LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 31

Search options

  1. Article ; Online: Targeting the

    Shastry, Rajesh P / Abhinand, Chandran S

    Journal of biomolecular structure & dynamics

    2023  Volume 42, Issue 4, Page(s) 1956–1965

    Abstract: Quorum sensing plays a major role in the expression of virulence and development of biofilm in the human ... ...

    Abstract Quorum sensing plays a major role in the expression of virulence and development of biofilm in the human pathogen
    MeSH term(s) Humans ; Quorum Sensing ; Pseudomonas aeruginosa/genetics ; Virulence Factors/metabolism ; Molecular Docking Simulation ; Bacterial Proteins/metabolism ; Biofilms
    Chemical Substances Virulence Factors ; Bacterial Proteins
    Language English
    Publishing date 2023-04-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2023.2202270
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Exploring the complex role of gut microbiome in the development of precision medicine strategies for targeting microbial imbalance-induced colon cancer.

    Pal, Pamela / Shastry, Rajesh P

    Folia microbiologica

    2023  Volume 68, Issue 5, Page(s) 691–701

    Abstract: The gut microbiome has been increasingly recognized as a key player in the development and progression of colon cancer. Alterations in the gut microbiota, known as dysbiosis, can lead to a variety of medical issues. Microbial adaptation through signals ... ...

    Abstract The gut microbiome has been increasingly recognized as a key player in the development and progression of colon cancer. Alterations in the gut microbiota, known as dysbiosis, can lead to a variety of medical issues. Microbial adaptation through signals and small molecules can enhance pathogen colonization and modulate host immunity, significantly impacting disease progression. Quorum sensing peptides and molecules have been linked to the progression of colon cancer. Various interventions, such as fecal microbiota transplantation, probiotics, prebiotics, synbiotics, and antibiotics, have been used to reverse dysbiosis with mixed results and potential side effects. Thus, a personalized approach to treatment selection based on patient characteristics, such as individual gut microbiota manipulation, is necessary to prevent and treat diseases like colon cancer. With advances in metagenomic sequencing and other omics technologies, there has been a growing interest in developing precision medicine strategies for microbial imbalance-induced colon cancer. This review serves as a comprehensive synthesis of current knowledge on the gut microbiome involvement in colon cancer. By exploring the potential of utilizing the gut microbiome as a target for precision medicine, this review underscores the exciting opportunities that lie ahead. Although challenges exist, the integration of microbiome data into precision medicine approaches has the potential to revolutionize the management of colon cancer, providing patients with more personalized and effective treatment options.
    MeSH term(s) Humans ; Gastrointestinal Microbiome ; Precision Medicine/methods ; Dysbiosis/therapy ; Probiotics/therapeutic use ; Colonic Neoplasms/therapy
    Language English
    Publishing date 2023-08-25
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 240503-9
    ISSN 1874-9356 ; 0015-5632
    ISSN (online) 1874-9356
    ISSN 0015-5632
    DOI 10.1007/s12223-023-01085-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Correction to: Exploring the complex role of gut microbiome in the development of precision medicine strategies for targeting microbial imbalance-induced colon cancer.

    Pal, Pamela / Shastry, Rajesh P

    Folia microbiologica

    2023  Volume 68, Issue 6, Page(s) 1005

    Language English
    Publishing date 2023-09-21
    Publishing country United States
    Document type Published Erratum
    ZDB-ID 240503-9
    ISSN 1874-9356 ; 0015-5632
    ISSN (online) 1874-9356
    ISSN 0015-5632
    DOI 10.1007/s12223-023-01094-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Synergistic effects of COVID-19 and Pseudomonas aeruginosa in chronic obstructive pulmonary disease: a polymicrobial perspective.

    Bajire, Sukesh Kumar / Shastry, Rajesh P

    Molecular and cellular biochemistry

    2023  Volume 479, Issue 3, Page(s) 591–601

    Abstract: This article discusses the connection between the novel coronavirus disease 2019 (COVID-19) caused by the coronavirus-2 (SARS-CoV-2) and chronic obstructive pulmonary disease (COPD). COPD is a multifaceted respiratory illness that is typically observed ... ...

