibacterial activity. AgNPs were synthesized by biogenic process using bacterial supernatant and were characterized for their physiochemical properties. Microbiological and computational assays like molecular docking, growth curve analysis, live/dead assay, oxidative stress and apoptosis assay were performed with wild type (WT) and mutants (Δhha, ΔtomB) strains treated with AgNPs for elucidation of mechanism. Stable AgNPs having size 30-40 nm and zeta potential -32 ± 09 mV were synthesized. AgNPs have shown significant antibacterial activity against S. typhimurium. Influential role of Hha-TomB TA proteins was observed in antibacterial effect by their altered expression level change in ROS level and programmed cell death. Molecular investigation elucidated the effect of AgNPs as consequence of their interaction with cellular proteins with different amino acids via hydrophobic interaction leading to alteration of cellular metabolic processes like ROS induction and apoptosis causing ultimate death. The study provided a detail illustration of Hha-TomB TA system influence on antibacterial mechanism of AgNPs for wide spectrum clinical application.
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Bacterial Proteins/chemistry ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Metal Nanoparticles/chemistry ; Molecular Docking Simulation ; Salmonella typhimurium/genetics ; Salmonella typhimurium/growth & development ; Silver/chemistry ; Silver/pharmacology ; Toxin-Antitoxin Systems
    Chemical Substances Anti-Bacterial Agents ; Bacterial Proteins ; Silver (3M4G523W1G)
    Language English
    Publishing date 2018-11-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2723095-8
    ISSN 2169-141X ; 2169-1401
    ISSN (online) 2169-141X
    ISSN 2169-1401
    DOI 10.1080/21691401.2018.1503598
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: The Hha-TomB toxin-antitoxin module in Salmonella enterica serovar Typhimurium limits its intracellular survival profile and regulates host immune response.

    Paul, Prajita / Patel, Paritosh / Verma, Suresh K / Mishra, Pragyan / Sahu, Bikash R / Panda, Pritam Kumar / Kushwaha, Gajraj Singh / Senapati, Shantibhusan / Misra, Namrata / Suar, Mrutyunjay

    Cell biology and toxicology

    2021  Volume 38, Issue 1, Page(s) 111–127

    Abstract: The key to bacterial virulence relies on an exquisite balance of signals between microbe and hosts. Bacterial toxin-antitoxin (TA) system is known to play a vital role in response to stress adaptation, drug resistance, biofilm formation, intracellular ... ...

    Abstract The key to bacterial virulence relies on an exquisite balance of signals between microbe and hosts. Bacterial toxin-antitoxin (TA) system is known to play a vital role in response to stress adaptation, drug resistance, biofilm formation, intracellular survival, persistence as well as pathogenesis. In the present study, we investigated the role of Hha-TomB TA system in regulating virulence of Salmonella enterica serovar Typhimurium (S. Typhimurium) in a host model system, where we showed that deletion of hha and tomB genes displayed impaired cell adhesion, invasion, and uptake. The isogenic hha and tomB mutant strain was also found to be deficient in intracellular replication in vitro, with a highly repressed Salmonella Pathogenicity Island-2 (SPI-2) genes and downregulation of Salmonella Pathogenicity Island-1 (SPI-1) genes. In addition, the Δhha and ΔtomB did not show acute colitis in C57BL/6 mice and displayed less dissemination to systemic organs followed by their cecal pathology. The TA mutants also showed reduction in serum cytokine and nitric oxide levels both in vitro and in vivo. However, the inflammation phenotype was restored on complementing strain of TA gene to its mutant strain. In silico studies depicted firm interaction of Hha-TomB complex and the regulatory proteins, namely, SsrA, SsrB, PhoP, and PhoQ. Overall, we demonstrate that this study of Hha-TomB TA system is one of the prime regulating networks essential for S. Typhimurium pathogenesis. 1. Role of Hha-TomB toxin-antitoxin (TA) system in Salmonella pathogenesis was examined. 2. The TA mutants resulted in impaired invasion and intracellular replication in vitro. 3. The TA mutants displayed alteration in SPI-1 and SPI-2 regulatory genes inside host cells. 4. Mutation in TA genes also limited systemic colonization and inflammatory response in vivo.
    MeSH term(s) Animals ; Antitoxins/genetics ; Antitoxins/metabolism ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Gene Expression Regulation, Bacterial ; Immunity ; Mice ; Mice, Inbred C57BL ; Salmonella typhimurium/genetics ; Salmonella typhimurium/metabolism ; Serogroup
    Chemical Substances Antitoxins ; Bacterial Proteins
    Language English
    Publishing date 2021-03-02
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 48824-0
    ISSN 1573-6822 ; 0742-2091
    ISSN (online) 1573-6822
    ISSN 0742-2091
    DOI 10.1007/s10565-021-09587-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Vaccine development for enteric bacterial pathogens: Where do we stand?

    Das, Susmita / Mohakud, Nirmal K / Suar, Mrutyunjay / Sahu, Bikash R

    Pathogens and disease. 2018 June 20, v. 76, no. 5

    2018  

    Abstract: Gut infections triggered by pathogenic bacteria lead to most frequently occurring diarrhea in humans accounting for million deaths annually. Currently, only a few licensed vaccines are available against these pathogens for mostly travelers moving to ... ...

    Abstract Gut infections triggered by pathogenic bacteria lead to most frequently occurring diarrhea in humans accounting for million deaths annually. Currently, only a few licensed vaccines are available against these pathogens for mostly travelers moving to diarrheal endemic areas. Besides commercialized vaccines, there are many formulations that are either under clinical or pre-clinical stages of development and despite several efforts to improve safety, immunogenicity and efficacy, none of them can confer long-term protective immunity, for which repeated booster doses are always recommended. Further in many countries, financial, social and political constraints have jeopardized vaccine development program against these pathogens that enforce us to gather knowledge on safety, tolerability, immunogenicity and protective efficacy regarding the same. In this review, we analyze safety and efficacy issues of vaccines against five major gut bacteria causing enteric infections. The article also simultaneously describes several barriers for vaccine development and further discusses possible strategies to enhance immunogenicity and efficacy.
    Keywords commercialization ; developmental stages ; diarrhea ; digestive system ; digestive system diseases ; humans ; immunogenicity ; intestinal microorganisms ; pathogens ; politics ; vaccine development ; vaccines ; virulent strains
    Language English
    Dates of publication 2018-0620
    Publishing place Oxford University Press
    Document type Article
    ISSN 2049-632X
    DOI 10.1093/femspd/fty057
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top