    Abstract This article discusses the connection between the novel coronavirus disease 2019 (COVID-19) caused by the coronavirus-2 (SARS-CoV-2) and chronic obstructive pulmonary disease (COPD). COPD is a multifaceted respiratory illness that is typically observed in individuals with chronic exposure to chemical irritants or severe lung damage caused by various pathogens, including SARS-CoV-2 and Pseudomonas aeruginosa. The pathogenesis of COPD is complex, involving a variety of genotypes and phenotypic characteristics that result in severe co-infections and a poor prognosis if not properly managed. We focus on the role of SARS-CoV-2 infection in severe COPD exacerbations in connection to P.  aeruginosa infection, covering pathogenesis, diagnosis, and therapy. This review also includes a thorough structural overview of COPD and recent developments in understanding its complicated and chronic nature. While COVID-19 is clearly linked to emphysema and chronic bronchitis at different stages of the disease, our understanding of the precise interaction between microbial infections during COPD, particularly with SARS-CoV-2 in the lungs, remains inadequate. Therefore, it is crucial to understand the host-pathogen relationship from the clinician's perspective in order to effectively manage COPD. This article aims to provide a comprehensive overview of the subject matter to assist clinicians in their efforts to improve the treatment and management of COPD, especially in light of the COVID-19 pandemic.
    MeSH term(s) Humans ; Pseudomonas aeruginosa ; COVID-19 ; Pandemics ; SARS-CoV-2 ; Pulmonary Disease, Chronic Obstructive/complications
    Language English
    Publishing date 2023-05-02
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 184833-1
    ISSN 1573-4919 ; 0300-8177
    ISSN (online) 1573-4919
    ISSN 0300-8177
    DOI 10.1007/s11010-023-04744-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Braided silk sutures coated with photoreduced silver nanoparticles for eradicating Staphylococcus aureus and Streptococcus mutans infections.

    Mathew, Shilpa / Vijaya Kumar, K / Prabhu, Ashwini / Shastry, Rajesh P / Rajesh, K S

    Journal of microbiological methods

    2024  Volume 220, Page(s) 106923

    Abstract: Background: Infections resulting from surgical procedures and wound closures continue to pose significant challenges in healthcare settings. To address this issue, the investigators have developed antibacterial non-resorbable braided silk sutures using ... ...

    Abstract Background: Infections resulting from surgical procedures and wound closures continue to pose significant challenges in healthcare settings. To address this issue, the investigators have developed antibacterial non-resorbable braided silk sutures using in situ deposited silver nanoparticles (AgNPs) and investigated their efficacy in eradicating Staphylococcus aureus and Streptococcus mutans infections.
    Methods: The braided silk sutures were modified through a simple and efficient in situ photoreduction method, resulting in the uniform distribution of AgNPs along the suture surface. The synthesized AgNPs were characterized using scanning electron microscopy (SEM), dynamic light scattering analysis (DLS) and Fourier Transform Infrared Spectroscopy analysis (FTIR) confirming their successful integration onto the silk sutures. The antibacterial activity of the nanoparticle coated sutures were compared and evaluated with non-coated braided silk sutures through in vitro assays against both S. aureus and S. mutans.
    Results: The surface and cross-sectional analysis of the treated sutures revealed a uniform and homogeneous distribution of silver particles achieved through the photoreduction of silver solution. This observation confirms the successful coating of silver nanoparticles (AgNPs) on the sutures. The antimicrobial studies conducted, demonstrated significant reductions in bacterial colonies when exposed to the silver nanoparticle-coated sutures. Notably, the width of the inhibition zone surrounding the coated sutures remained consistently wide and stable for duration up to 7 days. This sustained and robust inhibitory effect against gram-positive bacteria, specifically S. aureus and S. mutans, serves as strong evidence of the antibacterial efficacy of the coated sutures.
    Conclusion: The coating of silk sutures with AgNPs provided a significant and effective antibacterial capacity to the surgical sutures, with this activity being sustained for a period of 7 days. This suggests that AgNPs-in situ photoreduction deposited sutures have the potential to effectively manage S. aureus and S. mutans infections.
    MeSH term(s) Silver/chemistry ; Staphylococcus aureus ; Metal Nanoparticles/chemistry ; Streptococcus mutans ; Cross-Sectional Studies ; Sutures/microbiology ; Anti-Bacterial Agents/pharmacology ; Silk/chemistry ; Silk/pharmacology ; Microbial Sensitivity Tests ; Spectroscopy, Fourier Transform Infrared
    Chemical Substances Silver (3M4G523W1G) ; Anti-Bacterial Agents ; Silk
    Language English
    Publishing date 2024-03-22
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 604916-3
    ISSN 1872-8359 ; 0167-7012
    ISSN (online) 1872-8359
    ISSN 0167-7012
    DOI 10.1016/j.mimet.2024.106923
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: 3-(Bromoacetyl) coumarin is a potential therapeutic agent against neonatal sepsis-associated Pseudomonas extremorientalis.

    Banerjee, Shukla / Bajire, Sukesh Kumar / Mithun, H K / Shastry, Rajesh P

    Archives of microbiology

    2023  Volume 205, Issue 9, Page(s) 312

    Abstract: Neonatal sepsis is a severe bacterial infection that can lead to life-threatening complications in newborns. Pseudomonas extremorientalis is a Gram-negative bacterium and these Gram-negative organisms have been identified as a major cause of neonatal ... ...

    Abstract Neonatal sepsis is a severe bacterial infection that can lead to life-threatening complications in newborns. Pseudomonas extremorientalis is a Gram-negative bacterium and these Gram-negative organisms have been identified as a major cause of neonatal sepsis. The virulence factors produced by this bacterium play a crucial role in its pathogenicity. Therefore, targeting these virulence factors could be a potential strategy to treat neonatal sepsis caused by P. extremorientalis. In this study, we investigated the efficacy of 3-(bromoacetyl) coumarin (3-BC) in reducing the virulence factors of P. extremorientalis strains isolated from neonatal sepsis. Our results showed that 3-BC effectively reduced the production of various virulence factors, including protease, elastase, siderophore, and exopolysaccharide in these strains. Furthermore, at a concentration of 125 µg/ml, 3-BC also inhibited the biofilm formation ability of these strains in combination with ciprofloxacin. It was discovered that 3-BC was functionally effective in protecting C. elegans against bacterial infection. Moreover, the in vitro and in vivo outcomes were strongly correlated with docking studies of various activator proteins. Overall, our findings suggest that 3-BC could be a potential therapeutic agent for the treatment of neonatal sepsis caused by P. extremorientalis. Further studies are needed to explore the mechanism of action of 3-BC and its potential use in clinical settings.
    MeSH term(s) Infant, Newborn ; Humans ; Animals ; Neonatal Sepsis/drug therapy ; Caenorhabditis elegans ; Coumarins/pharmacology ; Coumarins/therapeutic use ; Serine Endopeptidases ; Virulence Factors
    Chemical Substances Coumarins ; Serine Endopeptidases (EC 3.4.21.-) ; Virulence Factors
    Language English
    Publishing date 2023-08-21
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 124824-8
    ISSN 1432-072X ; 0302-8933
    ISSN (online) 1432-072X
    ISSN 0302-8933
    DOI 10.1007/s00203-023-03653-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Bacterial cross talk with gut microbiome and its implications: a short review.

    Shastry, Rajesh P / Rekha, P D

    Folia microbiologica

    2020  Volume 66, Issue 1, Page(s) 15–24

    Abstract: Human gut microbiota exists in a complicated symbiotic relationship which postulates to impact health and disease conditions on the host. Interestingly, the gut microbiome shows different mechanisms to regulate host physiology and metabolism including ... ...

    Abstract Human gut microbiota exists in a complicated symbiotic relationship which postulates to impact health and disease conditions on the host. Interestingly, the gut microbiome shows different mechanisms to regulate host physiology and metabolism including cell-to-cell communications. But microbiota imbalance is characterized to change in the host normal functioning and lead to the development and progression of major human diseases. Therefore, the direct cross talk through the microbial metabolites or peptides suggests the evidence of host health and disease. Recent reports highlight the adaptation signals/small molecules promoting microbial colonization which allows modulating immunity of host and leads to pathogen colonization. Moreover, quorum sensing peptides are also evident in the involvement of host disease conditions. Here, we review the current understanding of the gut microbiota cross talk with mammalian cells through metabolites and peptides. These studies are providing insight into the prediction of signature molecules which significantly provide information for the understanding of the interaction for precision medicine applications.
    MeSH term(s) Animals ; Bacteria/growth & development ; Bacteria/metabolism ; Bacterial Physiological Phenomena ; Biomarkers/metabolism ; Dysbiosis/microbiology ; Dysbiosis/pathology ; Gastrointestinal Microbiome/physiology ; Humans ; Immunomodulation ; Quorum Sensing ; Signal Transduction
    Chemical Substances Biomarkers
    Language English
    Publishing date 2020-09-19
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 240503-9
    ISSN 1874-9356 ; 0015-5632
    ISSN (online) 1874-9356
    ISSN 0015-5632
    DOI 10.1007/s12223-020-00821-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Functional network analysis identifies multiple virulence and antibiotic resistance targets in Stenotrophomonas maltophilia.

    Pinto, Larina / Shastry, Rajesh P / Alva, Shivakiran / Rao, R Shyama Prasad / Ghate, Sudeep D

    Microbial pathogenesis

    2023  Volume 183, Page(s) 106314

    Abstract: Stenotrophomonas maltophilia, an emerging multidrug-resistant opportunistic bacterium in humans is of major concern for immunocompromised individuals for causing pneumonia and bloodborne infections. This bacterial pathogen is associated with a ... ...

    Abstract Stenotrophomonas maltophilia, an emerging multidrug-resistant opportunistic bacterium in humans is of major concern for immunocompromised individuals for causing pneumonia and bloodborne infections. This bacterial pathogen is associated with a considerable fatality/case ratio, with up to 100%, when presented as hemorrhagic fever. It is resistant to commonly used drugs as well as to antibiotic combinations. In-silico based functional network analysis is a key approach to get novel insights into virulence and resistance in pathogenic organisms. This study included the protein-protein interaction (PPI) network analysis of 150 specific genes identified for antibiotic resistance mechanism and virulence pathways. Eight proteins, namely, PilL, FliA, Smlt2260, Smlt2267, CheW, Smlt2318, CheZ, and FliM were identified as hub proteins. Further docking studies of 58 selected phytochemicals were performed against the identified hub proteins. Deoxytubulosine and corosolic acid were found to be potent inhibitors of hub proteins of pathogenic S. maltophilia based on protein-ligand interactive study. Further pharmacophore studies are warranted with these molecules to develop them as novel antibiotics against S. maltophilia.
    MeSH term(s) Humans ; Stenotrophomonas maltophilia/genetics ; Virulence/genetics ; Anti-Bacterial Agents/pharmacology ; Drug Resistance, Microbial ; Immunocompromised Host
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2023-08-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2023.106314
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: 7-Ethoxycoumarin rescued Caenorhabditis elegans from infection of COPD derived clinical isolate Pseudomonas aeruginosa through virulence and biofilm inhibition via targeting Rhl and Pqs quorum sensing systems.

    Bajire, Sukesh Kumar / Prabhu, Ashwini / Bhandary, Yashodhar P / Irfan, K M / Shastry, Rajesh P

    World journal of microbiology & biotechnology

    2023  Volume 39, Issue 8, Page(s) 208

    Abstract: Pseudomonas aeruginosa is an ambidextrous Gram-negative contagium with density convoluted network defined quorum sensing, which enables the persistent survival within the host environment, contributing to various lung related diseases including Chronic ... ...

    Abstract Pseudomonas aeruginosa is an ambidextrous Gram-negative contagium with density convoluted network defined quorum sensing, which enables the persistent survival within the host environment, contributing to various lung related diseases including Chronic Obstructive Pulmonary Disease (COPD). It is clear that P. aeruginosa is a powerful, exquisite pathogen that has adopted a variety of virulence properties through quorum sensing (QS) regulated phenomenon and that it dominates both in the development and exacerbations of COPD. Interestingly, 7-Ethoxycoumarin (7-EC), a compound that adequately mimics QS signaling molecule of P. aeruginosa, was introduced as part of the process of developing novel ways to treat the severe exacerbations. The results showed that, introduction of 7-EC significantly decreased exopolysaccharide-mediated biofilm development of strains isolated from COPD sputum, as evidenced by SEM analysis. Furthermore, 7-EC was able to modulate a variety of virulence factors and motility without subjecting planktonic cells to any selection pressure. Bacterial invasion assay revealed the potential activity of the 7-EC in preventing the active entry to A549 cells without causing any damage to the cells and found functionally active in protecting the C. elegans from P. aeruginosa infection and being non-toxic to the worms. Docking analysis was further proved that 7-EC to be the potential anti-QS compound competing specifically with Rhl and Pqs Systems. Therefore, 7-EC in the utilisation against the P. aeruginosa based infections, may open an avenue for the futuristic mechanistic study in chronic respiratory diseases and a initiator for the development of non-antibiotic based antibacterial therapy.
    MeSH term(s) Animals ; Quorum Sensing ; Virulence ; Pseudomonas aeruginosa ; Caenorhabditis elegans ; Biofilms ; Virulence Factors ; Pulmonary Disease, Chronic Obstructive ; Bacterial Proteins/pharmacology ; Anti-Bacterial Agents/pharmacology
    Chemical Substances 7-ethoxycoumarin (31005-02-4) ; Virulence Factors ; Bacterial Proteins ; Anti-Bacterial Agents
    Language English
    Publishing date 2023-05-26
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1499109-3
    ISSN 1573-0972 ; 0959-3993
    ISSN (online) 1573-0972
    ISSN 0959-3993
    DOI 10.1007/s11274-023-03655-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Genomic potential for exopolysaccharide production and differential polysaccharide degradation in closely related Alteromonas sp. PRIM-21 and Alteromonas fortis 1T

    Rekha, Punchappady Devasya / Shastry, Rajesh P. / Ḥamīd, Āṣif / Ghate, Sudeep D. / Arun, Ananthapadmanabha Bhagwath / Athmika, Nagaraj

    Antonie van Leeuwenhoek. 2023 Jan., v. 116, no. 1 p.39-51

    2023  

    Abstract: Members of the genus Alteromonas are widely distributed in diverse marine environments and are often associated with marine organisms. Their ability to produce exopolysaccharides (EPS) and depolymerize sulfated algal polysaccharides has provided ... ...

    Abstract Members of the genus Alteromonas are widely distributed in diverse marine environments and are often associated with marine organisms. Their ability to produce exopolysaccharides (EPS) and depolymerize sulfated algal polysaccharides has provided industrial importance to some species. Here, we describe the draft genome of an algae-associated strain namely, Alteromonas sp. PRIM-21 isolated from the southwest coast of India to understand the EPS biosynthetic pathways as well as polysaccharide depolymerization system in comparison to the closely related strain Alteromonas fortis 1ᵀ that shares 99.8% 16S rRNA gene sequence similarity. Whole-genome shotgun sequencing of Alteromonas sp. PRIM-21 yielded 50 contigs with a total length of 4,638,422 bp having 43.86% GC content. The resultant genome shared 95.9% OrthoANI value with A. fortis 1 ᵀ, and contained 4125 predicted protein-coding genes, 71 tRNA and 10 rRNA genes. Genes involved in Wzx/Wzy-, ABC transporter- and synthase-dependent pathways for EPS production and secretion were common in both Alteromonas sp. PRIM-21 and A. fortis 1ᵀ. However, the distribution of carbohydrate-active enzymes (CAZymes) was heterogeneous. The strain PRIM-21 harbored polysaccharide lyases for the degradation of alginate, ulvan, arabinogalactan and chondroitin. This was further validated from the culture-based assays using seven different polysaccharides. The depolymerizing ability of the bacteria may be useful in deriving nutrients from the biopolymers produced in the algal host while the EPS biosynthesis may provide additional advantages for life in the stressful marine environment. The results also highlight the genetic heterogeneity in terms of polysaccharide utilization among the closely related Alteromonas strains.
    Keywords Alteromonas ; algae ; alginates ; arabinogalactans ; biopolymers ; biosynthesis ; chondroitin ; coasts ; depolymerization ; exopolysaccharides ; genetic heterogeneity ; genome ; genomics ; lyases ; marine environment ; nucleotide sequences ; secretion ; sequence homology ; India
    Language English
    Dates of publication 2023-01
    Size p. 39-51.
    Publishing place Springer International Publishing
    Document type Article ; Online
    ZDB-ID 214861-4
    ISSN 1572-9699 ; 0003-6072
    ISSN (online) 1572-9699
    ISSN 0003-6072
    DOI 10.1007/s10482-022-01796-8
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top